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| Number | Title | Issue Date |
| 8120931 | Power converter with control circuit and related control method A control circuit for use in a power converter has a multi-function terminal, a current comparator circuit, and an under-voltage detection circuit. The current comparator circuit compares current flowing through a power switch of the power converter with a reference... | 02/21/2012 |
| 8068353 | Switching mode power supply circuit A switching mode power supply (SMPS) circuit includes: a rectifying unit that rectifies an AC voltage applied from an AC input terminal; a power factor correction (PFC) and standby voltage output unit that is connected to the rectifying unit and has a PFC part and a... | 11/29/2011 |
| 8004863 | Circuit device and method of providing feedback across an isolation barrier In an embodiment, a circuit device includes a network interface responsive to a powered network to receive a power supply and data and includes an electrical isolation barrier adapted to define a non-isolated power domain and an isolated power domain. The circuit de... | 08/23/2011 |
| 7835163 | Switching power converter with a secondary-side control This invention discloses a power converter with a secondary-side control, including an input circuit with one or more switches, an output circuit with an output end and a controller, and a transformer with a primary-side coil assembly connecting the switch(es) and a... | 11/16/2010 |
| 7817445 | Computer power supply A power supply for a computer includes a transformer, a rectifier, a pulse width modulation (PWM) controller, a relay, a power switch, and a battery. The PWM controller includes a voltage terminal and a pulse terminal. The relay includes a switch and an inductance c... | 10/19/2010 |
| 7782634 | Switched-mode power supply and power supplying method thereof A switched-mode power supply includes a converter to convert input power into output power having a predetermined voltage level by performing a switching operation; a switching controller to control the switching operation of the converter based on an indication of ... | 08/24/2010 |
| 7773392 | Isolated switching power supply apparatus A primary side is provided with an oscillation circuit arranged to turn on a power switch at a constant cycle. The secondary side is provided with an on period control circuit arranged to output an off signal for turning the power switch off by detecting output volt... | 08/10/2010 |
| 7440295 | Switching mode power supply with active load detection function, and switching method thereof A switching mode power supply (SMPS) with an active load detection function which supplies AC power input to a primary coil of a transforming element, then to a secondary coil of the transforming element, and then rectifies and outputs the AC power is provided. The ... | 10/21/2008 |
| 7433208 | Switching power supply device and electronic apparatus A switching power supply device includes a primary winding of a transformer that is connected in series to a first switching element, and a secondary winding is provided with a rectifier circuit and an output voltage control circuit arranged to detect an output volt... | 10/07/2008 |
| 7414865 | Controller having output current control for a power converter A controller controls the output current by measuring and controlling the switching current of the power converter. A first circuit generates a first signal in accordance with the switching current. A second circuit detects a discharge-time of the transformer. A thi... | 08/19/2008 |
| 7415072 | Drive control for an electric drive with a secure electrical separation of power element and control element The invention relates to a drive control for an electric drive with a secure electrical separation of power element and control element. The aim of the invention is to reduce the number of components such as optic couplers and buffer amplifiers between the power ele... | 08/19/2008 |
| 7400517 | Power factor correction circuit and method therefor In one embodiment, a power factor correction circuit is configured to use a stored value of a feedback signal to assist in regulating the value of an output voltage and to bypass the sample and hold circuit if the output voltage increase to an upper limit or decreas... | 07/15/2008 |
| 7382062 | Wide voltage range stabilized switching power supply for valve actuators The invention finds application in the field of power supplies for valve actuators, and particularly relates to a wide voltage range stabilized switching power supply for valve actuators, of the type that comprises a filter 2, a diode bridge 3, an arra... | 06/03/2008 |
| 7365500 | Display device having lamp control circuit A driving device is provided, which includes: a switching unit directly connected to a first voltage from a source external to the driving device; a transforming unit indirectly connected to the switching unit for transforming the first voltage into a second voltage... | 04/29/2008 |
| 7358685 | DC-DC converter having protective function of over-voltage and over-current and led driving circuit using the same The invention relates to a DC-DC converter having over-current/over-voltage protection function and an LED driving circuit using the same. The DC-DC converter adjusts a width of a switching pulse outputted from a Pulse Width Modulation (PWM) controller to control on... | 04/15/2008 |
| 7345894 | Cascode switch power supply A switching power supply is disclosed for improving the no-load power drain of low-power mains operated supplies. The power converter utilizes a cascoded switch arrangement with a conventional high voltage power MOSFET and a low voltage, low gate charge MOSFET. Driv... | 03/18/2008 |
| 7345431 | Circuit structure for driving a plurality of cold cathode flourescent lamps A DC/AC converter circuit structure for driving a plurality of cold cathode fluorescent lamps is described. A common-mode choke is used between the cold cathode fluorescent lamps. The common-mode choke balances the currents respectively flowing through the cold cath... | 03/18/2008 |
| 7339806 | Adjustment device for adjusting wave shape of output of a DC-AC inverter A DC-AC inverter has an adjustment device for adjusting wave shape of output thereof includes a feedback circuit, and a zero-crossing detector; the feedback circuit will detect and measure output voltage of the inverter, and feedback-control the inverter to make the... | 03/04/2008 |
| 7336057 | DC/DC converter A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in accordance with a second control signal; a current sensor that detects an o... | 02/26/2008 |
| 7328357 | Electronic apparatus with switching power supply controlled to stop main circuit voltage and reduce microcomputer voltage during standby mode In a configuration in which supply of a first operating power source to a main circuit part is stopped at the time of shifting to a standby mode, at the time of shifting to the standby mode, a voltage of a second operating power source is lowered to a voltage which ... | 02/05/2008 |
| 7315162 | Reducing power consumption of electrical meters The invention contemplates an electrical power meter and method of operating the electrical power meter. The inventive power meter includes a power supply for converting alternating current (AC) voltage to a direct current (DC) voltage for powering the electronic co... | 01/01/2008 |
| 7312614 | Commutator for power supply testing A commutator for power supply testing includes a printed circuit board (PCB), a plurality of connectors soldered on the PCB and coupling a power supply with an electronic load, a plurality of indicator light showing whether the power supply coupled to the commutator... | 12/25/2007 |
| 7295450 | Primary-controlled SMPS with adjustable switching frequency for output voltage and current control The present invention relates to a method for controlling the output voltage of a primary-controlled switched-mode power supply unit having a primary-side switch and a transformer with an auxiliary winding in which an auxiliary voltage which images the output voltag... | 11/13/2007 |
| 7295449 | Simple switched-mode power supply with current and voltage limitation This invention relates to a primary-controlled switched-mode power supply of the type of a free-running flyback converter, which comprises a transformer with a primary-side winding, a secondary-side winding and at least one auxiliary winding. The switched-mode power... | 11/13/2007 |
| 7289339 | Inverter circuit for inhibiting electricity transmission interference An inverter circuit for inhibiting electricity transmission interference receives an electric signal output from an electricity input circuit, and includes a control unit to output an operating frequency, an actuation circuit to receive the operating frequency and d... | 10/30/2007 |
| 7289340 | Switching power supply device A novel switching power supply device no more in need of a stand-by signal for turning on/off a switching element is provided. The switching power supply device is configured as having a main switching element Q1, wherein the switching power supply circuit is connec... | 10/30/2007 |
| 7285989 | Device for detection of power-off A power-off detection device is formed without use of a photo coupler, which is expensive and occupies a relatively large area. The power-off detection device rectifies AC power, provided as external input power from a power supply device, into DC power, detects the... | 10/23/2007 |
| 7285912 | Organic electroluminescence device having transparent control layer with low ambient reflection and enhanced contrast An organic electroluminescence device with a low reflectivity includes organic electroluminescence layers, a transparent electrode, a thin metal electrode, a control layer, and an auxiliary electrode. The transparent electrode and the thin metal electrode are sited ... | 10/23/2007 |
| 7259948 | Power supply device for driving A power supply device for driving has a switching control circuit that switches a switching element for a power source, and an output voltage generation portion that generates a predetermined output voltage in accordance with the switching of the switching element f... | 08/21/2007 |
| 7250694 | Power-saving control module for an electrical appliance In a power-saving control module for an electrical appliance that includes a DC power supply and a remote control receiver, a switch component serves to make or break electrical connection between an AC power source and the DC power supply, a diode provides a path f... | 07/31/2007 |
| 7245510 | Method and apparatus for conditional response to a fault condition in a switching power supply Techniques are disclosed to regulate an output of a power converter. One example power converter includes an energy transfer element coupled between an input and an output of the power converter. A switch included in the power converter is coupled to the input of th... | 07/17/2007 |
| 7245896 | Apparatus for improving reception sensitivity of public wave receiver by reducing noise externally-emitted in the public wave receiver An apparatus for improving reception sensitivity of a public wave receiver includes power devices formed in a power supply of the public wave receiver, and a shielding plate for shielding noise generated by the power devices. A signal line for connecting an antenna ... | 07/17/2007 |
| 7239533 | DC power supply apparatus A DC power source device comprises a MOS-FET 5 which performs the intermittent switching operation for converting DC input from a DC power supply 1 into high frequency electric power; a control circuit 9 for turning MOS-FET 5 on and off; ... | 07/03/2007 |
| 7236337 | Drive power supply and fail determination method A drive power supply for generating inverter drive voltages has a switching control circuit that switches a switching element on a primary side of a transformer to generate drive voltages on the secondary side in connection with the switching of switching elements o... | 06/26/2007 |
| 7236086 | Power converter configuration, control, and construction A transformer having galvanically isolated windings defines a primary side and a secondary side of a power conversion apparatus. A switch couples power from a source on the primary side via the transformer to a load on the secondary side. A first circuit assembly ha... | 06/26/2007 |
| 7236376 | Controller for regulating output current at the primary side of a power supply A controller controlling the output current at the primary side of a power supply is provided. A waveform detector generates a current-waveform signal. A second control circuit generates an oscillation signal for determining the switching frequency of a switching si... | 06/26/2007 |
| 7227350 | Bias technique for electric utility meter The invention contemplates an electrical power meter and method of operating the same, where the meter has electronic components (e.g., a power supply and a voltage sensing circuit) and receives alternating current (AC) voltage from an electrical power line. The inv... | 06/05/2007 |
| 7221558 | Galvanically isolated delivery of power to high voltage circuits parts A high voltage switching apparatus delivers kV pulses to a load such as a magnetron. The switching apparatus comprises a switching stack surrounded by capacitors and both arranged within a housing. Lt power is supplied to the stack, e.g. for control electronics, by ... | 05/22/2007 |
| 7222034 | In-circuit measurement of saturation flux density Bsat, coercivity Hc, and permiability of magnetic components using a digital storage oscilloscope An oscilloscope performs an in-circuit measurement of voltage across, and current through, a core winding of an inductor, and derives the actual B and H values with n number of turns, receives data indicative of the magnetic length of the circuit, and plots the B_H ... | 05/22/2007 |
| 7218060 | Flyback ballast for fluorescent lamp A flyback ballast for fluorescent lamps is provided. A transformer is utilized to control the power delivered to the lamp. A first switch is coupled to the first winding of the transformer. A first filter is coupled to a second filter through a first terminal pair o... | 05/15/2007 |
