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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 7432690 | Dual circuit wall switch occupancy sensor and method of operating same A method and apparatus are provided for detecting occupancy in an area using multiple detection technologies (e.g., ultrasound and infrared sensing) to intelligently control switching of plural load circuits whereby one of the circuits is affected by photocell contr... | 10/07/2008 |
| 7420827 | Self oscillating inrush current limiting converter There is disclosed a power converter having limited inrush current and an inrush current limiter circuit. The inrush limiting circuit may be a self-oscillating switching-mode average current regulator tp provide a relatively constant average charging current to a bu... | 09/02/2008 |
| 7379311 | Inrush current control circuit An inrush current control circuit includes a first and second control units connected in series, wherein the first and second control units all have a current limiting resistor and switch connected in parallel. The current limiting resistor of the first control unit... | 05/27/2008 |
| 7358712 | Power supply control circuit and control method thereof A power supply control circuit includes: a conducting part configured to be controllable in its a conducting amount for conducting a power supply current to a load circuit; a current change ratio detecting part detecting a change rate of the power supply curr... | 04/15/2008 |
| 7355368 | Efficient in-rush current limiting circuit with dual gated bidirectional hemts A boost converter in accordance with an embodiment of the present application includes an input rectifying bridge adapted to rectify an input AC voltage, a first inductor connected to the input rectifying bridge, a output capacitor coupled to first inductor for conn... | 04/08/2008 |
| 7304456 | Input inrush current control and/or output short-circuit control to a boost converter in a power supply An electronic circuit is connected between input lines of an alternating input power supply and input lines of a boost converter to limit an input inrush current and/or an output short-circuit current supplied to the boost converter in a power supply. The electronic... | 12/04/2007 |
| 7279873 | Current-limited protection circuit of switching power converter A switching power converter comprises a switch, a pulse width modulation (PWM) circuit, a rectifying filter circuit and a current limited protection circuit. The input terminal of the rectifying filter circuit is coupled to an input voltage via the switch. The curre... | 10/09/2007 |
| 7276883 | Self-driven synchronous rectified boost converter with inrush current protection using bidirectional normally on device A boost converter in which the conventional boost diode is replaced by a bidirectional normally conducting semiconductor switch. The circuit may be implemented so the bidirectional switch is self-driven by connecting a low voltage Schottky diode between a first gate... | 10/02/2007 |
| 7274179 | Inrush current preventing circuit There is provided an inrush current preventing circuit. The circuit comprises an voltage-controlled type switching device that has an input terminal, an output terminal and a control terminal that limits current between the input terminal and the output terminal by ... | 09/25/2007 |
| 7266000 | Controlled inrush current limiter An improved inrush current limiting circuit provides continuous control of current delivered to a filter capacitor based on the charge state of the filter capacitor. ... | 09/04/2007 |
| 7230409 | Current limiting using PWM control A method and a system for current limiting using PWM control have been provided. The method includes sensing a load current to produce a control voltage. The control voltage is compared with a reference voltage to produce a detected output signal. Thereafter, the de... | 06/12/2007 |
| 7224154 | System and method for adjusting the current limit of a power supply A system and method is providing for adjusting the current limit of a power supply. The current limit is set at a level that corresponds to the maximum flow of amperage that is within the bounds of the power characteristics of the input line to the power supply.... | 05/29/2007 |
| 7196502 | Switching regulator having soft start circuit A switching regulator has a soft start circuit having a current source, a capacitor, and a MOS transistor connected between the current source and the capacitor for undergoing controlled operations between ON/OFF states to control a time period required for soft sta... | 03/27/2007 |
| 7196503 | Current averaging circuit for a PWM power converter A current averaging circuit for averaging a piecewise linear switching current waveform of a PWM power converter including first, second and third sample and hold circuits and a sample averaging circuit. The first sample and hold circuit samples a short duration of ... | 03/27/2007 |
| 7116537 | Surge current prevention circuit and DC power supply A surge current prevention circuit and DC power supply for preventing surge current in various operation applications with a small circuit configuration. A power switch connects an external power supply and a load. A first PMOS transistor is connected to a constant ... | 10/03/2006 |
| 7112943 | Enabling circuit for avoiding negative voltage transients An enabling circuit for enabling a DC—DC converter having a capacitor coupled to an output terminal of the DC—DC converter to be controlled by a control signal. The enabling circuit may include a comparison circuit configured to compare a feedback signal represe... | 09/26/2006 |
| 7110271 | Inrush current prevention circuit for DC-DC converter An inrush current prevention circuit for a DC-DC converter is provided and in preferred aspects comprises a switching element that transforms an input voltage by being switched on and off and outputs the transformed voltage. A filter filtrates the outputted voltage,... | 09/19/2006 |
| 7079647 | IP telephone with power source circuit An IP telephone has a power source circuit. A direct current from a network is used to charge an input capacitor via an input current limiting resistor. A resultantly charged voltage is inputted to and is converted by a DC/DC converter to produce an output voltage. ... | 07/18/2006 |
| 7072192 | Power circuit restraining rush current A power circuit for an electronic machine includes first and second step-up circuits, and a voltage applier. The first step-up circuit has a step-up transformer and a current controller. The current controller controls the amount of current supplied to the primary s... | 07/04/2006 |
| 7050281 | Device and method for determining rare short circuit A device for easily determining whether a rare short circuit, which results from the generation of heat exceeding a predetermined value, has occurred in a load circuit. The device includes a fuse for detecting a load current that flows through the load circuit and g... | 05/23/2006 |
| 7019583 | Current inrush limiting circuit An inrush circuit for electronic devices is particularly useful for point-of-sale printers. The circuit applies an active feedback-controlled voltage ramp to a bulk capacitor by means of a P-channel field effect transistor that is operated linearly after a controlle... | 03/28/2006 |
| 7015680 | Current-limiting circuitry A field effect transistor (FET) driver circuit includes an error amplifier for providing a FET control signal and a current limiting amplifier for preventing excessive current flow through the FET. The current limiting amplifier generates an overcurrent signal when ... | 03/21/2006 |
| 6992467 | Safety barrier for limiting current and voltage The invention relates to a safety barrier for limiting the current and voltage of an electrical consumer (15) connected downstream thereof. The safety barrier comprises an input terminal (8) and an output terminal (16) and an input and output te... | 01/31/2006 |
| 6984810 | Heater control apparatus and method A heater control is performed without problems when a normal detection of a power source frequency cannot be performed. A heater control apparatus is configured and arranged to be operable by an alternating current having one of a plurality of frequencies. The heate... | 01/10/2006 |
| 6967853 | In-rush current management A duty cycle and period of clock stimulus signals of power conversion device are independently altered to handle in-rush current. In one embodiment, transient power supply turn on current observations coupled with changing of the duty cycle and period of clock stimu... | 11/22/2005 |
| 6968465 | Multiple server in-rush current reduction The specification discloses a system and related method for delaying the powering-on of a server after loss of power. In this way, each server in a rack of servers may have its power restored at staggered times to minimize in-rush current associated with start-up of... | 11/22/2005 |
| 6949912 | Enabling circuit for avoiding negative voltage transients An enabling circuit including a comparison circuit, a switching circuit, and an output decision circuit. The comparison circuit compares a first comparison signal representative of a charge on a capacitor of a DC to DC converter with a second comparison signal repre... | 09/27/2005 |
| 6924993 | Method and apparatus for controlling a stand-alone 4-leg voltage source inverter Methods and apparatus are provided for controlling a stand-alone four-leg three-phase inverter. The inverter three-phase output is converted from AC domain elements to corresponding DC domain elements. The DC domain elements are processed into combined regulating an... | 08/02/2005 |
| 6906497 | Enabling circuit for avoiding negative voltage transients An enabling circuit includes a comparison circuit configured to compare a feedback signal representative of a charge of an energy storage element of a regulating circuit with a reference charge and provide an output in response to the comparison to enable the regula... | 06/14/2005 |
| 6897638 | Stabilized power supply unit having a current limiting function In a stabilized power supply unit having a current limiting function, the unit is designed to have a steep over-current dropping characteristic. This minimizes the over-current region, prevents oscillation during a startup, and limits inrush current during a start u... | 05/24/2005 |
| 6897639 | Circuit arrangement for the power supply of a two-wire sensor A two-wire sensor (6) is attached to one pole of a voltage distribution source (U) by an initial connecting line (V1) in which a current-limiting resistor (R1) is positioned and is attached to the other pole by a second connecting line (V2 | 05/24/2005 |
| 6862201 | Method and circuitry for active inrush current limiter and power factor control A power supply circuit comprising an active power factor correction circuit. The active power factor correction circuit comprises a controller for controlling both the power factor correction and the inrush current control circuit. The inrush control circuit compris... | 03/01/2005 |
| 6850047 | Switching regulator and power supply using the same The power supply PS includes a voltage detecting circuit VD for detecting a voltage level Vs inputted from an external voltage source, a boot strap circuit BS, andET connected in parallel with BS, a smoothing circuit SM connected with the BS output terminal and a re... | 02/01/2005 |
| 6839254 | Power supply with low loss making current limitation A power supply includes a storage capacitor which can be charged with a rectified input current by means of a current-limiting element which is controlled by a drive circuit. The direct-axis component of current and the direct-axis component of voltage on the curren... | 01/04/2005 |
| 6831447 | Surge limiting circuit with optional short circuit detection A method and apparatus for protecting circuit components from inrush current. A field effect transistor (FET) is controlled to provide a source of dynamic impedance, placed in series with a circuit component to be protected. The circuit uses a current limiting circu... | 12/14/2004 |
| 6794619 | Heater energization control circuit, heater energization control method, and image forming apparatus A heater energization control circuit includes a heater, a power source that supplies an alternating current to the heater, a first capacitor that charges and discharges in accordance with a first time constant that is determined by an electrostatic capacity of the ... | 09/21/2004 |
| 6765373 | Control of initial current transients Method and system for providing current transient control for N electrical devices, numbered (N≧2), where each device has an associated current transient I(n) upon power-up or power-down. Q subsets (preferably mutually exclusive) of devices are provided, where the... | 07/20/2004 |
| 6744644 | Soft-start of DC link capacitors for power electronics and drive systems A soft-start system and method for use in the soft-start of DC links for capacitor banks are disclosed. The soft-start system (200) includes a capacitor (230) connected to a first bus (282) of a DC link (280). A resistor (210) is c... | 06/01/2004 |
| 6738272 | Charge pump rush current limiting circuit In a charge pump circuit, a constant current circuit is disposed between an input power supply and an output capacitor, when a power supply is started to turn on, the operation of the charge pump circuit is stopped, and the output capacitor is charged up to a given ... | 05/18/2004 |
| 6737845 | Current inrush limiting and bleed resistor current inhibiting in a switching power converter A current inrush limiting technique for a switching power converter. In one aspect, a switching power converter includes a main power switch and a current sensor. When the input current exceeds a first threshold, the main power switch is opened. When the input curre... | 05/18/2004 |
