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| Number | Title | Issue Date |
| 8059431 | Switching power supply An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a load current value detected by detection resistors R7 and R... | 11/15/2011 |
| 8036006 | Power supply circuit having resistance element changing its resistance value to limit current flowing to capacitive load A power supply circuit includes a control circuit which outputs a control signal when an in-rush current flows and a power-supply-resistance control circuit which supplies a current to a capacitive load. The power-supply-resistance control circuit, provided in the c... | 10/11/2011 |
| 8027178 | Power conversion apparatus with adjustable LEB time and over current protection method thereof A power conversion apparatus with adjustable leading-edge-blanking (LEB) time and an over current protection (OCP) method thereof are provided. In the OCP method, a pulse-width-modulation (PWM) signal is generated according to the loading status of an electronic dev... | 09/27/2011 |
| 8018745 | System and method providing over current and over power protection for power converter System and method for protecting a power converter. A system includes a threshold generator configured to generate a threshold signal, and a first comparator configured to receive the threshold signal and a first signal and to generate a comparison signal. The first... | 09/13/2011 |
| RE42674 | Control method and circuit with indirect input voltage detection by switching current slope detection 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 ... | 09/06/2011 |
| 7986537 | Overcurrent-protected switching-mode power supply A DC-to-DC converter having an active switch connected between a pair of DC input terminals via the primary winding of a transformer whose secondary winding is connected to a pair of DC output terminals via a rectifying and smoothing circuit. Operating under the con... | 07/26/2011 |
| 7961485 | Method of forming a PWM controller and structure therefor In one embodiment, a PWM controller is configured to inhibit forming a drive signal responsively to an overload sense signal having a value that is no greater than a first value for a first time interval and to form a first duration of the first time interval respon... | 06/14/2011 |
| 7848124 | Overload and short protected soft-start converter A converter and a driving method thereof are provided. The converter can determine the output short state of the converter after the soft start is finished by using a detection signal that corresponds to an input signal while a switched is turned on and that corresp... | 12/07/2010 |
| 7821800 | Power adapter for providing output power limiting and load-dependent voltage regulation Disclosed is a power adapter having a voltage limiting circuit for limiting an output voltage of the power adapter at a predetermined voltage level when an output current of the power adapter is smaller than a threshold current, and a power limiting circuit for limi... | 10/26/2010 |
| 7800927 | Method and circuit for providing compensations of current mode power converters A method and circuit for providing compensation of a power converter is proposed. A current sense circuit is coupled to receive a switching current for generating a current signal. A signal generation circuit is developed to generate a first compensation signal and ... | 09/21/2010 |
| 7684220 | System and method providing over current and over power protection for power converter System and method for protecting a power converter. A system includes a threshold generator configured to generate a threshold signal, and a first comparator configured to receive the threshold signal and a first signal and to generate a comparison signal. The first... | 03/23/2010 |
| 7619909 | Control circuit for adjusting leading edge blanking time and power converting system using the same control circuit A control circuit for adjusting leading edge blanking time is disclosed. The control circuit is applied to a power converting system. The control circuit adjusts a leading edge blanking time according to a feedback signal relative to a load connected to the output t... | 11/17/2009 |
| 7616461 | Control method and circuit with indirect input voltage detection by switching current slope detection 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 ... | 11/10/2009 |
| 7564704 | Method of forming a power supply controller and structure therefor In one embodiment, a power supply controller is configured to switch a power switch of a power supply when a voltage across the switch is at a minimum value. ... | 07/21/2009 |
| 7525826 | Switching power supply apparatus and method Configurations provide reduction in the hum and the weak shocks that are produced in audio equipments where electrical power is supplied. Switching electrical power sources include, a rectification element that rectifies a current that is supplied, a switching eleme... | 04/28/2009 |
| 7411374 | Circuitry and control method for charging capacitive loads A capacitor charging circuit comprises, power transfer circuitry, power switching control circuitry and voltage measurement circuitry. The power transfer circuitry transfers power from a power source to a capacitor. The power switching control circuitry controls the... | 08/12/2008 |
| 7391629 | Switching mode power supply with controller for handling overcurrents Disclosed is an SMPS for preventing abnormal overcurrents. A circuit having a short circuit delay is used to generate a control signal for turning off a main switch (i.e., a switching MOS transistor) when the overcurrent occurs, that is, in an initial startup or whe... | 06/24/2008 |
| 7388360 | Method and apparatus to provide temporary peak power from a switching regulator Various techniques directed to providing temporary peak power from a switching regulator are disclosed. In one aspect, a switching regulator includes a switch that is to be coupled between a power supply input and an energy transfer element of the power supply. A co... | 06/17/2008 |
| 7375990 | Switching power device Electric current supplied to the primary side winding of a switching transformer is switched to generate ac power respectively in a plurality of secondary side windings of the switching transformer. A switching control signal is optically transmitted depending on th... | 05/20/2008 |
| 7359221 | Power supply for use in an electronic energy meter A three-phase electronic electricity meter that includes a power supply circuit operable to create a constant voltage output when receiving a variable voltage input. The power supply circuit of the electricity meter receives a three-phase line voltage and converts t... | 04/15/2008 |
| 7355867 | Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage Disclosed is an invention relating to a power supply for use in an apparatus for measuring electrical energy, comprising, in one embodiment, a first switching device, a device for storing electrical charge in electrical connection with the first switching device, a ... | 04/08/2008 |
| 7352136 | DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp A DC-DC converter reduces a surge voltage developed across a switching element (30) in making the voltage conversion with the use of a transformer (20) inherently having considerable leakage. A snubber circuit is included to absorb the surge energy and... | 04/01/2008 |
| 7339804 | DC-DC converter A DC-DC converter of the present invention includes: an activation circuit which activates a control circuit for controlling a turning on and off of a switching element; a second rectifying and smoothing circuit which supplies an output voltage, as a power supply, t... | 03/04/2008 |
| 7333353 | Isolating type self-oscillating flyback converter with a soft start loop An isolating type self-oscillating flyback converter is disclosed, which includes a coupled transformer, a FET, a transistor and an electro-optical coupled isolating feedback unit, wherein the input terminal of the circuit is connected to the source of the FET throu... | 02/19/2008 |
| 7301786 | Quasi resonant type switching power supply apparatus with overcurrent limiting A quasi resonant type switching power supplying unit includes an overcurrent limiting circuit and an oscillation level comparison circuit. The overcurrent limiting circuit (i.e., a level determining circuit and a reference voltage generating circuit) receives a reve... | 11/27/2007 |
| 7275002 | Islanding detection and protection method An islanding detection and protection method of a parallel-type power converter is proposed, which performs perturbation to a power system to detect the frequency of the system voltage and the variation of the magnitude of the negative-sequence voltage as the basis ... | 09/25/2007 |
| 7272018 | Switching power supply device and method for controlling switching power supply device By an NMOS (22) being switched on or off, a direct-current voltage E0 is charged in a capacitor (24), and a DC/DC converting circuit (30) charges a direct-current output voltage V0 to be supplied to a load L in a capacitor ... | 09/18/2007 |
| 7254044 | Current limit circuit and power supply including same The present invention is directed generally to a power supply. According to various embodiments, the power supply includes at least one DC/DC converter. The converter includes a primary switch controlled by a pulse width modulated control signal such that the primar... | 08/07/2007 |
| 7248486 | Energy efficient switching converter A switching converter in which an input voltage can be switched by means of at least one controlled switch to at least one primary winding of a transformer, with a control circuit for controlling the switch, to which control circuit a regulating signal in the sense ... | 07/24/2007 |
| 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 |
| 7239119 | Method and apparatus to provide temporary peak power from a switching regulator Various techniques directed to providing temporary peak power from a switching regulator are disclosed. In one aspect, a switching regulator includes a switch that is to be coupled between a power supply input and an energy transfer element of the power supply. A co... | 07/03/2007 |
| 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 |
| 7224590 | Forward converter with synchronous rectifier and reverse current control A control circuit for use in a power converter has a synchronous rectifier for producing substantially direct current, including a sensor for sensing a characteristic of the power converter; detection circuitry capable of using the characteristic to develop a contro... | 05/29/2007 |
| 7215517 | Constant-voltage switching power supply provided with overvoltage output protecting circuit, and electronic apparatus provided with overvoltage protecting circuit An overvoltage output protector is electrically connected to a constant-voltage switching power supply which includes a switching transistor converting a DC voltage obtained by smoothing an AC voltage supplied from an AC power source into a cyclic pulse signal. In t... | 05/08/2007 |
| 7215525 | Overheat protector for a dc-to-dc converter or the like A Schottky barrier diode is employed for temperature sensing, being capable of indicating temperatures above 110° C. or so by the magnitude of its reverse current. The overheat protector is disclosed as incorporated in a dc-to-dc converter in which, connected in se... | 05/08/2007 |
| 7205754 | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one example, a control current is received at a control terminal of a regulator circuit. The control current includes a consumption current of the regulator circuit... | 04/17/2007 |
| 7173831 | Power converter having a primary side switching circuit In one embodiment, an apparatus includes a transformer having a primary winding and a secondary winding and a switching circuit to facilitate a periodic application of an input voltage to the primary winding. The switching circuit includes an active switch and a cap... | 02/06/2007 |
| 7170767 | System and method for regenerative PWM AC power conversion A power conversion system for driving a load is provided. The power conversion system comprises a power transformer having at least one primary winding circuit and at least one secondary winding circuit, the primary winding circuit being electrically connectable to ... | 01/30/2007 |
| 7170309 | TDDB test pattern and method for testing TDDB of MOS capacitor dielectric A Time Dependent Dielectric Breakdown (TDDB) test pattern circuit, which can reduce testing time and statistically improve a precision of measurement as well as a method for testing the test pattern circuit are discussed. Typically, a test pattern circuit includes i... | 01/30/2007 |
| 7158394 | Switching power supply circuit with a soft-start function A switching power supply circuit reduces the time from start-up driving to normal operation while a soft-start is carried out with an output voltage Vout. A soft-start capacitor is charged during the start-up time. After a soft-start voltage Vz has reached a predete... | 01/02/2007 |
