Stage lamp switching power supply circuit with constant current drive

By combining a constant current output circuit, an input rectification and filtering circuit, a power factor correction circuit, an output feedback circuit, and a resonant conversion circuit, the problems of high cost and large size of constant voltage switching power supplies in stage lighting light sources are solved, and an efficient and compact constant current drive effect is achieved.

CN223488444UActive Publication Date: 2025-10-28GUANGDONG HONGKAI ELECTRONIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202422911370.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-10-28
Estimated Expiration
2034-11-28

AI Technical Summary

Technical Problem

The existing constant voltage switching power supply and constant current drive module of stage light sources result in high cost and large size, and a more compact and economical power supply circuit is needed.

Method used

The combination of constant current output circuit, input rectification and filtering circuit, power factor correction circuit, output feedback circuit, resonant conversion circuit and output rectification and filtering circuit is adopted to achieve EMI anti-interference, dynamic response enhancement, heat dissipation, EMI reduction, capacitive mode switching prevention, and improved efficiency and current smoothness.

Benefits of technology

The invention realizes efficient and compact constant current drive of stage light source, reduces cost and volume, and improves circuit reliability and current smoothness.

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Abstract

The utility model provides a stage lamp switching power supply circuit with constant current driving, which comprises a constant current output circuit, an input rectification filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit and an output rectification filter circuit, the power factor correction circuit and the output feedback circuit are respectively and electrically connected with the resonant conversion circuit, the output feedback circuit is further electrically connected with the output rectification filter circuit, the resonant conversion circuit is further electrically connected with the output rectification filter circuit, and the output rectification filter circuit is connected with the constant current output circuit. According to the scheme, the switching power supply and the LED constant-current driver are integrated on one board and can be used by being matched with a corresponding light source, so that the development period is greatly shortened, and the production difficulty is reduced.
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Description

Technical Field

[0001] This utility model relates to the field of LED technology, and in particular to a stage light switching power supply circuit with constant current drive. Background Technology

[0002] In recent years, with the steady growth of disposable income, the continuous upgrading of consumption concepts, and the continuous improvement of cultural literacy among Chinese residents, people have increasingly higher requirements for artistic performances, tourism, and entertainment products, leading to a continuous increase in demand for stage and venue lighting, and a sustained expansion of the market. With the continuous upgrading of products and technologies and economic development, the market size of China's stage and venue lighting manufacturing industry continues to expand.

[0003] Existing stage lighting solutions generally use a constant voltage switching power supply paired with a constant current drive module to drive LED light sources. This combination results in a large overall footprint and cost. In order to reduce costs and reduce the size of the drive, a stage lighting switching power supply circuit with constant current drive is needed. Utility Model Content

[0004] To overcome the aforementioned shortcomings of existing technologies, a stage light switching power supply circuit with constant current drive is provided, which solves the technical problems of high cost and large size of stage light switching power supplies with drive modules in existing applications.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a stage light switching power supply circuit with constant current drive, including a constant current output circuit, an input rectifier and filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit, and an output rectifier and filter circuit. The input rectifier and filter circuit is electrically connected to the power factor correction circuit. The power factor correction circuit and the output feedback circuit are respectively electrically connected to the resonant conversion circuit. The output feedback circuit is also electrically connected to the output rectifier and filter circuit. The resonant conversion circuit is also electrically connected to the output rectifier and filter circuit. The output rectifier and filter circuit is connected to the constant current output circuit.

[0006] As a further improvement of this utility model: the input rectifier filter circuit includes a fuse F1, a capacitor CX1, an inductor LF2, a rectifier bridge DB1, capacitors CY1, CY2, and CL2. One end of the fuse F1 is connected to pin 3 of terminal CN1, and the other end of the fuse F1 is connected to one end of capacitor CX1, one end of capacitor CY1, and pin 3 of inductor LF2. The other end of capacitor CX1 is connected to pin 2 of terminal CN1, one end of capacitor CY2, and pin 1 of inductor LF2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and pin 1 of the input terminal and grounded. Pin 3 of rectifier bridge DB1 is connected to pin 4 of inductor LF2, pin 2 of rectifier bridge DB1 is connected to pin 2 of inductor LF2, pin 1 of rectifier bridge DB1 is electrically connected to one end of capacitor CL2 and connected to the bus, and pin 4 of rectifier bridge DB1 is connected to the other end of capacitor CL2.

[0007] As a further improvement of this utility model: the power factor correction circuit includes an integrated chip U1. Pin 4 of the integrated chip U1 is connected to capacitor C13, resistor R12, and the cathode of diode D6. Pin 2 of the integrated chip U1 is connected to resistor R9 and capacitor C3. Pin 5 of the integrated chip U1 is connected to capacitor C4 and capacitor C6. Pin 6 of the integrated chip U1 is connected to capacitor C7, resistor R18, and resistor R13. Pin 3 of the integrated chip U1 is connected to resistor R8 and capacitor C5. Pin 8 of the integrated chip U1 is connected to resistor R10. Pin 7 of the integrated chip U1 is connected to capacitor C3. 4. Connect to the power supply voltage. The other end of capacitor C34 is grounded. The anode of diode D6 is equipped with resistors R23, R21, and R16, which are connected in series. The anode of diode D6 is connected to resistor R23. Resistor R16 is connected to the bus. Resistor R8 is connected to capacitor C12, resistors RS1, RS2, and RS3. Capacitor C12 is connected to the anode of diode D3, inductor T1A, and inductor T1B. The cathode of diode D3 is connected to the cathode of diode D1, resistor R2, capacitor E1, and capacitor E2. Capacitor E1 and... The other end of capacitor E2 is connected to and grounded. The other ends of inductors T1A and T1B are connected to the drain of MOSFET Q1, the drain of MOSFET Q2, capacitor C2, and the anode of diode D1. The gate of MOSFET Q1 is connected to the anode of diode D2 and resistor R20. The gate of MOSFET Q2 is connected to the anode of diode D88 and resistor R15. The cathode of diode D2 and the other end of resistor R20 are connected to resistor R4. The cathode of diode D88 and the other end of resistor R15 are connected to resistor R3. The source of MOSFET Q1, the source of MOSFET Q2, capacitor C2, and resistor R... Resistors RS2 and RS3 are connected to ground. The other ends of resistors R3 and R4 are connected to resistor R24, the emitter of transistor Q15, and the emitter of transistor Q17. The collector of transistor Q15 is connected to one end of capacitor C33. The collector of transistor Q17, the other end of capacitor C33, and resistor R24 ​​are connected to ground. The base of transistor Q15, the base of transistor Q17, resistors R5 and R10 are connected. The other end of resistor R13 is connected to resistor R7, which is also connected to resistor R2.

[0008] As a further improvement of this utility model: the resonant conversion circuit includes an integrated chip U2. Pin 1 of the integrated chip U2 is connected to one end of capacitor C15 and resistor R30; pin 2 of the integrated chip U2 is connected to resistor R50 and capacitor C16; pin 3 of the integrated chip U2 is connected to capacitor C17; pin 4 of the integrated chip U2 is connected to the other end of resistor R39, resistor R58, and resistor R51; pin 5 of the integrated chip U2 is connected to capacitor C21 and resistor R49; pin 6 of the integrated chip U2 is connected to capacitor C23 and resistor R58; and pin 7 of the integrated chip U2 is connected to resistor R62 and capacitor C24. Pin 8 of integrated chip U2 is connected to resistor R63, capacitor C25, and the emitter of phototransistor U6B. The collector of phototransistor U6B is connected to resistor R57, which is also connected to capacitor C27 and capacitor E5. Pin 9 of integrated chip U2 is connected to capacitor C11 and the cathode of diode D11. The anode of diode D11 is connected to resistor R47, capacitors CR1 and CR2, and the source of field-effect transistor Q7, and grounded. Pin 11 of integrated chip U2 is connected to resistor R44. Pin 14 of integrated chip U2 is connected to the other end of capacitor C11, capacitor C9, resistor R33, the source of field-effect transistor Q5, and the field-effect transistor... The drain of transistor Q7, inductors L2A and L2B are connected together. The other ends of inductors L2A and L2B are connected to inductor T2A. Pin 15 of integrated chip U2 is connected to resistor R32. Pin 16 of integrated chip U2 is connected to the other end of capacitor C9. The other end of resistor R32 is connected to the cathode of diode D7 and resistor R29. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R33 and the gate of MOSFET Q5. The other end of resistor R44 is connected to the cathode of diode D8 and resistor R42. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R47 and the gate of MOSFET Q5. The gate of Q7, the other end of the inductor T2A is connected to capacitors CR1, CR2 and C18, the resistor R49 is connected to resistor R51, capacitor C22 and the collector of phototransistor U5B, the resistor R58 is connected to resistors R60, R61 and capacitor C18, the capacitors C15, R50, C16, C17, R59, C21, C23, R62, C24, R63, C25, pin 10 of integrated chip U2, capacitor C27, capacitor E5, resistors R60, R61 and C22 and the emitter of phototransistor U5B are connected and grounded.

[0009] As a further improvement of this utility model: the output rectifier filter circuit includes terminal CN2, port P1 and port P2. Pin 1 of port P1, pin 1 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, R27, and the cathode of diode D23 are connected to and connected to pin 1 of terminal CN2. The anode of diode D23 is connected to inductor T2E. Pins 2 of port P1, pin 2 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, and R27 are connected and grounded. Pin 3 of terminal CN2 is also connected to the cathode of diode D22, capacitor E6, resistors R41, R48, R64, R65, R98, R97, and R67. The anode of diode D22 is connected to inductors T2C and T2D respectively. Inductor T2C connects the anode of diode D10 and diode D9. Inductor T2D connects the anode of diode D10 and diode D9. The cathodes of diode D10 and D9, resistors R70, R69, and R68, capacitors E7 and E8, resistors R36, R37, and R38, capacitor CY4, and capacitor C10 are connected. Capacitor CY4 is also connected to capacitor CY5. Pin 3 of terminal CN2 is also connected to the anode of LED1. The cathode of LED1 is connected to resistor R43. Capacitors E6, R41, R48, R64, R65, R98, R97, R67, R70, R69, and R68, capacitors E7, E8, R43, R36, R37, and R38, capacitor CY5, and capacitor C10 are connected and grounded.

[0010] As a further improvement of this utility model: the constant current output circuit includes an integrated chip U8, pin 1 of the integrated chip U8 is connected to a resistor R81 and a capacitor C48, pin 4 of the integrated chip U8 is connected to a resistor R82, pin 2 of the integrated chip U8 is connected to a capacitor C49 and a resistor R83, pin 5 of the integrated chip U8 is connected to the cathode of diode DZ7, a resistor R78, a capacitor C47 and a resistor R80, and the other end of the resistor R80 is connected to the PWM. Pin 6 of the integrated chip U8, capacitor E12, resistors R78 and R75, and capacitor C46 are connected to the power supply. Pin 7 of the integrated chip U8 is connected to resistors R75, C45, R74, and R66. Pin 8 of the integrated chip U8 is connected to resistor R79. Resistor R74 is connected to pin 1 of adjustable resistor VR2. Capacitors E12 and C60 are connected. Capacitors C60, C64, and C65, resistor R81, the cathode of diode D25, and pin 1 of port LEDA are connected. Pin 2 of port LEDA is connected to inductor L5. Inductor L5 connects the anode of diode D25 and the drain of MOSFET Q14. The gate of MOSFET Q14 is connected to... Connect resistors R85 and R84. Connect the source of the field-effect transistor Q14 to resistors RS6, RS5, RS4, and R83. Connect resistor R85 to the emitter of transistor Q18 and the cathode of diode D28. Connect the base of transistor Q18, the anode of diode D28, and resistor R82. Connect the third and second pins of adjustable resistor VR2, capacitors C45 and C46, ​​resistor R79, capacitor E12, capacitor C60, resistor R66, capacitor C47, the anode of diode DZ7, the third pin of integrated chip U8, capacitors C49 and C48, the collector of transistor Q18, resistors R84, RS6, RS5, and RS4 to ground.

[0011] As a further improvement of this utility model: the output feedback circuit includes a voltage regulator U7 and an adjustable resistor VR1. The cathode of the voltage regulator U7 is connected to capacitor C19, capacitor C20, resistor R56 and the cathode of photodiode U5A. The anode of the voltage regulator U7 is grounded. The anode of the photodiode U5A is connected to resistor R55. Resistors R55, R56, R53 and the anode of diode DZ3 are connected. Capacitor C20 is connected to resistor R54. Resistor R54 is connected to capacitor C19, the reference terminal of voltage regulator U7, resistors R30, R99, R31, R46 and R45. Resistor R45 is connected to pin 3 of adjustable resistor VR1. Resistor R46 is connected to pin 2 and pin 1 of adjustable resistor VR1 and grounded.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This utility model mainly employs a constant current output circuit, an input rectifier and filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit, and an output rectifier and filter circuit in combination. The input rectifier and filter circuit provides EMI suppression for the input power supply. The power factor correction circuit enhances dynamic response and distributes heat. The resonant conversion circuit reduces EMI and improves efficiency, preventing potentially destructive capacitive mode switching during output short circuits or severe overloads. The output feedback circuit allows for simultaneous sampling of multiple references, improving the circuit's cross-regulation. The output rectifier and filter circuit improves the rectifier's efficiency and facilitates current smoothing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the implementation of the stage light switching power supply circuit with constant current drive provided by this utility model;

[0015] Figure 2 This is a circuit diagram of the input rectifier and filter circuit provided by this utility model;

[0016] Figure 3 This is a circuit diagram of the power factor correction circuit provided by this utility model;

[0017] Figure 4 This is a circuit diagram of the resonant conversion circuit provided by this utility model;

[0018] Figure 5 This is a circuit diagram of the output rectifier and filter circuit provided by this utility model;

[0019] Figure 6 This is a circuit diagram of the constant current output circuit provided by this utility model;

[0020] Figure 7 This is a circuit diagram of the output feedback circuit provided by this utility model. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings and embodiments: A stage light switching power supply circuit with constant current drive includes a constant current output circuit, an input rectifier and filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit, and an output rectifier and filter circuit. The input rectifier and filter circuit is electrically connected to the power factor correction circuit. The power factor correction circuit and the output feedback circuit are respectively electrically connected to the resonant conversion circuit. The output feedback circuit is also electrically connected to the output rectifier and filter circuit. The resonant conversion circuit is also electrically connected to the output rectifier and filter circuit. The output rectifier and filter circuit is connected to the constant current output circuit. This utility model mainly employs a constant current output circuit, an input rectifier and filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit, and an output rectifier and filter circuit in combination. The input rectifier and filter circuit provides EMI suppression for the input power supply. The power factor correction circuit enhances dynamic response and distributes heat. The resonant conversion circuit reduces EMI and improves efficiency, preventing potentially destructive capacitive mode switching during output short circuits or severe overloads. The output feedback circuit allows for simultaneous sampling of multiple references, improving the circuit's cross-regulation. The output rectifier and filter circuit improves the rectifier's efficiency and facilitates current smoothing.

[0022] In one embodiment of this application, the input rectifier filter circuit includes a fuse F1, a capacitor CX1, an inductor LF2, a rectifier bridge DB1, capacitors CY1, CY2, and CL2. One end of the fuse F1 is connected to pin 3 of terminal CN1, and the other end of the fuse F1 is connected to one end of capacitor CX1, one end of capacitor CY1, and pin 3 of inductor LF2. The other end of capacitor CX1 is connected to pin 2 of terminal CN1, one end of capacitor CY2, and pin 1 of inductor LF2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and... The first pin of the input terminal is connected to and grounded. The third pin of the rectifier bridge BD1 is connected to the fourth pin of the inductor LF2. The second pin of the rectifier bridge BD1 is connected to the second pin of the inductor LF2. The first pin of the rectifier bridge BD1 is electrically connected to one end of the capacitor CL2 and connected to the bus. The fourth pin of the rectifier bridge BD1 is connected to the other end of the capacitor CL2. In this embodiment, capacitors CX1, CY1, CY2 and inductor LF2 form an EMI anti-interference circuit, which is low in cost. The rectifier bridge DB1 and capacitor CL2 form a full-bridge rectifier and filter circuit, which is widely used.

[0023] In one embodiment of this application, the power factor correction circuit includes an integrated chip U1. Pin 4 of the integrated chip U1 is connected to capacitor C13, resistor R12, and the cathode of diode D6. Pin 2 of the integrated chip U1 is connected to resistor R9 and capacitor C3. Pin 5 of the integrated chip U1 is connected to capacitor C4 and capacitor C6. Pin 6 of the integrated chip U1 is connected to capacitor C7, resistor R18, and resistor R13. Pin 3 of the integrated chip U1 is connected to resistor R8 and capacitor C5. Pin 8 of the integrated chip U1 is connected to resistor R10. Pin 7 of the integrated chip U1 is connected to capacitor C34 and... With the power supply voltage connected, the other end of capacitor C34 is grounded. Resistors R23, R21, and R16 are connected to the anode of diode D6 in series. The anode of diode D6 is connected to resistor R23. Resistor R16 is connected to the bus. Resistor R8 is connected to capacitor C12, resistors RS1, RS2, and RS3. Capacitor C12 is connected to the anode of diode D3, inductor T1A, and inductor T1B. The cathode of diode D3 is connected to the cathode of diode D1, resistor R2, capacitor E1, and capacitor E2. Capacitor E1 and... The other end of capacitor E2 is connected to and grounded. The other ends of inductors T1A and T1B are connected to the drain of MOSFET Q1, the drain of MOSFET Q2, capacitor C2, and the anode of diode D1. The gate of MOSFET Q1 is connected to the anode of diode D2 and resistor R20. The gate of MOSFET Q2 is connected to the anode of diode D88 and resistor R15. The cathode of diode D2 and the other end of resistor R20 are connected to resistor R4. The cathode of diode D88 and the other end of resistor R15 are connected to resistor R3. The source of MOSFET Q1, the source of MOSFET Q2, capacitor C2, and resistor R... Resistors RS2 and RS3 are connected to ground. The other ends of resistors R3 and R4 are connected to resistor R24, the emitter of transistor Q15, and the emitter of transistor Q17. The collector of transistor Q15 is connected to one end of capacitor C33. The collector of transistor Q17, the other end of capacitor C33, and resistor R24 ​​are connected to ground. The bases of transistors Q15 and Q17, resistors R5 and R10 are connected. The other end of resistor R13 is connected to resistor R7, which is also connected to resistor R2. The power factor control chip U1 has enhanced dynamic response characteristics, a dual-loop voltage and current design, high reliability, and parallel use of MOSFETs Q1 and Q2 to distribute heat evenly.

[0024] In one embodiment of this application, the resonant conversion circuit includes an integrated chip U2. Pin 1 of the integrated chip U2 is connected to one end of capacitor C15 and resistor R30; pin 2 of the integrated chip U2 is connected to resistor R50 and capacitor C16; pin 3 of the integrated chip U2 is connected to capacitor C17; pin 4 of the integrated chip U2 is connected to the other end of resistor R39, resistor R58, and resistor R51; pin 5 of the integrated chip U2 is connected to capacitor C21 and resistor R49; pin 6 of the integrated chip U2 is connected to capacitor C23 and resistor R58; and pin 7 of the integrated chip U2 is connected to resistor R62 and capacitor C24. Pin 8 of chip U2 is connected to resistor R63, capacitor C25, and the emitter of phototransistor U6B. The collector of phototransistor U6B is connected to resistor R57, which is also connected to capacitor C27 and capacitor E5. Pin 9 of integrated chip U2 is connected to capacitor C11 and the cathode of diode D11. The anode of diode D11 is connected to resistor R47, capacitors CR1 and CR2, and the source of MOSFET Q7, and grounded. Pin 11 of integrated chip U2 is connected to resistor R44. Pin 14 of integrated chip U2 is connected to the other end of capacitor C11, capacitor C9, resistor R33, the source of MOSFET Q5, and the MOSFET... The drain of transistor Q7, inductors L2A and L2B are connected together. The other ends of inductors L2A and L2B are connected to inductor T2A. Pin 15 of integrated chip U2 is connected to resistor R32. Pin 16 of integrated chip U2 is connected to the other end of capacitor C9. The other end of resistor R32 is connected to the cathode of diode D7 and resistor R29. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R33 and the gate of MOSFET Q5. The other end of resistor R44 is connected to the cathode of diode D8 and resistor R42. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R47 and the gate of MOSFET Q5. The gate of the inductor T2A is connected to capacitors CR1, CR2, and C18. Resistor R49 is connected to resistor R51, capacitor C22, and the collector of phototransistor U5B. Resistor R58 is connected to resistors R60 and R61, and capacitor C18. Capacitors C15, R50, C16, C17, R59, C21, C23, R62, C24, R63, C25, pin 10 of integrated chip U2, capacitor C27, capacitor E5, resistors R60 and R61, capacitor C22, and the emitter of phototransistor U5B are connected and grounded. The resonant control chip U2 has an adaptive time zone function, which simplifies the design, reduces EMI, and improves efficiency. U2 also has capacitive mode protection, which can prevent potentially destructive capacitive mode switching in the event of an output short circuit or severe overload. This feature ensures the reliability of the converter under abnormal conditions.

[0025] In one embodiment of this application, the output rectifier filter circuit includes a terminal CN2, a port P1, and a port P2. Pin 1 of port P1, pin 1 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, R27, and the cathode of diode D23 are connected to and connected to pin 1 of terminal CN2. The anode of diode D23 is connected to inductor T2E. Pins 2 of port P1, pin 2 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, and R27 are connected and grounded. Pin 3 of terminal CN2 is also connected to the cathode of diode D22, capacitor E6, resistors R41, R48, R64, R65, R98, R97, and R67. The anode of diode D22 is connected to inductors T2C and T2D respectively. Inductor T2C connects the anode of diode D10 and diode D9. Inductor T2D connects the anode of diode D10 and diode D9. The cathodes of diode D10 and D9, resistors R70, R69, and R68, capacitors E7 and E8, resistors R36, R37, and R38, capacitor CY4, and capacitor C10 are connected. Capacitor CY4 is also connected to capacitor CY5. The third pin of terminal CN2 is also connected to the anode of LED1. The cathode of LED1 is connected to resistor R43. Capacitors E6, R41, R48, R64, R65, R98, R97, R67, R70, R69, and R68, capacitors E7, E8, R43, R36, R37, and R38, capacitor CY5, and capacitor C10 are connected and grounded. The output adopts a full-wave rectifier circuit, which makes full use of the two half-waves of AC during operation, improving the efficiency of the rectifier and making the current easier to smooth. At the same time, the same transformer winding is used for multiple outputs, which reduces costs.

[0026] In one embodiment of this application, the constant current output circuit includes an integrated chip U8. Pin 1 of the integrated chip U8 is connected to a resistor R81 and a capacitor C48. Pin 4 of the integrated chip U8 is connected to a resistor R82. Pin 2 of the integrated chip U8 is connected to a capacitor C49 and a resistor R83. Pin 5 of the integrated chip U8 is connected to the cathode of a diode DZ7, a resistor R78, a capacitor C47, and a resistor R80. The other end of the resistor R80 is connected to a PWM circuit. Pin 6 of the integrated chip U8, capacitor E12, resistors R78 and R75, and capacitor C46 are connected to the power supply. Pin 7 of the integrated chip U8 is connected to resistors R75, C45, R74, and R66. Pin 8 of the integrated chip U8 is connected to resistor R79. Resistor R74 is connected to pin 1 of adjustable resistor VR2. Capacitors E12 and C60 are connected. Capacitors C60, C64, and C65, resistor R81, the cathode of diode D25, and pin 1 of port LEDA are connected. Pin 2 of port LEDA is connected to inductor L5. Inductor L5 connects the anode of diode D25 and the drain of MOSFET Q14. The gate of MOSFET Q14 is connected to... Connect resistors R85 and R84. The source of the field-effect transistor Q14 is connected to resistors RS6, RS5, RS4, and R83. Resistor R85 connects to the emitter of transistor Q18 and the cathode of diode D28. The base of transistor Q18, the anode of diode D28, and resistor R82 are connected. Pin 3 and pin 2 of adjustable resistor VR2, capacitors C45 and C46, ​​resistors R79, E12, C60, R66, and C47, the anode of diode DZ7, pin 3 of integrated chip U8, capacitors C49 and C48, the collector of transistor Q18, resistors R84, RS6, RS5, and RS4 are connected and grounded. The constant current control chip U8 has PWM and analog dual dimming functions, simplifying the design and improving application flexibility. This constant current circuit can operate within a voltage range of 8-450V without external auxiliary power supply, making it widely applicable.

[0027] In one embodiment of this application, the output feedback circuit includes a voltage regulator U7 and an adjustable resistor VR1. The cathode of the voltage regulator U7 is connected to capacitor C19, capacitor C20, resistor R56, and the cathode of photodiode U5A. The anode of the voltage regulator U7 is grounded. The anode of the photodiode U5A is connected to resistor R55. Resistors R55, R56, and R53 are connected to the anode of diode DZ3. Capacitor C20 is connected to resistor R54. Resistor R54 is connected to capacitor C19, the reference terminal of voltage regulator U7, resistors R30, R99, R31, R46, and R45. Resistor R45 is connected to pin 3 of the adjustable resistor VR1. Resistor R46 is connected to pin 2 and pin 1 of the adjustable resistor VR1 and grounded. The output voltage feedback sampling can simultaneously sample multiple references, improving the circuit cross-regulation rate. The adjustable resistor VR1 makes the output voltage adjustable, which can meet more output voltage requirements.

[0028] This solution integrates the switching power supply and LED constant current driver onto a single board, allowing customers to use it simply by pairing it with the appropriate light source. This significantly reduces the development cycle and lowers production difficulty.

[0029] In summary, any other corresponding modifications made by those skilled in the art after reading this utility model document, based on the technical solution and concept of this utility model without creative mental effort, shall all fall within the scope of protection of this utility model.

Claims

1. A stage light switching power supply circuit with constant current drive, characterized in that, It includes a constant current output circuit, an input rectifier and filter circuit, a power factor correction circuit, an output feedback circuit, a resonant conversion circuit, and an output rectifier and filter circuit. The input rectifier and filter circuit is electrically connected to the power factor correction circuit. The power factor correction circuit and the output feedback circuit are respectively electrically connected to the resonant conversion circuit. The output feedback circuit is also electrically connected to the output rectifier and filter circuit. The resonant conversion circuit is also electrically connected to the output rectifier and filter circuit. The output rectifier and filter circuit is connected to the constant current output circuit.

2. The stage light switching power supply circuit with constant current drive according to claim 1, characterized in that, The input rectifier and filter circuit includes a fuse F1, a capacitor CX1, an inductor LF2, a rectifier bridge DB1, capacitors CY1, CY2, and CL2. One end of the fuse F1 is connected to pin 3 of terminal CN1, and the other end of the fuse F1 is connected to one end of capacitor CX1, one end of capacitor CY1, and pin 3 of inductor LF2. The other end of capacitor CX1 is connected to pin 2 of terminal CN1, one end of capacitor CY2, and pin 1 of inductor LF2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and pin 1 of the input terminal and grounded. Pin 3 of rectifier bridge DB1 is connected to pin 4 of inductor LF2, pin 2 of rectifier bridge DB1 is connected to pin 2 of inductor LF2, pin 1 of rectifier bridge DB1 is electrically connected to one end of capacitor CL2 and connected to the bus, and pin 4 of rectifier bridge DB1 is connected to the other end of capacitor CL2.

3. The stage light switching power supply circuit with constant current drive according to claim 2, characterized in that, The power factor correction circuit includes an integrated chip U1. Pin 4 of the integrated chip U1 is connected to capacitor C13, resistor R12, and the cathode of diode D6. Pin 2 of the integrated chip U1 is connected to resistor R9 and capacitor C3. Pin 5 of the integrated chip U1 is connected to capacitor C4 and capacitor C6. Pin 6 of the integrated chip U1 is connected to capacitor C7, resistor R18, and resistor R13. Pin 3 of the integrated chip U1 is connected to resistor R8 and capacitor C5. Pin 8 of the integrated chip U1 is connected to resistor R10. Pin 7 of the integrated chip U1 is connected to capacitor C34 and connected to the power supply voltage. The other end of capacitor C34 is grounded. Resistors R23, R21, and R16 are connected to the anode of diode D6 in series. The anode of diode D6 is connected to resistor R23, and resistor R16 is connected to the bus. Resistor R8 is connected to capacitor C12, resistors RS1, RS2, and RS3. Capacitor C12 is connected to the anode of diode D3, inductor T1A, and inductor T1B. The cathode of diode D3 is connected to the cathode of diode D1, resistor R2, capacitor E1, and capacitor E2. The other end of capacitors E1 and E2... The terminals of inductors T1A and T1B are connected to ground. The other ends of inductors T1A and T1B are connected to the drain of MOSFET Q1, the drain of MOSFET Q2, capacitor C2, and the anode of diode D1. The gate of MOSFET Q1 is connected to the anode of diode D2 and resistor R20. The gate of MOSFET Q2 is connected to the anode of diode D88 and resistor R15. The cathode of diode D2 and the other end of resistor R20 are connected to resistor R4. The cathode of diode D88 and the other end of resistor R15 are connected to resistor R3. The source of MOSFET Q1, the source of MOSFET Q2, capacitor C2, and resistor RS1 are connected to ground. Resistor RS2 and resistor RS3 are connected and grounded. The other ends of resistors R3 and R4 are connected to resistor R24, the emitter of transistor Q15, and the emitter of transistor Q17. The collector of transistor Q15 is connected to one end of capacitor C33. The collector of transistor Q17, the other end of capacitor C33, and resistor R24 ​​are connected and grounded. The base of transistor Q15, the base of transistor Q17, resistor R5, and resistor R10 are connected. The other end of resistor R13 is connected to resistor R7, and resistor R7 is also connected to resistor R2.

4. A stage light switching power supply circuit with constant current drive according to claim 3, characterized in that, The resonant conversion circuit includes an integrated chip U2. Pin 1 of the integrated chip U2 is connected to one end of capacitor C15 and resistor R30. Pin 2 of the integrated chip U2 is connected to resistor R50 and capacitor C16. Pin 3 of the integrated chip U2 is connected to capacitor C17. Pin 4 of the integrated chip U2 is connected to the other end of resistor R39, resistor R58, and resistor R51. Pin 5 of the integrated chip U2 is connected to capacitor C21 and resistor R49. Pin 6 of the integrated chip U2 is connected to capacitor C23 and resistor R58. Pin 7 of the integrated chip U2 is connected to resistor R62 and capacitor C24. Pin 8 of the integrated chip U2 is connected to… The phototransistor U6B is connected to resistor R63, capacitor C25, and the emitter of the phototransistor U6B. The collector of the phototransistor U6B is connected to resistor R57. Resistor R57 is also connected to capacitor C27 and capacitor E5. Pin 9 of the integrated chip U2 is connected to capacitor C11 and the cathode of diode D11. The anode of diode D11 is connected to resistor R47, capacitors CR1 and CR2, and the source of MOSFET Q7 and grounded. Pin 11 of the integrated chip U2 is connected to resistor R44. Pin 14 of the integrated chip U2 is connected to the other end of capacitor C11, capacitor C9, resistor R33, the source of MOSFET Q5, and the drain of MOSFET Q7. The circuit consists of three terminals: inductor L2A and inductor L2B. The other ends of inductors L2A and L2B are connected to inductor T2A. Pin 15 of integrated chip U2 is connected to resistor R32. Pin 16 of integrated chip U2 is connected to the other end of capacitor C9. The other end of resistor R32 is connected to the cathode of diode D7 and resistor R29. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R33 and the gate of MOSFET Q5. The other end of resistor R44 is connected to the cathode of diode D8 and resistor R42. The anode of diode D7 and the other end of resistor R29 are connected to the other end of resistor R47 and the gate of MOSFET Q7. One end of the inductor T2A is connected to capacitors CR1, CR2, and C18. Resistor R49 is connected to resistor R51, capacitor C22, and the collector of phototransistor U5B. Resistor R58 is connected to resistors R60, R61, and capacitor C18. Capacitors C15, R50, C16, C17, R59, C21, C23, R62, C24, R63, C25, pin 10 of integrated chip U2, capacitor C27, capacitor E5, resistors R60, R61, and C22, and the emitter of phototransistor U5B are connected and grounded.

5. A stage light switching power supply circuit with constant current drive according to claim 4, characterized in that, The output rectifier and filter circuit includes terminal CN2, port P1, and port P2. Pin 1 of port P1, pin 1 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, R27, and the cathode of diode D23 are connected to pin 1 of terminal CN2. The anode of diode D23 is connected to inductor T2E. Pins 2 of port P1, pin 2 of port P2, resistors R71, R72, R73, capacitor E4, resistors R25, R26, and R27 are connected and grounded. Pin 3 of terminal CN2 is also connected to the cathode of diode D22, capacitor E6, resistors R41, R48, R64, R65, R98, R97, and R67. The anode of diode D22 is connected to inductors T2C and T2D respectively. Inductor T2C is connected to... The anode of diode D10 and diode D9 are connected by inductor T2D. The cathodes of diode D10 and D9, resistors R70, R69, and R68, capacitors E7 and E8, resistors R36, R37, and R38, capacitor CY4, and capacitor C10 are connected. Capacitor CY4 is also connected to capacitor CY5. The third pin of terminal CN2 is connected to the anode of LED1. The cathode of LED1 is connected to resistor R43. Capacitors E6, R41, R48, R64, R65, R98, R97, R67, R70, R69, and R68, capacitors E7, E8, R43, R36, R37, and R38, capacitor CY5, and capacitor C10 are connected and grounded.

6. A stage light switching power supply circuit with constant current drive according to claim 5, characterized in that, The constant current output circuit includes an integrated chip U8. Pin 1 of the integrated chip U8 is connected to resistor R81 and capacitor C48. Pin 4 of the integrated chip U8 is connected to resistor R82. Pin 2 of the integrated chip U8 is connected to capacitor C49 and resistor R83. Pin 5 of the integrated chip U8 is connected to the cathode of diode DZ7, resistor R78, capacitor C47, and resistor R80. The other end of resistor R80 is connected to the PWM circuit. Pin 6 of the integrated chip U8, capacitor E12, resistors R78, R75, and C46 are connected to the power supply. Pin 7 of the integrated chip U8 is connected to resistors R75, C45, R74, and R66. Pin 8 of the integrated chip U8 is connected to resistor R79. Resistor R74 is connected to pin 1 of adjustable resistor VR2. Capacitors E12 and C60 are connected. Capacitors C60, C64, C65, resistor R81, and the cathode of diode D25 are connected together. Connect pin 1 of port LEDA. Connect pin 2 of port LEDA to inductor L5. Inductor L5 connects the anode of diode D25 and the drain of MOSFET Q14. Connect resistors R85 and R84 to the gate of MOSFET Q14. Connect resistors RS6, RS5, RS4, and R83 to the source of MOSFET Q14. Connect resistor R85 to the emitter of transistor Q18 and the cathode of diode D28. The base of Q18, the anode of diode D28, and resistor R82 are connected. The third and second pins of adjustable resistor VR2, capacitors C45 and C46, ​​resistor R79, capacitor E12, capacitor C60, resistor R66, capacitor C47, the anode of diode DZ7, the third pin of integrated chip U8, capacitors C49 and C48, the collector of transistor Q18, resistor R84, RS6, resistor RS5, and resistor RS4 are connected and grounded.

7. A stage light switching power supply circuit with constant current drive according to claim 6, characterized in that, The output feedback circuit includes a voltage regulator U7 and an adjustable resistor VR1. The cathode of the voltage regulator U7 is connected to capacitor C19, capacitor C20, resistor R56, and the cathode of photodiode U5A. The anode of the voltage regulator U7 is grounded. The anode of the photodiode U5A is connected to resistor R55. Resistors R55, R56, and R53 are connected to the anode of diode DZ3. Capacitor C20 is connected to resistor R54. Resistor R54 is connected to capacitor C19, the reference terminal of voltage regulator U7, resistors R30, R99, R31, R46, and R45. Resistor R45 is connected to pin 3 of the adjustable resistor VR1. Resistor R46 is connected to pin 2 and pin 1 of the adjustable resistor VR1 and grounded.