Patent ID: 10602580

Abstract:
The invention relates to a constant voltage dimming power supply for lighting device, which is used for adjusting output voltage regulated by dimmer to realize constant voltage PWM output, including a rectifying circuit performing rectifier filtering to output voltage regulated by dimmer; a constant voltage circuit electrically connected to output end of the rectifying circuit; a constant current load circuit electrically connected to output end of the rectifying circuit; a frequency conversion and protection sampling circuit electrically connected to output end of the constant current load circuit and constant voltage; and a switching circuit for controlling lighting load illumination; the frequency conversion and protection sampling circuit converts an output signal of the constant current load circuit into a duty cycle signal suitable for controlling the switching circuit and detects the output abnormality of the constant voltage circuit in real time, and the switching circuit is controlled to be turned on and off accordingly. Compared with the prior art, the constant voltage dimming power supply provided by the invention can provide a stable current and voltage and can well protect the lighting load.