| POWER FOREST TECHNOLOGY CORPORATION Patent applications |
| Patent application number | Title | Published |
|---|
| 20120106215 | POWER CONVERSION APPARATUS AND BROWN-OUT PROTECTION METHOD THEREOF - A power conversion apparatus and a brown-out protection method are provided. The brown-out protection method includes sampling a rectification signal relating to an AC voltage received by the power conversion apparatus by adopting a discrete sampling means; and when a peak value of the sampled rectification signal has reached to a predetei mined value within a predetermined duration, making a pulse width modulation (PWM) control chip in the power conversion apparatus provide a PWM signal to switch a power switch in the power conversion apparatus, and thereby making the power conversion apparatus provide an output voltage to an electronic device; otherwise, making the PWM control chip to stop providing the PWM signal. | 05-03-2012 |
| 20120056865 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode (LED) driving apparatus is provided, which includes a power conversion circuit for receiving and converting an input power so as to generate a DC voltage to simultaneously drive a plurality of LED strings arranged in parallel; and a plurality of current regulation chips each having a single regulation channel and respectively corresponding to the LED strings, wherein an i | 03-08-2012 |
| 20120008342 | POWER CONVERSION APPARATUS AND OVER CURRENT PROTECTION METHOD THEREOF - A power conversion apparatus and an over current protection (OCP) method thereof are provided. The OCP method includes generating a pulse-width-modulation (PWM) signal according to a loading status of an electronic device, so as to switch a power switch in the power conversion apparatus and thus making the power conversion apparatus providing an output voltage to the electronic device; generating an OCP reference signal with variable slope according to a feedback signal related to the loading status of the electronic device and a system operation voltage of a PWM controller chip in the power conversion apparatus that is used for generating the PWM signal; and comparing a sensing voltage corresponding to a current following through the power switch on a resistor, and the OCP reference signal with variable slope to determine whether to activate an OCP mechanism to control the PWM controller chip whether to generate the PWM signal. | 01-12-2012 |
| 20110285440 | FREQUENCY JITTER CONTROLLER FOR POWER CONVERTER - A frequency-jitter-controller for a power-converter is provided, and which includes a first and a second capacitance units, a first and a second charge-discharge control units, a comparing unit and a control unit. Both capacitance units are charged to a crossing-voltage during a charging phase and discharged to a reference voltage and a clamp voltage respectively during a discharging-phase in response to operations of both charge-discharge control units. The comparing unit outputs a pulse signal, compares voltages of both capacitance units during the charging phase, and compares the voltage of the first capacitance unit and the reference voltage during the discharging phase. The control unit generates a frequency jitter control signal according to the pulse signal to adjust a rising rate of the voltage on the second capacitance unit, so as to change a frequency of the pulse signal, and thus reduce EMI generated by switching switch-elements in the power-converter. | 11-24-2011 |
