http://www.freshpatents.com/Electric-power-conversion-systems-dtnewntc363.php USPTO Class 363 - Electric power conversion systems en-us Thu, 24 Jul 2008 15:03:25 -0700 1000 Wednesday Thursday Friday Saturday Sunday 141 31 http://www.freshpatents.com/index.php?rss=true http://www.freshpatents.com/images/freshpatentsnav_rss.gif http://www.freshpatents.com/Adjustable-shunt-regulator-with-soft-start-reference-dt20080717ptan20080170417.php Thu, 24 Jul 2008 15:03:25 -0700 An adjustable shunt regulator comprises an operational amplifier, a transistor having a base terminal operatively connected to the output of the operational amplifier, a diode operatively connected in parallel with the transistor, and a voltage reference connected to the inverting input of the operational amplifier. The operational amplifier provides an... http://www.freshpatents.com/Dc-dc-converter-dt20080717ptan20080170418.php Thu, 24 Jul 2008 15:03:25 -0700 A DC-DC converter includes a resonant coil (Lr) for zero voltage switching, the resonant coil being connected in series to a primary winding (Np), and a full-bridge switching circuit driven by phase shift control. The DC-DC converter includes a first regenerative diode (D7) disposed between a connection between the primary... http://www.freshpatents.com/Active-peak-voltage-limiting-clamp-circuit-dt20080717ptan20080170419.php Thu, 24 Jul 2008 15:03:25 -0700 The present invention discloses an active peak voltage-limiting clamp circuit, which comprises a primary switch unit and a secondary switch unit that are used to control the coil current of a transformer, wherein a signal acquisition unit, a zero-point decision unit, a feedback unit and a pulse control unit are... http://www.freshpatents.com/Method-and-control-circuit-with-input-voltage-detection-for-the-control-and-protection-of-power-converter-dt20080717ptan20080170420.php Thu, 24 Jul 2008 15:03:25 -0700 The present invention provides a method and a control circuit to detect an input voltage for the control and protections of a power converter. It includes a current sense circuit for generating a current signal in response to a switching current of a transformer. A detection circuit is coupled to... http://www.freshpatents.com/Malfunction-determining-device-for-drive-circuit-and-drive-unit-including-the-same-and-method-for-determining-malfunction-in-drive-circuit-dt20080717ptan20080170421.php Thu, 24 Jul 2008 15:03:25 -0700 A device and method for determining whether a malfunction is present in a drive circuit, which drives an electric device that generates counter-electromotive force, when all gates in the switching elements of the drive circuit are blocked. After the gates are blocked, the temperature of the switching elements is monitored... http://www.freshpatents.com/Power-on-off-control-architecture-for-power-supply-dt20080717ptan20080170422.php Thu, 24 Jul 2008 15:03:25 -0700 The present invention provides a power on/off control architecture for a power supply so as to control the power on/off of the power supply. The power supply includes a rectifying unit, a standing power system, a PWM (Pulse Width Modulation) controller and a main power system. The standing power system... http://www.freshpatents.com/Ac-dc-transformation-and-voltage-stabilizing-circuit-dt20080717ptan20080170423.php Thu, 24 Jul 2008 15:03:25 -0700 A AC/DC transformation and voltage stabilizing circuit comprising a high voltage coupling capacitor, a bridge rectifying circuit, a voltage comparison circuit, a switch controlling circuit, a capacitor filtering, and a storage circuit; when the circuit is in use, the voltage of input AC power source will be reduced by said...