Step-down charging module, charging circuit and charging device

Abstract

The utility model discloses a step-down charging module, a charging circuit and a charging device. The step-down charging module comprises a first chip and a step-down circuit. The first chip is used for being connected with an adapter power supply, communicating with the adapter power supply and determining a first power supply voltage output by the adapter power supply; the first end of the step-down circuit is used for being connected with an adapter power supply, and the second end of the step-down circuit is used for being connected with an output interface and used for carrying out step-down processing on the first power supply voltage and outputting second power supply voltage. The step-down charging module can output a part of power of the adapter power supply to an external terminal needing to be charged, and when a plurality of step-down charging modules are simultaneously connected with the same adapter power supply for application, the output power of the same adapter power supply can be divided into a plurality of parts to be output to different external terminals for charging. And the power of the adapter power supply can be utilized to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, and in particular to a step-down charging module, a charging circuit and a charging device. Background Art

[0002] As PD fast charging technology becomes increasingly mature, the output power of the current PD fast charging adapter power supply is greatly improved compared to before. The 140W and 280W PD fast charging adapter power supplies can power laptops, and this high-power adapter power supply is also compatible with a variety of Typc-C port devices, greatly improving the convenience and versatility of charging.

[0003] However, in addition to laptops, other devices with Typc-C ports, such as mobile phones, usually only require lower charging power such as 48W or 60W when charging. When using this high-power adapter power supply to charge other devices with smaller charging power requirements, the rated output power of the high-power adapter power supply cannot be fully used, which will cause power redundancy. Utility Model Content

[0004] The embodiments of the utility model provide a step-down charging module, a charging circuit and a charging device to solve the problem that the output power of a high-power adapter power supply cannot be fully utilized when it is used with a low-power device.

[0005] The embodiment of the utility model provides a step-down charging module, including a first chip and a step-down circuit;

[0006] The first chip is used to connect to an adapter power supply and communicate with the adapter power supply to determine a first supply voltage output by the adapter power supply;

[0007] The first end of the step-down circuit is used to connect to the adapter power supply, and the second end of the step-down circuit is used to connect to the output interface, and is used to step down the first supply voltage and output a second supply voltage.

[0008] Preferably, the step-down circuit comprises a second chip and a buck circuit;

[0009] The communication terminal of the second chip is connected to the output interface, and is used to communicate with an external terminal connected to the output interface through the output interface to determine the second supply voltage;

[0010] A first end of the second chip is connected to the adapter power supply, a control end of the second chip is connected to a first end of the buck circuit, and a second end of the buck circuit is connected to the output interface;

[0011] The second chip is used to output a PWM signal to the buck circuit according to the magnitude of the second power supply voltage, so that the output voltage of the buck circuit is equal to the second power supply voltage.

[0012] Preferably, the buck circuit comprises an inductor, a first capacitor and a diode;

[0013] The first end of the inductor is connected to the control end of the second chip, and the second end of the inductor is connected to the output interface;

[0014] The first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is grounded;

[0015] A cathode of the diode is connected to a connection node between the inductor and the second chip, and an anode of the diode is grounded.

[0016] Preferably, the step-down circuit further includes a feedback circuit;

[0017] The first end of the feedback circuit is connected to the connection node between the inductor and the first capacitor, and the second end of the feedback circuit is connected to the feedback end of the second chip for outputting a feedback signal to the second chip.

[0018] Preferably, the feedback circuit comprises a first resistor and a second resistor;

[0019] A first end of the first resistor is connected to a feedback end of the second chip, and a second end of the first resistor is connected to a connection node between the inductor and the first capacitor;

[0020] A first end of the second resistor is connected to a connection node between the first resistor and the second chip, and a second end of the second resistor is grounded.

[0021] Preferably, the step-down circuit further includes a protection circuit;

[0022] The first end of the protection circuit is connected to the second end of the buck circuit, and the second end of the protection circuit is connected to the protection end of the second chip, which is used to output an overvoltage protection signal, and the second chip is used to control the shutdown of the buck circuit according to the overvoltage protection signal.

[0023] Preferably, the protection circuit comprises a third resistor and a fourth resistor;

[0024] The third resistor and the fourth resistor are connected in series between the second end of the buck circuit and the ground;

[0025] The protection terminal of the second chip is connected to a connection node between the third resistor and the fourth resistor.

[0026] Preferably, the step-down charging module further includes a second capacitor;

[0027] A first end of the second capacitor is connected to a connection node between the step-down circuit and the adapter power supply, and a second end of the second capacitor is grounded.

[0028] The embodiment of the utility model further provides a charging circuit, comprising an input interface, at least two output interfaces and at least two step-down charging modules as described in any one of the above items;

[0029] The input interface is used to connect to an adapter power supply and receive a first supply voltage output by the adapter power supply;

[0030] The input ends of at least two of the step-down charging modules are connected to the input interface, and the output end of each step-down charging module is correspondingly connected to one of the output interfaces, and the output interface is used to connect to an external terminal;

[0031] The step-down charging module is used to step down the first supply voltage to supply power to the external terminal.

[0032] The embodiment of the utility model also provides a charging device, comprising a housing and the above-mentioned charging circuit;

[0033] The input interface and at least two of the output interfaces are arranged on the housing;

[0034] The step-down charging module is arranged in the shell.

[0035] In the step-down charging module, charging circuit and charging device provided by the embodiments of the utility model, the step-down charging module can step down the voltage output by the adapter power supply, and then output a part of the power of the adapter power supply to the external terminal that needs to be charged. When multiple step-down charging modules are connected to the same adapter power supply at the same time, the output power of the same adapter power supply can be divided into multiple parts and output to different external terminals for charging, which can avoid power redundancy when the adapter power supply is charging a single external terminal and maximize the use of the adapter power supply power. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1This is a circuit diagram of a charging circuit in one embodiment of the utility model;

[0038] Figure 2 It is a structural schematic diagram of a charging device in one embodiment of the utility model.

[0039] In the figure: 1. step-down charging module; 11. step-down circuit; 111. buck circuit; 2. input interface; 3. output interface; 4. casing. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be understood that the utility model can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the utility model to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0042] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0043] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0044] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0045] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0046] An embodiment of the utility model provides a step-down charging module 1, including a first chip U1 and a step-down circuit 11; the first chip U1 is used to connect to an adapter power supply and communicate with the adapter power supply to determine a first supply voltage output by the adapter power supply; the first end of the step-down circuit 11 is used to connect to the adapter power supply, and the second end of the step-down circuit 11 is used to connect to an output interface 3, for stepping down the first supply voltage and outputting a second supply voltage.

[0047] As an example, the buck charging module 1 can be arranged between the adapter power supply and the external terminal, and includes a first chip U1 and a buck circuit 11. The first chip U1 is connected to the adapter power supply, the first end of the buck circuit 11 is connected to the adapter power supply, and the second end is connected to the external terminal through the output interface 3. During the operation of the buck charging module 1, the first chip U1 is connected to the adapter power supply, communicates with the adapter power supply, determines the first supply voltage output by the adapter power supply, and the buck circuit 11 receives the first supply voltage output by the adapter power supply, and bucks the first supply voltage, and outputs the second supply voltage to the external terminal through the output interface 3.

[0048] In this example, the step-down charging module 1 can step down the voltage output by the adapter power supply, and then output part of the power of the adapter power supply to the external terminal that needs to be charged. When multiple step-down charging modules 1 are connected to the same adapter power supply at the same time, the output power of the same adapter power supply can be divided into multiple parts and output to different external terminals for charging. This can avoid power redundancy when the adapter power supply is charging a single external terminal, and maximize the use of the adapter power supply power.

[0049] In one embodiment, the step-down circuit 11 includes a second chip U2 and a buck circuit 111; a communication end of the second chip U2 is connected to the output interface 3, and is used to communicate with an external terminal connected to the output interface 3 through the output interface 3 to determine the second supply voltage; a first end of the second chip U2 is connected to an adapter power supply, a control end SW of the second chip U2 is connected to a first end of the buck circuit 111, and a second end of the buck circuit 111 is connected to the output interface 3; the second chip U2 is used to output a PWM signal to the buck circuit 111 according to the size of the second supply voltage, so that the output voltage of the buck circuit 111 is equal to the second supply voltage.

[0050] As an example, the step-down circuit 11 includes a second chip U2 and a buck circuit 111. The communication end of the second chip U2 is connected to the output interface 3, and is used to communicate with the external terminal, obtain the charging voltage acceptable to the external terminal, and determine the second power supply voltage with the external terminal in combination with the power supply voltage that can be provided by the step-down circuit 11. The first end of the second chip U2 is connected to the adapter power supply, and is used to receive the first power supply voltage output by the adapter power supply. The control end SW of the second chip U2 is connected to the first end of the buck circuit 111, and the second end of the buck circuit 111 is connected to the output interface 3. During the operation of the circuit, the second chip U2 outputs a corresponding PWM signal to the first end of the buck circuit 111 according to the size of the second power supply voltage, so that the output voltage of the second end of the buck circuit 111 is equal to the second power supply voltage.

[0051] In one embodiment, the buck circuit 111 includes an inductor L1, a first capacitor EC1 and a diode D1; the first end of the inductor L1 is connected to the control terminal SW of the second chip U2, and the second end of the inductor L1 is connected to the output interface 3; the first end of the first capacitor EC1 is connected to the second end of the inductor L1, and the second end of the first capacitor EC1 is grounded; the cathode of the diode D1 is connected to the connection node between the inductor L1 and the first chip U1, and the anode of the diode D1 is grounded.

[0052] As an example, the buck circuit 111 includes an inductor L1, a first capacitor EC1 and a diode D1. The inductor L1 and the first capacitor EC1 are connected in series between the control terminal SW of the second chip U2 and the ground, the output interface 3 is connected to the connection node between the inductor L1 and the first capacitor EC1, the cathode of the diode D1 is connected to the connection node between the inductor L1 and the second chip U2, and the anode of the diode D1 is grounded. During the operation of the buck circuit 111, when the PWM signal output by the second chip U2 is a high-level signal, the inductor L1 is magnetized, the current flowing through the inductor L1 increases linearly, the first capacitor EC1 is charged, and the current is output to the external terminal through the output interface 3. When the PWM signal output by the second chip U2 is a low-level signal, the first capacitor EC1 is discharged, the current forms a freewheeling loop through the anode of the diode D1, and the freewheeling current is output to the external terminal through the output interface 3.

[0053] In one embodiment, the buck circuit 11 further includes a feedback circuit; a first end of the feedback circuit is connected to a connection node between the inductor L1 and the first capacitor EC1, and a second end of the feedback circuit is connected to a feedback end FB of the second chip U2, for outputting a feedback signal to the second chip U2.

[0054] As an example, the buck circuit 11 also includes a feedback circuit. The first end of the feedback circuit is connected to the connection node between the inductor L1 and the first capacitor EC1, and the second end of the feedback circuit is connected to the feedback terminal FB of the second chip U2, and a feedback signal is output to the second chip U2. The feedback terminal FB of the second chip U2 can obtain the voltage change at both ends of the first capacitor EC1 by detecting the feedback signal, so as to detect the output of the buck circuit 111 and determine whether the buck circuit 111 is powered according to the preset second power supply voltage. Furthermore, the second chip U2 can adjust the control terminal SW to output a PWM signal with a specific duty cycle when the buck circuit 111 is not powered according to the second power supply voltage, so as to form feedback control on the buck circuit 111.

[0055] In one embodiment, the feedback circuit includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected to the feedback end FB of the second chip U2, and the second end of the first resistor R1 is connected to the connection node between the inductor L1 and the first capacitor EC1; the first end of the second resistor R2 is connected to the connection node between the first resistor R1 and the second chip U2, and the second end of the second resistor R2 is grounded.

[0056] As an example, the feedback circuit includes a first resistor R1 and a second resistor R2. The first end of the first resistor is connected to the feedback terminal FB of the second chip U2, and the second end of the first resistor R1 is connected to the connection node between the inductor L1 and the first capacitor EC1; the first end of the second resistor R2 is connected to the connection node between the first resistor R1 and the second chip U2, and the second end of the second resistor R2 is grounded. The first resistor R1 and the second resistor R2 are used to form a voltage divider for the voltage across the first capacitor EC1. The voltage obtained by the feedback terminal FB is the same as the voltage across the second resistor R2. When the voltage across the second resistor R2 obtained by the feedback terminal FB does not reach the set value, it proves that the buck circuit 111 is not powered according to the second power supply voltage. The second chip U2 can control the adjustment control terminal SW to output a PWM signal with a specific duty cycle, etc., to form feedback control on the buck circuit 111.

[0057] In one embodiment, the step-down circuit 11 also includes a protection circuit; the first end of the protection circuit is connected to the second end of the buck circuit 111, and the second end of the protection circuit is connected to the protection end OVP of the second chip U2, for outputting an overvoltage protection signal to the second chip U2, and the second chip U2 is used to control the shutdown of the buck circuit 111 according to the overvoltage protection signal.

[0058] As an example, the step-down circuit 11 further includes a protection circuit; a first end of the protection circuit is connected to a second end of the buck circuit 111, and a second end of the protection circuit is connected to a protection terminal OVP of the second chip U2, for detecting the voltage output by the buck circuit 111, and outputting an overvoltage protection signal to the second chip U2 when the output voltage of the buck circuit 111 exceeds a preset value. The second chip U2 can control the shutdown of the buck circuit 111 according to the overvoltage protection signal.

[0059] In one embodiment, the protection circuit includes a third resistor R3 and a fourth resistor R4; the third resistor R3 and the fourth resistor R4 are connected in series between the second end of the buck circuit 111 and the ground; the protection terminal OVP of the second chip U2 is connected to the connection node between the third resistor R3 and the fourth resistor R4.

[0060] As an example, the protection circuit includes a third resistor R3 and a fourth resistor R4 connected in series between the second end of the buck circuit 111 and the ground, and the protection end of the second chip U2 is connected to the connection node between the third resistor R3 and the fourth resistor R4. The third resistor R3 and the fourth resistor R4 are used to form a voltage divider for the voltage output by the buck circuit 111. The voltage value obtained by the protection end OVP of the second chip U2 is equal to the voltage value across the fourth resistor R4. When the second chip U2 detects that the voltage value across the fourth resistor R4 is greater than the preset voltage value, the buck circuit 111 can be controlled to be turned off.

[0061] In one embodiment, the step-down charging module 1 further includes a second capacitor EC2; a first end of the second capacitor EC2 is connected to a connection node between the step-down circuit 11 and the adapter power supply, and a second end of the second capacitor EC2 is grounded.

[0062] As an example, the step-down charging module 1 further includes a second capacitor EC2. The first end of the second capacitor EC2 is connected to the connection node between the step-down circuit 11 and the adapter power supply, and the second end of the second capacitor EC2 is grounded, and is used to filter the first supply voltage output by the adapter power supply to avoid the influence of high-frequency noise.

[0063] An embodiment of the utility model provides a charging circuit, comprising an input interface 2, at least two output interfaces 3 and at least two step-down charging modules 1 in any one of the above embodiments; the input interface 2 is used to connect to an adapter power supply and receive a first power supply voltage output by the adapter power supply; the input ends of at least two step-down charging modules 1 are connected to the input interface 2, and the output end of each step-down charging module 1 is correspondingly connected to an output interface 3, and the output interface 3 is used to connect to an external terminal; the step-down charging module 1 is used to step down the first power supply voltage to supply power to the external terminal.

[0064] As an example, the charging circuit includes an input interface 2, at least two output interfaces 3 and at least two step-down charging modules 1 in any of the above examples. The input interface 2 is used to connect to the adapter power supply and receive the first power supply voltage output by the adapter power supply. The input ends of at least two step-down charging modules 1 are connected to the input interface 2, and the output end of each step-down charging module 1 is correspondingly connected to an output interface 3. When the output interface 3 is connected to an external terminal, the step-down charging module 1 will handshake with the external terminal to obtain the voltage value of the second power supply voltage, and then step down the first power supply voltage obtained from the adapter power supply, and output the second power supply voltage to the external terminal connected to the output interface 3 according to the voltage value of the obtained second power supply voltage.

[0065] In this example, multiple step-down charging modules 1 are connected to the same adapter power supply at the same time, so that the output power of the same adapter power supply can be divided into multiple outputs to different external terminals for charging. This can avoid power redundancy when the adapter power supply is charging a single external terminal and maximize the use of the adapter power supply.

[0066] The embodiment of the utility model also provides a charging device, including a housing 4 and the charging circuit in the above embodiment; an input interface 2 and at least two output interfaces 3 are arranged on the housing 4; and a step-down charging module 1 is arranged in the housing 4.

[0067] As an example, the charging device includes a housing 4 and the charging circuit in the above example, the step-down charging module 1 is arranged in the housing 4, and the input interface 2 and at least two output interfaces 3 are opened on the housing 4 for plugging in an adapter power supply and an external terminal.

[0068] In this example, multiple step-down charging modules 1 in the charging device can be connected to the same adapter power supply at the same time, and the output power of the same adapter power supply can be divided into multiple outputs to different external terminals for charging. This can avoid power redundancy when the adapter power supply is charging a single external terminal, and maximize the use of the adapter power supply.

[0069] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such 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, and should be included in the protection scope of the present invention.

Claims

1. A step-down charging module, characterized in that: comprising a first chip and a step-down circuit; The first chip is used to connect to an adapter power supply and communicate with the adapter power supply to determine a first supply voltage output by the adapter power supply; The first end of the step-down circuit is used to connect to the adapter power supply, and the second end of the step-down circuit is used to connect to the output interface, and is used to step down the first supply voltage and output a second supply voltage.

2. The step-down charging module according to claim 1, characterized in that: The step-down circuit includes a second chip and a buck circuit; The communication terminal of the second chip is connected to the output interface, and is used to communicate with an external terminal connected to the output interface through the output interface to determine the second supply voltage; A first end of the second chip is connected to the adapter power supply, a control end of the second chip is connected to a first end of the buck circuit, and a second end of the buck circuit is connected to the output interface; The second chip is used to output a PWM signal to the buck circuit according to the magnitude of the second power supply voltage, so that the output voltage of the buck circuit is equal to the second power supply voltage.

3. The step-down charging module according to claim 2, characterized in that: The buck circuit includes an inductor, a first capacitor and a diode; The first end of the inductor is connected to the control end of the second chip, and the second end of the inductor is connected to the output interface; The first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is grounded; A cathode of the diode is connected to a connection node between the inductor and the second chip, and an anode of the diode is grounded.

4. The step-down charging module according to claim 3, characterized in that: The step-down circuit further includes a feedback circuit; The first end of the feedback circuit is connected to the connection node between the inductor and the first capacitor, and the second end of the feedback circuit is connected to the feedback end of the second chip for outputting a feedback signal to the second chip.

5. The step-down charging module according to claim 4, characterized in that: The feedback circuit includes a first resistor and a second resistor; A first end of the first resistor is connected to a feedback end of the second chip, and a second end of the first resistor is connected to a connection node between the inductor and the first capacitor; A first end of the second resistor is connected to a connection node between the first resistor and the second chip, and a second end of the second resistor is grounded.

6. The step-down charging module according to claim 2, characterized in that: The step-down circuit also includes a protection circuit; The first end of the protection circuit is connected to the second end of the buck circuit, and the second end of the protection circuit is connected to the protection end of the second chip, which is used to output an overvoltage protection signal, and the second chip is used to control the shutdown of the buck circuit according to the overvoltage protection signal.

7. The step-down charging module according to claim 6, characterized in that: The protection circuit includes a third resistor and a fourth resistor; The third resistor and the fourth resistor are connected in series between the second end of the buck circuit and the ground; The protection terminal of the second chip is connected to a connection node between the third resistor and the fourth resistor.

8. The step-down charging module according to claim 1, characterized in that: The step-down charging module also includes a second capacitor; A first end of the second capacitor is connected to a connection node between the step-down circuit and the adapter power supply, and a second end of the second capacitor is grounded.

9. A charging circuit, characterized in that: It comprises an input interface, at least two output interfaces and at least two step-down charging modules according to any one of claims 1 to 8; The input interface is used to connect to an adapter power supply and receive a first supply voltage output by the adapter power supply; The input ends of at least two of the step-down charging modules are connected to the input interface, and the output end of each step-down charging module is correspondingly connected to one of the output interfaces, and the output interface is used to connect to an external terminal; The step-down charging module is used to step down the first supply voltage to supply power to the external terminal.

10. A charging device, characterized in that: comprising a housing and the charging circuit according to claim 9; The input interface and at least two of the output interfaces are arranged on the housing; The step-down charging module is arranged in the shell.

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