Abstract: A primary-controller with voltage compensation function applied to a primary side of a power converter includes a gate control signal generation circuit, and the gate control signal generation circuit includes a clamping unit and a driving unit. The gate control signal generation circuit is coupled to a power switch installed in the primary side of the power converter, and is used for enabling a gate control signal, wherein the gate control signal is used for making the power switch turned on. The clamping unit generates a compensation voltage according to a clamping voltage. The driving unit is coupled between the clamping unit and a gate of the power switch, and used for generating the gate control signal according to the compensation voltage. The clamping voltage is changed with a detection voltage of a detection resistor coupled to the power switch accordingly.

Abstract: A controller applied to a power converter is installed in a primary side of the power converter. The controller includes a capacitor, an adjustment signal generation circuit, and a discharge circuit. The capacitor is used for generating a tracking voltage. The adjustment signal generation circuit is used for generating an adjustment signal according to a feedback voltage and the tracking voltage. The discharge circuit is used for discharging the capacitor according to the feedback voltage and the adjustment signal. The tracking voltage is used for tracking a state of a magnetizing current of a magnetizing inductor of the primary side of the power converter, and when the tracking voltage consists with the state of the magnetizing current, the tracking voltage is applied to at least one of zero-voltage switching (ZVS) control and quasi-resonant (QR) control of the power converter.

Abstract: A method includes forming a dielectric layer over a conductive feature, and etching the dielectric layer to form an opening. The conductive feature is exposed through the opening. The method further includes forming a tungsten liner in the opening, wherein the tungsten liner contacts sidewalls of the dielectric layer, depositing a tungsten layer to fill the opening, and planarizing the tungsten layer. Portions of the tungsten layer and the tungsten liner in the opening form a contact plug.

Abstract: An optical device package comprises a carrier having a first surface and a second surface recessed with respect to the first surface and a lid disposed on the second surface of the carrier.

Abstract: An optical system applied to an optical biometer is disclosed. The optical system includes a light source, first and second switchable reflectors, and first and second fixed reflectors. The first switchable reflector is disposed corresponding to the light source. The second switchable reflector is disposed corresponding to an eye. In a first mode, the first and second switchable reflectors are switched to a first state, and the incident light emitted by the light source is reflected by the first fixed reflector along a first optical path and then emitted to a first position of the eye. In a second mode, the first and second switchable reflectors are switched to a second state, and the incident light is sequentially reflected by the first switchable reflector, the second fixed reflector and the second switchable reflector along a second optical path and then emitted to a second position of the eye.

Abstract: A controller applied to a power converter is installed in a primary side of the power converter. The controller includes a capacitor, an adjustment signal generation circuit, and a discharge circuit. The capacitor is used for generating a tracking voltage. The adjustment signal generation circuit is used for generating an adjustment signal according to a feedback voltage and the tracking voltage. The discharge circuit is used for discharging the capacitor according to the feedback voltage and the adjustment signal. The tracking voltage is used for tracking a state of a magnetizing current of a magnetizing inductor of the primary side of the power converter, and when the tracking voltage consists with the state of the magnetizing current, the tracking voltage is applied to at least one of zero-voltage switching (ZVS) control and quasi-resonant (QR) control of the power converter.

Abstract: A controller applied to a primary side of an inductor-inductor-capacitor (LLC) resonant converter includes a common-mode voltage generation circuit and a control signal generation circuit. The common-mode voltage generation circuit is used for generating a common-mode voltage. The control signal generation circuit is used for generating an upper bridge switch control signal and a lower bridge switch control signal according to a compensation voltage corresponding to an output voltage of the LLC resonant converter, a sensing voltage corresponding to an input voltage of the LLC resonant converter, and the common-mode voltage, wherein the upper bridge switch control signal and the lower bridge switch control signal control an upper bridge switch and a lower bridge switch of the primary side of the LLC resonant converter, respectively.

Abstract: A controller applied to a primary side of an inductor-inductor-capacitor (LLC) resonant converter includes a common-mode voltage generation circuit and a control signal generation circuit. The common-mode voltage generation circuit is used for generating a common-mode voltage. The control signal generation circuit is used for generating an upper bridge switch control signal and a lower bridge switch control signal according to a compensation voltage corresponding to an output voltage of the LLC resonant converter, a sensing voltage corresponding to an input voltage of the LLC resonant converter, and the common-mode voltage, wherein the upper bridge switch control signal and the lower bridge switch control signal control an upper bridge switch and a lower bridge switch of the primary side of the LLC resonant converter, respectively.

Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.

Abstract: A power controller disclosed is for the use of a power converter with an inductive to regulate an output power source. The power controller has a PWM signal generator and a jitter inducer. The PWM signal generator controls a power switch to generate consecutive switching cycles. In each switching cycle the PWM signal generator controls a peak to regulate the output power source, and the peak is capable of representing a current flowing through the inductive device. The jitter inducer, connected to the PWM signal generator, is for altering the peak, so as to make a difference between two consecutive peaks. The difference has a sign and a magnitude. The jitter inducer makes the sign changed switching cycle by switching cycle.

Abstract: A power converter using an active-clamp flyback topology has a low-side switch, a high-side switch and a control circuit. The low-side switch connects a primary winding of a transformer to an input ground line, and the high-side switch is connected in series with a capacitor to form an active-clamp circuit connected in parallel with the primary winding. The control circuit provides high-side and low-side signals to the high-side and the low-side switches respectively, in response to a current-sense signal and a compensation signal. The control circuit is configured to operate the power converter in one of operation modes including a complementary mode and a non-complementary mode. When operated in the complementary mode, the high-side signal and the low-side signal are substantially complementary to each other, and the control circuit exits the complementary mode in response to the current-sense signal to enter the non-complementary mode.

Abstract: A power controller makes use of a line-voltage detection method to perform brown-out protection and brown-in mechanism. The power controller has a high-voltage node connected via a current-limiting resistor to a line voltage, and a high-voltage startup transistor connected to the high-voltage node. The input voltage at the high-voltage node is divided to provide a fraction result. An offset current flowing through the high-voltage startup transistor and the current-limiting resistor is provided in response to the fraction result. The offset current is stopped in response to the fraction result when the offset current flows through the high-voltage startup transistor and the current-limiting resistor.

Abstract: A power controller disclosed is for the use of a power converter with an inductive to regulate an output power source. The power controller has a PWM signal generator and a jitter inducer. The PWM signal generator controls a power switch to generate consecutive switching cycles. In each switching cycle the PWM signal generator controls a peak to regulate the output power source, and the peak is capable of representing a current flowing through the inductive device. The jitter inducer, connected to the PWM signal generator, is for altering the peak, so as to make a difference between two consecutive peaks. The difference has a sign and a magnitude. The jitter inducer makes the sign changed switching cycle by switching cycle.

Abstract: A control method for a power convert is disclosed. The power convert uses an active-clamp flyback topology and has low-side and high-side switches. The low-side switch is switched to generate consecutive switching cycles including a modified flyback cycle and a normal flyback cycle. Each of the consecutive switching cycles is not less than a blanking time generated in response to a load of the power converter. The high-side switch is constantly turned OFF during the normal flyback cycle. The high-side switch is turned ON after the blanking time during the modified flyback cycle to perform zero-voltage switching for the low-side switch.

Abstract: A control method for a power convert is disclosed. The power convert uses an active-clamp flyback topology and has low-side and high-side switches. The low-side switch is switched to generate consecutive switching cycles including a modified flyback cycle and a normal flyback cycle. Each of the consecutive switching cycles is not less than a blanking time generated in response to a load of the power converter. The high-side switch is constantly turned OFF during the normal flyback cycle. The high-side switch is turned ON after the blanking time during the modified flyback cycle to perform zero-voltage switching for the low-side switch.

Abstract: A power converter using an active-clamp flyback topology has a low-side switch, a high-side switch and a control circuit. The low-side switch connects a primary winding of a transformer to an input ground line, and the high-side switch is connected in series with a capacitor to form an active-clamp circuit connected in parallel with the primary winding. The control circuit provides high-side and low-side signals to the high-side and the low-side switches respectively, in response to a current-sense signal and a compensation signal. The control circuit is configured to operate the power converter in one of operation modes including a complementary mode and a non-complementary mode. When operated in the complementary mode, the high-side signal and the low-side signal are substantially complementary to each other, and the control circuit exits the complementary mode in response to the current-sense signal to enter the non-complementary mode.

Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.

Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.

Abstract: Herein is disclosed a control method suitable for a switching mode power supply. A power switch is controlled according to a clock signal to transfer electrical energy from an input power source to an output power source. A feedback signal is provided in response to an output voltage of the output power source. A clock signal is generated in response to the feedback signal and an input voltage of the input power source. The clock signal has a clock frequency determining a switching frequency of the power switch. When the feedback signal exceeds a relatively-high level, the clock frequency increases in response to decrease to the input voltage. When the feedback signal is below a relatively low level, the clock frequency is independent from the input voltage.

Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.