Non-isolated LED dimming circuit with PWM and DIM dimming
A dimming circuit, non-isolated technology, applied in the field of LED dimming, can solve the problems of complex and incompatible peripheral circuits, and achieve the effect of high chip isolation
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[0021] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings, taking two-way LED and other lighting circuits as an example, without limitation.
[0022] Such as figure 1 As shown, the non-isolated LED dimming circuit with PWM and DIM dimming of the present invention includes an LED lighting circuit and a dimming circuit; the lighting circuit includes two LED lamps, and each lamp tube is connected in parallel with a capacitor, resistor and inductor at both ends , There is a Schottky tube between the inductor and the LED lamp. The inductance is discharged through the Schottky tube and the LED lamp, and this discharge time is the demagnetization time.
[0023] The dimming circuit includes a high-voltage to low-voltage module, a demagnetization time detection module, a switch control module, a peak detection module, and two dimming signal input terminals; each dimming signal input terminal is compatible with D...
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