CN216122379U - Conversion circuit and device - Google Patents

Abstract

The application provides a converting circuit and device, converting circuit includes: first resistance, voltage stabilizing circuit, power cord, earth connection and identification line, wherein: the first end of the voltage stabilizing circuit is connected with the first end of the first resistor, the second end of the voltage stabilizing circuit is connected with the grounding wire, the third end of the voltage stabilizing circuit is connected with the power wire, and the second end of the first resistor is connected with the identification wire. The conversion circuit and the device can realize parameter matching and data transmission between interfaces of two different types, and can ensure that the voltage on the identification line cannot exceed a safety threshold value through the voltage stabilizing circuit, so that the safety of devices is effectively guaranteed, and the cost is lower.

Description

Conversion circuit and device

Technical Field

The application relates to the technical field of conversion circuits, in particular to a conversion circuit and a device.

Background

In the field of conversion circuits, in order to solve the problems of parameter matching and data transmission between two interfaces of different types, bus signals are often required to be adjusted to avoid the problems of connection errors and even component faults caused by mismatching of transmission parameters of the interfaces. In the existing scheme, a Type-A plug is directly connected with a Type-C USB (universal serial bus) plug, and a CC signal of the Type-C plug reaches a power line VBU (voltage source unit) through a pull-up resistor.

In the course of conceiving and implementing the present application, the applicant found that at least the following problems exist: the Type-A plug end of current scheme does not have the CC signal, can not realize the PD transmission, and when the high pressure fills the system soon, because power cord VBUS's voltage can be boosted, CC signal voltage also can be lifted, probably causes the device work of connecting the CC signal in the equipment unusual even damage.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, the present application provides a conversion circuit and a device for solving or alleviating the problems of parameter matching and transmission between two different types of interfaces.

In one aspect, the present application provides a conversion circuit, in particular, the conversion circuit comprising: the circuit comprises a first resistor, a voltage stabilizing circuit and a universal serial bus. The universal serial bus comprises a power line, a ground line and an identification line, and optionally: the first end of the voltage stabilizing circuit is connected with the first end of the first resistor, the second end of the voltage stabilizing circuit is connected with the grounding wire, the third end of the voltage stabilizing circuit is connected with the power wire, and the second end of the first resistor is connected with the identification wire.

Optionally, the voltage stabilizing circuit includes a zener diode and a current limiting resistor, an anode of the zener diode is connected to the ground line, a cathode of the zener diode is connected to a first end of the first resistor and a first end of the current limiting resistor, and a second end of the current limiting resistor is connected to the power line.

Optionally, the voltage stabilizing circuit in the conversion circuit includes a first switch element and a control unit, a first end of the first switch element is connected to the power line, a second end of the first switch element is connected to a first end of the first resistor, a control end of the first switch element is connected to a first end of the control unit, a second end of the control unit is connected to the ground line, and a third end of the control unit is connected to the first end of the first resistor.

Optionally, the voltage stabilizing circuit in the conversion circuit includes a second switch element and a control unit, a first end of the second switch element is connected to the first end of the first resistor, a second end of the second switch element is connected to the ground line, a control end of the second switch element is connected to the first end of the control unit, a second end of the control unit is connected to the ground line, and a third end of the control unit is connected to the first end of the first resistor.

Optionally, the control unit in the conversion circuit includes a second resistor, a third resistor, and a comparator, the second resistor and the third resistor are connected in series between the ground line and a third terminal of the control unit, a first input terminal of the comparator is connected to a common terminal of the second resistor and the third resistor, a second input terminal of the comparator is connected to a reference voltage terminal of the control unit, and an output terminal of the comparator is connected to the first terminal of the control unit.

Optionally, the reference voltage of the reference voltage terminal in the conversion circuit is determined according to the target voltage of the first terminal of the first resistor, the resistance value of the second resistor, and the resistance value of the third resistor.

Optionally, the reference voltage of the reference voltage terminal in the conversion circuit is set according to the following formula:

V＝V1*r3/(r2+r3)

optionally, V is the reference voltage, V1 is a target voltage of the first end of the first resistor, r2 is a resistance value of the second resistor, and r3 is a resistance value of the third resistor.

Optionally, the conversion circuit further includes a fourth resistor, and the first end of the first resistor is connected to the power line through the fourth resistor.

Optionally, the resistance of the first resistor in the conversion circuit is determined according to a target voltage at the first end of the first resistor, a working current provided by the first resistor, and a resistance of a standard pull-down resistor at the interface end of the identification line.

Optionally, the first resistance in the conversion circuit is set according to the following formula:

r1＝V1/A-rd

optionally, r1 is a resistance value of the first resistor, V1 is a target voltage at the first end of the first resistor, a is an operating current provided by the first resistor, and rd is a resistance value of a standard pull-down resistor at the interface end of the identification line.

In another aspect, the present application further provides a conversion device, optionally, the conversion device includes at least two plugs and the conversion circuit as described above, and the at least two plugs are connected through the conversion circuit.

Optionally, the at least two plugs in the conversion device comprise a Type-a plug and a Type-C plug.

As described above, the conversion circuit and the conversion device provided by the application can realize parameter matching and data transmission between two interfaces of different types, and can ensure that the voltage on the identification line does not exceed the safety threshold value through the voltage stabilizing circuit, thereby effectively ensuring the safety of devices, not only supporting the matching between the interfaces, but also having lower cost.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a circuit diagram of a conversion circuit according to an embodiment of the present application;

FIG. 2 is a circuit diagram of a conversion circuit according to the embodiment of FIG. 1;

FIG. 3 is a circuit diagram of a conversion circuit according to another embodiment of the present application;

FIG. 4 is a circuit diagram of a conversion circuit according to the embodiment of FIG. 3;

FIG. 5 is a circuit diagram of a conversion circuit according to another embodiment of the present application;

FIG. 6 is a circuit diagram of the conversion circuit according to the embodiment of the present application and FIG. 5;

fig. 7 is a schematic structural diagram of a conversion device according to an embodiment of the present application.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings. With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element, and optionally, identically named components, features, and elements in different embodiments of the present application may have different meanings, as may be determined by their interpretation in the embodiment or by their further context within the embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or," "and/or," "including at least one of the following," and the like, as used herein, are to be construed as inclusive or mean any one or any combination. For example, "includes at least one of: A. b, C "means" any of the following: a; b; c; a and B; a and C; b and C; a and B and C ", again for example," A, B or C "or" A, B and/or C "means" any of the following: a; b; c; a and B; a and C; b and C; a and B and C'. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.

The mobile terminal may be implemented in various forms. For example, the mobile terminal described in the present application may include mobile terminals such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like, and fixed terminals such as a Digital TV, a desktop computer, and the like.

The following description will be given taking a mobile terminal as an example, and it will be understood by those skilled in the art that the configuration according to the embodiment of the present application can be applied to a fixed type terminal in addition to elements particularly used for mobile purposes.

First embodiment

In the PD transmission problem in Type-A commentaries on classics Type-C data line, current scheme Type-A mouth adopts the 4pin Type-A plug that does not take the CC signal directly to be connected with Type-C USB plug, passes through pull-up resistance pull up to power cord VBUS to a CC signal of Type-C plug. This scheme Type-A plug end does not have the CC signal, can not realize the PD transmission, and when the high pressure fills the system soon, because power cord VBUS's voltage can be boosted, CC signal voltage also can be lifted, probably causes the device work of connecting the CC signal in the equipment unusual even damage. Or the A port adopts a 5pin Type-A plug with a CC signal, a single-pole double-throw switch and a control module are arranged in the USB data line, a CC1 signal in a default state of the Type-C plug is connected to a pull-up resistor, and the pull-up resistor is connected to a power line VBUS. When the data line is plugged into a specific power adapter, the power adapter communicates with the control module, and the control module switches the single-pole double-throw switch to the CC of the Type-A port, so that the CC1 of the Type-C plug is connected with the CC of the Type-A plug, and PD protocol transmission is realized. However, the scheme has high cost, can only communicate with a special power adapter, and has low universality.

Fig. 1 is a circuit schematic diagram of a conversion circuit according to an embodiment of the present application.

Referring to fig. 1, in an embodiment, a conversion circuit includes: a first resistor R1, a voltage regulator circuit 11 and a universal serial bus. Those skilled in the art will appreciate that the conversion circuit configuration shown in fig. 1 does not constitute a limitation of the conversion circuit, and that the conversion circuit may include more or less components than those shown, or combine certain components, or a different arrangement of components.

The following describes the components and operation of the converter circuit in detail with reference to fig. 1:

as shown in fig. 1, in one embodiment, the universal serial bus may include a power line, a ground line, and an identification line.

Referring to fig. 1, a first terminal of the regulator 11 is connected to a first terminal of the first resistor R1, and a second terminal of the regulator 11 is connected to the ground line. The third terminal of the voltage stabilizing circuit 11 is connected to the power line, and the second terminal of the first resistor R1 is connected to the identification line.

In this embodiment, the voltage on the identification line can be ensured not to exceed the safety threshold value through the matching connection of the first resistor R1, the voltage stabilizing circuit 11 and the universal serial bus, so that the device safety is effectively guaranteed, and the device can not only support, but also has low cost.

In one embodiment, communication lines in a CC line or other bus in a line, such as a USB line, a universal serial bus such as a connection bus between a Type-A USB plug and a Type-C USB plug, or other communication bus with communication lines are identified.

Fig. 2 is a circuit connection diagram of the conversion circuit according to the embodiment of fig. 1.

Referring to fig. 2, in an embodiment, the voltage stabilizing circuit 11 in the conversion circuit includes a zener diode D1 and a current limiting resistor R5.

Optionally, the anode of the zener diode D1 is connected to the ground line, the cathode of the zener diode D1 is connected to both the first terminal of the first resistor R1 and the first terminal of the current limiting resistor R5, and the second terminal of the current limiting resistor R5 is connected to the power line.

In this embodiment, when the power voltage rises, the zener diode D1 can keep the voltage across the first resistor R1 substantially constant under the current limiting of the current limiting resistor R5. In other embodiments, the current limiting resistor may also be connected in series with the zener diode D1.

Second embodiment

Fig. 3 is a circuit diagram of a conversion circuit according to another embodiment of the present application, and referring to fig. 3, in an embodiment, a voltage stabilizing circuit 11 in the conversion circuit includes a first switching element Q1 and a control unit 111.

Optionally, a first terminal of the first switching device Q1 is connected to the power line, a second terminal of the first switching device Q1 is connected to a first terminal of the first resistor R1, a control terminal of the first switching device Q1 is connected to a first terminal of the control unit 111, a second terminal of the control unit 111 is connected to the ground line, and a third terminal of the control unit 111 is connected to a first terminal of the first resistor R1.

In the present embodiment, the first switch element Q1 and the control unit 111 form a series-type voltage stabilizing circuit to maintain the voltage across the first resistor R1 stable. The control unit 11 controls the on/off of the first switching element Q1 to realize PD transmission. Some voltage control chips (e.g., TLV760) may control the first switching element Q1 directly by setting a reference voltage. To avoid voltage ripple interference of the series regulator circuit, a filter capacitor may be disposed at least at one end of the first switching device Q1.

Alternatively, referring to fig. 4, fig. 4 is a circuit connection schematic diagram of the conversion circuit according to the embodiment of fig. 3 of the present application. The control unit 111 in the conversion circuit includes a second resistor R2, a third resistor R3, and a comparator T1.

Alternatively, the second resistor R2 and the third resistor R3 are sequentially connected in series between the ground line and the first end of the first resistor R1, the first input end of the comparator T1 is connected to the common end of the second resistor R2 and the third resistor R3, the second input end of the comparator T1 is connected to the reference voltage terminal Vr to input the reference voltage, and the output end of the comparator T1 is connected to the control end of the first switching element Q1. In the present embodiment, the first switching device Q1 is a low-level conducting switching device.

Optionally, the reference voltage of the reference voltage terminal is determined according to the target voltage of the first terminal of the first resistor, the resistance value of the second resistor, and the resistance value of the third resistor. Alternatively, the reference voltage of the reference voltage terminal Vr may be set according to the following formula (1):

V＝V1*r3/(r2+r3) (1)

optionally, V is a reference voltage, V1 is a target voltage of the first end of the first resistor R1, R2 is a resistance value of the second resistor R2, and R3 is a resistance value of the third resistor R3.

In the present embodiment, the comparator T1 controls the on/off of the first switching element Q1 by comparing the voltage at the common terminal of the second resistor R2 and the third resistor R3 with the voltage at the reference voltage terminal Vr, thereby achieving the purpose of voltage stabilization.

In an integrated circuit, the reference voltage of the operational amplifier is typically generated using a bandgap voltage reference, which may be set to 1.25V or 2.5V. In the present embodiment, the reference voltage of the reference voltage terminal Vr in the conversion circuit is 2.5V. Therefore, by setting the ratio of the second resistor R2 and the third resistor R3, the comparator T1 can control the first end of the first resistor R1 to maintain a proper voltage by controlling the on/off of the first switch Q1.

Alternatively, in a switching circuit, the target voltage at the first end of the first resistor R1 needs to be maintained at about 3.3V. Alternatively, the second resistor R2 is configured to have a resistance of 80k ohms, the third resistor R3 is configured to have a resistance of 250k ohms, and the voltage output from the common terminal of the second resistor R2 and the third resistor R3 should be maintained at 3.3 × 250/(80+250), i.e., 2.5V. Alternatively, the reference voltage of the comparator T1 is set to 2.5V. When the voltage output by the common terminal of the second resistor R2 and the third resistor R3 is higher than 2.5V, which indicates that the voltage of the first terminal of the first resistor R1 is higher than 3.3V, the comparator T1 outputs a high level, the first switch Q1 is turned off, and the first terminal of the first resistor R1 is turned off from the power line for a short time.

Optionally, when the voltage at the first end of the first resistor R1 is pulled down to be lower than 3.3V, due to the ratio of the resistances of the second resistor R2 and the third resistor R3, at this time, the voltage output by the common end of the second resistor R2 and the third resistor R3 is lower than 2.5V, and the comparator T1 also outputs a low level, so as to turn on the first switch Q1 and turn on the power line again, so that the voltage at the first end of the first resistor R1 is raised back to 3.3V. Through the cyclic control, the comparator T1 can control the first end of the first resistor R1 to maintain the required 3.3V voltage.

In this embodiment, since the interface end identification line of the conversion circuit is connected to a standard pull-down resistor (not shown in the figure), the resistance of the first resistor is determined according to the target voltage at the first end of the first resistor, the working current provided by the first resistor, and the resistance of the standard pull-down resistor at the interface end of the identification line.

Alternatively, when determining the resistance value of the first resistor R1, the setting may be made according to the following equation (2):

r1＝V1/A-rd (2)

optionally, R1 is a resistance value of the first resistor R1, V1 is a target voltage at the first end of the first resistor R1, a is an operating current required to be provided by the first resistor R1, and rd is a resistance value of a standard pull-down resistor of the interface terminal identification line of the conversion circuit.

Alternatively, in the Type-a to Type-C conversion circuit, the first resistor R1 is required to provide an operating current of 80uA, the target voltage at the first end of the first resistor R1 is 3.3V, and the resistance of the standard pull-down resistor of the identification line is 5.1k ohms. According to the above formula, the first resistor R1 has a resistance value of 3.3/0.08-5.1, which is about 36k ohms.

In this embodiment, the on-off control of the first switching element Q1 by the control unit 111 can ensure that the voltage across the first resistor R1 is configured at a proper voltage value, thereby ensuring that the PD communication on the identification line can be performed normally.

Third embodiment

Fig. 5 is a circuit diagram of a conversion circuit according to another embodiment of the present application, and as shown in fig. 5, in one embodiment, a voltage stabilizing circuit 11 in the conversion circuit includes a second switching element Q2 and a control unit 111.

Optionally, a first terminal of the second switch Q2 is connected to the first terminal of the first resistor R1, a second terminal of the second switch Q2 is connected to the ground line, a control terminal of the second switch Q2 is connected to the first terminal of the control unit 111, the second terminal of the control unit 111 is connected to the ground line, and a third terminal of the control unit 111 is connected to the first terminal of the first resistor R1.

In the present embodiment, the second switch element Q2 and the control unit 111 form a shunt-type voltage stabilizing circuit to maintain the voltage across the first resistor R1 stable. The control unit 111 controls the on/off of the second switching element Q2 to realize PD transmission. When the control unit 111 detects that the voltage at the first end of the first resistor R1 exceeds the threshold, the second switch Q2 is immediately controlled to be turned on, and the voltage on the identification line is pulled down in time.

Fig. 6 is a circuit connection diagram of the conversion circuit according to the embodiment of fig. 5, and as shown in fig. 6, in an embodiment, the control unit 111 in the conversion circuit includes a second resistor R2, a third resistor R3, and a comparator T2.

Alternatively, the second resistor R2 and the third resistor R3 are sequentially connected in series between the ground line and the first end of the first resistor R1, the first input end of the comparator T2 is connected to the common end of the second resistor R2 and the third resistor R3, the second input end of the comparator T1 is connected to the reference voltage terminal Vr to input the reference voltage, and the output end of the comparator T1 is connected to the control terminal of the second switching element Q2. In the present embodiment, the second switching device Q2 is a switching device that is turned on at a high level.

In the present embodiment, the comparator T1 controls the on/off of the second switching element Q2 by comparing the voltage at the common terminal of the second resistor R2 and the third resistor R3 with the voltage at the reference voltage terminal Vr, thereby achieving the purpose of voltage stabilization.

In integrated circuits, the reference voltage for the operational amplifier is typically generated using a bandgap voltage reference, which is typically set to 1.25V. In one embodiment, the reference voltage of the reference voltage terminal Vr in the conversion circuit is 2.5V. Alternatively, by setting the ratio of the second resistor R2 and the third resistor R3, the comparator T1 can control the first end of the first resistor R1 to maintain a proper voltage by controlling the on/off of the second switch Q2.

In this embodiment, the target voltage at the first end of the first resistor R1 needs to be maintained at about 3.3V. Alternatively, the second resistor R2 is configured to have a resistance of 80k ohms, the third resistor R3 is configured to have a resistance of 250k ohms, and the voltage output from the common terminal of the second resistor R2 and the third resistor R3 should be maintained at 3.3 × 250/(80+250), i.e., 2.5V. Alternatively, the reference voltage of the comparator T1 is set to 2.5V.

Alternatively, when the voltage output by the common terminal of the second resistor R2 and the third resistor R3 is higher than 2.5V, which indicates that the voltage of the first terminal of the first resistor R1 is higher than 3.3V, the comparator T1 outputs a high level at this time, the second switch Q2 is turned on, and the voltage of the first terminal of the first resistor R1 is drained to ground for a short time.

Optionally, when the voltage at the first end of the first resistor R1 is pulled down to be lower than 3.3V, due to the ratio of the resistances of the second resistor R2 and the third resistor R3, at this time, the voltage output by the common end of the second resistor R2 and the third resistor R3 is lower than 2.5V, and the comparator T1 also outputs a low level, so that the second switch Q2 is turned off, so that the voltage at the first end of the first resistor R1 is raised back to 3.3V. Through the cyclic control, the comparator T1 can control the first end of the first resistor R1 to maintain the required 3.3V voltage.

Alternatively, in the Type-a to Type-C conversion circuit, the first resistor R1 is required to provide an operating current of 80uA, the target voltage at the first end of the first resistor R1 is 3.3V, and the resistance of the standard pull-down resistor of the identification line is 5.1k ohms. Alternatively, the first resistor R1 has a resistance of 3.3/0.08-5.1, about 36k ohms.

In this embodiment, the on-off control of the second switch device Q2 by the control unit 111 can ensure that the voltage across the first resistor R1 is configured at a proper voltage value, thereby ensuring that the PD communication on the identification line can be performed normally.

In an embodiment, the conversion circuit further includes a fourth resistor R4, and the first end of the first resistor R1 is connected to the power line through the fourth resistor R4. Optionally, the fourth resistor R4 is used as a voltage dividing and current limiting device to avoid other devices in the series circuit from being damaged by high voltage or current. Optionally, the fourth resistor R4 is configured to be 20k ohms or 10k ohms.

Fourth embodiment

The embodiment of the present application further provides a conversion device, where the conversion device includes at least two plugs and the conversion circuit disclosed in the above embodiment, and the at least two plugs are connected through the conversion circuit. Optionally, the at least two plugs comprise Type-a plugs, Type-C plugs.

Alternatively, fig. 7 is a schematic structural diagram of a conversion device according to an embodiment of the present application, and referring to fig. 7, in an embodiment, the conversion device may include a first plug 20, a second plug 30 and a conversion circuit 10 as in the above embodiments, and the first plug 20 and the second plug 30 are connected to each other through the conversion circuit 10.

Optionally, the first plug 20 in the conversion device is a Type-a plug and the second plug 30 is a Type-C plug.

According to the embodiment, the voltage stabilizing circuit in the conversion device can ensure stable voltage on a CC line in a Type-A to Type-C data line, and interface devices at two ends of a universal serial bus in USB communication are matched to ensure the PD transmission problem at two ends. When the conversion device realizes data conversion among a plurality of plugs, the related technical details are the same as those of the above embodiment, and are not described herein again.

It should be noted that, in the above embodiments, the present application does not limit the type of the switch member. The switching device may be selected from various switching devices such as MOS transistors, diodes, relays, and switching chips.

As described above, the conversion circuit and the conversion device provided by the application can realize parameter matching and data transmission between two interfaces of different types, and can ensure that the voltage on the identification line does not exceed the safety threshold value through the voltage stabilizing circuit, thereby effectively ensuring the safety of devices, not only supporting the matching between the interfaces, but also having lower cost.

The specific structure of the conversion circuit in this embodiment refers to the above embodiments, and since the conversion circuit can adopt any technical solution of any of the above embodiments, the content of the expansion and explanation of the specification is basically the same as that of each of the above embodiments, and is not described in detail here.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

The units in the device in the embodiment of the application can be merged, divided and deleted according to actual needs.

In the present application, the same or similar term concepts, technical solutions and/or application scenario descriptions will be generally described only in detail at the first occurrence, and when the description is repeated later, the detailed description will not be repeated in general for brevity, and when understanding the technical solutions and the like of the present application, reference may be made to the related detailed description before the description for the same or similar term concepts, technical solutions and/or application scenario descriptions and the like which are not described in detail later.

In the present application, each embodiment is described with emphasis, and reference may be made to the description of other embodiments for parts that are not described or illustrated in any embodiment.

The technical features of the technical solution of the present application may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features in the embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present application should be considered as being described in the present application.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method of each embodiment of the present application.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, memory Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.

Claims (10)

1. The conversion circuit is characterized by comprising a first resistor, a voltage stabilizing circuit, a power line, a grounding line and an identification line, wherein:

the first end of the voltage stabilizing circuit is connected with the first end of the first resistor, the second end of the voltage stabilizing circuit is connected with the grounding wire, the third end of the voltage stabilizing circuit is connected with the power wire, and the second end of the first resistor is connected with the identification wire.

2. The conversion circuit of claim 1, wherein the regulator circuit comprises a zener diode and a current limiting resistor, wherein an anode of the zener diode is connected to the ground line, a cathode of the zener diode is connected to a first terminal of the first resistor and a first terminal of the current limiting resistor, and a second terminal of the current limiting resistor is connected to the power line.

3. The conversion circuit of claim 1, wherein the voltage regulator circuit comprises a first switch element and a control unit, a first terminal of the first switch element is connected to the power line, a second terminal of the first switch element is connected to a first terminal of the first resistor, a control terminal of the first switch element is connected to a first terminal of the control unit, a second terminal of the control unit is connected to the ground line, and a third terminal of the control unit is connected to the first terminal of the first resistor.

4. The switching circuit of claim 1, wherein the voltage regulator circuit includes a second switching element and a control unit, a first terminal of the second switching element is connected to the first terminal of the first resistor, a second terminal of the second switching element is connected to the ground line, a control terminal of the second switching element is connected to the first terminal of the control unit, a second terminal of the control unit is connected to the ground line, and a third terminal of the control unit is connected to the first terminal of the first resistor.

5. The conversion circuit according to claim 3 or 4, wherein the control unit comprises a second resistor, a third resistor and a comparator, the second resistor and the third resistor are connected in series between the ground line and a third terminal of the control unit, a first input terminal of the comparator is connected to a common terminal of the second resistor and the third resistor, a second input terminal of the comparator is connected to a reference voltage terminal of the control unit, and an output terminal of the comparator is connected to the first terminal of the control unit.

6. The conversion circuit according to claim 5, wherein the reference voltage of the reference voltage terminal is determined according to a target voltage of the first terminal of the first resistor, a resistance value of the second resistor, and a resistance value of the third resistor.

7. The conversion circuit according to any one of claims 1 to 4, further comprising a fourth resistor, wherein a first terminal of the first resistor is connected to the power supply line through the fourth resistor.

8. The conversion circuit according to any one of claims 1 to 4, wherein the resistance of the first resistor is determined according to a target voltage at the first end of the first resistor, an operating current provided by the first resistor, and a resistance of a standard pull-down resistor at the interface end of the identification line.

9. A switching device, comprising at least two plugs and a switching circuit according to any one of claims 1 to 8, the at least two plugs being connected by the switching circuit.

10. The switching device of claim 9, wherein the at least two plugs comprise a Type-a plug, a Type-C plug.

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