A high voltage linear constant current pwm photoelectric isolation receiver

Abstract

The invention discloses a high-voltage linear constant-current PWM photoelectric isolation receiving end, which includes a dimming control module, a filter rectification module and a high-voltage linear constant-current module, and the dimming control module is connected to the high-voltage linear constant-current module through a dimming signal terminal One end of the filtering and rectifying module is connected to the AC mains, and the other end is connected to a high-voltage linear constant-current module, and the high-voltage linear constant-current module is connected to at least one group of parallel-connected LEDs and their circuits. The invention discloses a high-voltage linear constant current PWM photoelectric isolation receiving end. The two ends of the dimming control module isolated by the optocoupler U1 avoid direct electrical connection, which not only effectively prevents the internal high-voltage control circuit from being connected to the external low-voltage circuit. Interference caused by electrical connections can also prevent electric shock. In addition, the duty cycle of the output terminal can be changed by adjusting the input terminal, and the output current can be adjusted to achieve the purpose of accurately adjusting the load LED power.

Description

Technical field [0001] The invention belongs to the field of electronic information technology, and particularly relates to a high-voltage linear constant current PWM photoelectric isolation receiving end. Background technique [0002] Linear constant current drive circuit can convert AC circuit to DC circuit and can be directly used to drive LED. It is gradually applied to LED lighting application field and can directly replace the driving power supply and greatly reduce the manufacturing cost of the whole lamp. However, the current linear constant current drive circuits generally use ordinary IC chips to drive, and the drive current is controlled by the IC chip. The IC chip’s drive output capacity is limited and 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 the superposition of multiple IC chips, which will lead to excessive application of IC chips, so that when the i...

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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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