Switching power supply circuit, chip and electronic equipment

Abstract

The invention discloses a switching power supply circuit, a chip and electronic equipment, and belongs to the technical field of electronic circuits. The circuit comprises a conversion module, a feedback module, an adjusting module and a control module. The conversion module is used for converting the input voltage into output voltage; the feedback module is connected with the conversion module and the control module and is used for outputting first voltage to the control module according to the output voltage; the adjusting module is connected with the control module and used for switching a second voltage provided for the control module into a third voltage based on the change of the output voltage, and the second voltage is different from the third voltage; and the control module is connected with the conversion module and used for stabilizing the output voltage according to the first voltage and the third voltage. When the output voltage changes, the voltage provided for the control module is switched, the voltage stabilizing speed of the output voltage is increased through the voltage, and the transient response of the circuit is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and in particular to a switching power supply circuit, a chip, and an electronic device. Background Art

[0002] A switching power supply circuit is an electric energy conversion circuit that achieves at least one of boosting or reducing the voltage by switching the state of the switch tube at a high frequency. The switching power supply circuit can convert the input voltage into an output voltage and supply power to the load through the output voltage. During the operation of the electronic device, the load current or input voltage may change, and this change will cause the output voltage to change. The switching power supply circuit itself can adjust the output voltage to restore the output voltage to stability. The process of restoring the output voltage to stability is called transient response, and how to improve the transient response of the switching power supply circuit has become an urgent problem to be solved. Summary of the invention

[0003] The present application provides a switching power supply circuit, a chip and an electronic device, which can be used to solve the problems in the related technology. The technical solution includes the following contents.

[0004] In a first aspect, a switching power supply circuit is provided, the circuit comprising a conversion module, a feedback module, a regulation module and a control module;

[0005] The conversion module is used to convert the input voltage into the output voltage;

[0006] The feedback module is connected to the conversion module and the control module, and is used to output a first voltage to the control module according to the output voltage;

[0007] The regulating module is connected to the control module and is used to switch the second voltage provided to the control module to a third voltage based on the change of the output voltage, wherein the second voltage is different from the third voltage;

[0008] The control module is connected to the conversion module, and is used to stabilize the output voltage according to the first voltage and the third voltage.

[0009] In a possible implementation, the regulating module includes a first output component and a second output component, and the first output component and the second output component are both connected to the control module;

[0010] The first output component is used to provide the second voltage to the control module before the output voltage changes;

[0011] The second output component is used to provide the third voltage to the control module after the output voltage changes.

[0012] In a possible implementation, the first output component includes a first switch and a first capacitor, one end of the first switch is connected to the control module, and the other end of the first switch is connected to the first capacitor;

[0013] The first switch is configured to be in a closed state before the output voltage changes, and to be in an open state after the output voltage changes;

[0014] The first capacitor is used to provide the second voltage to the control module when the first switch is in a closed state;

[0015] The second output component includes a second switch and a second capacitor, one end of the second switch is connected to the control module, and the other end of the second switch is connected to the second capacitor;

[0016] The second switch is configured to be in an open state before the output voltage changes, and to be in a closed state after the output voltage changes;

[0017] The second capacitor is used to provide the third voltage to the control module when the second switch is in a closed state.

[0018] In a possible implementation, the first switch is used to connect to a first signal generating module, receive a first flag signal generated by the first signal generating module, and be closed or opened under the control of the first flag signal, wherein before the output voltage changes, the first flag signal indicates that the first switch is closed, and after the output voltage changes, the first flag signal indicates that the first switch is opened;

[0019] The second switch is used to connect to the second signal generating module, receive the second flag signal generated by the second signal generating module, and close or open under the control of the second flag signal, wherein before the output voltage changes, the second flag signal indicates that the second switch is opened, and after the output voltage changes, the second flag signal indicates that the second switch is closed.

[0020] In a possible implementation manner, the first flag signal includes a frame start pulse signal or a clock signal; or, the second flag signal includes the frame start pulse signal or the clock signal.

[0021] In a possible implementation, the circuit further includes a detection module;

[0022] The detection module is connected to the conversion module and is used to detect the change of the output voltage and generate a first flag signal and a second flag signal according to the change;

[0023] The detection module is connected to the first switch and the second switch respectively, and is further used to transmit the first flag signal to the first switch and transmit the second flag signal to the second switch;

[0024] Before the output voltage changes, the first flag signal indicates that the first switch is closed, and the second flag signal indicates that the second switch is opened; after the output voltage changes, the first flag signal indicates that the first switch is opened, and the second flag signal indicates that the second switch is closed.

[0025] In a possible implementation, the control module includes a sampling component and a regulating component;

[0026] The sampling component is connected to the regulating component and the conversion module, and is used to sample the first current of the switch tube in the conversion module and output a fourth voltage to the regulating component;

[0027] The regulating component is used to stabilize the output voltage according to the first voltage, the third voltage and the fourth voltage.

[0028] In a possible implementation, the sampling component includes a resistor and a current sensor, the resistor is connected in series between the switch tube and a ground terminal, wherein the resistor is used to adjust a resistance value based on a change in the output voltage;

[0029] One end of the current sensor is connected to the series node between the resistor and the switch tube, and the other end of the current sensor is connected to the regulating component, for sampling the first current of the series node and outputting the fourth voltage to the regulating component according to the first current.

[0030] In a second aspect, a chip is provided, wherein the chip includes the switching power supply circuit provided in the first aspect and any possible implementation manner.

[0031] According to a third aspect, an electronic device is provided, wherein the electronic device comprises the switching power supply circuit provided according to the second aspect.

[0032] The technical solution provided by this application brings at least the following beneficial effects:

[0033] In the circuit provided by the present application, the regulating module can switch the voltage provided to the control module when the output voltage changes, so that the control module can quickly stabilize the output voltage according to the switched voltage, i.e., the third voltage. By accelerating the stabilization speed of the output voltage, the recovery time of the output voltage is reduced, the transient response of the switching power supply circuit is improved, and thus the performance of the switching power supply circuit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be 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.

[0035] Figure 1 It is a structural schematic diagram of a boost circuit provided by the related technology;

[0036] Figure 2 It is a signal schematic diagram of a boost circuit provided by the related technology;

[0037] Figure 3 is a structural schematic diagram of a switching power supply circuit provided in an embodiment of the present application;

[0038] Figure 4 is a structural schematic diagram of a switching power supply circuit provided in an embodiment of the present application;

[0039] Figure 5 It is a structural schematic diagram of a regulating module provided in an embodiment of the present application;

[0040] Figure 6 is a signal change schematic diagram provided in an embodiment of the present application;

[0041] Figure 7 is a schematic diagram of a detection module provided in an embodiment of the present application;

[0042] Figure 8 It is a signal schematic diagram of a switching power supply circuit provided in an embodiment of the present application;

[0043] Fig. 9 is a schematic diagram of the structure of a chip provided in an embodiment of the present application;

[0044] Fig.10 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0046] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0047] In the field of electronic circuit technology, a switching power supply circuit is a common power conversion circuit that achieves at least one of boosting or reducing voltage by switching the state of a switch tube at a high frequency. In practical applications, there are many structures of switching power supply circuits. The following only takes the switching power supply circuit as a boost circuit as an example to explain its implementation principle. The implementation methods when the switching power supply circuit is other circuits will not be repeated here.

[0048] like Figure 1 As shown, Figure 1 It is a schematic diagram of the structure of a boost circuit. As the name implies, a boost circuit is a switching power supply circuit used for boosting. The input voltage of the boost circuit is Vin, the output voltage is Vout, and the output voltage Vout is greater than the input voltage Vin.

[0049] Optionally, the input voltage Vin is provided by the power supply 1. The boost circuit includes an inductor L, the voltage at one end of the inductor L is the input voltage Vin, and the other end of the inductor L is respectively connected to the collector of the switch tube S1 and one end of the diode S2. Since the inductor L has the characteristic of hindering current changes. Based on this, when the switch tube S1 is turned on, the current in the inductor L increases. Since the self-inductance of the inductor L hinders the current from rising, the inductor L can convert electrical energy into magnetic energy and store it. When the switch tube S1 is turned off, the current in the inductor L decreases. Since the self-inductance of the inductor L hinders the current from decreasing, the inductor L can convert magnetic energy into electrical energy. Based on this, the inductor L can boost the input voltage Vin to obtain the inductor voltage Vsw, and the inductor voltage Vsw is greater than the input voltage Vin. Simply put, since the inductor L has the characteristic of hindering current changes, when the high-frequency switching switch tube S1 is turned on and off, the current of the inductor L will change, so that the inductor L can output the inductor voltage Vsw according to the input voltage Vin, and the inductor voltage Vsw is greater than the input voltage Vin. Among them, the other end of the diode S2 is connected to one end of the capacitor Cout, and the other end of the capacitor Cout is grounded. The diode S2 receives the inductor voltage Vsw and provides the output voltage Vout to the capacitor Cout. The capacitor Cout is used to store electrical energy. The output voltage Vout can supply power to the load Rload. Optionally, the diode S2 is mainly used to prevent the capacitor Cout from discharging to the ground when the switch tube S1 is turned on. The voltage difference across the diode S2 can be regarded as 0. Based on this, the output voltage Vout is equal to the inductor voltage Vsw.

[0050] When the boost circuit is in steady state, the output voltage Vout remains unchanged. The boost circuit also includes a sampling resistor R1 and a sampling resistor R2 connected in series. One end of the sampling resistor R1 is connected to the series node of the diode S2 and the capacitor Cout, and is used to receive the output voltage Vout. The other end of the sampling resistor R1 is connected to one end of the sampling resistor R2, and the other end of the sampling resistor R2 is grounded. The connection node between the sampling resistor R2 and the sampling resistor R1 is connected to the negative input terminal (i.e., the inverting input terminal, referred to as the negative terminal) of the error amplifier EA. After the output voltage Vout is sampled by the sampling resistor R1 and the sampling resistor R2, a feedback voltage VFB is obtained, and the feedback voltage VFB is input to the negative terminal of the error amplifier EA. The positive input terminal (i.e., the in-phase input terminal, referred to as the positive terminal) of the error amplifier EA is connected to the power supply 2, and the power supply 2 is used to provide a reference voltage VREF input to the positive terminal of the error amplifier EA. The error amplifier EA is used to calculate the error between the feedback voltage VFB and the reference voltage VREF, amplify the error, and output the control voltage Vc.

[0051] The boost circuit also includes a comparator CMP. The positive terminal of the comparator CMP is connected to the output terminal of the error amplifier EA, and is used to receive a control voltage Vc, wherein the control voltage Vc is also called the positive input voltage of the comparator CMP. The negative terminal of the comparator CMP is used to receive a negative input voltage Vd. The negative input voltage Vd is determined as follows: the current of the resistor Rsense is sampled by a current sensor to obtain a sampling current, and the sampling current can be converted into a sampling voltage, and the sampling voltage can be the negative input voltage Vd, or the negative input voltage Vd can be obtained by acting a sawtooth signal on the sampling voltage.

[0052] Among them, one end of the resistor Rsense is grounded, the other end of the resistor Rsense is connected to the emitter of the switch tube S1, and the connection node between the resistor Rsense and the emitter of the switch tube S1 is connected to the current sensor. Since the switch tube S1 is constantly switched between on and off, when the switch tube S1 is turned on, the current of the resistor Rsense is the current flowing through the switch tube S1. When the switch tube S1 is turned off, since the switch tube S1 is not turned on, there is no current in the resistor Rsense. Optionally, the current sensor samples when the switch tube S1 is turned on, and does not sample when the switch tube S1 is turned off. Based on this, the sampled current and its corresponding sampled voltage are both sawtooth signals, and another sawtooth signal can be used to act on the sampled voltage to make the negative input voltage of the comparator CMP more stable.

[0053] The comparator CMP is used to compare the positive input voltage Vc and the negative input voltage Vd. Whenever the negative input voltage Vd is equal to the positive input voltage Vc, the voltage output by the comparator CMP is flipped, that is, the high level is flipped to the low level, or the low level is flipped to the high level. By continuously flipping the output voltage of the comparator CMP, a pulse signal is obtained. The output end of the comparator CMP is connected to the controller, and the controller is connected to the base of the switch tube S1. The controller can control the on and off of the switch tube S1 according to the pulse signal. For example, when the pulse signal is at a high level, the controller controls the switch tube S1 to turn on; when the pulse signal is at a low level, the controller controls the switch tube S1 to turn off. Alternatively, when the pulse signal is at a low level, the controller controls the switch tube S1 to turn on; when the pulse signal is at a high level, the controller controls the switch tube S1 to turn off.

[0054] like Figure 2As shown, when the boost circuit is in a steady state, the output voltage Vout remains unchanged, and the output voltage Vout can stably supply power to the load Rload, so that the load current remains unchanged. Since the state of the switch tube S1 needs to be switched at a high frequency, and the inductor L will hinder the current change due to the self-inductance, the inductor current periodically repeats the change of increase and decrease. In addition, when the switch tube S1 is in the on state, the current sensor can collect the current of the resistor Rsense; when the switch tube S1 is in the off state, the current sensor can collect or not collect the current of the resistor Rsense. Among them, the negative input voltage Vd of the comparator CMP can be determined according to the collected current, and the negative input voltage Vd periodically repeats the change of increase and decrease, and since the output voltage Vout remains unchanged, the positive input voltage Vc of the comparator CMP remains unchanged. Whenever the negative input voltage Vd is equal to the positive input voltage Vc, the output voltage of the comparator CMP flips, thereby obtaining a pulse signal, so as to switch the switch tube S1 on and off through the pulse signal.

[0055] In the field of semiconductor integrated circuits, a transient increase in the load current of a load Rload is often referred to as a change from a light load to a heavy load. Conversely, a transient decrease in the load current of the load Rload is referred to as a change from a heavy load to a light load.

[0056] When the load current of the load Rload increases transiently, the switching power supply circuit does not have time to respond, so the capacitor Cout discharges, causing the output voltage Vout to drop. After the output voltage Vout is sampled by the sampling resistor R1 and the sampling resistor R2, the feedback voltage VFB is obtained. As the output voltage Vout drops, the feedback voltage VFB drops, while the reference voltage VREF remains unchanged, so the control voltage Vc increases. As the positive input voltage Vc of the comparator CMP increases, the inductor L needs to accumulate more electrical energy to increase the inductor current, thereby increasing the current flowing through the switch tube S1 (i.e., the sampling current of the resistor Rsense), and then increasing the negative input voltage Vd, so that the output voltage of the comparator CMP is flipped. By continuously flipping the output voltage of the comparator CMP, a pulse signal is formed to control the on and off of the switch tube S1 through the pulse signal. In addition, as the inductor current increases, the capacitor Cout is charged, thereby gradually restoring the output voltage Vout.

[0057] like Figure 2As shown in the figure, when the load current increases, the output voltage Vout decreases, causing the positive input voltage Vc to increase. In this case, the inductor L needs to store more electrical energy to increase the inductor current, thereby increasing the negative input voltage Vd. When the negative input voltage Vd is equal to the positive input voltage Vc, the output voltage of the comparator CMP flips, and the state of the switch tube S1 changes. In this process, the inductor current increases, causing the output voltage Vout to gradually return to stability.

[0058] On the contrary, when the load current of the load Rload decreases transiently, since the switching power supply circuit does not have time to respond, the capacitor Cout is charged, resulting in an increase in the output voltage Vout. After the output voltage Vout is sampled by the sampling resistor R1 and the sampling resistor R2, the feedback voltage VFB is obtained. As the output voltage Vout increases, the feedback voltage VFB increases, while the reference voltage VREF remains unchanged, so the control voltage Vc decreases. Since the positive input voltage Vc of the comparator CMP decreases, the inductor L only needs to accumulate a small amount of electric energy to reduce the inductor current, thereby reducing the current flowing through the switch tube S1 (i.e., the sampling current of the resistor Rsense), and then reducing the negative input voltage Vd, so that the output voltage of the comparator CMP is flipped. By continuously flipping the output voltage of the comparator CMP, a pulse signal is formed to control the on and off of the switch tube S1 through the pulse signal. In addition, due to the reduction of the inductor current, the capacitor Cout is discharged, thereby gradually restoring the output voltage Vout.

[0059] Based on the above, it can be seen that when the load current of the switching power supply circuit changes, the output voltage will change, and the switching power supply circuit needs a long time to recover the output voltage, resulting in poor transient response of the circuit and affecting the circuit performance. Based on this, the embodiment of the present application provides a switching power supply circuit, which can reduce the recovery time of the output voltage, improve the transient response of the circuit, and thus improve the circuit performance.

[0060] The present application embodiment provides a switching power supply circuit, such as Figure 3 As shown, the switching power supply circuit includes a conversion module 10, a feedback module 20, a regulation module 30 and a control module 40. Among them, Figure 3 The white circle in the figure represents the output terminal, and the black circle represents the input terminal.

[0061] In an exemplary embodiment, a conversion module 10 is used to convert an input voltage into an output voltage Vout. A feedback module 20 is connected to the conversion module 10 and the control module 40, and is used to output a first voltage to the control module 40 according to the output voltage Vout. A regulating module 30 is connected to the control module 40, and is used to switch a second voltage provided to the control module 40 to a third voltage based on a change in the output voltage, wherein the second voltage and the third voltage are different; and a control module 40 is connected to the conversion module 10, and is used to stabilize the output voltage Vout according to the first voltage and the third voltage.

[0062] It should be noted that the switching power supply circuit of the embodiment of the present application is an electric energy conversion circuit, which realizes at least one of boosting or reducing voltage by switching the state of the switch tube at a high frequency. Among them, the switching power supply circuit for realizing boosting includes a boost chopper circuit (Boost Chopper), which can be referred to as a BOOST circuit; the switching power supply circuit for realizing reducing voltage includes a buck circuit (Buck Circuit), which can be referred to as a BUCK circuit; the switching power supply circuit for realizing boosting and reducing voltage includes a BUCK-BOOST circuit.

[0063] It is understandable that the principles of boosting and bucking are similar in different circuits. The implementation of the embodiment of the present application is described below using the BOOST circuit as an example, but this does not limit the embodiment of the present application to only the BOOST circuit. In practical applications, the embodiment of the present application can also be applied to switching power supply circuits such as BUCK circuits and BUCK-BOOST circuits.

[0064] In this example, the conversion module 10 can receive an input voltage and convert the input voltage into an output voltage Vout, and the output voltage Vout is used to power the load Rload. Figure 3 As shown, one end of the load Rload is connected to the output end of the conversion module 10, so that the conversion module 10 can provide an output voltage Vout for the load Rload. The other end of the load Rload is grounded. The load can be a circuit or a component, for example, the load includes components such as a resistor and a light bulb. It can be understood that if the switching power supply circuit can achieve boost, the output voltage Vout can be greater than the input voltage; if the switching power supply circuit can achieve buck, the output voltage Vout can be less than the input voltage.

[0065] Switching power supply circuits with different functions may correspond to conversion modules 10 with different structures and implementation principles. The structure and implementation principle of the conversion module 10 are described below using the BOOST circuit as an example. The structures and implementation principles of the conversion modules 10 in other switching power supply circuits such as the BUCK circuit and the BUCK-BOOST circuit are not described here.

[0066] like Figure 4 As shown, the conversion module 10 includes an inductor L, a switch tube S1, a diode S2 and a capacitor Cout. The voltage at one end of the inductor L is the input voltage Vin, and the other end of the inductor L is respectively connected to the collector of the switch tube S1 and one end of the diode S2. Since the inductor L has the characteristic of hindering current changes. Based on this, when the switch tube S1 is turned on, the current in the inductor L increases. Since the self-inductance of the inductor L hinders the current from rising, the inductor L can convert electrical energy into magnetic energy and store it. When the switch tube S1 is turned off, the current in the inductor L decreases. Since the self-inductance of the inductor L hinders the current from decreasing, the inductor L can convert magnetic energy into electrical energy. Based on this, the inductor L can boost the input voltage Vin to obtain the inductor voltage Vsw, and the inductor voltage Vsw is greater than the input voltage Vin. Simply put, since the inductor L has the characteristic of hindering current changes, when the high-frequency switching switch tube S1 is turned on and off, the current of the inductor L will change, so that the inductor L can output the inductor voltage Vsw according to the input voltage Vin, and the inductor voltage Vsw is greater than the input voltage Vin. Among them, the other end of the diode S2 is connected to one end of the capacitor Cout, and the other end of the capacitor Cout is grounded. The diode S2 receives the inductor voltage Vsw and provides the output voltage Vout to the capacitor Cout. The capacitor Cout is used to store electrical energy. The output voltage Vout can supply power to the load Rload. Optionally, the diode S2 is mainly used to prevent the capacitor Cout from discharging to the ground when the switch tube S1 is turned on. The voltage difference across the diode S2 can be regarded as 0. Based on this, the output voltage Vout is equal to the inductor voltage Vsw.

[0067] Since the conversion module 10 is used to convert the input voltage Vin into the output voltage Vout, and the output voltage Vout is used to power the load Rload, the output voltage Vout will also change if at least one of the input voltage Vin or the load current of the load Rload changes. Optionally, the output voltage Vout decreases if at least one of the following changes occurs: the load current transiently increases, the input voltage Vin transiently decreases; conversely, the output voltage Vout increases if at least one of the following changes occurs: the load current transiently decreases, the input voltage Vin transiently increases.

[0068] The input end of the feedback module 20 is connected to the output end of the conversion module 10. The feedback module 20 can receive the output voltage Vout provided by the conversion module 10 and output the first voltage VC according to the output voltage Vout. Figure 4 As shown, the feedback module 20 includes a sampling module 201 and an error amplifier EA.

[0069] Among them, the sampling module 201 is connected to the output end of the conversion module 10 for receiving the output voltage Vout, and the sampling module 201 is connected to the negative end of the error amplifier EA for providing a feedback voltage VFB to the negative end of the error amplifier EA. The embodiment of the present application does not limit the structure of the sampling module 201. Exemplarily, the sampling module is a resistive sampling circuit, which includes a plurality of resistors connected in series, and the voltage after the output voltage Vout passes through at least one resistor is the feedback voltage VFB, and the feedback voltage VFB is less than the output voltage Vout.

[0070] like Figure 4 As shown, the sampling module 201 includes a resistor R1 and a resistor R2, and the voltage after the output voltage Vout passes through the resistor R1 is the feedback voltage VFB. Since the voltage at one end of the sampling module 201 is the output voltage Vout, the other end of the sampling module 201 is grounded (i.e., the voltage is 0). Based on this, the feedback voltage VFB satisfies: In practical applications, the other end of the sampling module 201 may not be grounded, but may be connected to other circuits, which is not limited here.

[0071] In practical applications, the sampling module 201 may also be a capacitive sampling circuit, which includes a capacitor and a resistor, wherein the capacitor and the resistor are connected in series. The output voltage Vout may act on the capacitor, and the capacitor may store charge, thereby generating a sampling effect and obtaining a feedback voltage VFB.

[0072] The positive terminal of the error amplifier EA is used to receive the reference voltage VREF. The generation method of the reference voltage VREF is not limited here. For example, Figure 4 As shown, the reference voltage VREF is provided to the positive terminal of the error amplifier EA by the power supply 2. In practical applications, the reference voltage VREF can also be provided to the positive terminal of the error amplifier EA by other components or circuits. The error amplifier EA is used to calculate the error between the feedback voltage VFB and the reference voltage VREF, amplify the error, and output the first voltage VC. Among them, if the output voltage Vout is stable, the first voltage VC will not change. If the output voltage Vout decreases, the feedback voltage VFB decreases, causing the first voltage VC to increase. If the output voltage Vout increases, the feedback voltage VFB increases, causing the first voltage VC to decrease.

[0073] In this example, if Figure 4As shown, the switching power supply circuit also includes a regulating module 30. Before the output voltage Vout changes, that is, before the output voltage Vout decreases or increases, the regulating module 30 provides a second voltage V3-1. After the output voltage Vout changes, that is, after the output voltage Vout decreases or increases, the regulating module 30 provides a third voltage V3-2. The second voltage V3-1 and the third voltage V3-2 are different. If the output voltage Vout decreases, the third voltage V3-2 is greater than the second voltage V3-1; if the output voltage Vout increases, the third voltage V3-2 is less than the second voltage V3-1.

[0074] Alternatively, if Figure 4 As shown, the regulating module 30 includes a first output component 301 and a second output component 302, and both the first output component 301 and the second output component 302 are connected to the control module 40; the first output component 301 is used to provide the second voltage V3-1 to the control module 40 before the output voltage Vout changes. The second output component 302 is used to provide the third voltage V3-2 to the control module 40 after the output voltage Vout changes.

[0075] That is, the adjustment module 30 includes at least two output components, and the first output component 301 and the second output component 302 are different output components among the at least two output components. Figure 5 As shown, the regulation module 30 includes five groups of output components 300. The first output component 301 can be any group of output components 300 in the five groups of output components 300, for example, the second group of output components 300 is the first output component 301. The second output component 302 can be any group of output components 300 in the five groups of output components 300 except the first output component 301, for example, the fourth group of output components 300 is the second output component 302. Different output components can provide different voltages, such as Figure 5 The voltages provided by the various groups of output components 300 shown are different. That is, the first output component 301 can provide a second voltage V3-1, the second output component 302 can provide a third voltage V3-2, and other output components except the first output component 301 and the second output component 302 can provide voltages different from the second voltage V3-1 and the third voltage V3-2.

[0076] In an embodiment of the present application, the input voltage Vin has a voltage variation interval, and the load current has a current variation interval. As long as the input voltage Vin belongs to the voltage variation interval and the load current belongs to the current variation interval, the switching power supply circuit can provide a stable output voltage Vout to the load Rload. The voltage variation interval can be divided into at least two voltage variation sub-intervals, and the current variation interval can be divided into at least two current variation sub-intervals. When the input voltage Vin of the switching power supply circuit belongs to a voltage variation sub-interval, and the load current belongs to a current variation sub-interval, it is considered that the switching power supply circuit operates in one scenario. Based on this, the switching power supply circuit can operate in multiple scenarios, one working scenario corresponds to a voltage variation sub-interval and a current variation sub-interval, and different working scenarios correspond to different voltage variation sub-intervals and / or different current variation sub-intervals.

[0077] The change in output voltage Vout can be regarded as the switching power supply circuit switching from one working scenario to another. For example, the load current changes from light load to heavy load, and the load current changes from heavy load to light load, which can be regarded as the switching power supply circuit switching between two working scenarios. Different output components correspond to different working scenarios, such as Figure 5 The working scenarios corresponding to the groups of output components 300 shown are different.

[0078] It is understandable that when the switching power supply circuit is in a steady state in a working scenario, the voltage provided by the corresponding output component remains unchanged. Based on this, different output components provide different voltages. Before the output voltage Vout changes, the switching power supply circuit is in the working scenario corresponding to the first output component 301, and at this time, the first output component 301 provides the second voltage V3-1. In other words, the second voltage V3-1 is equal to the voltage provided by the first output component 301 when the switching power supply circuit is in a steady state in the working scenario corresponding to the first output component 301. After the output voltage Vout changes, the switching power supply circuit is in the working scenario corresponding to the second output component 302, and at this time, the second output component 302 provides a third voltage V3-2. Among them, the third voltage V3-2 is equal to the voltage provided by the second output component 302 when the switching power supply circuit is in a steady state in the working scenario corresponding to the second output component 302.

[0079] In practical applications, such as Figure 5 As shown, the i-th (i is a positive integer) output component 300 includes a switch S3-i and a capacitor C3-i, one end of the switch S3-i is connected to the control module 40, the other end of the switch S3-i is connected to one end of the capacitor C3-i, and the other end of the capacitor C3-i is grounded. By controlling the on and off of the switch S3-i, it is realized to control whether the i-th output component 300 provides voltage.

[0080] When the switching power supply circuit operates in the working scene corresponding to the i-th output component 300, the switch S3-i in the i-th output component 300 is closed, and the switches of other output components 300 are disconnected, so that only the i-th output component 300 provides voltage, and other output components 300 do not provide voltage. When the switching power supply circuit is in a steady state in the working scene corresponding to the i-th output component 300, the capacitor C3-i is no longer charged or discharged, and the capacitor C3-i has stored a certain amount of electrical energy, so that there is a voltage difference between the two ends of the capacitor C3-i. Based on this, the voltage provided by the i-th output component 300 is equal to the ground terminal voltage plus the voltage difference between the two ends of the capacitor C3-i. In general, the ground terminal voltage is 0, and the voltage provided by the i-th output component 300 can be regarded as the voltage difference between the two ends of the capacitor C3-i.

[0081] It is understandable that in different working scenarios, the energy storage conditions of the corresponding capacitors are different, resulting in different voltage differences across the capacitors. Therefore, when the output voltage Vout changes, it is equivalent to switching the working scenario. In this case, the output component 300 also switches accordingly, causing the voltage provided by the regulating module 30 to also switch.

[0082] like Figure 4 As shown, the first output component 301 includes a first switch S3-1 and a first capacitor C3-1, one end of the first switch S3-1 is connected to the control module 40, and the other end of the first switch S3-1 is connected to the first capacitor C3-1. The first switch S3-1 is used to be in a closed state before the output voltage Vout changes, and to be in an open state after the output voltage Vout changes. The first capacitor C3-1 is used to provide the second voltage V3-1 to the control module 40 when the first switch S3-1 is in a closed state.

[0083] The second output component 302 includes a second switch S3-2 and a second capacitor C3-2. One end of the second switch S3-2 is connected to the control module 40, and the other end of the second switch S3-2 is connected to the second capacitor C3-2. The second switch S3-2 is configured to be in an open state before the output voltage Vout changes, and to be in a closed state after the output voltage Vout changes. The second capacitor C3-2 is configured to provide a third voltage V3-2 to the control module 40 when the second switch S3-2 is in a closed state.

[0084] In this example, the first output component 301 operates in a scenario before the output voltage Vout changes. Based on this, before the output voltage Vout changes, the first switch S3-1 is in a closed state, so that the first capacitor C3-1 can provide the second voltage V3-1 to the control module 40; after the output voltage Vout changes, the first switch S3-1 is in an open state, so that the first capacitor C3-1 no longer provides the second voltage V3-1 to the control module 40.

[0085] Similarly, the second output component 302 operates in a scenario after the output voltage Vout changes. Based on this, before the output voltage Vout changes, the second switch S3-2 is in an open state, so that the second capacitor C3-2 does not provide the third voltage V3-2 to the control module 40; after the output voltage Vout changes, the second switch S3-2 is in a closed state, so that the second capacitor C3-2 can provide the third voltage V3-2 to the control module 40.

[0086] In practical applications, the switch in each output component 300 can be controlled to be on and off by a corresponding flag signal. That is to say, different output components 300 correspond to different flag signals, and the flag signal is used to control the on and off of the switch in the corresponding output component 300. When the flag signal is at a high level, the switch in the corresponding output component 300 is controlled to be closed; when the flag signal is at a low level, the switch in the corresponding output component 300 is controlled to be disconnected. Alternatively, when the flag signal is at a low level, the switch in the corresponding output component 300 is controlled to be closed; when the flag signal is at a high level, the switch in the corresponding output component 300 is controlled to be disconnected. The embodiment of the present application does not limit the method for generating the flag signal. Two possible implementation methods are shown below, as shown in implementation method A and implementation method B, respectively.

[0087] In implementation method A, the first switch S3-1 is used to connect to the first signal generating module, receive the first flag signal generated by the first signal generating module, and close or open under the control of the first flag signal, wherein before the output voltage Vout changes, the first flag signal indicates that the first switch S3-1 is closed, and after the output voltage Vout changes, the first flag signal indicates that the first switch S3-1 is opened.

[0088] The second switch S3-2 is used to connect to the second signal generating module, receive the second flag signal generated by the second signal generating module, and close or open under the control of the second flag signal, wherein before the output voltage Vout changes, the second flag signal indicates that the second switch S3-2 is opened, and after the output voltage changes, the second flag signal indicates that the second switch S3-2 is closed.

[0089] Wherein, the first signal generating module is used to generate a first flag signal. The first signal generating module is connected to the first switch S3-1 so that the first switch S3-1 can receive the first flag signal. The first flag signal can indicate whether the switching power supply circuit works in the working environment corresponding to the first output component 301. Before the output voltage Vout changes, the first flag signal indicates that the switching power supply circuit works in the working environment corresponding to the first output component 301. In this case, it is equivalent to the first flag signal indicating that the first switch S3-1 is closed. The first switch S3-1 is closed under the control of the first flag signal, so that the first capacitor C3-1 can provide the second voltage V3-1 to the control module 40. After the output voltage Vout changes, the first flag signal indicates that the switching power supply circuit does not work in the working environment corresponding to the first output component 301. In this case, it is equivalent to the first flag signal indicating that the first switch S3-1 is disconnected. The first switch S3-1 is disconnected under the control of the first flag signal, so that the first capacitor C3-1 no longer provides the second voltage V3-1 to the control module 40.

[0090] Similarly, the second signal generating module is used to generate a second flag signal. The second signal generating module is connected to the second switch S3-2 so that the second switch S3-2 can receive the second flag signal. The second flag signal can indicate whether the switching power supply circuit is working in the working environment corresponding to the second output component 302. Before the output voltage Vout changes, the second flag signal indicates that the switching power supply circuit is not working in the working environment corresponding to the second output component 302. In this case, it is equivalent to the second flag signal indicating that the second switch S3-2 is disconnected. The second switch S3-2 is disconnected under the control of the second flag signal, so that the second capacitor C3-1 no longer provides the third voltage V3-2 to the control module 40. After the output voltage Vout changes, the second flag signal indicates that the switching power supply circuit is working in the working environment corresponding to the second output component 302. In this case, it is equivalent to the second flag signal indicating that the second switch S3-2 is closed. The second switch S3-2 is closed under the control of the second flag signal, so that the second capacitor C3-2 can provide the third voltage V3-2 to the control module 40.

[0091] The embodiment of the present application does not limit the structure of the first signal generating module and the second signal generating module. In practical applications, any circuit that can generate the first flag signal can be used as the first signal generating module, and any circuit that can generate the second flag signal can be used as the second signal generating module.

[0092] Optionally, the first flag signal includes a frame start pulse signal or a clock signal; or, the second flag signal includes a frame start pulse signal or a clock signal.

[0093] Generally, display devices such as mobile phones, computers, and televisions include display driver circuits. When a picture frame comes, the picture frame is processed by the display driver circuit so that the picture frame is displayed on the display. In this case, the load jumps from a light load to a heavy load, and the load current transiently increases. When the display driver circuit finishes processing the picture frame, the load jumps from a heavy load to a light load, and the load current transiently decreases.

[0094] The display driving circuit includes a first subcircuit for generating a frame start pulse (Start Pulse, STV) signal and a second subcircuit for generating a clock (Clock, clk) signal. Among them, the STV signal can mark the beginning of a frame of the picture, ensuring that the display driving circuit can accurately work and process the picture frame at the arrival time of the picture frame. Generally, when the display driving circuit starts to process the picture frame, the STV signal jumps from a low level to a high level; during the process of the display driving circuit processing the picture frame, the STV signal remains at a high level; when the display driving circuit completes processing the picture frame, the STV signal jumps from a high level to a low level. Based on this, since the STV signal can reflect the load jumping from a light load to a heavy load, and the load jumping from a heavy load to a light load, the STV signal can be used as a first flag signal or a second flag signal.

[0095] In some cases, the STV signal and the clk signal are synchronized, based on which the clk signal can also reflect the load jump from light load to heavy load, or the load jump from heavy load to light load. In other words, the clk signal can be used as the first flag signal or the second flag signal. It should be noted that only one of the STV signal and the clk signal can be used as the first flag signal, or can be used as the second flag signal.

[0096] like Figure 6 As shown, the STV signal includes an STV0 signal and an STVOUT signal. When the load changes from a light load to a heavy load, the load current will transiently increase. At this time, the STV0 signal, the STVOUT signal, and the clk signal all change from a low level to a high level. When the load changes from a heavy load to a light load, the load current will transiently decrease. At this time, the STV0 signal, the STVOUT signal, and the clk signal all change from a high level to a low level. Based on this, any one of the STV0 signal, the STVOUT signal, and the clk signal can be used as a first flag signal, or as a second flag signal, or as a flag signal of a switch in other output components 300 except the first output component 301 and the second output component 302.

[0097] Since the frame start pulse signal and the clock signal can accurately reflect the change of the load current, using the frame start pulse signal or the clock signal as a flag signal can enable the adjustment module 30 to switch the switch at the moment the load current changes to switch the provided voltage, which is beneficial to improving the transient response of the switching power supply circuit.

[0098] In implementation B, if Figure 7 As shown, the switching power supply circuit also includes a detection module 50. The detection module 50 is connected to the conversion module 10, and is used to detect the change of the output voltage Vout, and generate a first flag signal and a second flag signal according to the change. The detection module 50 is connected to the first switch S3-1 and the second switch S3-2, respectively, and is also used to transmit the first flag signal to the first switch S3-1 and the second flag signal to the second switch S3-2.

[0099] Before the output voltage Vout changes, the first flag signal indicates that the first switch S3-1 is closed, and the second flag signal indicates that the second switch S3-2 is opened; after the output voltage Vout changes, the first flag signal indicates that the first switch S3-1 is opened, and the second flag signal indicates that the second switch S3-2 is closed.

[0100] In this example, the detection module 50 includes a differentiator 501, which is connected to the conversion module 10. The differentiator 501 is used to receive the output voltage Vout provided by the conversion module 10, and determine the change slope of the output voltage Vout according to the output voltage Vout. The change slope of the output voltage Vout can reflect the change amplitude of the load current. Generally, the greater the amplitude of the transient increase or transient decrease of the load current, the greater the change slope of the output voltage Vout; the smaller the amplitude of the transient increase or transient decrease of the load current, the smaller the change slope of the output voltage Vout.

[0101] The detection module 50 also includes an ADC (Analog-to-Digital Converter) 502. The ADC 502 is connected to the differentiator 501 and is used to receive the change slope output by the differentiator 501. The change slope of the output voltage Vout is an analog signal, and the ADC 502 can convert the analog signal into a digital signal. The principle is: multiple slope intervals are pre-set. For each slope interval, if the change slope of the output voltage Vout belongs to this slope interval, the ADC 502 determines that the digital signal corresponding to the slope interval is a high level (or a low level); if the change slope of the output voltage Vout does not belong to this slope interval, the ADC 502 determines that the digital signal corresponding to the slope interval is a low level (or a high level).

[0102] In this example, the change slope of the output voltage Vout is always in a certain slope interval, so that the ADC502 can determine that the digital signal corresponding to this slope interval is a high level based on the change slope of the output voltage Vout, and the digital signals corresponding to other slope intervals are low levels. Alternatively, the ADC502 can determine that the digital signal corresponding to this slope interval is a low level based on the change slope of the output voltage Vout, and the digital signals corresponding to other slope intervals are high levels.

[0103] ADC502 is connected to the switches in each output component 300. Figure 5 and Figure 7 As shown, the i-th output component 300 includes a switch S3-i, and the ADC 502 is connected to the switch S3-i. The ADC 502 can output multiple digital signals, and the multiple digital signals correspond to the multiple output components 300 one by one. The ADC 502 can transmit the corresponding digital signal to the switch in each output component 300 to control the on and off of the switch through the digital signal, and the digital signal is the flag signal mentioned above.

[0104] The multiple output components 300 include a first output component 301 and a second output component 302. Based on this, the differentiator 501 determines the change slope according to the output voltage Vout, and the ADC502 determines the first flag signal and the second flag signal according to the change slope. The ADC502 is connected to the first switch S3-1, and is used to transmit the first flag signal to the first switch S3-1, so as to control the on-off of the first switch S3-1 through the first flag signal. The ADC502 is also connected to the second switch S3-2, and is used to transmit the second flag signal to the second switch S3-2, so as to control the on-off of the second switch S3-2 through the second flag signal. Among them, the content of controlling the on-off of the switch by the flag signal has been described above, and will not be repeated here.

[0105] The switching power supply circuit also includes a control module 40. The control module 40 is connected to the feedback module 20 and is used to receive the first voltage VC. The control module 40 is also connected to the regulation module 30 and is used to receive the second voltage V3-1 before the output voltage Vout changes, and regulate the output voltage Vout according to the first voltage VC and the second voltage V3-1; after the output voltage Vout changes, receive the third voltage V3-2, and regulate the output voltage Vout according to the first voltage VC and the third voltage V3-2.

[0106] In one possible implementation, Figure 4As shown, the control module 40 includes a sampling component 401 and a regulating component 402; the sampling component 401 is connected to the regulating component 402 and the conversion module 10, and is used to sample the first current of the switch tube S1 in the conversion module 10 and output a fourth voltage to the regulating component 402; the regulating component 402 is used to stabilize the output voltage according to the first voltage, the third voltage and the fourth voltage.

[0107] In the embodiment of the present application, the sampling component 401 is connected to the emitter of the switch tube S1 to collect the first current of the switch tube S1. The sampling component 401 is also connected to the regulating component 402 to convert the first current into a fourth voltage V- and output the fourth voltage V- to the regulating component 402.

[0108] Optionally, the resistor Rsense is an adjustable resistor, which is a resistor whose resistance value can be adjusted. In this example, the sampling component 401 includes a resistor Rsense and a current sensor, wherein the resistor Rsense is connected in series between the switch tube and the ground terminal, wherein the resistor Rsense is used to adjust the resistance value based on the change in the output voltage Vout; one end of the current sensor is connected to the series node between the resistor Rsense and the switch tube S1, and the other end of the current sensor is connected to the regulating component 402, which is used to sample the first current of the series node and output a fourth voltage to the regulating component 402 according to the first current.

[0109] The sampling component 401 includes a resistor Rsense and a current sensor, and optionally, the current sensor is a Hall current sensor ACS. One end of the resistor Rsense is grounded, the other end of the resistor Rsense is connected to the emitter of the switch tube S1, and the connection node of the resistor Rsense and the emitter of the switch tube S1 is connected to the current sensor. Since the resistor Rsense is an adjustable resistor, the resistor Rsense can adjust the resistance value based on the change in the output voltage Vout, thereby adjusting the first current. In this example, if the output voltage Vout increases, the resistance value of the resistor Rsense decreases, so that the current (i.e., the first current) of the resistor Rsense increases; if the output voltage Vout decreases, the resistance value of the resistor Rsense increases, so that the current (i.e., the first current) of the resistor Rsense decreases.

[0110] The current sensor is used to sample the first current. The first current can be converted into a sampling voltage, which can be a fourth voltage V-, or a sawtooth signal can be applied to the sampling voltage to obtain a fourth voltage V-, so that the fourth voltage V- is more stable. Optionally, the current sensor samples the first current when the switch tube S1 is turned on, and does not sample the first current when the switch tube S1 is turned off. Based on this, the first current and the fourth voltage V- corresponding to the first current are both sawtooth signals. The fourth voltage V- is positively correlated with the first current, that is, when the first current increases, the fourth voltage V- also increases, and when the first current decreases, the fourth voltage V- also decreases.

[0111] The regulating component 402 includes a comparator CMP. The positive terminal of the comparator CMP is connected to the feedback module 20 and the regulating module 30, and is used to receive the first voltage VC and the second voltage V3-1 before the output voltage Vout changes, and the first voltage VC and the second voltage V3-1 are superimposed to obtain the positive input voltage V+ of the CMP; after the output voltage Vout changes, the first voltage VC and the third voltage V3-2 are received, and the first voltage VC and the third voltage V3-2 are superimposed to obtain the positive input voltage V+ of the CMP. The negative terminal of the comparator CMP is connected to the sampling component 401, and is used to receive the fourth voltage V-, which is also the negative input voltage V- of the comparator CMP.

[0112] The comparator CMP is used to compare the positive input voltage V+ and the negative input voltage V-. Whenever the negative input voltage V- is equal to the positive input voltage V+, the voltage output by the comparator CMP flips, that is, flips the high level to the low level, or flips the low level to the high level. By continuously flipping the output voltage of the comparator CMP, a pulse signal is obtained.

[0113] The regulating component 402 also includes a controller, which is connected to the output end of the comparator CMP and the base of the switch tube S1. The controller can receive a pulse signal and control the on and off of the switch tube S1 according to the pulse signal. For example, when the pulse signal is at a high level, the controller controls the switch tube S1 to be turned on; when the pulse signal is at a low level, the controller controls the switch tube S1 to be turned off. Alternatively, when the pulse signal is at a low level, the controller controls the switch tube S1 to be turned on; when the pulse signal is at a high level, the controller controls the switch tube S1 to be turned off.

[0114] When the load current of the load Rload increases transiently or the input voltage Vin decreases, the output voltage Vout decreases, causing the first voltage VC to increase. In this example, on the one hand, the regulating module 30 switches the second voltage V3-1 to a larger third voltage V3-2, so that the positive input voltage V+ of the comparator CMP increases transiently, thereby reducing the flip speed of the output voltage of the comparator CMP and increasing the energy storage time of the inductor L. On the other hand, the resistance value of the resistor Rsense increases, so that the first current decreases, thereby reducing the negative input voltage V- of the comparator CMP, thereby reducing the flip speed of the output voltage of the comparator CMP and increasing the energy storage time of the inductor L. In other words. In the case of a decrease in the output voltage Vout, the positive input voltage V+ of the comparator CMP can be increased, and the negative input voltage V- of the comparator CMP can be reduced to extend the energy storage time of the inductor L, increase the inductor current, and thus quickly restore the output voltage Vout and improve the transient response of the switching power supply circuit.

[0115] When the load current of the load Rload decreases transiently or the input voltage Vin increases, the output voltage Vout increases, resulting in a decrease in the first voltage VC. In this example, on the one hand, the regulating module 30 switches the second voltage V3-1 to a smaller third voltage V3-2, so that the positive input voltage V+ of the comparator CMP decreases transiently, thereby accelerating the flip speed of the output voltage of the comparator CMP and reducing the energy storage time of the inductor L. On the other hand, the resistance value of the resistor Rsense decreases, so that the first current increases, thereby increasing the negative input voltage V- of the comparator CMP, and then accelerating the flip speed of the output voltage of the comparator CMP and reducing the energy storage time of the inductor L. In other words. In the case of a rise in the output voltage Vout, the positive input voltage V+ of the comparator CMP can be reduced, and the negative input voltage V- of the comparator CMP can be increased to accelerate the flip speed of the output voltage of the comparator CMP, reduce the energy storage time of the inductor L, and reduce the inductor current, thereby quickly recovering the output voltage Vout and improving the transient response of the switching power supply circuit.

[0116] In practical applications, when the output voltage Vout decreases, based on the implementation principle provided in the embodiment of the present application, only the positive input voltage V+ of the comparator CMP can be increased, or based on the implementation principle provided in the embodiment of the present application, only the negative input voltage V- of the comparator CMP can be reduced, or based on the above content, the positive input voltage V+ of the comparator CMP can be increased and the negative input voltage V- of the comparator CMP can be reduced. The above three methods can improve the transient response of the switching power supply circuit.

[0117] Similarly, when the output voltage Vout increases, based on the implementation principle provided in the embodiment of the present application, only the positive input voltage V+ of the comparator CMP can be reduced, or based on the implementation principle provided in the embodiment of the present application, only the negative input voltage V- of the comparator CMP can be increased, or based on the above content, the positive input voltage V+ of the comparator CMP can be reduced and the negative input voltage V- of the comparator CMP can be increased. The above three methods can improve the transient response of the switching power supply circuit.

[0118] Combine the following Figure 4 To fully explain the implementation principle of the embodiment of the present application. In this example, when the load current of the load Rload increases transiently, since the switching power supply circuit has no time to respond, the capacitor Cout discharges, causing the output voltage Vout to drop. After the output voltage Vout is sampled by the sampling resistor R1 and the sampling resistor R2, the feedback voltage VFB is obtained. Since the output voltage Vout drops, the feedback voltage VFB drops, while the reference voltage VREF remains unchanged, so the first voltage VC increases. In addition, the adjustment module 30 switches the first output component 301 to the second output component 302, the first output component 301 is used to provide the second voltage V3-1, and the second output component 302 is used to provide the third voltage V3-2, and the third voltage V3-2 is greater than the second voltage V3-1. In other words, the adjustment module 30 can provide a larger third voltage V3-2, so that the positive input voltage V+ of the comparator CMP determined based on the third voltage V3-2 and the first voltage VC increases transiently. Based on this, the switching speed of the output voltage of the comparator CMP can be reduced, so that the inductor L can accumulate more electric energy to increase the inductor current, so that the capacitor Cout is charged, thereby gradually recovering the output voltage Vout.

[0119] like Figure 8 As shown, when the load current increases, the output voltage Vout decreases. In this example, the positive input voltage V+ can be transiently increased by the adjustment module 30. In this case, the inductor L needs to accumulate more electrical energy to increase the inductor current, thereby increasing the negative input voltage V-. When the negative input voltage V- is equal to the positive input voltage V+, the output voltage of the comparator CMP flips, and the state of the switch tube S1 changes. By increasing the energy storage time of the inductor L, the inductor current can be increased, so that the output voltage Vout can return to stability faster.

[0120] When the load current increases, the output voltage Vout decreases. In this example, the regulating module 30 can increase the positive input voltage V+ transiently under the control of any one of the STV0 signal, the STVOUT signal, and the clk signal, so that the output voltage Vout returns to stability. Figure 6The recovery curves of the output voltage Vout of the switching power supply circuit in the embodiment of the present application under the control of the STV0 signal, the STVOUT signal, and the clk signal, and the recovery curve of the output voltage Vout of the switching power supply circuit in the related art are shown. By comparing the above recovery curves, it can be seen that compared with the switching power supply circuit in the related art, the switching power supply circuit in the embodiment of the present application can recover the output voltage Vout faster and reduce the drop of the output voltage Vout.

[0121] On the contrary, when the load current of the load Rload decreases transiently, since the switching power supply circuit does not have time to respond, the capacitor Cout is charged, causing the output voltage Vout to rise. After the output voltage Vout is sampled by the sampling resistor R1 and the sampling resistor R2, the feedback voltage VFB is obtained. Since the output voltage Vout rises, the feedback voltage VFB rises, while the reference voltage VREF remains unchanged, so the first voltage VC decreases. In addition, the regulating module 30 switches the first output component 301 to the second output component 302, the first output component 301 is used to provide the second voltage V3-1, and the second output component 302 is used to provide the third voltage V3-2, and the third voltage V3-2 is less than the second voltage V3-1. In other words, the regulating module 30 can provide a smaller third voltage V3-2, so that the positive input voltage V+ of the comparator CMP determined based on the third voltage V3-2 and the first voltage VC is transiently reduced. Based on this, the switching speed of the output voltage of the comparator CMP can be increased, and the energy storage time of the inductor L can be reduced to reduce the inductor current, so that the capacitor Cout is discharged, thereby gradually recovering the output voltage Vout.

[0122] Figure 6 The recovery curves of the output voltage Vout of the switching power supply circuit in the embodiment of the present application under the control of the STV0 signal, the STVOUT signal, and the clk signal, and the recovery curve of the output voltage Vout of the switching power supply circuit in the related art are shown. By comparing the above recovery curves, it can be seen that compared with the switching power supply circuit in the related art, the switching power supply circuit in the embodiment of the present application can recover the output voltage Vout faster and reduce the rise of the output voltage Vout.

[0123] In the above circuit, the regulating module can switch the voltage provided to the control module when the output voltage changes, so that the control module can quickly stabilize the output voltage according to the switched voltage, i.e., the third voltage. By accelerating the stabilization speed of the output voltage, the recovery time of the output voltage is reduced, the transient response of the switching power supply circuit is improved, and thus the performance of the switching power supply circuit is improved.

[0124] In an exemplary embodiment, if Fig. 9As shown, an embodiment of the present application further provides a chip, and the chip includes the switching power supply circuit mentioned in the above embodiment.

[0125] In an exemplary embodiment, if Fig.10 As shown, an embodiment of the present application further provides an electronic device, and the electronic device includes the chip mentioned in the above embodiment.

[0126] It should be understood that the "plurality" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0127] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0128] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A switching power supply circuit, characterized in that: The circuit includes a conversion module, a feedback module, a regulation module and a control module; The conversion module is used to convert the input voltage into the output voltage; The feedback module is connected to the conversion module and the control module, and is used to output a first voltage to the control module according to the output voltage; The regulating module is connected to the control module and is used to switch the second voltage provided to the control module to a third voltage based on the change of the output voltage, wherein the second voltage is different from the third voltage; The control module is connected to the conversion module, and is used to stabilize the output voltage according to the first voltage and the third voltage.

2. The circuit according to claim 1, characterized in that The regulating module comprises a first output component and a second output component, wherein the first output component and the second output component are both connected to the control module; The first output component is used to provide the second voltage to the control module before the output voltage changes; The second output component is used to provide the third voltage to the control module after the output voltage changes.

3. The circuit according to claim 2, characterized in that The first output component includes a first switch and a first capacitor, one end of the first switch is connected to the control module, and the other end of the first switch is connected to the first capacitor; The first switch is configured to be in a closed state before the output voltage changes, and to be in an open state after the output voltage changes; The first capacitor is used to provide the second voltage to the control module when the first switch is in a closed state; The second output component includes a second switch and a second capacitor, one end of the second switch is connected to the control module, and the other end of the second switch is connected to the second capacitor; The second switch is configured to be in an open state before the output voltage changes, and to be in a closed state after the output voltage changes; The second capacitor is used to provide the third voltage to the control module when the second switch is in a closed state.

4. The circuit according to claim 3, characterized in that The first switch is used to connect to the first signal generating module, receive the first flag signal generated by the first signal generating module, and be closed or opened under the control of the first flag signal, wherein before the output voltage changes, the first flag signal indicates that the first switch is closed, and after the output voltage changes, the first flag signal indicates that the first switch is opened; The second switch is used to connect to the second signal generating module, receive the second flag signal generated by the second signal generating module, and close or open under the control of the second flag signal, wherein before the output voltage changes, the second flag signal indicates that the second switch is opened, and after the output voltage changes, the second flag signal indicates that the second switch is closed.

5. The circuit according to claim 4, characterized in that The first flag signal includes a frame start pulse signal or a clock signal; Alternatively, the second flag signal includes the frame start pulse signal or the clock signal.

6. The circuit according to claim 3, characterized in that The circuit also includes a detection module; The detection module is connected to the conversion module and is used to detect the change of the output voltage and generate a first flag signal and a second flag signal according to the change; The detection module is connected to the first switch and the second switch respectively, and is further used to transmit the first flag signal to the first switch and transmit the second flag signal to the second switch; Before the output voltage changes, the first flag signal indicates that the first switch is closed, and the second flag signal indicates that the second switch is opened; after the output voltage changes, the first flag signal indicates that the first switch is opened, and the second flag signal indicates that the second switch is closed.

7. The circuit according to any one of claims 1 to 6, characterized in that: The control module includes a sampling component and a regulating component; The sampling component is connected to the regulating component and the conversion module, and is used to sample the first current of the switch tube in the conversion module and output a fourth voltage to the regulating component; The regulating component is used to stabilize the output voltage according to the first voltage, the third voltage and the fourth voltage.

8. The circuit according to claim 7, characterized in that The sampling component includes a resistor and a current sensor, wherein the resistor is connected in series between the switch tube and the ground terminal, wherein the resistor is used to adjust the resistance value based on the change of the output voltage; One end of the current sensor is connected to the series node between the resistor and the switch tube, and the other end of the current sensor is connected to the regulating component, for sampling the first current of the series node and outputting the fourth voltage to the regulating component according to the first current.

9. A chip, characterized in that: The chip includes the switching power supply circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device comprises the chip according to claim 9.

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