High-voltage linear constant current PWM (Pulse Width Modulation) photoelectric isolation receiving end

Abstract

The invention discloses a high-voltage linear constant current PWM (Pulse Width Modulation) photoelectric isolation receiving end, comprising a dimming control module, a filter rectifier module and a high-voltage linear constant current module, wherein the dimming control module is connected with the high-voltage linear constant current module via a dimming signal end, one end of the filter rectifier module is connected with the alternating-current mains supply, the other end of the filter rectifier module is connected with the high-voltage linear constant current module, and the high-voltage linear constant current module is connected with at least one group of LEDs (Light Emitting Diodes) connected in parallel and a circuit thereof. According to the high-voltage linear constant current PWM photoelectric isolation receiving end, two ends of the dimming control module isolated by a photo-coupler U1 avoid direct electrical connection, so that interference caused by electrical connection between an internal high-voltage control circuit and an external low-voltage circuit is effectively prevented, and static electricity can also be prevented. In addition, the duty cycle of the output end can be changed by adjusting the input end, and the magnitude of the output current can be adjusted, so that the purpose of adjusting the power of the load LEDs is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of electronic information, in particular to a high-voltage linear constant-current PWM photoelectric isolation receiving end. Background technique [0002] The linear constant current drive circuit can convert the AC circuit into a DC circuit, which can be directly used to drive LEDs. It is currently gradually applied in the field of LED lighting applications, and can directly replace the driving power supply, greatly reducing the manufacturing cost of the whole lamp. However, the current linear constant current drive circuits are generally driven by ordinary IC chips. The driving current is controlled by the IC chip, and the drive output capability of the IC chip is limited, so it cannot output high-voltage linear constant current drive current. In order to obtain The high-voltage linear constant current drive current will be output by superimposing multiple IC chips, which will lead to excessive applicatio...

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Problems solved by technology

[0003] In order to overcome the flickering, light-off and stroboscopic problems caused by voltage fluctuations in the existing high-voltage linear constant-current drive LED lamps, the present invention provides a high-voltage linear constant-current PWM photoelectric isolation receiving end, including a dimming control module, a filter rectifier module and a high-voltage linear constant-current module, the dimming control module is connected to the high-voltage linear constant-current module through the dimming signal terminal, one end of the filter rectifier module is connected to the AC mains, and the other end is connected to the high-voltage linear constant-current module, and the high-voltage linear The constant current module is connected with at least one group of LEDs connected in parallel with each other and its loop

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