摘要:
A battery pack (110) having a plurality of cells (103, 105) utilizes a pull up resistor (116) multiplexed between separate voltage supply sources (120, 122) and a single battery contact (106) to monitor individual cell temperatures. A plurality of thermistors (102, 104) are coupled in series between ground potential (108) and the single battery pack contact (106), each thermistor being coupled to one cell of the pack. Individual voltage divider circuits are formed for each thermistor (102, 104) as the pull up resistor (116) is multiplexed between the voltage supply sources (120, 122).
摘要:
A communication device (102) has a loudspeaker (212) that includes a loudspeaker coil. The loudspeaker is used for playing audio signals and for detecting metal in the vicinity of the loudspeaker. To detect metal the communication device includes a pulse generation circuit (216) for generating pulses that are applied to the loudspeaker, and a pulse measurement circuit (222) for measuring response pulses. If the response pulses indicate metal is in proximity to the loudspeaker, an alert is generated to inform the user of the communication device.
摘要:
The invention concerns a method (300) and system (100) for operating a multiple charger. The method can include—in a multiple charger (110) having at least a first switch (134) and a second switch (122) for respectively controlling the flow of current to a first battery (116) and a second battery (118)—charging (312) the first battery by maintaining the first switch in a saturated state and charging (314) the second battery by maintaining the second switch in a saturated state. The first switch and the second switch can be simultaneously maintained (314) in the saturated state at least until the first battery reaches a predetermined charging threshold (412, 414).
摘要:
A wireless communication device (50) can include a radio frequency transceiver (52), an audio drive circuit (58) coupled to the transceiver, a speaker (10) having a voice coil (16) coupled to the audio drive circuit, and an antenna feed or radiating circuit (20) such as an RFID or NFID circuit coupled to the voice coil for at least radiating or receiving an electromagnetic signal via the voice coil. Such radiating circuits can be coupled to the voice coil using a band pass circuit designed to substantially prevent a radiating signal from the radiating circuit from interfering with audio drive circuit driving the speaker. The wireless communication device can further include an antenna (54) coupled to the radio frequency transceiver. Note, this arrangement can be designed to avoid problems involving electrostatic discharge sensitivity, electromagnetic interference coupling between the antenna and the voice coil, total radiated power, and specific absorption rate.
摘要:
The invention concerns a method (200) of generating an array (100, 300, 400) having a reduced number of input/outputs (114, 314, 414). The method includes the steps of, for each array row input/output, grouping (212) at least one set of rows (124, 324, 424) in which the set of rows is coupled to the array row input/output and, for each combination of the array row input/outputs, selectively coupling (216) non-set rows (326, 426) to the array row input/outputs that comprise the combination. At least a portion of a number of rows (110, 310, 410) for the array is equal to the number of rows in each set of rows multiplied by the number of array row input/outputs plus the number of non-set rows coupled to the array row input/output combinations.
摘要:
A battery charging system (250) for use with an induction charger (210). The battery charging system can include a secondary coil (252) having a plurality of turns for receiving magnetic flux produced by a primary coil (220) of the induction charger, and a control circuit (254) for controlling a number of turns of the secondary coil that are used in generating an output voltage for charging a cell (264). For example, the secondary coil can include a plurality of taps (291, 292, 293, 294), each of the taps providing an electrical connection to the coil at a different point, and thus providing a variety of selectable output voltages.
摘要:
A wireless device (100) includes an electrical circuit arrangement (200) for deterring access to an electrical signal having a predictable electrical pattern. The circuit arrangement (200) includes a processor (206) for processing instructions and a controller (210) communicatively coupled to the processor (206) and able to send at least one signal along each of a plurality of signal lines from within the circuit (200). The processor (206) causes the controller (210) to sporadically introduce a signal onto each of the plurality of signal lines, where the signal is unrelated to any communication function of the wireless device and is present solely for the purpose of making the signal line unpredictable.
摘要:
The invention concerns a method (300) and system (100) for obtaining ambient temperatures. The method can include the steps of coupling (312) an accessory (112) having a first temperature monitor (170) to a portable electronic device (110), operating (314) a power source (114) of the portable electronic device and monitoring (318) an ambient temperature with the first temperature monitor and a temperature of the power source. The method can also include the steps of discontinuing (322) operation of the power source if the temperature of the power source reaches a predetermined threshold and reinitiating (328) the operation of the power source if it is determined (324) that the ambient temperature was within a predetermined range of the predetermined threshold and that the ambient temperature is outside the predetermined range.
摘要:
A portable electronic device and a method to protect the portable electronic device from a battery bounce are provided. The portable electronic device (100) can comprise a free-fall condition sensor (105) enabled to detect a pre-battery bounce condition in the portable electronic device and a processor (110) coupled to the free-fall condition sensor (105). The processor (110), in response to a detection of the pre-battery bounce condition by the free-fall condition sensor (105), can be programmed to place the portable electronic device (100) in a pre-battery bounce setting. The method can include detecting a pre-battery bounce condition in the portable electronic device (405) and in response to the detection of the pre-battery bounce condition (405), placing the portable electronic device in a pre-battery bounce setting (410).
摘要:
A charging system (108) supplies a source voltage (Vco, FIG. 5) and a source current (Ico, FIG. 5) to a plurality of battery cells (110). The charging system operates according to a method (200) including the steps of determining (202) a capacity for each of the plurality of battery cells (120 and 130), determining (204) a desired cutoff current (Ico1, FIG. 5) for a select one of the plurality of battery cells (120) having the smallest capacity, determining (206) an optimal source cutoff current according to the capacity of the select one of the plurality of battery cells, adjusting (208) the source current according to the optimal source cutoff current, and upon the source current reaching the optimal source cutoff current, switching out the select one of the plurality of battery cells to allow continued charging of another cell until it is fully charged.