Abstract: The proposed soft-switching DC/DC converter includes a converter circuit including a main switch having a first, a second and a control terminals for converting an input DC voltage to an output DC voltage, a resonant circuit electrically connected to the converter circuit, and an energy transferring circuit including an auxiliary switch having a first, a second and a control terminals and magnetically coupled to the resonant circuit. In which, the main switch is turned on under a specific voltage across the first and the second terminals of the main switch and the auxiliary switch is turned off under a specific current flowing through the first and the second terminals of the auxiliary switch both controlled by the resonant circuit through a resonance effect so as to accomplish a soft-switching of the converter.

Abstract: A shade roller assembly includes a rotatable mechanism connected to one of two extensions of a frame and a positioning assembly is connected to the other extension of the frame. A connection tube extends from the rotatable mechanism and is securely inserted in one end of a hollow roller. The other end of the hollow roller is connected to an insertion piece of the positioning assembly. Each of the connection tube and the insertion piece has two flanges which are engaged with one of six sides of the polygonal inner periphery of the roller. A shade body has an end thereof fixed to the roller and the roller includes six axial edge lines so that the end of the shade body is convenient to align with either one of the edge lines.

Abstract: A soft-switched boost converter includes an active snubber to provide soft switching of all semiconductor components. Specifically, the current (“turn-off current”) in the rectifier is switched off at a controlled rate, the main switch is closed under zero-voltage switching (ZVS) condition, and the auxiliary switch in the active snubber is opened under zero-current switching (ZCS) condition. As a result, switching losses are reduced with beneficial effects on conversion efficiency and EMC performance.

Abstract: The proposed converter includes: three boost inductors, three filter capacitors, six main switch modules each having a switch element, a diode and a resonant capacitor, two auxiliary switches, two main diodes, a resonant inductor, and two output capacitors. A control circuit is employed for generating driving signals from six SPWM signals to drive the six main switches and the two auxiliary switches of the converter. A six-step control method is employed to adjust the SPWM signals and a soft-switching method is employed to generate the driving signals to turn on/off the six main switch modules and the two auxiliary switches when the voltage on the second terminal of each main switch module/auxiliary switch is zero and the current flows into each auxiliary switch is zero to correct the power factor.

Abstract: The proposed soft-switching DC/DC converter includes: a basic non-isolated DC/DC converter having an inductor, and an auxiliary switch module including: an auxiliary switch having a first terminal electrically connected to a first terminal of the inductor, a second terminal, and a control terminal, a resonant inductor having a first terminal electrically connected to the second terminal of the auxiliary switch, a resonant diode having a cathode electrically connected to a second terminal of the resonant inductor and an anode electrically connected to a second terminal of the inductor, and a main switch. A driving signal is input to the control terminals of the main and the auxiliary switches from a driving circuit to switch the main and the auxiliary switches at a zero-voltage and a zero-current so as to have zero switching loss respectively.

Abstract: A soft-switched boost converter includes an active snubber to provide soft switching of all semiconductor components. Specifically, the current (“turn-off current”) in the rectifier is switched off at a controlled rate, the main switch is closed under zero-voltage switching (ZVS) condition, and the auxiliary switch in the active snubber is opened under zero-current switching (ZCS) condition. As a result, switching losses are reduced with beneficial effects on conversion efficiency and EMC performance.

Abstract: The proposed converter includes: three boost inductors, three filter capacitors, six main switch modules each having a switch element, a diode and a resonant capacitor, two auxiliary switches, two main diodes, a resonant inductor, and two output capacitors. A control circuit is employed for generating driving signals from six SPWM signals to drive the six main switches and the two auxiliary switches of the converter. A six-step control method is employed to adjust the SPWM signals and a soft-switching method is employed to generate the driving signals to turn on/off the six main switch modules and the two auxiliary switches when the voltage on the second terminal of each main switch module/auxiliary switch is zero and the current flows into each auxiliary switch is zero to correct the power factor.

Abstract: The DC-to-DC converter including a boost converter circuit, a resonant circuit, and an active power sink circuit is provided. The boost converter circuit has a main switch for boosting a first DC voltage into a second DC voltage. The resonant circuit includes a unidirectional switch, a resonant capacitor, and a first winding of a transformer for causing the main switch to be controlled to exhibit near zero voltage switching. And, the active power sink circuit is magnetically coupled to the first winding of the transformer for draining energy in an inductance of the transformer off via magnetic induction between the active power sink circuit and the transformer, and causing the unidirectional switch to be controlled to exhibit near zero current switching.

Abstract: The DC-to-DC converter including a boost converter circuit, a resonant circuit, and an active power sink circuit is provided. The boost converter circuit has a main switch for boosting a first DC voltage into a second DC voltage. The resonant circuit includes a unidirectional switch, a resonant capacitor, and a first winding of a transformer for causing the main switch to be controlled to exhibit near zero voltage switching. And, the active power sink circuit is magnetically coupled to the first winding of the transformer for draining energy in an inductance of the transformer off via magnetic induction between the active power sink circuit and the transformer, and causing the unidirectional switch to be controlled to exhibit near zero current switching.

Abstract: A zero voltage, zero current switching power factor correction converter includes a boost unit including a first switch, a second switch and a resonant circuit at least having two energy storage elements, wherein the resonant unit is operatively configured to alternatively discharge electric energy from one of the energy storage elements to a load, a boost unit having a boost choke for receiving an AC voltage, a rectifying circuit coupled between the boost choke and the resonant unit, a third switch and a fourth switch respectively connected across one of the energy storage elements, and a power factor correction controller for respectively enabling the first switch and the second switch to turn on and off when a current flowing through the first switch is zero and a current flowing through the second switch is zero, and respectively enabling the third switch and the fourth switch to turn on and off when a voltage across the third switch is zero and a voltage across the fourth switch is zero.

Abstract: A zero voltage, zero current switching boost converter is provided. The boost converter includes an input coupled to an input inductor, a main switch coupled to the input inductor that conducts currents through the input inductor to store energy in said input inductor, and a resonant circuit coupled to the main switch for conducting currents from the input to an output of the boost converter which includes a first series circuit of a first auxiliary switch and a second auxiliary switch coupled to the main switch, a second series circuit of a first output capacitor and a second output capacitor in parallel with the first series circuit, and a resonant inductor interposed between the first series circuit and the second series circuit that forms a first discharge loop and a second discharge loop to make the main switch turn on and off under a substantial zero voltage, wherein both the first auxiliary switch and the second auxiliary switch are turned on and off under a substantial zero current circumstance.

Abstract: A zero voltage, zero current switching power factor correction converter comprises a boost unit including a first switch, a second switch and a resonant circuit at least comprising two energy storage elements, wherein the resonant unit is operatively configured to alternatively discharge electric energy from one of the energy storage elements to a load, a boost unit comprising a boost choke for receiving an AC voltage, a rectifying circuit coupled between the boost choke and the resonant unit, a third switch and a fourth switch respectively connected across one of the energy storage elements, and a power factor correction controller for respectively enabling the first switch and the second switch to turn on and off when a current flowing through the first switch is zero and a current flowing through the second switch is zero, and respectively enabling the third switch and the fourth switch to turn on and off when a voltage across the third switch is zero and a voltage across the fourth switch is zero.

Abstract: A zero voltage, zero current switching boost converter comprises a boost section including a main switch for receiving a first DC power and outputting a second DC power, and a resonant circuit comprising a first discharge loop including a first auxiliary switch and a second discharge loop including a second auxiliary switch for permitting the first DC power to discharge alternately through the first discharge loop and the second discharge loop to a load to generate the second DC power, and the boost converter is characterized by the main switch is turned on and off under a zero voltage circumstances and both the first auxiliary switch and the second auxiliary switch are turned on and off under a zero current circumstances, thereby reducing switching loss incurred herewith, suppressing electromagnetic interference and radio frequency interference of the resonant circuit, and miniaturizing the switch element and obtaining a better overall conversion efficiency.

Abstract: An expedient and simplified uninterrupted power-supplying apparatus is provided. Such apparatus includes a power-storing device for storing an electric signal in a first instance and releasing the electric signal in a second instance, an AC/DC converting device for converting an AC signal provided by the power source into a DC signal, a DC/DC converting device for receiving the DC signal, and generating the uninterrupted power and storing the electric signal in the power-storing device in response to a voltage thereof in the first instance, and receiving the released electric signal and generating the uninterrupted power in the second instance, and a controlling device for controlling the DC/DC converting device to store the electric signal in the power-storing device and making the AC/DC converting device vary the DC signal in response to the voltage of the power-storing device. The invention also discloses a method for supplying an uninterrupted power.

Abstract: The present invention is related to an uninterrupted power supply providing a power for a load. The present uninterrupted power supply includes a rectifying device receiving and rectifying an input power signal for generating first rectified signal; first and a second charge/discharge devices electrically connected to the rectifying device, and alternately executing a charge/discharge operation in response to the first rectified signal; first and second voltage supply devices respectively electrically connected to the first and the second charge/discharge devices, respectively receiving charges from the first and the second charge/discharge devices for being kept at a stable electrical potential level, and outputting a voltage signal for providing the power for the load; and a power reservoir receiving and storing therein the input power signal and outputting a reserve power signal serving as the input power signal to the rectifying device when there is no subsequent input power signal inputted.