LED constant voltage dimming power supply and LED lamp dimming system manufacturing method
2019-08-22 18:38:50
The utility model relates to an LED power source, in particular to an LED constant voltage dimming power supply and an LED lamp dimming system.
LED drivers With the continuous development of LED lighting, LED power supply has also achieved a corresponding development. In particular, as lighting needs continue to diversify, LED lamps are required to have different brightness in different scenarios. Therefore, it is also required that the LED power source can change the output power in response to the dimmer, thereby changing the brightness of the LED lamp.
LED power supply One of the ways in which dimming is achieved in the prior art is to change the current and thus the power of the LED load. However, with the dimming method of changing the current, on the one hand, the load can only be limited to the resistor-limited LED load, and when the built-in DC-DC driven LED load and the linear constant current LED load are connected, the lamp flicker will be generated. phenomenon. On the other hand, due to the existence of the circuit's own resistance, the use of changing the current regulation mode causes a large difference in current between multiple loads (such as a soft band with multiple LEDs) during dimming to produce brightness adjustment. Inconsistent phenomenon. Therefore, the
LED power supply adopting such a dimming method is not versatile and the dimming effect is poor in consistency.
In view of this, the utility model provides an LED constant voltage dimming power supply and a LED lamp dimming system with strong versatility and good dimming effect, to solve the above technical problems.
300W 12v LED constant voltage dimming power supply, used to change the duty cycle of its output constant voltage when receiving the control signal of the dimmer, and includes a constant voltage source for outputting constant voltage. The LED constant voltage dimming power supply further includes a damping bleeder circuit module electrically connected to the input end of the constant voltage source, and a phase detecting circuit module electrically connected to the output end of the constant voltage source, A duty cycle control module coupled to the phase detection circuit module, and a switch transistor electrically coupled to the duty cycle control module. The damper bleeder circuit module is configured to stabilize a current of a normal operation of the dimmer when the dimmer is turned on. The phase detection circuit module is configured to sample an output voltage of the constant voltage source and convert the voltage sampling signal into a first duty cycle signal. The duty cycle control module converts the first duty cycle signal into a second duty cycle signal adapted to control the switch. The switch tube changes the duty ratio of the output constant voltage of the
LED constant voltage dimming power supply according to the second duty ratio signal to change the output power.
400W driver LED luminaire dimming system, including a dimmer for output voltage phase-cut signal, and one of the LED constant voltage dimming power supplies. The LED constant voltage dimming power supply is used to change the duty ratio of the output constant voltage when receiving the control signal of the dimmer, and includes a constant voltage source for outputting a constant voltage. The LED constant voltage dimming power supply further includes a damping bleeder circuit module electrically connected to the input end of the constant voltage source, and a phase detecting circuit module electrically connected to the output end of the constant voltage source, A duty cycle control module coupled to the phase detection circuit module, and a switch transistor electrically coupled to the duty cycle control module. The damper bleeder circuit module is configured to stabilize a current of a normal operation of the dimmer when the dimmer is turned on. The phase detection circuit module is configured to sample an output voltage of the constant voltage source and convert the voltage sampling signal into a first duty cycle signal. The duty cycle control module converts the first duty cycle signal into a second duty cycle signal adapted to control the switch. The switch tube changes the duty ratio of the output constant voltage of the LED constant voltage dimming power supply according to the second duty ratio signal to change the output power.
Compared with the prior art, the LED constant voltage dimming power supply of the present invention changes the output power by adjusting the duty ratio of the output constant voltage to adjust the brightness of the LED lamp, instead of dimming by the current limiting mode. Therefore, the LED constant voltage dimming power supply can be applied to a plurality of different LED lamps, so that the LED constant voltage dimming power source has high versatility. In addition, the voltage between the LED constant voltage dimming power supply and each LED luminaire does not vary with the increase or decrease of the number of LED illuminators, thereby ensuring uniform brightness adjustment of each LED luminaire. Sex.
