Flow transmitter interface circuit

Abstract

The utility model relates to the field of flow transmitter interfaces of hydrogen filling machines, in particular to a flow transmitter interface circuit. Comprising a controller (U1000C), a first connector (CN400), an isolation transceiver (U400), a first transient suppression diode (T400), a second transient suppression diode (T401), a third transient suppression diode (T402), a first voltage stabilizing diode (T410), a second voltage stabilizing diode (T411), a first photoelectric coupler (U401), a second photoelectric coupler (U402) and a first resistor (R400). According to the utility model, the isolation transceiver and the photoelectric coupler are added between the flow transmitter interface and the controller of the hydrogen filling machine, electrical isolation between the flow transmitter interface and the controller is realized through the isolation transceiver, interference of other electromagnetic signals is reduced, and the signal transmission quality is improved; a transient suppression diode is added, the safety of equipment is improved, a voltage stabilizing diode is added on a connector interface, and the stability of the equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of flow transmitter interfaces for hydrogen filling machines, in particular to a flow transmitter interface circuit. Background Art

[0002] The hydrogen dispenser flow transmitter interface is a crucial component in hydrogen fueling stations, used to monitor and control hydrogen flow. In hydrogen energy applications, ensuring the safe and accurate transmission of hydrogen to storage facilities or direct fueling into fuel cell vehicles is crucial. The flow transmitter's primary function is to convert the hydrogen flow rate through the pipeline into an electrical signal, which is then transmitted to the control system for processing and monitoring.

[0003] However, the current flow transmitter interface directly sends the converted electrical signal to the controller without isolation measures, making the electrical signal susceptible to interference from other electromagnetic signals. This may lead to signal quality degradation, data transmission errors, and even abnormal device behavior, and also reduce device safety. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a flow transmitter interface circuit, which reduces the interference of other electromagnetic signals and improves the quality of signal transmission.

[0005] The utility model adopts the following technical solutions to achieve the above purpose. The utility model provides a flow transmitter interface circuit, including a controller U1000C, a first connector CN400, an isolation transceiver U400, a first transient suppression diode T400, a second transient suppression diode T401, a third transient suppression diode T402, a first voltage regulator diode T410, a second voltage regulator diode T411, a first photocoupler U401, a second photocoupler U402, a first resistor R400, a second resistor R411, a first resistor R412, a second resistor R413, a first resistor R414, a second resistor R415, a first resistor R416, a second resistor R417, a first resistor R418, a second resistor R419, a first resistor R420, a second resistor R421, a first resistor R422, a first resistor R423, a second resistor R424, a first resistor R425, a second resistor R426, a first resistor R427, a second resistor R428, a first resistor R429, a second resistor R430, a first resistor R431, a second resistor R432, a first resistor R433, a second resistor R434, a first resistor R435, a second resistor R436, a first resistor R437, a second resistor R438, a first resistor R439, a second resistor R440, a first resistor R441 Resistor R401, third resistor R402, fourth resistor R403, fifth resistor R404, sixth resistor R405, seventh resistor R406, eighth resistor R410, ninth resistor R411, tenth resistor R412, eleventh resistor R413, twelfth resistor R414, thirteenth resistor R415, first capacitor C400, the first pin of the isolation transceiver U400 is connected to the controller data receiving terminal USART1_RXD through the first resistor R400, and the second pin of the isolation transceiver U400 is connected to the controller data receiving terminal USART1_RXD through the first resistor R400. The third pin of the isolated transceiver U400 is connected to the controller data transmitting terminal USART1_TXD through the second resistor R401, the fourth pin is grounded through the first capacitor C400, the fifth pin is connected to the seventh pin and the sixth pin of the isolated transceiver U400 through the first transient voltage suppression diode T400 and the second transient voltage suppression diode T401 respectively, the third transient voltage suppression diode T402 is connected between the seventh pin and the sixth pin of the isolated transceiver U400, and the eighth pin of the isolated transceiver U400 is connected through the fifth transient voltage suppression diode T402. The resistor R404 is connected to the sixth pin of the isolation transceiver U400. The seventh pin of the isolation transceiver U400 is connected to the sixth pin of the isolation transceiver U400 through the second photocoupler U402, the seventh resistor R406, and the fourth resistor R403. The seventh and sixth pins of the isolation transceiver U400 output signals to the fourth and third pins of the first connector CN400, respectively. The fifth pin of the isolation transceiver (U400) is also connected to the seventh pin of the isolation transceiver (U400) through the sixth resistor (R405).

[0006] The collector of the transistor at the light-receiving end of the first photocoupler U401 is connected to the external power supply through the eighth resistor R410, the emitter is grounded, the cathode of the light-emitting diode at the first photocoupler U401 is grounded, and the anode is connected to the sixth pin of the first connector CN400 through the ninth resistor R411. The collector of the transistor at the light-receiving end of the second photocoupler U402 is connected to the external power supply through the tenth resistor R412, the emitter of the transistor at the light-receiving end is grounded, the cathode of the light-emitting diode at the second photocoupler U402 is grounded, and the anode is connected to the seventh pin of the first connector CN400 through the eleventh resistor R413. The ninth pin of the first connector CN400 is respectively connected to the anodes of the first Zener diode T410 and the second Zener diode T411 through the thirteenth resistor R415, and the cathodes of the first Zener diode T410 and the second Zener diode T411 are grounded.

[0007] Furthermore, the model of the controller U1000C is GD32F450ZKT6.

[0008] Furthermore, the model of the isolation transceiver U400 is TD301M485.

[0009] Furthermore, the model of the first transient voltage suppressor diode T400, the second transient voltage suppressor diode T400 and the third transient voltage suppressor diode T400 is SMF6.5CA.

[0010] Furthermore, the model of the first Zener diode T410 and the second Zener diode T411 is 1SMB5930B.

[0011] Beneficial effects of the utility model:

[0012] This utility model adds an isolation transceiver U400 and optocouplers U401 and U402 between the hydrogen filling machine's flow transmitter interface and the controller. The isolation transceiver achieves electrical isolation between the flow transmitter interface and the controller, reducing interference from other electromagnetic signals and improving signal transmission quality. Transient voltage suppression diodes T400, T401, and T402 are added to the isolation transceiver circuit to enhance device safety. Zener diodes T410 and T411 are added to the connector interface to improve device stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of a controller provided by an embodiment of the present utility model;

[0014] Figure 2 This is a circuit diagram of an isolated transceiver provided by an embodiment of the utility model;

[0015] Figure 3This is a circuit structure diagram of a first connector provided by an embodiment of the present utility model;

[0016] Figure 4 This is a circuit structure diagram of a first photoelectric coupler and a second photoelectric coupler provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0018] The utility model provides a flow transmitter interface circuit, such as Figures 1 to 4 As shown, it includes a controller U1000C, a first connector CN400, an isolation transceiver U400, a first transient voltage suppression diode T400, a second transient voltage suppression diode T401, a third transient voltage suppression diode T402, a first voltage regulator diode T410, a second voltage regulator diode T411, a first photocoupler U401, a second photocoupler U402, a first resistor R400, a second resistor R401, a third resistor R402, a fourth resistor R403, and a fifth resistor R404. Resistor R404, sixth resistor R405, seventh resistor R406, eighth resistor R410, ninth resistor R411, tenth resistor R412, eleventh resistor R413, twelfth resistor R414, thirteenth resistor R415, first capacitor C400, the first pin of the isolation transceiver U400 is connected to the controller data receiving terminal USART1_RXD through the first resistor R400, the second pin of the isolation transceiver U400 is connected to the controller data transmitting terminal USART1_TXD through the second resistor R401, the third pin of the isolation transceiver U400 is grounded, the fourth pin is grounded through the first capacitor C400, the fifth pin is connected to the seventh pin and the sixth pin of the isolation transceiver U400 through the first transient voltage suppression diode T400 and the second transient voltage suppression diode T401 respectively, the third transient voltage suppression diode T402 is connected between the seventh pin and the sixth pin of the isolation transceiver U400, and the eighth pin of the isolation transceiver U400 is connected to the isolation transceiver U400 through the fifth resistor R404. The sixth pin of the transceiver U400 is connected, the seventh pin of the isolation transceiver U400 is connected to the sixth pin of the isolation transceiver U400 through the second photocoupler U402, the seventh resistor R406 and the fourth resistor R403, the seventh pin and the sixth pin of the isolation transceiver U400 output signals to the fourth pin and the third pin of the first connector CN400 respectively, and the fifth pin of the isolation transceiver (U400) is also connected to the seventh pin of the isolation transceiver (U400) through the sixth resistor (R405);

[0019] The collector of the transistor at the light-receiving end of the first photocoupler U401 is connected to the external power supply through the eighth resistor R410, the emitter is grounded, the cathode of the light-emitting diode at the first photocoupler U401 is grounded, and the anode is connected to the sixth pin of the first connector CN400 through the ninth resistor R411. The collector of the transistor at the light-receiving end of the second photocoupler U402 is connected to the external power supply through the tenth resistor R412, the emitter of the transistor at the light-receiving end is grounded, the cathode of the light-emitting diode at the second photocoupler U402 is grounded, and the anode is connected to the seventh pin of the first connector CN400 through the eleventh resistor R413. The ninth pin of the first connector CN400 is respectively connected to the anodes of the first Zener diode T410 and the second Zener diode T411 through the thirteenth resistor R415, and the cathodes of the first Zener diode T410 and the second Zener diode T411 are grounded.

[0020] Specifically, the controller U1000C is the GD32F450ZKT6. This model boasts ultra-high computing performance, with a processor clocked at up to 200MHz. It offers a complete DSP instruction set, parallel computing capabilities, and a dedicated floating-point unit (FPU), integrating 32-bit control with leading digital signal processing technology to meet advanced computing needs. Code can be executed directly from flash memory at high speed with zero wait time. The GD32F450 is equipped with 512KB to 3072KB of on-chip Flash and 256KB to 512KB of SRAM. The dual-bank Flash allows for simultaneous read and write operations, facilitating secure program upgrades and enabling software updates without impacting application performance.

[0021] Peripheral interface resources include 8 USARTs, 6 SPIs, 3 fast I2Cs, 2 I2Ss, 2 CAN2.0Bs, 1 SDIO interface, 1 10 / 100M Ethernet controller MAC, and for the first time, two USB2.0 OTG interfaces, including full-speed FullSpeed, 12Mbps and high-speed HighSpeed, 480Mbps interfaces, which can provide multiple transmission modes such as Device, HOST, OTG, etc.

[0022] Specifically, the isolated transceiver U400 is model TD301M485. Its primary function is to convert logic levels into RS-485 differential levels, achieving signal isolation. This model utilizes integrated circuit technology to integrate power supply isolation, signal isolation, RS-485 communication, and bus protection into an RS-485 protocol transceiver module. It comes with a built-in constant-voltage isolated power supply, enabling 2500VDC electrical isolation. It features automatic transceiver switching, eliminating the need for transceiver control pins, reducing design complexity. It can be easily embedded into user devices, allowing transmission devices to easily connect to RS485 network connections.

[0023] Specifically, the model of the first transient voltage suppression diode T400 , the second transient voltage suppression diode T400 , and the third transient voltage suppression diode T400 is SMF6.5CA.

[0024] Specifically, the model of the first Zener diode T410 and the second Zener diode T411 is 1SMB5930B.

[0025] The working principle of this utility model:

[0026] The controller runs the predetermined flow transmitter program and outputs the control signal through the UART interface. The control signal is electrically isolated from the external circuit through U400, and the TTL level is converted to RS485 level. The control signal output by the controller is transmitted to the flow transmitter through the RS485 bus to realize the control of the flow transmitter.

[0027] During the operation of the flow transmitter, two status signals of the flow transmitter are detected at the same time. After being electrically isolated by the front-end optoelectronic isolators U401 and U402, the signals are input to the corresponding pins of the controller to realize the state perception of the flow transmitter, provide the controller with calculation processing, and implement closed-loop control of the flow transmitter based on the results.

[0028] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A flow transmitter interface circuit, characterized in that: The invention comprises a controller (U1000C), a first connector (CN400), an isolation transceiver (U400), a first transient voltage suppression diode (T400), a second transient voltage suppression diode (T401), a third transient voltage suppression diode (T402), a first voltage stabilizing diode (T410), a second voltage stabilizing diode (T411), a first photocoupler (U401), a second photocoupler (U402), a first resistor (R400), a second resistor (R401), a third resistor (R402), a fourth resistor (R403 ... voltage stabilizing diode (T411), a first voltage stabilizing diode (T411), a first voltage stabilizing diode (T411), a first voltage stabilizing diode (T411), a first voltage stabilizing diode (T411 The fifth resistor (R404), the sixth resistor (R405), the seventh resistor (R406), the eighth resistor (R410), the ninth resistor (R411), the tenth resistor (R412), the eleventh resistor (R413), the twelfth resistor (R414), the thirteenth resistor (R415), the first capacitor (C400), the first pin of the isolation transceiver (U400) is connected to the controller data receiving end (USART1_RXD) through the first resistor (R400), and the second pin of the isolation transceiver (U400) is connected to the controller data receiving end (USART1_RXD) through the second resistor (R401 ) is connected to the controller data sending end (USART1_TXD), the third pin of the isolation transceiver (U400) is grounded, the fourth pin is grounded through the first capacitor (C400), the fifth pin is connected to the seventh pin and the sixth pin of the isolation transceiver (U400) through the first transient suppression diode (T400) and the second transient suppression diode (T401), respectively, the third transient suppression diode (T402) is connected between the seventh pin and the sixth pin of the isolation transceiver (U400), and the eighth pin of the isolation transceiver (U400) is connected through the fifth resistor (R 404) is connected to the sixth pin of the isolation transceiver (U400), the seventh pin of the isolation transceiver (U400) is connected to the sixth pin of the isolation transceiver (U400) through the second photocoupler (U402), the seventh resistor (R406) and the fourth resistor (R403), the seventh pin and the sixth pin of the isolation transceiver (U400) output signals to the fourth pin and the third pin of the first connector (CN400) respectively, and the fifth pin of the isolation transceiver (U400) is also connected to the seventh pin of the isolation transceiver (U400) through the sixth resistor (R405); The collector of the triode at the light-receiving end of the first photocoupler (U401) is connected to the external power supply through an eighth resistor (R410), the emitter is grounded, the cathode of the light-emitting diode of the first photocoupler (U401) is grounded, and the anode is connected to the sixth pin of the first connector (CN400) through a ninth resistor (R411). The collector of the triode at the light-receiving end of the second photocoupler (U402) is connected to the external power supply through a tenth resistor (R412), the emitter of the triode at the light-receiving end is grounded, the cathode of the light-emitting diode of the second photocoupler (U402) is grounded, and the anode is connected to the seventh pin of the first connector (CN400) through an eleventh resistor (R413). The ninth pin of the first connector (CN400) is respectively connected to the anodes of the first Zener diode (T410) and the second Zener diode (T411) through a thirteenth resistor (R415), and the cathodes of the first Zener diode (T410) and the second Zener diode (T411) are grounded.

2. The flow transmitter interface circuit according to claim 1, characterized in that: The model of the controller (U1000C) is GD32F450ZKT6.

3. The flow transmitter interface circuit according to claim 1, characterized in that: The model of the isolation transceiver (U400) is TD301M485.

4. The flow transmitter interface circuit according to claim 1, characterized in that: The model of the first transient voltage suppression diode (T400), the second transient voltage suppression diode (T400) and the third transient voltage suppression diode (T400) is SMF6.5CA.

5. The flow transmitter interface circuit according to claim 1, characterized in that: The model of the first Zener diode (T410) and the second Zener diode (T411) is 1SMB5930B.

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