Compact and efficient sine constant current dimmer and control method thereof

Abstract

The invention relates to a compact and efficient sine constant current dimmer and a control method thereof. The sine constant current dimmer comprises a digital signal processing unit, a drive circuit, an input filter circuit, an uncontrolled rectifying circuit, a full-bridge inverter circuit, an output filter circuit and an isolated boost transformer. According to the sine constant current dimmer, only low-capacity buffer absorption capacitor needs to be arranged, so that the sine constant current dimmer is compact in structure, high in power density and power conversion efficiency and stableand reliable in working, and power unit modularization is easy to implement. Compared with a traditional sine constant current dimmer of employing an AC-DC-AC two-stage transformation topology, the compact and efficient sine constant current dimmer has the advantages that intermediate voltage is pulsating DC instead of constant DC, so that a high-capacity DC bus capacitor is omitted, a high-frequency rectifying circuit does not need to be arranged, and the power density of equipment and the grid-side power quality are greatly improved. Compared with a sine constant current dimmer of employingan AC-AC single-stage transformation topology, the compact and efficient sine constant current dimmer has a natural continuous-flow channel, and the load adaptability and the system reliability are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics engineering, in particular to a compact and efficient sinusoidal constant current dimming device. Background technique [0002] At present, there is a distributed dimming scheme with built-in low-voltage and low-power dimming devices in lighting fixtures. The problem with this scheme is that the working current of the lamps is difficult to be completely consistent, and there are differences in illuminance between lamps. In addition, the structure of the entire lighting system is complex, and it is difficult to meet the requirements of high reliability of the lighting system. It is understood that there is a relatively mature phase-controlled dimming scheme for navigation lighting in the field of civil aviation. This scheme connects multiple isolation transformers in series with the navigation lighting circuit on the secondary side of the step-up transformer to ensure that the current flo...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low power density and poor load adaptability of existing AC-DC-AC and AC-AC chopping sinusoidal constant current dimming schemes, and to provide a compact, efficient, good comprehensive performance and easy-to-use Realized sinusoidal constant current dimming device

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