摘要:
An object of the present invention is to provide the device for protecting a secondary battery safely from overvoltage and overheating caused by the overcharge by using simple safety device, which provides a contacted safety device which connects between a constant voltage element showing a discharge characteristic in the state of overvoltage and a MIT (metal insulator transition) element showing a discharge characteristic in the state of overheating. Each of the constant voltage element and the MIT element are connected in parallel between a cathode lead and an anode lead of the secondary battery. The contacted safety device has a characteristic combining a discharge/heat dissipation characteristic of the constant voltage element and a discharge characteristic of the MIT element which immediately responds to the heat dissipation of the constant voltage element, resulting in effect of preventing overcharge advantageously since the contacted safety device makes discharge in terms of 2 factors of voltage and temperature in case of overcharge.
摘要:
Disclosed is a secondary battery having a constant-voltage device for preventing the secondary battery from being excessively overcharged. The breakdown voltage of the constant-voltage device is lower than the explosion or ignition voltage of the secondary battery, so the discharge operation may occur before the secondary battery is exploded or ignited even if the voltage of the secondary battery rises above the overcharge voltage, thereby protecting the secondary battery from explosion or ignition. The leakage current value of the constant-voltage device is less than 0.05% of the capacity value of the secondary battery under the maximum charge voltage of the secondary battery, or the breakdown voltage of the constant-voltage device is higher than the maximum charge voltage of the secondary battery. Thus, the constant-voltage device rarely generates the leakage current even if the secondary battery has been charged with the maximum charge voltage.
摘要:
A cogeneration system including an engine, which drives a generator to generate electricity, a cooling/heating unit, which includes at least one compressor, a four-way valve, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle, and a refrigerant over-heating unit to supply heat of cooling water used to cool the engine to a suction-side refrigerant line of the compressor of the cooling/heating unit, and to supply heat of exhaust gas discharged from the engine to the suction-side refrigerant line of the compressor and to a discharge-side refrigerant line of the compressor. In accordance with the cogeneration system, it is possible to maximize absorption of the waste heat of the engine while preventing compressor malfunction, and thus, to increase the refrigerant condensing temperature of the indoor heat exchanger. Thus, an enhancement in heating performance is achieved.
摘要:
A broadcasting system for providing a broadcasting program to a mobile terminal and a method of controlling the same are provided. The method includes the steps of selecting a broadcasting program through a mobile terminal, selecting a broadcasting type of the selected broadcasting program through the mobile terminal, selectively transmitting at least one of video data, audio data, and text data of the selected broadcasting program based on the selected broadcasting type from a broadcasting station server to the mobile terminal, and displaying the transmitted data on the mobile terminal or outputting the transmitted data through the mobile terminal.
摘要:
An organic light emitting display and a control method thereof, which can control brightness of an image displaying part depending on neighboring brightness. The organic light emitting display includes: an optical sensing part for outputting a sensed signal corresponding to a neighboring brightness; a gamma controller for outputting a gamma correction value corresponding to the sensed signal; a driver for outputting a selection signal and a gamma-corrected data signal according to the gamma correction value; and an image displaying part for displaying an image according to the data signal and the selection signal outputted from the driver. In this configuration, the display uses the gamma correction value corresponding to neighboring brightness and controls the brightness of the display to vary depending on the neighboring brightness, thereby lengthening lifespan of a pixel of the display and reducing power consumption.
摘要:
Disclosed is a high voltage generator comprising: a first voltage level detector for detecting a voltage level of the high voltage; a second voltage level detector for detecting difference between the high voltage and a power supply voltage; a high voltage pump for performing a pumping operation to generate a high voltage when one of output signals of the first voltage level detector and the second voltage level detector is enabled; and a controller for receiving the output signal of the second voltage level detector, and for connecting a terminal through which the high voltage is output with the power supply voltage when the high voltage is lower than the power supply voltage.
摘要:
An organic electroluminescence device includes a buffer formed in a polygonal structure corresponding to each of sub-pixels, an electrode separator formed along an outer periphery of the buffer so as to separate the sub-pixels, an emission region formed in an inner region defined by the buffer, and an electric connection region formed in a region protruding from one side of the buffer.
摘要:
Disclosed herein are an adhesive sheet comprising a cured acrylic polymer, hollow polymeric microspheres dispersed and ruptured in the cured acrylic polymer, and hollow parts formed by rupturing the hollow polymeric microspheres dispersed in the cured acrylic polymer, and a preparation method thereof.
摘要:
The present invention provides a nitride semiconductor light-emitting device comprising a first conductive nitride semiconductor layer; an active layer formed on the first conductive nitride semiconductor layer, and having at least one quantum well layer and at least one quantum barrier layer alternatively laminated; and a second conductive nitride semiconductor layer formed on the active layer, wherein at least one of the quantum well layer and quantum barrier layer in the active layer is doped with elemental Al in a concentration of less than 1%.
摘要:
A power-up detector comprises a voltage divider for dividing a power voltage in a predetermined ratio, and a potential detector for comparing a predetermined potential with a potential divided by the voltage divider, and outputting the comparison result. Although the state of an external power voltage, which is inputted after a power-up signal is generated when a power voltage rises over a predetermined level, is changed by noise, the level of the power-up signal is not changed unless the power voltage falls below a predetermined level. Accordingly, a semiconductor device can be stably initialized.