Dimming chip, dimming control circuit and lighting equipment

The utility model discloses a light modulation chip, a light modulation control circuit and a lighting device, the light modulation chip generates a PWM light modulation signal by detecting a voltage value on a direct current bus and a peak current in a grounding loop of a light emitting drive circuit, and associates the duty ratio of the PWM light modulation signal with the voltage value on the direct current bus. Brightness dimming of the lamp is realized by identifying the change of the voltage value on the direct current bus (when the voltage value on the direct current bus rises, the brightness of the lamp is increased; otherwise, the brightness is reduced). As a user can change the brightness of the plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control does not need to be carried out on each lamp independently, the operation is simple, and the user experience is high. 本实用新型公开了一种调光芯片、调光