Abstract: A feedback device for a constant current driver controls a power supply module in the constant current driver to generate an output voltage. The constant current driver drives an electrical load with an output current. The feedback device includes a feedback control module and a feedback output unit. The feedback control module is utilized for receiving a load driven voltage related to the electrical load and generating a control voltage accordingly. The feedback output unit is utilized for generating a feedback current via an equivalent resistor of the feedback output unit according to a voltage difference between the control voltage and a feedback voltage of the power supply module. The power supply module controls the magnitude of the output voltage according to the feedback current, allowing the constant current driver to drive the electrical load with the output current.

Abstract: A feedback device for a constant current driver controls a power supply module in the constant current driver to generate an output voltage. The constant current driver drives an electrical load with an output current. The feedback device includes a feedback control module and a feedback output unit. The feedback control module is utilized for receiving a load driven voltage related to the electrical load and generating a control voltage accordingly. The feedback output unit is utilized for generating a feedback current via an equivalent resistor of the feedback output unit according to a voltage difference between the control voltage and a feedback voltage of the power supply module. The power supply module controls the magnitude of the output voltage according to the feedback current, allowing the constant current driver to drive the electrical load with the output current.

Abstract: An illuminating surveillance camera includes a sensing module to sense a human body temperature and environment luminance and generate a characteristic signal, a surveillance camera module having a controller to generate a controlling signal in response to the characteristic signal and an illuminating module installed on a side of the surveillance camera to project light in response to the controlling signal.

Abstract: A camera structure includes a camera, a frame defining a space to partially contain the camera, at least one plate connected to the frame to cover the camera and luminous elements securely fixed on the surface of the camera, wherein the luminous elements provide lights to the plate which is used as a billboard showing commercial messages to the public.

Abstract: A camera structure includes a power supply module, supplying power to the camera, a sensing device, positioned near the camera to detect luminance variations around the camera, a speaker, sending out sounds in situation where luminance variations are detected by the sensing device, lighting components, generating light in situations where the power supply module is disabled and the sensing device detects luminance variations and a battery module, providing back up power in situation where the power supply module is disabled.

Abstract: A remote device for changing the display content of the display module in a surveillance camera includes at least one surveillance camera, at least one side of each surveillance camera having a display module, each display module electrically connected to a video/audio control circuit. The video/audio control circuit is electrically connected to a display control module of a digital video/audio storage device via a screen transmission line. The display control module has a port for connecting an input device, thereby the display content shown on the display module can be changed by the data input from the input device.

Abstract: A surveillance device with display and light-emitting, is a photographic apparatus including a cover body, a display module and a plurality of light-emitting modules, wherein the cover body covers a photographic unit and there are the display module and the plurality of light-emitting modules set around the cover body, which power is provided by a power supply module. The text message shown by the display module and the flashing light of the light-emitting modules, both increase the highlighting effect of the photographic apparatus and become malfunction indications.

Abstract: The present invention relates to a surveillance device, which includes a device body, a display module mounted to at least one side surface of the device body, and at least one light-emitting diode mounted to at least one side of the device body. The display module can be a liquid crystal display (LCD) or an LED display screen. With the above arrangement, the operation of light-emitting diode helps identifying the location where the device body is mounted and also helps identifying if the device body is in normal operation and further, the arrangement of the display module provides practical advantages of criminal deterrence, advertisement effect, status notification, and information transmission.

Abstract: A waterproof and shockproof cover for a PAD computer is disclosed. The cover comprises an upper housing, a base housing, a glass, a first rubber ring, a second rubber ring and four shockproof elements. The base housing is corresponding to the upper housing, wherein the upper housing comprises a first connection and the base housing comprises a second connection corresponding to the first connection for fastening with each other. The upper housing comprises a viewing window hole and a first groove formed around the rim of the viewing hole, and the first rubber ring is disposed within the first groove. The glass covers the viewing window hole and the first rubber ring. The four shockproof elements disposed respectively at four corners of a rectangular accommodation space of the base housing for bearing the PAD computer.

Abstract: A driving apparatus and a driving method thereof are provided. The driving apparatus includes a digital to analog converter and a signal amplifier. The digital to analog converter is used for receiving a digital data and converting the digital data to an analog signal. The signal amplifier is coupled to the digital to analog converter. The signal amplifier is used for receiving the analog signal to generate a driving signal. The signal amplifier also dynamically changes the driving ability of the driving signal according to at least one bit of the digital data.

Abstract: A waterproof battery charger includes a housing and a charging assembly within the housing. The housing includes an upper housing defining a first recess and a lower housing defining a second recess. The lower housing are hinged together. The lower housing includes an elastic sealing layer that can be elastically deformed to provide a seal when the upper housing and the lower housing are closed together.

Abstract: A driving apparatus and a driving method thereof are provided. The driving apparatus includes a digital to analog converter and a signal amplifier. The digital to analog converter is used for receiving a digital data and converting the digital data to an analog signal. The signal amplifier is coupled to the digital to analog converter. The signal amplifier is used for receiving the analog signal to generate a driving signal. The signal amplifier also dynamically changes the driving ability of the driving signal according to at least one bit of the digital data.

Abstract: A driving apparatus and a driving method thereof are provided. The driving apparatus includes a digital to analog converter and a signal amplifier. The digital to analog converter is used for receiving a digital data and converting the digital data to an analog signal. The signal amplifier is coupled to the digital to analog converter. The signal amplifier is used for receiving the analog signal to generate a driving signal. The signal amplifier also dynamically changes the driving ability of the driving signal according to at least one bit of the digital data.

Abstract: A calibration circuit for voltage-controlled oscillator (VCO) includes a calibration bias generator, a VCO, a detection unit, a micro control unit, an adjuster unit, a phase-locked loop (PLL) unit, a control voltage detection unit, and a control switch set. The calibration bias generator outputs a first control voltage. The VCO outputs an oscillation frequency according to the first control voltage. The detection unit detects the oscillation frequency and outputs the detection result signal to the micro control unit. The micro control unit outputs an adjust signal according to the detection result signal. The adjuster unit receives the adjust signal voltage and adjusts the oscillation frequency output from the VCO according to the adjust signal voltage. The PLL unit outputs a second control voltage to the VCO. The control voltage detection unit outputs voltage-detection signal to the micro control unit, which outputs the adjust signal according to the voltage-detection signal.

Abstract: A driving apparatus and a driving method thereof are provided. The driving apparatus includes a digital to analog converter and a signal amplifier. The digital to analog converter is used for receiving a digital data and converting the digital data to an analog signal. The signal amplifier is coupled to the digital to analog converter. The signal amplifier is used for receiving the analog signal to generate a driving signal. The signal amplifier also dynamically changes the driving ability of the driving signal according to at least one bit of the digital data.

Abstract: A modulation method and a modulation apparatus in a phase-locked loop (PLL) provided. The modulation apparatus comprises a modulator, a crystal oscillator, a controllable R-divisor frequency divider, a controllable N-divisor frequency divider and a voltage-controlled oscillator (VCO). The crystal oscillator generates a fixed frequency oscillating signal. The controllable R-divisor frequency divider receives the oscillating signal from the crystal oscillator and divides the frequency by R. The VCO generates a frequency signal based on a voltage-controlled signal provided by the PLL and feedbacks the frequency signal to the controllable N-divisor frequency divider. The controller N-divisor frequency divider receives a feedback frequency from the VCO and divides the frequency by N.

Abstract: A calibration circuit for voltage-controlled oscillator (VCO) includes a calibration bias generator, a VCO, a detection unit, a micro control unit, an adjuster unit, a phase-locked loop (PLL) unit, a control voltage detection unit, and a control switch set. The calibration bias generator outputs a first control voltage. The VCO outputs an oscillation frequency according to the first control voltage. The detection unit detects the oscillation frequency and outputs the detection result signal to the micro control unit. The micro control unit outputs an adjust signal according to the detection result signal. The adjuster unit receives the adjust signal voltage and adjusts the oscillation frequency output from the VCO according to the adjust signal voltage. The PLL unit outputs a second control voltage to the VCO. The control voltage detection unit outputs voltage-detection signal to the micro control unit, which outputs the adjust signal according to the voltage-detection signal.

Abstract: A modulation method and a modulation apparatus in a phase-locked loop (PLL) provided. The modulation apparatus comprises a crystal oscillator, a controllable R-divisor frequency divider, a controllable N-divisor frequency divider and a voltage-controlled oscillator (VCO). The crystal oscillator generates a fixed frequency oscillating signal. The controllable R-divisor frequency divider receives the oscillating signal from the crystal oscillator and divides the frequency by R. The VCO generates a frequency signal based on a voltage-controlled signal provided by the PLL and feedbacks the frequency signal to the controllable N-divisor frequency divider. The controller N-divisor frequency divider receives a feedback frequency from the VCO and divides the frequency by N.