Circuitry that automatically identifies input voltage to adjust current output and its stage lights

Abstract

This invention relates to a circuit device and a stage light that automatically identifies input voltage to adjust current output. The device comprises a first power supply module, a voltage identification module, a main control module, a PWM signal control module, and an LED driver module, all electrically connected in sequence. The voltage identification module identifies the voltage signal from the first power supply module. The main control module controls the PWM signal control module to output PWM signals with different duty cycles based on the voltage signal. The LED driver module outputs a corresponding current based on the current duty cycle of the PWM signal. The main control module controls the LED driver module to output a corresponding current based on the voltage signal, thereby enabling the stage light to adjust its current according to different input voltages. This prevents current overload caused by input voltage changes and ensures the safe output of the power required by the stage light.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, and more particularly to a circuit device for automatically identifying input voltage to adjust current output and a stage light thereof. Background Technology

[0002] In the design and application of stage lighting equipment, power supply voltage compatibility is a critical technical issue. Traditional stage lighting fixtures are typically designed to operate within a specific voltage range, such as 110V or 220V AC. However, due to differences in power supply voltage standards across different regions and occasions, stage lighting fixtures may be connected to a power supply with a voltage mismatch. For example, if a lighting fixture designed for 110V is mistakenly connected to a 220V power supply, it will cause a significant increase in the internal current of the fixture, potentially exceeding the maximum current withstand capability of its electronic components (such as driver circuits, LED modules, and control chips), leading to overheating, damage, or even fire hazards.

[0003] Currently, most stage lighting fixtures lack intelligent voltage recognition and protection mechanisms, and cannot automatically detect whether the input voltage matches its rated operating voltage. Although some high-end equipment may be equipped with overcurrent protection circuits (such as fuses or circuit breakers), these protection measures are usually passive, only cutting off the circuit after an abnormal increase in current, and cannot fundamentally avoid the potential risks caused by voltage mismatch. In addition, frequent triggering of overcurrent protection can also affect the normal use of the equipment and increase maintenance costs.

[0004] Therefore, there is an urgent need for a solution that can automatically identify the input voltage and dynamically adjust the operating status of stage lighting fixtures to fundamentally avoid current overload problems caused by voltage mismatch and improve the safety and adaptability of the equipment. Summary of the Invention

[0005] To solve one of the above-mentioned technical problems, this invention provides a circuit device and its stage light that automatically identifies the input voltage to adjust the current output.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A circuit device for automatically identifying input voltage to adjust current output includes a first power supply module, a voltage identification module, a main control module, a PWM signal control module, and an LED driver module that are connected in sequence.

[0008] The voltage identification module is used to identify the voltage signal of the first power supply module;

[0009] The main control module controls the PWM signal control module to output PWM signals with different duty cycles according to the voltage signal, and the LED driver module outputs corresponding current according to the PWM signal with the current duty cycle.

[0010] Further specified, the voltage identification module and the main control module are isolated by an optocoupler module.

[0011] Further defined, the LED driving module is provided in several parts, and each LED driving module is electrically connected to an LED load in a one-to-one correspondence. The LED load outputs power according to the current voltage and current values.

[0012] Further specified, the PWM signal control module is connected to the LED driver module via a PWM signal extension port.

[0013] Further defined, the voltage identification module includes a first controller, the first controller being a BL0942 model, the pin VP of the first controller being connected to one end of resistor R82, one end of resistor R111, and one end of capacitor C91 respectively, the other end of resistor R82 being connected to the live wire of the first power module through fuse F5, the other end of resistor R111, the other end of capacitor C91, and the pin GND of the first controller being grounded, the neutral wire of the first power module being grounded through fuse F6, and the first controller being connected to the optocoupler isolation module through pins TX / SDO and RX / SDI.

[0014] Further defined, it also includes a second power module, which includes a power isolator and a voltage regulator. The +Vin pin of the power isolator is connected to the VDD terminal and one end of capacitor C94, respectively. The -Vin pin of the source isolator is connected to the other end of capacitor C94 and then grounded. The +Vout pin of the source isolator is connected to the VO1 terminal, one end of capacitor C92, one end of capacitor C95, one end of resistor R71, and the Vin pin of the voltage regulator, respectively. The -Vout pin of the source isolator is connected to the other end of capacitor C92, the other end of capacitor C95, and the other end of resistor R71, respectively. The Vout pin of the voltage regulator is connected to one end of capacitor C93, one end of capacitor C96, and the 3.3V1 terminal, respectively. The other ends of capacitor C93 and capacitor C96 are grounded.

[0015] Further defined, the LED driving module includes a second controller, a parallel resistor module, a parallel capacitor module, and a third power supply module. The second controller is a VAS1226. The third power supply module is connected to one end of the parallel resistor module, the source of the field-effect transistor Q2, the VIN pin of the second controller, one end of the parallel capacitor module, one end of the capacitor C10, and the SNSH pin of the second controller. The other ends of the parallel capacitor module and the other ends of the capacitor C10 are grounded. The other end of the parallel resistor module is connected to the SNSL pin of the second controller, the source of the field-effect transistor Q1, and the positive terminal of the LED load. The gate of the field-effect transistor Q1 is connected to the third power supply module via resistor R1. The two controllers are connected to pins PDRV, and the drain of the field-effect transistor Q1 is connected to the negative terminal of the LED load and one end of the inductor L1. The gate of the field-effect transistor Q2 is connected to pin DRVH of the second controller through resistor R2. The drain of the field-effect transistor Q2 is connected to the other end of the inductor L1 and the drain of the field-effect transistor Q3. The gate of the field-effect transistor Q3 is connected to pin DRVL of the second controller through resistor R3. The source of the field-effect transistor Q3 is grounded. The PWM signal control module is connected to pin PWM of the second controller through resistor R6. Pin PWM of the second controller is grounded through resistor R7 and capacitor C14. Pin VCC of the second controller is grounded through capacitor C13.

[0016] Further specified, the main control module and the PWM signal control module communicate with each other via an RS485 communication module.

[0017] Further defined, the RS485 communication module includes a third controller, the third controller being a TP75176E model, the third controller being connected to the control terminal corresponding to the main control module via pins 485_CON, 485_TXD and 485_RXD respectively, and the third controller outputting signals to the PWM signal control module via pins A and B respectively.

[0018] A stage light, including the aforementioned circuitry.

[0019] After adopting the above technical solution, the present invention has at least the following beneficial effects: the voltage identification module sends the identified voltage signal to the main control module, and the main control module controls the LED driver module to make corresponding current output according to the voltage signal, so that the stage light can make corresponding current adjustment according to different input voltages, thereby preventing current overload caused by input voltage changes, and thus ensuring the safe output of the power required by the stage light. Attached Figure Description

[0020] Figure 1 It is a schematic diagram of the circuit device;

[0021] Figure 2 This is the circuit schematic of the voltage identification module;

[0022] Figure 3 This is the circuit diagram of the second power supply module;

[0023] Figure 4 This is the circuit diagram of the LED driver module;

[0024] Figure 5 This is the circuit diagram of the RS485 communication module;

[0025] Figure 6 This is the circuit diagram of the main control module;

[0026] Figure 7 This is the circuit diagram of the PWM signal control module;

[0027] Figure 8 This is the circuit diagram for the PWM signal expansion port. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] As attached Figure 1 As shown, a circuit device for automatically identifying input voltage to adjust current output includes a first power supply module 1, a voltage identification module 2, a main control module 3, a PWM signal control module 4, and an LED driver module 5 that are connected in sequence.

[0030] The voltage identification module 2 is used to identify the voltage signal of the first power module 1; specifically, the voltage identification module 2 can identify AC voltage values ​​in the range of 60-260V.

[0031] The main control module 3 controls the PWM signal control module 4 to output PWM signals with different duty cycles according to the voltage signal, and the LED driving module 5 outputs corresponding current according to the PWM signal with the current duty cycle.

[0032] The main control module 3 includes an MCU, the MCU model being APM32F407, as shown in the attached diagram. Figure 6 As shown, it adopts a 32-bit architecture, has powerful processing capabilities, and is suitable for handling complex algorithms and multi-tasking operations. At the same time, the APM32F407 integrates a variety of peripherals and interfaces, such as multiple UARTs, SPI, I2C interfaces, as well as timers and ADC / DAC, which can meet the needs of various applications.

[0033] In terms of specific working principle, the voltage identification module 2 sends the identified voltage signal to the main control module 3. The main control module 3 controls the LED driver module 5 to output the corresponding current according to the voltage signal, so that the stage light can make corresponding current adjustments according to different input voltages, thereby preventing current overload caused by input voltage changes and ensuring the safe output of the power required by the stage light.

[0034] As attached Figure 1 As shown, the voltage identification module 2 and the main control module 3 are isolated by an optocoupler isolation module 6. The voltage identification module 2 sends the identified voltage signal to the main control module 3 through the optocoupler isolation module 6, effectively isolating high voltage and low voltage, and improving the safety performance of the circuit device.

[0035] In this embodiment, several LED driving modules 5 are provided, and each LED driving module 5 is electrically connected to an LED load 7 in a one-to-one correspondence. The LED load 7 outputs power according to the current voltage and current values. It can be understood that the LED load 7 is an LED lamp bead. One LED driving module 5 drives a single lamp bead to ensure that each LED lamp bead has a corresponding driving circuit to achieve independent control.

[0036] As attached Figure 7 As shown, the PWM signal control module 4 is connected to the LED driver module 5 through the PWM signal expansion port 10. The PWM signal control module 4 includes a chip GD32E503RET6.

[0037] As attached Figure 2 As shown, the voltage identification module 2 includes a first controller, which is a BL0942. The VP pin of the first controller is connected to one end of resistor R82, one end of resistor R111, and one end of capacitor C91, respectively. The other end of resistor R82 is connected to the live wire of the first power module 1 through fuse F5. The other end of resistor R111, the other end of capacitor C91, and the GND pin of the first controller are grounded. The neutral wire of the first power module 1 is grounded through fuse F6. The first controller is connected to the optocoupler isolation module 6 through pins TX / SDO and RX / SDI. The function of fuses F5 and F6 is to blow when the current exceeds the rated value, thereby cutting off the circuit and preventing equipment damage or fire.

[0038] As attached Figure 3As shown, the circuit device also includes a second power supply module 8, which includes a power isolator 81 and a voltage regulator 82. The +Vin pin of the power isolator 81 is connected to the VDD terminal and one end of capacitor C94, respectively. The -Vin pin of the source isolator is connected to the other end of capacitor C94 and grounded. The +Vout pin of the source isolator is connected to the VO1 terminal, one end of capacitor C92, one end of capacitor C95, one end of resistor R71, and the Vin pin of the voltage regulator 82, respectively. The -Vout pin of the source isolator is connected to the other end of capacitor C92 and the other end of capacitor C95, respectively. One end of the regulator 82 is connected to the other end of the resistor R71. The pin Vout of the regulator 82 is connected to one end of the capacitor C93, one end of the capacitor C96, and the 3.3V1 terminal respectively. The other ends of the capacitor C93 and the other ends of the capacitor C96 are grounded. The second power module 8 is a DC power module. The second power module 8 supplies power to the optocoupler isolation module 6 through the VDD terminal and the VO1 terminal. It also supplies power to the first controller through the VO1 terminal. At the same time, the power isolator 81 effectively isolates the high voltage terminal (VO1 terminal, 3.3V1 terminal) and the low voltage terminal (VDD terminal) to improve the safety performance of the circuit device.

[0039] As attached Figure 4 and attached Figure 7 As shown, the LED driver module 5 includes a second controller, a resistor parallel module 51, a capacitor parallel module 52, and a third power supply module 53. The second controller uses a VAS1226, a synchronous buck controller chip particularly suitable for driving multiple strings of LEDs or LED arrays. This chip is suitable for an input voltage range of 7~60V and can drive output currents up to tens of amperes. The VAS1226 monitors the current flowing through the LED by detecting the voltage drop across the series resistor and uses a hysteresis comparison method to achieve precise control of the output current, ensuring that all LEDs have consistent brightness when cascaded.

[0040] The third power supply module is connected to one end of the resistor parallel module 51, the source of the field-effect transistor Q2, the VIN pin of the second controller, one end of the capacitor parallel module 52, one end of the capacitor C10, and the SNSH pin of the second controller. The other ends of the capacitor parallel module 52 and the capacitor C10 are grounded. The other end of the resistor parallel module 51 is connected to the SNSL pin of the second controller, the source of the field-effect transistor Q1, and the positive terminal of the LED load 7. The gate of the field-effect transistor Q1 is connected to the PDRV pin of the second controller through a resistor R1. The drain of the field-effect transistor Q1 is connected to the LED load 7. The negative terminal of carrier 7 is connected to one end of inductor L1. The gate of the field-effect transistor Q2 is connected to the second controller pin DRVH through resistor R2. The drain of the field-effect transistor Q2 is connected to the other end of inductor L1 and the drain of field-effect transistor Q3. The gate of the field-effect transistor Q3 is connected to the second controller pin DRVL through resistor R3. The source of the field-effect transistor Q3 is grounded. The PWM signal control module 4 is connected to the second controller pin PWM through resistor R6. The second controller pin PWM is grounded through resistor R7 and capacitor C14. The second controller pin VCC is grounded through capacitor C13.

[0041] The VAS1226 integrates a PMOS driver module to drive the high-side (DRVH) PMOS transistor Q2 and the low-side (DRVL) NMOS transistor Q3 to form a synchronous buck converter structure, thus realizing a synchronous buck loop. The chip uses high-side current sensing technology to precisely control the output current by detecting the voltage across the resistor parallel module 51. High-side current sensing avoids ground interference and improves system stability. The VAS1226 supports PWM dimming with excellent dimming performance.

[0042] During dimming, the PWM signal connected to the PWM pin can adjust the brightness of the LED. When the signal is low, the second controller turns off the power NMOS on the low side and stops supplying power to the LED. When the PWM signal is high, the system switches normally, maintaining the LED output current at the set value.

[0043] The VAS1226 can also expand the dimming function to achieve the best dimming effect. This can be achieved by adding a field-effect transistor Q1. Using PWM signal dimming can achieve stepless brightness variation.

[0044] As attached Figure 4 and attached Figure 7As shown, the second controller receives the PWM signal from the PWM signal control module 4 (or the PWM signal extension port 10) via the PWM pin. The second controller outputs corresponding current to the LED load 7 module at the LED+ and LED- terminals according to different duty cycle PWM signals, thereby satisfying different power output requirements.

[0045] As attached Figure 5 As shown, the main control module 3 and the PWM signal control module 4 communicate via an RS485 communication module 9. The RS485 communication module 9 includes a third controller, which is a TP75176E. The third controller is connected to the control terminals of the main control module 3 via pins 485_CON, 485_TXD, and 485_RXD. The third controller outputs signals to the PWM signal control module 4 via pins A and B, respectively, thus achieving stable, long-distance, and interference-resistant serial communication.

[0046] A stage light, including the aforementioned circuitry.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various equivalent changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit arrangement for automatically identifying an input voltage to adjust a current output, characterized by, It includes a first power supply module (1), a voltage identification module (2), a main control module (3), a PWM signal control module (4), and an LED driver module (5) that are connected in sequence. The voltage identification module (2) is used to identify the voltage signal of the first power module (1); The main control module (3) controls the PWM signal control module (4) to output PWM signals with different duty cycles according to the voltage signal, and the LED driving module (5) outputs the corresponding current according to the PWM signal with the current duty cycle.

2. The circuit arrangement of claim 1, characterized in that The voltage identification module (2) and the main control module (3) are isolated by an optocoupler module (6).

3. The circuit device according to claim 1, characterized in that, The LED driving module (5) is provided in several parts, and each LED driving module (5) is electrically connected to an LED load (7) in a one-to-one correspondence. The LED load (7) outputs power according to the current voltage and current values.

4. The circuit device according to claim 3, characterized in that, The PWM signal control module (4) is connected to the LED driver module (5) through the PWM signal expansion port (10).

5. The circuit device according to claim 2, characterized in that, The voltage identification module (2) includes a first controller, which is a BL0942. The pin VP of the first controller is connected to one end of resistor R82, one end of resistor R111 and one end of capacitor C91 respectively. The other end of resistor R82 is connected to the live wire of the first power module (1) through fuse F5. The other end of resistor R111, the other end of capacitor C91 and the pin GND of the first controller are grounded. The neutral wire of the first power module (1) is grounded through fuse F6. The first controller is connected to the optocoupler isolation module (6) through pin TX / SDO and pin RX / SDI.

6. The circuit device according to claim 1, characterized in that, It also includes a second power module (8), which includes a power isolator (81) and a voltage regulator (82). The +Vin pin of the power isolator (81) is connected to the VDD terminal and one end of the capacitor C94, respectively. The -Vin pin of the source isolator is connected to the other end of the capacitor C94 and grounded. The +Vout pin of the source isolator is connected to the VO1 terminal, one end of the capacitor C92, one end of the capacitor C95, one end of the resistor R71, and the Vin pin of the voltage regulator (82), respectively. The -Vout pin of the source isolator is connected to the other end of the capacitor C92, the other end of the capacitor C95, and the other end of the resistor R71, respectively. The Vout pin of the voltage regulator (82) is connected to one end of the capacitor C93, one end of the capacitor C96, and the 3.3V1 terminal, respectively. The other ends of the capacitor C93 and the other ends of the capacitor C96 are grounded.

7. The circuit device according to claim 3, characterized in that, The LED driving module (5) includes a second controller, a resistor parallel module (51), a capacitor parallel module (52), and a third power supply module (53). The second controller is a VAS1226. The third power supply module is connected to one end of the resistor parallel module (51), the source of the field-effect transistor Q2, the VIN pin of the second controller, one end of the capacitor parallel module (52), one end of the capacitor C10, and the SNSH pin of the second controller. The other end of the capacitor parallel module (52) and the other end of the capacitor C10 are grounded. The other end of the resistor parallel module (51) is connected to the SNSL pin of the second controller, the source of the field-effect transistor Q1, and the positive terminal of the LED load (7). The gate of the field-effect transistor Q1 is... The drain of the field-effect transistor Q1 is connected to the negative terminal of the LED load (7) and one end of the inductor L1 via resistor R1. The gate of the field-effect transistor Q2 is connected to the pin DRVH of the second controller via resistor R2. The drain of the field-effect transistor Q2 is connected to the other end of the inductor L1 and the drain of the field-effect transistor Q3. The gate of the field-effect transistor Q3 is connected to the pin DRVL of the second controller via resistor R3. The source of the field-effect transistor Q3 is grounded. The PWM signal control module (4) is connected to the pin PWM of the second controller via resistor R6. The pin PWM of the second controller is grounded via resistor R7 and capacitor C14. The pin VCC of the second controller is grounded via capacitor C13.

8. The circuit device according to claim 1, characterized in that, The main control module (3) and the PWM signal control module (4) communicate with each other through the RS485 communication module (9).

9. The circuit device according to claim 8, characterized in that, The RS485 communication module (9) includes a third controller, which is a TP75176E. The third controller is connected to the control terminal of the main control module (3) through pins 485_CON, 485_TXD and 485_RXD respectively. The third controller outputs signals to the PWM signal control module (4) through pins A and B respectively.

10. A stage light, characterized in that, It includes the circuit device described in any one of claims 1 to 9.

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