Schneider Electric It Corporation

Osram Sylvania Inc.

Universal Lighting Technologies, Inc.

Qinghong Yu

Joseph Parisella

John Jay Dernovsek

Peter W Shackle

Christopher Radzinski

Kaushal J Patel

John G Konopka

Grigoriy A Trestman

Adam Daniel Sanner

Jing Huang

Jeffrey M August

Brian Peter McKenna

James Edward Briggs

Steven Allen Diggins

Jeffrey Steven Young

Marcel Bertrand Grenier

James Walter Frey

Barrie Drew

Christopher Radzinkski

Devin Patrick Auclair

Daniel Santinho Lopes

Camilo Mejia

Kenneth J Steeves

Kaiyu Wang

Joseph L Parisella

Examples of the disclosure include a power system including a first device having a first converter and a first DC bus, a second device having a second converter and a second DC bus, an output coupled to a load, and at least one controller configured to control, in a mains mode, the first device to be in an active state, control the first converter to maintain the first DC bus at an active voltage in the active state of the first device, control, in the mains mode, the second device to be in a standby state, control the second converter to maintain the second DC bus at a standby voltage higher than the active voltage in the standby state of the second device, and control the second converter to transition to the active state responsive to initiating a transition from the mains mode to a backup mode.

Systems and methods for controlling power devices

Examples of the disclosure include a power system comprising a power-system output configured to be coupled to, and provide an output AC waveform to, one or more loads, a positive DC bus, a negative DC bus, an inverter coupled to the positive DC bus and the negative DC bus, the inverter including an inverter output coupled to the power-system output, and a DC/DC converter coupled between the inverter output and at least one of the positive DC bus or the negative DC bus.

Systems and methods for inverter and DC/DC converter operation

Uninterruptible power supplies, power modules, and non-transitory computer readable mediums storing instructions for operating such power modules, the power modules comprising an input configured to receive AC power from an AC power source, an output configured to provide AC output power to a load, and a plurality of power modules coupled in parallel between the input and the output, each power module of the plurality of power modules configured to provide at least a portion of the AC output power to the output. Each power module of the plurality of power modules comprises a current compensator stage configured to generate a current error signal based on output current of a corresponding power module and a gain adjustment stage configured to adjust the current error signal based on a measurement of the output current and a desired output current of the corresponding power module.

Gain adjustment stage for controlling modular ups systems

A power supply including an input configured to receive input power, an output configured to provide output power to a load, at least one relay, a crowbar circuit configured to selectively divert the input power away from the load, and a controller configured to detect a high-voltage condition at the input, activate, in response to detecting the high-voltage condition at the input, the crowbar circuit to divert the input power away from the load, output, in response to detecting the high-voltage condition at the input, a signal to operate the at least one relay to transition from a first state to a second state, and deactivate the crowbar circuit in response to a determination that the at least one relay has transitioned to the second state.

Instantaneous line swell protection for UPS

According to one aspect, embodiments of the invention provide a DC-DC power converter system comprising a positive bus interface, a negative bus interface, a positive battery interface, a negative battery interface, a first converter segment coupled to the positive bus interface and the negative bus interface, a transformer coupled to the first converter segment, a second converter segment coupled to the transformer, the positive battery interface, and the negative battery interface, a bus balancer circuit coupled to the transformer, and a controller configured to identify an imbalance between a positive voltage level on a positive DC bus and a negative voltage level on a negative DC bus, and in response to identifying the imbalance, operating the bus balancer circuit to convert the first converter segment, the transformer, and the second converter segment into an inverted buck-boost converter configured to transfer energy between the positive bus interface and the negative bus interface.

DC-DC power converter with four way power conversion

A UPS comprising an input, an output, a battery circuit, a PFC stage, a switch configured to selectively couple an interface of the PFC stage to the input in an online mode and to the battery circuit in a backup mode, a positive DC bus, a negative DC bus, and a controller configured to operate, in the online mode, the PFC stage to provide DC power, derived from the input AC power, to the DC busses, to operate, in the backup mode, the PFC stage to provide DC power, derived from the backup DC power, to the DC busses, to operate, in a first stage of the backup mode, the battery circuit to couple a positive terminal of a DC source to the interface, and to operate, in a second stage of the backup mode, the battery circuit to couple a negative terminal of the DC source to the interface.

Flying battery with AC switch PFC front end for ups

According to one aspect, an uninterruptable power supply (UPS) is provided. The UPS includes a first input constructed to receive input power from a first power source, a second input constructed to receive input power from a second power source, an output constructed to provide output alternating current (AC) power derived from at least one of the first power source and the second power source, a bypass switch having an on state and an off state coupled between the first input and the output, an inverter coupled between the second input and the output and constructed to generate the output AC power. The UPS being constructed to quickly transition from a first power delivery mode that provides output power derived from the first power source to a second power delivery mode that provides output power derived from the second power source.

Systems and methods for quick power delivery mode changes

According to at least one aspect, embodiments herein provide a traffic light power management system comprising a power source, a first output, a service bypass unit and a power management unit. The service bypass unit is configured to receive AC power from the power source, convert the AC power to a first DC power in a first mode of operation, provide the first DC power to the first output in the first mode of operation, and provide the AC power to a power management unit in a second mode of operation. The power management unit is coupled to the service bypass unit, and is configured to receive the AC power from the service bypass unit in the second mode of operation, convert the AC power to a second DC power in the second mode of operation, and provide the DC power to the first output in the second mode of operation.

Power management unit for intelligent traffic system applications

According to at least one aspect, embodiments herein provide a method for operating a battery charging system, the method comprising receiving, by a first rectifier, a first AC voltage, receiving, by a second rectifier, a second AC voltage, converting, by the first rectifier, the first AC voltage to a first DC voltage, converting, by the second rectifier, the second AC voltage to a second DC voltage, biasing, by the second rectifier, the first rectifier with the second DC voltage, biasing, by the second rectifier, a battery charger with the second DC voltage, providing, by the first rectifier, a biased voltage to the battery charger, and providing, by the battery charger, a second power to a battery.

Stack DC power supply battery charger

A circuit () for powering a halogen lamp () comprises an inverter () and an output circuit (). During operation, the inverter () and output circuit () provide a magnitude-limited current to the halogen lamp such that the lamp power during an initial period is substantially less than the lamp power during a steady-state operating period. Preferably, output circuit () is a non-isolated circuit that includes a current-limiting inductance, and inverter () includes a frequency control circuit (R,C,C,Q,R,R,C) for operating the inverter at a higher frequency during the initial period so as to reduce stress upon the lamp filament and preserve the operating life of the lamp. The circuit () is especially suitable for powering low voltage halogen lamps.

Power supply for halogen lamp having an inverter and output circuit

A ballast () for powering at least one gas discharge lamp () having heatable filaments () includes an inverter (), a resonant output circuit () coupled between inverter () and lamp (), and a filament heating and ignition control circuit () coupled to inverter () and resonant output circuit () having a first resonant frequency and a second resonant frequency, wherein the first resonant frequency is substantially greater than the second resonant frequency. Filament heating and ignition control circuit () controls inverter () and resonant output circuit () during a preheat phase and during a normal operating phase. During the preheat phase, resonant output circuit () has an effective resonant capacitance corresponding to the first resonant frequency, and provides a first level of heating to the lamp filaments (). During the normal operating phase, resonant output circuit () has an effective resonant capacitance corresponding to the second resonant frequency, and provides a second level of heating to the lamp filaments () that is negligible in comparison with the first level of heating. Control circuit () monitors a voltage within resonant output circuit () in order to compensate for any variation in the parameters of resonant output circuit () and to ensure that an appropriate level of preheating is provided to lamp filaments ().

Ballast with filament heating and ignition control

A ballast (') for powering at least one gas discharge lamp () comprises an inverter () and an output circuit (&#x2032;). Output circuit (&#x2032;) includes an output transformer () and output connections () for connection to one or more lamps (). A secondary winding () of output transformer () includes a tap connection (). A voltage-limiting impedance () is coupled between the tap connection () and earth ground (). Tap connection () is positioned, and voltage-limiting impedance () is sized, so that the voltage between earth ground () and any of the output connections () remains below applicable limits as dictated by regulatory and/or safety requirements.

Ballast with socket-to-fixture voltage limiting

A ballast () for powering a lamp load () comprising one or more gas discharge lamps () includes an inverter (), a resonant output circuit (), and a control circuit (). During operation of ballast (), control circuit () monitors at least one voltage within one or more series resonant circuits of output circuit (). When the monitored voltage reaches a specified level, control circuit () directs inverter () to maintain its operating frequency at a present value for a predetermined period of time, so as to allow output circuit () to provide a suitably high voltage for igniting the lamp(s). If the lamp(s) ignite within the predetermined period of time, control circuit () ceases controlling inverter () to maintain its operating frequency at the present value, so as to allow for normal operation of the lamp(s). Control circuit () also provides a lamp stabilization function, in which the inverter operating frequency is prevented from falling below a specified minimum value, and a protective function, in which inverter () is deactivated in response to failure of the lamp(s) to ignite within the predetermined period of time.

Ballast with ignition voltage control

A ballast () for powering one or more gas discharge lamps () comprises an inverter (), an output circuit (), and an arc protection circuit (). Arc protection circuit () monitors an electrical signal within the output circuit (). When an arcing condition occurs at the ballast output connections (), the electrical signal includes a high frequency component having a fundamental frequency that is much greater than the normal operating frequency of the inverter (). In response to the high frequency component exceeding a predetermined threshold, arc protection circuit () disables the inverter () for a predetermined shutdown period. Arc protection circuit () also provides a restart function for periodically attempting to ignite and operate the lamps. Arc protection circuit () is preferably realized using a microcontroller integrated circuit () with associated discrete circuitry, and is especially well-suited for use in ballasts for powering multiple lamps via a current-fed self-oscillating inverter and an isolated parallel resonant output circuit.

Ballast with arc protection circuit

A ballast () for powering at least one gas discharge lamp () in a program start mode comprises an inverter (), a resonant output circuit (), and a control circuit (). During operation of ballast (), control circuit () monitors a voltage within resonant output circuit (). When the monitored voltage reaches a first specified level that is indicative of sufficient filament preheating, control circuit () maintains the inverter operating frequency at a first present value for a preheating period so as to provide preheating of lamp filaments (). Following completion of the preheating period, control circuit () allows the inverter operating frequency to decrease. When the monitored voltage reaches a second specified level that is indicative of sufficient ignition voltage, control circuit () maintains the inverter operating frequency at a second present value for an ignition period so as to provide ignition of lamp ().

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Salem, MA, United States of America

Qinghong Yu