CN218300998U - Multi-interface charging circuit - Google Patents

Abstract

The utility model relates to a many interfaces charging circuit, including adapter circuit, two way buck circuit at least, two way at least charge interface and two way at least charging protocol circuits. The adapter circuit converts an external alternating current power supply into a first direct current voltage, and the same number of voltage reduction circuits, charging interfaces and charging protocol circuits are sequentially configured at the same output end of the adapter circuit to form charging interface circuits which can work independently, so that mutual interference among a plurality of charging interfaces can be avoided, and the problem of overlarge product size is avoided by sharing the same adapter circuit, namely sharing the same alternating current-to-direct current power supply circuit.

Description

Multi-interface charging circuit

Technical Field

The utility model relates to a technical field that charges especially relates to a many interfaces charging circuit.

Background

Along with the development of charging technology, people have more and more requirements on charging scenes, and a traditional single-port charger or a single-port charging socket cannot meet the requirements of people, so that a charger or a charging socket for double-port charging or even multi-port charging is provided, but the problem that USB (Universal Serial Bus) ports interfere with each other exists when the existing double-port charger or multi-port charger is charged.

In the prior art, for the USB ports to work without interfering with each other, the USB power supply needs to be independently switched from the input end, and multiple groups of independent power supplies and transformers are used for independent power supply, so that the product volume is overlarge, and the product cost is increased.

SUMMERY OF THE UTILITY MODEL

Therefore, a small-size multi-interface charging circuit based on the charging interface which does not interfere with each other during operation is needed.

The embodiment of the application provides a many interfaces charging circuit, includes:

the input end of the adaptation circuit is used for being connected with an external alternating current power supply, the output end of the adaptation circuit is used for outputting a first direct current voltage, and the adaptation circuit is used for converting the alternating current voltage of the external alternating current power supply into the first direct current voltage;

the input end of each voltage reduction circuit is connected with the same output end of the adaptive circuit so as to be connected with a first direct current voltage;

the number of the charging interfaces is consistent with that of the voltage reduction circuits, and the output end of each charging interface is used for connecting electric equipment;

the input ends of the charging protocol circuits are connected with the output ends of the voltage reduction circuits in a one-to-one correspondence mode, and the output ends of the charging protocol circuits are connected with the input ends of the charging interfaces in a one-to-one correspondence mode; each charging protocol circuit is used for controlling the connected voltage reduction circuit to carry out voltage reduction processing on the first direct current, so that the charging interface is charged with charging power adaptive to the connected electric equipment.

In one embodiment, the adaptation circuit comprises:

the input end of the main rectifying circuit is used for connecting an external alternating current power supply;

the primary side of the transformer is connected with the output end of the main rectifying circuit;

the control end of the control circuit is connected with the primary side of the transformer and used for controlling the primary side of the transformer to work or not work so as to obtain a pulse signal on the secondary side of the transformer;

the input end of the power supply circuit is connected with the primary side of the transformer, and the output end of the power supply circuit is connected with the power supply end of the control circuit;

and the input end of the synchronous rectification circuit is connected with the secondary side of the transformer and is used for converting the pulse signal into a first direct-current voltage and outputting the first direct-current voltage through the first output end of the synchronous rectification circuit.

In one embodiment, the control circuit comprises:

the input end of the starting module is connected with the first end of the primary side;

the first input end of the pulse modulation circuit is connected with the output end of the starting module, and the power supply end of the pulse modulation circuit is connected with the output end of the power supply circuit;

and the input end of the driving module is connected with the control end of the pulse modulation circuit, and the output end of the driving module is connected with the second end of the primary side of the transformer.

In one embodiment, the driving module includes:

and the controlled end of the electronic switching tube is connected with the control end of the pulse modulation circuit, the first polarity end of the electronic switching tube is connected with the second end of the primary side, and the second polarity end of the electronic switching tube is grounded.

In one embodiment, the electronic switching tube is a gallium nitride field effect transistor.

In one embodiment, the control circuit further comprises:

and the input end of the first protection circuit is connected with the first end of the primary side of the transformer, and the output end of the first protection circuit is connected with the second input end of the pulse modulation circuit.

In one embodiment, the adaptation circuit comprises:

and the input end of the second protection circuit is used for being connected with an external alternating current power supply, and the output end of the second protection circuit is connected with the input end of the main rectification circuit.

In one embodiment, the adaptation circuit further comprises:

and the input end of the feedback circuit is connected with the second output end of the synchronous rectification circuit, and the output end of the feedback circuit is connected with the feedback end of the control circuit.

In one embodiment, the adaptation circuit further comprises:

and the input end of the anti-interference circuit is used for being connected with an external alternating current power supply, and the output end of the anti-interference circuit is connected with the input end of the main rectifying circuit.

In one embodiment, the adaptation circuit further comprises:

and the input end of the filter circuit is connected with the output end of the main rectifying circuit, and the output end of the filter circuit is connected with the primary side of the transformer.

The multi-interface charging circuit comprises an adapter circuit, at least two voltage reduction circuits, at least two charging interfaces and at least two charging protocol circuits. The adapter circuit converts an external alternating current power supply into a first direct current voltage, and the same number of voltage reduction circuits, charging interfaces and charging protocol circuits are sequentially configured at the same output end of the adapter circuit to form charging interface circuits which can work independently, so that mutual interference among a plurality of charging interfaces can be avoided, and the problem of overlarge product size is avoided by sharing the same adapter circuit, namely sharing the same alternating current-to-direct current power supply circuit. A charging circuit is provided which is capable of outputting voltages to respective charging interfaces without interfering with each other and which is low in cost and applicable to various types of chargers.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating an application environment of a multi-interface charging circuit according to an embodiment;

fig. 2 is a schematic structural diagram of a multi-interface charging circuit according to an embodiment;

fig. 3 is a schematic structural diagram of a multi-interface charging circuit according to another embodiment;

FIG. 4 is a schematic structural diagram of a multi-interface charging circuit according to yet another embodiment;

FIG. 5 is a schematic diagram of an EMC protection circuit of an embodiment;

FIG. 6 is a schematic diagram of a rectifying and filtering circuit according to an embodiment;

FIG. 7 is a schematic diagram of a transformer according to an embodiment;

FIG. 8 is a schematic diagram of a control circuit according to an embodiment;

FIG. 9 is a schematic diagram of an auxiliary power circuit according to an embodiment;

FIG. 10 is a schematic diagram of a synchronous rectification circuit of an embodiment;

FIG. 11 is a schematic diagram of a feedback circuit according to an embodiment;

FIG. 12 is a schematic diagram of a first buck circuit according to an embodiment;

FIG. 13 is a diagram of a second buck circuit according to one embodiment;

FIG. 14 is a schematic diagram of a first charging protocol circuit, according to an embodiment;

FIG. 15 is a schematic diagram of a second charging protocol circuit of an embodiment;

fig. 16 is a schematic diagram of the first charging interface circuit and the second charging interface circuit according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

In this embodiment, the multi-interface charging circuit 20 may be applied to the application environment shown in fig. 1. The multi-interface charging circuit 20 is internally arranged in the charger 2, and can be connected with at least two charging devices (a first charging device 6 and an Nth charging device 6) through at least two charging interfaces 280 of the multi-interface charging circuit 20 (a first interface to an Nth interface) to charge the multi-interface charging circuit 20, and the adapter circuit of the multi-interface charging circuit 20 is also used for being connected with an external alternating current power supply 4, so that the charger 2 carrying the multi-interface charging circuit 20 can perform voltage adaptation and power distribution by using the external power supply (such as 220V alternating current), and provide adaptive charging power for each path of charging device.

As shown in fig. 2-16, a multi-interface charging circuit is provided, and in one embodiment, as shown in fig. 2, the multi-interface charging circuit includes an adaptation circuit 220, at least two-way voltage-reducing circuit 240, at least two charging interfaces 280, and at least two-way charging protocol circuit 260.

The input end of the adapting circuit 220 is used for connecting the external alternating current power supply 4, the output end of the adapting circuit 220 is used for outputting a first direct current voltage, and the adapting circuit 220 is used for converting the alternating current voltage of the external alternating current power supply 4 into the first direct current voltage; the input end of each voltage reduction circuit 240 is connected with the same output end of the adaptation circuit 220 so as to access a first direct current voltage; the number of the charging interfaces 280 is the same as that of the voltage reduction circuits 240, and the output end of each charging interface 280 is used for connecting electric equipment; the input end of each charging protocol circuit 260 is correspondingly connected with the output end of the voltage reduction circuit 240, and the output end of each charging protocol circuit 260 is correspondingly connected with the input end of the charging interface 280; each charging protocol circuit 260 is configured to control the connected voltage dropping circuit 240 to drop the first dc voltage, so that the charging interface 280 charges with the charging power adapted to the connected electric device.

The adapting circuit 220 refers to an integrated circuit capable of converting the ac voltage output by the external ac power source 4 into a first dc voltage, for example, the adapting circuit 220 may include, but is not limited to, a rectifier and a transformer 32; the voltage reducing circuit 240 is configured to reduce the first dc voltage output by the adapting circuit 220 to an actually required dc voltage to adapt to the charging protocol circuit 260, and specifically, the voltage reducing circuit 240 may be a buck (voltage-reducing conversion) circuit; the charging protocol circuit 260 includes a charging protocol chip that is compatible with, but not limited to, USB PD (USB Power Delivery) and QC (Quick Charge); the at least two charging interfaces 280 may be one or a combination of Micro USB and Type-C.

Specifically, based on the above introduced circuit structure, the multi-interface charging circuit provided in this embodiment of the application first converts the ac power of the external ac power supply 4 into the first dc voltage by the adapter circuit 220, and then forms the multiple independent charging paths at the rear end of the adapter circuit 220 by configuring the same number of the voltage reduction circuits 240, the charging interfaces 280 and the charging protocol circuits 260 at the same output end of the adapter circuit 220, and during operation, the charging protocol circuits 260 may control the voltage reduction circuits 240 to convert the first dc voltage into the charging signal adapted to the charging device according to the parameters of the charging device connected to each charging interface 280 based on the configured charging protocol, so as to ensure that the charging is performed with the charging power adapted to the charging device. The multi-interface charging of the single adapter circuit 220 is realized, and the voltage output to each interface is lower.

In one embodiment, the multi-interface charging circuit can be applied to a 220V external ac power source 4. The adapting circuit 220 may include a rectifier, a transformer 32, and other devices, and may convert the 220V ac power into a dc voltage with a voltage peak as high as 380V, and then further convert the 380V output dc voltage into a first dc voltage adapted to the voltage reducing circuit 240 and the charging protocol circuit 260 by using a voltage converting circuit inside the adapting circuit 220.

Wherein, under a specific type of the adaptation circuit 220, the first direct current voltage may be 24V. The first direct current voltage is transmitted to the voltage-reducing circuit 240. The charging protocol circuit 260 is connected to an external charging device through the charging interface 280, and the charging protocol circuit 260 controls the step-down circuit 240 to perform step-down processing on the input first direct-current voltage according to specific parameters of the charging device based on a charging protocol, and adjusts corresponding output current, so as to realize power distribution of each step-down circuit 240, and output charging power adapted to the charging device.

For example, in one embodiment of charging power distribution, there are two charging interfaces, and each charging device can be automatically identified to output matching power. For different charging devices, in the charging circuit provided in the embodiment of the present application, the maximum output supported by a single charging interface may reach 5V3A, 9V3A, 12V3A, 15V3A, and 20V3.25A, respectively. When the two interfaces work simultaneously, the charging protocol circuit automatically distributes power based on the charging equipment connected with each charging interface under the condition that the maximum power supported by the adapter circuit is not exceeded, for example, when the maximum power output by the adapter circuit is 65W, and when one of the charging interfaces outputs 5V3A, the charging protocol circuit can distribute charging power of not more than 50W for the other charging interface. In a specific embodiment, under a specific selection of the charging protocol circuit, it is supported that any one of the following charging powers is allocated to one of the charging interfaces: 5V3A, 9V2.22A, 12V1.67A, 15V1.33A, or 20V1A, and supports allocation of any of 5V3A, 9V3A, 12V3A, 15V3A, or 20V2.25A charging power to another charging interface. The charger can charge various terminal devices, and can be widely applied to families, offices and various commercial places.

In one embodiment, the adaptation circuit may include a primary rectification circuit 30, a transformer 32, a control circuit 36, a power supply circuit 38, and a synchronous rectification circuit 34 as shown in fig. 3.

The input end of the main rectifying circuit 30 is used for connecting an external alternating current power supply 4, the primary side of the transformer 32 is connected with the output end of the main rectifying circuit 30, the control end of the control circuit 36 is connected with the primary side of the transformer 32 and is used for controlling the primary side of the transformer 32 to work or not work so as to obtain a pulse signal on the secondary side of the transformer 32, the input end of the power supply circuit 38 is connected with the primary side of the transformer 32, the output end of the power supply circuit 38 is connected with the power supply end of the control circuit 36, the input end of the synchronous rectifying circuit 34 is connected with the secondary side of the transformer 32 and is used for converting the pulse signal into a first direct current voltage and outputting the first direct current voltage through the first output end of the synchronous rectifying circuit 34.

The main rectification circuit 30 is used for converting the external ac power source 4 into a dc voltage, wherein the main rectification circuit 30 may be a full-bridge or half-bridge rectification circuit, and a circuit structure of the main rectification circuit 30 is determined by an application scenario of the multi-interface charging circuit. The synchronous rectification circuit 34 is configured to rectify the pulse voltage generated on the secondary side of the transformer 32 into a desired first dc voltage. The synchronous rectification circuit 34 may include a synchronous rectification controller and other circuits integrated on the periphery of the synchronous rectification controller based on the specific type of the synchronous rectification controller, for example, the synchronous rectification controller and its peripheral circuits shown in fig. 10 may be used to obtain the first direct-current voltage, and it should be understood by those skilled in the art that the type selection and connection relationship of the components in the drawings all belong to the embodiments of the multi-interface charging circuit provided in the present application, but it should be noted that the implementation manner does not limit the protection scope of the present application. The power supply circuit 38 is used for supplying power to the control circuit 36, and can convert the dc power at the primary side of the transformer 32 into an operating voltage of the control circuit 36, so as to provide a stable and adaptive dc operating voltage for the control circuit 36. The signal output from the control terminal of the control circuit 36 determines the operating state of the transformer 32, thereby regulating the pulse signal output from the secondary side of the transformer 32.

Specifically, after the main rectifier circuit 30 receives the ac voltage from the external ac power supply 4, the input ac voltage is converted into a dc voltage by the rectifier bridge of the main rectifier circuit 30 and output to the primary side of the transformer 32, the dc voltage output from the primary side of the transformer 32 is input to the power supply circuit 38, and the power supply circuit 38 converts the input dc voltage into a second dc voltage adapted to the control circuit 36; the control circuit 36 continuously controls the operation or non-operation of the primary side of the transformer 32, that is, the cyclic on/off of the transformer 32, when the second dc voltage is stably supplied, so as to generate a pulse signal on the secondary side of the transformer 32, and after receiving the pulse signal, the synchronous rectification controller in the synchronous rectification circuit 34 controls the on/off of a switching device (for example, an electronic switching tube 362 such as a MOS tube) in a peripheral circuit of the synchronous rectification controller (the peripheral circuit is a circuit capable of converting the pulse signal into a stable first dc signal), so as to convert the pulse signal into a first dc voltage, and output the first dc voltage to the subsequent step-down circuit 240.

In addition, the synchronous rectification circuit 34 may include other devices as shown in fig. 10 in addition to the switching device and the synchronous rectification controller to achieve functions such as filtering, and the device selection and the connection relationship of the synchronous rectification circuit 34 as shown in fig. 10 belong to embodiments to be protected in the present application, and according to the device connection relationship in the figure, a person skilled in the art knows that the synchronous rectification circuit 34 provides a more stable first direct current voltage through filtering, and the like, and all belong to the beneficial effects of the multi-interface charging circuit provided by the embodiment of the present application. For other advantages of the specific implementation of each circuit module shown in the drawings, further description is omitted here.

The adaptation circuit 220 converts the ac voltage input by the external ac power supply 4 into the dc voltage through the main rectification circuit 30, so as to provide a basis for the realization of the subsequent circuit functions, and the primary side of the transformer 32 is connected to the power supply circuit 38, so as to convert the dc voltage output by the primary side of the transformer 32 into the stable dc voltage suitable for the control circuit 36, thereby ensuring the normal and stable operation of the control circuit 36. Then, the control circuit 36 outputs a corresponding modulation signal to control the presence or absence of the output signal of the secondary side of the transformer 32, and further modulates the pulse signal of the secondary side of the transformer 32, thereby adapting the synchronous rectification circuit 34. The synchronous rectification circuit 34 further converts the pulse signal into a stable first dc voltage suitable for the step-down circuit 240, so as to provide a stable dc voltage for subsequent charging, and prevent the step-down circuit 240 from being damaged due to an excessively high first dc voltage.

In one embodiment, as shown in FIG. 3, the control circuit 36 includes a start module 368, a pulse modulation circuit 360, and a drive module 362. The input end of the starting module 368 is connected to the first end of the primary side, the first input end of the pulse modulation circuit 360 is connected to the output end of the starting module 368, the power supply end of the pulse modulation circuit 360 is connected to the output end of the power supply circuit 38, the input end of the driving module 362 is connected to the control end of the pulse modulation circuit 360, and the output end of the driving module 362 is connected to the second end of the primary side of the transformer 32.

Specifically, the voltage output by the primary side of the transformer 32 is input to the starting module 368, the starting module 368 outputs a corresponding enable signal for starting the pulse modulation circuit 360 after modulation, and the subsequent pulse modulation circuit 360 can continuously output the pulse width modulation signal to the driving module 362 under the condition that the power supply circuit 38 stably supplies power, so as to control the on-off of the driving module 362, thereby controlling the transformer 32 to generate a pulse signal on the secondary side, and by regulating and controlling the on-off duration, the duty ratio of the pulse signal on the secondary side can be regulated and controlled, thereby realizing modulation of the pulse signal.

The control circuit 36 realizes the isolation of start triggering and stable power supply through the built-in start module 368, ensures the stable start and work of the pulse chip, and simultaneously matches the drive module 362 to realize more accurate pulse width modulation and ensure the stable output of the pulse signal at the secondary side of the transformer 32.

In one embodiment, as shown in fig. 3, the driving module 362 includes an electronic switch 362, a controlled terminal of the electronic switch 362 is connected to a control terminal of the pulse modulation circuit 360, a first polarity terminal of the electronic switch 362 is connected to a second terminal of the primary side, and a second polarity terminal of the electronic switch 362 is grounded.

The electronic switch 362 includes, but is not limited to, one or more of a relay, a Field Effect Transistor (FET), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS). The driving module 362 can further increase the on-off frequency of the driving module 362 by using the transistor, so as to further increase the on-off frequency of the primary side of the transformer 32, and further increase the power of the pulse signal output by the secondary side of the transformer 32.

In one embodiment, the electronic switch 362 is a gan field effect transistor.

The gallium nitride field effect transistor is a field effect transistor taking gallium nitride and aluminum gallium nitride as base materials, and because the gallium nitride material has good heat dissipation performance, high breakdown electric field and high saturation speed, compared with the equivalent silicon field effect transistor, the gallium nitride field effect transistor has the advantages of lower grid capacitance, lower grid driving voltage, higher rated voltage capability and small volume.

By using the gan effect transistor as the electronic switch 362, the switching frequency can be increased, and the power of the pulse signal output can be further increased while the volume of the whole product is reduced.

In one embodiment, as shown in fig. 4, the control circuit 36 further includes: an input terminal of the first protection circuit 364 is connected to a first terminal of the primary side of the transformer 32, and an output terminal of the first protection circuit 364 is connected to a second input terminal of the pulse modulation circuit 360.

The first protection circuit 364 is used for detecting the voltage on the primary side of the transformer 32, and when the voltage on the primary side of the transformer 32 is higher than the threshold voltage, outputs an overvoltage signal to the pulse width modulation chip to control the pulse modulation circuit 360 to start, so as to prevent the pulse modulation circuit 360 from being started by mistake under the condition of high voltage and damaging the chip.

In one embodiment, as shown in fig. 4, the adaptation circuit 220 includes: and an input end of the second protection circuit 40 is used for being connected with the external alternating current power supply 4, and an output end of the second protection circuit 40 is connected with an input end of the main rectification circuit 30.

Specifically, the second protection circuit 40 may include a fuse connected in series between the external ac power source 4 and the main rectification circuit 30, and the fuse blows when the output voltage or the output current of the external power source is too high or too large to protect subsequent circuit devices from being damaged. In addition, when the main rectification circuit 30 has a fault, the current generated by the main rectification circuit 30 will suddenly increase, that is, the current of the primary side of the transformer 32 of the adapter circuit 220 increases instantly, at this time, the second protection circuit 40 arranged between the external alternating current power supply 4 and the main rectification circuit 30 is disconnected, so that the damage of the main rectification circuit 30 caused by the overlarge current is avoided, and the influence on the normal power supply of the power grid side and the safety accident caused by the disconnection of the main rectification circuit 30 and the external alternating current power supply 4 can also be avoided, so that the use stability of the transformer rectification circuit is improved.

In one embodiment, as shown in fig. 4, the adaptation circuit 220 further comprises a feedback circuit 46, an input terminal of the feedback circuit 46 is connected to the second output terminal of the synchronous rectification circuit 34, and an output terminal of the feedback circuit 46 is connected to the feedback terminal of the control circuit 36.

The feedback circuit 46 receives the voltage signal (which may or may not be the first dc voltage) output by the synchronous rectification circuit 34 and outputs a corresponding feedback signal to the control circuit 36 according to the voltage signal. Specifically, the control circuit 36 can know whether the first dc voltage output by the synchronous rectification circuit 34 is lower than the input voltage required by the step-down circuit 240 according to the magnitude of the feedback signal, and if the first dc voltage output by the synchronous rectification circuit 34 is lower than the input voltage, the control circuit 36 adjusts the modulation signal output to the driving module 362 based on the feedback signal (at this time, the feedback signal may be a positive feedback signal), increases the duty ratio of the pulse signal output by the secondary side of the transformer 32, and further increases the first dc voltage output by the synchronous rectification circuit 34. When the control circuit 36 determines that the first dc voltage output by the synchronous rectification circuit 34 is higher than the input voltage required by the step-down circuit 240 according to the feedback signal (at this time, the feedback signal may be a negative feedback signal), the control circuit 36 regulates and controls the operating state of the transformer 32 to reduce the output voltage on the secondary side of the transformer 32, so as to reduce the first dc voltage output by the synchronous rectification circuit 34.

The voltage output of the adaptive circuit 220 can be adjusted in real time through the access of the feedback circuit 46, so that the output voltage is further accurately regulated and controlled, and the stability of the output voltage is ensured.

In one embodiment, as shown in fig. 4, the adapting circuit 220 further comprises an anti-jamming circuit 42, an input terminal of the anti-jamming circuit 42 is used for connecting with the external ac power source 4, and an output terminal of the anti-jamming circuit 42 is connected with an input terminal of the main rectifying circuit 30.

The immunity circuit 42 refers to the integration of a series of electronic components for absorbing high frequency interference signals, for example, including but not limited to one or more of common mode inductance and capacitance. In this embodiment, for example, the anti-jamming circuit 42 is a common-mode inductor, and the common-mode inductor is a magnetic core inductor, where the magnetic core is a ferrite magnet, and attenuates the high-frequency signal, and since 100 Ω impedance is generated when the high-frequency signal exceeding 15MHz acts on the common-mode inductor of the ferrite magnet, the common-mode inductor is used to attenuate the high-frequency signal, so that the electromagnetic interference on the rectifying and filtering circuit 44 is reduced, and the electromagnetic interference on the transformer rectifying circuit is reduced.

In one embodiment, as shown in fig. 4, the adapting circuit 220 further includes a filter circuit 44, an input terminal of the filter circuit 44 is connected to an output terminal of the main rectifying circuit 30, and an output terminal of the filter circuit 44 is connected to the primary side of the transformer 32.

Specifically, the filter circuit 44 may be an RC filter circuit 44 or other type of filter circuit 44. For example, as shown in fig. 11, the filter circuit 44 may include a plurality of capacitors, inductors, and magnetic beads, and the selection types and the numbers of the capacitors, the inductors, and the magnetic beads are not limited to the embodiments shown in the drawings, and the specific connection relationship thereof may be determined based on the specific selection type, which is not described herein again. In the present application, as an example, the capacitor used by the filter circuit 44 is an electrolytic capacitor, and has a larger capacitance, because the filter circuit 44 is not provided with a transformer circuit before, that is, the dc voltage signal input to the filter circuit 44 is not stepped down, so that the voltage value of the dc voltage signal input to the filter circuit 44 is larger, and for the case of a larger input voltage, the filter circuit 44 performs filtering by using the electrolytic capacitor, and the filter circuit 44 has a higher voltage resistance by forming a filter loop with an inductor. Further, the inductor used is an iron core inductor, that is, the inductor is a magnetic core inductor, so that the inductance value of the filter circuit 44 is relatively large, thereby facilitating filtering of the high-frequency voltage signal.

To further illustrate the present application, a specific example is described below, which takes a gallium nitride charger as an example. As shown in fig. 5 to 16, the circuit components of the gan charger mainly include an adaptation circuit 220220 (flyback switching power supply of 24V DC), at least two buck circuits 240 (two buck circuits), and at least two charging circuits (two charging protocol control circuits).

Specifically, the 24VDC flyback switching power supply includes a second protection circuit and an anti-interference circuit (EMC (electromagnetic compatibility) protection circuit), a main rectification circuit and a filter circuit (rectification filter circuit), a power supply circuit (auxiliary power supply circuit), a synchronous rectification circuit (synchronous rectification circuit), and a feedback circuit (feedback circuit).

Further, the electronic components and the specific connection relationship included in the EMC protection circuit are shown in fig. 5, which is not described herein again, the input terminals of the EMC protection circuit, i.e., the live line terminal L and the neutral line terminal N, are used for connecting with an external ac power supply, and the output terminal of the EMC protection circuit is connected with the input terminal of the rectifying and filtering circuit (shown in fig. 6); the rectification filter circuit comprises a rectification bridge, a plurality of capacitors, an inductor and a magnetic bead, and the specific connection relationship is shown in fig. 6 and is not described herein again; the output end of the rectifying and filtering circuit is connected with the first end of the primary side of the transformer T1 (shown in figure 7); the first end of the primary side of the transformer is also connected with the input end of the control circuit (shown in fig. 8), the first end of the primary side of the transformer is also connected with the input end of the auxiliary power supply circuit (shown in fig. 9), the second end of the primary side of the transformer is connected with the output end of the control circuit, and the first end of the secondary side of the transformer is connected with the input end of the synchronous rectification circuit (shown in fig. 10); the power supply end of the control circuit is connected with the output end of the auxiliary power supply circuit; an input end (VCC end) of a feedback circuit (as shown in fig. 11) is connected with a first output end (VCC end) of the synchronous rectification circuit, and an output end (FB end) of the feedback circuit is connected with a feedback end (FB end) of the control circuit; the input terminal (24 VDC terminal) of the first step-down circuit 240 (shown in fig. 12) and the input terminal (24 VDC terminal) of the second step-down circuit 240 (shown in fig. 13) are commonly connected to the second output terminal (24 VDC terminal) of the synchronous rectification, and the output terminal of the first step-down circuit 240 and the output terminal of the second step-down circuit 240 are respectively connected to the input terminals of the corresponding first charging protocol circuit 260 (shown in fig. 14) and second charging protocol circuit 260 (shown in fig. 15); as shown in fig. 16, the output terminal (VBUS _ C1 terminal) of the first charging protocol circuit 260 and the output terminal (VBUS _ C2 terminal) of the second charging protocol circuit 260 are also connected to the input terminal (VBUS _ C1 terminal) of the first charging interface 280 circuit and the input terminal (VBUS _ C1 terminal) of the second charging interface 280 circuit, respectively.

As shown in fig. 8, the control circuit includes a starting module, a first protection circuit, and a driving module, and the specific connection relationship between the modules or circuits is described with reference to fig. 8, and is not described herein again. Specifically, the driving module comprises a gallium nitride field effect transistor Q1, a first resistor R6, a second resistor R7, a third resistor R8, a fourth resistor R5 and a first capacitor C10;

a first end of the first resistor R6 is connected to a source of the gan fet, a first end of the second resistor R7 is connected to a source of the gan fet, a first end of the first resistor R6 is connected to a second end of the second resistor R7 and grounded, a first end of the third resistor R8 is connected to a source of the gan fet, a second end of the third resistor R8 is connected to a second output terminal of the pulse modulation circuit, a first end of the fourth resistor R5 is connected to a gate of the gan fet, a second end of the fourth resistor R5 is connected to a third output terminal of the pulse modulation circuit, a drain of the gan fet is connected to a second end of the primary side of the transformer, a first end of the first capacitor C10 is connected to a second end of the primary side of the transformer, and a second end of the first capacitor C10 is grounded.

The multi-interface charging circuit of the present application includes an adaptation circuit 220, at least two voltage reduction circuits 240, at least two charging interfaces 280, and at least two charging protocol circuits 260. The adapter circuit 220 converts an external ac power into a dc voltage, and the voltage dropping circuit 240, the charging interface 280 and the charging protocol circuit 260 with the same number are configured at the same output terminal of the adapter circuit 220 to form an independent charging interface 280 circuit, thereby realizing multi-interface charging of a single power supply, further enabling voltages output to each interface not to interfere with each other and having lower cost.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A multi-interface charging circuit, comprising:

the input end of the adaptation circuit is used for being connected with an external alternating current power supply, the output end of the adaptation circuit is used for outputting a first direct current voltage, and the adaptation circuit is used for converting the alternating current voltage of the external alternating current power supply into the first direct current voltage;

the input end of each voltage reduction circuit is connected with the same output end of the adaptive circuit so as to be connected with the first direct-current voltage;

the number of the charging interfaces is consistent with that of the voltage reduction circuits, and the output end of each charging interface is used for connecting electric equipment;

the input end of each charging protocol circuit is connected with the output end of the voltage reduction circuit in a one-to-one correspondence mode, and the output end of each charging protocol circuit is connected with the input end of the charging interface in a one-to-one correspondence mode; each charging protocol circuit is used for controlling the connected voltage reduction circuit to carry out voltage reduction processing on the first direct current, so that the charging interface is charged with charging power adaptive to the connected electric equipment.

2. The multi-interface charging circuit of claim 1, wherein the adaptation circuit comprises:

the input end of the main rectifying circuit is used for connecting the external alternating current power supply;

the primary side of the transformer is connected with the output end of the main rectifying circuit;

the control end of the control circuit is connected with the primary side of the transformer and used for controlling the primary side of the transformer to work or not work so as to obtain a pulse signal on the secondary side of the transformer;

the input end of the power supply circuit is connected with the primary side of the transformer, and the output end of the power supply circuit is connected with the power supply end of the control circuit;

and the input end of the synchronous rectification circuit is connected with the secondary side of the transformer and is used for converting the pulse signal into the first direct-current voltage and outputting the first direct-current voltage through the first output end of the synchronous rectification circuit.

3. The multi-interface charging circuit of claim 2, wherein the control circuit comprises:

the input end of the starting module is connected with the first end of the primary side;

the first input end of the pulse modulation circuit is connected with the output end of the starting module, and the power supply end of the pulse modulation circuit is connected with the output end of the power supply circuit;

and the input end of the driving module is connected with the control end of the pulse modulation circuit, and the output end of the driving module is connected with the second end of the primary side of the transformer.

4. The multi-interface charging circuit of claim 3, wherein the driving module comprises:

and the controlled end of the electronic switching tube is connected with the control end of the pulse modulation circuit, the first polarity end of the electronic switching tube is connected with the second end of the primary side, and the second polarity end of the electronic switching tube is grounded.

5. The multi-interface charging circuit of claim 4, wherein the electronic switching device is a GaN field effect transistor.

6. The multi-interface charging circuit of claim 3, wherein the control circuit further comprises:

and the input end of the first protection circuit is connected with the first end of the primary side of the transformer, and the output end of the first protection circuit is connected with the second input end of the pulse modulation circuit.

7. The multi-interface charging circuit of claim 2, wherein the adaptation circuit comprises:

and the input end of the second protection circuit is used for being connected with an external alternating current power supply, and the output end of the second protection circuit is connected with the input end of the main rectification circuit.

8. The multi-interface charging circuit of claim 2, wherein the adapter circuit further comprises:

and the input end of the feedback circuit is connected with the second output end of the synchronous rectification circuit, and the output end of the feedback circuit is connected with the feedback end of the control circuit.

9. The multi-interface charging circuit of claim 2, wherein the adapter circuit further comprises:

and the input end of the anti-interference circuit is used for being connected with an external alternating current power supply, and the output end of the anti-interference circuit is connected with the input end of the main rectifying circuit.

10. The multi-interface charging circuit of claim 2, wherein the adapter circuit further comprises:

and the input end of the filter circuit is connected with the output end of the main rectifying circuit, and the output end of the filter circuit is connected with the primary side of the transformer.

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