Light regulatable LED illumination lamp
A dimming LED lamp having an LED light, an EMI circuit, a power-factor correction circuit, a digital switching power supply circuit, a dimming control circuit, a power supply circuit, a signal acquisition circuit, an MCU microcontroller, a RF wireless transmitter, a RF receiver circuit, an EEPROM memorizer, and a fan circuit. The brightness of the dimmable LED lamp can be dimmed through any conventional incandescent dimmers, or through any ordinary key switch, or through a wireless transmitter. The wireless transmitter can also remotely turn on the lamps or turn off the lamps, at the same time the LED lamp also has the function of brightness saving. The fan circuit uses air convection to cool the LED which has the advantages of aesthetically pleasing appearance, small size, light weight, low cost, long life, and good cooling effect.
1. A dimmable LED lamp, comprising
a LED lamp having a signal input;
an EMI circuit having a signal input and a signal output, the signal input being connected to two ends of an external power supply via a conventional dimmer, for providing surge-absorption protection and lightning-resistance protection;
a power-factor correction circuit having a signal input and a signal output, the signal input of the power-factor correction unit being connected to the signal output of the EMI circuit;
a digital switching power supply circuit having a signal input and a signal output, the signal input of the digital switching power supply circuit being connected to the signal output of the power-factor correction circuit, for providing regulated D.C. power supply to the LED lamp and PWM signals;
a dimming control circuit, having a signal input connected to the signal output of the digital switching power supply circuit, for providing different working voltages according to the PWM signals received from the digital switching power supply circuit, the output signal of the dimming control circuit being connected to the signal input of the LED lamp;
a power supply circuit, having a signal input and output, the signal input of the power supply circuit being connected to the signal output of the digital switching power supply circuit, for providing a regulated current to a MCU microcontroller, a EEPROM memorizer and a RF receiver circuit;
a signal acquisition circuit, having a signal input and an output, the signal input of the signal acquisition circuit being connected to the output of the EMI circuit and the output of the signal acquisition circuit being connected to the MCU microcontroller; the MCU microcontroller, having an output connected to the signal input of the dimming control circuit, the MCU microcontroller being able to judge whether the LED lamp is connected with two ends of the external power supply according to signals received from the signal acquisition circuit, the MCU microcontroller also being able to control widths of the PWM signals;
a RF wireless transmitter for transmitting wireless signals for dimming the LED lamp;
the RF receiver circuit, having an output, for receiving the wireless signals from the RF wireless transmitter, the output of the RF receiver circuit being connected to the MCU microcontroller;
the EEPROM memorizer, connected to the MCU microcontroller, for saving a current luminance of the LED lamp; and
a fan circuit connected to the output of the power supply circuit.
2. The dimmable LED lamp of claim 1 , wherein the signal acquisition circuit is composed of two serial resistors, the output of the signal acquisition circuit is connected to a zero-crossing detection pin of the MCU microcontroller.
3. The dimmable LED lamp of claim 1 or 2 , wherein the LED lamp is composed of a plurality of high-power LEDs connected in series.