Communication signal identification circuit

Abstract

A communication signal identification circuit is disclosed for identifying input signals as either DALI or RDM / DMX512 communication signals using a single interface. The circuit utilizes a first decoding module and a second decoding module to independently decode the DALI and RDM / DMX512 communication signals, respectively. The circuit employs a level protection module to clamp high-level DALI communication signals, preventing damage to subsequent circuits, while simultaneously ensuring stable transmission of RDM / DMX512 communication signals to the second decoding module. Therefore, this communication signal identification circuit achieves compatibility with both DALI and RDM / DMX512 dimming protocols with different electrical specifications on a single interface, effectively reducing wiring complexity, lowering the risk of misconnection, significantly reducing hardware failure rates, and improving the applicability and reliability of the lighting system in various dimming protocol environments.

Description

Technical Field

[0001] This case relates to the field of communication technology, and in particular to a communication signal identification circuit. Background Technology

[0002] Among existing lighting power supply dimming protocols, the main ones include DALI dimming protocol and RDM (or DMX512) dimming protocol. Each is suitable for different application scenarios. However, the electrical specifications corresponding to these two dimming protocols have significantly different allowable voltage ranges for their interfaces. Specifically, the DALI dimming protocol has a high-level range of 9.5V to 22.5V and a low-level range of -6.5V to 6.5V; while the RDM dimming protocol's high and low level ranges are between -6V and 6V. Due to this incompatibility in voltage levels, lighting power supply systems cannot simultaneously identify the communication signals corresponding to these two dimming protocols through a single dimming interface. Multiple dimming interfaces must be set up for separate processing, which increases the number of wires required and increases the risk of incorrect wiring by users, potentially leading to interface damage or system failure.

[0003] Therefore, it is necessary to develop a communication signal identification circuit to solve the problems faced by previous technologies. Utility Model Content

[0004] The purpose of this invention is to provide a communication signal identification circuit for identifying input signals as either DALI or RDM / DMX512 communication signals under a single dimming interface, thereby resolving interface incompatibility issues caused by differences in electrical specifications. This communication signal identification circuit uses a first decoding module and a second decoding module to decode DALI and RDM / DMX512 communication signals respectively; and works in conjunction with a level protection module to clamp the input signal voltage, preventing high-level DALI communication signals from damaging subsequent circuits, while ensuring the normal passage of RDM / DMX512 communication signals. Therefore, this communication signal identification circuit achieves compatibility with two dimming protocols with different electrical specifications on a single interface, effectively reducing the number of wires, lowering the risk of hardware damage due to incorrect wiring, and improving the applicability and reliability of the lighting system in various dimming protocol scenarios.

[0005] To achieve the above objectives, this invention provides a communication signal identification circuit for distinguishing a received input signal as a first communication signal or a second communication signal, wherein the first communication signal is a DALI communication signal, and the second communication signal is an RDM communication signal or a DMX512 communication signal. The communication signal identification circuit includes: a first input terminal, a second input terminal, a first decoding module, a level protection module, a second decoding module, a reference level conversion module, an isolation module, and a signal identification module. The first and second input terminals are used to receive the input signal. The first decoding module is electrically coupled to the first and second input terminals and is used to decode the input signal according to the protocol of the first communication signal to output a first decoded signal. The level protection module is electrically coupled to the first and second input terminals and is used to voltage clamp the input signal and output a voltage clamp signal. The second decoding module is electrically coupled to the output terminal of the level protection module and is used to decode the voltage clamp signal according to the protocol of the second communication signal to output a second decoded signal. A reference level conversion module is electrically coupled to the first input terminal, the second input terminal, the level protection module, and the second decoding module to provide a reference potential to the level protection module and the second decoding module. An isolation module is electrically coupled to the output terminals of the first and second decoding modules to receive the first or second decoded signal and output an output signal. A signal identification module is electrically coupled to the output terminal of the isolation module to determine the baud rate based on the output signal baud rate of the isolation module: when the baud rate of the isolation module's output signal matches the preset baud rate of the first communication signal, the input signal received by the communication signal identification circuit is determined to be the first communication signal; when the baud rate of the isolation module's output signal matches the preset baud rate of the second communication signal, the input signal received by the communication signal identification circuit is determined to be the second communication signal.

[0006] In some embodiments, when the input signal is the first communication signal, the first decoding module successfully decodes the first communication signal and outputs the first decoded signal, the level protection module performs voltage clamping on the first communication signal and outputs the voltage clamping signal, and the second decoding module fails to decode the voltage clamping signal and continuously outputs a high level.

[0007] In some embodiments, when the input signal is the second communication signal, the first decoding module fails to decode the second communication signal and continuously outputs a low level. The level protection module performs voltage clamping on the second communication signal and outputs the voltage clamping signal. The second decoding module successfully decodes the voltage clamping signal and outputs the second decoded signal.

[0008] In some embodiments, the level protection module includes a first switch, a second switch, a first resistor, and a second resistor. The drain of the first switch is electrically coupled to the first input terminal, the source of the first switch is electrically coupled to a first terminal of the second decoding module and a first terminal of the first resistor, the gate of the first switch is electrically coupled to a second terminal of the first resistor and a first power supply terminal, the drain of the second switch is electrically coupled to the second input terminal, the source of the second switch is electrically coupled to a second terminal of the second decoding module and a first terminal of the second resistor, and the gate of the second switch is electrically coupled to the first power supply terminal and a second terminal of the second resistor.

[0009] In some embodiments, the communication signal identification circuit further includes a third input terminal electrically coupled to a ground terminal, and the reference level conversion module includes a rectifier bridge and a third resistor. A first terminal of the rectifier bridge is electrically coupled to the first input terminal and the drain of the first switching transistor, a second terminal of the rectifier bridge is electrically coupled to the second input terminal and the drain of the second switching transistor, a third terminal of the rectifier bridge is electrically coupled to a first terminal of the third resistor, and a fourth terminal of the rectifier bridge is electrically coupled to the third input terminal, a second terminal of the third resistor, and a third terminal of the second decoding module.

[0010] In some embodiments, the reference level conversion module determines the lower of the potential at the first input terminal and the potential at the second input terminal as the reference potential.

[0011] In some embodiments, the first decoding module includes a fourth resistor, a fifth resistor, a sixth resistor, a third switch, a first optocoupler, and a second optocoupler. The first terminal of the fourth resistor is electrically coupled to the third terminal of the rectifier bridge and the source of the third switch. The second terminal of the fourth resistor is electrically coupled to a first positive input terminal of the first optocoupler. The drain of the third switch is electrically coupled to the fourth terminal of the rectifier bridge. The gate of the third switch is electrically coupled to a second negative output terminal of the second optocoupler. The first optocoupler... The first negative input terminal of the first optocoupler is electrically coupled to the second positive output terminal of the second optocoupler and the fourth terminal of the rectifier bridge. The first positive output terminal of the first optocoupler is electrically coupled to the first terminal of the fifth resistor and one input terminal of the isolation module. The second terminal of the fifth resistor is electrically coupled to a second power supply terminal. The second positive input terminal of the second optocoupler is electrically coupled to the second power supply terminal. The second negative input terminal of the second optocoupler is electrically coupled to the first terminal of the sixth resistor. The second terminal of the sixth resistor is electrically coupled to the other input terminal of the isolation module.

[0012] In some embodiments, the level protection module includes a first switch, a second switch, a first resistor, and a second resistor; the reference level conversion module includes a third resistor; the drain of the first switch is electrically coupled to the first input terminal; the source of the first switch is electrically coupled to a first terminal of the second decoding module and a first terminal of the first resistor; the gate of the first switch is electrically coupled to a second terminal of the first resistor and a first power supply terminal; the drain of the second switch is electrically coupled to the second input terminal; the source of the second switch is electrically coupled to a second terminal of the second decoding module, a first terminal of the second resistor, and a first terminal of the third resistor; the gate of the second switch is electrically coupled to the first power supply terminal and a second terminal of the second resistor; and the second terminal of the third resistor is electrically coupled to a ground terminal.

[0013] In some embodiments, the reference level conversion module determines the potential of the second input terminal as the reference potential.

[0014] In some embodiments, the second decoding module includes a decoding chip, a first terminal of the decoding chip being electrically coupled to the first terminal of the second decoding module, a second terminal of the decoding chip being electrically coupled to the second terminal of the second decoding module, and a third terminal of the decoding chip being electrically coupled to the ground terminal.

[0015] In some embodiments, when the potential of the first input terminal is greater than the potential of the first power supply terminal, the first switch is turned off, and the output signal of the decoding chip is a high-level signal; when the potential of the first input terminal is less than the potential of the first power supply terminal, the first switch is turned on, and the output signal of the decoding chip is a low-level signal.

[0016] In some embodiments, the first decoding module includes a rectifier bridge, a fourth resistor, a fifth resistor, a sixth resistor, a third switch, a first optocoupler, and a second optocoupler. A first terminal of the rectifier bridge is electrically coupled to the first input terminal, a second terminal of the rectifier bridge is electrically coupled to the second input terminal, a first terminal of the fourth resistor is electrically coupled to a third terminal of the rectifier bridge and the source of the third switch, a second terminal of the fourth resistor is electrically coupled to a first positive input terminal of the first optocoupler, the drain of the third switch is electrically coupled to a fourth terminal of the rectifier bridge, and the gate of the third switch is electrically coupled to... The second output negative terminal of the second optocoupler is electrically coupled to the first input negative terminal of the first optocoupler, which is connected to the second output positive terminal of the second optocoupler and the fourth terminal of the rectifier bridge. The first output positive terminal of the first optocoupler is electrically coupled to the first terminal of the fifth resistor and one input terminal of the isolation module. The second terminal of the fifth resistor is electrically coupled to a second power supply terminal. The second input positive terminal of the second optocoupler is electrically coupled to the second power supply terminal. The second input negative terminal of the second optocoupler is electrically coupled to the first terminal of the sixth resistor. The second terminal of the sixth resistor is electrically coupled to the other input terminal of the isolation module.

[0017] In some embodiments, the isolation module includes an optocoupler.

[0018] In some embodiments, the signal recognition module includes a microcontroller for determining whether the input signal is the first communication signal or the second communication signal. Attached Figure Description

[0019] Figure 1 This is a block topology diagram of the communication signal identification circuit in the first embodiment of this case.

[0020] Figure 2 for Figure 1 A detailed topology diagram of one embodiment of the level protection module and reference level conversion module of the communication signal identification circuit shown.

[0021] Figure 3 for Figure 1 A detailed topology diagram of another embodiment of the level protection module and reference level conversion module of the communication signal identification circuit shown.

[0022] Figure 4 for Figure 1 A detailed topology diagram of an embodiment of the first decoding module of the communication signal identification circuit shown.

[0023] Figure 5 for Figure 1 A detailed topology diagram of another embodiment of the first decoding module of the communication signal identification circuit shown.

[0024] List of reference numerals

[0025] 1: Communication signal identification circuit

[0026] 21: First input terminal

[0027] 22: Second input terminal

[0028] 23: Third input terminal

[0029] 3, 3a: First decoding module

[0030] R4: Fourth resistor

[0031] R5: Fifth resistor

[0032] R6: Sixth resistor

[0033] Q3: Third switching transistor

[0034] 31: First optocoupler device

[0035] 31a: First positive input terminal

[0036] 31b: First input negative terminal

[0037] 31c: First output positive terminal

[0038] 31d: First output negative terminal

[0039] 32: Second optocoupler device

[0040] 32a: Second input positive terminal

[0041] 32b: Second input negative terminal

[0042] 32c: Second output positive terminal

[0043] 32d: Second output negative terminal

[0044] 33: Rectifier Bridge

[0045] 33a: First end

[0046] 33b: Second end

[0047] 33c: Third end

[0048] 33d: Fourth end

[0049] 4: Level Protection Module

[0050] Q1: First switching transistor

[0051] Q2: Second switching transistor

[0052] R1: First resistor

[0053] R2: Second resistor

[0054] 5: Second decoding module

[0055] 51: First end

[0056] 52: Second end

[0057] 53: Third end

[0058] 54: Decoding chip

[0059] 54a: First end

[0060] 54b: Second end

[0061] 54c: Third end

[0062] 6, 6a: Reference level conversion module

[0063] 61: Rectifier Bridge

[0064] 61a: First end

[0065] 61b: Second end

[0066] 61c: Third end

[0067] 61d: Fourth end

[0068] R3: Third resistor

[0069] 7: Isolation Module

[0070] 8: Signal Recognition Module

[0071] 91: First power supply terminal

[0072] 92: Second power supply terminal Detailed Implementation

[0073] Some typical embodiments that embody the features and advantages of this invention will be described in detail in the following description. It should be understood that this invention can have various variations in different forms, all of which do not depart from the scope of this invention, and the descriptions and drawings therein are for illustrative purposes only and not for limiting this invention.

[0074] For example, different embodiments in this case may use repeated reference numerals and / or markings. These repetitions are for simplification and clarity and are not intended to limit the relationships between the various embodiments and / or the described appearance structures. Furthermore, when a component is referred to as "connected to" or "coupled to" another component, it may be directly connected to or coupled to the other component, or there may be intervening components. Additionally, it is understood that although terms such as "first," "second," and "third" may be used in the claims to describe different components, these components should not be limited by these terms, and the components described accordingly in the embodiments are represented by different component symbols. These terms are used to distinguish different components. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component without departing from the scope of the embodiments. The term "and / or" as thus used includes any or all combinations of one or more of the related listed items. Some embodiments of this case are described in detail below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0075] Please see Figure 1 This is a block topology diagram of the communication signal identification circuit in the first embodiment of this case. As shown in the figure, the communication signal identification circuit 1 in this embodiment is used to receive input signals and distinguish whether the received input signal is a first communication signal or a second communication signal. In other words, the input signal received by the communication signal identification circuit 1 is only one of the first communication signal or the second communication signal. In this embodiment, the first communication signal is a DALI communication signal (Digital Addressable Lighting Interface), and the second communication signal is an RDM communication signal (Remote Device Management) or a DMX512 communication signal (Digital Multiplex 512). It should be noted that for RDM communication signals or DMX512 communication signals, since they are differential signals derived from the RS485 protocol, according to the protocol requirements, a three-wire connection (positive input terminal, negative input terminal, and ground terminal) is required. However, in practical applications, a two-wire connection (positive input terminal and negative input terminal) is often used. Given the two different connection methods of RDM communication signals and DMX512 communication signals, the communication signal identification circuit in this case can distinguish whether the input signal is a DALI communication signal or an RDM / DMX512 communication signal, while taking into account both different connection methods of RDM / DMX512 communication signals.

[0076] In this embodiment, the communication signal identification circuit 1 includes a first input terminal 21, a second input terminal 22, a first decoding module 3, a level protection module 4, a second decoding module 5, a reference level conversion module 6, an isolation module 7, and a signal identification module 8. The communication signal identification circuit 1 receives input signals via the first input terminal 21 and the second input terminal 22, wherein the input signal is either a first communication signal or a second communication signal. The first decoding module 3 is electrically coupled to the first input terminal 21 and the second input terminal 22. The first decoding module 3 is used to decode the input signal according to the protocol of the first communication signal to output a first decoded signal, wherein the first decoded signal is a high / low level signal, for example, a high / low level signal between 0V and 5V. In other words, the first decoding module 3 can only decode the first communication signal (i.e., the DALI communication signal). Therefore, when the input signal is the first communication signal, the first decoding module 3 successfully decodes the input signal and outputs the first decoded signal. However, when the input signal is the second communication signal, the first decoding module 3 fails to decode the input signal and continuously outputs a low level. Correspondingly, the signal recognition module 8 cannot obtain information related to the baud rate of the input signal from this low level.

[0077] The level protection module 4 is electrically coupled to the first input terminal 21 and the second input terminal 22. The level protection module 4 is used to clamp the input signal to output a voltage clamp signal. It should be noted that the level protection module clamps the input signal to the power supply voltage of the second decoding module 5. The second decoding module 5 is electrically coupled to the output terminal of the level protection module 4 and is used to decode the voltage clamp signal according to the protocol of the second communication signal to output a second decoded signal, which is a high / low level signal, for example, a high / low level signal between 0V and 5V. In other words, the second decoding module 5 can only decode the second communication signal (i.e., the RDM communication signal or the DMX512 communication signal) or its variant signal (the corresponding voltage clamping signal). Therefore, when the input signal is the second communication signal, the second decoding module 5 successfully decodes the voltage clamping signal at this time and outputs the second decoded signal; however, when the input signal is the first communication signal, the second decoding module 5 fails to decode the voltage clamping signal at this time and continuously outputs a high level. Correspondingly, the signal recognition module 8 cannot obtain information related to the baud rate of the signal from this high level.

[0078] The reference level conversion module 6 is electrically coupled to the first input terminal 21, the second input terminal 22, the level protection module 4, and the second decoding module 5, and is used to provide a reference potential to the level protection module 4 and the second decoding module 5. The selection method of the reference potential will be described later. The isolation module 7 is electrically coupled to the output terminal of the first decoding module 3 and the output terminal of the second decoding module 5, and is used to receive the first decoding signal or the second decoding signal to output an output signal. In one embodiment, the isolation module 7 may include an optocoupler.

[0079] The signal identification module 8 is electrically coupled to the output terminal of the isolation module 7 and includes a preset baud rate for a first communication signal and a preset baud rate for a second communication signal. The signal identification module 8 is used to determine whether the input signal received by the communication signal identification circuit 1 is the first communication signal when the baud rate of the output signal of the isolation module 7 matches the preset baud rate of the first communication signal; and when the baud rate of the output signal of the isolation module matches the preset baud rate of the second communication signal, the input signal received by the communication signal identification circuit 1 is determined to be the second communication signal. The RDM communication signal and the DMX512 communication signal have the same baud rate, and this is mainly used to distinguish whether the input signal is a DALI communication signal or an RDM communication signal, or whether the input signal is a DALI communication signal or a DMX512 communication signal. In one embodiment, the signal identification module 8 may include a microcontroller, and the Universal Asynchronous Receiver / Transmitter (UART) in the microcontroller is used to determine whether the input signal is the first communication signal or the second communication signal. It should be noted that only the first and second decoded signals, which are either high or low level, contain baud rate information that can be recognized by the signal recognition module. When the first decoding module 3 fails to decode, its continuously outputting low level does not contain the corresponding baud rate information. Similarly, when the second decoding module 5 fails to decode, its continuously outputting high level does not contain the corresponding baud rate information. Furthermore, the baud rate of DALI communication signals is generally 1200 bps, while the baud rate of RDM or DMX512 communication signals is generally 250 kbps.

[0080] As can be seen from the above, the communication signal identification circuit 1 in this case can decode the DALI communication signal and the RDM / DMX512 communication signal through the first decoding module 3 and the second decoding module 5 respectively; and in conjunction with the level protection module 4, it performs voltage clamping on the input signal to output a voltage clamping signal, blocking the high-level DALI communication signal from damaging the subsequent second decoding module 5, while ensuring that the RDM / DMX512 communication signal can pass normally. Therefore, the communication signal identification circuit 1 in this case achieves compatibility between two dimming protocols with different electrical specifications through a single dimming interface, effectively reducing the number of wires and lowering the risk of hardware damage caused by misconnection.

[0081] The wiring method and the selection of the corresponding reference potential will be further explained below. Please refer to [link / reference]. Figure 2 and cooperate Figure 1 ,in Figure 2 for Figure 1 The diagram shows a detailed topology of one embodiment of the level protection module and reference level conversion module of the communication signal identification circuit. In this embodiment, the communication signal identification circuit 1 may further include a third input terminal 23, electrically coupled to a ground terminal (not shown). That is, it is also an embodiment of the three-wire circuit architecture of the communication signal identification circuit 1 of this invention. Figure 2 As shown, the level protection module 4 in this embodiment includes a first switch Q1, a second switch Q2, a first resistor R1, and a second resistor R2. The drain of the first switch Q1 is electrically coupled to the first input terminal 21, the source of the first switch Q1 is electrically coupled to the first terminal 51 of the second decoding module 5 and the first terminal of the first resistor R1, and the gate of the first switch Q1 is electrically coupled to the second terminal of the first resistor R1 and the first power supply terminal 91, wherein the voltage of the first power supply terminal 91 can be 5V. The drain of the second switch Q2 is electrically coupled to the second input terminal 22, the source of the second switch Q2 is electrically coupled to the second terminal 52 of the second decoding module 5 and the first terminal of the second resistor R2, and the gate of the second switch Q2 is electrically coupled to the second terminal of the second resistor R2 and the first power supply terminal 91.

[0082] The reference level conversion module 6 includes a rectifier bridge 61 and a third resistor R3. The first terminal 61a of the rectifier bridge 61 is electrically coupled to the first input terminal 21 and the drain of the first switching transistor Q1. The second terminal 61b of the rectifier bridge 61 is electrically coupled to the second input terminal 22 and the drain of the second switching transistor Q2. The third terminal 61c of the rectifier bridge 61 is electrically coupled to the first terminal of the third resistor R3. The fourth terminal 61d of the rectifier bridge 61 is electrically coupled to the third input terminal 23, the second terminal of the third resistor R3, and the third terminal 53 of the second decoding module 5. In this embodiment, the rectifier bridge 61 includes four diodes. The anode of the first diode D1 is electrically coupled to the first terminal 61a of the rectifier bridge 61, and the cathode of the first diode D1 is electrically coupled to the third terminal 61c of the rectifier bridge 61. The anode of the second diode D2 is electrically coupled to the second terminal 61b of the rectifier bridge 61, and the cathode of the second diode D2 is electrically coupled to the third terminal 61c of the rectifier bridge 61. The anode of the third diode D3 is electrically coupled to the fourth terminal 61d of the rectifier bridge 61, and the cathode of the third diode D3 is electrically coupled to the second terminal 61b of the rectifier bridge 61. The anode of the fourth diode D4 is electrically coupled to the fourth terminal 61d of the rectifier bridge 61, and the cathode of the fourth diode D4 is electrically coupled to the first terminal 61a of the rectifier bridge 61.

[0083] Furthermore, in this scenario, the reference level conversion module 6 can select the potential (ground potential) of the third input terminal 23 as the reference potential, and the lower of the potentials of the first input terminal 21 and the second input terminal 22 is equal to this ground potential. In other words, the lower of the potentials of the first input terminal 21 and the second input terminal 22 can be used as the reference potential. The following detailed explanation uses the example where the potential of the second input terminal 22 is lower than the potential of the first input terminal 21. In this case, the potential of the second input terminal 22 is equal to the potential of the third input terminal 23, i.e., equal to the ground potential. Therefore, the reference level conversion module 6 will automatically stop working, and the level protection module 4 will clamp the input signal, clamping the potential of the first input terminal 21 to the potential of the power supply terminal of the second decoding module 5. The output voltage clamping signal is then transmitted to the second decoding module 5 for decoding, thereby preventing potential damage to the second decoding module 5 from the input signal.

[0084] In this embodiment, when the input signal is the first communication signal, the voltage clamping signal generated by the level protection module 4 after voltage clamping of the first communication signal enters the second decoding module 5. The second decoding module 5 fails to decode it and continuously outputs a high level. The subsequent signal identification module 8 cannot obtain the required baud rate information from this high level. However, the input signal can be successfully decoded by the first decoding module 3 after entering the first decoding module 3, and the first decoded signal is output. Then, the first decoded signal enters the signal identification module 8 through the isolation module 7. The signal identification module 8 compares the baud rate information obtained from the first decoded signal with its own stored baud rate information, and finally confirms that the input signal is the first communication signal. When the input signal is the second communication signal, since the voltage between the first input terminal 21 and the second input terminal 22 is less than 6V, the first decoding module 3 cannot recognize the signal and continuously outputs a low level after receiving the input signal. Subsequently, the subsequent signal identification module 8 cannot obtain the baud rate information of the input signal. However, after the input signal enters the level protection module 5, the level protection module 4 clamps the voltage and generates a voltage clamp signal. The second decoding module 5 successfully decodes the voltage clamp signal and generates a second decoded signal. The second decoded signal is transmitted to the signal identification module 8 by the isolation module 7. The signal identification module compares the baud rate information obtained from it with its own stored baud rate information and finally confirms that the input signal at this time is the second communication signal.

[0085] In this embodiment, the second decoding module 5 includes a decoding chip 54. The first terminal 54a of the decoding chip 54 is electrically coupled to the first terminal 51 of the second decoding module 5, the second terminal 54b of the decoding chip 54 is electrically coupled to the second terminal 52 of the second decoding module 5, and the third terminal 54c of the decoding chip 54 is electrically coupled to the third terminal 53 of the second decoding module 5, i.e., the third terminal 54c of the decoding chip 54 is electrically coupled to the ground terminal. When the potential of the first input terminal 21 is greater than the potential of the first power supply terminal 91, the first switch Q1 is turned off, and the decoding chip 54 outputs a high level; when the potential of the first input terminal 21 is less than the potential of the first power supply terminal 91, the first switch Q1 is turned on, and the decoding chip 54 outputs a low level.

[0086] In other embodiments, the third input terminal 23 can be omitted, thus constituting a two-wire connection embodiment of the communication signal identification circuit 1 of this invention. In this case, since there is no independent reference ground terminal, the reference level conversion module 6 needs to dynamically detect the real-time potentials of the first input terminal 21 and the second input terminal 22, and automatically select the lower potential as the reference potential for the level protection module 4 and the second decoding module 5 to ensure their normal operation. Therefore, the communication signal identification circuit 1 of this invention accommodates both two-wire and three-wire connection methods, eliminating the need for users to distinguish between wiring methods, reducing the risk of misconnection, avoiding communication failures due to inconsistent reference potentials, and improving system reliability.

[0087] Please see Figure 3 and cooperate Figure 1 ,in Figure 3 for Figure 1 The diagram shows a detailed topology of another embodiment of the level protection module and reference level conversion module of the communication signal identification circuit. In this embodiment, the communication signal identification circuit 1 includes only two input terminals, which is also another embodiment of the two-wire connection method of the communication signal identification circuit 1 of this invention. Figure 3 As shown, the level protection module 4 in this embodiment is similar to... Figure 2 The level protection module 4 shown will not be described in detail here. Compared to... Figure 2 The reference level conversion module 6 shown includes a rectifier bridge and a third resistor. In this embodiment, the reference level conversion module 6a only includes the third resistor R3. The first end of the third resistor R3 is electrically coupled to the source of the second switch Q2 and the first end of the second resistor R2, and the second end of the third resistor R3 is electrically coupled to ground. In this embodiment, the ratio between the third resistor R3 and the second resistor R2 can be adjusted as needed to keep the second switch Q2 in a normally on state, thereby determining the potential of the second input terminal 22 as the reference potential.

[0088] Please see Figure 4 and cooperate Figure 1 ,in Figure 4 for Figure 1The diagram shows a detailed topology of an embodiment of the first decoding module of the communication signal identification circuit. As shown, the first decoding module 3 receives electrical energy, for example 3.3V, provided by the second power supply terminal 92, and includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third switch Q3, a first optocoupler 31, and a second optocoupler 32. The first optocoupler 31 includes a first positive input terminal 31a, a first negative input terminal 31b, a first positive output terminal 31c, and a first negative output terminal 31d. The second optocoupler 32 includes a second positive input terminal 32a, a second negative input terminal 32b, a second positive output terminal 32c, and a second negative output terminal 32d. The first terminal of the fourth resistor R4 is electrically coupled to the third terminal 61c of the rectifier bridge 61 of the reference level conversion module 6 and the source of the third switch Q3. The second terminal of the fourth resistor R4 is electrically coupled to the first input positive terminal 31a of the first optocoupler 31. The drain of the third switch Q3 is electrically coupled to the fourth terminal 61d of the rectifier bridge 61 of the reference level conversion module 6. The gate of the third switch Q3 is electrically coupled to the second output negative terminal 32d of the second optocoupler 32. The first input negative terminal 31b of the first optocoupler 31 is electrically coupled to the second output terminal 32d of the second optocoupler 32. The positive terminal 32c and the fourth terminal 61d of the rectifier bridge 61 of the reference level conversion module 6 are electrically coupled to the first output positive terminal 31c of the first optocoupler 31, the first terminal of the fifth resistor R5, and one input terminal of the isolation module 7. The second terminal of the fifth resistor R5 is electrically coupled to the second power supply terminal 92. The second input positive terminal 32a of the second optocoupler 32 is electrically coupled to the second power supply terminal 92. The second input negative terminal 32b of the second optocoupler 32 is electrically coupled to the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 is electrically coupled to the other input terminal of the isolation module 7.

[0089] In one embodiment, the rectifier bridge may be located not only in the reference level conversion module, but also in the first decoding module. Please refer to [link to relevant documentation]. Figure 5 and cooperate Figure 1 ,in Figure 5 for Figure 1 A detailed topology diagram of another embodiment of the first decoding module of the communication signal identification circuit shown. As shown, compared to Figure 4 The first decoding module shown in this embodiment, 3a, includes a rectifier bridge 33, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third switch Q3, a first optocoupler 31, and a second optocoupler 32. The first terminal 33a of the rectifier bridge 33 is electrically coupled to the first input terminal 21, and the second terminal 33b of the rectifier bridge 33 is electrically coupled to the second input terminal 22. The fourth resistor R4, fifth resistor R5, sixth resistor R6, third switch Q3, first optocoupler 31, and second optocoupler 32 in this embodiment are similar to... Figure 4The corresponding components are not described here.

[0090] In summary, the communication signal identification circuit of this invention can identify input signals as either DALI or RDM / DMX512 communication signals under a single dimming interface, resolving interface incompatibility issues caused by differences in electrical specifications. The circuit decodes DALI and RDM / DMX512 communication signals using a first and second decoding module respectively, and employs a level protection module to clamp the input signal voltage, preventing high-level DALI communication signals from damaging downstream circuits while ensuring the normal passage of RDM / DMX512 communication signals. Therefore, the communication signal identification circuit achieves compatibility with two dimming protocols with different electrical specifications on a single interface, effectively reducing the number of wires, lowering the risk of hardware damage due to incorrect connections, and improving the applicability and reliability of the lighting system in various dimming protocol scenarios.

Claims

1. A communication signal identification circuit for distinguishing a received input signal as a first communication signal or a second communication signal, wherein the first communication signal is a DALI communication signal, and the second signal is an RDM communication signal or a DMX512 communication signal, characterized in that, The communication signal identification circuit includes: A first input terminal and a second input terminal are provided for receiving the input signal; A first decoding module is electrically coupled to the first input terminal and the second input terminal, and is used to decode the input signal according to the protocol of the first communication signal to output a first decoded signal; A voltage-level protection module is electrically coupled to the first input terminal and the second input terminal to perform voltage clamping on the input signal and output a voltage clamping signal. A second decoding module is electrically coupled to the output terminal of the level protection module to decode the voltage clamping signal according to the protocol of the second communication signal, so as to output a second decoding signal; A reference level conversion module is electrically coupled to the first input terminal, the second input terminal, the level protection module and the second decoding module, for providing a reference potential to the level protection module and the second decoding module; An isolation module is electrically coupled to the output terminal of the first decoding module and the output terminal of the second decoding module, for receiving the first decoding signal or the second decoding signal to output an output signal; as well as A signal identification module, electrically coupled to the output of the isolation module, is used to make a judgment based on the baud rate of the output signal of the isolation module. When the baud rate of the output signal of the isolation module matches the baud rate of the preset first communication signal, the input signal received by the communication signal identification circuit is determined to be the first communication signal. When the baud rate of the output signal of the isolation module matches the preset baud rate of the second communication signal, the input signal received by the communication signal identification circuit is determined to be the second communication signal.

2. The communication signal identification circuit as described in claim 1, characterized in that, When the input signal is the first communication signal, the first decoding module successfully decodes the first communication signal and outputs the first decoded signal. The level protection module performs voltage clamping on the first communication signal and outputs the voltage clamping signal. The second decoding module fails to decode the voltage clamping signal and continuously outputs a high level.

3. The communication signal identification circuit as described in claim 1, characterized in that, When the input signal is the second communication signal, the first decoding module fails to decode the second communication signal and continuously outputs a low level. The level protection module performs voltage clamping on the second communication signal and outputs the voltage clamping signal. The second decoding module successfully decodes the voltage clamping signal and outputs the second decoded signal.

4. The communication signal identification circuit as described in claim 1, characterized in that, The level protection module includes a first switching transistor, a second switching transistor, a first resistor, and a second resistor. The drain of the first switching transistor is electrically coupled to the first input terminal, the source of the first switching transistor is electrically coupled to a first terminal of the second decoding module and a first terminal of the first resistor, the gate of the first switching transistor is electrically coupled to a second terminal of the first resistor and a first power supply terminal, the drain of the second switching transistor is electrically coupled to the second input terminal, the source of the second switching transistor is electrically coupled to a second terminal of the second decoding module and a first terminal of the second resistor, and the gate of the second switching transistor is electrically coupled to the first power supply terminal and a second terminal of the second resistor.

5. The communication signal identification circuit as described in claim 4, characterized in that, The communication signal identification circuit also includes a third input terminal electrically coupled to a ground terminal, and the reference level conversion module includes a rectifier bridge and a third resistor. A first terminal of the rectifier bridge is electrically coupled to the first input terminal and the drain of the first switching transistor, a second terminal of the rectifier bridge is electrically coupled to the second input terminal and the drain of the second switching transistor, a third terminal of the rectifier bridge is electrically coupled to a first terminal of the third resistor, and a fourth terminal of the rectifier bridge is electrically coupled to the third input terminal, a second terminal of the third resistor, and a third terminal of the second decoding module.

6. The communication signal identification circuit as described in claim 5, characterized in that, The reference level conversion module determines the lower of the potential at the first input terminal and the potential at the second input terminal as the reference potential.

7. The communication signal identification circuit as described in claim 5, characterized in that, The first decoding module includes a fourth resistor, a fifth resistor, a sixth resistor, a third switch, a first optocoupler, and a second optocoupler. The first terminal of the fourth resistor is electrically coupled to the third terminal of the rectifier bridge and the source of the third switch. The second terminal of the fourth resistor is electrically coupled to a first positive input terminal of the first optocoupler. The drain of the third switch is electrically coupled to the fourth terminal of the rectifier bridge. The gate of the third switch is electrically coupled to a second negative output terminal of the second optocoupler. The first... The negative input terminal is electrically coupled to a second positive output terminal of the second optocoupler and the fourth terminal of the rectifier bridge. The positive output terminal of the first optocoupler is electrically coupled to a first terminal of the fifth resistor and an input terminal of the isolation module. The second terminal of the fifth resistor is electrically coupled to a second power supply terminal. The positive input terminal of the second optocoupler is electrically coupled to the second power supply terminal. The negative input terminal of the second optocoupler is electrically coupled to a first terminal of the sixth resistor. The second terminal of the sixth resistor is electrically coupled to another input terminal of the isolation module.

8. The communication signal identification circuit as described in claim 1, characterized in that, The level protection module includes a first switching transistor, a second switching transistor, a first resistor, and a second resistor. The reference level conversion module includes a third resistor. The drain of the first switching transistor is electrically coupled to the first input terminal. The source of the first switching transistor is electrically coupled to a first terminal of the second decoding module and a first terminal of the first resistor. The gate of the first switching transistor is electrically coupled to a second terminal of the first resistor and a first power supply terminal. The drain of the second switching transistor is electrically coupled to the second input terminal. The source of the second switching transistor is electrically coupled to a second terminal of the second decoding module, a first terminal of the second resistor, and a first terminal of the third resistor. The gate of the second switching transistor is electrically coupled to the first power supply terminal and a second terminal of the second resistor. The second terminal of the third resistor is electrically coupled to a ground terminal.

9. The communication signal identification circuit as described in claim 8, characterized in that, The reference level conversion module determines the potential of the second input terminal as the reference potential.

10. The communication signal identification circuit as described in claim 6 or 9, characterized in that, The second decoding module includes a decoding chip, a first terminal of which is electrically coupled to the first terminal of the second decoding module, a second terminal of which is electrically coupled to the second terminal of the second decoding module, and a third terminal of which is electrically coupled to the ground terminal.

11. The communication signal identification circuit as described in claim 10, characterized in that, When the potential of the first input terminal is greater than the potential of the first power supply terminal, the first switch is turned off, and the output signal of the decoding chip is a high-level signal. When the potential of the first input terminal is less than the potential of the first power supply terminal, the first switch is turned on, and the output signal of the decoding chip is a low-level signal.

12. The communication signal identification circuit as described in claim 8, characterized in that, The first decoding module includes a rectifier bridge, a fourth resistor, a fifth resistor, a sixth resistor, a third switch, a first optocoupler, and a second optocoupler. A first terminal of the rectifier bridge is electrically coupled to a first input terminal, and a second terminal of the rectifier bridge is electrically coupled to a second input terminal. A first terminal of the fourth resistor is electrically coupled to a third terminal of the rectifier bridge and the source of the third switch. A second terminal of the fourth resistor is electrically coupled to a first positive input terminal of the first optocoupler. The drain of the third switch is electrically coupled to a fourth terminal of the rectifier bridge, and the gate of the third switch is electrically coupled to the second optocoupler. The first optocoupler has a second negative output terminal, and a first negative input terminal is electrically coupled to a second positive output terminal of the second optocoupler and the fourth terminal of the rectifier bridge. The first positive output terminal of the first optocoupler is electrically coupled to a first terminal of the fifth resistor and an input terminal of the isolation module. The second terminal of the fifth resistor is electrically coupled to a second power supply terminal. The second positive input terminal of the second optocoupler is electrically coupled to the second power supply terminal. The second negative input terminal of the second optocoupler is electrically coupled to a first terminal of the sixth resistor. The second terminal of the sixth resistor is electrically coupled to another input terminal of the isolation module.

13. The communication signal identification circuit as described in claim 1, characterized in that, The isolation module contains optocouplers.

14. The communication signal identification circuit as described in claim 1, characterized in that, The signal recognition module includes a microcontroller for determining whether the input signal is the first communication signal or the second communication signal.

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