CN217956959U - Interface switching device and RS232 interface device - Google Patents
Interface switching device and RS232 interface device Download PDFInfo
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- CN217956959U CN217956959U CN202221454202.XU CN202221454202U CN217956959U CN 217956959 U CN217956959 U CN 217956959U CN 202221454202 U CN202221454202 U CN 202221454202U CN 217956959 U CN217956959 U CN 217956959U
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Abstract
The application relates to an interface switching device and an RS232 interface device. The interface switching device comprises: the power supply conversion and isolation module is configured to convert an input voltage provided by the external equipment into a voltage to obtain an output voltage and provide the output voltage for the internal circuit; the electromagnetic compatibility filtering module is used for filtering ripples and noise in the input voltage; the signal isolation module is respectively connected with the primary side wiring terminal and the secondary side wiring terminal, and is used for carrying out signal isolation protection when the external equipment and the internal circuit mutually transmit data signals through the signal isolation module. The device can be used as a universal independent device to be added among signal interfaces of various existing devices and circuits, and comprehensive isolation protection is achieved.
Description
Technical Field
The application belongs to the technical field of signal interfaces, and particularly relates to an interface switching device and an RS232 interface device.
Background
Currently, in many industries, the external interface of the device needs to have an electrical isolation characteristic, and the main purpose is not to establish a direct current flow path between the internal area and the external area of the interface, so as to reduce mutual interference between two different circuits. For example, the environment of a certain actual circuit is poor, faults such as ground short circuit are easily caused, if electrical isolation is not adopted, the circuit is directly connected with a power supply, once the circuit has the phenomenon of ground short circuit, the whole system can be influenced by the circuit and can not work normally, after the electrical isolation is adopted, the normal work of the whole system can not be influenced when the circuit is in abnormal ground short circuit, meanwhile, the insulation condition of the circuit to the ground can be detected through an insulation monitoring device, once the circuit is grounded, an alarm can be timely sent out, managers can be reminded to maintain or process in time, and the occurrence of conditions such as power failure of a protection device trip and the like is avoided.
Meanwhile, for signal transmission between devices, most chips do not have corresponding signal isolation functions, and corresponding isolation circuits need to be additionally added on signal transmission lines of the chips aiming at specific ports, so that the design cost is increased.
SUMMERY OF THE UTILITY MODEL
The present application is directed to an interface adapter and an RS232 interface, and aims to solve the problem of connection and isolation between an internal circuit and an external device of a conventional electronic device.
A first aspect of an embodiment of the present application provides an interface adapter, including: the primary side wiring terminal is used for being connected with external equipment; the secondary side wiring terminal is used for being connected with an internal circuit; the power conversion isolation module is respectively connected with the primary wiring terminal and the secondary wiring terminal, and is used for performing voltage conversion on input voltage provided by the external equipment to obtain output voltage and providing the output voltage for the internal circuit; the electromagnetic compatibility filtering module is connected between the primary side wiring terminal and the power supply conversion isolation module and is used for filtering ripples and noise in the input voltage; the signal isolation module is respectively connected with the primary side wiring terminal and the secondary side wiring terminal and is used for isolating interference signals for data signals transmitted between the external equipment and the internal circuit; the power conversion isolation module is also connected with the signal isolation module and used for supplying power to the signal isolation module.
In one embodiment, the power conversion isolation module includes a power conversion isolation chip, an anode input end of the power conversion isolation chip is connected to a power end of the primary side connection terminal through the electromagnetic compatibility filter module, a ground end of the power conversion isolation chip is connected to a ground wire of the primary side connection terminal, an anode output end of the power conversion isolation chip is connected to a power end of the secondary side connection terminal, a cathode output end of the power conversion isolation chip is connected to a ground wire of the secondary side connection terminal, and the power conversion isolation chip is configured to generate the output voltage based on the input voltage.
In one embodiment, the electromagnetic compatibility filter module includes a first filter capacitor, a second filter capacitor and a magnetic bead; the first end of the first filter capacitor is connected with the power supply end of the primary side wiring terminal, the second end of the first filter capacitor is connected with the ground wire of the primary side wiring terminal, the first end of the second filter capacitor is connected with the positive input end of the power conversion isolation chip, the second end of the second filter capacitor is connected with the grounding end of the power conversion isolation chip, and the magnetic bead is connected between the first end of the first filter capacitor and the first end of the second filter capacitor.
In one embodiment, the power conversion isolation module further includes a voltage protection diode, an anode of the voltage protection diode is connected to a ground line of the primary side connection terminal, a cathode of the voltage protection diode is connected to a power supply terminal of the primary side connection terminal, and the voltage protection diode is configured to perform reverse breakdown of the voltage protection diode for overvoltage protection when a voltage value of the power supply terminal of the primary side connection terminal is greater than a breakdown threshold of the voltage protection diode.
In one embodiment, the power conversion isolation module further includes a first unidirectional conducting diode and a second unidirectional conducting diode; the anode of the first unidirectional conduction diode is connected with the anode output end of the power conversion isolation chip, the cathode of the first unidirectional conduction diode is connected with the power end of the secondary side wiring terminal, and the first unidirectional conduction diode is used for enabling the output voltage to be transmitted in a unidirectional mode; and the anode of the second one-way conduction diode is connected with the ground wire of the secondary side wiring terminal, and the cathode of the second one-way conduction diode is connected with the power supply end of the secondary side wiring terminal so as to form a follow current loop when the power supply conversion isolation chip is powered off.
In an embodiment, the power conversion isolation module further includes a third filter capacitor, a first end of the third filter capacitor is connected to the ground terminal of the power conversion isolation chip, a second end of the third filter capacitor is connected to the negative output terminal of the power conversion isolation chip, and the third filter capacitor is configured to balance charges at the ground terminal of the power conversion isolation chip and the negative output terminal of the power conversion isolation chip.
In an embodiment, the power conversion isolation module further includes a fourth filter capacitor and a fifth filter capacitor, a first end of the fourth filter capacitor is connected to the positive output end of the power conversion isolation chip, a second end of the fourth filter capacitor is connected to the negative output end of the power conversion isolation chip, a first end of the fifth filter capacitor is connected to the power supply end of the secondary connection terminal, and a second end of the fifth filter capacitor is connected to the ground line of the secondary connection terminal.
In one embodiment, the signal isolation module includes a signal isolation chip, a first power end of the signal isolation chip is connected with a power end of the primary side wiring terminal, and a second power end of the signal isolation chip is connected with an anode output end of the power conversion isolation chip; a first signal input end and a first signal output end corresponding to a first power end of the signal isolation chip are respectively connected with a data transmitting end and a data receiving end of the primary side wiring terminal, and a second signal input end and a second signal output end corresponding to a second power end of the signal isolation chip are respectively connected with a data receiving end and a data transmitting end of the secondary side wiring terminal.
In one embodiment, the signal isolation module further includes a first buffer resistor and a second buffer resistor, the first buffer resistor is connected between a second signal input end of the signal isolation chip and a data receiving end of the secondary connection terminal, and the second buffer resistor is connected between a second signal output end of the signal isolation chip and a data sending end of the secondary connection terminal; the signal isolation module further comprises a sixth filter capacitor and a seventh filter capacitor, wherein the first end of the sixth filter capacitor is connected with the first power end of the signal isolation chip, the second end of the sixth filter capacitor is connected with the first grounding end of the signal isolation chip, the first end of the seventh filter capacitor is connected with the second power end of the signal isolation chip, and the second end of the sixth filter capacitor is connected with the second grounding end of the signal isolation chip.
A first aspect of the embodiments of the present application provides an RS232 interface device, which includes the above-mentioned interface switching device, where both a primary connection terminal and a secondary connection terminal of the interface switching device include RS232 interfaces.
Compared with the prior art, the embodiment of the application has the beneficial effects that: most of interference signals in the input voltage can be removed through the voltage conversion of the power conversion isolation module, and meanwhile, a more stable output voltage can be obtained, so that the isolation of an internal circuit and external equipment is realized. The electromagnetic compatibility filtering module can filter ripples and noise in the input voltage, and further improves the stability of output voltage. The signal isolation module can realize communication between the internal circuit and the external equipment under the driving of the output voltage, and simultaneously realize isolation of interference signals between the internal circuit and the external equipment. The device can be used as a universal independent device to be added among signal interfaces of various existing devices and circuits, and comprehensive isolation protection is achieved.
Drawings
Fig. 1 is a schematic diagram of an interface adapter according to a first embodiment of the present application;
fig. 2 is a circuit diagram of a power conversion isolation module according to a first embodiment of the present application;
fig. 3 is a circuit schematic diagram of a signal isolation module according to a first embodiment of the present application.
The above figures illustrate: 100. a primary side wiring terminal; 200. a secondary side wiring terminal; 300. a power conversion isolation module; 400. an electromagnetic compatibility filtering module; 500. and a signal isolation module.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. 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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
A first embodiment of the present application provides an interface adapter, as shown in fig. 1, the interface adapter includes: the power supply comprises a primary side wiring terminal 100, a secondary side wiring terminal 200, a power supply conversion isolation module 300, an electromagnetic compatibility filtering module 400 and a signal isolation module 500.
The primary connection terminal 100 is used for connecting to an external device. The secondary connection terminal 200 is used for connection to an internal circuit. The power conversion isolation module 300 is connected to the primary connection terminal 100 and the secondary connection terminal 200, respectively, and the power conversion isolation module 300 is configured to perform voltage conversion on an input voltage provided by an external device to obtain an output voltage and provide the output voltage to an internal circuit, so as to isolate the external device from the internal circuit. The electromagnetic compatibility filtering module 400 is connected between the primary side connection terminal 100 and the power conversion isolation module 300, and is used for filtering ripples and noise in the input voltage. The signal isolation module 500 is respectively connected to the primary connection terminal 100 and the secondary connection terminal 200, and the signal isolation module 500 is configured to isolate an interference signal from a data signal transmitted between an external device and an internal circuit.
The embodiment can be used as a general device, is arranged between various circuits and devices, can provide a more stable output voltage to an internal circuit through the power conversion isolation module 300 and the electromagnetic compatibility filter module 400 based on an input voltage provided by an external device, and can also realize the exchange of data signals between the external device and the internal circuit through the signal isolation module 500 and isolate other interference signals except the data signals.
As shown in fig. 1 and fig. 2, in the present embodiment, the power conversion isolation module 300 includes a power conversion isolation chip U1, a positive input terminal VIN + of the power conversion isolation chip U1 is connected to the power terminal VCCIN of the primary terminal 100 through the electromagnetic compatibility filter module 400, a ground terminal GND of the power conversion isolation chip U1 is connected to the ground wire GNDIN of the primary terminal 100, a positive output terminal VO + of the power conversion isolation chip U1 is connected to the power terminal VCCIS of the secondary terminal 200, a negative output terminal VO-of the power conversion isolation chip U1 is connected to the ground wire GNDIS of the secondary terminal 200, and the power conversion isolation chip U1 is configured to generate an output voltage based on an input voltage. In this embodiment, the power conversion isolation chip U1 can stably output an output voltage of 5V with a power of 1W based on an input voltage of 4.4V to 5.5V, and the specific value can be adjusted according to actual requirements.
Specifically, the power supply terminal VCCIN of the primary-side connection terminal 100 is used for connecting with a power supply terminal of an external device to obtain an input voltage, and the ground line GNDIN of the primary-side connection terminal 100 can be connected with a ground terminal of the external device. The power supply terminal VCCIS of the secondary connection terminal 200 is used for connection to an operating voltage terminal of the internal circuit for supplying an output voltage to the internal circuit, and the ground line GNDIS of the secondary connection terminal 200 may be connected to a ground terminal of the internal circuit.
As shown in fig. 1 and fig. 2, in this embodiment, the electromagnetic compatibility filter module 400 includes a first filter capacitor C1, a second filter capacitor C2, and a magnetic bead FB; the first end of the first filter capacitor C1 is connected to the power supply end VCCIN of the primary side connection terminal 100, the second end of the first filter capacitor C1 is connected to the ground wire GNDIN of the primary side connection terminal 100, the first end of the second filter capacitor C2 is connected to the positive input end VIN + of the power conversion isolation chip U1, the second end of the second filter capacitor C2 is connected to the ground end GND of the power conversion isolation chip U1, and the magnetic bead FB is connected between the first end of the first filter capacitor C1 and the first end of the second filter capacitor C2.
It should be noted that the first filter capacitor C1, the second filter capacitor C2, and the magnetic bead FB may jointly form a pi-type filter network, which may filter ripples and noise in the input voltage, and implement EMC noise reduction.
As shown in fig. 1 and fig. 2, in this embodiment, the power conversion isolation module 300 further includes a voltage protection diode D1, an anode of the voltage protection diode D1 is connected to a ground GNDIN of the primary-side connection terminal 100, a cathode of the voltage protection diode D1 is connected to a power supply terminal VCCIN of the primary-side connection terminal 100, and the voltage protection diode D1 is configured to, when a voltage value of the power supply terminal VCCIN of the primary-side connection terminal 100 is greater than a breakdown threshold of the voltage protection diode D1, breakdown the voltage protection diode D1 in a reverse direction, and discharge a corresponding spike voltage for overvoltage protection. The Voltage protection Diode D1 may be a Transient Voltage Suppression (TVS) Diode, and in this embodiment, the breakdown threshold may be 6.4V, and specifically, the Voltage protection Diode D1 with a corresponding breakdown threshold may be set according to an actual situation.
As shown in fig. 1 and fig. 2, in this embodiment, the power conversion isolation module 300 further includes a first unidirectional conducting diode D2 and a second unidirectional conducting diode D3, an anode of the first unidirectional conducting diode D2 is connected to the anode output terminal VO + of the power conversion isolation chip U1, a cathode of the first unidirectional conducting diode D2 is connected to the power supply terminal VCCIS of the secondary connection terminal 200, and the first unidirectional conducting diode D2 is used for unidirectional transmission of the output voltage, so as to prevent the power conversion isolation chip U1 from being burned out when the power supply terminal VCCIS of the secondary connection terminal 200 is erroneously connected to a high voltage terminal. The anode of the second unidirectional conducting diode D3 is connected to the ground GNDIS of the secondary connection terminal 200, the cathode of the second unidirectional conducting diode D3 is connected to the power supply terminal VCCIS of the secondary connection terminal 200, and the second unidirectional conducting diode D3 is used to form a freewheeling circuit when the power conversion isolation chip U1 is powered off.
It should be noted that, if there is an inductive load in the internal circuit connected to the secondary connection terminal 200, the second unidirectional conducting diode D3 may form a follow current loop when the power conversion isolation chip U1 is suddenly powered off, so as to avoid that when the power conversion isolation chip U1 is powered off, the electric energy in the inductive load cannot be normally released through the circuit, which may cause damage to the internal circuit.
As shown in fig. 1 and fig. 2, in this embodiment, the power conversion isolation module 300 further includes a third filter capacitor C3, a first end of the third filter capacitor C3 is connected to the ground terminal GND of the power conversion isolation chip U1, a second end of the third filter capacitor C3 is connected to the negative output terminal VO-of the power conversion isolation chip U1, and the third filter capacitor C3 is configured to balance charges of the ground terminal GND of the power conversion isolation chip U1 and the negative output terminal VO-of the power conversion isolation chip U1. The third filter capacitor C3 can form a high frequency path to prevent the excessive accumulation of charges at one end of the power conversion isolation chip U1 from causing electromagnetic interference and even static electricity.
As shown in fig. 1 and fig. 2, in this embodiment, the power conversion isolation module 300 further includes a fourth filter capacitor C4 and a fifth filter capacitor C5, a first end of the fourth filter capacitor C4 is connected to the positive output terminal VO + of the power conversion isolation chip U1, a second end of the fourth filter capacitor C4 is connected to the negative output terminal VO-of the power conversion isolation chip U1, a first end of the fifth filter capacitor C5 is connected to the power supply terminal VCCIS of the secondary connection terminal 200, and a second end of the fifth filter capacitor C5 is connected to the ground line GNDIS of the secondary connection terminal 200. The fourth filter capacitor C4 and the fifth filter capacitor C5 are used for further stabilizing the voltages of the positive output terminal VO + of the power conversion isolation chip U1 and the power supply terminal VCCIS of the secondary connection terminal 200.
As shown in fig. 1, fig. 2, and fig. 3, in this embodiment, the signal isolation module 500 includes a signal isolation chip U2, a first power terminal VCC1 of the signal isolation chip U2 is connected to the power terminal VCCIN of the primary side connection terminal 100, and a second power terminal VCC2 of the signal isolation chip U2 is connected to the positive output terminal VO + of the power conversion isolation chip U1; a first signal input terminal INB and a first signal output terminal OUTA corresponding to a first power supply terminal VCC1 of the signal isolation chip U2 are respectively connected to a data transmitting terminal TX and a data receiving terminal RX of the primary side wiring terminal 100, and a second signal input terminal INA and a second signal output terminal OUTB corresponding to a second power supply terminal VCC2 of the signal isolation chip U2 are respectively connected to a data receiving terminal RXIS and a data transmitting terminal TXIS of the secondary side wiring terminal 200. The signal isolation chip U2 can isolate interference electric signals while transmitting data signals, and avoids mutual interference between an internal circuit and external equipment.
It should be noted that the primary connection terminal 100 and the secondary connection terminal 200 may include serial interfaces, such as RS232 interfaces and RS485 interfaces, or parallel interfaces, and the corresponding interfaces may be set according to actual requirements. In this embodiment, the signal isolation chip U2 is only provided with the first signal input terminal INB, the first signal output terminal OUTA, the second signal input terminal INA and the second signal output terminal OUTB. The signal ports of the signal isolation chip U2 may be configured according to a specific interface type.
Specifically, the first signal input terminal INB is connected to the data receiving terminal RX of the primary wiring terminal 100, the first signal output terminal OUTA is connected to the data transmitting terminal TX of the primary wiring terminal 100, the second signal input terminal INA is connected to the data receiving terminal RXIS of the secondary wiring terminal 200, and the second signal output terminal OUTB is connected to the data transmitting terminal TXIS of the secondary wiring terminal 200. The first signal input terminal INB may couple the received data signal to the second signal output terminal OUTB for output, and the second signal input terminal INA may couple the received data signal to the first signal output terminal OUTA for output, that is, the signal isolation chip U2 of this embodiment is a dual-channel isolation chip applied to the RS232 interface. The first ground terminal GND1 of the signal isolation chip U2 is connected to the ground line GNDIN of the primary side connection terminal 100, and the second ground terminal GND2 of the signal isolation chip U2 is connected to the ground line GNDIS of the secondary side connection terminal 200.
In another embodiment, the primary connection terminal 100 and the secondary connection terminal 200 each include a parallel interface, and the signal isolation chip U2 is a multi-channel signal isolation chip for matching with the parallel interface.
As shown in fig. 1, fig. 2, and fig. 3, in this embodiment, the signal isolation module 500 further includes a first buffer resistor R1 and a second buffer resistor R2, the first buffer resistor R1 is connected between the first signal output terminal OUTA of the signal isolation chip U2 and the data receiving terminal RXIS of the secondary connection terminal 200, and the second buffer resistor R2 is connected between the second signal output terminal OUTB of the signal isolation chip U2 and the data transmitting terminal TXIS of the secondary connection terminal 200. The first buffer resistor R1 and the second buffer resistor R2 are used for avoiding overshoot of the signal output or received by the signal isolation chip U2.
As shown in fig. 1, fig. 2, and fig. 3, in this embodiment, the signal isolation module 500 further includes a sixth filter capacitor C6 and a seventh filter capacitor C7, a first end of the sixth filter capacitor C6 is connected to the first power terminal VCC1 of the signal isolation chip U2, a second end of the sixth filter capacitor C6 is connected to the first ground terminal GND1 of the signal isolation chip U2, a first end of the seventh filter capacitor C7 is connected to the second power terminal VCC2 of the signal isolation chip U2, and a second end of the sixth filter capacitor C6 is connected to the second ground terminal GND2 of the signal isolation chip U2. The sixth filter capacitor C6 and the seventh filter capacitor C7 are used for further stabilizing the voltages of the first power supply terminal VCC1 of the signal isolation chip U2 and the second power supply terminal VCC2 of the signal isolation chip U2.
A second embodiment of the present application provides an RS232 interface device, which includes the interface adapter device according to the first embodiment. The primary connection terminal 100 and the secondary connection terminal 200 of the interface switching device both include RS232 interfaces. The RS232 interface of the primary connecting terminal 100 includes the data receiving terminal RX and the data transmitting terminal TX according to the above-described embodiments, and the RS232 interface of the secondary connecting terminal 200 includes the data receiving terminal RXIS and the data receiving terminal RXIS according to the above-described embodiments.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the apparatus may be divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An interface adapter device, comprising:
the primary side wiring terminal is used for being connected with external equipment;
the secondary side wiring terminal is used for being connected with an internal circuit;
the power supply conversion and isolation module is respectively connected with the primary side wiring terminal and the secondary side wiring terminal, and is used for performing voltage conversion on input voltage provided by the external equipment to obtain and provide output voltage for the internal circuit;
the electromagnetic compatibility filtering module is connected between the primary side wiring terminal and the power supply conversion isolation module and is used for filtering ripples and noise in the input voltage;
the signal isolation module is respectively connected with the primary side wiring terminal and the secondary side wiring terminal and is used for isolating interference signals for data signals transmitted between the external equipment and the internal circuit;
the power conversion isolation module is also connected with the signal isolation module and used for supplying power to the signal isolation module.
2. The interface adapter as recited in claim 1, wherein the power conversion isolation module comprises a power conversion isolation chip, a positive input terminal of the power conversion isolation chip is connected to the power terminal of the primary side connection terminal through the emc filter module, a ground terminal of the power conversion isolation chip is connected to the ground terminal of the primary side connection terminal, a positive output terminal of the power conversion isolation chip is connected to the power terminal of the secondary side connection terminal, a negative output terminal of the power conversion isolation chip is connected to the ground terminal of the secondary side connection terminal, and the power conversion isolation chip is configured to generate the output voltage based on the input voltage.
3. The interface adapter device of claim 2, wherein the emc filter module comprises a first filter capacitor, a second filter capacitor, and a magnetic bead;
the first end of the first filter capacitor is connected with the power supply end of the primary side wiring terminal, the second end of the first filter capacitor is connected with the ground wire of the primary side wiring terminal, the first end of the second filter capacitor is connected with the positive input end of the power supply conversion isolation chip, the second end of the second filter capacitor is connected with the ground end of the power supply conversion isolation chip, and the magnetic bead is connected between the first end of the first filter capacitor and the first end of the second filter capacitor.
4. The interface transition device of claim 2, wherein the power conversion isolation module further comprises a voltage protection diode, an anode of the voltage protection diode is connected to a ground line of the primary side connection terminal, a cathode of the voltage protection diode is connected to the power supply terminal of the primary side connection terminal, and the voltage protection diode is configured to reverse breakdown for over-voltage protection when the voltage value of the power supply terminal of the primary side connection terminal is greater than a breakdown threshold of the voltage protection diode.
5. The interface transition device of claim 4, wherein the power conversion isolation module further comprises a first unidirectional conducting diode and a second unidirectional conducting diode;
the anode of the first unidirectional conduction diode is connected with the anode output end of the power conversion isolation chip, the cathode of the first unidirectional conduction diode is connected with the power supply end of the secondary side wiring terminal, and the first unidirectional conduction diode is used for enabling the output voltage to be transmitted in a unidirectional mode; and the anode of the second one-way conduction diode is connected with the ground wire of the secondary side wiring terminal, and the cathode of the second one-way conduction diode is connected with the power supply end of the secondary side wiring terminal so as to form a follow current loop when the power conversion isolation chip is powered off.
6. The interface switching device according to claim 2, wherein the power conversion isolation module further comprises a third filter capacitor, a first end of the third filter capacitor is connected to the ground terminal of the power conversion isolation chip, a second end of the third filter capacitor is connected to the negative output terminal of the power conversion isolation chip, and the third filter capacitor is configured to balance charges at the ground terminal of the power conversion isolation chip and the negative output terminal of the power conversion isolation chip.
7. The interface adapter device according to claim 2, wherein the power conversion isolation module further comprises a fourth filter capacitor and a fifth filter capacitor, a first end of the fourth filter capacitor is connected to the positive output terminal of the power conversion isolation chip, a second end of the fourth filter capacitor is connected to the negative output terminal of the power conversion isolation chip, a first end of the fifth filter capacitor is connected to the power supply terminal of the secondary connection terminal, and a second end of the fifth filter capacitor is connected to the ground terminal of the secondary connection terminal.
8. The interface switching device according to any one of claims 2 to 7, wherein the signal isolation module comprises a signal isolation chip, a first power end of the signal isolation chip is connected to the power end of the primary side connection terminal, and a second power end of the signal isolation chip is connected to the positive output end of the power conversion isolation chip;
a first signal input end and a first signal output end which correspond to a first power supply end of the signal isolation chip are respectively connected with a data transmitting end and a data receiving end of the primary side wiring terminal, and a second signal input end and a second signal output end which correspond to a second power supply end of the signal isolation chip are respectively connected with a data receiving end and a data transmitting end of the secondary side wiring terminal.
9. The interface switching device according to claim 8, wherein the signal isolation module further comprises a first buffer resistor and a second buffer resistor, the first buffer resistor is connected between the second signal input terminal of the signal isolation chip and the data receiving terminal of the secondary connection terminal, and the second buffer resistor is connected between the second signal output terminal of the signal isolation chip and the data sending terminal of the secondary connection terminal;
the signal isolation module further comprises a sixth filter capacitor and a seventh filter capacitor, wherein the first end of the sixth filter capacitor is connected with the first power end of the signal isolation chip, the second end of the sixth filter capacitor is connected with the first grounding end of the signal isolation chip, the first end of the seventh filter capacitor is connected with the second power end of the signal isolation chip, and the second end of the sixth filter capacitor is connected with the second grounding end of the signal isolation chip.
10. An RS232 interface device comprising the interface transition device of any one of claims 1 to 9, wherein the primary terminal and the secondary terminal of the interface transition device each comprise an RS232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221454202.XU CN217956959U (en) | 2022-06-10 | 2022-06-10 | Interface switching device and RS232 interface device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221454202.XU CN217956959U (en) | 2022-06-10 | 2022-06-10 | Interface switching device and RS232 interface device |
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| CN217956959U true CN217956959U (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221454202.XU Active CN217956959U (en) | 2022-06-10 | 2022-06-10 | Interface switching device and RS232 interface device |
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| CN (1) | CN217956959U (en) |
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2022
- 2022-06-10 CN CN202221454202.XU patent/CN217956959U/en active Active
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