Motorola Solutions, Inc.

Chen Kok Yeoh

Kow Chee Chong

Muhamad Ridzuan Azizan

Macwien Krishnamurthi

Wai Mun Lee

Mohd Faisal Abdullah

Friedrich J Bollmann

Joo Yih See

Macwien Krishnamurhti

Md Reduan Md Saad

Siew Yin Lee

Yik Chuang Joseph Ting

Chin Seng Tan

Geng Xiang Lee @ Titus Lee

Chin Wun Ng

Abdul Rashid Abdul Halim

Jeevan Kanesalingam

A system comprises a battery and a battery-powered device. Battery contacts and a data interface are therebetween. The battery includes low-power and high-power circuits to output power, from a cell, to the battery-powered device via the contacts. The high-power circuit outputs power higher than the low-power circuit. A switch(es) connects and disconnects the high-power circuit to/from the contacts, the low-power circuit connected to the contacts when the switch disconnects the high-power circuit. A voltage detector: detects a battery-voltage on the contacts and an output voltage on the data interface; when the output voltage is greater than the battery-voltage, controls the switch to connect the high-power circuit to the contacts; and when the output voltage is below the battery-voltage, controls the switch to disconnect the high-power circuit from the contacts. The battery-powered device provides the output voltage on the data interface as powered from the contacts by the battery.

Device, battery and system to control battery power

A battery, method and battery operated portable communication device are provided with protection from excessive current and thermal conditions. A plurality of protection circuits are coupled in series within a common charge/discharge path of the battery. The first protection circuit is configured to block current by opening a switch in response to a voltage drop across the switch and a current sense resistor in the common charge/discharge path. The second protection circuit provides redundancy under conditions where the first switch might fail, where the second switch will block current through the current sense resistor.

Battery protection circuit and method

A battery module includes a first load terminal, a second load terminal, a first charger terminal, a charger enable terminal, and a battery having a first battery terminal coupled to the first load terminal and a second terminal coupled to the second load terminal. A first isolation device is coupled between the first load terminal and the first charger terminal and has an enable terminal coupled to the charger enable terminal. A first protection circuit includes a second isolation device coupled between the second battery terminal and the second load terminal and a first sensing circuit configured to enable the second isolation device responsive to detecting a failure of the first isolation device.

Battery protection circuit with isolation device failure detection

An apparatus and method for providing a selectively reduced voltage to a portable electronic device are disclosed. When a determination is made that an output voltage from a voltage source exceeds a predefined maximum permitted voltage, a plurality of circuitries, including an adaptive active current limiting circuitry, are enabled in order to derive the reduced voltage from the output voltage. The reduced voltage is at least at or below the predefined maximum permitted voltage and is supplied to the portable electronic device by battery circuitry that includes the active current limiting circuitry.

Apparatus and method for adaptive active current limit protection

Battery circuitry forms part of apparatus for connecting a battery power source to a portable electronic device. The battery circuitry is configured to detect a transitioning of an enable signal, caused by actuation of a power switch, from a de-asserted state to an asserted state. In response to detecting the transitioning of the enable signal, the battery circuitry is further configured to open an electrical path within the battery circuitry. The path, when opened, connects the battery power source in a manner that permits powering on of the portable electronic device.

Method and apparatus for connecting a battery power source to a portable electronic device

A method for dynamic limiting of battery voltage includes determining that a voltage delivered by a battery exceeds a predefined maximum safe voltage for operation of a portable electronic device in a hazardous environment and, in response, enabling a voltage restriction circuit in a supply line between the battery and the portable electronic device to reduce the voltage delivered by the battery below the maximum safe voltage, and supplying electrical power to the portable electronic device at the reduced voltage. Enabling the voltage restriction circuit may include deactivating a MOSFET switch that includes a forward biased body diode to allow the body diode to provide a fixed voltage drop. The method also includes determining that the voltage delivered by the battery no longer exceeds the maximum safe voltage and, in response, disabling the first voltage restriction circuit by activating the MOSFET, thus allowing the body diode to be bypassed.

Dynamic battery voltage restriction for hazardous environments

A device, battery and method for spark detection based on transient currents is provided. The battery includes: a cell; an interface; a first protection circuit and a second protection circuit. The first protection circuit comprises a first switch between the cell and the interface. The second protection circuit comprises a second switch between the cell and the interface. The first protection circuit is configured to: measure a load current on the cell; and open the first switch according to a first delay time based on the measurement of the load current. The second protection circuit is configured to: measure a transient current on the cell above the load current; and open the second switch according to a second delay time, lower than the first delay time, based on the measurement of the transient current.

Device, battery and method for spark detection based on transient currents

An apparatus and method for controlling an audio power circuit. The audio power circuit includes an audio amplifier having a power input and a speaker connected to the audio amplifier. The audio power circuit also includes a control circuit configured to be connected to a battery and the power input and to control a supply of power to the power input. The audio power circuit further includes a thermal protection circuit connected between the audio amplifier and the speaker, the thermal protection circuit configured to generate a thermal protection signal and provide the same to the control circuit, wherein the control circuit is further configured to control the supply of power based on the thermal protection signal.

Audio power circuit and method

An intrinsically safe audio power circuit includes redundant electronic fuses disposed between the power input of an audio power amplifier and the battery source of the portable two-way radio device. The electronic fuse circuits are connected in series with each other, and each electronic fuse circuit includes a series switch transistor that can shut off the flow of current between the battery and the audio power amplifier. Each electronic fuse circuit also includes a current sense portion, and when the current through the electronic fuse circuits reaches a current threshold, it will shut off its series switch transistor using an active bias circuit in order to ensure sufficiently rapid shut off.

Intrinsically safe audio power current circuit and device using same

Communication equipment includes a circuit generating an RF input signal; a PA receiving a supply voltage, receiving the RF input signal, and providing an amplified version of the RF input signal as an output signal that is associated with an output power of the communication equipment; and an output circuit that includes an antenna for transmitting the output signal. The communication equipment also includes: a voltage detector circuit including sensing circuitry for sensing the supply voltage and a comparator for comparing the supply voltage to a first voltage threshold and generating a control signal when the supply voltage exceeds the first voltage threshold; and a disabling circuit coupled to the voltage detection circuit for disabling a portion of the communication equipment in response to the control signal to maintain output power of the communication equipment below a maximum output power level.

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Bukit Mertajam, Malaysia

Chen Kok Yeoh