Stability adjusting circuit, method and device, switching power supply and electric equipment

Abstract

The invention discloses a stability adjusting circuit, method and device, a switching power supply and electric equipment. The stability adjusting circuit is applied to the BUCK circuit, the BUCK circuit comprises a first switching tube, an inductor, a diode, a capacitor and a control chip, the control chip is used for sending a PWM signal to control the first switching tube to be switched on or switched off, and the stability adjusting circuit comprises an adjusting module, a first control module and a second control module, and the voltage reduction circuit is arranged between the grid electrode of the first switch tube and the cathode of the diode, and is used for reducing the voltage difference between the grid electrode and the source electrode of the first switch tube when the PWM signal input by the first switch tube is a turn-off signal. According to the BUCK circuit, the problem that the main loop switch tube of the BUCK circuit is mistakenly conducted in the time period when the main loop switch tube should be turned off can be avoided, and therefore the accuracy and stability of the output voltage of the BUCK circuit are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a stability regulation circuit, method, device, switching power supply and electrical equipment. Background Art

[0002] With the continuous development of the electronics industry, switching power supplies are being used in many fields due to their high efficiency, small size, light weight and other advantages. Among them, topology circuits such as Boost and Buck are very mature and widely used, but they still encounter some technical problems in actual use. Therefore, stability has become an important indicator for measuring switching power supplies.

[0003] At present, the BUCK circuit is widely used in various product fields due to its high efficiency and wide input voltage range. Its working principle is to use pulse width modulation technology to control the switch of the MOS tube to control the on-time of the input power supply, and the effect of inductance and capacitance to achieve the purpose of high voltage input and low voltage output. However, in actual use, the MOS tube will be mis-conducted under certain specific circumstances, causing circuit abnormalities. For example, during the operation of the BUCK circuit, when the MOS tube is turned off, due to the electrical characteristics of the diode, a negative voltage will be formed at the source of the MOS tube. If the voltage difference between the gate and source of the MOS tube is greater than the turn-on voltage threshold at this time, the MOS tube will be mis-conducted during the period when it should be turned off, affecting the stability of the system.

[0004] In the prior art, when the MOS tube in the Buck circuit is turned off, a negative voltage is formed at its source, and the voltage difference between the gate and the source is too large, causing the MOS tube to be mistakenly turned on during the period when it should be turned off. No effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a stability regulation circuit, method, device, switching power supply and electrical equipment to solve the problem in the prior art that when a MOS tube in a Buck circuit is turned off, a negative voltage is formed at its source, and the voltage difference between the gate and the source is too large, causing the MOS tube to be mis-turned on during a period when it should be turned off.

[0006] In order to solve the above technical problems, the present invention provides a stability adjustment circuit, which is applied to a BUCK circuit. The BUCK circuit includes a first switch tube, an inductor, a diode, a capacitor and a control chip. The control chip is used to send a PWM signal to control the on or off of the first switch tube. The stability adjustment circuit includes:

[0007] The regulating module is arranged between the gate of the first switch tube and the cathode of the diode, and is used to reduce the voltage difference between the gate and the source of the first switch tube when the PWM signal input to the first switch tube is a shutdown signal.

[0008] Furthermore, the adjustment module includes:

[0009] a second switch tube, wherein the drain of the second switch tube is connected to the gate of the first switch tube, the gate of the second switch tube is connected to the third end of the voltage divider circuit, and the source of the second switch tube is connected to the cathode of the diode;

[0010] The voltage dividing unit has a first end connected to a voltage source and a second end connected to a ground line;

[0011] A switch is connected to a loop formed by the voltage source, the voltage dividing unit and the ground wire, and a control end of the switch is connected to the control chip; the control chip is used to control the switch to be turned on when the PWM signal input by the first switch tube is a shutdown signal.

[0012] Further, the voltage dividing unit includes at least two voltage dividing resistors;

[0013] The gate of the second switch tube is connected between any two voltage-dividing resistors of the voltage-dividing unit.

[0014] The present invention also provides a BUCK circuit, comprising the above stability adjustment circuit.

[0015] The present invention also provides a switching power supply, comprising the above-mentioned BUCK circuit.

[0016] The present invention also provides an electrical device, comprising the switching power supply.

[0017] The present invention further provides a stability adjustment method, which is applied to a BUCK circuit. The BUCK circuit includes the above stability adjustment circuit. The stability adjustment method includes:

[0018] Determine whether the PWM signal input by the first switch tube is a turn-on signal or a turn-off signal;

[0019] If the PWM signal input by the first switch tube is a shutdown signal, the control and regulation module operates to reduce the voltage difference between the gate and the source of the first switch tube;

[0020] Wherein, the regulating module is arranged between the gate of the first switch tube and the cathode of the diode.

[0021] The present invention further provides a stability adjustment device, which is applied to a BUCK circuit. The BUCK circuit includes the above stability adjustment circuit. The stability adjustment device includes:

[0022] A judgment module, used for judging whether the PWM signal input by the first switch tube is a turn-on signal or a turn-off signal;

[0023] A control module, used for controlling the regulating module to operate when the PWM signal inputted by the first switch tube is a shutdown signal, so as to reduce the voltage difference between the gate and the source of the first switch tube;

[0024] Wherein, the regulating module is arranged between the gate of the first switch tube and the cathode of the diode.

[0025] The present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the above stability adjustment method is implemented.

[0026] The present invention further provides an electronic device, characterized in that it comprises:

[0027] one or more processors;

[0028] A storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned stability adjustment method.

[0029] By applying the technical solution of the present invention, a regulating module is arranged between the gate of the main circuit switch tube of the BUCK circuit and the cathode of the diode. When the PWM signal input to the main circuit switch tube is a shutdown signal, the voltage difference between the gate and the source of the main circuit switch tube is reduced by the reducing module 10, so that the voltage difference between the gate and the source of the main circuit switch tube is smaller than its conduction voltage, thereby ensuring that the main circuit switch tube is in the off state, avoiding the problem of the main circuit switch tube being mis-turned on during the period when it should be turned off, thereby improving the accuracy and stability of the output voltage of the BUCK circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the structural diagram of the existing BUCK circuit;

[0031] Figure 2 A schematic diagram of the current direction when the switch tube of the existing BUCK circuit is in the on state;

[0032] Figure 3 A schematic diagram of the current direction when the switch tube of the existing BUCK circuit is turned off;

[0033] Figure 4 is a structural diagram of a stability adjustment circuit according to an embodiment of the present invention;

[0034] Figure 5 is a flow chart of a stability adjustment method according to an embodiment of the present invention;

[0035] Figure 6 is a structural block diagram of a stability adjustment device according to an embodiment of the present invention;

[0036] Figure 7 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0039] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] It should be understood that although the terms first, second, etc. may be used to describe the switch tubes in the embodiments of the present invention, the switch tubes should not be limited to these terms. These terms are only used to distinguish different switch tubes. For example, without departing from the scope of the embodiments of the present invention, the first switch tube Q1 may also be referred to as the second switch tube Q2, and similarly, the second switch tube Q2 may also be referred to as the first switch tube Q1.

[0041] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0042] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0043] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] Example 1

[0045] At present, the BUCK circuit is widely used in various product fields due to its high efficiency and wide input voltage range. Its working principle is to use pulse width modulation technology to control the switch of MOS tube to control the on-time of input power supply, and add the role of inductance and capacitance to achieve the purpose of high voltage input and low voltage output. However, in actual use, MOS tubes may be mis-conducted in certain specific situations, resulting in circuit abnormalities.

[0046] Figure 1 The structure diagram of the existing BUCK circuit is as follows: Figure 1 As shown, the BUCK circuit includes a first switch tube Q1, an inductor L1, a diode D1, a capacitor C1 and a control chip IC. The control chip IC is used to send a PWM signal to control the on or off of the first switch tube Q1.

[0047] Figure 2 FIG. 1 is a schematic diagram of the current direction when the switch tube of the existing BUCK circuit is in the on state, as shown in FIG. Figure 2 As shown, when the PWM signal output by the control chip IC is at a high level, the first switch tube Q1 is closed, the circuit is turned on, the diode D1 is cut off, and the current of the inductor L1 rises slowly. At this time, the polarity of the inductor L1 is positive on the left and negative on the right.

[0048] Figure 3 FIG. 1 is a schematic diagram of the current direction of the switch tube of the existing BUCK circuit when it is turned off. Figure 3 As shown, when the PWM signal changes from a high level to a low level, the first switch tube Q1 is turned off. At this time, due to its own characteristics, the polarity of the inductor L1 changes to negative on the left and positive on the right, and the diode D1 is turned on. At this time, the inductor L1 and the capacitor C1 discharge to the load through the diode D1. As long as the proportion of high and low levels in one cycle is controlled, the high voltage can be converted into a low voltage.

[0049] The above-mentioned BUCK circuit has the following problems in actual operation. When the PWM signal output by the chip is at a low level, the first switch tube Q1 is turned off. At this time, the inductor L1 and the capacitor C1 form a loop through the diode D1 to discharge the load. At this time, the voltage V1 of the cathode of the diode D1 is -Vd1 (where Vd1 is the voltage drop across the diode D1), and the voltage of the source of the MOS tube is also -Vd1, that is, a negative voltage is formed. If the gate voltage V2-(-Vd1) of the first switch tube Q1 is greater than the conduction threshold VQ1on of the first switch tube Q1 at this time, the first switch tube Q1 will be turned on, causing the first switch tube Q1 to be turned on during the period when it should be turned off, thereby causing the circuit output voltage to be abnormal.

[0050] In summary, during the operation of the BUCK circuit, when the first switch tube Q1 is turned off, due to the electrical characteristics of the diode D1, a negative voltage will be formed at the source of the first switch tube Q1. If the voltage difference between the gate and the source of the first switch tube Q1 is greater than the turn-on voltage threshold VQ1on of the first switch tube Q1, the first switch tube Q1 will be mistakenly turned on during the period when it should be turned off, thereby causing abnormal output voltage of the switching power supply.

[0051] In order to solve the above technical problems, this embodiment provides a stability adjustment circuit, which is applied to the above BUCK circuit. Figure 4 is a structural diagram of a stability adjustment circuit according to an embodiment of the present invention. Figure 4 As shown, the stability adjustment circuit includes:

[0052] The regulating module 10 is arranged between the gate of the first switch tube Q1 and the cathode of the diode D1, and is used to reduce the voltage difference between the gate and the source of the first switch tube Q1 when the PWM signal input to the first switch tube Q1 is a shutdown signal.

[0053] In the stability adjustment circuit of the present embodiment, an adjustment module 10 is arranged between the gate of the first switch tube Q1 and the cathode of the diode D1. When the PWM signal input to the first switch tube Q1 is a shutdown signal, the voltage difference between the gate and the source of the first switch tube Q1 is reduced by the reduction module 10, so that the voltage difference between the gate and the source of the first switch tube Q1 is smaller than the turn-on voltage of the first switch tube Q1, thereby ensuring that the first switch tube Q1 is in the off state, avoiding the problem of the first switch tube Q1 being mis-turned on during the period when it should be turned off, thereby improving the accuracy and stability of the output voltage of the BUCK circuit.

[0054] As mentioned above Figure 4 As shown in , the regulating module 10 includes: a second switch tube Q2, whose drain is connected to the gate of the first switch tube Q1, whose gate is connected to the third end of the voltage divider circuit, and whose source is connected to the cathode of the diode D1;

[0055] A voltage dividing unit 101, whose first end is connected to a voltage source and whose second end is connected to the ground wire GND;

[0056] A switch K1 is connected into the loop formed by the voltage source, the voltage dividing unit 101, and the ground wire GND. The control end of the switch K1 is connected to a control chip IC; the control chip IC is used to control the switch K1 to conduct when the PWM signal input by the first switching transistor Q1 is an off signal. It should be noted that depending on the type of the first switching transistor Q1, it can be configured such that the on signal is a high level and the off signal is a low level, or it can be configured such that the on signal is a low level and the off signal is a high level. In this embodiment, the on signal is a high level and the off signal is a low level.

[0057] In this embodiment, the switch K1 is a relay or a controllable switch.

[0058] Since the voltage output by the voltage source may be relatively high, in order to avoid damage to the second switching transistor Q2, it is necessary to divide the voltage provided by the voltage source. To achieve the voltage dividing effect, the above voltage dividing unit 101 includes at least two voltage dividing resistors; the gate of the second switching transistor Q2 is connected between any two voltage dividing resistors of the voltage dividing unit 101. In this embodiment, the voltage dividing unit 101 includes two voltage dividing resistors, a first voltage dividing resistor R1 and a second voltage dividing resistor R2.

[0059] In the stability adjustment circuit of this embodiment, a second switching transistor Q2 is added to the cathode of the gate diode D1 of the first switching transistor Q1. The gate of the second switching transistor Q2 is connected to the voltage dividing unit 101. The first end of the voltage dividing unit 101 is connected to the voltage source. The voltage V4 output by the voltage source can be designed according to actual applications and is divided by at least two voltage dividing resistors. The resistance values of the two voltage dividing resistors can be configured according to actual needs to ensure that the gate voltage V3 - (-Vd1) > VQ2on of the second switching transistor Q2, and V3 - Vin < Vq2on, where VQ2on is the on threshold voltage of the second switching transistor Q2 and Vin is the input voltage of the BUCK circuit.

[0060] As Figure 4 shown, when the control chip IC outputs a low level, the first switching transistor Q1 turns off. Due to its own characteristics, the polarity of the inductor L1 becomes negative on the left and positive on the right. At this time, the voltage at point V1 is -Vd1. The control chip IC outputs a control signal to control the switch K1 to conduct. For the second switching transistor Q2, V3 - (-Vd1) > VQ2on, and the second switching transistor Q2 conducts. The gate of the first switching transistor Q1 is short-circuited with the cathode of the diode D1. At this time, the gate voltage V2 of the first switching transistor Q1 = V1 = -Vd1. For the first switching transistor Q1, V2 - V1 < VQ1on, so the first switching transistor Q1 will not be mis-triggered at this time.

[0061] When the control chip IC outputs a high level, the first switching transistor Q1 conducts, the voltage V1 at the cathode of the diode D1 = Vin, the diode D1 is cut off, the control chip IC controls the switch K1 to turn off. For the second switching transistor Q2, V3 - V1 < VQ2on, and the second switching transistor Q2 is turned off. That is, the stability adjustment circuit of this embodiment is used to ensure that during the period when the control chip IC outputs a low level, the first switching transistor Q1 will not be mis-conducted and will not affect the high-level period.

[0062] In summary, the stability adjustment circuit of this embodiment further sets a switching transistor and a voltage dividing circuit composed of at least two resistors in the BUCK circuit. By controlling the second switching transistor Q2 to conduct during the period when a low level is input to the gate of the first switching transistor Q1, the problem that the first switching transistor Q1 is mis-conducted during the turn-off period due to the negative voltage at the source is solved.

[0063] Embodiment 2

[0064] This embodiment provides a BUCK circuit, including the stability adjustment circuit of the above embodiment, which is used to reduce the voltage difference between the gate and the source of the first switching transistor Q1 by the reduction module 10 when the PWM signal input to the first switching transistor Q1 is an off signal, so that the voltage difference between the gate and the source of the first switching transistor Q1 is less than the conduction voltage of the first switching transistor Q1, thereby ensuring that the first switching transistor Q1 is in an off state and avoiding the problem that the first switching transistor Q1 is mis-conducted during the period when it should be turned off, thus improving the accuracy and stability of the output voltage of the BUCK circuit.

[0065] Embodiment 3

[0066] This embodiment provides a switching power supply, including the BUCK circuit of the above embodiment, which is used to reduce the voltage difference between the gate and the source of the first switching transistor Q1 by the reduction module 10 when the PWM signal input to the first switching transistor Q1 is an off signal, so that the voltage difference between the gate and the source of the first switching transistor Q1 is less than the conduction voltage of the first switching transistor Q1, thereby ensuring that the first switching transistor Q1 is in an off state and avoiding the problem that the first switching transistor Q1 is mis-conducted during the period when it should be turned off, thus improving the accuracy and stability of the output voltage of the BUCK circuit and further improving the stability of the entire switching power supply.

[0067] Embodiment 4

[0068] The present embodiment provides an electrical device, including the switching power supply of the above embodiment, which is used for reducing the voltage difference between the gate and the source of the first switching tube Q1 by the reducing module 10 when the PWM signal input to the first switching tube Q1 is a shutdown signal, so that the voltage difference between the gate and the source of the first switching tube Q1 is less than the turn-on voltage of the first switching tube Q1, thereby ensuring that the first switching tube Q1 is in the off state, avoiding the problem of the first switching tube Q1 being mis-turned on during the period when it should be turned off, thereby improving the accuracy and stability of the output voltage of the BUCK circuit, thereby improving the stability of the entire switching power supply, and thereby improving the stability of the entire electrical device.

[0069] Example 5

[0070] This embodiment provides a stability adjustment method, which is applied to a BUCK circuit. The BUCK circuit includes the stability adjustment circuit of the above embodiment. Figure 5 is a flow chart of a stability adjustment method according to an embodiment of the present invention. Figure 5 As shown, the stability adjustment method includes:

[0071] S101, determining whether the PWM signal input to the first switch tube Q1 is a turn-on signal or a turn-off signal.

[0072] It should be noted that, depending on the type of the first switch tube Q1, the on signal can be configured to be high level and the off signal to be low level, or the on signal can be configured to be low level and the off signal to be high level. In this embodiment, the on signal is high level and the off signal is low level.

[0073] S102, if the PWM signal input to the first switch tube Q1 is a shutdown signal, the regulating module is controlled to work to reduce the voltage difference between the gate and the source of the first switch tube Q1; wherein the regulating module is arranged between the gate of the first switch tube Q1 and the cathode of the diode D1.

[0074] S103, if the PWM signal input to the first switch tube Q1 is a conduction signal, the control and regulation module does not work, so that the voltage difference between the gate and the source of the first switch tube Q1 remains unchanged.

[0075] In the stability adjustment method of this embodiment, when the PWM signal input to the first switch tube Q1 is a shutdown signal, the voltage difference between the gate and the source of the first switch tube Q1 is reduced by the reduction module 10, so that the voltage difference between the gate and the source of the first switch tube Q1 is less than the turn-on voltage of the first switch tube Q1, thereby ensuring that the first switch tube Q1 is in the off state, avoiding the problem of the first switch tube Q1 being mis-turned on during the period when it should be turned off, thereby improving the accuracy and stability of the output voltage of the BUCK circuit.

[0076] Specifically, when the control chip IC outputs a low level, the first switching transistor Q1 is turned off. Due to its own characteristics, the polarity of the inductor L1 becomes negative on the left and positive on the right. At this time, the voltage at point V1 is -Vd1. The control chip IC outputs a control signal to control the switch K1 to conduct. For the second switching transistor Q2, V3 - (-Vd1) > VQ2on, so the second switching transistor Q2 conducts, and the gate of the first switching transistor Q1 is shorted to the cathode of the diode D1. At this time, the gate voltage V2 of the first switching transistor Q1 is V1 = -Vd1. For the first switching transistor Q1, V2 - V1 < VQ1on, so the first switching transistor Q1 will not be mis-conducted at this time.

[0077] When the control chip IC outputs a high level, the first switching transistor Q1 conducts, and the voltage V1 at the cathode of the diode D1 is Vin, and the diode D1 is cut off. The control chip IC controls the switch K1 to turn off. For the second switching transistor Q2, V3 - V1 < VQ2on, so the second switching transistor Q2 is turned off. That is, the stability adjustment circuit of this embodiment is used to ensure that the first switching transistor Q1 will not be mis-conducted during the period when the control chip IC outputs a low level and has no influence on the high-level period.

[0078] Embodiment 6

[0079] This embodiment provides a stability adjustment device applied to a BUCK circuit. The BUCK circuit includes the stability adjustment circuit of the above embodiment. Figure 6 It is a structural block diagram of the stability adjustment device according to an embodiment of the present invention, as Figure 6 shown. The above stability adjustment device includes:

[0080] A judgment module 10 for judging whether the PWM signal input to the first switching transistor Q1 is a conduction signal or a cut-off signal;

[0081] A first control module 20 for controlling the adjustment module to work to reduce the voltage difference between the gate and the source of the first switching transistor Q1 when the PWM signal input to the first switching transistor Q1 is a cut-off signal; wherein, the adjustment module is arranged between the gate of the first switching transistor Q1 and the cathode of the diode D1.

[0082] A second control module 30 for controlling the adjustment module not to work to keep the voltage difference between the gate and the source of the first switching transistor Q1 unchanged when the PWM signal input to the first switching transistor Q1 is a cut-off signal.

[0083] When the PWM signal input to the first switching transistor Q1 is an off signal, the stability adjustment device of this embodiment reduces the voltage difference between the gate and source of the first switching transistor Q1 by reducing module 10, making the voltage difference between the gate and source of the first switching transistor Q1 less than the conduction voltage of the first switching transistor Q1, thereby ensuring that the first switching transistor Q1 is in the off state and avoiding the problem of mis-conduction of the first switching transistor Q1 during the period when it should be off, thus improving the accuracy and stability of the output voltage of the BUCK circuit.

[0084] Specifically, when the control chip IC outputs a low level, the first switching transistor Q1 is turned off. Due to its own characteristics, the polarity of the inductor L1 becomes negative on the left and positive on the right. At this time, the voltage at point V1 is -Vd1. The control chip IC outputs a control signal to control the switch K1 to conduct. For the second switching transistor Q2, V3 - (-Vd1) > VQ2on, so the second switching transistor Q2 conducts, and the gate of the first switching transistor Q1 is shorted to the cathode of the diode D1. At this time, the gate voltage V2 of the first switching transistor Q1 = V1 = -Vd1. For the first switching transistor Q1, V2 - V1 < VQ1on, so the first switching transistor Q1 will not be mis-conducted at this time.

[0085] When the control chip IC outputs a high level, the first switching transistor Q1 conducts, the voltage V1 at the cathode of the diode D1 = Vin, and the diode D1 is turned off. The control chip IC controls the switch K1 to turn off. For the second switching transistor Q2, V3 - V1 < VQ2on, so the second switching transistor Q2 is turned off. That is, the stability adjustment circuit of this embodiment is used to ensure that the first switching transistor Q1 will not be mis-conducted during the period when the control chip IC outputs a low level and has no influence on the high-level period.

[0086] Embodiment 7

[0087] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the stability adjustment method of the above embodiment is implemented.

[0088] Embodiment 8

[0089] This embodiment provides an electronic device, including:

[0090] One or more processors;

[0091] A storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement the above stability adjustment method.

[0092] Figure 7 As shown in the hardware structure diagram of the electronic device according to the embodiment of the present invention, Figure 7 as shown, the electronic device includes:

[0093] One or more processors 710 and memory 720, Figure 7 A processor 710 is taken as an example.

[0094] The electronic device may further include: an input device 730 and an output device 740 .

[0095] The processor 710, the memory 720, the input device 730 and the output device 740 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0096] The memory 720 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the stability adjustment method in the embodiment of the present invention. The processor 710 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 720, that is, implementing the above method embodiment.

[0097] The memory 720 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the stability adjustment device, etc. In addition, the memory 720 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0098] The input device 730 may receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 740 may include a display device such as a display screen.

[0099] The one or more modules are stored in the memory 720, and when executed by the one or more processors 710, the stability adjustment method in any of the above method embodiments is executed.

[0100] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0101] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0102] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0103] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0104] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0105] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0106] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0107] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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. However, 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 invention.

Claims

1. A stability adjustment circuit, applied to a BUCK circuit, the BUCK circuit comprising a first switch tube, an inductor, a diode, a capacitor and a control chip, the control chip is used to send a PWM signal to control the on or off of the first switch tube, characterized in that: The stability adjustment circuit comprises: The regulating module is arranged between the gate of the first switch tube and the cathode of the diode, and is used to reduce the voltage difference between the gate and the source of the first switch tube when the PWM signal input to the first switch tube is a shutdown signal.

2. The stability adjustment circuit according to claim 1, characterized in that: The adjustment module comprises: a second switch tube, wherein the drain of the second switch tube is connected to the gate of the first switch tube, the gate of the second switch tube is connected to the third end of the voltage divider circuit, and the source of the second switch tube is connected to the cathode of the diode; The voltage dividing unit has a first end connected to a voltage source and a second end connected to a ground line; A switch is connected to a loop formed by the voltage source, the voltage dividing unit and the ground wire, and a control end of the switch is connected to the control chip; the control chip is used to control the switch to be turned on when the PWM signal input by the first switch tube is a shutdown signal.

3. The stability adjustment circuit according to claim 1, characterized in that: The voltage dividing unit includes at least two voltage dividing resistors; The gate of the second switch tube is connected between any two voltage-dividing resistors of the voltage-dividing unit.

4. A BUCK circuit, characterized in that: The invention comprises the stability adjustment circuit according to any one of claims 1 to 3.

5. A switching power supply, characterized in that: Includes the BUCK circuit described in claim 4.

6. An electrical equipment, characterized in that: Including the switching power supply described in claim 5.

7. A stability adjustment method, applied to a BUCK circuit, wherein the BUCK circuit comprises the stability adjustment circuit according to any one of claims 1 to 3, characterized in that: The stability adjustment method comprises: Determine whether the PWM signal input by the first switch tube is a turn-on signal or a turn-off signal; If the PWM signal input by the first switch tube is a shutdown signal, the control and regulation module operates to reduce the voltage difference between the gate and the source of the first switch tube; Wherein, the regulating module is arranged between the gate of the first switch tube and the cathode of the diode.

8. A stability adjustment device, applied to a BUCK circuit, wherein the BUCK circuit comprises the stability adjustment circuit according to any one of claims 1 to 3, characterized in that: The stability adjustment device comprises: A judgment module, used for judging whether the PWM signal input by the first switch tube is a turn-on signal or a turn-off signal; A control module, used for controlling the regulating module to operate when the PWM signal inputted by the first switch tube is a shutdown signal, so as to reduce the voltage difference between the gate and the source of the first switch tube; Wherein, the regulating module is arranged between the gate of the first switch tube and the cathode of the diode.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to claim 7 is implemented.

10. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method according to claim 7.

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