Utc Fire & Security Americas Corporation, Inc.

General Electric Company

Ge Energy Power Conversion Technology Gmbh

Laigui Qin

Donald Edward Becker

Baohua Shu

Wei Zhu Chen

William H Edwards

Rongbin Qiu

Zhenhua Huang

Xiao Luo

Tao Wu

Stefan Schroeder

Jie Shen

Ying Zhang

Fan Zhang

Yingqi Zhang

Kunlun Chen

Xin Hao

Richard Philip Tucker

An exemplary power conversion system includes a power conversion device and a control system. The power conversion device converts electrical power from one form to another. The power conversion device includes at least one switching element capable of being turned off to block an electrical current flowing through the at least one switching element. The control system is electrically coupled to the power conversion device for monitoring an electrical current flowing through the at least one switching element and for monitoring at least one parameter in association with the operation of the power conversion system. The control system further generates an over-current threshold value that is variable with respect to at least one monitored parameter.

System and method for over-current protection

A circuit includes a switching module, a control module, and a driving module. The driving module is electrically coupled between the control module and the switching module for generating a driving signal. The driving module includes a normal driving unit and a fault protection unit. The normal driving unit is for turning on and off the switching module according to a first command signal from the control module. The fault protection unit is for lowering the driving signal from a driving value to a protection value according to a second command signal from the control module during a fault protection period after the control module receives a fault signal.

Power conversion circuit having fault protection and voltage balance functions

A system and method for operating a security system include a device control module configured for electronic communication with a plurality of devices and a user interface coupled in electronic communication with the device control module. The user interface includes a voice memory and a first speaker. The user interface is configured to receive a first system event from the device control module identifying a first condition detected by the security system. The user interface is further configured to retrieve a voice message from the voice memory corresponding to the first system event and transmit the voice message via the first speaker.

System and method for operating a security system

A controller for outputting audio having a predetermined output sample rate. The controller is programmed to receive an audio signal having a first sample rate, identify the first sample rate of the audio signal, select a converter based on the identification of the first sample rate, and convert the sample rate of the received audio signal to the predetermined output sample rate.

Method and system for efficient optimization of audio sampling rate conversion

Property monitoring system and method of operating. Two signal lines are used to couple a master controller in series with a plurality of indicators. Each indicator has a visual display. Each visual display has a plurality of LEDs, or other type of lighting device. The master controller is configured to generate a multi-bit digital command message to be transmitted serially to the plurality of indicators over the second signal line upon receipt of an alarm condition message. Each command message has a predetermined time delay for activating each of the indicators, or a component thereof, so that all indicators activate in unison.

System and method of controlling indicators of a property monitoring system

A differential transformer-free hybrid circuit includes a first amplifier configured to receive a first signal from a transmitter and output the first signal to a telephone loop, and a second amplifier configured to receive a second signal from the telephone loop and output the second signal to a receiver. Further, the differential transformer-free hybrid circuit also includes at least one balanced network element and a transformer-less interface configured to couple the first amplifier and the second amplifier to the telephone loop, wherein the transformer-less interface includes at least one current blocking device.

Method, system, and apparatus for a differential transformer-free hybrid circuit

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