Abstract: An illumination device and a method controlling the same are provided. The illumination device produces a pulse width modulation signal to control an illumination light source of the illumination device. The illumination light source is used to illuminate an environment. A driver of the illumination device provides a current to the illumination light source so the illumination light source emits light and a light detecting element of the illumination device detects a first brightness in the environment when the pulse width modulation signal is at high potential. The driver stops providing the current to the illumination light source and the light detecting element detects a second brightness in the environment when the pulse width modulation signal is at low potential. Thus, through a single light detecting element, two different levels of brightness in the illuminated environment are detected.

Abstract: An illumination device and a method controlling the same are provided. The illumination device produces a pulse width modulation signal to control an illumination light source of the illumination device. The illumination light source is used to illuminate an environment. A driver of the illumination device provides a current to the illumination light source so the illumination light source emits light and a light detecting element of the illumination device detects a first brightness in the environment when the pulse width modulation signal is at high potential. The driver stops providing the current to the illumination light source and the light detecting element detects a second brightness in the environment when the pulse width modulation signal is at low potential. Thus, through a single light detecting element, two different levels of brightness in the illuminated environment are detected.

Abstract: A fuel cell system including a fuel cell power generator, a first state detecting unit, an electronic load circuit, an external load power supply circuit, a secondary battery, a charge module, and a control unit is provided. The first state detecting unit detects an output voltage and an output power of the fuel cell power generator. The electronic load circuit performs a current-sinking operation on the fuel cell power generator. The external load power supply circuit receives a power from the fuel cell power generator and supplies the power to an external load. The control unit controls the current-sinking operation of the electronic load circuit according to the detection result of the first state detecting unit, so as to adjust the output voltage of the fuel cell power generator and enable at least one of the electronic load circuit, the charge module, and the external load power supply circuit.

Abstract: A fuel cell system including a fuel cell power-generating part, a state detector, a charging circuit, a secondary cell, a control unit, a first internal load power supply circuit, a second internal load power supply circuit, a path selection circuit, an internal load, and an external load power supply circuit is provided. The first internal load power supply circuit and the charging circuit are coupled to the fuel cell power-generating part. The secondary cell is coupled between the charging circuit and the second internal load power supply circuit. The path selection circuit determines whether the first internal load power supply circuit or the second internal load power supply circuit provides power to the internal load according to a first electric power of the fuel cell power-generating part that is detected by the state detector, so as to reduce energy consumption.

Abstract: A power supply module is formed as a package body suitable to be assembled in a light emitting diode illumination apparatus. The power supply module includes a light emitting diode driver, a feedback control unit, a current converting unit, and a package material. The light emitting diode driver, the feedback control unit, and the current converting unit are packaged integrally by the package material. The current converting unit is suitable for supplying power to the light emitting diode driver and the feedback control unit. The feedback control unit is suitable to receive a feedback signal from a light source module disposed outside of the package body and provide an adjusting signal to the light emitting diode driver, so as to make the light emitting diode driver to adjust the magnitude of a control current and provide the control current to the light source module.

Abstract: An illumination device and a control method of the illumination device are provided. The illumination device includes a thermal sensor and a light emitting diode (LED) module. The control method include steps of: enabling the thermal sensor to detect the environment temperature outside the illumination device, and comparing the environment temperature with a threshold value, wherein if the environment temperature is higher than the threshold value, the driven current of the LED module is reduced and the thermal sensor is shut down within a continued period of time.

Abstract: An illumination device and a control method thereof are provided. The illumination device includes a fan and a light emitting diode module capable of emitting a light beam. The control method includes: detecting a fan signal of the fan; determining whether an operation of the fan is abnormal according to the fan signal, wherein a driving current of the LED module is reduced when the operation of the fan is determined to be abnormal; and a driving current of the LED module is reduced to a predetermined rang of the normal rated driving current when the fan is determined to be stop according to the fan signal.

Abstract: A liquid measurement system detects a surplus status of a liquid fuel in a fuel cell. The liquid measurement system includes a storage device, two electrodes, a charging and discharging circuit, and a processing unit. The storage device has a containing space for storing the liquid fuel and disposed between the electrodes. The electrodes are oppositely disposed on the outer surface of the storage device to form a capacitor. The charging and discharging circuit is electrically connected to the electrodes to cyclically charge/discharge the capacitor between a first voltage and a second voltage to generate an output signal. The processing unit is electrically connected to the charging and discharging circuit to receive the output signal and obtains a wave number of the output signal within a specific time interval to determine the surplus status of the liquid fuel in the containing space.

Abstract: A power supply system is adapted to providing a rated power to a load, and includes a fuel cell, a secondary battery, a charging device, and a control unit. The fuel cell provides a first power. The secondary battery provides a second power and is electrically connected with the fuel cell. The charging device is electrically connected with the fuel cell and the secondary battery. The control unit is electrically connected with the fuel cell, the secondary battery, and the charging device. When the first power is smaller than the rated power, the control unit enables the secondary battery to provide power to the load. When the secondary battery supplies power to the load, the control unit enables the charging device so that the secondary battery is charged by the fuel cell via the charging device.