CN119382507A

CN119382507A - Power supply feedback control circuit, switching power supply and electronic equipment

Info

Publication number: CN119382507A
Application number: CN202310919272.0A
Authority: CN
Inventors: 张贵臣; 李萍
Original assignee: Anker Innovations Co Ltd
Current assignee: Anker Innovations Co Ltd
Priority date: 2023-07-25
Filing date: 2023-07-25
Publication date: 2025-01-28
Also published as: WO2025021141A1

Abstract

The application relates to a power supply feedback control circuit, a switching power supply and electronic equipment. The power supply feedback control circuit is connected with the switching power supply module and comprises a voltage regulating controller and a voltage regulating circuit which are connected, and the voltage regulating circuit is connected with a feedback node of a feedback circuit of the switching power supply module. The voltage regulating controller is used for obtaining the target voltage of the target load and regulating the circuit state of the voltage regulating circuit based on the target voltage so as to regulate the voltage of the feedback node, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node. The power supply feedback control circuit is connected to the feedback nodes, so that the switch power supply modules of various resonant conversion topologies can be controlled to output corresponding voltages according to the requirements of electric equipment, a plurality of DC-DC conversion modules at the rear end of the resonant conversion topologies can be omitted, the circuit structure is simplified, the volume of the charging equipment is reduced, and the requirement of developing a fast-charging product to a small volume is met.

Description

Power supply feedback control circuit, switching power supply and electronic equipment

Technical Field

The present application relates to the field of circuit technologies, and in particular, to a power supply feedback control circuit, a switching power supply, and an electronic device.

Background

With the rapid development of consumer electronics, smart charges have been widely used in consumer electronics devices such as smart phones and tablet computers. Along with the continuous updating of the USB PD (Universal Serial Bus Power Delivery) standard, the quick charging power is larger and larger, and related quick charging products gradually develop to the directions of high frequency, small volume and high power density.

At present, various resonance transformation topologies are widely applied in intelligent fast-charging scenes. In a portable charging device or adapter, power conversion is achieved through various resonant conversion topologies. However, the voltage output by the resonance transformation topology is fixed, so that the rear end of the resonance transformation topology is also connected with a plurality of DC-DC (direct current-direct current) conversion modules in the portable charging equipment or the adapter so as to adapt to electric equipment with different voltage requirements, and the charging equipment has a complex structure and a large volume, and is difficult to meet the requirement of developing a fast-charging product to a small volume.

Disclosure of Invention

Based on this, it is necessary to provide a power supply feedback control circuit, a switching power supply, an electronic device, a power supply feedback control method, a power supply feedback control apparatus, a computer readable storage medium and a computer program product, which can control the switching power supply module to output a corresponding voltage according to the requirement of the electric device, and omit the DC-DC conversion module at the back end of the resonant conversion topology.

In a first aspect, the present application provides a power supply feedback control circuit. The power supply feedback control circuit is used for being connected with the switch power supply module and comprises a voltage regulating controller and a voltage regulating circuit which are connected, wherein the voltage regulating circuit is connected with a feedback node of a feedback circuit of the switch power supply module:

The voltage regulating controller is used for obtaining the target voltage of a target load, and adjusting the circuit state of the voltage regulating circuit based on the target voltage so as to adjust the voltage of the feedback node, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node.

In one embodiment, the voltage regulating controller adjusts the circuit state of the voltage regulating circuit to gradually change in the process of adjusting the circuit state of the voltage regulating circuit, so as to perform stepless regulation on the node voltage of the feedback node.

In one embodiment, the voltage regulating controller outputs a PWM signal to the regulating circuit for controlling the regulating circuit to change its equivalent resistance or current parameter.

In one embodiment, the voltage regulating circuit comprises a voltage dividing unit and a voltage regulating switch, one end of the voltage dividing unit is connected with a feedback node of a feedback circuit of the switching power supply module, the other end of the voltage dividing unit is grounded through the voltage regulating switch, and a controlled end of the voltage regulating switch is connected with the voltage regulating controller;

The voltage regulating controller is used for controlling the conduction time of the voltage regulating switch at a preset switching frequency to be gradually changed according to the target voltage, and adjusting the resistance state of the voltage dividing unit to be gradually changed so as to steplessly regulate the node voltage of the feedback node.

In one embodiment, the voltage regulating controller is configured to determine a preset switching frequency, an initial duty cycle and a target duty cycle of a PWM signal according to the target voltage, and output a PWM signal with a duty cycle gradually changed to the voltage regulating switch, where the duty cycle of the PWM signal is determined based on the initial duty cycle and the target duty cycle, and the frequency of the PWM signal is the preset switching frequency.

In one embodiment, the voltage regulating circuit comprises a controllable constant current source connected with the voltage regulating controller, and the controllable constant current source is connected with a feedback node of a feedback circuit of the switching power supply module;

The voltage regulating controller is used for controlling the current state of the controllable constant current source to be changed gradually according to the target voltage so as to carry out stepless regulation on the node voltage of the feedback node.

In one embodiment, the controllable constant current source comprises a voltage-to-current conversion unit, one end of the voltage-to-current conversion unit is connected with the voltage regulation controller, and the other end of the voltage-to-current conversion unit is connected with a feedback node of a feedback circuit of the switching power supply module;

the voltage regulating controller is used for outputting variable voltage which gradually changes to the voltage-to-current conversion unit according to the target voltage;

The voltage-to-current conversion unit is used for gradually changing the current state according to the variable voltage and the voltage of the feedback node.

In one embodiment, the controllable constant current source comprises a current mirror circuit, the input side of the current mirror circuit is connected with the voltage regulation controller, and the controlled side is connected with a feedback node of a feedback circuit of the switching power supply module;

the voltage regulating controller is used for outputting variable voltage which gradually changes to the current mirror circuit according to the target voltage;

the current mirror circuit is used for gradually changing the current state according to the variable voltage and the voltage of the feedback node.

In one embodiment, the controllable constant current source comprises an operational amplifier, a first resistor, a second resistor and an adjusting switch tube, wherein the non-inverting input end of the operational amplifier is connected with the voltage-regulating controller, the output end of the operational amplifier is connected with the base electrode of the adjusting switch tube through the first resistor, the collector electrode of the adjusting switch tube is connected with the feedback node of the feedback circuit of the switching power supply module, the emitter electrode of the adjusting switch tube is respectively connected with the inverting input end of the operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

In a second aspect, the application further provides a switching power supply. The switching power supply comprises a switching power supply module and the power supply feedback control circuit.

In one embodiment, the switching power supply module comprises a power conversion module, a feedback circuit connected with the power conversion module and a power supply controller respectively connected with the power conversion module and the feedback circuit;

The voltage regulating controller is used for acquiring a target voltage of a target load and adjusting the circuit state of the voltage regulating circuit based on the target voltage so as to adjust the voltage of the feedback node to a feedback voltage corresponding to the target voltage;

the feedback circuit is used for generating a feedback signal according to the feedback voltage and sending the feedback signal to the power supply controller;

the power supply controller is used for controlling the power conversion module according to the feedback signal so that the power conversion module outputs the target voltage.

In one embodiment, the voltage regulating controller is configured to adjust a circuit state of the voltage regulating circuit to be gradually changed based on the target voltage, so as to steplessly regulate the node voltage of the feedback node to the feedback voltage;

the feedback circuit is used for generating a feedback signal according to the node voltage of the feedback node, which gradually changes, and sending the feedback signal to the power supply controller;

The power supply controller is used for controlling the power conversion module according to the feedback signal so as to enable the output voltage of the power conversion module to gradually change to the target voltage.

In a third aspect, the application further provides electronic equipment. The electronic device comprises a switching power supply as described above.

In one embodiment, the electronic device is a charging device, the charging device includes an output interface, and the obtaining the target voltage of the target load includes obtaining a required charging voltage of the output interface to the device.

In a fourth aspect, the present application further provides a power supply feedback control method. The power supply feedback control method comprises the following steps:

acquiring a target voltage of a target load;

And adjusting the circuit state of the voltage regulating circuit based on the target voltage to adjust the voltage of a feedback node of a feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node.

In one embodiment, the adjusting the circuit state of the voltage adjusting circuit based on the target voltage to adjust the voltage of the feedback node of the switching power supply module includes:

and based on the target voltage, adjusting the circuit state of the voltage regulating circuit to gradually change so as to steplessly regulate the node voltage of the feedback node.

In a fifth aspect, the present application further provides a power supply feedback control device. The power supply feedback control device includes:

the voltage acquisition module is used for acquiring the target voltage of the target load;

And the adjusting module is used for adjusting the circuit state of the voltage regulating circuit based on the target voltage so as to adjust the voltage of a feedback node of a feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node.

In a sixth aspect, the present application also provides a computer readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:

acquiring a target voltage of a target load;

based on the target voltage, adjusting the circuit state of the voltage regulating circuit to adjust the voltage of a feedback node of a feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node

In a seventh aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:

acquiring a target voltage of a target load;

The power supply feedback control circuit is used for being connected with the switch power supply module and specifically comprises a voltage regulating controller and a voltage regulating circuit which are connected with feedback nodes of the feedback circuit of the switch power supply module, wherein the voltage regulating controller is used for acquiring target voltage of a target load and adjusting the circuit state of the voltage regulating circuit based on the target voltage so as to adjust the voltage of the feedback nodes, so that the switch power supply module outputs the target voltage according to the voltage of the feedback nodes. Therefore, the power supply feedback control circuit is connected to the feedback node of the switching power supply module, and the switching power supply module for controlling various resonant conversion topologies according to the requirements of electric equipment can output corresponding voltages, so that a plurality of DC-DC conversion modules at the rear end of the resonant conversion topology can be omitted, the circuit structure is greatly simplified, the volume of charging equipment can be reduced, and the requirement of developing a fast-charging product to a small volume is met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a block diagram of a power supply feedback control circuit according to one embodiment;

FIG. 2 is a block diagram of a power supply feedback control circuit and a switching power supply module in one embodiment;

FIG. 3 is a schematic circuit diagram of a topology of a power conversion module according to the related art;

FIG. 4 is a schematic diagram of a feedback circuit of a switching power module according to the related art;

FIG. 5 is a schematic diagram of a power supply feedback control circuit and feedback circuit connection in one embodiment;

FIG. 6a is an equivalent schematic diagram of the topology of the power conversion module of FIG. 3 in an operating state;

FIG. 6b is an equivalent schematic diagram of the topology of the power conversion module of FIG. 3 in another operating state;

FIG. 7 is a schematic diagram of various voltage waveforms obtained by performing an experiment according to the schematic diagram shown in FIG. 6;

FIG. 8 is a schematic diagram of current waveforms obtained by performing an experiment according to the schematic diagram shown in FIG. 6;

FIG. 9 is a schematic diagram of current and voltage waveforms from an experiment performed according to the schematic diagram of FIG. 6, in one embodiment;

FIG. 10 is a block diagram of a power supply feedback control circuit according to another embodiment;

FIG. 11 is a schematic diagram of a circuit structure of a voltage regulating circuit according to another embodiment;

FIG. 12 is a schematic diagram of a voltage regulating circuit according to another embodiment;

FIG. 13 is a schematic block diagram of a voltage regulating circuit according to yet another embodiment;

FIG. 14 is a schematic circuit diagram of a controllable constant current source in one embodiment;

FIG. 15 is a schematic diagram of a portion of a circuit of a voltage regulator controller in one embodiment;

FIG. 16 is a schematic circuit diagram of a controllable constant current source in another embodiment;

FIG. 17 is a schematic circuit diagram of a controllable constant current source according to yet another embodiment;

FIG. 18 is a flow chart of a power supply feedback control method according to an embodiment;

Fig. 19 is a block diagram showing a configuration of a power supply feedback control device in one embodiment.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.

In one embodiment, as shown in FIG. 1, a power supply feedback control circuit 100 is provided. The power supply feedback control circuit 100 is configured to be connected to the switching power supply module 200, and specifically includes a voltage regulator controller 110 and a voltage regulator circuit 120 that are connected to each other, where the voltage regulator circuit 120 is connected to a feedback node of a feedback circuit of the switching power supply module 200. The voltage regulator 110 is configured to obtain a target voltage of a target load, and adjust a circuit state of the voltage regulator circuit 120 based on the target voltage to adjust a voltage of a feedback node of a feedback circuit of the switching power supply module 200, so that the switching power supply module 200 outputs the target voltage according to the voltage of the feedback node.

The switching power supply module 200 is configured to convert an input voltage signal Vin into a stable dc voltage signal Vout, and a typical structure of the switching power supply module 200 is shown in fig. 2, and at least includes a power conversion module 210, a feedback circuit 220 connected to the power conversion module 210, and a power supply controller 230 connected to the power conversion module 210 and the feedback circuit 220, respectively. The feedback node of the feedback circuit 220 serves as the feedback node of the switching power supply module 200.

The topology of the power conversion module 210 may be, but not limited to, a forward converter, a flyback converter, a full-bridge converter, a half-bridge converter, an LLC converter, etc., for convenience in explaining the principle of the power conversion module 210, reference may be made to an asymmetric half-bridge flyback converter topology shown in fig. 3, where the topology includes an input filter capacitor Cin, a power tube Q1, a power tube Q2, a power tube Q3, an ideal transformer Tr, a resonant inductor Lr (which may be an independent inductor or a leakage inductance of a transformer), an excitation inductor Lm (the ideal transformer Tr, the resonant inductor Lr, and the excitation inductor Lm form an actual transformer model), a resonant capacitor Cr (the sign of which indicates a voltage polarity on the resonant capacitor Cr during steady-state operation), and an output filter capacitor Cout. In practical implementation, the power tube Q1, the power tube Q2 and the power tube Q3 are all connected to the power controller 230, and the power controller 230 controls the power conversion module 210 to process the input voltage Vin by adjusting the working states of the power tube Q1, the power tube Q2 and the power tube Q3, so as to obtain the output voltage Vout. The specific implementation of the power supply controller 230 is not limited and may be set by those skilled in the art with reference to a common technique in the art. For example, the power controller 230 may include a primary control unit connected to the power transistor Q1 and the power transistor Q2, respectively, and a secondary control unit connected to the power transistor Q3. In controlling the operation of the power conversion module 210, the primary control unit specifically controls the power tube Q1 and the power tube Q2, and the secondary control unit controls the power tube Q3.

A typical structure of the feedback circuit 220 is shown in fig. 4, and mainly includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, an optocoupler U1, and a reference voltage chip U2. One end of the resistor R1 is connected with the output voltage Vout, the other end of the resistor R1 is connected with the anode of the luminous tube of the optical coupler U1, the cathode of the luminous tube of the optical coupler U1 is connected with the cathode pin of the reference voltage chip U2, and the anode pin of the reference voltage chip U2 is grounded. One end of the resistor R4 is connected to the output voltage Vout, the other end of the resistor R4 is grounded through the resistor R5, and a connection point of the resistor R4 and the resistor R5 serves as a feedback node of the feedback circuit 220 and is connected with a reference pin of the reference voltage chip U2. One end of a capacitor C1 is connected with the luminous tube cathode of the optical coupler U1, the other end of the capacitor C2 is connected with the feedback node through a resistor R3, and the capacitor C2 is connected between the luminous tube cathode of the optical coupler U1 and the feedback node. The resistor R2 is used as a bypass resistor of the optical coupler U1 and is connected in parallel with two ends of the luminous tube of the optical coupler U1. The emitter of the triode of the optocoupler U1 is grounded, and the anode outputs a feedback signal FB to the power supply controller 230.

The resistors R4 and R5 are used for sampling the output voltage Vout to obtain a node voltage Vf of the feedback node, and the reference voltage chip U2 controls the voltage of the light emitting tube cathode of the optocoupler U1 according to the reference voltage and the node voltage Vf, so that the optocoupler U1 outputs a corresponding feedback signal FB, so that the power controller 230 receives the output state of the secondary power conversion module 210. The power controller 230 controls the output power of the power conversion module 210 to increase the output voltage Vout when determining that the output voltage decreases according to the feedback signal FB, and controls the output power of the power conversion module 210 to decrease the output voltage Vout when determining that the output voltage increases according to the feedback signal FB, thereby realizing the control of the power conversion module 210 to dynamically adjust the output voltage Vout to remain stable. The feedback circuit 220 may take other forms, not limited to that already mentioned in the embodiment of fig. 4, as long as it is capable of achieving the feedback function described above.

In this embodiment, the voltage regulator controller 110 is configured to obtain a target voltage of a target load. It can be understood that the target load is a device that needs to be powered by the output voltage Vout, such as a mobile phone, a tablet computer, and the like, and the type of the target load is not limited in this embodiment. The target voltage is the charging voltage required by the target load. The mode of the voltage regulation controller 110 for obtaining the target voltage of the target load is not limited, for example, the voltage regulation controller 110 may communicate with the target load to receive the power utilization protocol sent by the target load, so as to determine the target voltage, or the user may directly input the target voltage of the target load through the interaction module of the voltage regulation controller 110.

After determining the target voltage, the voltage regulator controller 110 adjusts the circuit state of the voltage regulator circuit 120 according to the target voltage, thereby implementing adjustment of the voltage of the feedback node of the switching power supply module 200. For convenience of explanation of the specific voltage regulation principle, the feedback circuit 220 is described below by taking the structure shown in fig. 4 as an example. As shown in fig. 5, in one embodiment, the voltage regulating circuit 120 is connected to a feedback node (a connection point between the resistor R4 and the resistor R5), and when the circuit state of the voltage regulating circuit 120 changes to a target state corresponding to the target voltage, the node voltage Vf of the feedback node also changes to a voltage value corresponding to the target voltage, and then the voltage value is fed back to the power controller 230 through the feedback signal FB, and the power controller 230 controls the power conversion module 210 to regulate the output voltage Vout to the target voltage.

The voltage regulator 110 may specifically adjust the circuit state of the voltage regulator circuit 120 to adjust the resistance state of the voltage regulator circuit 120, and it is understood that when the resistance state of the voltage regulator circuit 120 is changed, the voltage dividing states of the resistor R4 and the resistor R5 are changed, so as to change the node voltage Vf. The voltage regulator 110 may also adjust the current state of the voltage regulator 120 to change the voltage division result of the resistor R4 and the resistor R5, thereby changing the node voltage Vf.

The power supply feedback control circuit 100 includes a voltage regulator 110 and a voltage regulator circuit 120 connected to each other, where the voltage regulator circuit 120 is connected to a feedback node of the switching power supply module 200, and the voltage regulator 110 is configured to obtain a target voltage of a target load, and adjust a circuit state of the voltage regulator circuit 120 based on the target voltage to adjust a voltage of the feedback node of the switching power supply module 200, so that the switching power supply module 200 outputs the target voltage according to the voltage of the feedback node. By connecting the feedback node of the switching power supply module 200 to the power supply feedback control circuit 100, the switching power supply module 200 for controlling various resonant conversion topologies according to the requirements of electric equipment can output corresponding voltages, so that a plurality of DC-DC conversion modules at the rear end of the resonant conversion topology can be omitted, the circuit structure is greatly simplified, the volume of charging equipment can be reduced, and the requirement of developing a fast-charging product to a small volume is met.

In the process of adjusting the circuit state of the voltage adjusting circuit 120, the voltage adjusting controller 110 may directly and quickly switch the voltage adjusting circuit 120 from the current state to the target state, or gradually change the voltage adjusting circuit 120 from the current state until reaching the target state, and specifically, the adjustment mode may be determined according to the required switching time, the topology of the power conversion module 210 in the switching power supply module 200, and other specific conditions.

In one embodiment, the voltage regulator controller 110 adjusts the circuit state of the voltage regulator circuit 120 to gradually change during the process of adjusting the circuit state of the voltage regulator circuit 120, so as to perform stepless adjustment on the node voltage Vf of the feedback node.

It should be noted that, according to the different topology structures, when the voltage regulating circuit 120 is directly and quickly switched from the current state to the target state, the output voltage VOUT is also quickly switched to the target voltage, and in this process, a large impact current may be generated inside the power conversion module 210, which is easy to damage the power tube.

Specifically, referring to fig. 3 again, an asymmetric half-bridge flyback converter topology is still taken as an example, and a case where a large rush current may be generated inside the power conversion module 210 will be explained. The topological working process of the asymmetric half-bridge flyback converter is complex and is divided into a plurality of states, and for convenience of explanation, only two states are briefly explained temporarily. In order to be more easily understood, the topological schematic diagram of the asymmetric half-bridge flyback converter can be further equivalently processed, namely, the resistor is ignored when the power tube is conducted and is equivalent by a lead, the voltage of the resonance capacitor Cr is equivalent to the voltage source Vcr in a steady state, the turn ratio of the primary and secondary of the ideal transformer of the Tr is Nps, the output voltage is Vout, the output voltage Vout is converted to the voltage of the primary of the transformer Tr and is Nps times Vout, and therefore the equivalent output voltage of the voltage source Vr= Nps times Vout is converted to the voltage of the primary of the transformer Tr.

After the equivalent, the first state of the topology of the asymmetric half-bridge flyback converter is that the power tube Q1 is conducted, the power tube Q2 is cut off, and when the power tube Q3 is cut off, the ideal transformer Tr does not work because the power tube Q3 is cut off, the input voltage Vin charges the resonance capacitor Cr through the path of the power tube Q1-resonance inductor Lr-excitation inductor Lm-resonance capacitor Cr, and meanwhile, the excitation energy storage is carried out on the excitation inductor Lm, and the equivalent circuit is shown in figure 6 a.

The second state is that the power tube Q1 is cut off, the power tube Q2 is conducted, when the power tube Q3 is conducted, the ideal transformer Tr starts to transmit energy to the secondary side due to the conduction of the power tube Q3, the exciting inductance Lm is converted to the voltage Vr of the primary side of the transformer Tr by the output voltage Vout, the voltage Vcr on the resonant capacitor Cr is discharged to the resonant capacitor Cr through the exciting inductance Lm-the primary side (voltage Vr) of the transformer Tr-the resonant inductance Lr path, meanwhile, the exciting inductance Lm is demagnetized, and energy is transmitted to the secondary side, and the equivalent circuit is shown in fig. 6 b.

Referring to fig. 7, when the voltage regulating circuit 120 is switched from the current state to the target state directly and quickly, the output voltage Vout is also switched to the target voltage quickly, the voltage source vr= Nps ×vout, nps is a transformer turn ratio and is fixed, so when the output voltage Vout is switched, the voltage source Vr also changes along with the output voltage Vout according to the proportion Nps, but the capacitance voltage cannot be suddenly changed, and the constant voltage Vcr is unchanged. As can be seen from fig. 6b, when the voltages of the constant voltage source Vcr and the constant voltage source Vr are not equal, the voltage difference is applied to the resonant inductor Lr, and the impedance in the loop is small, so that an instantaneous large surge current is generated in the equivalent loop, as shown in fig. 8. The larger the pressure difference between the constant voltage source Vcr and the constant voltage source Vr is, the larger the impact current is, and the more components such as a power tube are easily damaged.

In this embodiment, the circuit state of the voltage regulating circuit 120 is gradually changed to steplessly regulate the node voltage Vf of the feedback node, so that the switching power module 200 correspondingly outputs the gradually changing output voltage Vout according to the gradually changing node voltage Vf until the output voltage Vout reaches the target voltage. Referring to fig. 9, in this process, stepless regulation of the output voltage Vout is achieved. Because the abrupt change of the output voltage Vout does not exist, the constant voltage source Vcr and the constant voltage source Vr are synchronously changed, the waveforms are identical, and no pressure difference exists between the constant voltage source Vcr and the constant voltage source Vr. Thus, the current in the loop transitions smoothly and no inrush current exists. Therefore, the current stress of the power tube is reduced, so that the switching power supply module 200 is safer and more reliable, and the failure rate of products is reduced.

In one embodiment, the voltage regulator controller 110 outputs a PWM signal to the regulator circuit 120 for controlling the regulator circuit 120 to change its equivalent resistance or current parameter.

Specifically, the voltage regulator controller 110 outputs a PWM signal to the regulator circuit 120, and controls the equivalent resistance or current parameter of the regulator circuit 120 by adjusting the duty ratio of the PWM signal. When the equivalent resistance of the regulating circuit 120 itself is changed, the voltage dividing states of the resistor R4 and the resistor R5 are changed, so that the node voltage Vf is changed, and when the current parameter of the regulating circuit 120 is changed, the magnitude of the node voltage Vf is also changed. It will be appreciated that the duty cycle of the PWM signal may be gradually changed as required as the duty cycle of the PWM signal is adjusted. Therefore, the voltage of the feedback node can be adjusted through the duty ratio adjustment of the PWM signal, and the output voltage is further adjusted.

In one embodiment, as shown in fig. 10, the voltage regulating circuit 120 includes a voltage dividing unit 121 and a voltage regulating switch 122, one end of the voltage dividing unit 121 is connected to a feedback node of a feedback circuit of the switching power supply module 200, the other end of the voltage dividing unit 121 is grounded through the voltage regulating switch 122, and a controlled end of the voltage regulating switch 122 is connected to the voltage regulating controller 110. The voltage regulating controller 110 is configured to control the on time of the voltage regulating switch 122 at a preset switching frequency to gradually change according to the target voltage, and adjust the resistance state of the voltage dividing unit 122 to gradually change, so as to perform stepless adjustment on the node voltage Vf of the feedback node.

The preset switching frequency is a frequency for controlling the voltage regulating switch 122 to switch the switching state, and when the preset switching frequency is set, the preset switching frequency can be set with reference to the parameter of the feedback circuit 220, or can be directly set to a larger frequency, so long as the switching frequency is far greater than the bandwidth of the feedback circuit 220 (for example, the switching frequency is 5-10 times of the bandwidth of the feedback loop), so as to avoid that the voltage dividing state of the voltage dividing unit 121 affects the stability of the feedback circuit 220 when the switching frequency of the voltage regulating switch 122 is small.

In this embodiment, by adjusting the on time of the voltage regulating switch 122 to gradually change at a constant preset switching frequency, the resistance state of the voltage dividing unit 121 connected to the feedback node is gradually changed, so as to steplessly adjust the node voltage Vf of the feedback node, thereby realizing stepless adjustment of the output voltage Vout.

The specific structures of the voltage dividing unit 121 and the voltage regulating switch 122 are not limited, as shown in fig. 11, in one embodiment, the voltage dividing unit 121 may include a resistor R6, the voltage regulating switch 122 may include a switch tube Q4, one end of the resistor R6 is connected to a feedback node, the other end of the resistor R6 is grounded through the switch tube Q4, and a controlled end of the switch tube Q4 is connected to the voltage regulating controller 110. The specific connection structure of the switching tube Q4 and the resistor R6 needs to be determined in combination with the specific selection of the switching tube Q4. For example, the switching transistor Q4 may be a transistor, a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), a Metal-Oxide semiconductor field effect transistor, or the like. The resistor R6 may be an independent resistor or an equivalent circuit formed by connecting a plurality of resistors, and is not particularly limited.

Accordingly, the voltage regulating controller 110 controls the on time of the switching tube Q4 at the preset switching frequency to gradually change according to the target voltage, so that the resistance state of the resistor R6 connected to the feedback node is gradually changed, so as to realize stepless adjustment of the node voltage Vf of the feedback node, and further realize stepless adjustment of the output voltage of the switching power supply module 200.

In one embodiment, the voltage regulation controller 110 determines a preset switching frequency, an initial duty ratio, and a target duty ratio of the PWM signal according to the target voltage, and outputs the PWM signal with the duty ratio gradually changed to the voltage regulation switch 122, wherein the duty ratio of the PWM signal is determined based on the initial duty ratio and the target duty ratio, and the frequency of the PWM signal is the preset switching frequency.

In the present embodiment, the voltage regulator controller 110 generates a PWM signal with a gradually changing duty ratio, and controls the on/off state of the voltage regulator switch 122 through the PWM signal. Specifically, after receiving the target voltage of the target load, the voltage regulator controller 110 may determine, according to the target voltage, a target resistance state to be connected to the feedback node, so as to determine, according to the current output voltage Vout of the switching power module 200 and the target voltage, a preset switching frequency, an initial duty cycle, and a target duty cycle of the PWM signal, where a determination manner of the preset switching frequency may be referred to the foregoing embodiment, which is not described in detail in this embodiment.

As for the method of determining the duty ratio of the PWM signal by the voltage regulator controller 110 according to the target voltage, the description will be made with reference to the embodiment shown in fig. 11, assuming that the duty ratio of the PWM signal is D, since the frequency of the PWM signal is far greater than the bandwidth of the feedback circuit 220, the equivalent resistor connected in parallel with the resistor R5 for the feedback circuit 220That is, the equivalent resistor Req is linear with the duty ratio of the PWM signal, and is no longer a fixed resistor R6.

The expression of the output voltage Vout of the switching power supply module 200 is thus as follows:

obviously, the duty ratio of the output voltage Vout and the PWM signal has a linear relationship, that is, by changing the duty ratio D of the PWM signal, stepless regulation of the resistance of the feedback node of the access feedback circuit 220 can be achieved, thereby achieving stepless regulation of the output voltage Vout.

When the duty cycle d=0%,When the duty cycle d=100%,Vout is in the range of 0% -100% when the duty cycle D is variedAnd changes between. It will be appreciated that the magnitude of the step of the output voltage Vout conversion depends on the resolution of the PWM signal output by the voltage regulator controller 110, and thus stepless voltage regulation may be achieved.

In this embodiment, when the output voltage Vout needs to be changed, the output voltage is adjusted to the target voltage only by continuously changing the duty ratio of the PWM signal, and since the voltage is continuously adjusted, there is no abrupt change of the output voltage Vout, and no large current surge exists in the power change module 210.

It will be appreciated that other forms may be employed in stepless regulation of the feedback node of feedback circuit 220. In one embodiment, as shown in fig. 12-13, the voltage regulation circuit 120 includes a controllable constant current source 123 connected to the voltage regulator controller 110, the controllable constant current source 123 being connected to a feedback node of the switching power supply module 200. The voltage regulating controller 110 is configured to control the current state of the controllable constant current source 123 to gradually change according to the target voltage, so as to steplessly regulate the node voltage Vf of the feedback node.

Specifically, the current form of the controllable constant current source 123 in the embodiment shown in fig. 12 is a sink current, and the current form of the controllable constant current source 123 in the embodiment shown in fig. 13 is a pull current. In actual implementation, the specific current form of the controllable constant current source 123 may be selected according to actual situations.

The method in which the voltage regulation controller 110 controls the current state of the controllable constant current source 123 to be gradually changed according to the target voltage will be described with reference to the embodiment shown in fig. 12 to 13. Assuming that the constant current value of the controllable constant current source 123 is I1, then:

When the controllable constant current source 123 is a sink current, the output voltage Vout of the switching power supply module 200 is:

When the controllable constant current source 123 is a pull current, the output voltage Vout of the switching power supply module 200 is:

As can be seen from the above calculation formula of the output voltage Vout, the output voltage Vout can be changed by changing the constant current value of the controllable constant current source 123 no matter the current is drawn or the current is drawn, and the continuous stepless adjustment of the constant current value of the controllable constant current source 123 is realized, that is, the output voltage Vout can be continuously and steplessly adjusted, the output voltage is adjusted to the target voltage, and no current surge exists in the power change module 210.

The implementation manner of the controllable constant current source 123 is not limited, and in one embodiment, as shown in fig. 14, the controllable constant current source 123 includes a voltage-to-current conversion unit 124, and one end of the voltage-to-current conversion unit 124 is connected to the voltage regulation controller 110, and the other end is connected to a feedback node of the switching power supply module 200. The voltage regulating controller 110 is configured to output a variable voltage Vadj gradually changing according to a target voltage to the voltage-to-current converting unit 124, and the voltage-to-current converting unit 124 is configured to gradually change a current state according to the variable voltage Vadj and a node voltage Vf of a feedback node of the switching power supply module.

In this embodiment, the variable voltage Vadj is a gradually changing voltage output by the voltage regulator controller 110, and in a steady state, the node voltage Vf of the connection node of the resistor R4 and the resistor R5 is equal to the reference voltage of the reference voltage chip U2, so that the voltage difference between the variable voltage Vadj and the reference voltage is applied to the voltage-to-current conversion unit 124, thereby forming a simple controllable constant current source, and the implementation manner is simple and the reliability is high.

The implementation manner of the voltage-to-current conversion unit 124 is various, and as illustrated in the embodiment shown in fig. 14, the voltage-to-current conversion unit 124 includes a resistor R7, where one end of the resistor R7 is connected to the voltage regulation controller 110, and the other end is connected to the feedback node of the switching power supply module 200, so as to form a controllable constant current source, and the structure is simple and the cost is low. The voltage-to-current conversion unit 124 may be implemented in other manners, and those skilled in the art may perform the corresponding functions described above with reference to the conventional techniques in the art.

It should be further noted that, as shown in fig. 15, in actual implementation, the voltage regulation controller 110 may include a variable voltage output module 111 and a control chip (not shown) connected to each other, and the control chip outputs a PWM signal with an adjustable duty ratio to control the variable voltage output module 111 to output the variable voltage Vadj to the voltage-to-current conversion unit 124.

The variable voltage output module 111 may specifically include a resistor RLF and a capacitor CLF, where the resistor RLF and the capacitor CLF form a low-pass filter, and may convert a PWM signal output by the control chip into a dc variable voltage Vadj, so as to implement a DAC (Digital to analog converter, digital-to-analog conversion) function. The control chip may be implemented by an MCU (Microcontroller Unit, micro control unit), a DSP (DIGITAL SIGNAL Processing ), an FPGA (Field Programmable GATE ARRAY, programmable array logic), or other integrated chip.

In this embodiment, assuming that the output voltage of the PWM signal is Vpwm and the duty ratio is D, the variable voltage vadj=d×vpwm, and it can be seen that the voltage value of the variable voltage Vadj can be changed by changing the duty ratio of the PWM signal. Of course, in actual implementation, the output variable voltage Vadj of the DAC function module of the control chip may be directly used according to actual needs, which is not limited in this embodiment.

In one embodiment, as shown in fig. 16, the controllable constant current source 123 includes a current mirror circuit 125, an input side of the current mirror circuit 125 is connected to the voltage regulator controller 110, and a controlled side is connected to a feedback node of the switching power supply module 200. The voltage regulating controller 110 is configured to output a variable voltage Vadj gradually varying according to a target voltage to the current mirror circuit 125, and the current mirror circuit 125 is configured to gradually vary a current state according to the variable voltage Vadj and a node voltage Vf of a feedback node of the switching power supply module 200.

Thus, the current state is continuously changed by the current mirror circuit 125, so that the node voltage Vf at the feedback node is gradually changed, and finally, stepless regulation of the output voltage of the switching power supply module 200 is achieved.

Illustratively, the current mirror circuit 125 includes a switching tube Q5, a switching tube Q6, and a resistor R8, with a first end of the resistor R8 serving as an input side of the current mirror circuit 125 for switching in the variable voltage Vadj. The second end of the resistor R8 is connected to the base of the switching tube Q5, the base of the switching tube Q6, and the collector of the switching tube Q6, both the emitter of the switching tube Q6 and the emitter of the switching tube Q5 are grounded, and the collector of the switching tube Q5 is connected to the feedback node of the switching power supply module 200 as the controlled side of the current mirror circuit 125.

Specifically, assuming that the emitter junction voltages of the switching transistors Q5 and Q6 are Vbe, then:

The constant current value of the constant current source constituted by the current mirror circuit 125 is:

The output voltage Vout of the switching power supply module 200:

obviously, by continuously and steplessly adjusting the variable voltage Vadj, the stepless adjustment of the constant current value of the constant current source can be realized, and the output voltage Vout can be continuously and steplessly adjusted. In this embodiment, a controllable constant current source is formed by the current mirror, so that the constant current value can be controlled more accurately, and the reliability is higher in the process of adjusting the output voltage Vout.

In one embodiment, as shown in fig. 17, the controllable constant current source 123 includes an operational amplifier OPA, a first resistor R9, a second resistor R10, and an adjusting switch Q7, where the non-inverting input terminal of the operational amplifier OPA is connected to the voltage-adjusting controller 110, the output terminal of the operational amplifier OPA is connected to the base of the adjusting switch Q7 through the first resistor R9, the collector of the adjusting switch Q7 is connected to the feedback node of the switching power supply module 200, the emitter of the adjusting switch Q7 is connected to the inverting input terminal of the operational amplifier OPA and the first terminal of the second resistor R10, and the second terminal of the second resistor R10 is grounded.

In this embodiment, the constant current value of the controllable constant current source formed by the operational amplifier OPA, the first resistor R9, the second resistor R10 and the regulating switch tube Q7 is:

The output voltage Vout of the switching power supply module 200:

In this embodiment, the output constant current value can be accurately controlled by the controllable constant current source formed by the operational amplifier OPA, the first resistor R9, the second resistor R10 and the regulating switch tube Q7, so that the constant current value is infinitely adjusted, and the output voltage Vout is infinitely adjusted.

The specific types and parameters of the switch tubes can be set according to actual requirements. The controllable constant current source 123 may also take other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the corresponding functions.

According to the power supply feedback control circuit 100, the node voltage of the feedback node of the switching power supply module 200 is adjusted, so that the switching power supply module which controls various resonant conversion topologies according to the requirements of electric equipment can output corresponding voltages, a plurality of DC-DC conversion modules at the rear end of the resonant conversion topology can be omitted, the circuit structure is greatly simplified, the volume of charging equipment can be reduced, and the requirement of developing a fast-charging product to a small volume is met. Further, by performing stepless regulation on the node voltage Vf of the feedback node of the switching power supply module 200, stepless regulation on the output voltage Vout of the switching power supply module 200 can be achieved, the problem of large current surge of the power change module 200 when the output voltage is rapidly switched is solved, the switching power supply module 200 is safer and more reliable to use, and the failure rate of products is reduced.

The embodiment of the application also provides a switching power supply, which comprises a switching power supply module and a power supply feedback control circuit, wherein the power supply feedback control circuit can be set by referring to the power supply feedback control circuit 100 in each embodiment.

In one embodiment, with continued reference to fig. 2, the switching power supply module mainly includes a power conversion module 210, a feedback circuit 220 connected to the power conversion module 210, and a power supply controller 230 connected to the power conversion module 210 and the feedback circuit 220, respectively, wherein a feedback node of the feedback circuit 220 serves as a feedback node of the switching power supply module 200. The voltage regulator 110 in the power supply feedback control circuit 100 is configured to obtain a target voltage of a target load, and adjust a circuit state of the voltage regulator 120 based on the target voltage to adjust a voltage of a feedback node to a feedback voltage corresponding to the target voltage. The feedback circuit 220 is configured to generate a feedback signal according to the feedback voltage and send the feedback signal to the power controller 230. The power controller 230 is configured to control the power conversion module 210 according to the feedback signal, so that the power conversion module 210 outputs a target voltage.

The topology of the power conversion module 210 may be, but is not limited to, a forward converter, a flyback converter, a full-bridge converter, a half-bridge converter, an LLC converter, etc. The feedback circuit 220 may be configured with reference to the embodiment of fig. 4 or may be adapted according to the embodiment of fig. 4. The configuration of the power supply controller 230 is specifically set according to the need. It can be understood that in actual implementation, the structure of the switching power supply module can be adaptively adjusted according to actual situations, and for example, the switching power supply module can also comprise a module such as filtering.

In one embodiment, the voltage regulator controller 110 in the power supply feedback control circuit 100 is configured to adjust the circuit state of the voltage regulator circuit 120 to gradually change based on the target voltage, so as to steplessly adjust the node voltage Vf of the feedback node to the feedback voltage. The feedback circuit 220 is configured to generate a feedback signal according to the node voltage of the feedback node, and send the feedback signal to the power controller 230. The power controller 230 is configured to control the power conversion module 210 according to the feedback signal, so that the output voltage Vout of the power conversion module 210 gradually changes to the target voltage.

In this embodiment, the power supply feedback control circuit 100 performs stepless adjustment on the node voltage of the feedback node, so that the output voltage Vout of the power conversion module 210 can be subjected to stepless adjustment. Since the output voltage Vout is continuously regulated, there is no abrupt change in the output voltage, and there is no large current surge in the power variation module 210 of the switching power supply module 200, so that the reliability of the switching power supply module 200 is higher.

The embodiment of the application also provides electronic equipment, which comprises the switching power supply, wherein the structure of the switching power supply can be set by referring to the embodiment.

In one embodiment, the electronic device is a charging device, the charging device including an output interface, and obtaining a target voltage of the target load includes obtaining a required charging voltage of the output interface to the device.

Specifically, the electronic device may be a charging device such as an adapter, a charger or the like, and the output interface is used for connecting the device to be charged, wherein the obtaining of the target voltage of the target load includes obtaining the required charging voltage of the output interface access device, and the way of obtaining the target voltage of the target load is not limited, and a person skilled in the art can set the device according to the conventional technology in the art, and only needs to implement the corresponding function.

The embodiment of the application also provides a power supply feedback control method, which can be applied to the power supply feedback control circuit 100 shown in fig. 1, wherein the voltage regulating controller 110 is used for obtaining the target voltage of the target load, and based on the target voltage, the circuit state of the voltage regulating circuit 120 is regulated to regulate the voltage of the feedback node of the switching power supply module 200, so that the switching power supply module 200 outputs the target voltage according to the voltage of the feedback node.

In one embodiment, as shown in fig. 18, a power supply feedback control method is provided, and the method is applied to the voltage regulator controller 110 in fig. 1, for example, and includes the following steps 300 and 400.

Step 300, obtaining a target voltage of a target load.

The target load is the device that needs to be powered by the output voltage. The mode that the voltage regulating controller obtains the target voltage of the target load is not limited, the voltage regulating controller can be communicated with the target load to receive the power utilization protocol sent by the target load so as to determine the target voltage, and the user can directly input the target voltage of the target load through an interaction module of the voltage regulating controller.

Step 400, adjusting the circuit state of the voltage regulating circuit based on the target voltage, and adjusting the circuit state of the voltage regulating circuit to adjust the voltage of the feedback node of the feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node. For specific adjustment principles, reference may be made to the embodiments of the power feedback control circuit 100 described above, and the description of this embodiment is omitted.

In one embodiment, in step 400, adjusting a circuit state of the voltage regulating circuit based on the target voltage to adjust a voltage of a feedback node of the switching power supply module specifically includes:

based on the target voltage, the circuit state of the voltage regulating circuit is regulated to be gradually changed so as to carry out stepless regulation on the node voltage of the feedback node.

Therefore, the output voltage of the switching power supply module can be subjected to stepless regulation by carrying out stepless regulation on the node voltage of the feedback node. Because the output voltage is continuously regulated, no output voltage mutation exists, and no large current impact exists in the power change module of the switching power supply module, so that the reliability of the switching power supply module is higher.

Based on the same inventive concept, the embodiment of the application also provides a power supply feedback control device for realizing the power supply feedback control method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the power feedback control device or devices provided below may be referred to the limitation of the power feedback control method hereinabove, and will not be repeated here.

In one embodiment, as shown in FIG. 19, there is provided a power supply feedback control device, comprising a voltage acquisition module 500 and an adjustment module 600, wherein:

a voltage acquisition module 500 for acquiring a target voltage of a target load;

the adjusting module 600 is configured to adjust a circuit state of the voltage adjusting circuit based on the target voltage, so as to adjust a voltage of a feedback node of a feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node.

In one embodiment, the adjustment module 600 is further configured to adjust the gradual change of the circuit state of the voltage adjustment circuit based on the target voltage, so as to perform stepless adjustment on the node voltage of the feedback node.

The above-described respective modules in the power supply feedback control apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:

acquiring a target voltage of a target load;

Based on the target voltage, the circuit state of the voltage regulating circuit is regulated to regulate the voltage of the feedback node of the feedback circuit of the switching power supply module, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node.

In one embodiment, the computer program when executed by the processor further implements the step of adjusting the gradual change in the circuit state of the voltage regulator circuit based on the target voltage to steplessly adjust the node voltage of the feedback node.

In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:

acquiring a target voltage of a target load;

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. The power supply feedback control circuit is characterized by being connected with a switching power supply module, and comprises a voltage regulating controller and a voltage regulating circuit which are connected, wherein the voltage regulating circuit is connected with a feedback node of a feedback circuit of the switching power supply module:

2. The power supply feedback control circuit of claim 1, wherein,

The voltage regulating controller is used for regulating the circuit state of the voltage regulating circuit to gradually change in the process of regulating the circuit state of the voltage regulating circuit so as to steplessly regulate the node voltage of the feedback node.

3. The power supply feedback control circuit of claim 2, wherein the voltage regulator controller outputs a PWM signal to the regulator circuit for controlling the regulator circuit to change its equivalent resistance or current parameter.

4. The power supply feedback control circuit according to claim 2, wherein the voltage regulating circuit comprises a voltage dividing unit and a voltage regulating switch, one end of the voltage dividing unit is connected with a feedback node of the feedback circuit of the switching power supply module, the other end of the voltage dividing unit is grounded through the voltage regulating switch, and a controlled end of the voltage regulating switch is connected with the voltage regulating controller;

5. The power supply feedback control circuit of claim 4, wherein,

The voltage regulating controller is used for determining a preset switching frequency, an initial duty ratio and a target duty ratio of a PWM signal according to the target voltage and outputting the PWM signal with the duty ratio gradually changed to the voltage regulating switch, wherein the duty ratio of the PWM signal is determined based on the initial duty ratio and the target duty ratio, and the frequency of the PWM signal is the preset switching frequency.

6. The power supply feedback control circuit of claim 2, wherein the voltage regulation circuit comprises a controllable constant current source connected to the voltage regulation controller, the controllable constant current source being connected to a feedback node of a feedback circuit of the switching power supply module;

7. The power supply feedback control circuit according to claim 6, wherein the controllable constant current source comprises a voltage-to-current conversion unit, one end of the voltage-to-current conversion unit is connected with the voltage regulation controller, and the other end of the voltage-to-current conversion unit is connected with a feedback node of a feedback circuit of the switching power supply module;

8. The power supply feedback control circuit of claim 6 wherein the controllable constant current source comprises a current mirror circuit, an input side of the current mirror circuit being connected to the voltage regulator controller, a controlled side being connected to a feedback node of a feedback circuit of the switching power supply module;

9. The power supply feedback control circuit according to claim 6, wherein the controllable constant current source comprises an operational amplifier, a first resistor, a second resistor and an adjusting switch tube, wherein the non-inverting input end of the operational amplifier is connected with the voltage-regulating controller, the output end of the operational amplifier is connected with the base electrode of the adjusting switch tube through the first resistor, the collector electrode of the adjusting switch tube is connected with the feedback node of the feedback circuit of the switching power supply module, and the emitter electrode of the adjusting switch tube is respectively connected with the inverting input end of the operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

10. A switching power supply comprising a switching power supply module and a power supply feedback control circuit according to any one of claims 1 to 9.

11. The switching power supply of claim 10 wherein said switching power supply module comprises a power conversion module, a feedback circuit coupled to said power conversion module, and a power supply controller coupled to said power conversion module and said feedback circuit, respectively;

12. The switching power supply of claim 11 wherein the switching power supply is configured to provide the switching power supply,

The voltage regulating controller is used for regulating the circuit state of the voltage regulating circuit to gradually change based on the target voltage so as to steplessly regulate the node voltage of the feedback node to the feedback voltage;

13. An electronic device comprising a switching power supply as claimed in any one of claims 10 to 12.

14. The electronic device of claim 13, wherein the electronic device is a charging device comprising an output interface, and wherein the obtaining the target voltage for the target load comprises obtaining a required charging voltage for the output interface to access the device.