A switching power supply circuit, control method and power supply device

Abstract

The present application relates to the technical field of switching power supplies, and proposes a switching power supply circuit, a control method, and a power supply device; the switching power supply circuit includes a power output module, a first detection module, and a second detection module; when the switching power supply circuit is in a low power consumption mode, the first detection module is used to detect the output voltage of the voltage output terminal, so that when the output voltage is detected to be less than a first preset voltage, the first detection module sends a charging signal to the power output module, and sends a detection signal to the second detection module, and the charging signal is used to instruct the power output module to charge the voltage output terminal; when the detection signal is received, the second detection module is used to detect the output voltage of the voltage output terminal, so that when the output voltage is detected to be less than the second preset voltage, the switching power supply circuit exits the low power consumption mode. The present application can solve the problem of a large drop in the low power consumption mode exit of the switching power supply circuit, thereby improving the stability and reliability of the switching power supply circuit.

Description

Technical Field

[0001] The present application relates to the technical field of switching power supplies, and in particular to a switching power supply circuit, a control method and a power supply device. Background Art

[0002] With the rapid rise of smart wearables, the standby power consumption of DCDC switching power supplies is required to be lower and lower. In the prior art, the common practice of low-power DCDC switching power supplies is: when the load is detected to be extremely low, most of the power-consuming modules are turned off, and even the clock module and the main control loop module are turned off to significantly reduce the standby power consumption. When the load rises, these modules are turned back on, but since it takes a certain amount of time to turn on these modules, when the load changes drastically in a very short time, the output end is bound to drop sharply, which will cause the switching power supply circuit to be unstable, especially for some high-end smart wearable devices, the experience of using them in actual scenarios is poor. Summary of the invention

[0003] The purpose of the present application is to provide a switching power supply circuit, a control method and a power supply device to solve the problem that the output voltage may drop significantly due to the exit of the low power consumption mode of the existing switching power supply circuit due to a sudden load change, thereby improving the stability and reliability of the switching power supply circuit.

[0004] A first aspect of the present application provides a switching power supply circuit, the switching power supply circuit comprising a power output module, a first detection module and a second detection module;

[0005] The power output module is connected to the first detection module, and is also respectively connected to the voltage output terminal of the switching power supply circuit, and the first detection module is connected to the second detection module;

[0006] When the switching power supply circuit is in a low power consumption mode, the first detection module is used to detect the output voltage of the voltage output terminal, so that when it is detected that the output voltage is less than a first preset voltage, the first detection module sends a charging signal to the power output module and sends a detection signal to the second detection module, and the charging signal is used to instruct the power output module to charge the voltage output terminal;

[0007] When receiving the detection signal, the second detection module is used to detect the output voltage of the voltage output terminal, so that when it is detected that the output voltage is less than a second preset voltage, the switching power supply circuit exits the low power consumption mode;

[0008] Wherein, the second preset voltage is smaller than the first preset voltage.

[0009] Further, the first detection module includes a first comparator, the first comparator is provided with a first input terminal, a second input terminal and a first signal output terminal; the first signal output terminal is connected to the power output module; the voltage output terminal is connected to the first input terminal, and the second input terminal is used to receive the first preset voltage, wherein:

[0010] When the switching power supply circuit is in the low power consumption mode, the first comparator is used to compare the output voltage of the voltage output terminal with the first preset voltage, so that when it is detected that the output voltage is less than the first preset voltage, the first signal output terminal outputs a first preset amplitude charging signal and the detection signal, and the first preset amplitude charging signal is used to instruct the power output module to charge the voltage output terminal with a first preset amplitude.

[0011] Further, the second detection module includes a second comparator, the second comparator is provided with a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal and a second signal output terminal, the second signal output terminal is connected to the power output module; the voltage output terminal is connected to the fourth input terminal, the first signal output terminal is also connected to the fifth input terminal, the sixth input terminal is used to receive the second preset voltage, and the seventh input terminal is used to receive the second reference voltage, wherein:

[0012] When receiving the detection signal, the second comparator is used to compare the output voltage with the second preset voltage, so that when it is detected that the output voltage is less than the second preset voltage, the second signal output terminal outputs a first voltage switching signal;

[0013] Under the action of the first voltage switching signal, the second comparator is used to compare the output voltage with the second reference voltage, so that when the output voltage is less than the second reference voltage, the second signal output terminal outputs a low-power exit signal and a second preset amplitude charging signal, the low-power exit signal is used to instruct the switching power supply circuit to exit the low-power mode, and the second preset amplitude charging signal is used to instruct the power output module to charge the voltage output terminal with a second preset amplitude; and when the output voltage is not less than the second reference voltage, the second signal output terminal outputs a second preset amplitude stop charging signal, and the second preset amplitude stop charging signal is used to instruct the power output module to stop charging the voltage output terminal with a second preset amplitude.

[0014] Further, the first detection module also includes a current detection module and an overcurrent protection module; the first comparator is also provided with a third input terminal, and the third input terminal is used to receive a first reference voltage; the overcurrent protection module is provided with an eighth input terminal, a ninth input terminal, a tenth input terminal and a third signal output terminal, and the third signal output terminal is connected to the power output module; the first signal output terminal is also respectively connected to the input terminal of the current detection module and to the ninth input terminal, the output terminal of the current detection module is connected to the eighth input terminal, and the tenth input terminal is used to receive an overcurrent protection preset current, wherein:

[0015] When it is detected that the output voltage is less than the first preset voltage, the first signal output terminal is further used to output an enable signal indicating that the current detection module and the overcurrent protection module are enabled, so that when the output signal value of the current detection module is greater than the overcurrent protection preset current value, the current detection module instructs the third signal output terminal of the overcurrent protection module to output a first preset amplitude stop charging signal, and the first preset amplitude stop charging signal is used to instruct the power output module to stop charging the voltage output terminal with a first preset amplitude;

[0016] After the first signal output terminal outputs the first preset amplitude charging signal, the first signal output terminal is further used to output a second voltage switching signal;

[0017] Under the action of the second voltage switching signal, the first comparator is used to compare the output voltage with the first reference voltage, so that when the output voltage is greater than the first reference voltage, the first signal output terminal outputs a disabling signal indicating that the current detection module and the overcurrent protection module are disabled;

[0018] Wherein, the first reference voltage is greater than the first preset voltage.

[0019] Further, the power output module includes a power unit, and an energy storage inductor and / or energy storage capacitor connected to the power unit, wherein:

[0020] The power unit is used to input charging energy to the energy storage unit and / or the energy storage capacitor.

[0021] Furthermore, the switching power supply circuit also includes an energy storage module, wherein:

[0022] The power output module is connected to the energy storage module, and the energy storage module is connected to the voltage output terminal;

[0023] The charging signal is used to instruct the power output module to charge the energy storage module, and the energy storage module to charge the voltage output terminal.

[0024] Furthermore, the switching power supply circuit also includes a control module and a load power consumption detection module;

[0025] The control module is connected to the load power consumption detection module and the power output module respectively;

[0026] When the control module is in an enabled state, the power consumption detection module is used to detect the load according to the load information, so that when the load is detected to be less than a preset value, the switching power supply circuit enters a low power consumption mode and the control module enters a disabled state.

[0027] A second aspect of the present application provides a control method for a switching power supply circuit, the switching power supply circuit comprising the switching power supply circuit of any one of the first aspects above, wherein the control method comprises:

[0028] When the switching power supply circuit is in a low power consumption mode, the first detection module detects whether the output voltage of the voltage output terminal is less than a first preset voltage;

[0029] When it is detected that the output voltage is less than the first preset voltage, the first detection module sends a first preset amplitude charging signal to the power output module, and the first preset amplitude instructs the power output module to charge the voltage output end with a first preset amplitude;

[0030] When the voltage output terminal is in the state of being charged and boosted, the second detection module detects whether the output voltage of the voltage output terminal is less than a second preset voltage;

[0031] When it is detected that the output voltage is less than the second preset voltage, the switching power supply circuit exits the low power consumption mode;

[0032] Wherein, the second preset voltage is smaller than the first preset voltage.

[0033] Furthermore, after detecting that the output voltage is less than the second preset voltage, the control method further includes:

[0034] The second detection module sends a second preset amplitude charging signal to the power output module;

[0035] The second preset amplitude instructs the power output module to charge the voltage output end with a second preset amplitude.

[0036] A third aspect of the present application provides a power supply device, wherein the power supply device includes the switching power supply circuit described in any one of the first aspects above.

[0037] The present application proposes a switching power supply circuit, a control method and a power supply device; wherein, the switching power supply circuit is provided with two voltage detection modules, and specifically detects the output voltage of the voltage output terminal through the first detection module, so that when it is detected that the output voltage is less than the first preset voltage, it does not directly exit the low power consumption mode, but charges the voltage output terminal through the power output module, and when the voltage output terminal is in the state of being charged and boosted, further detects the output voltage of the voltage output terminal through the second detection module, so that when it is detected that the output voltage is less than the second preset voltage, the switching power supply circuit at this time exits the low power consumption mode, so that when the switching power supply circuit is in the low power consumption mode, if, for example, the load suddenly changes in a very short time (such as jumping from no-load to full load), the voltage output terminal at this time will not drop significantly, thereby improving the stability and reliability of the power switch circuit, and further improving the use experience of the actual product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art 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 paying creative labor.

[0039] Figure 1 This is a schematic diagram of a switch power supply circuit of the prior art provided by the present application;

[0040] Figure 2 This is a circuit structure diagram of a switching power supply circuit provided in Example 1 of the present application;

[0041] Figure 3 is another circuit structure schematic diagram of a switching power supply circuit provided in Example 1 of the present application;

[0042] Figure 4 is a circuit structure diagram of a first comparator provided in Example 1 of the present application;

[0043] Figure 5 is a circuit structure diagram of a second comparator provided in Example 1 of the present application;

[0044] Figure 6 It is a flow chart of a control method of a switching power supply circuit provided in Example 2 of the present application.

[0045] The markings of the drawings in the specification are as follows:

[0046] PO1-power output module;

[0047] VD1-first detection module; CMP1-first comparator;

[0048] VD2-second detection module; CMP2-second comparator;

[0049] VOUT-voltage output terminal;

[0050] Current sense-current detection module;

[0051] OCP-overcurrent protection module;

[0052] CT1 - control module;

[0053] LD1-power consumption detection module;

[0054] ES1 - Energy storage unit. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0057] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0058] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0059] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present application. When used herein, the singular forms of "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the existence of the features, integers, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items. In order to thoroughly understand the present application, detailed structures and steps will be proposed in the following description to illustrate the technical solutions proposed in the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application can also have other implementation methods.

[0060] In order to illustrate the technical solution of the present application, a specific embodiment is provided below for illustration.

[0061] Example 1

[0062] In an application scenario, such as Figure 1 As shown, the existing switching power supply circuit mainly includes a power consumption detection module LD1, a control module CT1 and a voltage detection module VD, wherein when the control module CT1 is enabled (Enable), the power consumption detection module LD1 detects the load according to the load information, so that when it is detected that the load is less than a certain set value, the switching power supply circuit enters a low power consumption mode, and disables the control module CT1 (disable), so as to significantly reduce the standby power consumption of the switching power supply circuit. Specifically, when the control module CT1 is disabled, the power consumption detection module LD1 detects the output voltage according to the voltage information of the voltage output terminal VOUT, and when it is detected that the output voltage is less than a certain set value, the low power consumption mode is exited, and then the control module CT1 is enabled again, and the output voltage is restored to the target value through loop control.

[0063] During this process, when the control module CT1 is disabled, the load may experience a large sudden change in a very short time. For example, when the load jumps from no-load to full load in a very short time, the output voltage of the voltage output terminal VOUT may drop significantly. The main reason for the large drop in output voltage during this process is that it takes a certain amount of time to re-enable the control module CT1. During the loop establishment process, the output voltage of the voltage output terminal VOUT has dropped very seriously, which may affect the stability of the switching power supply circuit. For electronic products in actual application, this may affect the actual user experience. In order to solve the above problems, the inventive concept of this application is proposed, which will be specifically explained through the following embodiments.

[0064] In one embodiment, Figure 2 and Figure 3 As shown, the switching power supply circuit of the present application may specifically include a power output module PO1, a first detection module VD1 and a second detection module VD2, wherein: the power output module PO1 is connected to the first detection module VD1, and the power output module PO1 and the first detection module VD1 are also respectively connected to the voltage output terminal VOUT of the switching power supply circuit, that is, the power output module PO1 is connected to the voltage output terminal VOUT of the switching power supply circuit, the first detection module VD1 is connected to the voltage output terminal VOUT of the switching power supply circuit, and the first detection module VD1 is connected to the second detection module VD2.

[0065] In an application scenario, when the switching power supply circuit is in a low power consumption mode, most of the working modules of the switching power supply circuit are in a disabled state to reduce the power consumption of each working module; specifically, the first detection module VD1 is used to detect the output voltage of the voltage output terminal VOUT, so that when the output voltage is detected to be less than a first preset voltage, the first preset voltage can be, for example, 1.48V, that is, when the output voltage is detected to be less than 1.48V, the first detection module VD1 sends a charging signal to the power output module PO1, and sends a detection signal to the second detection module VD2, wherein the charging signal is used to instruct the power output module PO1 to charge the voltage output terminal VOUT so that the voltage output terminal VOUT is in a charged boost state, and the detection signal is used to instruct the second detection module VD2 to detect the output voltage of the voltage output terminal VOUT.

[0066] Based on the power output module PO1, the voltage output terminal VOUT is charged. When a detection signal is received, the second detection module VD2 is used to detect the output voltage of the voltage output terminal VOUT according to the detection signal, so that when the output voltage is detected to be less than a second preset voltage, the second preset voltage can be, for example, 1.46V, that is, when the power output module PO1 charges the voltage output terminal VOUT, when the output voltage is detected by the second detection module VD2 to be still less than 1.46V, the switching power supply circuit exits the low power consumption mode.

[0067] It should be noted that when the second detection module VD2 detects that the output voltage is greater than or equal to 1.46V, the switching power supply circuit can be maintained in a low power consumption mode. In addition, the second preset voltage is less than the first preset voltage, for example, the first preset voltage is 1.48V, and the second preset voltage is 1.46V. The values ​​of the above embodiments are only used as examples, and other values ​​can be used in actual application scenarios. They can be set according to the actual circuit without specific limitation.

[0068] The switching power supply circuit in the above embodiment is provided with two voltage detection modules. When the switching power supply circuit is in the low power consumption mode, the output voltage of the voltage output terminal VOUT is specifically detected by the first detection module VD1 first, so that when it is detected that the output voltage of the voltage output terminal VOUT is less than the first preset voltage, the low power consumption mode is not directly exited, but the voltage output terminal VOUT is charged by the power output module PO1, and when the voltage output terminal VOUT is in the charged boost state, the output voltage of the voltage output terminal VOUT is detected by the second detection module VD2, so that when the output voltage is detected to be less than the second preset voltage, the switching power supply circuit exits the low power consumption mode. In this way, when the switching power supply circuit is in the low power consumption mode in the initial state, if, for example, the load suddenly changes in a very short time (such as jumping from no-load to full-load), the voltage output terminal VOUT will not drop significantly, thereby improving the stability and reliability of the power switch circuit and further improving the use experience of the actual product.

[0069] In one embodiment, Figure 4 As shown, the first detection module VD1 includes a first comparator CMP1, wherein the first comparator CMP1 is provided with a first input terminal in1, a second input terminal in2 and a first signal output terminal out1; the first signal output terminal out1 is connected to the power output module PO1; the voltage output terminal VOUT is connected to the first input terminal in1, and the second input terminal in2 is used to receive a first preset voltage, so as to compare the output voltage of the voltage output terminal VOUT with the first preset voltage, and output a corresponding signal according to the specific comparison situation.

[0070] Specifically, when the switching power supply circuit is in a low power consumption mode, the first comparator CMP1 is in an enabled state. At this time, the first comparator CMP1 is used to compare the output voltage of the voltage output terminal VOUT with the first preset voltage received by the second input terminal in2, so that when the output voltage is detected to be less than the first preset voltage, for example, when the output voltage is detected to be less than 1.48V, the first signal output terminal out1 outputs a first preset amplitude charging signal and a detection signal, and the first preset amplitude charging signal and the detection signal can be, for example, a high level signal, wherein the first preset amplitude charging signal is used to instruct the power output module PO1 to charge the voltage output terminal VOUT with a first preset amplitude, so that the voltage output terminal VOUT is increased by a certain amplitude through the first power output module PO1. Exemplarily, the first preset amplitude voltage can be, for example, a small amplitude voltage, and the small amplitude voltage can be, for example, a voltage of 0.2V or 0.25V. The specific voltage value can be set according to the actual circuit and can be achieved by charging time or charging power control. The detection signal is used to instruct the second detection module VD2 to detect the output voltage of the voltage output terminal VOUT.

[0071] The first comparator CMP1 in the above embodiment can compare the output voltage with the received preset voltage according to the actual situation by setting the corresponding input terminal and output terminal, so as to output the corresponding signal to drive other connected modules. In addition, by outputting the first preset amplitude charging signal through the first signal output terminal out1, the power output module PO1 can first charge the voltage output terminal VOUT with a small amplitude, and then detect the voltage output terminal VOUT through the second detection module VD2, so as to avoid the influence of the detection of a single detection module, so as to further improve the stability and reliability of the switching power supply circuit.

[0072] In one embodiment, Figure 5 As shown, the second detection module VD2 includes a second comparator CMP2. Specifically, the second comparator CMP2 is provided with a fourth input terminal in4, a fifth input terminal in5, a sixth input terminal in6, a seventh input terminal in7 and a second signal output terminal out2; the voltage output terminal VOUT is also connected to the fourth input terminal in4, the first signal output terminal out1 is also connected to the fifth input terminal in5, the sixth input terminal in6 is used to receive a second preset voltage, and the seventh input terminal in7 is used to receive a second reference voltage.

[0073] Based on the detection signal sent by the first detection module VD1 to the second detection module VD2 in the above embodiment, when the detection signal is received, the second comparator CMP2 is in an enabled state, and the second comparator CMP2 is used to compare the output voltage with the second preset voltage received by the sixth input terminal in6, so that when the output voltage is detected to be less than the second preset voltage, for example, when the output voltage is detected to be less than 1.46V, the second signal output terminal out2 outputs a first voltage switching signal, so that the second comparator is used to compare the output voltage with the second reference voltage, and when the output voltage is detected to be less than the second reference voltage, the second comparator CMP2 instructs the switching power supply circuit to exit the low power consumption mode.

[0074] Specifically, under the action of the above-mentioned first voltage switching signal, that is, when the second comparator receives the first voltage switching signal sent by the first signal output terminal out1, the second comparator CMP2 is used to compare the output voltage with the second reference voltage received by the seventh input terminal in7, and the second reference voltage can be, for example, 1.5V, so that when the output voltage is less than the second reference voltage, that is, when the output voltage is detected to be less than 1.5V, the second signal output terminal out2 outputs a low-power exit signal and outputs a second preset amplitude charging signal to the power output module PO1, wherein the low-power exit signal is used to instruct the switching power supply circuit to exit the low-power mode, and the second preset amplitude charging signal is used to instruct the power output module PO1 to charge the voltage output terminal VOUT with a second preset amplitude, and the second preset amplitude voltage can be understood as a relatively large amplitude voltage, and the large amplitude voltage can be, for example, 0.4V or 0.5V voltage, etc. The specific voltage value can be set according to the actual circuit, and can be achieved through charging time or charging power control.

[0075] In addition, based on the second preset amplitude charging signal, the power output module PO1 continues to charge the voltage output terminal VOUT with the second preset amplitude, and the output voltage of the voltage output terminal VOUT is further charged and increased. At this time, when it is detected that the output voltage is not less than the second reference voltage, the second signal output terminal outputs a second preset amplitude stop charging signal. The second preset amplitude stop charging signal is used to instruct the power output module to stop charging the voltage output terminal with the second preset amplitude, that is, the second comparator is also used to determine whether the output voltage is greater than the second reference voltage, so that when the output voltage is greater than the second reference voltage, the second comparator is also used to instruct the power output module PO1 to stop charging the voltage output terminal VOUT with the second preset amplitude.

[0076] The second comparator CMP2 in the above embodiment can compare the output voltage with the received preset voltage according to the actual situation by setting the corresponding input terminal and the output terminal, so as to output the corresponding signal to drive the connected module. In addition, based on the above, the first preset amplitude charging signal is output through the first signal output terminal out1, so that the power output module PO1 first charges the voltage output terminal VOUT with a small amplitude, and then when it is detected that the output voltage after charging is less than the second preset voltage, the second preset amplitude charging signal is further sent through the second output terminal, so that the power output module PO1 charges the voltage output terminal VOUT with a large amplitude, thereby realizing that the switching power supply circuit will not drop significantly during the low power consumption mode, so as to improve the stability and reliability of the switching power supply circuit.

[0077] It should be noted that, in the above embodiments, the small amplitude voltage and the large amplitude voltage are, in actual applications, the small amplitude voltage value is smaller than the large amplitude voltage value, and the specific value can be set according to the actual circuit without specific limitation.

[0078] In one embodiment, Figure 4 As shown, the first detection module VD1 also includes a current detection module Currentsense and an overcurrent protection module OCP; wherein the first comparator CMP1 is further provided with a third input terminal in3, the third input terminal in3 is used to receive a first reference voltage, and the first reference voltage can be set to, for example, 1.5V; the overcurrent protection module OCP is provided with an eighth input terminal in8, a ninth input terminal in9, a tenth input terminal in10 and a third signal output terminal out3, and the third signal output terminal out3 is connected to the power output module PO1; the first signal output terminal out1 is also respectively connected to the input terminal of the current detection module Current sense and to the ninth input terminal in9 of the overcurrent protection module OCP, that is, the first signal output terminal out1 is connected to the input terminal of the current detection module Current sense, and the first signal output terminal out1 is also connected to the ninth input terminal in9 of the overcurrent protection module OCP, the current detection module Current The output end of sense is connected to the eighth input end in8 of the overcurrent protection module OCP, and the tenth input end in10 is used to receive the overcurrent protection preset current, so as to compare the detected current value with the overcurrent protection preset current and output a corresponding signal. In actual applications, the overcurrent protection preset current can be, for example, 1A or 1.5A, or other values, which can be selected according to the actual scenario without specific limitation.

[0079] Specifically, when it is detected that the output voltage of the voltage output terminal VOUT is less than the first preset voltage, the first detection module VD1 also controls the first signal output terminal out1 to output an enable signal indicating that the current detection module Current sense and the overcurrent protection module OCP are enabled, that is, under the action of the enable signal, the current detection module Current sense and the overcurrent protection module OCP are in an enabled working state, so that the current detection module Current sense detects the circuit current and the overcurrent protection module OCP protects the circuit.

[0080] Specifically, when the output signal value of the current detection module Current sense is greater than the overcurrent protection preset value, the current detection module Current sense instructs the third signal output terminal out3 of the overcurrent protection module OCP to output a first preset amplitude stop charging signal, and the stop charging signal is used to instruct the power output module PO1 to stop charging the voltage output terminal VOUT with a first preset amplitude.

[0081] In the above embodiment, when it is detected that the output voltage is less than the first preset voltage, a first preset amplitude charging signal is output based on the first signal output terminal out1 to instruct the power output module PO1 to charge the voltage output terminal VOUT with a first preset amplitude. Furthermore, the first signal output terminal is also used to output a second voltage switching signal.

[0082] Under the action of the second voltage switching signal, the first comparator CMP1 is used to compare the output voltage with a first reference voltage, which can be set to, for example, 1.5V, so that when the output voltage is greater than the first reference voltage, that is, when the output voltage is greater than 1.5V, the first detection module VD1 controls the first signal output terminal out1 to output a disabling signal indicating that the current detection module Current sense and the overcurrent protection module OCP are disabled.

[0083] It should be noted that the first reference voltage in the above embodiment is greater than the first preset voltage. The first reference voltage and the second reference voltage can be set to be equal.

[0084] In the above embodiment, by setting the current detection module Current sense and the overcurrent protection module OCP, the current detection module Current sense can detect the circuit condition in real time, so that when the current or voltage value exceeds the preset protection value, the overcurrent protection module OCP can further protect the circuit, thereby further improving the safety and stability reliability of the switching power supply circuit.

[0085] It should be noted that the various signals described in the above embodiments can be implemented by, for example, setting corresponding high-level signals or low-level signals, which will not be described in detail here to avoid redundancy.

[0086] In one embodiment, the power output module PO1 includes a power unit (not shown in the figure), and an energy storage inductor and / or energy storage capacitor (not shown in the figure) connected to the power unit, wherein:

[0087] The power unit is used to input charging electric energy to the energy storage unit, or the energy storage capacitor, or the energy storage unit and the energy storage capacitor. Specifically, the input electric energy of different capacities can be controlled by time control or power control, so that the voltage output terminal VOUT can be further charged through the energy storage unit, or the energy storage capacitor, or the energy storage unit and the energy storage capacitor.

[0088] In one embodiment, Figure 1 and Figure 2 As shown, the switching power supply circuit also includes a control module CT1 and a load power consumption detection module LD1; specifically, the control module CT1 is connected to the load power consumption detection module LD1 and the power output module PO1 respectively; when the control module CT1 is in an enabled state, that is, when the control module CT1 is in a working state, the power consumption detection module LD1 is used to detect the load according to the load information, wherein the load information can be a load voltage or a load current in the switching power supply circuit, etc. The specific method can be set according to the actual circuit and is not specifically limited here, so that when the detected load (voltage or current) is less than a preset value, the switching power supply circuit enters a low power consumption mode and the control module CT1 enters a disabled state.

[0089] In the above embodiment, by setting the control module CT1 and the load power consumption detection module LD1, when the power consumption detection module LD1 detects that the load voltage or load current is less than a preset value, the switching power supply circuit enters a low power consumption mode.

[0090] In one embodiment, Figure 1 and Figure 2 As shown, the switching power supply circuit may further include an energy storage module ES1, wherein the energy storage module ES1 may include a capacitor unit C1, wherein: the power output module PO1 is connected to the energy storage module ES1, and the energy storage module ES1 is connected to the voltage output terminal VOUT.

[0091] Specifically, the charging signal is used to instruct the power output module PO1 to charge the energy storage module ES1 , and the energy storage module ES1 to charge the voltage output terminal VOUT.

[0092] In the above embodiment, by providing an energy storage module ES1 in the switching power supply circuit, more electric energy can be further stored through the energy storage module ES1, so that the voltage output terminal VOUT can be charged through the energy storage module ES1, thereby improving the stability and reliability of the switching voltage circuit.

[0093] Example 2

[0094] A second aspect of the present application provides a control method for a switching power supply circuit, wherein the switching power supply circuit includes the switching power supply circuit of any one of the above-mentioned embodiments 1. In one embodiment, Figure 6 As shown, the control method includes:

[0095] S10: When the switching power supply circuit is in the low power consumption mode, the first detection module VD1 detects whether the output voltage of the voltage output terminal VOUT is less than a first preset voltage.

[0096] S20: When it is detected that the output voltage is less than the first preset voltage, the first detection module VD1 sends a first preset amplitude charging signal to the power output module PO1, and the first preset amplitude charging signal instructs the power output module PO1 to charge the voltage output terminal VOUT with the first preset amplitude.

[0097] In an application scenario, when the switching power supply circuit is in a low power consumption mode, the first detection module VD1 is configured to detect whether the output voltage of the voltage output terminal VOUT is less than a first preset voltage, which may be, for example, 1.48V, so that when the output voltage is detected to be less than, for example, 1.48V, the first detection module VD1 sends a first preset amplitude charging signal to the power output module PO1, so that the charging signal instructs the power output module PO1 to charge the voltage output terminal VOUT with the first preset amplitude.

[0098] S30: When the voltage output terminal VOUT is in the state of being charged and boosted, the second detection module VD2 detects whether the output voltage of the voltage output terminal VOUT is less than a second preset voltage.

[0099] S40: When it is detected that the output voltage is less than a second preset voltage, the switch power supply circuit exits the low power consumption mode; wherein the second preset voltage is less than the first preset voltage.

[0100] Based on the power output module PO1 in step S20 charging the voltage output terminal VOUT, specifically, when the voltage output terminal VOUT is in the state of being charged and boosted, the output voltage of the voltage output terminal VOUT can be detected by the second detection module VD2, so that when the detected output voltage is less than the second preset voltage, wherein the second preset voltage is less than the first preset voltage, illustratively, the second preset voltage can be, for example, 1.46V, that is, when the output voltage is detected to be less than 1.46V, the switching power supply circuit exits the low power consumption mode, and can be interactively controlled by setting the corresponding output signal, so that the switching power supply circuit receives the corresponding signal and exits the low power consumption mode, specifically, the description of the above embodiment 1 can be referred to, and in order to avoid redundancy, the description is not expanded here. When the output voltage is detected to be greater than or equal to the second preset voltage, the switching power supply circuit maintains the low power consumption mode.

[0101] In one embodiment, after step S40, that is, after it is detected that the output voltage is less than the second preset voltage, the control method may further include:

[0102] S50: The second detection module VD2 outputs a second preset amplitude charging signal to the power output module PO1, where the second preset amplitude charging signal is used to instruct the power output module PO1 to charge the voltage output terminal VOUT with a second preset amplitude.

[0103] Based on step S20, when it is detected that the output voltage is less than the first preset voltage, the first detection module VD1 sends a charging signal to the power output module PO1, and the charging signal instructs the power output module PO1 to charge the voltage output terminal VOUT. The charging signal can be understood as a first preset amplitude charging signal, that is, through the first preset amplitude charging signal, the power output module PO1 charges the voltage output terminal VOUT with a small amplitude. Further, in step S50, the second preset amplitude charging signal sent by the second detection module VD2 causes the power output module PO1 to charge the voltage output terminal VOUT with a large amplitude. To avoid redundancy, the description is not expanded here, and the specific description can be referred to the description in the above embodiment 1.

[0104] In the above embodiment, when the output voltage is detected to be less than the first preset voltage, the power output module PO1 charges the voltage output terminal VOUT by a small amount, so that when the output voltage is detected to be less than the second preset voltage, the power output module PO1 further charges the voltage output terminal VOUT by a large amount, so as to ensure that the switching power supply circuit will not drop significantly during the low power consumption mode, so as to improve the stability and reliability of the switching power supply circuit.

[0105] In one embodiment, before S10, the switching power supply circuit can enter the low power consumption mode in the following manner:

[0106] S01: The power consumption detection module LD1 detects load information.

[0107] S02: When it is detected that the current information is less than a preset value, the switching power supply circuit enters a low power consumption mode.

[0108] In the above steps S01 and S02, the load information can be the load voltage or load current in the switching power supply circuit, etc. The specific method can be set according to the actual circuit without specific limitation, so that when the detected load (voltage or current) is less than the preset value, the control module CT1 is in a disabled state and the switching power supply circuit enters a low power consumption mode.

[0109] Example 3

[0110] The third aspect of the present application provides a power supply device, wherein the power supply device includes the switching power supply circuit of any one of the above-mentioned embodiments 1. In one embodiment, the power supply device can be, for example, a smart watch or other electronic products suitable for low power consumption, etc., without specific limitation.

[0111] The power supply device of the present application, based on the switching power supply circuit of the above-mentioned embodiment 1, can improve the stability and reliability of the power supply device and further improve the user experience of the power supply device.

[0112] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A switching power supply circuit, characterized in that: It includes a power output module, a first detection module and a second detection module; The power output module is connected to the first detection module, and is also respectively connected to the voltage output terminal of the switching power supply circuit, and the first detection module is connected to the second detection module; When the switching power supply circuit is in a low power consumption mode, the first detection module is used to detect the output voltage of the voltage output terminal, so that when it is detected that the output voltage is less than a first preset voltage, the first detection module sends a charging signal to the power output module and sends a detection signal to the second detection module, and the charging signal is used to instruct the power output module to charge the voltage output terminal; When receiving the detection signal, the second detection module is used to detect the output voltage of the voltage output terminal, so that when it is detected that the output voltage is less than a second preset voltage, the switching power supply circuit exits the low power consumption mode; Wherein, the second preset voltage is smaller than the first preset voltage.

2. The switching power supply circuit according to claim 1, characterized in that: The first detection module includes a first comparator, the first comparator is provided with a first input terminal, a second input terminal and a first signal output terminal; the first signal output terminal is connected to the power output module; the voltage output terminal is connected to the first input terminal, and the second input terminal is used to receive the first preset voltage, wherein: When the switching power supply circuit is in the low power consumption mode, the first comparator is used to compare the output voltage of the voltage output terminal with the first preset voltage, so that when it is detected that the output voltage is less than the first preset voltage, the first signal output terminal outputs a first preset amplitude charging signal and the detection signal, and the first preset amplitude charging signal is used to instruct the power output module to charge the voltage output terminal with a first preset amplitude.

3. The switching power supply circuit according to claim 2, characterized in that: The second detection module includes a second comparator, the second comparator is provided with a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal and a second signal output terminal, the second signal output terminal is connected to the power output module; the voltage output terminal is connected to the fourth input terminal, the first signal output terminal is also connected to the fifth input terminal, the sixth input terminal is used to receive the second preset voltage, and the seventh input terminal is used to receive the second reference voltage, wherein: When receiving the detection signal, the second comparator is used to compare the output voltage with the second preset voltage, so that when it is detected that the output voltage is less than the second preset voltage, the second signal output terminal outputs a first voltage switching signal; Under the action of the first voltage switching signal, the second comparator is used to compare the output voltage with the second reference voltage, so that when the output voltage is less than the second reference voltage, the second signal output terminal outputs a low-power exit signal and a second preset amplitude charging signal, the low-power exit signal is used to instruct the switching power supply circuit to exit the low-power mode, and the second preset amplitude charging signal is used to instruct the power output module to charge the voltage output terminal with a second preset amplitude; and when the output voltage is not less than the second reference voltage, the second signal output terminal outputs a second preset amplitude stop charging signal, and the second preset amplitude stop charging signal is used to instruct the power output module to stop charging the voltage output terminal with a second preset amplitude.

4. The switching power supply circuit according to claim 2, characterized in that: The first detection module also includes a current detection module and an overcurrent protection module; the first comparator is also provided with a third input terminal, and the third input terminal is used to receive a first reference voltage; the overcurrent protection module is provided with an eighth input terminal, a ninth input terminal, a tenth input terminal and a third signal output terminal, and the third signal output terminal is connected to the power output module; the first signal output terminal is also respectively connected to the input terminal of the current detection module and the ninth input terminal, the output terminal of the current detection module is connected to the eighth input terminal, and the tenth input terminal is used to receive an overcurrent protection preset current, wherein: When it is detected that the output voltage is less than the first preset voltage, the first signal output terminal is further used to output an enable signal indicating that the current detection module and the overcurrent protection module are enabled, so that when the output signal value of the current detection module is greater than the overcurrent protection preset current value, the current detection module instructs the third signal output terminal of the overcurrent protection module to output a first preset amplitude stop charging signal, and the first preset amplitude stop charging signal is used to instruct the power output module to stop charging the voltage output terminal with a first preset amplitude; After the first signal output terminal outputs the first preset amplitude charging signal, the first signal output terminal is further used to output a second voltage switching signal; Under the action of the second voltage switching signal, the first comparator is used to compare the output voltage with the first reference voltage, so that when the output voltage is greater than the first reference voltage, the first signal output terminal outputs a disabling signal indicating that the current detection module and the overcurrent protection module are disabled; Wherein, the first reference voltage is greater than the first preset voltage.

5. The switching power supply circuit according to any one of claims 1 to 4, characterized in that: The power output module includes a power unit, and an energy storage inductor and / or energy storage capacitor connected to the power unit, wherein: The power unit is used to input charging energy to the energy storage inductor and / or the energy storage capacitor.

6. The switching power supply circuit according to any one of claims 1 to 4, characterized in that: The switching power supply circuit also includes an energy storage module, wherein: The power output module is connected to the energy storage module, and the energy storage module is connected to the voltage output terminal; The charging signal is used to instruct the power output module to charge the energy storage module, and the energy storage module to charge the voltage output terminal.

7. The switching power supply circuit according to any one of claims 1 to 4, characterized in that: The switching power supply circuit also includes a control module and a load power consumption detection module; The control module is connected to the load power consumption detection module and the power output module respectively; When the control module is in an enabled state, the power consumption detection module is used to detect the load according to the load information, so that when the load is detected to be less than a preset value, the switching power supply circuit enters a low power consumption mode and the control module enters a disabled state.

8. A control method for a switching power supply circuit, characterized in that: The switching power supply circuit comprises the switching power supply circuit as claimed in any one of claims 1 to 7 above, and the control method comprises: When the switching power supply circuit is in a low power consumption mode, the first detection module detects whether the output voltage of the voltage output terminal is less than a first preset voltage; When it is detected that the output voltage is less than the first preset voltage, the first detection module sends a first preset amplitude charging signal to the power output module, and the first preset amplitude instructs the power output module to charge the voltage output end with a first preset amplitude; When the voltage output terminal is in the state of being charged and boosted, the second detection module detects whether the output voltage of the voltage output terminal is less than a second preset voltage; When it is detected that the output voltage is less than the second preset voltage, the switching power supply circuit exits the low power consumption mode; Wherein, the second preset voltage is smaller than the first preset voltage.

9. The control method according to claim 8, characterized in that: After detecting that the output voltage is less than the second preset voltage, the control method further includes: The second detection module sends a second preset amplitude charging signal to the power output module; The second preset amplitude instructs the power output module to charge the voltage output end with a second preset amplitude.

10. A power supply device, characterized in that: The power supply device comprises the switching power supply circuit according to any one of claims 1 to 7.

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