Multi-path switching power supply and electronic device

Abstract

The embodiment of the application provides a kind of multi-path switching power supply and electronic equipment, the multi-path switching power supply includes controller and multiple switching circuits, each switching circuit is connected with controller respectively and each switching circuit is adjacently arranged, wherein controller is used to control the current loop of at least two switching circuits respectively keeps opposite.It can be understood that, when multi-path switching power supply works, there are at least two or more switching circuits working simultaneously, and the current loop of at least two switching circuits is opposite, according to Ampere rule, the magnetic field direction generated by current loop is opposite, i.e. the magnetic field direction generated by at least two switching circuits is opposite, and since each switching circuit is adjacently arranged, the magnetic field generated by at least two switching circuits can weaken each other even cancel out, i.e. the magnetic field generated by multi-path switching power supply is weakened, so the electromagnetic interference generated by multi-path switching power supply is improved.

Description

Technical Field

[0001] This invention relates to the field of switching power supply technology, and in particular to a multi-channel switching power supply and electronic device. Background Technology

[0002] A switch-mode power supply (SMPS) is a high-frequency power conversion device, a type of power supply. Its function is to convert a voltage at a certain level into the voltage or current required by the user through different architectures. Currently, switch-mode power supplies are widely used in various industries, such as the computer industry and the mobile phone industry.

[0003] However, when a switching power supply is working, it will generate electromagnetic interference (EMI). If there are sensitive devices near the switching power supply, the generated electromagnetic interference will affect the sensitive devices, reduce their performance, or even cause them to malfunction. Summary of the Invention

[0004] Based on this, this application provides a multi-channel switching power supply and electronic device to improve the electromagnetic interference generated by the switching power supply.

[0005] In a first aspect, this application provides a multi-channel switching power supply, including a controller and a plurality of switching circuits, each of the switching circuits being connected to the controller and arranged adjacent to each other; the controller is used to control at least two switching circuits to keep their respective current loops opposite.

[0006] Secondly, this application provides an electronic device, including a power supply circuit, a multi-channel switching power supply as described in the first aspect, and a load device.

[0007] This application provides a multi-channel switching power supply and electronic device. The multi-channel switching power supply includes a controller and multiple switching circuits. Each switching circuit is connected to the controller and arranged adjacent to each other. The controller is used to control at least two switching circuits to keep their respective current loops opposite. It is understood that when the multi-channel switching power supply is operating, at least two or more switching circuits operate simultaneously, and the current loops of at least two switching circuits are opposite. According to Ampere's law, opposite current loops result in opposite magnetic field directions. That is, at least two switching circuits generate magnetic fields in opposite directions. Furthermore, since the switching circuits are arranged adjacent to each other, the magnetic fields generated by at least two switching circuits can weaken or even cancel each other out, thus weakening the magnetic field generated by the multi-channel switching power supply and improving the electromagnetic interference generated by the multi-channel switching power supply. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a circuit structure of an electronic device provided in an embodiment of this application;

[0009] Figure 2 This is a schematic diagram of a circuit structure of a multi-channel switching power supply provided in an embodiment of this application;

[0010] Figure 3 This is a schematic diagram of an optional circuit structure of a multi-channel switching power supply in one embodiment of this application;

[0011] Figure 4 This is a schematic diagram of another optional circuit structure for a multi-channel switching power supply in one embodiment of this application;

[0012] Figure 5 This is an optional arrangement and wiring method for the first component in one embodiment of this application;

[0013] Figure 6 This is another optional arrangement and wiring method for the first component in one embodiment of this application;

[0014] Figure 7 This is a schematic diagram of an optional circuit structure for a switching circuit in one embodiment of this application;

[0015] Figure 8 This is a schematic diagram of another optional circuit structure of the switching circuit in one embodiment of this application;

[0016] Figure 9 This is a schematic diagram of an optional application scenario according to an embodiment of this application. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0019] Electromagnetic interference is generated during the operation of switching power supplies. To address this issue, one related technique involves adjusting certain components, such as inductors, capacitors, and resistors. For example, replacing a 10mH inductor with a 20mH inductor. Another technique involves adjusting the operating parameters of the switching transistor, such as adjusting its on / off frequency. Both methods alter the original operating mode of the switching power supply, preventing it from operating at its optimal level and leading to increased power consumption.

[0020] Based on this, an electronic device is provided in the embodiments of this application, such as... Figure 1 As shown, it includes: a power supply circuit 10, a multi-channel switching power supply 20, and a load device 30, wherein the power supply circuit 10 is connected to the multi-channel switching power supply 20, and the multi-channel switching power supply 20 is connected to the load device 30.

[0021] In some embodiments, the multi-channel switching power supply 20 can be connected to one or more power circuits 10, and the multi-channel switching power supply 20 can also be connected to one or more load devices 30. The number of power circuits 10 and load devices 30 can be reasonably set according to actual needs. In some embodiments, the power circuit 10 may include a DC power supply and / or an AC power supply. For example, the power circuit 10 may include a lithium battery, etc., or it may include an AC mains power supply, etc. In some embodiments, the multi-channel switching power supply 20 is used to process the DC power supply and / or AC power supply output from the power circuit 10 into DC power supply and supply power to the load device 30, wherein the load device 30 may include an antenna or other sensitive device.

[0022] This application provides a multi-channel switching power supply 20, such as... Figure 2 As shown, it includes: a controller 201 and a plurality of switch circuits 202, wherein each switch circuit 202 is connected to the controller 201, and each switch circuit 202 is arranged adjacent to each other.

[0023] In some embodiments, the switching circuit 202 may include a DC-DC converter or an AC-DC converter. For example, the switching circuit 202 may include a buck circuit, a boost circuit, or a buck-boost circuit. It should be noted that... Figure 2 The diagram only illustrates three switching circuits 202, and... Figure 2 This is merely an example of three switch circuits 202 arranged adjacently on the same horizontal plane, and the actual way they are arranged adjacently is not limited to this.

[0024] The controller 201 is used to control the current loops of at least two switching circuits 202 to remain opposite. In some embodiments, the controller 201 can control the operating mode of the switching circuits 202, for example, the controller 201 can control the operating mode of the switching circuits 202 through PWM (Pulse Width Modulation).

[0025] When the switching circuit 202 is operating, it generates a magnetic field that can cause external interference, i.e., electromagnetic interference. Furthermore, the intensity of this interference is directly proportional to the strength of the magnetic field. In this embodiment, when the multi-channel switching power supply 20 is operating, at least two switching circuits 202 operate simultaneously, and the current loops of each of the at least two switching circuits 202 are opposite. According to Ampere's law, opposite current loops result in opposite magnetic field directions. Since the switching circuits 202 are arranged adjacent to each other, the magnetic fields generated by each of the at least two switching circuits 202 can weaken or even cancel each other out, thus reducing the magnetic field generated by the multi-channel switching power supply 20 and improving the electromagnetic interference generated by the multi-channel switching power supply 20. Compared with related technologies, this embodiment does not require adjustment of the components in the switching power supply or the operating parameters of the switching transistors, improving the electromagnetic interference generated by the switching power supply while enabling it to operate in an optimal mode.

[0026] For example, such as Figure 3 As shown, two switching circuits 202 are respectively connected to controller 201, and the two switching circuits 202 are arranged adjacent to each other. Based on this, when the multi-channel switching power supply 20 is working, controller 201 controls the current loops of the two switching circuits 202 to remain opposite, for example, as Figure 3 As shown, the current loop of the upper switching circuit 202 is counterclockwise, and the current loop of the lower switching circuit 202 is clockwise. Therefore, the magnetic fields generated by these two current loops weaken or even cancel each other, thereby improving the electromagnetic interference generated when the multi-channel switching power supply 20 is working.

[0027] For example, such as Figure 4 As shown, three switching circuits 202 are respectively connected to the controller 201, and the three switching circuits 202 are arranged adjacent to each other. Based on this, when the multi-channel switching power supply 20 is working, the controller 201 controls the current loops of the three switching circuits 202 to remain opposite, for example, as Figure 4As shown, the current loops of the upper and lower switching circuits 202 are counterclockwise, while the current loop of the middle switching circuit 202 is clockwise. Therefore, the magnetic fields generated by these three current loops weaken or even cancel each other out, thereby improving the electromagnetic interference generated when the multi-channel switching power supply 20 is working.

[0028] In some embodiments, the switching circuit 202 may include a first switching transistor and a second switching transistor, wherein at least one switching transistor in the switching circuit 202 is connected to the controller 201, that is, the first switching transistor and / or the second switching transistor are connected to the controller. For example, the first switching transistor is connected to the controller 201 but not to the controller 201; or, for example, both the first and second switching transistors are connected to the controller 201. Furthermore, since the switching circuit 202 has voltage processing capabilities, only one switching transistor in the controller 201 is in a conducting state at any given time. That is, when the first switching transistor is on, the second switching transistor is off, and when the first switching transistor is off, the second switching transistor is on. For example, when the switching circuit 202 is in an operating state, when the first switching transistor is on, the second switching transistor is off, and after a certain period of time, the first switching transistor is off and the second switching transistor is on. The switching transistor may include, but is not limited to, transistors, diodes, etc. In some embodiments, the first and second switching transistors may be integrally packaged within a switching chip; for example, the first and second switching transistors of all switching circuits 202 may be integrally packaged within a single switching chip.

[0029] To effectively mitigate the electromagnetic interference generated by the multi-channel switching power supply 20, the current loop of the switching circuit 202 needs to have a certain directionality. Therefore, on the one hand, the current loop formed between the first components in the switching circuit 202 when the first switch is turned on is in the first direction; on the other hand, the current loop formed between the second components in the switching circuit 202 when the second switch is turned on is in the second direction. The first and second directions include clockwise or counterclockwise directions.

[0030] Specifically, the switching circuit 202 includes other components besides the first and second switching transistors, such as capacitors and inductors. When the first switching transistor is turned on, the first component operates while the second component does not. According to the operating principle of the switching circuit 202, the current flow sequence within it is fixed; for example, the current flows through component A first, then through component B. Therefore, the first components can be arranged and wired in a specific way to ensure that the current loop formed between them is in the first direction. Whether the first direction is clockwise or counterclockwise depends on the arrangement and wiring of the first components. Similarly, the situation is similar when the second switching transistor is turned on, and will not be elaborated further here.

[0031] For example, such as Figure 5 As shown, when the first switch is turned on, components 1 and 2 operate in conjunction with the first switch. That is, the first component includes components 1 and 2, and the first switch. Furthermore, the current flow sequence is: input terminal -> component 1 -> first switch -> component 2 -> output terminal. The layout and wiring of the first component are shown in the figure. Therefore, it can be understood that the current loop of the switching circuit 202 is counterclockwise at this time, i.e., the first direction is counterclockwise. For example, as... Figure 6 As shown, assuming Figure 6 The first component and the current flow sequence are both related to Figure 5 Similarly, the layout and wiring of the first component are shown in the figure. In this case, the current loop of the switching circuit 202 is clockwise, that is, the first direction is clockwise. It should also be noted that the layout and wiring of the first component are not limited to this.

[0032] In some embodiments, the switching circuit 202 further includes an input terminal, an output terminal, an inductor, a first capacitor, and a second capacitor. The inductor and the first switching transistor are connected between the input terminal and the output terminal. The inductor is also connected between the second switching transistor and the first capacitor. The second capacitor is connected to either the input terminal or the output terminal.

[0033] The input terminal can be used to connect to the power supply circuit 10, and the output terminal can be used to connect to the load device 30. It should be noted that the input terminals of different switching circuits 202 can be connected to the same power supply circuit 10 or to different power supply circuits 10. Similarly, the output terminals of different switching circuits 202 can be connected to the same load device 30 or to different load devices 30.

[0034] For example, such as Figure 7As shown, the switching circuit 202 may include a DC-DC converter circuit (Buck circuit). The input terminal is connected to the power supply circuit 10, and the output terminal is connected to the load device 30. An inductor L and a first switching transistor Q1 are connected between the input and output terminals. The inductor L is also connected between a second switching transistor Q2 and a first capacitor C1, with the second capacitor C2 connected to the input terminal. The first switching transistor Q1 is a transistor, and the second switching transistor Q2 is a diode. Furthermore, the first switching transistor Q1 can be connected to a controller 201 and turned on or off under the control of the controller 201. Similarly, the second switching transistor Q2 can also be a transistor connected to the controller 201 and turned on or off under the control of the controller 201. Based on this, and considering the working principle of the Buck circuit, when the first switching transistor Q1 is on, the components in operation are the second capacitor C2, the first switching transistor Q1, and the inductor L. The current flow sequence is: input terminal -> second capacitor C2 -> first switching transistor Q1 -> inductor L -> output terminal. Therefore, according to... Figure 7 From the arrangement and wiring of these components, it can be seen that the current loop of the switching circuit 202 is counterclockwise, that is, the first direction is counterclockwise. When the second switch Q2 is turned on, the components in the working state are inductor L, first capacitor C1 and second switch Q2, and the current flow sequence is: inductor L -> first capacitor C1 -> second switch Q2 -> inductor L. Therefore, according to... Figure 7 From the layout and wiring of these three components, it can be seen that the current loop of the switching circuit 202 is clockwise, that is, the second direction is clockwise.

[0035] For example, such as Figure 8 As shown, the switching circuit 202 may include a DC-DC converter boost circuit. The input terminal is connected to the power supply circuit 10, and the output terminal is connected to the load device 30. An inductor L and a first switching transistor Q1 are connected between the input and output terminals. The inductor L is also connected between a second switching transistor Q2 and a first capacitor C1. The second capacitor C2 is connected to the output terminal. The first switching transistor Q1 includes a diode, and the second switching transistor Q2 includes a transistor. Furthermore, the second switching transistor Q2 can be connected to the controller 201 and turned on or off under the control of the controller 201. Alternatively, the first switching transistor Q1 can also include a transistor and be connected to the controller 201 and turned on or off under the control of the controller 201. Based on this, and considering the working principle of the boost circuit, when the first switching transistor Q1 is turned on, according to... Figure 8 From the arrangement and wiring of the inductor L, the first switch Q1, and the second capacitor C2, it can be seen that the current loop of the switching circuit 202 is counterclockwise, that is, the first direction is counterclockwise; when the second switch Q2 is turned on, according to Figure 8The arrangement and wiring of the inductor L, the second switch Q2, and the first capacitor C1 indicate that the current loop of the switching circuit 202 is clockwise, i.e., the second direction is clockwise. It should be noted that those skilled in the art are familiar with the working principle of boost circuits; therefore, further reasoning and analysis are not required here.

[0036] In some embodiments, the above-mentioned at least two switching circuits 202 include a first switching circuit and a second switching circuit, wherein the first switching circuit and the second switching circuit can be one or more, and the embodiments of this application are not limited thereto.

[0037] As described above, when the first switching transistor is turned on, the current loop of the switching circuit 202 is in the first direction, and when the second switching transistor is turned on, the current loop is in the second direction. Furthermore, at least one switching transistor in the switching circuit 202 is connected to the controller 201 and is turned on or off under the control of the controller 201. Therefore, the controller 201 can control the switching transistors to turn on or off, keeping the circuit loops of the first and second switching circuits in opposite directions. Based on this, if the first and second directions of the first and second switching circuits are opposite, the controller 201 can control the first switching transistor of the first switching circuit and the first switching transistor of the second switching circuit to turn on or off synchronously, i.e., turn on or off together, and / or control the second switching transistor of the first and second switching circuits to turn on or off synchronously. This ensures that the current loops of the first and second switching circuits remain opposite, thereby improving the electromagnetic interference caused by the multi-channel switching power supply 20. Furthermore, if the first switching circuit and the second switching circuit have the same first direction and the same second direction, that is, the first direction of the first switching circuit is opposite to the second direction of the second switching circuit, and the second direction of the first switching circuit is opposite to the first direction of the second switching circuit, then the controller 201 can control the first switching transistor of the first switching circuit and the second switching transistor of the second switching circuit to be turned on or off synchronously, and / or control the second switching transistor of the first switching circuit and the first switching transistor of the second switching circuit to be turned on or off synchronously. This can also ensure that the current loops of the first switching circuit and the second switching circuit remain opposite, thereby improving the electromagnetic interference caused by the multi-channel switching power supply 20.

[0038] In some embodiments, the difference in current values ​​between the current loops of at least two switching circuits is less than a preset threshold. According to Ampere's law, the magnetic field generated by a current loop is directly proportional to the magnitude of the current in the current loop. Therefore, when the difference in current values ​​between the current loops of at least two switching circuits is less than the preset threshold, the electromagnetic interference generated by the multi-channel switching power supply 20 can be more effectively reduced. It should be noted that the preset threshold can be reasonably set according to actual conditions, and the method for obtaining the current magnitude of the current loop is not limited in this embodiment.

[0039] In some embodiments, the multi-channel switching power supply 20 may further include a voltage divider circuit connected to each switching circuit. The voltage divider circuit may be one or more; for example, there may be one voltage divider circuit, with each switching circuit connected to it. Alternatively, the number of voltage divider circuits may be the same as the number of switching circuits, with one voltage divider circuit connected to one switching circuit. In some embodiments, the voltage divider circuit may include a voltage divider resistor, and the specific resistance value of the voltage divider resistor can be reasonably set according to actual conditions.

[0040] In some embodiments, the multi-channel switching power supply 20 may further include a voltage regulator circuit connected to each switching circuit. The voltage regulator circuit may be one or more, for example, there may be one voltage regulator circuit, and each switching circuit may be connected to the voltage regulator circuit; or, for example, the number of voltage regulator circuits may be the same as the number of switching circuits, with one voltage regulator circuit connected to one switching circuit.

[0041] Based on the above discussion, the embodiments of this application can be applied to, for example... Figure 9 The multi-channel switching power supply shown includes two switching circuits, namely switching circuit 1 and switching circuit 2. Switching circuit 1 includes a first switching transistor Q1 and a second switching transistor Q2, and switching circuit 2 includes a first switching transistor Q3 and a second switching transistor Q4. These four switching transistors are integrated into a switching chip. In addition, both switching circuit 1 and switching circuit 2 can include a buck circuit. The other components and connections of switching circuit 1 and switching circuit 2 are shown in the figure and will not be described in detail here. Based on this, combined with the working principle of the buck circuit and the component layout and wiring method in the diagram, it can be seen that when switch Q1 is on, the current loop I1 of switch circuit 1 is counterclockwise; when switch Q2 is on, the current loop I2 of switch circuit 1 is clockwise; when switch Q3 is on, the current loop I3 of switch circuit 2 is clockwise; and when switch Q4 is on, the current loop I4 of switch circuit 2 is counterclockwise. Therefore, current loops I1 and I3 are opposite, and current loops I2 and I4 are opposite. Based on this, the controller (not shown in the diagram) can control switch Q1 and switch Q3 to be turned on or off synchronously, and / or control switch Q2 and switch Q4 to be turned on or off synchronously. This ensures that the current loops of switch circuit 1 and switch circuit 2 remain opposite, thereby improving the electromagnetic interference generated by the multi-channel switching power supply.

[0042] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-channel switching power supply, characterized in that, It includes a controller and multiple switching circuits, each of which is connected to the controller and is arranged adjacent to each other. The controller is used to: control the current loops of at least two switching circuits to remain opposite; The switching circuit includes a first switching transistor and a second switching transistor; the first switching transistor and / or the second switching transistor are connected to the controller, and the controller controls only one of the first switching transistor and the second switching transistor of the switching circuit to be turned on at any given time; when the first switching transistor is turned on, the current loop formed between the first components in the switching circuit that are in operation is in a first direction; when the second switching transistor is turned on, the current loop formed between the second components in the switching circuit that are in operation is in a second direction; wherein the first direction and the second direction include clockwise or counterclockwise directions, and the first direction and the second direction are opposite; The switching circuit further includes an input terminal, an output terminal, an inductor, a first capacitor, and a second capacitor; the inductor and the first switching transistor are connected between the input terminal and the output terminal, the inductor is also connected between the second switching transistor and the first capacitor, and the second capacitor is connected to either the input terminal or the output terminal.

2. The multi-channel switching power supply according to claim 1, characterized in that, The at least two switching circuits include a first switching circuit and a second switching circuit; If the first switching circuit and the second switching circuit have opposite first and second directions, the controller controls the first switching transistor of the first switching circuit and the first switching transistor of the second switching circuit to be synchronously turned on or off, and / or controls the second switching transistor of the first switching circuit and the second switching transistor of the second switching circuit to be synchronously turned on or off; or... If the first switching circuit and the second switching circuit have the same first direction and the same second direction, then the controller controls the first switching transistor of the first switching circuit and the second switching transistor of the second switching circuit to be turned on or off synchronously, and / or controls the second switching transistor of the first switching circuit and the first switching transistor of the second switching circuit to be turned on or off synchronously.

3. The multi-channel switching power supply according to claim 1, characterized in that, The first switching transistor and the second switching transistor are integrally packaged within a switching chip.

4. The multi-channel switching power supply according to any one of claims 1-3, characterized in that, The difference in current values ​​between the current loops of the at least two switching circuits is less than a preset threshold.

5. The multi-channel switching power supply according to any one of claims 1-3, characterized in that, The multi-channel switching power supply also includes a voltage divider circuit, which is connected to each of the switching circuits.

6. The multi-channel switching power supply according to any one of claims 1-3, characterized in that, The multi-channel switching power supply also includes a voltage regulator circuit, which is connected to each of the switching circuits.

7. The multi-channel switching power supply according to any one of claims 1-3, characterized in that, The switching circuit includes a DC-DC converter circuit or an AC-DC converter circuit.

8. An electronic device, characterized in that, It includes a power supply circuit, a multi-channel switching power supply as described in any one of claims 1-7, and a load device.

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