| Patent Number |
Title Of Patent |
Date Issued |
| 7598714 |
Amplifier employing interleaved signals for PWM ripple suppression |
October 6, 2009 |
| An amplifier having improved distortion characteristics is set forth. The amplifier includes an interleaved PWM amplifier that generates interleaved PWM pulses in response to a modified input signal and one or more carrier signals. The interleaved PWM pulses of the amplifier are used |
| 7557622 |
Precision triangle waveform generator |
July 7, 2009 |
| A triangle waveform generator is set forth that comprises a capacitive element, a regulator, and a control circuit. The regulator is configured to charge the capacitive element in responsive to a first control signal and to discharge the capacitive element in response to a second control |
| 7554820 |
Series resonant DC-DC converter |
June 30, 2009 |
| A series resonant Dc-DC converter powers an audio amplifier as a load. The series resonant DC-DC converter may include a power input stage, a switching stage, a series resonant stage, a transformer stage and a power output stage. The series resonant DC-DC converter further may include a |
| 7521936 |
Diagnostic system for power converter |
April 21, 2009 |
| A power converter system that includes a diagnostic system is presented. One example of a power converter system is an audio amplifier system, such as a switch mode amplifier. The diagnostic system in the power converter may collect data indicative of signals in the power converter s |
| 7403400 |
Series interleaved boost converter power factor correcting power supply |
July 22, 2008 |
| A power factor correcting power supply includes an input stage power converter and an output stage power converter. The input stage power converter includes a plurality of series connected boost switches and a power factor correction controller. The power factor correction controller |
| 6949915 |
Opposed current converter power factor correcting power supply |
September 27, 2005 |
| A power factor correcting power supply includes an input stage power converter and an output stage power converter. The input stage power converter includes an opposed current converter and a power factor correction controller. The power factor correction controller may direct the op |
| 6927626 |
Thermal protection system for an output stage of an amplifier |
August 9, 2005 |
| Disclosed is a thermal protection circuit for an amplifier generating an amplified AC output signal. The thermal protection circuit may be powered by an amplifier power supply used to power the output stage. The amplifier power supply may be referenced to ground. The thermal protection c |
| 6909321 |
Active isolated-integrator low-pass filter with attenuation poles |
June 21, 2005 |
| The present invention provides an active low-pass filter system including a low-pass filter circuit and at least one frequency-rejecting network coupled to the low-pass filter circuit. The frequency-rejecting network is included in a resistive forward signal flow branch of the low-pass f |
| 6741483 |
Circulating current sensing device for amplifiers |
May 25, 2004 |
| A power amplifier system capable of operation with paralleled power amplifiers includes a circulating current sensing device. The circulating current sensing device decouples the outputs of the paralleled power amplifiers and passively minimizes unbalanced power output of the paralle |
| 6683494 |
Digital signal processor enhanced pulse width modulation amplifier |
January 27, 2004 |
| A pulse width modulator (PWM) audio power amplifier with a switch mode power converter is provided that may adjust the duty of the switch mode power converter based on output current. The PWM audio power amplifier may include a digital signal processor to process an input signal and cont |
| 6608767 |
Apparatus and method for soft switching of parallel switch assemblies |
August 19, 2003 |
| An apparatus and method for reducing power loss due to switching of a switch mode power converter includes a power converter having a plurality of switch assemblies, each connected in parallel through an inductor to a common output node and a diode connected to a second common output nod |
| 6556053 |
Half-bridge gate driver optimized for hard-switching |
April 29, 2003 |
| A half-bridge gate driver circuit including two separate floating high-side driver circuits for operating a switch circuit having a high-side switch and a low-side switch. Each of the driver circuits include input control logic which is referenced to a supply signal with a potential that |
| 6552448 |
Energy management system for series connected amplifiers |
April 22, 2003 |
| An energy management controller (EMC) for use with series connected amplifier modules monitors the rail voltage across an energy storage capacitor which drives the amplifier modules, and compares the rail voltage with a reference voltage. The EMC controls the direction of energy flow |
| 6531862 |
High performance current sensor using low cost current transformer arrays |
March 11, 2003 |
| The present invention provides a current sensor for an electrical device. The sensor includes a housing, a conductor routed through the housing, an array of current transducers coupled to the conductor, and a current level signal generated by the current transducers. The conductor is ada |
| 6504348 |
Remote sensing by high-order filtering |
January 7, 2003 |
| A power converter having a remote sensing system. The power converter includes a high-pass feedback signal, a remote sensing low-pass signal, a constant-sum filter combining the high-pass feedback signal and the remote sensing low-pass signal. The constant-sum filter is at least a second |
| 6426883 |
Apparatus and method for soft switching of parallel switch assemblies |
July 30, 2002 |
| An apparatus and method for reducing power loss due to switching of a switch mode power converter includes a power converter having a plurality of switch assemblies, each connected in parallel through an inductor to a common output node and a diode connected to a second common output nod |
| 6297975 |
Generalized method of paralleling voltage amplifiers |
October 2, 2001 |
| A generalized method for balancing paralleled power converters is disclosed wherein (N) power converters, generally voltage amplifiers, are parallel and have current sensors positioned so as to form a differencing equation for the circulating current, and use that difference current as f |
| 6204657 |
Temperature compensated closed-loop hall effect current transformer |
March 20, 2001 |
| A closed loop Hall effect current transformer in which the Hall effect device has an input resistance which varies with its operating temperature. The Hall effect device is driven by a fixed voltage passing through a current limiting a resistor with variations in voltage across the r |
| 6201395 |
Dual mode gradient coil system |
March 13, 2001 |
| A dual mode gradient coil system in which amplifiers powered by a single signal source are connected by a switch to a plurality of coils. The switch selectively serves to place the coils in series with said amplifiers placed in parallel for a high change in magnetic field per unit di |
| 6178102 |
Regulated DC output power supply for amplifiers |
January 23, 2001 |
| A power supply for supplying a DC voltage from an AC supply voltage provided by an AC voltage source to an amplifier includes a plurality of input lines coupled to the AC voltage source a rectifier coupled to the input lines to provide an unregulated positive DC voltage component and an |
| 5657219 |
Opposed current power converter |
August 12, 1997 |
| A power converter includes a pair of switches, each of the switches being connected between positive and negative constant DC voltage sources and a common output node which is connected to a load. A modulator opens and closes the switches in a sequence in which the electrical current |
| 5513094 |
Switch-mode power supply for bridged linear amplifier |
April 30, 1996 |
| A power converter which includes a bridged power amplifier powered from a sole or single DC input power source through a plurality of parallel connected PWM buck converters. The converters are modulated with reference signals which operate in time alternation such that in any conversion |
| 5438503 |
Slew rate control in a multi-level switch |
August 1, 1995 |
| This invention employs timing circuitry for each voltage source in a multilevel power supply for an amplifier to control the change in voltage outputted from the associated voltage source over time or slew rate when that voltage source is switched on or off preventing large instantaneous |
| 5276603 |
Sixteen level power supply with asynchronous controller |
January 4, 1994 |
| A sixteen level power supply including four voltage sources having stepped voltage values. The voltage sources are controlled by an electronic switch assembly and may be switched into series between the positive and negative output voltage terminals. The switches are controlled by a cont |
| 5182465 |
Amplifier selector for magnetic resonance imaging machine |
January 26, 1993 |
| An amplifier selector for use with a MRI machine having stacked amplifiers. The selector includes a switch assembly carried by each amplifier and controlled by a central controller. Each switch assembly includes a motor for rotating a plurality of switch plates to various predetermined |
| 5045990 |
Sixteen level power supply with asynchronous controller |
September 3, 1991 |
| A sixteen level power supply including four voltage sources having stepped voltage values. The voltage sources are controlled by an electronic switch assembly and may be switched into series between the positive and negative output voltage terminals. The switches are controlled by a cont |
