Patent application number | Description | Published |
20120249381 | RADIO FREQUENCY PRINTED CIRCUIT BOARD - A radio frequency(RF) printed circuit board (PCB) includes an RF circuit for generating high frequency signals. The RF PCB is connected to an EMC measuring device when measuring the EMC thereof. The measuring device includes a probe pin and a shielding barrel surrounding the probe pin. The shielding barrel includes an end surface at a distal end thereof. The RF PCB further includes a test node connected to the RF circuit and a ground node surrounding the test node. The test node contacts the probe pin and outputs the high frequency signals when measuring the EMC of the RF PCB. The ground node corresponds to the end surface and contacts the end surface while the probe pin contacts the test node. | 10-04-2012 |
20130027836 | STATIC DISCHARGE ISOLATION DEVICE AND COMPUTER CASE ASSEMBLY WITH SAME - Provided is a static discharge isolation device for mounting on a case of a computer. The case includes a sidewall with an array of exposed interfaces. The static discharge isolation device composed of a dielectric. The static discharge isolation device includes a main body. The main body defines a number of cavities. The number, size, shape, and arrangement of the cavities are such to ensure each interface of the computer being closely surrounded by a corresponding cavity. | 01-31-2013 |
20130052869 | USB CONNECTOR - A universal serial bus (USB) connector includes a housing and a main body received in the housing. The main body includes an insulator, a number of conductive terminals, a number of conductive pieces, and an anti-electromagnetic radiation (EMR) member. The conductive terminals, the conductive pieces, and the anti-EMR member are arranged in the insulator. Each conductive piece connects a corresponding one of the conductive terminals to the anti-EMR member. | 02-28-2013 |
20130068520 | ELECTROMAGNETIC SHIELDING DEVICE AND ELECTRONIC APPARATUS - An electromagnetic shielding device for shielding electromagnetic energy generated by an electronic apparatus. The electromagnetic shielding device includes a base board and a number of protrusions formed on the base board. The length of each protrusion along a direction perpendicular to the base board is adjustable. The amount of electromagnetic energy can be absorbed by the electromagnetic shielding device is adjusted according to the length of the protrusion. | 03-21-2013 |
20130084742 | VIDEO GRAPHICS ARRAY CONNECTOR - An exemplary VGA connector includes a number of power pins, a number of signal pins, a number of ground pins, a number of EMI suppression members, and a cable. The power pins are to receive power. The signal pins are to transmit signals. The EMI suppression members are configured to suppress electromagnetic interference. The cable includes a plurality of wires. Each wire corresponds to one pin. Each EMI suppression member is electrically connected between one of the plurality of signal pins and one of the plurality of wires corresponding to the one of the plurality of signal pins. | 04-04-2013 |
20130105654 | FIXING APPARATUS FOR WAVEGUIDE PLATE | 05-02-2013 |
20130141887 | CHASSIS FOR ELECTRONIC DEVICE - A chassis for an electronic device includes a main housing and a removable cover. The main housing includes a base plate and two opposite side plates integrally formed together. The removable cover includes a main portion and two opposite side portions. The side portions are latched on the side plates. A space is defined between each side portion of the cover and each side plates of the main housing. A waveguide is formed between each side portion and each side plate to attenuate electromagnetic radiation in the space. | 06-06-2013 |
20130164978 | CONNECTOR WITH DECREASED ELECTROMAGNETIC RADIATION EMMISSION - A connector includes a connector receptacle and a cable. The connector receptacle includes an insulating body, a metallic box and a magnetic ring. The metallic box is connected to the insulating body and defines a closed receiving cavity. The cable includes a cable head. The cable head is received in the receiving cavity, and extends through the magnetic ring. | 06-27-2013 |
20130337686 | MEMORY CARD MODULE WITH ELECTROMAGNETIC RADIATION SHIELD - A memory card module includes a memory card, a socket including a connecting portion and a main body protruding from the connecting portion, two locking members, and a shielding member made of electromagnetic shielding material. The shielding member covers the memory card and the main body. The locking members are pivotably attached to opposite sides of the main body respectively. Each locking member includes a locking portion. The shielding member includes a top plate, two end plates extending down from opposite ends of the top plate, and two side plates extending down from opposite sides of the top plate. A number of vents are defined in each end plate. A block protrudes from each side plate. The locking portion of each locking member abuts against the block of the corresponding side plate, to mount the shielding member to the socket. | 12-19-2013 |
20140097919 | WAVEGUIDE MEMBER - A waveguide member assembly includes a side plate and a waveguide member. The side plate defines an opening. The waveguide member includes a main body molded integrally by plastic. The main body includes a core portion and a mounting plate extending out from edges of a side of the core portion. The core portion includes a number of waveguide tubes aligning with the opening. A metal layer is coated on an outer side of the main body and inner sidewalls of the waveguide tubes. The mounting plate is fastened to the side plate. | 04-10-2014 |
Patent application number | Description | Published |
20090009134 | METHOD AND DEVICE FOR MEASURING INTERNAL RESISTANCE OF BATTERY - A device for measuring an internal resistance of a battery includes a charging unit, a switch, a measuring unit, and a calculating unit. The charging unit is used for respectively charging the battery through a first resistor (R | 01-08-2009 |
20090027039 | POWER SUPPLY - A power supply is for receiving an AC voltage and outputting a DC voltage and an output current to an electronic device. The power supply includes an input module, an output module, a measuring interface, a measuring interface, and a switch module. The input module is for receiving the AC voltage. The output module is for outputting the DC voltage and the output current to the electronic device. The measuring interface is for electrically contacting with a part of the electronic device. The measuring module is for measuring the DC voltage, the output current, and a voltage and a current of the part of the electronic device. The switch module is for choosing one of the output module and the measuring interface to be electrically connected to the measuring module. | 01-29-2009 |
20120217984 | RESISTANCE-MEASURING CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - A resistance-measuring circuit includes a controller for outputting a PWM signal and further for adjusting the duty cycle of the PWM signal, and a sampling circuit for processing the PWM signal and transmitting the processed PWM signal to the sensor. The sampling circuit samples the signal outputted from the sensor to generate a sampled signal with the voltage thereof changing according to any change in the duty cycle of the PWM signal, and further transmits the sampled signal to the controller. The controller obtains the real-time duty cycle of the PWM signal when the voltage of the sampled signal reaches a threshold voltage, and further calculates the exact resistance of the sensor according to the obtained real-time duty cycle of the PWM signal and the threshold voltage. An electronic device with the resistance-measuring circuit is also provided. | 08-30-2012 |
20120250891 | PERSONAL LISTENING DEVICE WITH SELF-ADJUSTING SOUND VOLUME - An exemplary personal listening device includes thermo-sensitive elements in its transducers. Each thermo-sensitive element senses temperature change of a corresponding transducer and changes a current flowing through the transducer according to temperature change of the transducer, to reflect the amount of time for which the personal listening device has been working. | 10-04-2012 |
20120253734 | ASSAY DEVICE AND METHOD AND ELECTRONIC DEVICE USING SAME - An assay device capable of assaying purity of a substance in an object includes a memory, an emitter, a receiver, a processing unit, and a display device. The memory stores names and standard densities of a number of substances. The emitter emits rays at the object. The receiver receives the rays reflected by the object. The processing unit calculates density of the object according to intensity of the emitted rays and intensity of the reflected rays. The processing unit further calculates purity of a selected substance in the object according to the density of the object and standard density of the selected substance stored in the memory, and outputs the calculated purity to the display device. | 10-04-2012 |
20130026939 | PULSE WIDTH MODULATION CIRCUIT AND ILLUMINATION APPARATUS - An illumination apparatus includes a power supply, a pulse width modulation (PWM) circuit, a switching unit, and an illuminating unit. The power supply supplies a supply voltage to the PWM circuit and the illuminating unit. The PWM circuit outputs a first level voltage by being fully charged by the voltage of the power supply and outputs a second level voltage by being fully discharged. The switching unit is turned off according to the first level voltage and controls the illuminating unit to stop emitting light. The switching unit is turned on according to the second level voltage and controls the illuminating unit to emit light. | 01-31-2013 |
20130028395 | TELEPHONE SWITCHBOARD AND ELECTRONIC DEVICE FOR PROVIDING POWER TO LOAD HAVING DIFFERENT RESISTANCE VALUES AT DIFFERENT OPERATION MODES - A telephone switchboard provides various operating voltages to a telephone in different operation modes. The telephone switchboard includes a control unit, an output control circuit and a voltage converter. The control unit detects the operation mode of a telephone and generates control signals to the output control unit. The output control unit controls direction of current flowing through the telephone according to the control signal, and generates a feedback signal according to any change in the operation mode of the telephone. The voltage converter receives the feedback signal and converts the received power to a suitable output operation voltage according to the feedback signal. The telephone switchboard is capable of providing various operation voltages to the telephone in the different operation modes. | 01-31-2013 |
20130155563 | CURRENT LEAKAGE PROTECTION CIRCUIT, POWER SOCKET AND ELECTRONIC DEVICE USING SAME - A current leakage protection circuit includes a first input terminal, a second input terminal for receiving a power voltage and a current leakage detection terminal configured for detecting a current leakage from an electronic device. A control circuit of the current leakage protection circuit is configured for providing a control signal to control a first switch circuit to switch off a first connection between the first input terminal and a first output terminal and to control a second switch circuit to switch off a second connection between the second input terminal and a second output terminal when the current leakage detection terminal detects current leakage of the electronic device. | 06-20-2013 |
20130260748 | APPARATUS AND METHOD FOR SUBSCRIBING TO INTERNATIONAL ROAMING PLAN FOR COMMUNICATION DEVICE - A computerized method for subscribing an international roaming plan for a communication device, the communication device includes an electronic map. At least one border checkpoint of a predetermined country can be determined on the electronic map. A distance between a current location of the communication device and the location of the at least one border checkpoint is calculated. When the calculated distance is less than a predetermined distance and the current location of the communication device is within the home country, a user may be prompted to select whether to subscribe to an international roaming plan for a particular period of time. A preset message is sent to a predetermined service terminal provided by a telecommunication company to subscribe to the international roaming plan for the communication device when the user makes a selection to subscribe to the international roaming plan for the communication device. | 10-03-2013 |
20130294205 | ELECTRONIC DEVICE AND METHOD FOR TRIGGERING FUNCTION OF ELECTRONIC DEVICE - An electronic device includes a sound collecting unit and a processor. The processor determine whether continuous sound signals collected by the sound collecting unit includes a first alternating portion, a direct portion, and a second alternating portion in sequence. The processor further determines whether a first duration of the direction signals portion falls within a first preset time range, and determines whether a second duration of each of the first alternating portion and the second alternating portion falls within a second preset time range. The processor then triggers a function of the electronic device when the first duration falls within the first preset time range, and the second duration falls within the second preset time range. A related method is also disclosed. | 11-07-2013 |
20130305355 | DATA SECRECY METHOD AND ELECTRONIC DEVICE USING DATA SECRECY METHOD - A data secrecy system of an electronic device detects whether a screen unlocking interface of the electronic device is activated. The data secrecy system controls the recorder to record a phrase said by a user after the user is invited to speak. And then the data secrecy system extracts characteristics of the recorded phrase. The data secrecy system determines a privilege level for the user to access all or a part of functions of the electronic device according to the characteristics of the phrase, and controls the electronic device to work according to the determined privilege level of the user. | 11-14-2013 |
20130307572 | BATTERY SIMULATION CIRCUIT - A battery simulation circuit simulates a rechargeable battery. The battery simulation circuit includes an integrated amplifier, a voltage adjustment unit, a current limitation unit, and a feedback unit. The voltage adjustment unit provides a reference voltage for the integrated amplifier; the current limitation unit provides a reference current for the integrated amplifier and the feedback unit provides a negative feedback signal for the integrated amplifier to control the integrated amplifier working in a linear state. The integrated amplifier outputs an output signal according to the reference voltage and the reference current; the battery simulation circuit supplies power for an electronic device. When the output terminal is connected to a DC power source and a voltage of the DC power source is greater than the output voltage of the output terminal, the battery simulation circuit simulates a battery being recharged by the DC power source via the output terminal. | 11-21-2013 |
20130308240 | ELECTRONIC LOAD FOR TESTING VOLTAGE STABILITY - An electronic load for testing stability of a power voltage of a power source under test (PSUT) includes a voltage supply device, a field effect transistor (FET), an amplification circuit, and a current sampling resistor. The amplification circuit includes a first input, a second input, and an output. The voltage supply device is connected to the first input. The second input is connected to a source electrode of the FET. The output is connected to a gate electrode of the FET. A drain electrode of the FET is connected to the PSUT. One end of the current sampling resistor is grounded, and the other end of the current sampling resistor is connected to the source electrode of the FET and the second input. The voltage supply device outputs a control voltage. The amplification circuit amplifies the control voltage and drives the FET using the amplified control voltage. | 11-21-2013 |
20140045545 | ANTI-EAVESDROPPING COMMUNICATION SYSTEM AND METHOD - An anti-eavesdropping communication system and method are adapted to be applied in a mobile phone. The mobile phone defines a normal call mode and an anti-eavesdropping call mode. When a user of the mobile phone has a phone conversation using an earphone in the anti-eavesdropping call mode, the system plays a preset audio file which is a recording of the voice of the user saying unimportant things. From the position of a bystander, the recording of the voice of the user interferes with the clarity of what the user is actually saying, and prevents people beside the user overhearing or eavesdropping on the actual conversation which is taking place. | 02-13-2014 |
Patent application number | Description | Published |
20090009135 | CHARGE PROTECTION CIRCUIT WITH TIMING FUNCTION - A charge protection circuit with a timing function is disclosed. The circuit includes a charge protection module constituting of a second switch, a second capacitor and a control integrated circuit (IC). The second switch Q | 01-08-2009 |
20090027359 | STYLUS WITH SUCTION CUP - A stylus includes a suction cup configured for being attached to a user' finger and a touch body mounted on the suction cup. In using this kind of stylus, a user can accomplish an input operation in a portable electronic device by using one hand to hold the portable electronic device and using a finger of the same hand to manipulate the stylus. | 01-29-2009 |
20100308020 | ELECTRICAL SOLDERING IRON - An electrical soldering iron is provided. The soldering iron comprises a heating element, a constant temperature heating circuit, a motion sensor, and a processor. The constant temperature heating circuit is configured for heating the heating element. The motion sensor is configured for detecting motion of the electrical soldering iron. The processor is configured for determining motion state of the electrical soldering iron according to signals from the motion sensor and directing the constant temperature heating circuit to bring the heating element to a temperature of a predetermined value corresponding to the motion state. | 12-09-2010 |
20120161926 | DISPLAY APPARATUS WITH TOUCH-SENSITIVE SCREEN LOCK/UNLOCK FUNCTION AND METHOD THEREOF - A display apparatus and a method for locking and unlocking a touch-sensitive screen are provided. A user interface is provided on the display apparatus for a user to set at least two types of passwords. At least two types of passwords displayed on the user interface are stored when input of the at least two types of passwords ends. The touch-sensitive screen is locked according to any one of the at least two stored types of passwords. The touch-sensitive screen is unlocked if an input password matches any one of the at least two types of passwords. | 06-28-2012 |
20120169502 | ELECTRONIC BABY MONITORING DEVICE - An electronic baby monitoring device includes a sensor monitor and a motion sensor. The motion sensor communicates with the sensor monitor and includes an accelerometer, a control module, an emitting module, a power source, and a switch. The accelerometer senses the acceleration value of the motion sensor. When the control module determines that at least two acceleration values sensed continuously by the accelerometer respectively reach or exceed a predetermined value, the control module turns on the switch to control the power source to provide power to the emitting module, generates control signals, and controls the emitting module to emit the control signals to the sensor monitor to direct the sensor monitor to take action. | 07-05-2012 |
20120173886 | ELECTRONIC DEVICE WITH A FILE AUTHORIZATION MANAGEMENT FUNCTION AND METHOD THEREOF - An electronic device for managing file authorization is provided. The electronic device stores encrypted files. Each encrypted file presets a predetermined password. When receiving an operation signal of one of the encrypted file, the electronic device determines whether the operation signal matches the predetermined password of the selected file. The electronic device processes the file in response to the operation signal if the input matches the predetermined password of the selected file, and does not respond to the operation of the selected file if the input does not match the predetermined password of the selected file. | 07-05-2012 |
20120176043 | LIGHT CONTROL SIGNAL GENERATING CIRCUIT - A light control signal generating circuit includes a photosensitive element, two transistors, and four resistances. A first resistance and the photosensitive element are connected in series between a power voltage terminal and a ground terminal. A base electrode of a first transistor is connected to a node between the first resistance and the photosensitive element, a collecting electrode is connected to the power voltage terminal through a second resistance, and an emitting electrode is connected to the ground terminal through a third resistance. A base electrode of a second transistor is connected to a node between the second resistance and the first transistor, a collecting electrode is connected to the power voltage terminal through a fourth resistance, and an emitting electrode is connected to the ground terminal through the third resistance. An output terminal is formed from a node between the fourth resistance and the second transistor. | 07-12-2012 |
20120194959 | ELECTRONIC DEVICE WITH SURGE SUPPRESSION UNIT - An electronic device includes a power input pin receiving a voltage from an external power supply, a load, and a surge suppression unit connected between the power input pin and the load. The surge suppression unit includes a first transistor, a voltage divider circuit and a capacitor. The first transistor includes a control end, a first conducting end connected to the power input pin, and a second conducting end connected to the load. The voltage divider circuit includes a common node connected to the control end, one end of the voltage divider circuit connected between the first conducting end and the power input pin, and the other end of the voltage divider circuit connected to ground. One end of the capacitor is connected between the second conducting end and the load, and the other end of the capacitor is connected to the control end. | 08-02-2012 |
20120207330 | AUDIO SIGNAL AMPLIFYING CIRCUIT - The present disclosure provides an audio signal amplifying circuit for an electronic device including a processing chip and a speaker. The audio signal amplifying circuit includes an amplifying circuit and an inverting circuit connected to the processing chip to get a first control signal and invert the first control signal to generate a second control signal. The first control signal and/or the second control signal are used to control the operation mode of the amplifying circuit to be in an amplifying mode or in a non-amplifying mode. | 08-16-2012 |
20120274764 | MONITORING SYSTEM AND METHOD FOR STORING VIDEO - A monitoring system for monitoring an area, includes an image capturing module, a storage unit, and a processor. The processor controls the image capturing module to capture images within the monitored area to obtain video signal as a series of frames, and compares every two neighboring frames to determine whether the neighboring frames are the similar according to a preset reference level, and stores one of the neighboring frames in the storage unit with the number of the stored frame increased by one if the neighboring frames is determined to be similar, and stores both the neighboring frames in the storage unit if the neighboring frames are determined to be different. A method for storing video obtained by the monitoring system is also provided. | 11-01-2012 |
20120293161 | ALTERNATING CURRENT VOLTAGE DETECTION CIRCUIT - An AC voltage detection circuit includes a conversion module, a comparison module, and a prompt module. The conversion module connects to an AC power source and converts the AC voltage provided by the AC power source to an AC current, and then converts the AC current to a direct current (DC) voltage reflecting the AC voltage. The comparison module is connected to the conversion module, and compares the DC voltage with a first predetermined voltage and a second lesser predetermined voltage, and produces a control signal when the DC voltage is greater than the first predetermined voltage or less than the second predetermined voltage. The prompt module produces a prompt signal when receiving the control signal. | 11-22-2012 |
20130003985 | AUDIO OUTPUT CONTROLLER AND CONTROL METHOD - An output controller and an method for outputting a signal flow to one or more earphone jacks according to a connection status of each earphone jack. The output controller includes an interface unit having more than one earphone jacks and an output control unit. The output control unit includes a signal input terminal for receiving a signal flow, a detector, and a determining module. The detector detects whether each earphone jack is connected with an earphone and outputs one or more detected signals representing the connection status of the earphone jacks. The determining module outputs the signal flow directly to the connected earphone jack if only one earphone jack is connected to the earphone or distributes the signal flow being amplified correspondingly into each connected earphone jack if more than one earphone jack is connected to the earphones. | 01-03-2013 |
20130009926 | DRIVING CIRCUIT AND LIQUID CRYSTAL DISPLAY USING THE SAME - A driving circuit for driving an LCD includes a common electrode, a number of pixel electrodes, a peripheral circuit, and a processing unit including a first input/output (I/O) port, a second I/O port; and a number of third I/O ports. The first I/O port and the second I/O ports are connected to the common electrode via the peripheral circuit, and each third I/O port is connected to a different pixel electrode. The processing unit controls the first I/O port, the second I/O port, and the third I/O ports to output a first or second voltage according to a display signal, thus the pixel electrodes are at the first or the second voltage accordingly, the common electrode is at a voltage in a range between the second voltage and the first voltage in receiving the voltage output by the peripheral circuit, thus driving the LCD to display an image. | 01-10-2013 |
20130018601 | SENSING CIRCUITAANM ZHANG; JUN-WEIAACI Shenzhen CityAACO CNAAGP ZHANG; JUN-WEI Shenzhen City CNAANM CHUANG; TSUNG-JENAACI Tu-ChengAACO TWAAGP CHUANG; TSUNG-JEN Tu-Cheng TWAANM WONG; SHIH-FANGAACI Tu-ChengAACO TWAAGP WONG; SHIH-FANG Tu-Cheng TWAANM ZHANG; JUNAACI Shenzhen CityAACO CNAAGP ZHANG; JUN Shenzhen City CNAANM YU; QI-LONGAACI Shenzhen CityAACO CNAAGP YU; QI-LONG Shenzhen City CNAANM XIN; YANGAACI Shenzhen CityAACO CNAAGP XIN; YANG Shenzhen City CN - A sensing circuit includes a plurality of sensors, a controller, a multiway switch, a linear optocoupler, and a logical control unit. The plurality of sensors are capable of measuring physical quantity, and each of the plurality of sensors is capable of generating a sensing signal in accordance with the physical quantity. The controller is capable of receiving and analyzing the sensing signals, and transforming the sensing signals into sensing events. The multiway switch is capable of selectively connecting one of the plurality of sensors to the controller. The linear optocoupler is connected between the plurality of sensors and the controller. The logical control unit is capable of controlling the multiway switch to selectively connect one of the plurality of sensors to the optocoupler, and generating a control signal to the controller, wherein the control signal indicating the one of the plurality of sensors connected to the controller. | 01-17-2013 |
20130021001 | STORAGE BATTERY CHARGE CIRCUIT - A storage battery charge circuit for charging a battery is provided. The circuit includes a voltage input port, a converting circuit, and a charge circuit. The voltage input port is for being connected to a power source to receive a logic high level voltage. The converting circuit is connected to the voltage input port to convert the received logic high level voltage into a control signal including a logic high level voltage and a logic low level voltage alternately and the mark space ratio is not equal to one. The charge circuit is connected to the converting circuit to charge the battery or discharge the battery according to the control signal. | 01-24-2013 |
20130148819 | AUDIO PLAYING DEVICE HAVING EARPHONE JACK WITH ROTATION DETECTOR - An audio playing device may operate in a first mode or a second mode. The audio playing device includes a speaker, an earphone jack receiving an earphone plug of an earphone, a sound output driver, a rotation angle detector, and a processor. The sound output driver only drives the speaker when the audio playing device operates in the first mode and only drives the earphone when the audio playing device operates in the second mode. The rotation angle detector generates a first mode change signal when the earphone plug is rotated in the earphone jack along a first direction over a predetermined angle. The processor changes operation of the audio playing device between the first mode and the second mode when the processor receives the first mode change signal from the rotation angle detector. | 06-13-2013 |
20130210492 | COMMUNICATION DEVICE AND METHOD FOR AUTOMATICALLY RECORDING NUMERIC INFORMATION IN SPEECH - A communication device includes a communication unit, a speech recognition module, and a processor. The communication unit builds a communication between the communication unit and an external communication device. The processor records speech between the communication device and the external communication device. The speech recognition module compares each word of the recorded speech with voice samples to determine whether numbers have been spoken. The processor further determines if successive numbers are recorded in a predetermined period, and stores the successive numeric in a storage unit. | 08-15-2013 |
20130223700 | ELECTRONIC DEVICE AND METHOD FOR PROTECTING PERSONAL DATA VIA FINGERPRINT RECOGNITION - A method protects personal data of an electronic device. Different capacitance values between a plurality of points of a fingertip and an electrode layer of a capacitive touch screen of the electronic device are detectable when the capacitive touch screen is touched by the fingertip, and a representation of a fingerprint is acquired according to distribution of the detected capacitance values. If the acquired fingerprint does not match with any predetermined fingerprint, predetermined personal data of the electronic device is protected. If the acquired fingerprint matches with at least one of the predetermined fingerprints, the protection of the personal data is released. | 08-29-2013 |
20130252666 | COMMUNICATION TERMINAL DEVICE AND CONTROL METHOD - A communication terminal device includes a magnetic sensor, a processor, and a power control module. The magnetic sensor detects a current magnetic field generated by induction of internal current in internal circuits of the communication terminal device, and provides a value of strength of the current magnetic field to the processor. The processor compares the value of the strength of the current magnetic field with preset values, and obtains a comparison result. In a situation that the processor determines that the current magnetic field is anomalous according to the comparison result, the processor controls the power control module to withhold power to the communication terminal device. | 09-26-2013 |