CN219626011U - Interface conversion circuit - Google Patents

Abstract

The embodiment of the utility model discloses an interface conversion circuit, and relates to the field of signal conversion. In the interface conversion circuit, a TYPE-A interface sub-circuit sends a universal serial bus signal to a signal protection sub-circuit to provide voltage to a voltage protection sub-circuit; the voltage protection sub-circuit converts the voltage into a stable voltage to provide voltage stabilization for other sub-circuits; the signal protection sub-circuit receives the signal and performs filtering processing, converts the 3.0 signal into a TYPE-C signal, sends the 2.0 signal to the TYPE-C interface sub-circuit, and sends the TYPE-C signal to the electromagnetic compatibility sub-circuit; the electromagnetic compatibility sub-circuit receives and processes the TYPE-C signal and sends the TYPE-C signal to the TYPE-C interface sub-circuit; the TYPE-C interface sub-circuit outputs a 2.0 signal and a TYPE-C signal. Based on this, the external device can normally receive and transmit the USB signal under the severe environment.

Description

Interface conversion circuit

Technical Field

The present utility model relates to the field of signal conversion, and in particular, to an interface conversion circuit.

Background

In high altitude or other severe working environments, electromagnetic energy interference caused by other factors such as lightning stroke exists, and therefore output of a TYPE-C interface in an industrial control computer is affected, such as a video acquisition missing condition of a video acquisition device working based on the TYPE-C interface.

Therefore, how to ensure smooth operation of the TYPE-C interface in a severe working environment is one of the problems to be solved at present.

Disclosure of Invention

In view of the above, the present utility model provides an interface conversion circuit for solving the problem of ensuring that the TYPE-C interface can operate smoothly in a severe operating environment.

In a first aspect, an embodiment of the present utility model provides an interface conversion circuit, including a TYPE-a interface sub-circuit, a voltage protection sub-circuit, a signal protection sub-circuit, an electromagnetic compatibility sub-circuit, and a TYPE-C interface sub-circuit;

the TYPE-A interface sub-circuit is electrically connected with the voltage protection sub-circuit and the signal protection sub-circuit respectively, the signal protection sub-circuit is electrically connected with the electromagnetic compatibility sub-circuit and the TYPE-C interface sub-circuit respectively, and the electromagnetic compatibility sub-circuit is electrically connected with the TYPE-C interface sub-circuit;

the TYPE-A interface sub-circuit is used for sending the received universal serial bus signal to the signal protection sub-circuit and providing preset voltage for the voltage protection sub-circuit, wherein the universal serial bus signal comprises a universal serial bus 2.0 signal and a universal serial bus 3.0 signal;

the voltage protection sub-circuit is used for converting the preset voltage into a stable voltage and providing the stable voltage for other sub-circuits;

the signal protection sub-circuit is used for receiving the universal serial bus signal, filtering the universal serial bus signal, converting a 3.0 signal of the universal serial bus signal after the filtering into a TYPE-C signal, sending the 2.0 signal of the universal serial bus after the filtering to the TYPE-C interface sub-circuit, and sending the TYPE-C signal to the electromagnetic compatibility sub-circuit;

the electromagnetic compatibility sub-circuit is used for receiving the TYPE-C signal, performing electromagnetic interference protection processing on the TYPE-C signal, and sending the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit;

the TYPE-C interface sub-circuit is used for receiving the filtered universal serial bus 2.0 signal and the protected TYPE-C signal and outputting the filtered universal serial bus 2.0 signal and the protected TYPE-C signal to external equipment.

Optionally, in an implementation manner provided by the embodiment of the present utility model, the voltage protection subcircuit includes a non-parasitic body diode MOS, an input end of the non-parasitic body diode MOS is electrically connected to the TYPE-a interface subcircuit, an output end of the non-parasitic body diode MOS is electrically connected to other subcircuits, and the non-parasitic body diode MOS is configured to convert an input preset voltage into a stable voltage for outputting.

Optionally, in an implementation manner provided by the embodiment of the present utility model, the voltage protection sub-circuit further includes a capacitor and a fuse;

the input end of the parasitic-free body diode MOS tube is electrically connected with the capacitor, and the output end of the parasitic-free body diode MOS tube is electrically connected with the other sub-circuits through the fuse.

Optionally, in an implementation manner provided by the embodiment of the present utility model, the signal protection sub-circuit includes a first common-mode inductor, a second common-mode inductor, a third common-mode inductor, a universal serial bus signal multiplexer, and a channel selection unit;

the first common-mode inductor and the second common-mode inductor are used for receiving the universal serial bus 3.0 signal, filtering the universal serial bus 3.0 signal, and sending the filtered universal serial bus 3.0 signal to the universal serial bus signal multiplexer;

the third common mode inductor is used for receiving the universal serial bus 2.0 signal, performing filtering processing on the universal serial bus 2.0 signal, and sending the filtered universal serial bus 2.0 signal to the TYPE-C interface sub-circuit;

the channel selection unit is used for generating a corresponding enabling signal according to the received TPYC-C interface insertion detection signal and sending the enabling signal to the universal serial bus signal multiplexer;

the universal serial bus signal multiplexer is used for generating the TYPE-C signal and sending the TYPE-C signal to the electromagnetic compatibility sub-circuit when the enabling signal and the filtered universal serial bus 3.0 signal are received.

Optionally, in an implementation manner provided by an embodiment of the present utility model, the TPYC-C interface insertion detection signal includes an uninserted signal and an inserted signal, the enable signal includes a first enable signal and a second enable signal, and the universal serial bus signal multiplexer includes a first channel and a second channel;

the channel selection unit is further configured to generate a first enable signal when the non-inserted signal is received and send the first enable signal to a universal serial bus signal multiplexer, and to generate a second enable signal when the inserted signal is received and send the second enable signal to the universal serial bus signal multiplexer;

the universal serial bus signal multiplexer is further configured to generate a TYPE-C signal when the first enable signal and the filtered universal serial bus signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit based on the first channel, and generate the TYPE-C signal when the second enable signal and the filtered universal serial bus signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit based on the second channel.

Optionally, in an implementation manner provided by the embodiment of the present utility model, the non-inserted signal is a voltage with a voltage magnitude being a first preset value or a second preset value, the inserted signal is a voltage with a voltage magnitude being in a preset interval, a lower interval limit of the preset interval is greater than the first preset value, and an upper interval limit of the preset interval is less than the second preset value.

Optionally, in an implementation manner provided by an embodiment of the present utility model, the usb signal multiplexer is a dual-channel differential usb 3.1 multiplexer.

Optionally, in an implementation manner provided by an embodiment of the present utility model, the electromagnetic compatibility sub-circuit includes a first electrostatic discharge diode and a second electrostatic discharge diode;

the first electrostatic discharge diode and the second electrostatic discharge diode are both used for receiving the TYPE-C signal, performing electromagnetic interference protection processing on the TYPE-C signal, and sending the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit.

Optionally, in an implementation manner provided by the embodiment of the present utility model, the first electrostatic discharge diode and the second electrostatic discharge diode are both IEC 61000-4-2 electrostatic diodes.

Optionally, in an implementation manner provided in the embodiment of the present utility model, the preset voltage is 5V.

In the interface conversion circuit provided by the utility model, a TYPE-A interface sub-circuit sends a received universal serial bus signal to a signal protection sub-circuit, and provides preset voltage for the voltage protection sub-circuit, wherein the universal serial bus signal comprises a universal serial bus 2.0 signal and a universal serial bus 3.0 signal; the voltage protection sub-circuit converts the preset voltage into a stable voltage and provides the stable voltage for other sub-circuits; the signal protection sub-circuit receives the universal serial bus signal, performs filtering processing on the universal serial bus signal, converts the 3.0 signal of the universal serial bus signal after the filtering processing into a TYPE-C signal, sends the 2.0 signal of the universal serial bus after the filtering processing to the TYPE-C interface sub-circuit, and sends the TYPE-C signal to the electromagnetic compatibility sub-circuit; the electromagnetic compatibility sub-circuit receives the TYPE-C signal, performs electromagnetic interference protection processing on the TYPE-C signal, and sends the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit; the TYPE-C interface sub-circuit receives the filtered universal serial bus 2.0 signal and the protected TYPE-C signal, and outputs the filtered universal serial bus 2.0 signal and the protected TYPE-C signal to an external device. Based on the method, the external equipment can normally receive and transmit the USB signal when being disturbed by lightning strokes outdoors or being carried by static electricity carried by indoor dry human bodies, so that the normal operation under the severe environment is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of a first interface conversion circuit according to an embodiment of the present utility model;

FIG. 2 shows a schematic diagram of the TYPE-A interface sub-circuit provided by the utility model;

fig. 3 is a schematic diagram of a voltage protection sub-circuit according to an embodiment of the present utility model;

fig. 4a shows a schematic structural diagram of a USB3.0 signal processing portion in a signal protection sub-circuit according to an embodiment of the present utility model;

fig. 4b shows a schematic structural diagram of a USB2.0 signal processing portion in a signal protection sub-circuit according to an embodiment of the present utility model;

fig. 5 shows a schematic structural diagram of an electromagnetic compatibility sub-circuit according to an embodiment of the present utility model;

FIG. 6 shows a schematic diagram of a TYPE-C interface sub-circuit according to an embodiment of the present utility model;

fig. 7 is a schematic diagram showing a structure of a channel selecting unit in a signal protection sub-circuit according to an embodiment of the present utility model.

Description of main reference numerals:

100-interface conversion circuit, 110-TYPE-A interface sub-circuit, 120-voltage protection sub-circuit, 121-parasitic free body diode MOS transistor, 122-capacitor, 123-fuse, 130-signal protection sub-circuit, 131-first common mode inductance, 132-second common mode inductance, 133-third common mode inductance, 134-universal serial bus signal multiplexer. 135-first diode, 136-second diode, 140-electromagnetic compatibility subcircuit, 141-first electrostatic discharge diode, 142-second electrostatic discharge diode, 150-TYPE-C interface subcircuit.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

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 utility model belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a first interface conversion circuit provided in an embodiment of the present utility model, and an interface conversion circuit 100 provided in an embodiment of the present utility model includes a TYPE-a interface sub-circuit 110, a voltage protection sub-circuit 120, a signal protection sub-circuit 130, an electromagnetic compatibility sub-circuit 140, and a TYPE-C interface sub-circuit 150;

the TYPE-A interface sub-circuit 110 is electrically connected with the voltage protection sub-circuit 120 and the signal protection sub-circuit 130 respectively, the signal protection sub-circuit 130 is electrically connected with the electromagnetic compatibility sub-circuit 140 and the TYPE-C interface sub-circuit respectively, and the electromagnetic compatibility sub-circuit 140 is electrically connected with the TYPE-C interface sub-circuit;

the TYPE-a interface sub-circuit 110 is configured to send a received universal serial bus signal to the signal protection sub-circuit 130, and to provide a preset voltage to the voltage protection sub-circuit 120, where the universal serial bus signal includes a universal serial bus 2.0 signal and a universal serial bus 3.0 signal;

the voltage protection sub-circuit 120 is configured to convert the preset voltage into a stable voltage, and provide the stable voltage for other sub-circuits;

the signal protection sub-circuit 130 is configured to receive the usb signal, perform filtering processing on the usb signal, convert the filtered usb signal 3.0 into a TYPE-C signal, send the filtered usb signal 2.0 to the TYPE-C interface sub-circuit, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit 140;

the electromagnetic compatibility sub-circuit 140 is configured to receive the TYPE-C signal, perform electromagnetic interference protection processing on the TYPE-C signal, and send the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit;

the TYPE-C interface sub-circuit 150 is configured to receive the filtered usb2.0 signal and the guard-processed TYPE-C signal, and output the filtered usb2.0 signal and the guard-processed TYPE-C signal to an external device.

It should be noted that, in the interface conversion circuit 100 provided in the embodiment of the present utility model, after the TYPE-a interface is inserted into the USB (Universal Serial Bus ) signal generating device, the TYPE-a interface sub-circuit 110 sends the signal generated by the USB signal generating device to the signal protection sub-circuit 130, and meanwhile, the TYPE-a interface sub-circuit 110 also provides a preset voltage to supply power to devices (such as a motherboard or a capacitor) in each sub-circuit in the interface conversion circuit 100.

Optionally, in one possible manner provided by the present utility model, the preset voltage provided by TYPE-a interface sub-circuit 110 is 5V.

It can be understood that the specific configuration of the TYPE-a interface sub-circuit 110 according to the embodiment of the present utility model may be set according to the actual situation, for example, in one example, the configuration of the TYPE-a interface sub-circuit 110 is shown in fig. 2, and fig. 2 shows a schematic structural diagram of the TYPE-a interface sub-circuit 110 provided by the present utility model. The +5v voltage output from pin 1 in fig. 2 is the preset voltage, and the signals output from pins 9, 8, 2, 3, 6 and 5 are the USB signals. It will be understood that the USB3.0 tx_dp signal, the USB3.0 tx_dn signal, the USB3.0 rx_dp signal, and the USB3.0 rx_dn signal output by pins 9, 8, 6, and 5 respectively are USB3.0 signals, and the USB2.0_n signal and the USB2.0_p signal output by pins 2 and 3 respectively are USB2.0 signals.

Further, since the voltage provided by the TYPE-a interface sub-circuit 110 is directly obtained from the outside, abnormal power supply states such as too low voltage or too high current may exist, and thus the voltage protection sub-circuit 120 is introduced in the embodiment of the present utility model, so that the voltage output by the TYPE-a interface sub-circuit 110 is maintained within the normal value range. That is, the voltage provided by TYPE-a interface sub-circuit 110 will first pass through voltage protection sub-circuit 120, and voltage protection sub-circuit 120 will be based on various devices inside, so that the passed voltage can be stably output, thereby ensuring that other sub-circuits (i.e., signal protection sub-circuit 130, electromagnetic compatibility sub-circuit 140, and TYPE-C interface sub-circuit 150) can complete operation with a stable voltage.

It can be understood that the specific configuration manner of the voltage protection sub-circuit 120 in the embodiment of the present utility model is what can be set according to practical situations, for example, in a possible manner, please refer to fig. 3, a schematic structural diagram of the voltage protection sub-circuit 120 provided in the embodiment of the present utility model is shown, in this possible manner, the voltage protection sub-circuit 120 includes a parasitic-free body diode MOS transistor 121, an input end of the parasitic-free body diode MOS transistor 121 is electrically connected to the TYPE-a interface sub-circuit 110, an output end of the parasitic-free body diode MOS transistor 121 is electrically connected to other sub-circuits, and the parasitic-free body diode MOS transistor 121 is used for converting an input preset voltage into a stable voltage for outputting.

That is, the embodiment of the present utility model introduces the parasitic free body diode MOS transistor 121, so that when the voltage provided by the TYPE-a interface sub-circuit 110 is in an abnormal power supply state such as too low voltage or too high current, the voltage output is stopped, so as to avoid the device of other sub-circuits from being failed due to abnormal voltage. It can be appreciated that the parasitic free body diode MOS transistor 121 has functions of soft start, current limiting protection, power-on reset, over-temperature protection, and the like, and can effectively perform voltage/power protection.

As shown in fig. 3, the input terminal (VIN terminal) of the parasitic-free body diode MOS transistor 121 receives a voltage input of +5v (i.e., receives a preset voltage input by the TYPE-a interface sub-circuit 110), and the output terminal (OUT terminal) of the parasitic-free body diode MOS transistor 121 outputs a stable voltage vcc_usb1.

It should be understood that, when the preset voltage input by the TYPE-a interface sub-circuit 110 gradually decreases from the normal voltage, the parasitic free body diode MOS 121 needs to maintain the stable output voltage, so that the input terminal of the parasitic free body diode MOS 121 is electrically connected to the capacitor 122 in the present utility model, so as to ensure the stable output voltage of the OUT terminal. Meanwhile, in order to avoid unexpected abrupt changes of the voltage output from the OUT terminal, the embodiment of the utility model further introduces a fuse 123, so as to avoid the possibility that each sub-circuit is burned OUT.

After the TYPE-a interface sub-circuit 110 provides a stable voltage to each sub-circuit in the interface conversion circuit 100, the signal protection sub-circuit 130 processes the received USB signals (i.e., the USB3.0 signal and the USB2.0 signal) accordingly to ensure the signal integrity of the USB signals (Signal Integrality, SI). Specifically, TYPE-A interface sub-circuit 110 is to filter the USB signal to attenuate a portion of the common mode interference signal in the USB3.0 signal and the USB2.0 signal. Then, the filtered USB3.0 signal is converted into a TYPE-C signal, and the TYPE-C signal is transmitted to the electromagnetic compatibility sub-circuit 140 for the next process. Meanwhile, the filtered USB2.0 signal is transmitted to the TYPE-C interface sub-circuit 150, so that the TYPE-C interface sub-circuit 150 outputs the filtered USB2.0 signal to an external device.

It can be understood that, in the signal protection sub-circuit 130, the process of processing the USB3.0 signal and the USB2.0 signal is set according to practical situations, and the embodiment of the present utility model only requires that the USB3.0 signal and the USB2.0 signal output by the signal protection sub-circuit 130 can ensure signal integrity.

Optionally, in a possible manner provided by the present utility model, please refer to fig. 4a and fig. 4b, which respectively show a schematic structural diagram of a USB3.0 signal processing portion and a schematic structural diagram of a USB2.0 signal processing portion in the signal protection sub-circuit 130 according to an embodiment of the present utility model. In this way, the signal protection sub-circuit 130 includes a first common-mode inductor 131, a second common-mode inductor 132, a third common-mode inductor 133, a universal serial bus signal multiplexer 134, and a channel selection unit;

the first common-mode inductor 131 and the second common-mode inductor 132 are both configured to receive the 3.0 signal, perform filtering processing on the 3.0 signal, and send the filtered universal serial bus signal 3.0 signal to the universal serial bus signal multiplexer 134;

the third common-mode inductor 133 is configured to receive the 2.0 signal, perform filtering processing on the 2.0 signal, and send the filtered 2.0 signal to the TYPE-C interface sub-circuit 150;

the channel selection unit is configured to generate a corresponding enable signal according to the received TPYC-C interface insertion detection signal, and send the enable signal to the usb signal multiplexer 134;

the usb signal multiplexer 134 is configured to generate the TYPE-C signal and send the TYPE-C signal to the electromagnetic compatibility sub-circuit 140 when receiving the enable signal and the filtered usb signal 3.0 signal.

As shown in fig. 4a, after the USB3.0 signal enters the first common-mode inductor 131 and the second common-mode inductor 132, the first common-mode inductor 131 and the second common-mode inductor 132 perform filtering processing on the received USB3.0 signal, and then the filtered USB3.0 signal is sent to the USB signal multiplexer 134.

It should be noted that the usb signal multiplexer 134 shown in fig. 4a is a dual-channel differential usb 3.1 multiplexer. It can be understood that the dual-channel differential universal serial bus 3.1 multiplexer has a typical bandwidth of 10GHz, a typical insertion loss of-1.0 dB of 2.5GHz and a 2KV HBM ESD protection function, so that the signal integrity of USB3.0 signals can be effectively ensured. It should be further understood that the usb signal multiplexer 134 in the embodiment of the present utility model is a selectable content according to practical situations, and the dual-channel differential usb 3.1 multiplexer is only one possible way.

Further, as shown in fig. 4a, after the USB3.0 signals input by pins 1, 2, 4 and 5 are received by the USB signal multiplexer 134, the USB signal multiplexer 134 determines whether the TYPE-C signal after USB3.0 signal conversion is output from pins 16, 15, 11 and 10 to the electromagnetic compatibility sub-circuit 140 or from pins 14, 13, 9 and 8 to the electromagnetic compatibility sub-circuit 140 based on the enable signal TYPE ec1_sel input by pin 6 (i.e., the enable signal generated by the channel selection unit according to the interface insertion detection signal).

It will be appreciated that pins 16, 15, 11 and 10 correspond to the B-channel and pins 14, 13, 9 and 8 correspond to the C-channel, in other words, the TYPE ec1_sel input to the usb signal multiplexer 134 by the channel selection unit will be used to determine whether the TYPE-C signal will be output from the B-channel or the C-channel. It is contemplated that usb signal multiplexer 134 may not be as configured in fig. 4a, and that its corresponding channel configuration and channel output may be adapted to the actual situation when implemented by other multiplexers.

It is further understood that the channel selection unit in the embodiment of the present utility model is only used to implement the output channel selection of the usb signal multiplexer 134, and the configuration manner is implemented according to the actual situation.

Further, as shown in fig. 4b, the processing of the USB2.0 signal is shown in fig. 4b, that is, the USB2.0 signal is input to the third common-mode inductor 133, and after the third common-mode inductor 133 filters the USB2.0 signal, the filtered USB2.0 signal is sent to the TYPE-C interface sub-circuit 150, so that the TYPE-C interface sub-circuit 150 outputs the USB2.0 signal to an external device.

Therefore, the embodiment of the utility model can attenuate partial common mode interference signals in the USB3.0 signal and the USB2.0 signal, thereby improving the output capacity of the USB signal, ensuring the waveform of the USB signal to be correct and supporting long-distance signal transmission.

It will be appreciated that although the signal protection sub-circuit 130 can ensure signal integrity of the USB signal during transmission, electromagnetic energy interference in a severe operating environment is not yet resolved, so the present utility model is to solve electromagnetic energy interference, and further make the signal protection sub-circuit 130 send the TYPE-C signal to the electromagnetic compatibility sub-circuit 140 before transmitting the TYPE-C signal to the TYPE-C interface sub-circuit 150, so that the electromagnetic compatibility sub-circuit 140 performs electromagnetic interference protection processing on the TYPE-C signal, thereby eliminating electromagnetic energy interference.

It can be appreciated that the manner of eliminating electromagnetic energy interference is set according to practical situations, and as in one possible manner provided in the embodiment of the present utility model, referring specifically to fig. 5, a schematic structural diagram of the electromagnetic compatibility sub-circuit 140 provided in the embodiment of the present utility model is shown. In this possible manner, the electromagnetic compatibility sub-circuit 140 includes a first electrostatic discharge diode 141 and a second electrostatic discharge diode 142;

the first esd diode 141 and the second esd diode 142 are both configured to receive the TYPE-C signal, perform electromagnetic interference protection processing on the TYPE-C signal, and send the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit 150.

As shown in fig. 5, the electromagnetic compatibility sub-circuit 140 in the embodiment of the present utility model includes a first electrostatic discharge diode 141 and a second electrostatic discharge diode 142. The first esd diode 141 and the second esd diode 142 have the capability of protecting against lightning strike and electric fast transient pulse group interference, so that the interface conversion circuit 100 provided by the utility model can be effectively ensured to operate stably and reliably in the severe electromagnetic energy interference environment.

In a preferred form provided by embodiments of the present utility model, the first electrostatic discharge diode 141 and the second electrostatic discharge diode 142 are each IEC 61000-4-2 electrostatic diodes. That is, the first and second electrostatic discharge diodes 141 and 142 are diodes manufactured based on the IEC (International Electrotechnical Commission ) 61000-4-2 standard.

Therefore, when the TYPE-C interface sub-circuit 150 in the embodiment of the utility model transmits the TYPE-C signal and the USB2.0 signal to the external equipment, the external equipment can be ensured to be interfered by lightning stroke outdoors or can normally receive and transmit the USB signal when being subjected to static electricity carried by indoor dry human bodies, thereby realizing normal operation under severe environment.

Further, for a better explanation of the TYPE-C interface sub-circuit 150 provided in the embodiment of the present utility model, please refer to fig. 6, which shows a schematic structural diagram of the TYPE-C interface sub-circuit 150 provided in the embodiment of the present utility model. It should be understood that, as shown in fig. 6, the type_cc1 signal output by pin A5 of the TYPE-C interface sub-circuit 150 represents the access front and back sides of the external TYPE-C device being accessed; pins A8, B8 and NP1 to 4 are not used.

It should be understood that there are a plurality of TYPEs of TYPE-C interface sub-circuits 150 capable of outputting the type_cc1 signal, and thus the TYPE-C interface sub-circuits 150 in the present utility model are capable of being implemented according to actual situations.

Furthermore, it may be understood that the specific process of outputting the TYPE-C signal by the usb signal multiplexer 134 in the embodiment of the present utility model may be set according to practical situations, for example, in one possible manner, the TPYC-C interface insertion detection signal includes an uninserted signal and an inserted signal, the enable signal includes a first enable signal and a second enable signal, and the usb signal multiplexer includes a first channel and a second channel;

the channel selection sub-circuit is further configured to generate a first enable signal upon receipt of the non-inserted signal and to send the first enable signal to the universal serial bus signal multiplexer 134, and to generate a second enable signal upon receipt of the inserted signal and to send the second enable signal to the universal serial bus signal multiplexer 134;

the usb signal multiplexer is further configured to generate a TYPE-C signal when the first enable signal and the filtered usb signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit 140 based on the first channel, and generate the TYPE-C signal when the second enable signal and the filtered usb signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit 140 based on the second channel.

That is, the USB signal multiplexer 134 will complete the output of the TYPE-C signal based on the B-channel (i.e., first channel) interface corresponding to pins 16, 15, 11 and 10 upon receiving the low level enable signal TYPEC1_SEL (i.e., first enable signal). It will be appreciated that the TYPE-C signals are the TYPE_TXN2 signal, the TYPE_TXN1 signal, the TYPE_TXP2 signal, the TYPE_TXP1 signal, the TYPE_RXN2 signal, the TYPE_RXN1 signal, the TYPE_RXP2 signal and the TYPE_RXP1 signal.

And when the usb signal multiplexer 134 receives the high-level enable signal typec1_sel (i.e., the second enable signal), the output of the TYPE-C signal is completed based on the C-channel (i.e., the second channel) interface, which corresponds to the pins 16, 15, 11 and 10.

It should be understood that when the channel selection unit receives an uninserted signal or an inserted signal, that is, when any TYPE-C device is not connected to the TYPE-C interface sub-circuit 150, or when at least one TYPE-C device is connected to the TYPE-C interface sub-circuit 150, the channel selection unit generates a first or second enable signal, respectively, and sends the first/second enable signal to the universal serial bus signal multiplexer, so that the universal serial bus signal multiplexer determines an output channel of the TYPE-C signal based on the first/second enable signal.

In one possible manner, the channel selection unit provided in the embodiment of the present utility model is shown in fig. 7, and fig. 7 shows a schematic structural diagram of the channel selection unit in the signal protection sub-circuit 130 provided in the embodiment of the present utility model.

In the channel selection unit shown in fig. 7, when the TYPE-C device is accessed, the TYPE-C interface sub-circuit 150 determines the division of the front and back sides, generates a corresponding voltage signal (i.e., the TYPE ec1_cc1 signal output from the pin A5 in fig. 6) based on the insertion of the front and back sides, and transmits the TYPE ec1_cc1 signal to the channel selection unit.

When the channel selection unit does not receive the TYPEC1_CC1 signal or receives the non-insertion signal, a low-level enable signal TYPEC1_SEL (voltage magnitude of 0V) is generated; if the inserted signal is received, the first diode 135 and the second diode 136 in the channel selection unit are turned on at the same time, so as to generate the high-level enable signal TYPEC1_SEL (the voltage is not 0V).

Optionally, in an embodiment of the present utility model, the non-inserted signal is a voltage with a voltage magnitude being a first preset value or a second preset value, the inserted signal is a voltage with a voltage magnitude being in a preset interval, a lower interval limit of the preset interval is greater than the first preset value, and an upper interval limit of the preset interval is less than the second preset value. In one possible approach, the first preset value is 0V, the second preset value is 5V, and the preset interval is [1.57V,4.4V ].

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (10)

1. An interface conversion circuit is characterized by comprising a TYPE-A interface sub-circuit, a voltage protection sub-circuit, a signal protection sub-circuit, an electromagnetic compatibility sub-circuit and a TYPE-C interface sub-circuit;

the TYPE-A interface sub-circuit is electrically connected with the voltage protection sub-circuit and the signal protection sub-circuit respectively, the signal protection sub-circuit is electrically connected with the electromagnetic compatibility sub-circuit and the TYPE-C interface sub-circuit respectively, and the electromagnetic compatibility sub-circuit is electrically connected with the TYPE-C interface sub-circuit;

the TYPE-A interface sub-circuit is used for sending the received universal serial bus signal to the signal protection sub-circuit and providing preset voltage for the voltage protection sub-circuit, wherein the universal serial bus signal comprises a universal serial bus 2.0 signal and a universal serial bus 3.0 signal;

the voltage protection sub-circuit is used for converting the preset voltage into a stable voltage and providing the stable voltage for the signal protection sub-circuit, the electromagnetic compatibility sub-circuit and the TYPE-C interface sub-circuit;

the signal protection sub-circuit is used for receiving the universal serial bus signal, filtering the universal serial bus signal, converting a 3.0 signal of the universal serial bus signal after the filtering into a TYPE-C signal, sending the 2.0 signal of the universal serial bus after the filtering to the TYPE-C interface sub-circuit, and sending the TYPE-C signal to the electromagnetic compatibility sub-circuit;

the electromagnetic compatibility sub-circuit is used for receiving the TYPE-C signal, performing electromagnetic interference protection processing on the TYPE-C signal, and sending the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit;

the TYPE-C interface sub-circuit is used for receiving the filtered universal serial bus 2.0 signal and the protected TYPE-C signal and outputting the filtered universal serial bus 2.0 signal and the protected TYPE-C signal to external equipment.

2. The interface conversion circuit according to claim 1, wherein the voltage protection sub-circuit comprises a parasitic-free body diode MOS transistor, an input end of the parasitic-free body diode MOS transistor is electrically connected to the TYPE-a interface sub-circuit, an output end of the parasitic-free body diode MOS transistor is electrically connected to the signal protection sub-circuit, the electromagnetic compatibility sub-circuit, and the TYPE-C interface sub-circuit, and the parasitic-free body diode MOS transistor is configured to convert an input preset voltage into a stable voltage for output.

3. The interface conversion circuit of claim 2, wherein the voltage protection subcircuit further comprises a capacitor and a fuse;

the input end of the parasitic-free body diode MOS tube is electrically connected with the capacitor, and the output end of the parasitic-free body diode MOS tube is electrically connected with the signal protection sub-circuit, the electromagnetic compatibility sub-circuit and the TYPE-C interface sub-circuit through the fuse.

4. The interface conversion circuit according to claim 1, wherein the signal protection subcircuit includes a first common-mode inductance, a second common-mode inductance, a third common-mode inductance, a universal serial bus signal multiplexer, and a channel selection unit;

the first common-mode inductor and the second common-mode inductor are used for receiving the universal serial bus 3.0 signal, filtering the universal serial bus 3.0 signal, and sending the filtered universal serial bus 3.0 signal to the universal serial bus signal multiplexer;

the third common mode inductor is used for receiving the universal serial bus 2.0 signal, performing filtering processing on the universal serial bus 2.0 signal, and sending the filtered universal serial bus 2.0 signal to the TYPE-C interface sub-circuit;

the channel selection unit is used for generating a corresponding enabling signal according to the received TPYC-C interface insertion detection signal and sending the enabling signal to the universal serial bus signal multiplexer;

the universal serial bus signal multiplexer is used for generating the TYPE-C signal and sending the TYPE-C signal to the electromagnetic compatibility sub-circuit when the enabling signal and the filtered universal serial bus 3.0 signal are received.

5. The interface conversion circuit of claim 4, wherein the TPYC-C interface insertion detection signal includes an un-inserted signal and an inserted signal, the enable signal includes a first enable signal and a second enable signal, and the universal serial bus signal multiplexer includes a first channel and a second channel;

the channel selection unit is further configured to generate a first enable signal when the non-inserted signal is received and send the first enable signal to a universal serial bus signal multiplexer, and to generate a second enable signal when the inserted signal is received and send the second enable signal to the universal serial bus signal multiplexer;

the universal serial bus signal multiplexer is further configured to generate a TYPE-C signal when the first enable signal and the filtered universal serial bus signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit based on the first channel, and generate the TYPE-C signal when the second enable signal and the filtered universal serial bus signal 3.0 signal are received, and send the TYPE-C signal to the electromagnetic compatibility sub-circuit based on the second channel.

6. The interface conversion circuit according to claim 5, wherein the non-inserted signal is a voltage having a voltage level of a first preset value or a second preset value, the inserted signal is a voltage having a voltage level in a preset interval, a lower interval limit of the preset interval is greater than the first preset value, and an upper interval limit of the preset interval is less than the second preset value.

7. The interface conversion circuit of claim 4, wherein the universal serial bus signal multiplexer is a dual channel differential universal serial bus 3.1 multiplexer.

8. The interface conversion circuit of claim 1, wherein the electromagnetic compatibility sub-circuit comprises a first electrostatic discharge diode and a second electrostatic discharge diode;

the first electrostatic discharge diode and the second electrostatic discharge diode are both used for receiving the TYPE-C signal, performing electromagnetic interference protection processing on the TYPE-C signal, and sending the TYPE-C signal after the protection processing to the TYPE-C interface sub-circuit.

9. The interface conversion circuit according to claim 8, wherein the first and second electrostatic discharge diodes are IEC 61000-4-2 electrostatic diodes.

10. The interface conversion circuit according to claim 1, wherein the preset voltage is 5V.