A signal transmission circuit, device and charging pile

Abstract

The utility model discloses a signal transmission circuit, device and charging pile, including charging module and backboard circuit, when charging module and backboard circuit butt joint, control module according to the input state of dial switch control switch device's conduction or open, to generate corresponding PWM signal, photoelectric coupler device is used for responding PWM signal, and forms the identification information for indicating PWM signal. That is, the technical scheme controls the conduction state of the switch device through the control module in the backboard circuit to adjust the size of the current in the load loop, so that the photoelectric coupler device in the charging module generates the conduction and cutoff state corresponding to the address information, realizing the address signal transmission and identification in the form of PWM. The technical scheme does not need to increase the complex communication interface at the charging module end, does not depend on the device parameter detection of precision sensitivity, can realize the stable and reliable address identification under the condition of using only two power supply signal pins, and effectively reduces the signal pin quantity.

Description

Technical Field

[0001] This utility model relates to the field of PWM transmission technology, and in particular to a signal transmission circuit, device and charging pile. Background Technology

[0002] In existing charging pile systems, charging modules typically need to identify the address information configured on the backplane to achieve pairing and communication between the module and the system. Therefore, two main address identification schemes exist in related technologies: One approach involves using the charging module to detect differences in component parameters on the backplane to determine address information. This includes detecting parameters of different resistors and capacitors connected to the backplane; these parameters are typically controlled by DIP switches to create different address configurations. However, this parameter detection method has the following drawbacks: firstly, the number of configurable addresses is limited by the detection accuracy of the component parameters; secondly, the weak detection signal is susceptible to external interference, leading to a high error rate and poor reliability.

[0003] Option two involves the backplane actively reporting address information to the charging module via communication, for example, by adding an extra data line or communication interface to transmit address data. While this method offers high identification accuracy and stability, it requires transmitting power supply voltage, ground wire, and address signals, typically necessitating at least three signal pins. This increases the complexity and cost of the connector and hinders highly integrated module design.

[0004] Therefore, the relevant technologies need to be improved. Utility Model Content

[0005] The main objective of this invention is to provide a signal transmission circuit, device, and charging pile to at least solve the technical problems mentioned in the related art.

[0006] To achieve the above objectives, the first aspect of this utility model provides a signal transmission circuit, including a charging module and a backplane circuit. The charging module includes an optocoupler and a current-limiting resistor, and the backplane circuit includes a load resistor and a control module, the control module being electrically connected to a DIP switch; One end of the optocoupler and one end of the current-limiting resistor are both used to receive the power supply voltage. The other end of the optocoupler is simultaneously electrically connected to the other end of the current-limiting resistor, the control module, and one end of the load resistor. The other end of the load resistor is simultaneously electrically connected to the first end of the switching device in the control module, and the second end of the switching device is grounded. When the charging module is connected to the backplane circuit, the control module controls the switching device to be turned on or off according to the input state of the DIP switch to generate a corresponding PWM signal. The optocoupler is used to respond to the PWM signal and form identification information to indicate the PWM signal.

[0007] A second aspect of this utility model provides a signal transmission device, including a device body and a signal transmission circuit as described in the first aspect, wherein the signal transmission circuit is disposed within the device body.

[0008] A third aspect of this utility model provides a charging pile, including a charging pile body and a signal transmission device as described in the second aspect, wherein the signal transmission device is disposed on the charging pile body.

[0009] This utility model relates to a signal transmission circuit, device, and charging pile. The control module in the backplane circuit controls the conduction state of the switching devices to regulate the current flow in the load circuit. This causes the optocoupler in the charging module to generate conduction and cutoff states corresponding to the address information, achieving PWM-based address signal transmission and recognition. This technical solution eliminates the need for complex communication interfaces on the charging module and does not rely on precision-sensitive device parameter detection. It achieves stable and reliable address recognition using only two power supply signal pins, effectively reducing the number of signal pins, improving anti-interference capabilities and module recognition accuracy, and simplifying the overall structure. It is suitable for modular, highly integrated charging pile systems. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A circuit connection diagram of a signal transmission circuit provided in an embodiment of this application; Figure 2 A circuit connection diagram of a signal transmission circuit provided in an embodiment of this application; Figure 3 A circuit connection diagram of a signal transmission circuit provided in an embodiment of this application; Figure 4 This is a circuit connection diagram of a signal transmission circuit provided in an embodiment of this application. Detailed Implementation

[0012] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0014] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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. The term "multiple" means two or more, unless otherwise explicitly specified. The term "comprising" indicates the presence of the described feature, whole, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. The term "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may include three cases: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0015] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art; the terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0016] Furthermore, terms such as "exemplary," "for example," and "optional" are used to indicate illustrative purposes. Any technical solution described by the above terms in the embodiments of this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, these terms are intended to present the relevant technical concepts in terms of specific implementation methods.

[0017] Please see Figure 1This application provides a signal transmission circuit (suitable for address identification of charging modules in a charging pile system), which includes at least a charging module 10 and a backplane circuit 20.

[0018] The charging module 10 is installed inside the charging pile (e.g., on the front) and connected to the backplane circuit 20 via a plug-in connection. It includes an optocoupler Z1 and a current-limiting resistor Ra. The backplane circuit 20 is installed on the back of the charging pile and includes a load resistor Rb and a control module 201. One port 201B of the control module 201 is electrically connected to a DIP switch 202.

[0019] Specifically, one end of the optocoupler Z1 and one end of the current-limiting resistor Ra are both used to receive the power supply voltage (5V). The other end of the optocoupler Z1 is simultaneously electrically connected to the other end of the current-limiting resistor Ra, one port 201A of the control module 201, and one end of the load resistor Rb. The other end of the load resistor Rb is simultaneously electrically connected to the first end of the switching device S1 in the control module 201, and the second end of the switching device S1 is grounded.

[0020] In practical applications, the charging module 10 establishes an electrical connection with the backplane circuit 20 via a plug-in connection. Once the connection is complete, the detection channel formed by the optocoupler Z1 and the current-limiting resistor Ra is ready for operation. At this time, the control module 201 outputs a control signal based on the input state of the DIP switch 202 to control the switching device S1 to turn on or off, thereby controlling whether the load resistor Rb is connected to the circuit. By periodically controlling whether S1 is on or off, the backplane circuit 20 can generate current pulses in the optocoupler Z1 circuit, causing the optocoupler Z1 to turn on or off with a predetermined duty cycle, thereby outputting a PWM signal corresponding to the address information.

[0021] The "DIP switch 202" is a switch used to set or configure system parameters. Its essential function is to provide one or more switch states (on or off) as input signals, rather than the "operation" itself. For example, when a bit of the DIP switch 202 is set to the "ON" position, the corresponding circuit node level is pulled low or high, causing the optocoupler Z1 to respond to the corresponding level as either cut off or on, thereby generating a corresponding PWM recognition signal for the subsequent detection module to identify as a valid address bit.

[0022] When the charging module 10 is connected to the backplane circuit 20, the control module 201 controls the switching device S1 to be turned on or off according to the input state of the DIP switch 202 to generate a corresponding PWM signal. The optocoupler Z1 is used to respond to the PWM signal and form identification information to indicate the PWM signal. Specifically, when the switching device S1 is turned on, the load resistor Rb in the backplane circuit 20 forms a loop with the supply voltage (Addr_5V load increases), causing the optocoupler Z1 in the charging module 10 to be turned on to generate a high-level identification signal; when the switching device S1 is turned off, the loop is interrupted, the optocoupler Z1 is turned off to generate a low-level identification signal.

[0023] As can be seen, the signal transmission circuit of this application embodiment controls the conduction state of the switching device through the control module in the backplane circuit to adjust the current in the load circuit, thereby causing the optocoupler in the charging module to generate conduction and cutoff states corresponding to the address information, realizing address signal transmission and recognition in the form of PWM. This technical solution does not require adding a complex communication interface to the charging module end, nor does it rely on precision-sensitive device parameter detection. It can achieve stable and reliable address recognition using only two power supply signal pins, effectively reducing the number of signal pins, improving anti-interference capability and module recognition accuracy, simplifying the overall structure, and is suitable for modular and highly integrated charging pile systems.

[0024] In an optional embodiment of this application, the charging module 10 forms a first docking terminal A1 and a second docking terminal A2, and the backplane circuit 20 forms a third docking terminal B1 and a fourth docking terminal B2, for realizing signal and power connection between the charging module 10 and the backplane circuit 20.

[0025] Specifically, the first terminal A1 includes the other end of the optocoupler Z1 and the other end of the current-limiting resistor Ra, used to receive the address identification signal output from the backplane side; the second terminal A2 is used to connect to the ground wire, providing a ground reference potential for the optocoupler circuit. The third terminal B1 includes the output port of the control module 201 and one end of the load resistor Rb; the fourth terminal B2 includes the second end of the switching device S1, used to connect to the system ground wire.

[0026] In the assembled state, the first docking terminal A1 is electrically connected to the third docking terminal B1 via a wire (e.g., the first wire), and the second docking terminal A2 is electrically connected to the fourth docking terminal B2 via another wire (e.g., the second wire). This embodiment establishes an address signal transmission path between the charging module and the backplane through the aforementioned docking structure. It enables stable and reliable address identification using only two power supply signal pins, effectively reducing the number of signal pins, improving anti-interference capabilities and module identification accuracy, and simplifying the overall structure.

[0027] In an optional embodiment of this application, the control module includes a microcontroller.

[0028] Specifically, the microcontroller is used to read the input state of the DIP switch 202 and generate a control signal based on the input state to control the switching device S1 to turn on or off, thereby adjusting the connection state of the load resistor Rb and realizing the output of the address recognition signal.

[0029] For example, when a certain bit of the DIP switch 202 is set to a high level (ON state), the microcontroller controls the corresponding GPIO output to a high level according to this state, turning on the switching device, connecting the load resistor to the circuit, and forming a larger current path; correspondingly, the optocoupler in the charging module turns on due to the increased current and outputs a high-level signal; when the DIP switch is set to a low level (OFF state), the microcontroller outputs a low level, controls the switching device to turn off, disconnects the load resistor, reduces the current, cuts off the optocoupler, and outputs a low-level signal.

[0030] This implementation uses a microcontroller combined with a DIP switch to encode and output address information as a PWM pulse signal, achieving stable and accurate address identification signal transmission.

[0031] In an optional embodiment of this application, the optocoupler includes an optocoupler diode.

[0032] Specifically, the optocoupler diode is used to receive the current change caused by the PWM address recognition signal transmitted by the backplane circuit. When the current reaches the conduction threshold, the optocoupler diode conducts and outputs the corresponding level signal through its internal photosensitive receiver, thereby realizing the opto-isolated transmission of the address signal, thus improving the anti-interference capability of signal recognition and circuit security.

[0033] In optional embodiments of this application, the switching device includes at least one of the following: a transistor and a field-effect transistor.

[0034] Specifically, the switching device is used to turn on or off under the control signal output by the control module to control the connection state of the load resistor, thereby adjusting the current through the optocoupler in the charging module and generating an identification signal corresponding to the address information.

[0035] In an optional embodiment of this application, the switching device may be a transistor.

[0036] Specifically, the collector of the transistor is electrically connected to the other end of the load resistor Rb, the emitter of the transistor is grounded, and the base of the transistor is used to electrically connect to the DIP switch 202.

[0037] This implementation controls the conduction or cutoff of the transistor by controlling the base voltage state, thereby controlling whether the load resistor is connected to the circuit. When the transistor is on, a large current path is formed, driving the optocoupler in the charging module to conduct; when the transistor is off, the current is interrupted, the optocoupler is in the off state, and the address identification signal is effectively modulated and transmitted.

[0038] Please see Figure 2 The signal transmission circuit also includes a first diode D1.

[0039] Specifically, the cathode of the first diode D1 is electrically connected to one port 201A of the control module 201, and its anode is simultaneously electrically connected to the other end of the current-limiting resistor Ra, the other end of the optocoupler Z1, and one end of the load resistor Rb.

[0040] This embodiment achieves reverse voltage isolation protection for the output port 201A of the control module by setting the first diode D1. When the power is off or the system is abnormal, it can effectively prevent the control module from being interfered with or damaged by external return voltage, thereby improving the electrical safety and reliability of the system.

[0041] Please see Figure 3 The signal transmission circuit also includes a second diode D2.

[0042] Specifically, the cathode of the second diode D2 is electrically connected to one port 201A of the control module and one end of the load resistor Rb, while its anode is electrically connected to the other end of the current-limiting resistor Ra and the other end of the optocoupler Z1.

[0043] This implementation effectively prevents damage to the control module (such as a microcontroller) port due to external abnormal voltage or current backflow by using the second diode D2, thus improving the system's anti-interference capability and safety. Simultaneously, during PWM signal transmission, the second diode D2 also functions as a unidirectional conduction and signal direction control, ensuring that the control signal is transmitted only along a preset direction, thereby improving the accuracy and reliability of identification.

[0044] Please see Figure 4 The signal transmission circuit also includes a third diode, D3.

[0045] Specifically, the cathode of the third diode D3 is electrically connected to one end of the load resistor Rb, one port 201A of the control module, the other end of the current limiting resistor Ra, and the other end of the optocoupler Z1, while its anode is grounded.

[0046] This implementation utilizes a third diode, D3, which acts as a Zener diode to provide overvoltage protection for the Addr_5V signal line. When external interference or circuit malfunction causes a momentary voltage spike on the signal line exceeding the safe voltage, the third diode D3 conducts, quickly dissipating the abnormally high voltage to ground, thus preventing damage to the control module or peripheral circuits due to excessive voltage. Furthermore, this diode D3 can be a fast-response device such as a TVS (Transient Voltage Suppressor) or a Schottky diode to meet the stability and reliability requirements of high-speed PWM signal transmission. Through this protection mechanism, the overall surge protection, electrostatic discharge (ESD) immunity, and operational reliability of the system are significantly improved.

[0047] This application provides a signal transmission device, including a device body and a signal transmission circuit as described in the above embodiments, wherein the signal transmission circuit is disposed within the device body.

[0048] This application provides a charging pile, including a charging pile body and a signal transmission device as described in the above embodiment, wherein the signal transmission device is disposed on the charging pile body.

[0049] The signal transmission circuit, device, and charging pile of this application embodiment control the conduction state of the switching device through the control module in the backplane circuit to regulate the current in the load circuit, thereby causing the optocoupler in the charging module to generate conduction and cutoff states corresponding to the address information, realizing address signal transmission and recognition in PWM form. This technical solution does not require adding a complex communication interface to the charging module end, nor does it rely on precision-sensitive device parameter detection. It can achieve stable and reliable address recognition using only two power supply signal pins, effectively reducing the number of signal pins, improving anti-interference capability and module recognition accuracy, simplifying the overall structure, and is suitable for modular, highly integrated charging pile systems.

[0050] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A signal transmission circuit, characterized in that, Including the charging module and backplane circuitry; The charging module includes an optocoupler and a current-limiting resistor, and the backplane circuit includes a load resistor and a control module, the control module being electrically connected to a DIP switch; One end of the optocoupler and one end of the current-limiting resistor are both used to receive the power supply voltage. The other end of the optocoupler is simultaneously electrically connected to the other end of the current-limiting resistor, the control module, and one end of the load resistor. The other end of the load resistor is simultaneously electrically connected to the first end of the switching device in the control module, and the second end of the switching device is grounded. When the charging module is connected to the backplane circuit, the control module controls the switching device to be turned on or off according to the input state of the DIP switch to generate a corresponding PWM signal. The optocoupler is used to respond to the PWM signal and form identification information to indicate the PWM signal.

2. The signal transmission circuit as described in claim 1, characterized in that, The charging module forms a first docking terminal and a second docking terminal, and the backplane circuit forms a third docking terminal and a fourth docking terminal; The first terminal includes the other end of the optocoupler and the other end of the current-limiting resistor, and the second terminal is used for grounding; The third terminal includes the output port of the control module and one end of the load resistor, and the fourth terminal includes the second end of the switching device; The first docking end is electrically connected to the third docking end via a wire, and the second docking end is electrically connected to the fourth docking end via another wire.

3. The signal transmission circuit as described in claim 2, characterized in that, When the switching device is turned on, the load resistor in the backplane circuit and the supply voltage form a loop, causing the optocoupler in the charging module to turn on, thereby generating a high-level identification signal; When the switching device is turned off, the circuit is interrupted, and the optocoupler is turned off to generate a low-level identification signal.

4. The signal transmission circuit as described in claim 3, characterized in that, The signal transmission circuit also includes a first diode; The cathode of the first diode is electrically connected to one port of the control module, and the anode of the first diode is simultaneously electrically connected to the other end of the current-limiting resistor, the other end of the optocoupler, and one end of the load resistor.

5. The signal transmission circuit as described in claim 3, characterized in that, The signal transmission circuit also includes a second diode; The cathode of the second diode is electrically connected to one port of the control module and one end of the load resistor, while the anode of the second diode is electrically connected to the other end of the current-limiting resistor and the other end of the optocoupler.

6. The signal transmission circuit as described in claim 3, characterized in that, The switching device includes at least one of the following: transistor, field-effect transistor.

7. The signal transmission circuit as described in claim 3, characterized in that, The switching device is a transistor; The collector of the transistor is electrically connected to the other end of the load resistor, the emitter of the transistor is grounded, and the base of the transistor is electrically connected to the DIP switch.

8. The signal transmission circuit as described in claim 3, characterized in that, The signal transmission circuit also includes a third diode; The cathode of the third diode is electrically connected to one end of the load resistor, one port of the control module, the other end of the current limiting resistor, and the other end of the optocoupler, while the anode of the third diode is grounded.

9. A signal transmission device, characterized in that, It includes a device body and a signal transmission circuit as described in any one of claims 1 to 8; the signal transmission circuit is disposed on the device body.

10. A charging pile, characterized in that, It includes a charging pile body and a signal transmission device as described in claim 9, wherein the signal transmission device is disposed on the charging pile body.

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