Patent application number | Description | Published |
20160139300 | METHOD FOR PRODUCING A LOW TEMPERATURE GLASS PHOSPHOR LENS AND A LENS PRODUCED BY THE SAME - A method for producing a low temperature glass phosphor lens includes dry mixing a glass material and fluorescent powder to form a powdery or particulate mixture. The mixture is grinded to a diameter of 15-20 μm, obtaining uniformly mixed glass fluorescent powder. The glass fluorescent powder is hot pressed into a glass phosphor at a temperature of 500-1000° C. The glass phosphor is grinded and polished into a lens. The fluorescent powder can be a fluorescent material selected from the group consisting of yttrium aluminum garnet, nitride, and silicate. The glass material can be selected from the group consisting of a silicate system, a phosphor system, a borate system, and a tellurate system. The glass phosphor includes characteristics of both of glass and fluorescence. The glass phosphor can keep efficiency under the high heat generated by the chip of an LED. | 05-19-2016 |
20160139401 | GLASS PHOSPHOR COLOR WHEEL AND METHODS FOR PRODUCING THE SAME - A glass phosphor color wheel includes a wheel body made of a glass phosphor formed by sintering a glass material and fluorescent powder. The fluorescent powder is a fluorescent material selected from the group consisting of yttrium aluminum garnet, nitride, silicate, aluminate, and oxynitride. The glass material is selected from the group consisting of a silicate system, a phosphor system, a borate system, and a tellurate system. A method for producing a glass phosphor color wheel includes concentrically placing an inner tube into an outer tube. The glass material and the fluorescent powder are placed between the outer and inner tubes and are formed into a wheel body. In another method, the glass material and the fluorescent powder are sintered at a temperature of 500-1000° C. to form at least one glass phosphor color block that is subsequently coupled to a substrate to form a glass phosphor color wheel. | 05-19-2016 |
Patent application number | Description | Published |
20090121696 | Controller of DC-DC Converter And Controlling Method Thereof - A PWM controller of a DC-DC converter is provided. The DC-DC converter converts an input voltage into an output voltage and comprises an output inductor coupled between an output of the DC-DC converter and a phase node. A first sense circuit senses a signal from the phase node to generate a first signal corresponding to the input voltage. A second sense circuit senses the signal from the phase node to generate a second signal corresponding to the output voltage. A PWM generator controls a first transistor and a second transistor of the DC-DC converter according to the first and second signals. The first transistor is coupled between the input voltage and the phase node, and the second transistor is coupled between the phase node and a ground. | 05-14-2009 |
20090267573 | Power Supplies, Power Supply Controllers, And Power Supply Controlling Methods - A power supply controller is provided. The power supply controller includes a switching device, an inductor, a comparator, and a sensing device. The switching device is coupled to an input power source and switches according to a comparing result. The inductor is coupled between the switching device and an output terminal, and conducts an inductor current. The comparator is coupled to the output terminal, a reference power source and a bias voltage, compares the voltage level of the output voltage and the reference voltage, and outputs the comparing result according to the bias voltage. The sensing device is coupled to the inductor and the comparator, senses the inductor current, generates a sensed voltage according to the inductor current, and adjusts the bias voltage according to the sensed voltage. | 10-29-2009 |
20110031948 | DC-DC CONVERTER - A DC-DC converter including a Pulse Width Modulation (PWM) controller for converting an input voltage into an output voltage is provided. The PWM controller includes an error amplifier, a comparator, a PWM generator and a ramp generator. The error amplifier generates an error signal according to a difference between a reference voltage and the output voltage. The comparator compares the error signal with a ramp signal to generate a trigger signal. The PWM generator generates a PWM signal with a fixed turn-on time, wherein a frequency of the PWM signal is adjusted according to the trigger signal, the input and output voltages. The ramp generator generates the ramp signal according to the PWM signal, the input voltage and the output voltage. | 02-10-2011 |
20130147456 | DC-DC CONVERTER - A DC-DC converter including a Pulse Width Modulation (PWM) controller for converting an input voltage into an output voltage is provided. The PWM controller includes: an error amplifier, receiving a reference voltage and a feedback voltage and provides an error signal; a compensation unit coupled to an output of the error amplifier, compensating the error signal and comprising a first resister and a first capacitor; a ramp generator, generating a ramp signal according to a constant on time PWM signal; a first comparator coupled to the compensation unit and the ramp generator, comparing the compensated error signal with the ramp signal to generate a trigger signal; and a PWM generator coupled to the first comparator, providing the constant on time PWM signal according to the trigger signal, an input voltage of the DC-DC converter and the output voltage of the DC-DC converter. | 06-13-2013 |
20140084891 | DC-DC CONVERTER - A DC-DC converter including a Pulse Width Modulation (PWM) controller for converting an input voltage into an output voltage is provided. The PWM controller includes a first comparator, receiving a compensated error signal and a ramp signal, wherein when the compensated error signal exceeds the ramp signal, the first comparator generates a trigger signal. The PWM controller further includes a PWM generator coupled to the first comparator, providing a timing signal according to the trigger signal to control the operation of the DC-DC converter. | 03-27-2014 |