Pass-through shutdown circuit, switching power supply, and electronic device

Abstract

This application belongs to the field of electronic circuits and provides a direct-turn-off circuit, a switching power supply, and an electronic device. The circuit includes a charge pump module, n direct-power modules, and n drive modules. The n drive modules are connected one-to-one with the n direct-power modules, and the charge pump module is connected to each of the n drive modules. This application divides the direct-power transistors into n direct-power modules, and drives the n direct-power modules through the n drive modules. When the battery power supply circuit switches from direct-mode to boost mode, the n drive modules control the n direct-power modules to turn off sequentially at preset time intervals. During the process of turning off the n direct-power modules, the inductor current rises in a step-like manner, and the boost power transistor can slowly accept the load current, completely absorbing the current turned off by the direct-power modules, while preventing the output voltage from discharging through the load capacitor, thereby reducing the drop in output voltage and ensuring a smooth switch of the power supply circuit from direct-mode to boost mode.

Description

Technical Field

[0001] This application belongs to the field of electronic circuit technology, and particularly relates to a direct-on shutdown circuit, a switching power supply, and an electronic device. Background Technology

[0002] With the rapid development of technology, DC-DC switching power supplies have been widely used in various electronic devices, with smartphones in the consumer electronics field being a typical example. Some mobile phones' battery power supply circuits include Boost and Bypass circuits, and stable switching between Boost and Bypass modes is crucial for the normal operation of the device. However, when the battery power supply circuit switches from Bypass to Boost mode, the boost power transistor is momentarily turned off, and the inductor current cannot change abruptly. Therefore, it takes some time for the boost power transistor to reach the load current. During this process, the load capacitor needs to discharge, resulting in a significant drop in output voltage, which negatively impacts battery power supply. Summary of the Invention

[0003] This application provides a through-shutdown circuit, a switching power supply, and an electronic device that can solve the problem of a large drop in output voltage when switching from Bypass mode to Boost mode.

[0004] In a first aspect, embodiments of this application provide a through-shutdown circuit, including a charge pump module, n through-power modules, and n drive modules. The n drive modules are connected one-to-one with the n through-power modules. The charge pump module is connected to each of the n drive modules. Each of the n through-power modules is used to connect to an output node in a battery power supply circuit. Each of the n through-power modules is also used to receive an input voltage. The charge pump module and the n drive modules are both used to receive a first voltage; where n is an integer greater than or equal to 2.

[0005] The charge pump module is used to output a second voltage according to the first voltage; when the battery power supply circuit switches from through mode to boost mode, the first drive module is used to receive the second voltage, the first signal and the first enable signal, and output a first shutdown signal according to the first voltage, the second voltage, the first signal and the first enable signal to control the corresponding first through power module to shut down; the second drive module is used to receive the second voltage, the second signal and the second enable signal, and output a second shutdown signal according to the first voltage, the second voltage, the second signal and the second enable signal after a preset time interval to control the corresponding second through power module to shut down; and so on, the nth drive module is used to receive the second voltage, the nth signal and the nth enable signal, and output an nth shutdown signal according to the first voltage, the second voltage, the nth signal and the nth enable signal after n-1 times the preset time interval to control the corresponding nth through power module to shut down.

[0006] In one possible implementation of the first aspect, when the battery power supply circuit switches from boost mode to pass-through mode, the first driving module is further configured to output a first turn-on signal according to the first voltage, the second voltage, the first signal, and the first enable signal; the second driving module is further configured to output a second turn-on signal according to the first voltage, the second voltage, the second signal, and the second enable signal; and so on, the nth driving module is further configured to output an nth turn-on signal according to the first voltage, the second voltage, the nth signal, and the nth enable signal; the first turn-on signal, the second turn-on signal, ..., the nth turn-on signal are used to control the corresponding first pass-through power module, the corresponding second pass-through power module, ..., the corresponding nth pass-through power module to be turned on simultaneously.

[0007] In one possible implementation of the first aspect, the a-th driving module includes an a-th level conversion unit, an a-th inverting unit, an a-th first switching unit, and an a-th second switching unit. The a-th first switching unit is connected to the a-th inverting unit, the a-th second switching unit, and the a-th through-power module, respectively. The a-th second switching unit and the a-th level conversion unit are both connected to the charge pump module, and the a-th level conversion unit is connected to the a-th second switching unit.

[0008] When the battery power supply circuit switches from through mode to boost mode, the a-th inverting unit receives the a-th enable signal, inverts the a-th enable signal, and outputs the a-th inverted signal; the a-th first switching unit is turned on according to the a-th inverted signal after a-1 times a preset time interval, and outputs the a-th turn-off signal to control the turn-off of the corresponding a-th through power module; the a-th level conversion unit receives the first voltage, the second voltage, and the a-th signal, and outputs the a-th level signal according to the a-th signal, wherein the a-th level signal is the first voltage or the second voltage; when the a-th through power module 20 is turned off, the a-th level signal is the second voltage to control the turn-off of the a-th second switching unit; where 1≤a≤n.

[0009] In one possible implementation of the first aspect, the a-th inverter unit includes an a-th inverter, the input of which is used to receive the a-th enable signal, and the output of which is connected to the a-th first switching unit.

[0010] In one possible implementation of the first aspect, the a-th first switching unit includes an a-th first transistor, the gate of the a-th first transistor is connected to the a-th inverting unit, the source of the a-th first transistor is grounded, and the drain of the a-th first transistor is connected to the a-th second switching unit and the a-th through power module, respectively.

[0011] In one possible implementation of the first aspect, the a-th second switching unit includes an a-th second transistor, the gate of the a-th second transistor is connected to the a-th level conversion unit, the drain of the a-th second transistor is connected to the a-th first switching unit and the a-th through power module, and the source of the a-th second transistor is connected to the a-th level conversion unit and the charge pump module.

[0012] In one possible implementation of the first aspect, the a-th first transistor is an NMOS transistor and the a-th second transistor is a PMOS transistor.

[0013] In one possible implementation of the first aspect, the a-th through power module includes an a-th third transistor, the gate of which is connected to the a-th driving module, the source of which is used to receive an input voltage, and the drain of which is used to connect to the output node of the battery-powered circuit; where 1≤a≤n.

[0014] Secondly, embodiments of this application provide a switching power supply, including the through-shutdown circuit described in any one of the first aspects.

[0015] Thirdly, embodiments of this application provide an electronic device including the switching power supply described in any one of the second aspects.

[0016] The beneficial effects of the embodiments in this application compared with the prior art are:

[0017] This application provides a through-shutdown circuit, including a charge pump module, n through-power modules, and n drive modules. The n drive modules are connected one-to-one with the n through-power modules. The charge pump module is connected to each of the n drive modules. The n through-power modules are all used to connect to the output node in the battery power supply circuit. The n through-power modules are also used to receive input voltage. The charge pump module and the n drive modules are all used to receive a first voltage. Here, n is an integer ≥ 2.

[0018] The charge pump module outputs a second voltage based on a first voltage. When the battery power supply circuit switches from pass-through mode to boost mode, the first drive module receives the second voltage, a first signal, and a first enable signal, and outputs a first shutdown signal based on these signals to control the corresponding first pass-through power module to shut down. The second drive module receives the second voltage, a second signal, and a second enable signal, and outputs a second shutdown signal after a preset time interval based on these signals to control the corresponding second pass-through power module to shut down. Similarly, the nth drive module receives the second voltage, the nth signal, and the nth enable signal, and outputs an nth shutdown signal after an n-1 times preset time interval based on these signals to control the corresponding nth pass-through power module to shut down.

[0019] The pass-through shutdown circuit provided in this application divides the pass-through power transistor into n pass-through power modules, and drives the n pass-through power modules through n drive modules. Compared with the problem of a large drop in output voltage caused by the instantaneous shutdown of the pass-through power transistor in traditional solutions, when the battery power supply circuit switches from pass-through mode to boost mode, the n drive modules control the n pass-through power modules to turn off sequentially at preset time intervals. During the shutdown of the n pass-through power modules, the inductor current rises in a step-like manner, and the boost power transistor can slowly accept the load current, thereby completely absorbing the current turned off by the pass-through power modules; at the same time, it avoids the output voltage from discharging through the load capacitor, thereby reducing the drop in output voltage and ensuring a smooth switch from pass-through mode to boost mode for the battery power supply circuit.

[0020] It is understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a circuit diagram of a battery-powered circuit;

[0023] Figure 2 This is a schematic diagram of a through-shutdown circuit provided in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of a through-shutdown circuit provided in another embodiment of this application;

[0025] Figure 4 This is a circuit connection diagram of a through-shutdown circuit provided in an embodiment of this application;

[0026] Figure 5 This is the shutdown timing diagram when the pass-through mode switches to boost mode in this application;

[0027] Figure 6 This is a simulation diagram of key parameters when switching from through mode to boost mode in this application.

[0028] In the diagram: 10, charge pump module; 20, through power module; 30, drive module; 31, level conversion unit; 32, inverting unit; 33, first switching unit; 34, second switching unit. Detailed Implementation

[0029] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0030] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0031] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0033] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0035] Figure 1 A circuit diagram of a battery-powered circuit is shown. (For example...) Figure 1 As shown, the battery power supply circuit includes a Boost circuit and a Bypass circuit. The Boost circuit includes an upper transistor P1, a lower transistor N1, an inductor L, and a load capacitor CL. The common terminal of the upper transistor P1 and the load capacitor CL is called the output node OUTN. The Bypass circuit includes a through-through power transistor N2. When the input voltage VIN is less than the output voltage VOUT, the circuit operates in Boost mode. When the input voltage VIN is greater than the output voltage VOUT, the circuit automatically switches to Bypass mode. Maintaining a stable output voltage VOUT during the switching process is crucial. However, when the power supply circuit switches from Bypass mode to boost mode, because the through-through power transistor N2 is momentarily turned off and the inductor current cannot change abruptly, the boost power transistor needs some time to reach the load current I. load During this process, the load capacitor CL needs to discharge, so the output voltage VOUT will drop significantly, which has a negative impact on battery power supply.

[0036] To address the aforementioned issues, this application provides a direct-shutdown circuit, comprising a charge pump module, n direct-power modules, and n drive modules. The n drive modules are connected one-to-one with the n direct-power modules, and the charge pump module is connected to each of the n drive modules. Each of the n direct-power modules is used to connect to the output node in the battery power supply circuit, and each of the n direct-power modules is also used to receive an input voltage. The charge pump module and the n drive modules are all used to receive a first voltage; where n is an integer greater than or equal to 2.

[0037] The charge pump module outputs a second voltage based on a first voltage. When the battery power supply circuit switches from pass-through mode to boost mode, the first drive module outputs a first shutdown signal based on the first voltage, the second voltage, a first signal, and a first enable signal, controlling the corresponding first pass-through power module to shut down. The second drive module receives the second voltage, the second signal, and the second enable signal, and outputs a second shutdown signal based on the first voltage, the second voltage, the second signal, and the second enable signal after a preset time interval, controlling the corresponding second pass-through power module to shut down. Similarly, the nth drive module receives the second voltage, the nth signal, and the nth enable signal, and outputs an nth shutdown signal based on the first voltage, the second voltage, the nth signal, and the nth enable signal after an n-1 times preset time interval, controlling the corresponding nth pass-through power module to shut down.

[0038] The pass-through shutdown circuit provided in this application divides the pass-through power transistor into n pass-through power modules, and drives the n pass-through power modules through n drive modules. Compared with the problem of a large drop in output voltage caused by the instantaneous shutdown of the pass-through power transistor in traditional solutions, when the battery power supply circuit switches from pass-through mode to boost mode, the n drive modules control the n pass-through power modules to turn off sequentially at preset time intervals. During the shutdown of the n pass-through power modules, the inductor current rises in a step-like manner, and the boost power transistor can slowly accept the load current, thereby completely absorbing the current turned off by the pass-through power modules; at the same time, it avoids the output voltage from discharging through the load capacitor, thereby reducing the drop in output voltage and ensuring a smooth switch from pass-through mode to boost mode for the battery power supply circuit.

[0039] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0040] Figure 1 A schematic diagram of the through-shutdown circuit provided in an embodiment of this application is shown. Figure 1As shown, the direct-shutdown circuit includes a charge pump module 10, n direct-power modules 20, and n drive modules 30. The n drive modules 30 are connected one-to-one with the n direct-power modules 20. The charge pump module 10 is connected to each of the n drive modules 30. Each of the n direct-power modules 20 is connected to the output node OUTN in the battery power supply circuit and also receives the input voltage VIN. Both the charge pump module 10 and the n drive modules 30 receive the first voltage VDD. Here, n is an integer greater than or equal to 2. It should be noted that a larger value for n is not always better; as n increases, the complexity of the circuit also increases. Therefore, in practical applications, the value of n can be set according to actual needs. In this embodiment, the first voltage VDD is the low-voltage domain supply voltage.

[0041] Specifically, the charge pump module 10 is used to output a second voltage VDD_H based on the first voltage VDD. In this embodiment, the second voltage VDD_H is the high-voltage domain supply voltage, generated by the charge pump module 10 by doubling the voltage of the first voltage VDD, and its voltage value is twice that of the first voltage VDD. When the battery power supply circuit switches from the pass-through mode to the boost mode, the first drive module 30 is used to receive the second voltage VDD_H, the first signal VS1, and the first enable signal EN1, and outputs a first shutdown signal Gate1 based on the first voltage VDD, the second voltage VDD_H, the first signal VS1, and the first enable signal EN1, controlling the corresponding first pass-through power module 20 to shut down. The second drive module 30 is used to receive the second voltage VDD_H, the second signal VS2, and the second enable signal EN2, and outputs a second shutdown signal Gate2 after a preset time interval based on the first voltage VDD, the second voltage VDD_H, the second signal VS2, and the second enable signal EN2, controlling the corresponding second pass-through power module 20 to shut down. In this embodiment, the preset time interval is 10µs. Similarly, the nth drive module 30 receives the second voltage VDD_H, the nth signal VSn, and the nth enable signal ENn, and outputs the nth shutdown signal Gaten after an interval of n-1 times the preset time interval based on the first voltage VDD, the second voltage VDD_H, the nth signal VSn, and the nth enable signal ENn, thereby controlling the corresponding nth through-power module 20 to shut down. In this embodiment, the first shutdown signal Gate1, the second shutdown signal Gate2, ..., the nth shutdown signal Gaten are all low-level signals.

[0042] It should be noted that when the battery power supply circuit switches from pass-through mode to boost mode, the first enable signal EN1 changes from high to low, the second enable signal EN2 changes from high to low after a preset time interval, and so on, with the nth enable signal ENn changing from high to low after n-1 times the preset time interval. It is important to note that when the ath enable signal ENa changes from high to low, the ath signal VSa should remain high to prevent interference with the normal operation of other drive modules 30. Where 1 ≤ a ≤ n.

[0043] The direct-on shutdown circuit provided in this application divides the direct-on power transistor N2 into n direct-on power modules 20, and drives the n direct-on power modules 20 through n drive modules 30. Compared with the problem of a large drop in output voltage VOUT caused by the instantaneous turn-off of the direct-on power transistor N2 in the traditional solution, when the battery power supply circuit switches from direct-on mode to boost mode, the n drive modules 30 control the n direct-on power modules 20 to turn off sequentially at preset time intervals. During the process of turning off the n direct-on power modules 20, the inductor current rises in a step-like manner, and the boost power transistor can slowly accept the load current I. load This completely absorbs the current from the shutdown of the power module 20; at the same time, it prevents the output voltage VOUT from discharging through the load capacitor CL, thereby reducing the drop in output voltage VOUT and ensuring a smooth switch from the battery power supply circuit to the boost mode.

[0044] In one embodiment of this application, when the battery power supply circuit switches from boost mode to direct-through mode, the first driving module 30 is further configured to output a first turn-on signal based on the first voltage VDD, the second voltage VDD_H, the first signal VS1, and the first enable signal EN1. The second driving module 30 is further configured to output a second turn-on signal based on the first voltage VDD, the second voltage VDD_H, the second signal VS2, and the second enable signal EN2. Similarly, the nth driving module 30 is further configured to output an nth turn-on signal based on the first voltage VDD, the second voltage VDD_H, the nth signal VSn, and the nth enable signal ENn. The first turn-on signal, the second turn-on signal, ..., the nth turn-on signal are used to control the corresponding first direct-through power module 20, the corresponding second direct-through power module 20, ..., the corresponding nth direct-through power module 20 to be simultaneously turned on. It should be noted that the first turn-on signal, the second turn-on signal, ..., the nth turn-on signal are all high-level signals.

[0045] In summary, when the battery power supply circuit switches from boost mode to direct mode, n drive modules 30 control n direct power modules 20 to be turned on simultaneously, so as to realize the switching from boost mode to direct mode.

[0046] In one embodiment of this application, such as Figure 3As shown, the a-th drive module 30 includes an a-th level conversion unit 31, an a-th inverting unit 32, an a-th first switching unit 33, and an a-th second switching unit 34. The a-th first switching unit 33 is connected to the a-th inverting unit 32, the a-th second switching unit 34, and the a-th direct-through power module 20, respectively. The a-th second switching unit 34 and the a-th level conversion unit 31 are both connected to the charge pump module 10. The a-th level conversion unit 31 is connected to the a-th second switching unit 34.

[0047] Specifically, when the battery power supply circuit switches from direct-through mode to boost mode, the a-th inverting unit 32 receives the a-th enable signal ENa, inverts the a-th enable signal ENa, and outputs the a-th inverted signal. The a-th first switching unit 33 is turned on according to the a-th inverted signal after a-1 times the preset time interval, and outputs the a-th turn-off signal Gatea to control the turn-off of the corresponding a-th direct-through power module 20. That is, the a-th enable signal ENa changes from high level to low level after a-1 times the preset time interval, thereby causing the a-th inverted signal to change from low level to high level after a-1 times the preset time interval, so as to control the a-th first switching unit 33 to turn on. The a-th level conversion unit 31 is used to receive the first voltage VDD, the second voltage VDD_H, and the a-th signal VSa, and output the a-th level signal Va according to the a-th signal VSa. The a-th level signal Va is either the first voltage VDD or the second voltage VDD_H. When the a-th direct-through power module 20 is turned off, the a-th level signal Va is the second voltage VDD_H to control the a-th second switching unit 34 to turn off. Where 1 ≤ a ≤ n.

[0048] It should be noted that the first voltage VDD is the low-voltage domain supply voltage of the a-th level conversion unit 31, the second voltage VDD_H is the high-voltage domain supply voltage of the a-th level conversion unit 31, and the a-th signal VSa is the input signal of the a-th level conversion unit 31. When the a-th signal VSa is low, the a-th level signal Va output by the a-th level conversion unit 31 is the first voltage VDD; when the a-th signal VSa is high, the a-th level signal Va output by the a-th level conversion unit 31 is the second voltage VDD_H. It is important to note that when the a-th through power module 20 is turned off, the a-th signal VSa should be kept high, thereby ensuring that the a-th level signal Va output by the a-th level conversion unit 31 is the second voltage VDD_H, thus controlling the a-th second switch unit 34 to turn off. That is, when the a-th enable signal ENa changes from high to low, the a-th signal VSa should remain high to prevent affecting the normal operation of other drive modules 30.

[0049] In one embodiment of this application, such as Figure 4As shown, the a-th inverter unit 32 includes an a-th inverter INVa. The input terminal of the a-th inverter INVa is used to receive the a-th enable signal ENa. The output terminal of the a-th inverter INVa is connected to the a-th first switch unit 33.

[0050] Specifically, the a-th inverter INVa is used to invert the a-th enable signal ENa and output the a-th inverted signal.

[0051] In one embodiment of this application, such as Figure 4 As shown, the a-th first switching unit 33 includes an a-th first transistor M1a. The gate of the a-th first transistor M1a is connected to the a-th inverting unit 32, the source of the a-th first transistor M1a is grounded, and the drain of the a-th first transistor M1a is connected to the a-th second switching unit 34 and the a-th through power module 20, respectively. In this embodiment, the a-th first transistor M1a is an NMOS transistor.

[0052] Specifically, when the battery power supply circuit switches from direct mode to boost mode, the a-th inverter INVa is used to invert the a-th enable signal ENA and output the a-th inverted signal. The a-th first transistor M1a is used to turn on according to the a-th inverted signal after a-1 times the preset time interval and output the a-th turn-off signal Gatea to control the turn-off of the corresponding a-th direct power module 20.

[0053] In one embodiment of this application, such as Figure 4 As shown, the a-th second switching unit 34 includes a-th second transistor M2a. The gate of the a-th second transistor M2a is connected to the a-th level conversion unit 31, the drain of the a-th second transistor M2a is connected to the a-th first switching unit 33 and the a-th through power module 20, and the source of the a-th second transistor M2a is connected to the a-th level conversion unit 31 and the charge pump module 10. In this embodiment, the a-th second transistor M2a is a PMOS transistor.

[0054] Specifically, when the a-th through power module 20 is turned off, the a-th level signal Va output by the a-th level conversion unit 31 is the second voltage VDD_H, which controls the a-th second transistor M2a to turn off, so as not to affect the second voltage VDD_H at its drain, thus ensuring the normal operation of other drive modules 30.

[0055] In one embodiment of this application, such as Figure 4As shown, the a-th direct-through power module 20 includes an a-th third transistor M3a. The gate of the a-th third transistor M3a is connected to the a-th driving module 30. The source of the a-th third transistor M3a is used to receive the input voltage VIN, and the drain of the a-th third transistor M3a is used to connect to the output node OUTN of the battery power supply circuit; where 1≤a≤n. In this embodiment, the a-th third transistor M3a is an NMOS transistor.

[0056] Specifically, in this application, the through-through power transistor N2 is divided into n third transistors M31, M32, ..., M3n. The total area of ​​the n third transistors M31, M32, ..., M3n is equal to the area of ​​the through-through power transistor N2. The area ratio among the n third transistors M31, M32, ..., M3n can be equal or divided according to other ratios.

[0057] When the battery power supply circuit switches from direct-through mode to boost mode, the a-th inverter INVa inverts the a-th enable signal ENA and outputs the a-th inverted signal. The a-th first transistor M1a turns on according to the a-th inverted signal after a-1 times the preset time interval and outputs the a-th turn-off signal Gatea, controlling the turn-off of the corresponding a-th third transistor M3a.

[0058] This application uses n driving modules 30 to control n third transistors M31, M32, ..., M3n to turn off sequentially at preset time intervals. During the process of turning off the n third transistors M31, M32, ..., M3n, the inductor current increases in a step-like manner, and the boost power transistor can slowly accept the load current I. load This completely absorbs the current from the turn-off of the n third transistors M31, M32, ..., M3n; at the same time, it prevents the output voltage VOUT from discharging through the load capacitor CL, thereby reducing the drop in output voltage VOUT and ensuring a smooth switch from the battery power supply circuit to the boost mode. Specific Implementation

[0060] This application divides the through-through power transistor N2 into six third transistors M31, M32, ..., M36, which are driven by six driver modules 30. When the battery power supply circuit switches from through-through mode to boost mode, the six driver modules 30 control the six third transistors M31, M32, ..., M36 to turn off sequentially at 10µs intervals. First, the first enable signal EN1 goes low, is inverted by the first inverter INVa, and outputs a first inverted signal to control the first transistor M11 to turn on and output the first turn-off signal Gate1, ultimately controlling the first third transistor M31 to turn off. At this time, it is necessary to ensure that the first level signal V1 output by the first level conversion unit 31 is the second voltage VDD_H to avoid affecting the operation of other driver modules 30. When the first enable signal EN1 goes low, the second enable signals EN2 to the sixth enable signals EN6 remain high temporarily, allowing the second third transistor M32 to the sixth third transistor M36 to conduct and operate normally, thus enabling the boost power transistor to slowly flow current. Figure 5 The turn-off timing diagram of six third transistors M31, M32, ..., M36 is shown. After the first enable signal EN1 goes low for 10us, the second enable signal EN2 goes low, turning off the second third transistor M32; after the second enable signal EN2 goes low for 10us, the third enable signal EN3 goes low, turning off the third third transistor M33; and so on, until the sixth third transistor M36 is turned off. Figure 6 The simulation diagram shows the key parameters when switching from through mode to boost mode, where I L I is the inductor current. IN This is the current across the input voltage VIN. Figure 6 From this, we can deduce that during the process of turning off the six third transistors M31, M32, ..., M36, the inductor current I... L The voltage rises in a step-like manner, allowing the boost power transistor to gradually accept the load current I. load This completely absorbs the current from the shutdown of the six third transistors M31, M32, ..., M36; at the same time, it prevents the output voltage VOUT from discharging through the load capacitor CL, thereby reducing the drop in output voltage VOUT and ensuring a smooth switch from the battery power supply circuit to the boost mode.

[0061] This application also provides a switching power supply, including the aforementioned shoot-through shutdown circuit. Since the switching power supply provided in this application adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated upon further here.

[0062] This application also provides an electronic device, including the switching power supply described above. Since the electronic device provided in this application adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0064] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A direct-shutdown circuit applied to a battery-powered circuit, the battery-powered circuit including a Boost circuit, the Boost circuit including an upper transistor, a lower transistor, an inductor, and a load capacitor, wherein the source of the upper transistor is connected to the drain of the lower transistor and a first terminal of the inductor, the second terminal of the inductor is connected to the positive terminal of the input power supply, the drain of the upper transistor is connected to the first terminal of the load capacitor, and the source of the lower transistor and the second terminal of the load capacitor are both connected to the negative terminal of the input power supply, wherein... The common terminal of the upper transistor and the load capacitor is called the output node; characterized in that it includes a charge pump module, n through power modules and n drive modules, the n drive modules are connected one-to-one with the n through power modules, the charge pump module is connected to each of the n drive modules, the n through power modules are all used to connect to the output node in the battery power supply circuit, the n through power modules are also used to receive input voltage, and the charge pump module and the n drive modules are all used to receive a first voltage; where n is an integer greater than or equal to 2; The charge pump module is used to output a second voltage according to the first voltage; when the battery power supply circuit switches from through mode to boost mode, the first drive module is used to receive the second voltage, the first signal and the first enable signal, and output a first shutdown signal according to the first voltage, the second voltage, the first signal and the first enable signal to control the corresponding first through power module to shut down; the second drive module is used to receive the second voltage, the second signal and the second enable signal, and output a second shutdown signal according to the first voltage, the second voltage, the second signal and the second enable signal after a preset time interval to control the corresponding second through power module to shut down; and so on, the nth drive module is used to receive the second voltage, the nth signal and the nth enable signal, and output an nth shutdown signal according to the first voltage, the second voltage, the nth signal and the nth enable signal after n-1 times the preset time interval to control the corresponding nth through power module to shut down.

2. The direct-on shutdown circuit according to claim 1, characterized in that, When the battery power supply circuit switches from boost mode to direct-through mode, the first drive module is further configured to output a first turn-on signal based on the first voltage, the second voltage, the first signal, and the first enable signal; the second drive module is further configured to output a second turn-on signal based on the first voltage, the second voltage, the second signal, and the second enable signal; and so on, the nth drive module is further configured to output an nth turn-on signal based on the first voltage, the second voltage, the nth signal, and the nth enable signal; the first turn-on signal, the second turn-on signal, ..., the nth turn-on signal are used to control the corresponding first direct-through power module, the corresponding second direct-through power module, ..., the corresponding nth direct-through power module to be turned on simultaneously.

3. The direct-shutdown circuit according to claim 1 or 2, characterized in that, The a-th drive module includes an a-th level conversion unit, an a-th inverting unit, an a-th first switching unit, and an a-th second switching unit. The a-th first switching unit is connected to the a-th inverting unit, the a-th second switching unit, and the a-th through power module. The a-th second switching unit and the a-th level conversion unit are both connected to the charge pump module. The a-th level conversion unit is connected to the a-th second switching unit. When the battery power supply circuit switches from through mode to boost mode, the a-th inverting unit is used to receive the a-th enable signal, invert the a-th enable signal, and output the a-th inverted signal; the a-th first switching unit is used to turn on according to the a-th inverted signal after a-1 times the preset time interval, and output the a-th turn-off signal to control the turn-off of the corresponding a-th through power module. The a-th level conversion unit is used to receive a first voltage, a second voltage, and an a-th signal, and output an a-th level signal according to the a-th signal, wherein the a-th level signal is either the first voltage or the second voltage; when the a-th direct power module 20 is turned off, the a-th level signal is the second voltage to control the a-th second switch unit to turn off; wherein 1≤a≤n.

4. The direct-on shutdown circuit according to claim 3, characterized in that, The a-th inverter unit includes an a-th inverter, the input terminal of which is used to receive the a-th enable signal, and the output terminal of which is connected to the a-th first switch unit.

5. The direct-on shutdown circuit according to claim 3, characterized in that, The a-th first switching unit includes an a-th first transistor, the gate of which is connected to the a-th inverting unit, the source of which is grounded, and the drain of which is connected to the a-th second switching unit and the a-th through power module.

6. The direct-shutdown circuit according to claim 4, characterized in that, The a-th second switching unit includes an a-th second transistor, the gate of which is connected to the a-th level conversion unit, the drain of which is connected to the a-th first switching unit and the a-th through power module, and the source of which is connected to the a-th level conversion unit and the charge pump module.

7. The direct-on shutdown circuit according to claim 6, characterized in that, The first transistor of type a is an NMOS transistor, and the second transistor of type a is a PMOS transistor.

8. The direct-shutdown circuit according to claim 1 or 2, characterized in that, The a-th through power module includes an a-th third transistor, the gate of which is connected to the a-th driving module, the source of which is used to receive the input voltage, and the drain of which is used to connect to the output node of the battery power supply circuit; where 1≤a≤n.

9. A switching power supply, characterized in that, Includes the through-shutdown circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, Includes the switching power supply as described in claim 9.

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