Dual-channel constant-current adjustable light driving power supply

Abstract

The utility model provides a kind of two-way constant current adjustable light drive power supply, including two-way constant current output circuit and control module.Control module is equipped with state switching timer, three-grade dimming circuit and reset circuit.Three-grade dimming circuit controls MOSFET switch tube by first, second path PWM drive circuit, adjusts pulse duty cycle to realize "100% -60% -100%" brightness cycle and output channel switching, simplifies dimming operation.State switching timer triggers dimming within set time, and memory duty cycle state before turning off light if timeout;Reset circuit is forced to unify two-way dimming state by specific switch-on operation.Compared with the problem that traditional drive power supply dimming is complex and state management is inconvenient, the drive power supply realizes convenient dimming, state memory and multi-device synchronization by the cooperation of each circuit, improves use efficiency and flexibility.

Description

Technical Field

[0001] This utility model relates to the field of driving power supply technology, and in particular to a dual-channel constant current adjustable light driving power supply. Background Technology

[0002] Existing dual-channel constant-current dimmable drivers typically include dual-channel constant-current output circuits and a control module. Their core function is to provide a stable current output to two sets of LED loads and control brightness by adjusting the current. These drivers often employ PWM drive circuits or analog dimming methods, with some products supporting dimming via external dimmers (such as 0-10V controllers or DALI protocol modules) or intelligent control systems. However, the control modules in existing technologies often rely on complex hardware connections or external signal inputs, exhibiting limitations in dimming logic, state memory, and multi-device collaborative control.

[0003] Currently, the main problems faced by existing dual-channel constant current drive power supplies in practical applications are: complex dimming operation procedures and lack of flexibility in state management. Specifically, when it is necessary to switch the brightness level or channel of the dual output, an additional dimming controller or complex system configuration is usually required, which is difficult to achieve through a simple switch operation; at the same time, when the lights are turned off and then turned on again, the power supply cannot remember the previous dimming state and needs to be readjusted to the target brightness. In the scenario of multiple lights being used in parallel, if the states of each power supply are inconsistent, manual adjustment is required for each one, resulting in low efficiency and increased cost. Utility Model Content

[0004] The main purpose of this utility model is to provide a dual-channel constant current dimmable driver power supply, which aims to achieve dual-channel brightness cyclic adjustment, light-off state memory, and multi-lamp fast synchronization functions based on simple switch operation by integrating a state switching timer, a three-level dimming circuit, and a reset circuit control module design.

[0005] To achieve the above objectives, this utility model proposes a dual-channel constant current dimmable driver power supply, including a dual-channel constant current output circuit and a control module. The control module includes a state switching timer, a three-level dimming circuit, and a reset circuit.

[0006] The three-level dimming circuit includes a first PWM drive circuit and a second PWM drive circuit. The first PWM drive circuit and the second PWM drive circuit are electrically connected to the dual constant current output circuit. The first PWM drive circuit and the second PWM drive circuit control their output MOSFET switching transistors and adjust the pulse duty cycle to achieve brightness cycling of 100%, 60%, and 100% and adjust the output channel of the dual constant current output circuit.

[0007] The state switching timer is used to trigger the three-level dimming circuit to adjust the pulse duty cycle when the lights are turned on or off within a set time. If the lights are turned off for more than the set time, the pulse duty cycle of the three-level dimming circuit before the lights are turned off is memorized.

[0008] The reset circuit is used to forcibly adjust the pulse duty cycle of the three-level dimming circuit when setting the light switch operation.

[0009] In one possible implementation, the state switching timer includes an RC oscillation timing circuit that detects the on / off signal of a switch through a resistor divider network and triggers a timing window.

[0010] In one possible implementation, the state switching timer further includes an EEPROM storage unit or an energy storage capacitor to memorize the duty cycle of the three dimming circuit pulses before the light is turned off, and to recall the memorized duty cycle of the three dimming circuit pulses when the light is turned on.

[0011] In one possible implementation, the reset circuit is implemented through an edge detection circuit and a logic gate circuit. When a specific switch signal is detected in the light-on state, a synchronous reset signal is output to the dual-channel constant current output circuit.

[0012] In one possible implementation, the dual constant current output circuit employs an independent closed-loop feedback system, with each channel including a current sampling resistor, a PID controller, and a flyback isolation transformer.

[0013] In one possible implementation, the control module further includes an active PFC circuit, consisting of a Boost inductor, an IGBT switch, and a PFC control IC.

[0014] The working principle and beneficial effects of this utility model are as follows:

[0015] This utility model's technical solution integrates a state switching timer, a three-level dimming circuit, and a reset circuit into the control module. The three-level dimming circuit controls the corresponding MOSFET switches through the first and second PWM drive circuits, adjusting the pulse duty cycle to achieve brightness cycles of "100%, 60%, 100%" and output channel adjustment of the dual-channel constant current output circuit. This eliminates the need for an additional dimming controller, simplifying the dimming operation process. The state switching timer uses an RC oscillation timing circuit, detecting the switch on / off signal through a resistor voltage divider network. When the lights are switched on or off within a set time, it triggers the three-level dimming circuit to adjust the pulse duty cycle. When the lights are off for more than the set time, it remembers the pulse duty cycle state before the lights were off, achieving state memory after the lights are off. The reset circuit forcibly adjusts the pulse duty cycle of the three-level dimming circuit to a uniform state when setting the light-on / off operation, achieving rapid synchronization when multiple lights are used in parallel. This solves the problems of complex dimming operation, inflexible state management, and low efficiency of multi-device collaborative debugging in the prior art with dual-drive power supplies. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of the present utility model;

[0018] Figure 2 This is a block diagram of the three-level dimming circuit structure in this utility model.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] like Figures 1-2 As shown, this embodiment proposes a dual-channel constant current dimmable driver power supply, including a dual-channel constant current output circuit and a control module. The control module includes a state switching timer, a three-level dimming circuit, and a reset circuit.

[0022] The three-level dimming circuit includes a first PWM drive circuit and a second PWM drive circuit. The first PWM drive circuit and the second PWM drive circuit are electrically connected to the dual constant current output circuit. The first PWM drive circuit and the second PWM drive circuit control their output MOSFET switching transistors and adjust the pulse duty cycle to achieve brightness cycling of 100%, 60%, and 100% and adjust the output channel of the dual constant current output circuit.

[0023] The state switching timer is used to trigger the three-level dimming circuit to adjust the pulse duty cycle when the lights are turned on or off within a set time. If the lights are turned off for more than the set time, the pulse duty cycle of the three-level dimming circuit before the lights are turned off is memorized.

[0024] The reset circuit is used to force the pulse duty cycle of the three-level dimming circuit to be adjusted when the light switch operation is set.

[0025] The dual-channel constant current output circuit provides stable constant current output for two sets of loads, ensuring stable operation under different working conditions and preventing current fluctuations from affecting load performance. It also supports coordination with the dimming circuit in the control module, enabling flexible switching and brightness adjustment of the dual outputs to meet diverse load driving needs. The control module integrates a state switching timer, a three-level dimming circuit, and a reset circuit, coordinating the work of each part. By unifying the operating logic of each circuit, it ensures the orderly implementation of dimming, memory, and reset functions, improving the overall integration and control efficiency of the drive power supply, simplifying the circuit structure, and enhancing operational stability. The state switching timer senses the on / off operation within a set time and triggers the three-level dimming circuit to adjust the pulse duty cycle, allowing dimming to be completed with a simple on / off action. When the light is off for more than the set time, the pulse duty cycle state before turning off is retained, and this state is directly restored when the light is turned on again, reducing repetitive adjustment operations and improving ease of use. The three-level dimming circuit controls corresponding MOSFET switches through a first and second PWM drive circuit, respectively. By adjusting the pulse duty cycle, it creates a brightness cycle of 100%, 60%, and 100%, while simultaneously switching the output channels of the dual constant current output circuit. This eliminates the need for an additional controller, enabling dynamic adjustment of brightness and output channels, simplifying operation and enhancing application flexibility. Specifically, upon initial power-on, the first channel outputs a 100% pulse width; after one switch, both channels simultaneously output a 60% pulse width; and after another switch, the second channel outputs a 100% pulse width, following a cyclical logic. The MOSFET switches receive control signals from the PWM drive circuit and adjust the pulse duty cycle of the output current by switching between on and off states, thereby achieving brightness adjustment. Its rapid switching characteristics ensure precise and efficient pulse duty cycle adjustment, resulting in smooth and stable brightness changes, improving dimming accuracy and response speed. When triggered by the set light switch operation, the reset circuit forces the pulse duty cycle of the three dimming circuits to be adjusted to a uniform state, which solves the problem of inconsistent states that may occur when multiple loads are linked. The load states can be synchronized without manual debugging, reducing the workload of debugging and improving system coordination.

[0026] In this embodiment, the state switching timer includes an RC oscillation timing circuit that detects the on / off signal of the switch through a resistor voltage divider network and triggers the timing window. The state switching timer also includes an EEPROM storage unit or an energy storage capacitor to memorize the duty cycle of the three dimming circuit pulses before the light is turned off, and to recall the memorized duty cycle of the three dimming circuit pulses when the light is turned on.

[0027] The state switching timer uses an RC oscillation timing circuit. It detects the on / off signal of the switch through a resistor voltage divider network and triggers the timing window to ensure accurate perception and timing control of the switch operation. This makes the dimming trigger timing stable and reliable. At the same time, it is equipped with an EEPROM storage unit or energy storage capacitor to retain the pulse duty cycle of the first three dimming circuits after the light is turned off. When the light is turned on, the memory parameters are directly called, avoiding repeated adjustments, simplifying the operation process, and improving the ease of use and state recovery efficiency.

[0028] In this embodiment, the reset circuit is implemented through an edge detection circuit and a logic gate circuit. When a specific switch signal is detected in the light-on state, a synchronous reset signal is output to the dual-channel constant current output circuit.

[0029] The reset circuit uses an edge detection circuit to capture changes in the switch signal and, together with a logic gate circuit, determines the validity of the signal. When a specific switch signal is identified in the light-on state, a synchronous reset signal is sent to the dual constant current output circuit to ensure that the multiple outputs quickly return to a unified state. This avoids the tedious debugging caused by inconsistent states and improves the stability and operational efficiency of multi-device collaborative work.

[0030] In this embodiment, the dual constant current output circuit adopts an independent closed-loop feedback system, and each channel includes a current sampling resistor, a PID controller and a flyback isolation transformer.

[0031] The dual-channel constant current output circuit relies on an independent closed-loop feedback system. It monitors the output current in real time through the current sampling resistor configured in each channel and feeds the signal back to the PID controller. The PID controller dynamically adjusts the output to maintain current stability. It is equipped with a flyback isolation transformer to achieve electrical isolation between input and output. This ensures that the two output currents do not interfere with each other and are accurate and reliable, while also enhancing circuit safety. It meets the stable current requirements of different loads and improves the adaptability and operational safety of the drive power supply.

[0032] In this embodiment, the control module also includes an active PFC circuit, which consists of a Boost inductor, an IGBT switch, and a PFC control IC.

[0033] The active PFC circuit in the control module stores and releases energy through the Boost inductor, and adjusts the input current waveform in conjunction with the high-speed switching of the IGBT switch. Under the overall control of the PFC control IC, the input current and voltage phase tend to be consistent, improving the power factor, reducing grid harmonic pollution, reducing energy loss, and enhancing the adaptability of the power supply in a wide voltage input range, ensuring efficient and stable operation of the drive power supply, and adapting to different grid environments.

[0034] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-channel constant current adjustable light driver power supply, comprising a dual-channel constant current output circuit and a control module, characterized in that, The control module includes a state switching timer, a three-level dimming circuit, and a reset circuit; The three-level dimming circuit includes a first PWM drive circuit and a second PWM drive circuit. The first PWM drive circuit and the second PWM drive circuit are electrically connected to the dual constant current output circuit. The first PWM drive circuit and the second PWM drive circuit control their output MOSFET switching transistors and adjust the pulse duty cycle to achieve brightness cycling of 100%, 60%, and 100% and adjust the output channel of the dual constant current output circuit. The state switching timer is used to trigger the three-level dimming circuit to adjust the pulse duty cycle when the lights are turned on or off within a set time. If the lights are turned off for more than the set time, the pulse duty cycle of the three-level dimming circuit before the lights are turned off is memorized. The reset circuit is used to forcibly adjust the pulse duty cycle of the three-level dimming circuit when setting the light switch operation.

2. The dual-channel constant current adjustable light drive power supply according to claim 1, characterized in that, The state switching timer includes an RC oscillation timing circuit that detects the on / off signal of the switch through a resistor voltage divider network and triggers the timing window.

3. The dual-channel constant current adjustable light drive power supply according to claim 1, characterized in that, The state switching timer also includes an EEPROM storage unit or an energy storage capacitor to remember the duty cycle of the three dimming circuit pulses before the light is turned off, and to recall the remembered duty cycle of the three dimming circuit pulses when the light is turned on.

4. The dual-channel constant current adjustable light drive power supply according to claim 1, characterized in that, The reset circuit is implemented through an edge detection circuit and a logic gate circuit. When a specific switch signal is detected in the light-on state, a synchronous reset signal is output to the dual-channel constant current output circuit.

5. A dual-channel constant current adjustable light drive power supply according to claim 1, characterized in that, The dual-channel constant current output circuit adopts an independent closed-loop feedback system, and each channel includes a current sampling resistor, a PID controller, and a flyback isolation transformer.

6. The dual-channel constant current adjustable light drive power supply according to claim 1, characterized in that, The control module also includes an active PFC circuit, which consists of a Boost inductor, an IGBT switch, and a PFC control IC.

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