CN118826433A - Frequency regulation method of switching power supply and frequency regulation system of switching power supply - Google Patents

Abstract

The present application discloses a frequency regulation method for a switching power supply and a frequency regulation system for a switching power supply, and belongs to the technical field of switching power supplies. The frequency regulation method for the switching power supply comprises: controlling the charge and discharge state of the target capacitor 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; when the charge and discharge state of the target capacitor is a discharge state, adjusting 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 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 frequency regulation method for the switching power supply of the present application can improve system stability and extend the service life of the equipment.

Description

Frequency regulation method of switching power supply and frequency regulation system of switching power supply

Technical Field

The present application belongs to the technical field of switching power supplies, and in particular relates to a frequency regulation method for a switching power supply and a frequency regulation system for a switching power supply.

Background Art

The pulse frequency modulation curve of the switching power supply changes the switching frequency according to different loads, which can effectively increase work efficiency. However, when the load is large, due to the influence of the power frequency ripple and the large ripple of the feedback voltage, when the switching cycle changes at a fast rate, it will cause the valley jump at the same load point, affecting the service life of the equipment. In the related technology, a two-to-one data selector is used to change the discharge current of the capacitor through the feedback voltage turning point, so that the switching cycle changes at different rates with the feedback voltage under different loads. However, due to the output jitter problem of the comparator, the turning points of the feedback voltage rise and fall are different, which affects the valley distribution under the full load range, affects the normal operation of the equipment, and thus affects the service life of the equipment.

Summary of the invention

The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a frequency regulation method and a frequency regulation system of a switching power supply, which adaptively adjusts the discharge rate of a target capacitor to achieve an adaptive change of the switching cycle with the speed of change of a sawtooth wave signal before and after a target turning point, thereby improving system stability and extending the service life of the equipment.

In a first aspect, the present application provides a method for adjusting the frequency of a switching power supply, the method comprising:

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, the on and off state of the power tube is controlled based on the sawtooth wave signal, the load voltage and the second electrical signal threshold.

According to the frequency regulation method of the switching power supply of the present application, the charge and discharge state of the target capacitor is controlled 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, and in the process of discharging 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 load voltage rise and fall caused by the delay of the two-choice data selector are different, affecting the valley distribution under the full load range. On this basis, the frequency of the switching power supply is regulated based on the turning point, and the frequency of the switching power supply can be adaptively changed based on the different loads, thereby realizing the adaptive transformation of the switching cycle before and after the turning point with the speed of change of the sawtooth wave signal, thereby improving the system stability and extending the service life of the equipment.

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 breakover voltage, adjusting the discharge current of the target capacitor to change the frequency of the switching power supply 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.

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:

Respectively obtain 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 discharging state include: a first charge and a first current or the operating parameters in the discharging state include: a second charge and a second current;

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, a first functional relationship between the sawtooth wave oscillation signal and the switching period is obtained;

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 oscillation 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.

According to the frequency regulation method of the switching power supply of the present application, when the charge and discharge state of the target capacitor is the discharge state, the on and off state of the power tube is controlled based on the sawtooth wave signal, the load voltage and the second electrical signal threshold, including:

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

When the load voltage is not greater than the second electrical signal threshold, the 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, the power tube is controlled to be turned on;

When the pulse frequency signal is at a low level, the power tube is controlled to be disconnected.

According to the frequency regulation method of the switching power supply of the present application, the charging and discharging state of the target capacitor is controlled 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, including:

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.

In a second aspect, the present application provides a frequency regulation system for a switching power supply based on the frequency regulation method for a switching power supply as described in the first aspect, the system comprising:

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 is connected to the pulse frequency modulation oscillator circuit and the turning point adjustment circuit respectively.

According to the frequency regulation system of the switching power supply of the present application, a pulse frequency modulation oscillator circuit is provided to effectively generate a sawtooth wave signal and its corresponding oscillation curve by controlling the charge and discharge state of the target capacitor; and a turning point regulation circuit is provided in connection with the pulse frequency modulation oscillator circuit to effectively regulate the discharge current before and after the initial turning voltage, thereby controlling the discharge time of the pulse frequency modulation oscillator circuit, so as to achieve different switching cycle and sawtooth wave signal slopes under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

In a third aspect, the present application provides a frequency adjustment device for a switching power supply, the device comprising:

A first processing module, configured to control a charge and discharge state of the target capacitor 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 includes: a charging state or a discharging state;

a second processing module, configured to adjust 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 when the charge and discharge state of the target capacitor is the discharge state;

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

According to the frequency regulating device of the switching power supply of the present application, the charge and discharge state of the target capacitor is controlled 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. In the process of discharging 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 load voltage rise and fall caused by the delay of the two-choice data selector are different, affecting the valley distribution under 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 based on the different loads, thereby realizing the adaptive transformation of the switching cycle before and after the turning point with the speed of change of the sawtooth wave signal, thereby improving the system stability and extending the service life of the equipment.

In a fourth aspect, the present application also provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction. When the processor executes the program or instruction, the frequency adjustment method of the switching power supply as described in the first aspect is implemented.

In a fifth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein 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.

In a sixth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the frequency regulation method of the switching power supply as described in the first aspect above is implemented.

In a seventh aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the frequency regulation method of the switching power supply as described in the first aspect above.

The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

The charge and discharge state of the target capacitor is controlled 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. In the process of discharging 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 load voltage rise and fall caused by the delay of the two-choice data selector are different, affecting the valley distribution under 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 based on the different loads, thereby achieving adaptive transformation of the switching cycle before and after the turning point with the speed of change of the sawtooth wave signal, thereby improving system stability and extending the service life of the equipment.

Furthermore, by setting up a pulse frequency modulation oscillator circuit, a sawtooth wave signal and its corresponding oscillation curve can be effectively generated by controlling the charge and discharge state of the target capacitor; and by setting up a turning point adjustment circuit connected to the pulse frequency modulation oscillator circuit, the discharge current before and after the initial turning voltage can be effectively adjusted, thereby controlling the discharge time of the pulse frequency modulation oscillator circuit, so as to achieve different switching cycle and sawtooth wave signal slopes under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

Furthermore, by setting up a turning point adjustment circuit, the discharge current of the target capacitor is adjusted based on the correlation between the sawtooth wave signal generated by the pulse frequency modulation oscillator circuit and the initial turning voltage, thereby adaptively adjusting the discharge time of the target capacitor. The structure is simple, easy to implement, and low in cost.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic flow chart of a frequency regulation method for a switching power supply provided in an embodiment of the present application;

FIG2 is a schematic diagram of a structure of a frequency regulation system of a switching power supply provided in an embodiment of the present application;

FIG3 is one of the principle schematic diagrams of the frequency regulation method of the switching power supply provided in an embodiment of the present application;

FIG4 is a second structural schematic diagram of the frequency regulation system of the switching power supply provided in an embodiment of the present application;

FIG5 is a second schematic diagram of the principle of the frequency regulation method of the switching power supply provided in an embodiment of the present application;

FIG6 is a third schematic diagram of the principle of the frequency regulation method of the switching power supply provided in an embodiment of the present application;

FIG. 7 is a fourth schematic diagram of the principle of the frequency regulation method of the switching power supply provided in an embodiment of the present application;

FIG8 is a fifth schematic diagram of the principle of the frequency regulation method of the switching power supply provided in an embodiment of the present application;

FIG9 is a schematic structural diagram of a frequency regulating device for a switching power supply provided in an embodiment of the present application;

FIG. 10 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

Reference numerals: pulse frequency modulation oscillator circuit 210; first current source 211; first switch tube 212;

First capacitor 213; first comparator 214; first logic control module 215; 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 ; a fifth inverter 215 - 6 ;

Turning point adjustment circuit 220; second switch tube 221; first amplifier 222; second current source 223;

A third current source 224; a fourth current source 225;

Pulse frequency modulation signal generating circuit 230; second comparator 231; third NOR gate 232;

A second set-reset flip-flop 233 ; a sixth inverter 234 ; and a one-to-two selector 240 .

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally indicates that the objects associated with each other are in an "or" relationship.

In combination with the accompanying drawings, the frequency regulation method of the switching power supply, the frequency regulation system of the switching power supply, the frequency regulation device of the switching power supply, the chip and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

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

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

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.

The frequency regulation method of the switching power supply provided in the embodiment of the present application can be executed by an electronic device or a functional module or functional entity in the electronic device that can implement the frequency regulation method of the switching power supply. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras and wearable devices. The frequency regulation method of the switching power supply provided in the embodiment of the present application is described below using the electronic device as an example of the execution subject.

As shown in FIG. 1 , the frequency adjustment method of the switching power supply includes: step 110 , step 120 and step 130 .

The frequency regulation method of the switching power supply can apply the frequency regulation system of the switching power supply shown in FIG. 2 .

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

The specific connection method of the frequency regulation system of the switching power supply is described in detail below and will not be elaborated here.

The frequency regulation method of a switching power supply can be applied to the field of pulse frequency regulation of a switching power supply.

Step 110, 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, control the charge and discharge state of the target capacitor; the charge and discharge state includes: a charging state or a discharging state;

In this step, the target capacitance is the capacitance that is charged and discharged in the circuit.

The leading edge blanking signal is a reset signal of the circuit where the sawtooth wave signal is generated. The leading edge blanking signal can be expressed as leb.

The leading edge blanking signal is determined based on the feedback voltage of the load.

In actual implementation, the leading edge blanking signal may be determined based on the sawtooth wave signal and a feedback voltage (FB) corresponding to the load.

The sawtooth wave signal is a signal generated by the target capacitor during the charging and discharging process, which can be expressed as Vsaw.

The leading edge blanking signal changes accordingly based on changes in the feedback voltage of the load.

It can be understood that when the voltage corresponding to the sawtooth wave signal is lower than the feedback voltage corresponding to the load, the leading edge blanking signal will change.

When the sawtooth wave signal is falling, the voltage corresponding to the sawtooth wave signal and the feedback voltage corresponding to the load can be compared. When 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 the cycle.

The frequency regulation system of the switching power supply starts the next charge and discharge cycle based on the IEB signal sent.

The working state is whether the target voltage is in a charging or discharging state or not in a charging or discharging state.

The first electrical signal threshold is a preset value for controlling the charging and discharging state of the target capacitor.

In the actual implementation process, the first electrical signal threshold is the feedback voltage value corresponding to the minimum switching period.

In the actual implementation 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.

In some embodiments, step 110 may further include:

When the leading edge blanking signal is at a low level, the target capacitor is controlled to be charged;

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.

In this embodiment, during the actual execution, 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.

When the sawtooth wave signal rises to a value greater than the first electrical signal threshold, the leading edge blanking signal changes to a high level, and at this time, the target capacitor is controlled to start discharging.

As shown in FIG. 2 , when the leading edge blanking signal is at a low level, PM0 is turned on, NM0 is turned off, and I0 charges C0 (ie, the target capacitor). At this time, the sawtooth wave signal gradually rises.

The sawtooth wave signal is used 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 CMP1 comparator outputs a high level, PM0 is disconnected, NM0 is turned on, and the first capacitor (i.e., the target capacitor) starts to discharge.

According to the frequency regulation method of the switching power supply provided in the embodiment of the present application, the charging of the target capacitor is controlled by a leading edge blanking signal. During the charging process, the relationship between the sawtooth wave signal and the first electrical signal threshold is continuously judged. When the sawtooth wave signal is greater than the first electrical signal threshold, the target capacitor is controlled to discharge. The control logic is simple and the operation is convenient.

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

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. The initial turning voltage can be expressed as VFB_turn.

The specific value of the initial transition voltage can be determined based on actual conditions and is not limited in this application.

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

Based on the size of the sawtooth wave signal and the initial turning voltage, the size of the discharge current of the target capacitor is adjusted to increase the discharge current when the sawtooth wave signal is large, so that the falling slope of the sawtooth wave signal increases, thereby shortening the switching period (that is, the slope of the switching period and the load voltage is flat), thereby changing the frequency of the switching power supply.

In 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. 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 correlations, the speed of the target capacitor discharge current can be adjusted.

Step 130 : When the charge and discharge state of the target capacitor is a discharge state, the on and off state of the power tube is controlled based on the sawtooth wave signal, the load voltage and the second electrical signal threshold.

In this step, the sawtooth wave signal is a sawtooth wave signal corresponding to the discharge current after the discharge current is adjusted.

It can be understood that the sawtooth wave signal changes based on changes in the discharge current.

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

The load voltage can be denoted as VFB.

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

In the actual implementation process, the power tube can be controlled to be turned on or off by adjusting the correlation between the voltage corresponding to the sawtooth wave signal, the load voltage and the second electrical signal threshold after adjusting the discharge current.

It can be understood that in actual application, 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, and the feedback voltage corresponding to the load moves up or down, which will cause the correlation between the feedback voltage corresponding to the load and the entire switching cycle to change, thereby obtaining the pulse frequency modulation curve shown in Figure 3.

It can be understood that by distinguishing the dTpfm/dVFB slope under light load and heavy load, that is, when the load is light, dTpfm/dVFB is larger, and Tpfm changes faster with VFB; when the load is heavy, dTpfm/dVFB is smaller, and Tpfm changes slower with VFB, thereby solving the valley jump problem caused by power frequency ripple under heavy load.

The frequency regulation method of the switching power supply can adjust the pulse frequency of the switching power supply by adjusting the discharge current in the discharge state and changing the discharge time.

According to the frequency regulation method of the switching power supply provided in the embodiment of the present application, the charge and discharge state of the target capacitor is controlled 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, and in the process of discharging 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 load voltage rise and fall caused by the delay of the two-choice data selector are different, affecting the valley distribution under the full load range. On this basis, the frequency of the switching power supply is regulated based on the turning point, and the frequency of the switching power supply can be adaptively changed based on the different loads, thereby realizing the adaptive transformation of the switching cycle before and after the turning point with the speed of change of the sawtooth wave signal, thereby improving the system stability and extending the service life of the equipment.

In some embodiments, step 130 may further include:

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, the power tube is controlled to be turned on;

When the pulse frequency signal is at a low level, the power tube is controlled to be disconnected.

In this embodiment, the pulse frequency signal is a signal for controlling the on/off state of the power tube.

The pulse frequency signal can be expressed as pfm.

As shown in FIG2 , in the actual implementation 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, thereby controlling the on/off state of the power tube based on the pulse signal frequency.

In actual implementation, the load voltage and the second electrical signal threshold may be compared by the two-to-one selector 240 , so that the two-to-one selector 240 outputs a relatively larger value of the load voltage and the second electrical signal threshold.

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

In the actual implementation 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 and discharge cycle to end early.

In the actual implementation process, when the load voltage is greater than the initial breakover voltage, the waveform of the sawtooth wave signal, the pulse frequency signal and the discharge period are shown in FIG6 .

In the actual implementation process, when the load voltage is not greater than the initial breakover voltage, the waveform of the sawtooth wave signal, the waveform of the pulse frequency signal and the discharge period are as shown in FIG. 7 .

When the two-to-one selector 240 determines that the load voltage is not greater than the second electrical signal threshold, the two-to-one selector 240 outputs the second electrical signal threshold to the comparator, and the comparator outputs the Vo2 signal based on the sawtooth wave signal and the second electrical signal threshold, thereby determining the pulse frequency signal.

In the actual implementation 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, so the waveform of the sawtooth wave signal, the waveform of the pulse frequency signal and the discharge cycle are as shown in Figure 8.

By comparing the updated sawtooth wave signal with the load voltage, the charge and discharge cycle is terminated in advance when the updated sawtooth wave signal is lower than the load voltage. The different slopes of the sawtooth wave signal before and after the initial turning point change the load voltage up and down in the time domain, thereby changing the entire switching cycle of the load to achieve a load-based switching frequency.

Continuing 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 will be used as the first input terminal of the NOR gate NOR3, and the pfm_chr signal will be used as the second input terminal of the NOR gate NOR3, which is used to ensure that the pfm signal is output as a high level only during the discharge time of the target capacitor C0. The NOR gate NOR3 outputs a set signal, which is a set signal of the RS trigger 2 composed of the NOR gates NOR4 and NOR5, and pfm_chr is a reset signal of the RS trigger 2. Finally, the set signal and the pfm_chr signal pass through the RS trigger 2 and the inverter INV6 to obtain the pfm signal.

According to the frequency regulation method of the switching power supply provided in the embodiment of the present application, by comparing the correlation between the sawtooth wave signal, the load voltage and the second electrical signal threshold, a pulse frequency signal is effectively obtained, thereby controlling the conduction or shutdown of the power tube based on the level of the pulse frequency signal, and the control logic is simple and easy to operate.

In some embodiments, step 120 may further include:

When the sawtooth wave signal is greater than the initial breakover voltage, the discharge current is adjusted 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.

In this embodiment, the first current is a current that controls the discharge rate of the target capacitor to increase after determining that the sawtooth wave signal is greater than the initial breakover voltage.

The second current is a 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.

Specific values of the first current and the second current may be determined based on the connection method of the circuit.

The first switching power supply frequency is a frequency determined based on the frequency adjustment system of the switching power supply operating at the operating parameters corresponding to the first current.

The second switching power supply frequency is a frequency determined based on the frequency adjustment system of the switching power supply operating at the operating parameters corresponding to the second current.

In the actual implementation process, when it is determined that the sawtooth wave signal is greater than the first electrical signal threshold, the target capacitor is controlled to start discharging, and during the discharging process, the correlation between the sawtooth wave signal and the initial turning voltage is further compared.

When the sawtooth wave signal is greater than the initial breakover voltage, the discharge rate of the target capacitor is increased and the discharge rate of the target capacitor is adjusted to the first current so as to control the power tube based on the first switching power supply frequency corresponding to the first current.

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

It can be understood that increasing the discharge rate of the target capacitance is to increase the discharge rate of the target capacitance on the basis of the discharge rate corresponding to the second current, that is, the discharge rate corresponding to the first current is greater than the discharge rate corresponding to the second current.

In the actual implementation process, different discharge currents have different operating parameters. Based on the operating parameters, the correlation between the switching cycle and each operating parameter can be determined.

The following describes the relationship between the switching cycle and various operating parameters under different discharge currents.

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

Respectively obtain the working parameters of the target capacitor in the charging state and the working parameters of the target capacitor in the discharging state at each acquisition time in the target charging and discharging cycle;

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, a first functional relationship between the sawtooth wave oscillation signal and the switching period is obtained;

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 oscillation 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. In this embodiment, the target charge and discharge cycle is the cycle length during the charge and discharge process of the target capacitor.

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

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.

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

The operating parameters in the charging state include: a third charge and a third current.

In the actual implementation process, during the charging and discharging process of the target capacitor, the working parameters of the circuit in each state are collected in real time, that is, the working parameters of the target capacitor in the charging state and the working parameters in the discharging state are collected in real time.

In some embodiments, obtaining the operating parameters of the target capacitor in the discharge state at each acquisition time in the target charge and discharge cycle may also include:

Acquire a first charge and a first current of the target capacitor when the target capacitor is discharged based on the first current;

A second charge and a second current of the target capacitor are obtained when the target capacitor is discharged based on the second current.

In this embodiment, the first charge is the charge amount corresponding to the target capacitor when the target capacitor is discharged at a discharge rate corresponding to the first current.

The second charge is the charge amount corresponding to the target capacitance when the target capacitance is discharged at a discharge rate corresponding to the second current.

The first current is a current value corresponding to a process in which the target capacitor is discharged with the first current.

The second current is a current value corresponding to a process in which the target capacitor is discharged with the second current.

In the actual implementation process, the first charge, the first current, the second charge and the second current of the target capacitor may be collected by using an instrument corresponding to working parameters such as a charge value and a current value.

Continuing to refer to FIG. 2 , when the sawtooth wave signal is greater than the initial breakover voltage, the current I2 is output, and I3 is obtained through current mirroring to obtain the first current.

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

Isink1＝I1+K*I2

Among them, 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.

When the sawtooth wave signal is not greater than the initial break voltage, the transconductance amplifier GM1 gradually turns off the current I2 according to the difference between the sawtooth wave signal and the initial break voltage until I2=0. At this time, I3=0, and a second current is obtained.

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

Isink2＝I1

Wherein, Isink2 is the second current, and I1 is the current corresponding to the second current source.

In the actual implementation process, after the first current and the second current are obtained, the discharge rates corresponding to the first current and the second current can be calculated.

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

Wherein, 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.

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

Wherein, 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.

According to the frequency regulation method of the switching power supply provided in the embodiment of the present application, by collecting the charge and current values of the target capacitor at different discharge rates, the operating parameters of the circuit are effectively obtained, providing data support for subsequent adaptive frequency regulation.

In some embodiments, obtaining the operating parameters of the target capacitor in the charging state at each acquisition time in the target charge and discharge cycle may also include:

A third current of the target capacitor in a charging state and a third charge of the target capacitor are obtained.

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

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

In the actual implementation process, the charge amount and current value of the target capacitor in the charging state are collected through instruments corresponding to working parameters such as the charge value and the current value.

According to the frequency adjustment method of the switching power supply provided in the embodiment of the present application, by collecting the charge 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.

In some embodiments, the target relationship may be determined based on the operating parameters in the charging state and the operating parameters in the discharging state;

In this embodiment, the target relationship is the relationship between the switching period and the voltage corresponding to the sawtooth wave signal.

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 can be calculated based on the obtained operating parameters corresponding to different discharge currents, so as to determine the target relationship based on the correlation.

The first functional relationship is a functional relationship 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.

The second functional relationship is a functional relationship 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.

In the actual implementation process, the first functional relationship can be determined based on the following formula:

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.

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

In the actual implementation process, the second functional relationship can be determined based on the following formula:

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.

After the first functional relationship and the second functional relationship are obtained, a pulse frequency modulation curve as shown in FIG. 3 may be determined based on the first functional relationship and the second functional relationship.

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

Among them, Tpfm is the switching cycle, Tpfm_ _chr is the charging cycle, Tpfm_ _dis is the discharging cycle, 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.

Based on the obtained first functional relationship and the 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, so that the frequency of the switching power supply can be changed subsequently based on the first switching power supply frequency and the second switching power supply frequency.

Based on the formula corresponding to the above switching cycle, 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 faster, while when the load is large (i.e. medium load), Vsaw＞VFB_turn, and the rate of change of Tpfm with Vsaw is slower, realizing the pulse frequency modulation curve as shown in Figure 3.

According to the frequency adjustment method of the switching power supply provided in the embodiment of the present application, by comparing the relationship between the sawtooth wave oscillation signal and the initial turning voltage during the discharge process, the discharge current before and after the initial turning voltage is adaptively adjusted, thereby adaptively adjusting the discharge rate of the target capacitor. The judgment logic is simple and the operation is convenient, thereby improving the efficiency of the discharge current adjustment.

As shown in FIG. 2 , an embodiment of the present application further provides a frequency regulation system for a switching power supply based on the frequency regulation method for a switching power supply as described in any of the above embodiments.

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.

In this embodiment, as shown in FIG. 4 , 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 leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold.

The PWM oscillator circuit 210 generates a sawtooth wave signal by controlling the charging and discharging state of the target capacitor.

The turning point adjustment circuit 220 is connected to the pulse frequency modulation oscillator circuit 210 .

The turning point adjustment circuit 220 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 point voltage in the target capacitor discharge state.

The processing module is connected to the pulse frequency modulation oscillator circuit 210 and the turning point adjustment circuit 220 respectively.

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

According to the frequency regulation system of the switching power supply provided in the embodiment of the present application, by setting a 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 a 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, thereby controlling the discharge time of the pulse frequency modulation oscillator circuit 210, so as to achieve different switching cycle and sawtooth wave signal slopes under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

Continuing to refer to FIG. 2 , in some embodiments, the pulse frequency modulation oscillator circuit 210 may further include: a first current source 211 , a first switch tube 212 , a first capacitor 213 , a first comparator 214 and a first logic control module 215 .

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

For example, as shown in FIG. 2 , the input terminal of the first power supply is connected to AVDD.

The source of the first switch tube 212 is connected to the output end of the first current source 211 .

An input terminal of the first capacitor 213 is connected to the drain of the first switch tube 212 .

An output terminal of the first capacitor 213 is grounded.

A positive input terminal of the first comparator 214 is connected to the drain of the first switch tube 212 .

A negative input terminal of the first comparator 214 is connected to the first electrical signal threshold.

In actual implementation, the first comparator 214 may be CMP1 in FIG. 2 .

An input terminal of the first logic control module 215 is connected to an output terminal of the first comparator 214 .

The output end of the first logic control module 215 is connected to the gate of the first switch tube 212 .

In some embodiments, the pulse frequency modulation oscillator circuit 210 may further include: a third switch tube.

In this embodiment, the source of the third switch tube is connected to the output end of the first capacitor 213 .

The drain of the third switch tube is connected to the drain of the first switch tube 212 .

The gate of the third switch tube is connected to the first reset signal.

The first reset signal may be denoted as lebb.

In the actual execution process, the lebb signal resets the sawtooth wave signal through the third switch tube, and the first current source 211 recharges the first capacitor 213, and the cycle repeats to generate a sawtooth wave signal.

According to the frequency regulation system of the switching power supply provided in the embodiment 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 state of the target capacitor is effectively controlled based on the output of the first comparator 214 and the first logic control module 215, and the control logic is simple and the operation is convenient.

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 .

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

An input terminal of the first reset-set flip-flop 215 - 2 is connected to an output terminal of the first inverter 215 - 1 and an output terminal of the first comparator 214 , respectively.

An input terminal of the second inverter 215 - 3 is connected to an output terminal of the first reset-set flip-flop 215 - 2 .

An input terminal of the third inverter 215 - 4 is connected to an output terminal of the second inverter 215 - 3 .

An output terminal of the third inverter 215 - 4 is connected to the gate of the first switch tube 212 .

An input terminal of the fourth inverter 215 - 5 is connected to an output terminal of the second inverter 215 - 3 .

An input terminal of the fifth inverter 215 - 6 is connected to an output terminal of the fourth inverter 215 - 5 .

The output terminal of the fifth inverter 215 - 6 outputs the first pulse frequency modulation signal.

In actual implementation, the charge and discharge state of the target capacitor may be controlled based on the leading edge blanking signal and the output of the first comparator 214 .

According to the frequency regulation method of the switching power supply provided in the embodiment of the present application, by setting the first logic control module 215, a logical judgment is effectively performed based on the leading edge blanking signal and the output of the first comparator 214, so as to control the conduction or disconnection of the first switch tube 212 based on the output result of the first logic control module 215, thereby controlling the charging and discharging state of the target capacitor.

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

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

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

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

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

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

According to the frequency regulation system of the switching power supply provided in the embodiment of the present application, by setting the first reset-set trigger 215-2 in the first logic control module 215, when a fault or error occurs in the frequency regulation system of the switching power supply, a reset signal is used to restore the entire system to an initial state, and by controlling the set and reset signals, the output state of the trigger is flexibly changed to achieve precise control of the circuit behavior and improve the stability of the system.

In some embodiments, the turning point adjustment circuit 220 may further include: a second switch tube 221 , a first amplifier 222 , a second current source 223 , a third current source 224 , and a fourth current source 225 .

In this embodiment, the drain of the second switch tube 221 is connected to the drain of the first switch tube 212 .

The gate of the second switch tube 221 is connected to the output end of the first logic control module 215 .

A positive input terminal of the first amplifier 222 is connected to the drain of the first switch tube 212 .

The negative input terminal of the first amplifier 222 is connected to the initial breakover voltage.

An input terminal of the second current source 223 is connected to the source of the second switch tube 221 .

An output terminal of the second current source 223 is grounded.

During the discharge of the target capacitor, the second current source 223 is in an on state.

An input terminal of the third current source 224 is connected to the output terminal of the first amplifier 222 .

An output terminal of the third current source 224 is grounded.

An input terminal of the fourth current source 225 is connected to the source of the second switch tube 221 .

An output terminal of the fourth current source 225 is grounded.

The fourth current source 225 is mirrored with the third current source 224 based on a target ratio.

For example, in the actual execution process, as shown in FIG2 , when the leading edge blanking signal is at a low level, pfm_chr=1, Vctr=0, the first switch tube 212 is turned on, the second switch tube 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.

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

Wherein, vsaw is a sawtooth wave signal, I0 is a third current, ie, a current corresponding to the first current source 211 , Tpfm_chr is a charging period, and Tpfm_chr is a third charge of the first capacitor 213 .

When the sawtooth wave signal is used as the positive input terminal of the first comparator 214CMP1 and compared with the first electrical signal threshold of the negative input terminal of CMP1, when the sawtooth wave signal is greater than the first electrical signal threshold, the output of the first comparator 214CMP1 is 1, and pfm_chr is output as a low level after passing through the first reset-set trigger 215-21 composed of the first NOR gate and the second NOR gate, the second inverter 215-3, the fourth inverter 215-5 and the fifth inverter 215-6. At the same time, Vctr=1, the first switch tube 212 is controlled to be disconnected, the second switch tube 221 is turned on, and the first capacitor 213 starts to discharge.

2 , during the discharge process, the turning point adjustment circuit 220 controls the discharge current of the first capacitor 213 .

When the sawtooth wave signal at the positive input terminal of the first amplifier 222 is greater than the initial turning voltage of 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 the current mirror to obtain the first current, which is the sum of the current corresponding to the second current source 223 and the current corresponding to the fourth current source 225.

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 is 0 and the fourth current source 225 is also 0, thereby obtaining a second current, which is the current corresponding to the second current source 223.

According to the frequency regulation system of the switching power supply provided in the embodiment of the present application, by setting the turning point adjustment circuit 220, the discharge 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, thereby adaptively adjusting the discharge time of the target capacitor. The structure is simple, easy to implement, and low in cost.

As shown in FIG. 4 , in some embodiments, the frequency regulation system of the switching power supply may further include: a pulse frequency modulation signal generating circuit 230 .

In this embodiment, the pulse frequency modulation signal generating circuit 230 controls the on and off of the power tube.

Continuing to refer to FIG. 2 , in some embodiments, the pulse frequency modulation signal generating 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 .

In this embodiment, the positive input terminal of the second comparator 231 is connected to the drain of the first switch tube 212 .

A negative input terminal of the second comparator 231 is connected to an output terminal of the one-out-of-two selector 240 .

The input end of the two-to-one selector 240 includes a first input port and a second input port.

The first input port is connected to the load voltage.

The second input port is connected to the second electrical signal threshold.

A first input port of the third NOR gate 232 is connected to the output terminal of the second comparator 231 .

A second input port of the third NOR gate 232 is connected to the first pulse frequency modulation signal, which can be represented as pfm_chr.

An input terminal of the second set-reset flip-flop 233 is connected to the output terminal of the third NOR gate 232 and the second input terminal of the third NOR gate 232 , respectively.

An input terminal of the sixth inverter 234 is connected to an output terminal of the second set-reset flip-flop 233 .

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

The first pulse frequency modulation signal is used to control the output pulse frequency signal to be high level when the first capacitor 213 is in a discharge state.

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

The reset signal and the first pulse frequency modulation signal are coupled to the second set-reset flip-flop 233 and the sixth inverter 234 to obtain a pulse frequency signal.

In the actual implementation process, when the sawtooth wave signal is greater than the second electrical signal threshold, the second comparator 231CMP2 as shown in FIG. 2 outputs Vo2=1, pfm=0, and at this time, the power tube can be controlled to be disconnected.

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

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

In the actual execution process, the waveform in the frequency regulation system of the switching power supply is shown in Figure 5, where leb is the leading edge blanking signal of DRV. When DRV is turned on, there is a shielding signal for t1 time, and the rest of the time is high level. The frequency regulation method of the switching power supply provided in the embodiment of the present application can be executed by a frequency regulation device of the switching power supply. In the embodiment of the present application, the frequency regulation device of the switching power supply performing the frequency regulation method of the switching power supply is taken as an example to illustrate the frequency regulation device of the switching power supply provided in the embodiment of the present application.

An embodiment of the present application also provides a frequency regulating device for a switching power supply.

As shown in FIG. 9 , the frequency regulating 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 .

The first processing module 910 is 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; the charge and discharge state includes: a charging state or a discharging state;

The second processing module 920 is used to adjust 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 when the charge and discharge state of the target capacitor is the discharge state;

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

According to the frequency regulation device of the switching power supply provided in the embodiment of the present application, the charge and discharge state of the target capacitor is controlled 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. In the process of discharging 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 load voltage rise and fall caused by the delay of the two-choice data selector are different, affecting the valley distribution under 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 based on the different loads, thereby realizing the adaptive transformation of the switching cycle before and after the turning point with the speed of change of the sawtooth wave signal, thereby improving the system stability and extending the service life of the equipment.

In some embodiments, the second processing module 920 may also be used to:

When the sawtooth wave signal is greater than the initial breakover voltage, the discharge current is adjusted 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.

In some embodiments, the second processing module 920 may also be used to:

Respectively obtain 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 discharging state include: a first charge and a first current or the operating parameters in the discharging state include: a second charge and a second current;

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, a first functional relationship between the sawtooth wave oscillation signal and the switching period is obtained;

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 oscillation 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.

In some embodiments, the third processing module 930 may also be used to:

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, the power tube is controlled to be turned on;

When the pulse frequency signal is at a low level, the power tube is controlled to be disconnected.

In some embodiments, the first processing module 910 may also be used to:

When the leading edge blanking signal is at a low level, the target capacitor is controlled to be charged;

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.

The frequency regulating device of the switching power supply in the embodiment of the present application may be a frequency regulating system of the switching power supply, or may be an electronic device that is connected to the frequency regulating system of the switching power supply in communication, or may be a component in the frequency regulating system of the switching power supply or the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than the terminal. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and may also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

The frequency regulating device of the switching power supply in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

The frequency regulation device of the switching power supply provided in the embodiment of the present application can implement the various processes implemented by the method embodiments of Figures 1, 3 and 5 to 8, and will not be described again here to avoid repetition.

In some embodiments, as shown in FIG10 , an embodiment of the present application further provides an electronic device 1000, comprising a processor 1001, a memory 1002, and a computer program stored in the memory 1002 and executable on the processor 1001. When the program is executed by the processor 1001, each process of the frequency regulation method embodiment of the above-mentioned switching power supply is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

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

The embodiment of the present application also 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 various processes of the frequency regulation method embodiment of the above-mentioned switching power supply are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

An embodiment of the present application further provides a computer program product, including a computer program, which implements the frequency adjustment method of the switching power supply when executed by a processor.

The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned switching power supply frequency adjustment method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the 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 reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the relevant technology, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims (12)

1. A method for adjusting the frequency of a switching power supply, comprising: 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, the on and off state of the power tube is controlled based on the sawtooth wave signal, the load voltage and the second electrical signal threshold. 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, 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 comprises: 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 method for adjusting the frequency of a switching power supply according to claim 1, wherein the frequency of the switching power supply is determined based on the following steps: Respectively obtain 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 discharging state include: a first charge and a first current or the operating parameters in the discharging state include: a second charge and a second current; 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, a first functional relationship between the sawtooth wave oscillation signal and the switching period is obtained; 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 oscillation 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 regulation 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, comprises: 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. The frequency regulation method of a switching power supply according to any one of claims 1 to 3, characterized in that the controlling the charge and discharge state of the target capacitor 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 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. 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 5, characterized in that it comprises: 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 is connected to the pulse frequency modulation oscillator circuit and the turning point adjustment circuit respectively. 7. The frequency regulation system of the switching power supply according to claim 6, 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. 8. The frequency regulation system of the switching power supply according to claim 7, characterized in that the first logic control module comprises: 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. 9. The frequency regulation system of the switching power supply according to claim 8, 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. 10. The frequency regulation system of the switching power supply according to claim 9, characterized in that the turning point regulation 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. 11. A chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, wherein 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 5 is implemented. 12. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein 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 5 is implemented.