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

Abstract

The invention 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 regulation controller and a voltage regulation circuit which are connected with each other, and the voltage regulation circuit is connected with a feedback node of a feedback circuit of the switching power supply module. And the voltage regulation controller is used for acquiring the target voltage of the target load and regulating the circuit state of the voltage regulation 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. By connecting the power supply feedback control circuit to the feedback node, the switching power supply modules of various resonant transformation topologies can be controlled to output corresponding voltages according to the requirements of electric equipment, so that a plurality of DC-DC conversion modules at the rear ends of the resonant transformation topologies can be omitted, the circuit structure is simplified, meanwhile, the size of charging equipment is reduced, and the cost is reduced. And the requirement of small-size development of fast-charging products is met.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a power supply feedback control circuit, a switching power supply and an electronic device. Background Art

[0002] With the rapid development of consumer electronics, smart fast charging has been widely used in consumer electronics devices such as smartphones and tablets. With the continuous update of the USB PD (Universal Serial Bus Power Delivery) standard, the fast charging power is getting higher and higher; related fast charging products are gradually developing towards high frequency, small size, and high power density.

[0003] At present, various resonant conversion topologies are widely used in smart fast charging scenarios. In portable charging devices or adapters, power conversion is achieved through various resonant conversion topologies. However, the voltage output by the resonant conversion topology is fixed. Therefore, in portable charging devices or adapters, multiple DC-DC (direct current-to-direct current) conversion modules are also connected to the back end of the resonant conversion topology to adapt to electrical devices with different voltage requirements. This makes the charging device complex and large in size, making it difficult to meet the needs of fast charging products to develop in small sizes. Summary of the invention

[0004] Based on this, it is necessary to provide a power feedback control circuit, a switching power supply, an electronic device, a power feedback control method, a power feedback control device, a computer-readable storage medium and a computer program product, which can control the switching power supply module to output the corresponding voltage according to the needs of the electrical equipment, thereby eliminating the DC-DC conversion module at the back end of the resonant conversion topology.

[0005] In a first aspect, the present application provides a power feedback control circuit. The power feedback control circuit is used to connect to a switching power supply module; the power feedback control circuit includes a voltage regulator controller and a voltage regulator circuit connected to each other, and the voltage regulator circuit is connected to a feedback node of a feedback circuit of the switching power supply module:

[0006] The voltage regulator controller is used to obtain a target voltage of a target load and adjust a circuit state of the voltage regulator circuit based on the target voltage 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.

[0007] In one of the embodiments, the voltage regulating controller, in the process of adjusting the circuit state of the voltage regulating circuit, adjusts the circuit state of the voltage regulating circuit to change gradually, so as to perform stepless regulation on the node voltage of the feedback node.

[0008] In one embodiment, the voltage regulating controller outputs a PWM signal to the regulating circuit, so as to control the regulating circuit to change its own equivalent resistance or current parameter.

[0009] In one embodiment, the voltage regulating circuit includes a voltage dividing unit and a voltage regulating switch, one end of the voltage dividing unit is connected to the feedback node of the feedback circuit of the switching power supply module, and the other end is grounded through the voltage regulating switch, and the controlled end of the voltage regulating switch is connected to the voltage regulating controller;

[0010] The voltage regulating controller is used to control the on-time of the voltage regulating switch at a preset switching frequency to gradually change according to the target voltage, and adjust the resistance state of the voltage dividing unit to gradually change, so as to steplessly regulate the node voltage of the feedback node.

[0011] In one of the embodiments, the voltage regulating controller is used to determine the preset switching frequency, initial duty cycle and target duty cycle of the PWM signal according to the target voltage, and output a PWM signal with a gradually changing duty cycle to the voltage regulating switch; 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.

[0012] In one of the embodiments, the voltage regulation circuit includes a controllable constant current source connected to the voltage regulation controller, and the controllable constant current source is connected to a feedback node of a feedback circuit of the switching power supply module;

[0013] The voltage regulating controller is used to control the current state of the controllable constant current source to gradually change according to the target voltage, so as to perform stepless regulation on the node voltage of the feedback node.

[0014] In one embodiment, the controllable constant current source includes a voltage-current conversion unit, one end of which is connected to the voltage regulator controller, and the other end of which is connected to a feedback node of a feedback circuit of the switching power supply module;

[0015] The voltage regulating controller is used to output a gradually changing variable voltage to the voltage-to-current conversion unit according to the target voltage;

[0016] The voltage-to-current conversion unit is used to gradually change the current state according to the variable voltage and the voltage of the feedback node.

[0017] In one embodiment, the controllable constant current source includes a current mirror circuit, the input side of the current mirror circuit is connected to the voltage regulator controller, and the controlled side is connected to the feedback node of the feedback circuit of the switching power supply module;

[0018] The voltage regulating controller is used for outputting a gradually changing variable voltage to the current mirror circuit according to the target voltage;

[0019] The current mirror circuit is used to gradually change the current state according to the variable voltage and the voltage of the feedback node.

[0020] In one embodiment, the controllable constant current source includes an operational amplifier, a first resistor, a second resistor and a regulating switch tube, the non-inverting input terminal of the operational amplifier is connected to the voltage regulating controller, the output terminal of the operational amplifier is connected to the base of the regulating switch tube via the first resistor, the collector of the regulating switch tube is connected to the feedback node of the feedback circuit of the switching power supply module, the emitter of the regulating switch tube is respectively connected to the inverting input terminal of the operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

[0021] In a second aspect, the present application further provides a switching power supply, which includes a switching power supply module and the power supply feedback control circuit as described above.

[0022] In one embodiment, the switching power supply module includes: a power conversion module, a feedback circuit connected to the power conversion module, and a power supply controller connected to the power conversion module and the feedback circuit respectively;

[0023] The voltage regulating controller is used to obtain a target voltage of a target load, and based on the target voltage, adjust a circuit state of the voltage regulating circuit to adjust the voltage of the feedback node to a feedback voltage corresponding to the target voltage;

[0024] The feedback circuit is used to generate a feedback signal according to the feedback voltage, and send the feedback signal to the power controller;

[0025] The power supply controller is used to control the power conversion module according to the feedback signal so that the power conversion module outputs the target voltage.

[0026] In one of the embodiments, the voltage regulator controller is used to adjust the circuit state of the voltage regulator circuit to gradually change based on the target voltage, so as to steplessly adjust the node voltage of the feedback node to the feedback voltage;

[0027] The feedback circuit is used to generate a feedback signal according to the gradually changing node voltage of the feedback node, and send the feedback signal to the power controller;

[0028] The power supply controller is used to control the power conversion module according to the feedback signal so that the output voltage of the power conversion module gradually changes to the target voltage.

[0029] In a third aspect, the present application further provides an electronic device, wherein the electronic device comprises the switching power supply as described above.

[0030] In one embodiment, the electronic device is a charging device, and the charging device includes an output interface. The acquiring the target voltage of the target load includes: acquiring a required charging voltage of a device connected to the output interface.

[0031] In a fourth aspect, the present application further provides a power supply feedback control method. The power supply feedback control method comprises:

[0032] Obtaining a target voltage of a target load;

[0033] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0034] In one embodiment, adjusting the circuit state of the voltage regulating circuit based on the target voltage to adjust the voltage of the feedback node of the switching power supply module includes:

[0035] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to change gradually, so as to perform stepless regulation on the node voltage of the feedback node.

[0036] In a fifth aspect, the present application further provides a power supply feedback control device. The power supply feedback control device comprises:

[0037] A voltage acquisition module, used to acquire a target voltage of a target load;

[0038] The adjustment module is used to adjust the circuit state of the voltage regulating circuit based on the target voltage to adjust the voltage of the feedback node of the feedback circuit of the switching power module so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0039] In a sixth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0040] Obtaining a target voltage of a target load;

[0041] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0042] In a seventh aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0043] Obtaining a target voltage of a target load;

[0044] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0045] The above-mentioned power feedback control circuit, switching power supply, electronic device, power feedback control method, power feedback control device, computer-readable storage medium and computer program product, the power feedback control circuit is used to connect with the switching power supply module, specifically including a connected voltage regulator controller and a voltage regulator circuit, the voltage regulator circuit is connected to the feedback node of the switching power supply module feedback circuit: the voltage regulator controller is used to obtain the target voltage of the target load, and based on the target voltage, adjust the circuit state of the voltage regulator circuit 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. Therefore, by connecting the power feedback control circuit to the feedback node of the switching power supply module, it is possible to control the switching power supply modules of various resonant conversion topologies to output corresponding voltages according to the needs of the electrical equipment, thereby eliminating multiple DC-DC conversion modules at the back end of the resonant conversion topology, greatly simplifying the circuit structure, and at the same time reducing the volume of the charging equipment to meet the needs of fast charging products to develop towards small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 is a module schematic diagram of a power feedback control circuit in one embodiment;

[0048] Figure 2 A schematic diagram of a power feedback control circuit and a switching power supply module in one embodiment;

[0049] Figure 3 A schematic diagram of a circuit structure of a topology of a power conversion module in the related art;

[0050] Figure 4 It is a structural schematic diagram of a feedback circuit of a switching power supply module in the related art;

[0051] Figure 5 A schematic diagram of the connection between a power supply feedback control circuit and a feedback circuit in one embodiment;

[0052] Figure 6a for Figure 3 An equivalent schematic diagram of the topology of the power conversion module shown in one working state;

[0053] Figure 6b for Figure 3 An equivalent schematic diagram of the topology of the power conversion module shown in another working state;

[0054] Figure 7 Schematic diagram of various voltage waveforms obtained by conducting an experiment according to the schematic diagram described in FIG6 ;

[0055] Figure 8 A schematic diagram of a current waveform obtained by conducting an experiment according to the schematic diagram described in FIG6 ;

[0056] Fig. 9 6 is a schematic diagram of current and voltage waveforms obtained by conducting an experiment in accordance with the schematic diagram described in FIG. 6 in one embodiment;

[0057] Fig.10 is a module schematic diagram of a power feedback control circuit in another embodiment;

[0058] Fig.11 is a circuit structure schematic diagram of a voltage regulating circuit in another embodiment;

[0059] Fig.12 is a module schematic diagram of a voltage regulating circuit in yet another embodiment;

[0060] Fig.13 A schematic diagram of a module of a voltage regulating circuit in yet another embodiment;

[0061] Fig.14 Schematic diagram of the circuit structure of a controllable constant current source in one embodiment;

[0062] Fig.15 A partial circuit diagram of a voltage regulator controller in one embodiment;

[0063] Fig.16 is a schematic diagram of the circuit structure of a controllable constant current source in another embodiment;

[0064] Fig.17 Schematic diagram of the circuit structure of a controllable constant current source in another embodiment;

[0065] Fig.18 is a flow chart of a power supply feedback control method in one embodiment;

[0066] Fig.19FIG. 4 is a structural block diagram of a power supply feedback control device in one embodiment. DETAILED DESCRIPTION

[0067] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0069] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0070] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0071] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0072] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0073] In one embodiment, Figure 1As shown, a power feedback control circuit 100 is provided. The power feedback control circuit 100 is used to be connected to a switching power module 200, and specifically includes a voltage regulating controller 110 and a voltage regulating circuit 120 connected to each other, and the voltage regulating circuit 120 is connected to a feedback node of a feedback circuit of the switching power module 200. The voltage regulating controller 110 is used to obtain a target voltage of a target load, and based on the target voltage, adjust the circuit state of the voltage regulating circuit 120 to adjust the voltage of the feedback node of the feedback circuit of the switching power module 200, so that the switching power module 200 outputs the target voltage according to the voltage of the feedback node.

[0074] The switching power supply module 200 is used to convert the input voltage signal Vin into a stable DC voltage signal Vout. The typical structure of the switching power supply module 200 is as follows: Figure 2 As shown, it at least includes a power conversion module 210, a feedback circuit 220 connected to the power conversion module 210, and a power controller 230 respectively connected to the power conversion module 210 and the feedback circuit 220. The feedback node of the feedback circuit 220 serves as the feedback node of the switching power module 200.

[0075] 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. For the convenience of explaining the principle of the power conversion module 210, please refer to Figure 3 The asymmetric half-bridge flyback converter topology shown in the figure 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 can be an independent inductor or a leakage inductor of a transformer), an excitation inductor Lm (the ideal transformer Tr, the resonant inductor Lr and the excitation inductor Lm constitute an actual transformer model), a resonant capacitor Cr (its positive and negative signs indicate the voltage polarity on the resonant capacitor Cr during steady-state operation), and an output filter capacitor Cout. In actual implementation, the power tubes Q1, Q2 and 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 and obtain the output voltage Vout by adjusting the working states of the power tubes Q1, Q2 and Q3. The specific implementation method of the power controller 230 does not need to be limited, and those skilled in the art can make settings with reference to the commonly used techniques in the field. For example, the power controller 230 may include a primary control unit and a secondary control unit, wherein the primary control unit is connected to the power tube Q1 and the power tube Q2 respectively, and the secondary control unit is connected to the power tube Q3. When controlling the power conversion module 210 to work, 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.

[0076] The typical structure of the feedback circuit 220 can be found in Figure 4 As shown, it mainly includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, optocoupler U1 and reference voltage chip U2. One end of resistor R1 is connected to the output voltage Vout, and the other end is connected to the anode of the light-emitting tube of the optocoupler U1. The cathode of the light-emitting tube of the optocoupler U1 is connected to the cathode pin of the reference voltage chip U2, and the anode pin of the reference voltage chip U2 is grounded. One end of resistor R4 is connected to the output voltage Vout, and the other end is grounded through resistor R5. The connection point of resistor R4 and resistor R5 is used as the feedback node of the feedback circuit 220 and is connected to the reference pin of the reference voltage chip U2. One end of capacitor C1 is connected to the cathode of the light-emitting tube of the optocoupler U1, and the other end is connected to the feedback node through resistor R3. Capacitor C2 is connected between the cathode of the light-emitting tube of the optocoupler U1 and the feedback node. Resistor R2 is connected in parallel to the two ends of the light-emitting tube of the optocoupler U1 as a bypass resistor of the optocoupler U1. The emitter of the triode of the optocoupler U1 is grounded, and the anode outputs the feedback signal FB to the power controller 230.

[0077] Among them, the resistor R4 and the resistor R5 are used to sample the output voltage Vout to obtain the node voltage Vf of the feedback node. The reference voltage chip U2 controls the voltage of the cathode of the light-emitting tube of the optocoupler U1 according to its reference voltage and the node voltage Vf, thereby outputting the corresponding feedback signal FB through the optocoupler U1, so that the power controller 230 receives the output state of the secondary of the power conversion module 210. When the power controller 230 determines that the output voltage decreases according to the feedback signal FB, it controls the output power of the power conversion module 210 to increase, so that the output voltage Vout increases; when it determines that the output voltage increases according to the feedback signal FB, it controls the output power of the power conversion module 210 to decrease, so that the output voltage Vout decreases, thereby realizing the control of the power conversion module 210 to dynamically adjust the output voltage Vout to keep it stable. The feedback circuit 220 can also adopt other forms, not limited to Figure 4 The forms mentioned in the embodiments are sufficient as long as they can achieve the above-mentioned feedback function.

[0078] In this embodiment, the voltage regulator controller 110 is used to obtain the target voltage of the 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 other electrical equipment. 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 way in which the voltage regulator controller 110 obtains the target voltage of the target load does not need to be limited. For example, the voltage regulator controller 110 can communicate with the target load and receive the power consumption agreement sent by the target load to determine the target voltage; or the user can directly input the target voltage of the target load through the interactive module of the voltage regulator controller 110.

[0079] 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 adjusting the voltage of the feedback node of the switching power supply module 200. In order to facilitate the explanation of the specific voltage regulation principle, the feedback circuit 220 is used as the following. Figure 4 The structure shown in the figure is used as an example to illustrate. Figure 5 As shown, in one embodiment, the voltage regulating circuit 120 is connected to the feedback node (the connection point of the resistor R4 and the resistor R5). When the circuit state of the voltage regulating circuit 120 changes to the target state corresponding to the target voltage, the node voltage Vf of the feedback node will also change to the voltage value corresponding to the target voltage, and then be fed back to the power controller 230 through the feedback signal FB, and the power controller 230 controls the power conversion module 210 to adjust the output voltage Vout to the target voltage.

[0080] The voltage regulator controller 110 adjusts the circuit state of the voltage regulator circuit 120 by adjusting the resistance state of the voltage regulator circuit 120. It can be understood that when the resistance state of the voltage regulator circuit 120 changes, the voltage division state of the resistor R4 and the resistor R5 will be changed, thereby changing the node voltage Vf. The voltage regulator controller 110 adjusts the circuit state of the voltage regulator circuit 120 by adjusting the current state of the voltage regulator circuit 120 to change the voltage division result of the resistor R4 and the resistor R5, thereby changing the node voltage Vf.

[0081] The power feedback control circuit 100 includes a voltage regulator controller 110 and a voltage regulator circuit 120 connected to each other, and the voltage regulator circuit 120 is connected to the feedback node of the switching power module 200: the voltage regulator controller 110 is used to obtain the target voltage of the target load, and adjust the circuit state of the voltage regulator circuit 120 based on the target voltage to adjust the voltage of the feedback node of the switching power module 200, so that the switching power module 200 outputs the target voltage according to the voltage of the feedback node. By connecting the power feedback control circuit 100 to the feedback node of the switching power module 200, it is possible to control the switching power modules 200 of various resonant conversion topologies to output corresponding voltages according to the needs of the electrical equipment. As a result, multiple DC-DC conversion modules at the back end of the resonant conversion topology can be omitted, which greatly simplifies the circuit structure. At the same time, the volume of the charging equipment can be reduced to meet the demand for fast charging products to develop in a small volume.

[0082] In the process of adjusting the circuit state of the voltage regulating circuit 120, the voltage regulating controller 110 may make the voltage regulating circuit 120 directly and quickly switch from the current state to the target state; or may make the voltage regulating circuit 120 gradually change from the current state until the target state is reached. The specific adjustment method can be determined in combination with the required switching time, the topology of the power conversion module 210 in the switching power supply module 200 and other specific circumstances.

[0083] In one embodiment, the voltage regulator controller 110 adjusts the circuit state of the voltage regulator circuit 120 to change gradually during the process of adjusting the circuit state of the voltage regulator circuit 120 , so as to perform stepless regulation on the node voltage Vf of the feedback node.

[0084] It should be noted that, depending on the topology, when the voltage regulating circuit 120 switches directly and quickly from the current state to the target state, the output voltage VOUT will also switch quickly to the target voltage. During this process, a large impact current may be generated inside the power conversion module 210, which may easily damage the power tube.

[0085] For details, please refer again to Figure 3 , still taking the asymmetric half-bridge flyback converter topology as an example, the situation in which a large impact current may be generated inside the power conversion module 210 is explained. The working process of the asymmetric half-bridge flyback converter topology is relatively complex and is divided into multiple states. For the sake of convenience, only two of the states are briefly explained temporarily. To make it easier to understand, the asymmetric half-bridge flyback converter topology schematic diagram can be further equivalently processed: when the power tube is turned on, the resistance is ignored and the wire is used as an equivalent; in steady state, the voltage of the resonant capacitor Cr is equivalent to the voltage source Vcr; assuming that the turns ratio of the primary and secondary of the ideal transformer Tr is Nps, and the output voltage is Vout, then the output voltage Vout converted to the primary voltage of the transformer Tr is Nps*Vout, so the voltage source Vr=Nps*Vout can be used to convert the output voltage to the primary voltage of the transformer Tr.

[0086] According to the above equivalent, the first state of the asymmetric half-bridge flyback converter topology is: when the power tube Q1 is turned on, the power tube Q2 is turned off, and the power tube Q3 is turned off, the ideal transformer Tr does not work because the power tube Q3 is turned off. The input voltage Vin charges the resonant capacitor Cr through the power tube Q1-resonant inductor Lr-excitation inductor Lm-resonant capacitor Cr path, and at the same time excites the excitation inductor Lm to store energy. The equivalent circuit is as follows: Figure 6a shown.

[0087] The second state is: the power tube Q1 is turned off, the power tube Q2 is turned on, and when the power tube Q3 is turned on, the ideal transformer Tr starts to transfer energy to the secondary, and the excitation inductance Lm is converted by the output voltage Vout to the voltage Vr of the primary of the transformer Tr to clamp; the voltage Vcr on the resonant capacitor Cr is discharged through the path of excitation inductance Lm-transformer Tr primary (voltage Vr)-resonant inductance Lr, and at the same time, the excitation inductance Lm is demagnetized and energy is transferred to the secondary. The equivalent circuit is as follows: Figure 6b shown.

[0088] Combination Figure 7As shown, when the voltage regulating circuit 120 switches directly and quickly from the current state to the target state, the output voltage Vout will also switch quickly to the target voltage, and the voltage source Vr = Nps*Vout, Nps is the transformer turns ratio, which is fixed. Therefore, when the output voltage Vout switches, the voltage source Vr also changes with the output voltage Vout in proportion to Nps, and the capacitor voltage cannot change suddenly. At this time, the constant voltage source Vcr remains unchanged. From the equivalent circuit of state 2 Figure 6b It can be seen that when the voltages of the constant voltage source Vcr and the constant voltage source Vr are not equal, the voltage difference is all applied to the resonant inductor Lr. Since the impedance in the circuit is very small at this time, a large instantaneous impact current will be generated in the equivalent circuit. Figure 8 The greater the voltage difference between the constant voltage source Vcr and the constant voltage source Vr, the greater the impact current, and the easier it is to damage components such as power tubes.

[0089] In this embodiment, the circuit state of the voltage regulating circuit 120 is gradually changed to steplessly adjust the node voltage Vf of the feedback node, so that the switching power supply module 200 outputs a gradually changing output voltage Vout according to the gradually changing node voltage Vf, until the output voltage Vout reaches the target voltage. Fig. 9 In this process, the output voltage Vout is steplessly regulated. Since there is no sudden change in the output voltage Vout, the constant voltage source Vcr and the constant voltage source Vr change synchronously, and the waveforms are consistent and equal, and there is no voltage difference between the two. Therefore, the current in the loop transitions smoothly, and there is no impact current. This reduces the current stress of the power tube, making the switching power supply module 200 safer and more reliable, and reducing the product failure rate.

[0090] In one embodiment, the voltage regulator controller 110 outputs a PWM signal to the regulating circuit 120 for controlling the regulating circuit 120 to change its own equivalent resistance or current parameter.

[0091] Specifically, the voltage regulator controller 110 outputs a PWM signal to the regulating circuit 120, and controls the equivalent resistance or current parameter of the regulating circuit 120 by adjusting the duty cycle of the PWM signal. When the equivalent resistance of the regulating circuit 120 itself changes, the voltage division state of the resistor R4 and the resistor R5 will change, thereby changing the node voltage Vf; when the current parameter of the regulating circuit 120 changes, the magnitude of the node voltage Vf will also change. It can be understood that when adjusting the duty cycle of the PWM signal, the duty cycle of the PWM signal can be gradually changed as needed. Therefore, by adjusting the duty cycle of the PWM signal, the voltage of the feedback node can be adjusted, and then the output voltage can be adjusted.

[0092] In one embodiment, Fig.10As shown, 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 the feedback node of the 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 the controlled end of the voltage regulating switch 122 is connected to the voltage regulating controller 110. The voltage regulating controller 110 is used to control the conduction 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 steplessly adjust the node voltage Vf of the feedback node.

[0093] Among them, the preset switching frequency is the frequency for controlling the voltage regulating switch 122 to switch the switching state. When setting it, it can refer to the parameter setting of the feedback circuit 220, or it can be directly set to a larger frequency. As long as the switching frequency is much larger than the bandwidth of the feedback circuit 220 (such as the switching frequency is 5-10 times the feedback loop bandwidth), it is possible to avoid the switching frequency of the voltage regulating switch 122 being very small, and the voltage dividing state of the voltage dividing unit 121 affecting the stability of the feedback circuit 220.

[0094] In this embodiment, by adjusting the conduction time of the voltage regulating switch 122 to gradually change at an unchanged preset switching frequency, the resistance state of the voltage dividing unit 121 connected to the feedback node gradually changes, thereby steplessly adjusting the node voltage Vf of the feedback node to achieve stepless regulation of the output voltage Vout.

[0095] The specific structures of the voltage dividing unit 121 and the voltage regulating switch 122 do not need to be limited. Fig.11 As shown, in one embodiment, the voltage dividing unit 121 may include a resistor R6, and the voltage regulating switch 122 may include a switch tube Q4, one end of the resistor R6 is connected to the feedback node, the other end of the resistor R6 is grounded through the switch tube Q4, and the controlled end of the switch tube Q4 is connected to the voltage regulating controller 110. The specific connection structure of the switch tube Q4 and the resistor R6 needs to be determined in combination with the specific selection of the switch tube Q4. Exemplarily, the switch tube Q4 can be a triode, a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor Field Effect Transistor) tube or a similar component. The resistor R6 can be an independent resistor or an equivalent circuit formed by connecting multiple resistors, which does not need to be specifically limited.

[0096] Thus, the voltage regulating controller 110 controls the on-time of the switch 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 can gradually change, so as to achieve stepless regulation of the node voltage Vf of the feedback node, and further achieve stepless regulation of the output voltage of the switching power supply module 200.

[0097] In one embodiment, the voltage regulating controller 110 determines the preset switching frequency, initial duty cycle and target duty cycle of the PWM signal according to the target voltage, and outputs a PWM signal with a gradually changing duty cycle to the voltage regulating switch 122; 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.

[0098] In this embodiment, the voltage regulator controller 110 generates a PWM signal with a gradually changing duty cycle, 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 can determine the target resistance state that needs to be connected to the feedback node according to the target voltage, thereby determining the preset switching frequency, the initial duty cycle and the target duty cycle of the PWM signal according to the current output voltage Vout of the switching power supply module 200 and the target voltage. The method for determining the preset switching frequency can refer to the above embodiment, and will not be repeated in this embodiment.

[0099] The method for the voltage regulator controller 110 to determine the duty cycle of the PWM signal according to the target voltage can be described with reference to the embodiment shown in FIG11. Assuming that the duty cycle of the PWM signal is D, since the frequency of the PWM signal is much larger than the bandwidth of the feedback circuit 220, the equivalent resistor connected in parallel with the resistor R5 is D for the feedback circuit 220. That is, the equivalent resistance Req is linearly related to the duty cycle of the PWM signal and is no longer a fixed resistance R6.

[0100] Therefore, the output voltage Vout of the switching power supply module 200 is expressed as follows:

[0101]

[0102] Obviously, there is a linear relationship between the output voltage Vout and the duty cycle of the PWM signal, that is, by changing the duty cycle D of the PWM signal, the resistance of the feedback node connected to the feedback circuit 220 can be adjusted steplessly, thereby achieving stepless voltage regulation of the output voltage Vout.

[0103] When the duty cycle D = 0%, When the duty cycle D = 100%, When the duty cycle D changes in the range of 0%-100%, Vout It can be understood that the step amplitude of the output voltage Vout conversion depends on the resolution of the PWM signal output by the voltage regulation controller 110, so stepless voltage regulation can be achieved.

[0104] In this embodiment, when the output voltage Vout needs to be changed, the output voltage can be adjusted to the target voltage by only continuously changing the duty cycle of the PWM signal. Moreover, since the voltage is continuously adjusted, there is no large sudden change in the output voltage Vout, and there is no large current shock in the power change module 210.

[0105] It is understandable that other forms may be used when performing stepless voltage regulation on the feedback node of the feedback circuit 220. Figure 12-13 As shown, the voltage regulating circuit 120 includes a controllable constant current source 123 connected to the voltage regulating controller 110, and the controllable constant current source 123 is connected to the feedback node of the switching power supply module 200. The voltage regulating controller 110 is used to control the current state of the controllable constant current source 123 to gradually change according to the target voltage, so as to steplessly adjust the node voltage Vf of the feedback node.

[0106] Specifically, Fig.12 In the embodiment shown, the current form of the controllable constant current source 123 is a sink current; Fig.13 In the embodiment shown, the current form of the controllable constant current source 123 is a source current. In actual implementation, the specific current form of the controllable constant current source 123 can be selected according to actual conditions.

[0107] The method for the voltage regulator controller 110 to control the current state of the controllable constant current source 123 to gradually change according to the target voltage is as follows: Figure 12-13 Assuming that the constant current value of the controllable constant current source 123 is I1, then:

[0108] When the controllable constant current source 123 is sinking current, the output voltage Vout of the switching power supply module 200 is:

[0109]

[0110] When the controllable constant current source 123 is sourcing current, the output voltage Vout of the switching power supply module 200 is:

[0111]

[0112] It can be seen from the above-mentioned output voltage Vout calculation formula that: no matter whether it is current injection or current sourcing, the output voltage Vout can be changed by simply changing the constant current value of the controllable constant current source 123; by realizing continuous and stepless adjustment of the constant current value of the controllable constant current source 123, the output voltage Vout can be continuously and steplessly adjusted, so that the output voltage can be adjusted to the target voltage, and there is no current shock in the power change module 210.

[0113] The implementation method of the controllable constant current source 123 does not need to be limited. In one embodiment, Fig.14As shown, the controllable constant current source 123 includes a voltage-current conversion unit 124, one end of which is connected to the voltage regulator controller 110, and the other end is connected to the feedback node of the switching power module 200. The voltage regulator controller 110 is used to output a gradually changing variable voltage Vadj to the voltage-current conversion unit 124 according to the target voltage; the voltage-current conversion unit 124 is used to gradually change the current state according to the variable voltage Vadj and the node voltage Vf of the feedback node of the switching power module.

[0114] In this embodiment, the variable voltage Vadj is a gradually changing voltage output by the voltage regulating controller 110. In a steady state, the node voltage Vf of the node connecting the resistors R4 and R5 is equal to the reference voltage of the reference voltage chip U2. Therefore, the voltage difference between the variable voltage Vadj and the reference voltage is added to the voltage-to-current conversion unit 124 to form a simple controllable constant current source with simple implementation and high reliability.

[0115] There are many ways to implement the pressure-flow conversion unit 124, for example, Fig.14 In the illustrated embodiment, the voltage-current conversion unit 124 includes a resistor R7, one end of which is connected to the voltage regulator controller 110, and the other end of which is connected to the feedback node of the switching power supply module 200, thereby forming a controllable constant current source with a simple structure and low cost. The voltage-current conversion unit 124 can also be implemented in other ways, and those skilled in the art can refer to the commonly used techniques in the art for setting, and only need to implement the above corresponding functions.

[0116] It should also be noted that if Fig.15 As shown, in actual implementation, the voltage regulating 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 cycle to control the variable voltage output module 111 to output a variable voltage Vadj to the voltage-to-current conversion unit 124.

[0117] The variable voltage output module 111 may specifically include a resistor RLF and a capacitor CLF, which form a low-pass filter, and may convert the PWM signal output by the control chip into a DC variable voltage Vadj, thereby realizing a DAC (Digital to analog converter) function. The control chip may be implemented by an MCU (Microcontroller Unit), a DSP (Digital Signal Processing), an FPGA (Field Programmable Gate Array), or other integrated chips.

[0118] In this embodiment, assuming that the output voltage of the PWM signal is Vpwm and the duty cycle is D, the variable voltage Vadj=D*Vpwm. It can be seen that the voltage value of the variable voltage Vadj can be changed by changing the duty cycle of the PWM signal. Of course, in actual implementation, the output variable voltage Vadj of the DAC function module of the control chip can also be directly used according to actual needs, and this embodiment does not limit this.

[0119] In one embodiment, Fig.16 As shown, the controllable constant current source 123 includes a current mirror circuit 125, the input side of the current mirror circuit 125 is connected to the voltage regulator controller 110, and the controlled side is connected to the feedback node of the switching power supply module 200. The voltage regulator controller 110 is used to output a gradually changing variable voltage Vadj to the current mirror circuit 125 according to the target voltage, and the current mirror circuit 125 is used to gradually change the current state according to the variable voltage Vadj and the node voltage Vf of the feedback node of the switching power supply module 200.

[0120] Therefore, by continuously changing the current state through the current mirror circuit 125 , the node voltage Vf at the feedback node gradually changes, and finally the stepless regulation of the output voltage of the switching power supply module 200 is achieved.

[0121] Exemplarily, the current mirror circuit 125 includes a switch tube Q5, a switch tube Q6 and a resistor R8, wherein the first end of the resistor R8 serves as the input side of the current mirror circuit 125 and is used to access the variable voltage Vadj. The second end of the resistor R8 is respectively connected to the base of the switch tube Q5, the base of the switch tube Q6 and the collector of the switch tube Q6, the emitter of the switch tube Q6 and the emitter of the switch tube Q5 are both grounded, and the collector of the switch tube Q5 serves as the controlled side of the current mirror circuit 125 and is connected to the feedback node of the switching power supply module 200.

[0122] Specifically, assuming that the emitter junction voltage of the switch tube Q5 and the switch tube Q6 is Vbe, then:

[0123] The constant current value of the constant current source formed by the current mirror circuit 125 is:

[0124] The output voltage Vout of the switching power supply module 200 is:

[0125] Obviously, by continuously and steplessly adjusting the variable voltage Vadj, the constant current value of the constant current source can be adjusted steplessly, thereby continuously and steplessly adjusting the output voltage Vout. In this embodiment, the controllable constant current source is formed by the current mirror, and the control of the constant current value is more accurate, so that the reliability is higher during the adjustment of the output voltage Vout.

[0126] In one embodiment, Fig.17 As shown, the controllable constant current source 123 includes an operational amplifier OPA, a first resistor R9, a second resistor R10 and a regulating switch tube Q7. The non-inverting input terminal of the operational amplifier OPA is connected to the voltage regulating controller 110, the output terminal of the operational amplifier OPA is connected to the base of the regulating switch tube Q7 via the first resistor R9, the collector of the regulating switch tube Q7 is connected to the feedback node of the switching power supply module 200, the emitter of the regulating switch tube Q7 is respectively connected to the inverting input terminal of the operational amplifier OPA and the first end of the second resistor R10, and the second end of the second resistor R10 is grounded.

[0127] 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:

[0128] The output voltage Vout of the switching power supply module 200 is:

[0129]

[0130] In this embodiment, the controllable constant current source composed of the operational amplifier OPA, the first resistor R9, the second resistor R10 and the regulating switch tube Q7 can accurately control the output constant current value, so that the constant current value can be adjusted steplessly, thereby achieving stepless adjustment of the output voltage Vout.

[0131] The specific types and parameters of the above-mentioned switch tubes can be set according to actual needs. The controllable constant current source 123 can also adopt other forms, not limited to the forms mentioned in the above embodiments, as long as it can achieve the corresponding functions.

[0132] The power feedback control circuit 100 can control the output voltage of the switching power supply module of various resonant conversion topologies according to the needs of the power-consuming equipment by adjusting the node voltage of the feedback node of the switching power supply module 200. Thus, multiple DC-DC conversion modules at the back end of the resonant conversion topology can be omitted, which greatly simplifies the circuit structure. At the same time, the volume of the charging equipment can be reduced to meet the demand for the development of fast charging products to small volumes. Furthermore, by steplessly adjusting the node voltage Vf of the feedback node of the switching power supply module 200, the output voltage Vout of the switching power supply module 200 can be steplessly regulated, which solves the problem of large current impact when the power change module 200 switches the output voltage quickly, making the use of the switching power supply module 200 safer and more reliable, and reducing the product failure rate.

[0133] The embodiment of the present application further provides a switching power supply, including a switching power supply module and a power feedback control circuit. The power feedback control circuit can be configured with reference to the power feedback control circuit 100 in the above embodiments.

[0134] In one embodiment, continue to refer to Figure 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 respectively connected to the power conversion module 210 and the feedback circuit 220; wherein the feedback node of the feedback circuit 220 serves as the feedback node of the switching power supply module 200. The voltage regulator controller 110 in the power supply feedback control circuit 100 is used to obtain the target voltage of the target load, and based on the target voltage, adjust the circuit state of the voltage regulator circuit 120 to adjust the voltage of the feedback node to a feedback voltage corresponding to the target voltage. The feedback circuit 220 is used to generate a feedback signal according to the feedback voltage, and send the feedback signal to the power supply controller 230. The power supply controller 230 is used to control the power conversion module 210 according to the feedback signal so that the power conversion module 210 outputs the target voltage.

[0135] 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 refer to Figure 4 The embodiment shown is set, and it can also be set according to Figure 4 The embodiment shown is adaptively adjusted. The structure of the power controller 230 is specifically set according to the requirements. It can be understood that in actual implementation, the structure of the switching power module can also be adaptively adjusted according to the actual situation, for example, it can also include filtering modules.

[0136] In one embodiment, the voltage regulator controller 110 in the power feedback control circuit 100 is used to gradually change the circuit state of the voltage regulator circuit 120 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 used to generate a feedback signal according to the gradually changing node voltage of the feedback node, and send the feedback signal to the power controller 230. The power controller 230 is used 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.

[0137] In this embodiment, the power feedback control circuit 100 performs stepless regulation on the node voltage of the feedback node, so that the output voltage Vout of the power conversion module 210 can be steplessly regulated. Since the output voltage Vout is continuously regulated, there is no sudden change in the output voltage, and there is no large current impact in the power change module 210 of the switching power supply module 200, so that the reliability of the switching power supply module 200 is higher.

[0138] An embodiment of the present application further provides an electronic device, including a switching power supply, and the structure of the switching power supply can be configured with reference to the above embodiment.

[0139] In one embodiment, the electronic device is a charging device, the charging device includes an output interface, and obtaining the target voltage of the target load includes: obtaining a required charging voltage of a device connected to the output interface.

[0140] Specifically, the electronic device may be a charging device such as an adapter, a charger or similar function, and its output interface is used to connect a device to be charged, wherein obtaining the target voltage of the target load includes: obtaining the required charging voltage of the device connected to the output interface, and the method of obtaining the target voltage of the target load does not need to be limited. Those skilled in the art can make settings with reference to the commonly used techniques in the field, and only need to implement the above-mentioned corresponding functions.

[0141] The present application also provides a power supply feedback control method, which can be applied to Figure 1 In the power supply feedback control circuit 100 shown, the voltage regulator controller 110 is used to obtain the target voltage of the target load; based on the target voltage, the circuit state of the voltage regulator circuit 120 is adjusted to adjust 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.

[0142] In one embodiment, Fig.18 As shown, a power supply feedback control method is provided, which is applied to Figure 1 The voltage regulating controller 110 in FIG. 1 is taken as an example to illustrate, including the following steps 300 and 400.

[0143] Step 300, obtaining a target voltage of a target load.

[0144] The target load is a device that needs to be powered by the output voltage. The voltage regulator controller does not need to be limited in the way it obtains the target voltage of the target load. The voltage regulator controller can communicate with the target load and receive the power consumption agreement sent by the target load to determine the target voltage. Alternatively, the user can directly input the target voltage of the target load through the interactive module of the voltage regulator controller.

[0145] Step 400, based on the target voltage, adjust the circuit state of the voltage regulating circuit to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node. The specific adjustment principle can refer to the above-mentioned embodiments of the power feedback control circuit 100, and will not be repeated in this embodiment.

[0146] In one embodiment, in step 400, based on the target voltage, adjusting the circuit state of the voltage regulating circuit to adjust the voltage of the feedback node of the switching power supply module specifically includes:

[0147] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to change gradually, so as to perform stepless regulation on the node voltage of the feedback node.

[0148] Therefore, by steplessly adjusting the node voltage of the feedback node, the output voltage of the switching power supply module can be steplessly adjusted. Since the output voltage is continuously regulated, there is no sudden change in the output voltage, and there is no large current impact in the power change module of the switching power supply module, making the switching power supply module more reliable.

[0149] Based on the same inventive concept, the embodiment of the present application also provides a power feedback control device for implementing the power feedback control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more power feedback control device embodiments provided below can refer to the limitations of the power feedback control method above, and will not be repeated here.

[0150] In one embodiment, Fig.19 As shown, a power supply feedback control device is provided, comprising: a voltage acquisition module 500 and an adjustment module 600, wherein:

[0151] A voltage acquisition module 500 is used to acquire a target voltage of a target load;

[0152] The adjustment module 600 is used to adjust the circuit state of the voltage regulating circuit based on the target voltage to adjust the voltage of the feedback node of the feedback circuit of the switching power module so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0153] In one embodiment, the adjustment module 600 is further configured to adjust the circuit state of the voltage regulation circuit to gradually change based on the target voltage, so as to perform stepless regulation on the node voltage of the feedback node.

[0154] Each module in the above power feedback control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0155] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0156] Obtaining a target voltage of a target load;

[0157] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0158] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: based on the target voltage, adjusting the circuit state of the voltage regulating circuit to gradually change, so as to perform stepless regulation on the node voltage of the feedback node.

[0159] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0160] Obtaining a target voltage of a target load;

[0161] Based on the target voltage, the circuit state of the voltage regulating circuit is adjusted to adjust the voltage of the feedback node of the feedback circuit of the switching power module, so that the switching power module outputs the target voltage according to the voltage of the feedback node.

[0162] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: based on the target voltage, adjusting the circuit state of the voltage regulating circuit to gradually change, so as to perform stepless regulation on the node voltage of the feedback node.

[0163] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0164] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0165] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power supply feedback control circuit, characterized in that: Used to connect to the switching power supply module; the power supply feedback control circuit includes a voltage regulator controller and a voltage regulator circuit connected to each other, and the voltage regulator circuit is connected to the feedback node of the feedback circuit of the switching power supply module: The voltage regulator controller is used to obtain a target voltage of a target load and adjust a circuit state of the voltage regulator circuit based on the target voltage 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.

2. The power supply feedback control circuit according to claim 1, characterized in that: The voltage regulating controller adjusts the circuit state of the voltage regulating circuit to change gradually during 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.

3. The power supply feedback control circuit according to claim 2, characterized in that: The voltage regulating controller outputs a PWM signal to the regulating circuit, which is used to control the regulating circuit to change its own equivalent resistance or current parameter.

4. The power supply feedback control circuit according to claim 2, characterized in that: The voltage regulating circuit comprises a voltage dividing unit and a voltage regulating switch, one end of the voltage dividing unit is connected to the feedback node of the feedback circuit of the switching power supply module, and the other end is grounded through the voltage regulating switch, and the controlled end of the voltage regulating switch is connected to the voltage regulating controller; The voltage regulating controller is used to control the on-time of the voltage regulating switch at a preset switching frequency to gradually change according to the target voltage, and adjust the resistance state of the voltage dividing unit to gradually change, so as to steplessly regulate the node voltage of the feedback node.

5. The power supply feedback control circuit according to claim 4, characterized in that: The voltage regulating controller is used to determine the preset switching frequency, initial duty cycle and target duty cycle of the PWM signal according to the target voltage, and output a PWM signal with a gradually changing duty cycle to the voltage regulating switch; 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.

6. The power supply feedback control circuit according to claim 2, characterized in that: The voltage regulation circuit comprises a controllable constant current source connected to the voltage regulation controller, and the controllable constant current source is connected to a feedback node of a feedback circuit of the switching power supply module; The voltage regulating controller is used to control the current state of the controllable constant current source to gradually change according to the target voltage, so as to perform stepless regulation on the node voltage of the feedback node.

7. The power supply feedback control circuit according to claim 6, characterized in that: The controllable constant current source comprises a voltage-current conversion unit, one end of which is connected to the voltage regulating controller, and the other end of which is connected to the feedback node of the feedback circuit of the switching power supply module; The voltage regulating controller is used to output a gradually changing variable voltage to the voltage-to-current conversion unit according to the target voltage; The voltage-to-current conversion unit is used to gradually change the current state according to the variable voltage and the voltage of the feedback node.

8. The power supply feedback control circuit according to claim 6, characterized in that: The controllable constant current source comprises a current mirror circuit, the input side of the current mirror circuit is connected to the voltage regulator controller, and the controlled side is connected to the feedback node of the feedback circuit of the switching power supply module; The voltage regulating controller is used to output a gradually changing variable voltage to the current mirror circuit according to the target voltage; The current mirror circuit is used to gradually change the current state according to the variable voltage and the voltage of the feedback node.

9. The power supply feedback control circuit according to claim 6, characterized in that: The controllable constant current source includes an operational amplifier, a first resistor, a second resistor and a regulating switch tube. The non-inverting input terminal of the operational amplifier is connected to the voltage regulating controller, the output terminal of the operational amplifier is connected to the base of the regulating switch tube via the first resistor, the collector of the regulating switch tube is connected to the feedback node of the feedback circuit of the switching power supply module, the emitter of the regulating switch tube is respectively connected to the inverting input terminal 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, characterized in that: include: A switching power supply module and a power supply feedback control circuit as claimed in any one of claims 1 to 9.

11. The switching power supply according to claim 10, characterized in that: The switching power supply module comprises: a power conversion module, a feedback circuit connected to the power conversion module, and a power supply controller connected to the power conversion module and the feedback circuit respectively; The voltage regulating controller is used to obtain a target voltage of a target load, and based on the target voltage, adjust a circuit state of the voltage regulating circuit to adjust the voltage of the feedback node to a feedback voltage corresponding to the target voltage; The feedback circuit is used to generate a feedback signal according to the feedback voltage, and send the feedback signal to the power controller; The power supply controller is used to control the power conversion module according to the feedback signal so that the power conversion module outputs the target voltage.

12. The switching power supply according to claim 11, characterized in that: The voltage regulating controller is used to adjust 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; The feedback circuit is used to generate a feedback signal according to the gradually changing node voltage of the feedback node, and send the feedback signal to the power controller; The power supply controller is used to control the power conversion module according to the feedback signal so that the output voltage of the power conversion module gradually changes to the target voltage.

13. An electronic device, characterized in that: A switching power supply comprising the switching power supply as claimed in any one of claims 10 to 12.

14. The electronic device according to claim 13, characterized in that: The electronic device is a charging device, and the charging device includes an output interface. The acquiring the target voltage of the target load includes: acquiring the required charging voltage of the device connected to the output interface.

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