Signal processing circuit, PCB (Printed Circuit Board) and iron shell type DALI (Digital Addressable Lighting Interface) power supply

Abstract

The utility model discloses a signal processing circuit, PCB and iron shell type DALI power supply, the signal processing circuit comprises a signal isolation unit and a control unit, the signal isolation unit comprises an overvoltage protection part, a first control chip U1 and an isolation part, the input end of the overvoltage protection part is used for obtaining a DALI signal, and the input end of the first control chip U1 is used for receiving the DALI signal; an output end of the overvoltage protection part is connected with a pin DRAIN and a pin HV of the first control chip U1, a pin TX and a pin RX of the first control chip U1 are respectively connected with a first communication end of the isolation part, and a second communication end of the isolation part is connected with a communication end of the control unit. The output end of the control unit is used for outputting a control signal to a driving board of the iron shell type DALI power supply; according to the signal processing circuit disclosed by the invention, electrical isolation of the DALI signal and the control unit is realized by arranging the signal isolation unit, so that the anti-interference capability and the safety of the circuit are remarkably improved; and the overvoltage protection part provides reliable protection for the DALI signal, and prevents circuit elements from being damaged by overhigh voltage.

Description

Technical Field

[0001] This utility model relates to the field of driving power supply technology, and in particular to a signal processing circuit, PCB board and iron-cased DALI power supply. Background Technology

[0002] At the user end, when the number of load lamps reaches or exceeds 32, the voltage on the DALI bus will fluctuate significantly. This fluctuation will directly affect the input lines of each DALI driver. Since the DALI driver plays a key role in maintaining the stability of the lighting system, its input devices must be able to withstand stable voltage signals. However, when the voltage fluctuation exceeds the normal range, some input devices of the DALI driver may be damaged because they cannot adapt to such fluctuations, thereby affecting the stable operation of the entire lighting system.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a signal processing circuit with the advantages of strong anti-interference ability, high security, high data processing efficiency and flexible control.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A signal processing circuit includes a signal isolation unit and a control unit. The signal isolation unit includes an overvoltage protection section, a first control chip U1, and an isolation section. The input terminal of the overvoltage protection section is used to acquire a DALI signal. The output terminal of the overvoltage protection section is connected to the DRAIN and HV pins of the first control chip U1. The TX and RX pins of the first control chip U1 are respectively connected to the first communication terminal of the isolation section. The second communication terminal of the isolation section is connected to the communication terminal of the control unit. The output terminal of the control unit is used to output a control signal to the driver board of a metal-cased DALI power supply.

[0007] In the signal processing circuit, the isolation section includes a first isolation group and a second isolation group. The pins TX and RX of the first control chip U1 are respectively connected to the receiving end of the first isolation group and the transmitting end of the second isolation group. The transmitting end of the first isolation group and the receiving end of the second isolation group are respectively connected to the communication end of the control unit.

[0008] In the signal processing circuit, the signal isolation unit further includes a rectifier and a power control unit. The output terminal of the overvoltage protection unit is connected to the input terminal of the rectifier. The output terminal of the rectifier is connected to the input terminal of the power control unit, the DRAIN pin and the HV pin of the first control chip U1, respectively. The output terminal of the power control unit is connected to the input terminal of the second isolation group.

[0009] In the signal processing circuit, the signal isolation unit further includes a voltage regulator. The input terminal of the power control unit and the negative terminal of the voltage regulator are respectively connected to the pin VS of the first control chip U1, and the positive terminal of the voltage regulator is grounded.

[0010] In the signal processing circuit, the voltage regulator section includes a third Zener diode ZD3. The negative terminal of the third Zener diode ZD3 is connected to the pin VS of the first control chip U1, and the positive terminal of the third Zener diode ZD3 is grounded.

[0011] In the signal processing circuit, the power control unit includes a power transistor Q1, a sixty-fourth resistor R64, a fifty-seventh resistor R57, and a fifty-ninth resistor R59. The DRAIN pin of the power transistor Q1 is connected to the output terminal of the rectifier unit and the sixty-fourth resistor R64. The other end of the sixty-fourth resistor R64 is connected to the VS pin of the first control chip U1 through the fifty-seventh resistor R57. The CS pin of the power transistor Q1 is connected to the input terminal of the second isolation group through the fifty-ninth resistor R59.

[0012] In the signal processing circuit, the overvoltage protection unit includes a first fusible resistor FR1, a second fusible resistor FR2, a second varistor VR2, and a third varistor VR3. One end of the first fusible resistor FR1 is used to acquire the DALI signal, and the other end of the first fusible resistor FR1 is connected to one end of the second varistor VR2, one end of the third varistor VR3, and the input terminal of the rectifier unit, respectively. One end of the second fusible resistor FR2 is connected to the other end of the second varistor VR2, and the other ends of the second fusible resistor FR2 and the third varistor VR3 are respectively connected to the input terminal of the rectifier unit.

[0013] The signal processing circuit further includes a near-field communication unit, the input of which is used to acquire wireless input signals, and the output of which is connected to the input of the control unit.

[0014] This utility model also provides a PCB board on which the signal processing circuits described above are printed.

[0015] This utility model also provides a metal-cased DALI power supply, wherein the metal-cased DALI power supply uses any of the signal processing circuits described above to achieve operation control.

[0016] Beneficial effects:

[0017] This utility model provides a signal processing circuit that achieves electrical isolation between the DALI signal and the control unit by setting a signal isolation unit, which significantly improves the circuit's anti-interference capability and safety. The overvoltage protection unit provides reliable protection for the DALI signal. When the input signal voltage exceeds the preset threshold, the overvoltage protection unit can respond quickly, cut off or limit the excessive voltage from entering the subsequent circuit, thereby protecting the first control chip U1 and other circuit components from damage. Attached Figure Description

[0018] Figure 1 A circuit block diagram of the signal processing circuit provided by this utility model;

[0019] Figure 2 Circuit diagram of the signal isolation unit provided by this utility model;

[0020] Figure 3 The circuit schematic diagram of the control unit provided by this utility model;

[0021] Figure 4 The circuit schematic diagram of the near-field communication unit provided by this utility model.

[0022] Explanation of key component symbols: 1-Signal isolation unit, 11-Overvoltage protection unit, 12-Isolation unit, 13-Rectifier unit, 14-Power control unit, 15-Voltage regulator unit, 2-Control unit, 3-Near-field communication unit. Detailed Implementation

[0023] This utility model provides a signal processing circuit, a PCB board, and a metal-cased DALI power supply. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples.

[0024] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Please see Figures 1 to 4This utility model provides a signal processing circuit, including a signal isolation unit 1 and a control unit 2. The signal isolation unit 1 includes an overvoltage protection section 11, a first control chip U1, and an isolation section 12. The input terminal of the overvoltage protection section 11 is used to acquire DALI signals. The output terminal of the overvoltage protection section 11 is connected to the DRAIN and HV pins of the first control chip U1. The TX and RX pins of the first control chip U1 are respectively connected to the first communication terminal of the isolation section 12. The second communication terminal of the isolation section 12 is connected to the communication terminal of the control unit 2. The output terminal of the control unit 2 is used to output control signals to the driver board of the iron-cased DALI power supply.

[0026] The signal processing circuit disclosed in this application achieves electrical isolation between the DALI signal and the control unit 2 by setting a signal isolation unit 1, which significantly improves the circuit's anti-interference capability and safety. Especially in complex electromagnetic environments, this isolation design can prevent external interference signals from affecting the control unit 2 and ensure the stable operation of the circuit. The overvoltage protection unit 11 provides reliable protection for the DALI signal. When the input signal voltage exceeds a preset threshold, the overvoltage protection unit 11 can respond quickly, cut off or limit the excessive voltage from entering the subsequent circuit, thereby protecting the first control chip U1 and other circuit components from damage.

[0027] In this embodiment, the first control chip U1 is model BP5016.

[0028] Further, please refer to Figure 1 and Figure 2 The isolation unit 12 includes a first isolation group and a second isolation group. The pins TX and RX of the first control chip U1 are respectively connected to the receiving end of the first isolation group and the transmitting end of the second isolation group. The transmitting end of the first isolation group and the receiving end of the second isolation group are respectively connected to the communication end of the control unit 2.

[0029] In this embodiment, please refer to Figure 2The first isolation group includes a first optocoupler B1 and a 28th resistor R28. The second isolation group includes a second optocoupler B2, a 29th resistor R29, and a 12th capacitor C12. The receiving end of the first optocoupler B1 is connected to pin TX of the first control chip U1. The transmitting end of the first optocoupler B1 is connected to pin PA8 of the second control chip U2 included in the control unit 2 through the 28th resistor R28. The transmitting end of the second optocoupler B2 is connected to pin RX of the first control chip U1 and the output end of the power control unit 14, respectively. The receiving end of the second optocoupler B2 is connected to an external 3.3V DC power supply device, one end of the 12th capacitor C12, and pins PA3 and PA4 of the second control chip U2, respectively, through the 29th resistor R29. The other end of the 12th capacitor C12 is grounded.

[0030] In this embodiment, the isolation unit 12 includes a first isolation group and a second isolation group, which not only realizes isolated signal transmission and effectively avoids signal interference, but also improves the signal transmission quality and the overall performance of the system through fine circuit design. For example, the cooperation between the twenty-ninth resistor R29 and the twelfth capacitor C12 provides a stable power supply and filtering effect for the second optocoupler B2, further improving the signal transmission quality and the performance of the system.

[0031] Further, please refer to Figure 1 and Figure 2 The signal isolation unit 1 further includes a rectifier 13 and a power control unit 14. The output terminal of the overvoltage protection unit 11 is connected to the input terminal of the rectifier 13. The output terminal of the rectifier 13 is connected to the input terminal of the power control unit 14, the DRAIN pin and the HV pin of the first control chip U1, respectively. The output terminal of the power control unit 14 is connected to the input terminal of the second isolation group.

[0032] Further, please refer to Figure 1 and Figure 2 The signal isolation unit 1 further includes a voltage regulator 15. The input terminal of the power control unit 14 and the negative terminal of the voltage regulator 15 are respectively connected to the pin VS of the first control chip U1, and the positive terminal of the voltage regulator 15 is grounded.

[0033] Further, please refer to Figure 2 The voltage regulator 15 includes a third voltage regulator ZD3. The negative terminal of the third voltage regulator ZD3 is connected to the pin VS of the first control chip U1, and the positive terminal of the third voltage regulator ZD3 is grounded.

[0034] In this embodiment, by setting a third Zener diode ZD3, it is ensured that the circuit will not be broken down due to excessively high voltage when facing abnormal voltage fluctuations, thereby protecting the stability and safety of the entire signal processing circuit during operation.

[0035] Further, please refer to Figure 2 The power control unit 14 includes a power transistor Q1, a sixty-fourth resistor R64, a fifty-seventh resistor R57, and a fifty-ninth resistor R59. The DRAIN pin of the power transistor Q1 is connected to the output terminal of the rectifier unit 13 and the sixty-fourth resistor R64. The other end of the sixty-fourth resistor R64 is connected to the VS pin of the first control chip U1 through the fifty-seventh resistor R57. The CS pin of the power transistor Q1 is connected to the input terminal of the second isolation group through the fifty-ninth resistor R59.

[0036] In this embodiment, the power transistor Q1 is model BP5113JA.

[0037] Further, please refer to Figure 2 The rectifier section 13 includes a rectifier bridge BD1. The input terminals of the rectifier bridge BD1 are connected to the third varistor VR3 and the second fusible resistor FR2, respectively. The output terminals of the rectifier bridge BD1 are connected to the DRAIN pin of the power transistor Q1 and the DRAIN and HV pins of the first control chip U1, respectively.

[0038] In this embodiment, the power control unit 14, composed of power transistor Q1, sixty-fourth resistor R64, fifty-seventh resistor R57 and fifty-ninth resistor R59, realizes precise control of the output power of rectifier unit 13; wherein, the DRAIN pin of power transistor Q1 is connected to the output terminal of rectifier unit 13 and sixty-fourth resistor R64, ensuring that the rectified power can be stably input into power transistor Q1. The combined use of resistors R64 (sixty-fourth) and R57 (fifty-seventh) enables the operating state of power transistor Q1 to be monitored and adjusted in real time by the first control chip U1, thereby ensuring the stability and reliability of the entire circuit. Furthermore, the rectifier section 13 adopts a rectifier bridge BD1, whose input terminals are connected to the third varistor VR3 and the second fusible resistor FR2, respectively, effectively improving the circuit's resistance to lightning strikes and overcurrent protection. The output terminals of the rectifier bridge BD1 are connected to the DRAIN pin of power transistor Q1 and the DRAIN and HV pins of the first control chip U1, respectively, which not only realizes the rectification and filtering of electrical energy, but also provides a stable power input for the first control chip U1, ensuring the normal operation of the chip.

[0039] Further, please refer to Figure 2The overvoltage protection unit 11 includes a first fusible resistor FR1, a second fusible resistor FR2, a second varistor VR2, and a third varistor VR3. One end of the first fusible resistor FR1 is used to acquire the DALI signal, and the other end of the first fusible resistor FR1 is connected to one end of the second varistor VR2, one end of the third varistor VR3, and the input terminal of the rectifier unit 13, respectively. One end of the second fusible resistor FR2 is connected to the other end of the second varistor VR2, and the other ends of the second fusible resistor FR2 and the third varistor VR3 are respectively connected to the input terminal of the rectifier unit 13.

[0040] In this embodiment, the overvoltage protection unit 11 effectively protects the DALI signal line by combining a first fusible resistor FR1, a second fusible resistor FR2, a second varistor VR2, and a third varistor VR3. When an overvoltage occurs in the line, varistor VR2 and VR3 can respond quickly, limiting the voltage rise and thus protecting the subsequent circuit from damage. Simultaneously, fusible resistors FR1 and FR2, as overcurrent protection elements, can melt and disconnect the circuit when the current abnormally increases, further enhancing the protection effect. Furthermore, one end of the first fusible resistor FR1 receives the DALI signal, while the other end is connected to the varistor and the input terminal of the rectifier unit 13, achieving integrated signal transmission and overvoltage protection. The series connection of the second fusible resistor FR2 and the second varistor VR2, and the parallel connection of the third varistor VR3 and the input terminal of the rectifier unit 13, together constitute a complete overvoltage protection network, improving the reliability and safety of the entire circuit.

[0041] In this embodiment, please refer to Figure 3 The control unit 2 includes a second control chip U2, the model of which is CS32F031K8U6H; pin PAB of the second control chip U2 is connected to the transmitting end of the first optocoupler B1, and pins PA3 and PA4 of the second control chip U2 are respectively connected to the receiving end of the second optocoupler B2; pins PB7 and PB6 of the second control chip U2 are respectively used to output control signals to the driver board of the iron-cased DALI power supply.

[0042] Further, please refer to Figure 1 and Figure 4 The signal processing circuit further includes a near-field communication unit 3, the input terminal of which is used to acquire wireless input signals, and the output terminal of which is connected to the input terminal of the control unit 2.

[0043] In this embodiment, please refer to Figure 4The near-field communication unit 3 includes a third control chip U3, the model of which is ST25DV04K-IER6S3. The pins AC0 and AC1 of the third control chip U3 are used to receive NFC signals. The pins RF, SCL and SDA of the third control chip U3 are respectively connected to the pins PA11, PA9 and PA10 of the second control chip U2.

[0044] In this embodiment, the function of the signal processing circuit is expanded by introducing the near-field communication unit 3. The near-field communication unit 3 can acquire wireless input signals, which provides users with a more convenient interaction method. Users can transmit and receive data without wired connection, greatly improving the flexibility and convenience of use. Furthermore, the near-field communication unit 3 adopts the third control chip U3 of model ST25DV04K-IER6S3. This chip has high performance and stability, which can ensure the reliability and accuracy of near-field communication. At the same time, the chip also supports multiple NFC models, enabling the signal processing circuit to be compatible with more devices and systems, further enhancing its practicality.

[0045] This utility model also provides a PCB board on which the signal processing circuits described above are printed.

[0046] This utility model also provides a metal-cased DALI power supply, wherein the metal-cased DALI power supply uses any of the signal processing circuits described above to achieve operation control.

[0047] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A signal processing circuit, characterized by comprising: The system includes a signal isolation unit and a control unit. The signal isolation unit includes an overvoltage protection section, a first control chip U1, and an isolation section. The input terminal of the overvoltage protection section is used to acquire DALI signals. The output terminal of the overvoltage protection section is connected to the DRAIN and HV pins of the first control chip U1. The TX and RX pins of the first control chip U1 are respectively connected to the first communication terminal of the isolation section. The second communication terminal of the isolation section is connected to the communication terminal of the control unit. The output terminal of the control unit is used to output control signals to the driver board of the metal-cased DALI power supply.

2. A signal processing circuit according to claim 1, characterised in that, The isolation unit includes a first isolation group and a second isolation group. The pins TX and RX of the first control chip U1 are respectively connected to the receiving end of the first isolation group and the transmitting end of the second isolation group. The transmitting end of the first isolation group and the receiving end of the second isolation group are respectively connected to the communication end of the control unit.

3. A signal processing circuit according to claim 2, characterised in that, The signal isolation unit further includes a rectifier and a power control unit. The output terminal of the overvoltage protection unit is connected to the input terminal of the rectifier. The output terminal of the rectifier is connected to the input terminal of the power control unit, the DRAIN pin and the HV pin of the first control chip U1, respectively. The output terminal of the power control unit is connected to the input terminal of the second isolation group.

4. A signal processing circuit according to claim 3, characterised in that, The signal isolation unit also includes a voltage regulator. The input terminal of the power control unit and the negative terminal of the voltage regulator are respectively connected to the pin VS of the first control chip U1, and the positive terminal of the voltage regulator is grounded.

5. A signal processing circuit as claimed in claim 4, characterized in that The voltage regulator includes a third Zener diode ZD3. The negative terminal of the third Zener diode ZD3 is connected to the pin VS of the first control chip U1, and the positive terminal of the third Zener diode ZD3 is grounded.

6. A signal processing circuit according to claim 4, characterised in that, The power control unit includes a power transistor Q1, a sixty-fourth resistor R64, a fifty-seventh resistor R57, and a fifty-ninth resistor R59. The DRAIN pin of the power transistor Q1 is connected to the output terminal of the rectifier unit and the sixty-fourth resistor R64. The other end of the sixty-fourth resistor R64 is connected to the VS pin of the first control chip U1 through the fifty-seventh resistor R57. The CS pin of the power transistor Q1 is connected to the input terminal of the second isolation group through the fifty-ninth resistor R59.

7. A signal processing circuit according to claim 3, wherein The overvoltage protection unit includes a first fusible resistor FR1, a second fusible resistor FR2, a second varistor VR2, and a third varistor VR3. One end of the first fusible resistor FR1 is used to acquire the DALI signal, and the other end of the first fusible resistor FR1 is connected to one end of the second varistor VR2, one end of the third varistor VR3, and the input terminal of the rectifier unit, respectively. One end of the second fusible resistor FR2 is connected to the other end of the second varistor VR2, and the other ends of the second fusible resistor FR2 and the third varistor VR3 are respectively connected to the input terminal of the rectifier unit.

8. A signal processing circuit according to claim 1, characterized in that It also includes a near-field communication unit, the input of which is used to acquire wireless input signals, and the output of which is connected to the input of the control unit.

9. A PCB board characterized by, The PCB board is printed with the signal processing circuit as described in any one of claims 1-8.

10. An iron cased DALI power supply, characterized in that, The metal-cased DALI power supply uses the signal processing circuit described in any one of claims 1-8 to achieve operation control.

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