Patent application number | Description | Published |
20080237807 | SEMICONDUCTOR DEVICE - A second electrode is selectively brought into contact with a semiconductor substrate. Specifically, an insulating film having opening portions is provided on the second principal surface of the semiconductor substrate, and the second electrode is provided on the insulating film. The second electrode comes into contact with the second principal surface of the semiconductor substrate through the opening portions. The total area of the opening portions is approximately the half of the total area of the second principal surface of the semiconductor substrate. Consequently, minority carriers (holes) are prevented by the insulating film from being drawn out, and thus, the loss of the minority carriers around the second electrode is decreased. Accordingly, the conductivity modulation effect is improved. Therefore, the forward voltage can be decreased even with a structure in which the impurity concentration of a p type impurity region is decreased in order to shorten a reverse recover time. | 10-02-2008 |
20090230393 | DIODE - In a pn junction diode having a conductivity modulating element provided on a first principal surface of a semiconductor substrate, when an impurity concentration of a p type impurity region is lowered to shorten a reverse recovery time, hole injection is suppressed, thereby causing a problem that a forward voltage value is increased at a certain current point. Moreover, introduction of a life time killer to shorten the reverse recovery time leads to a problem of increased leak current. On an n− type semiconductor layer that is a single crystal silicon layer, a p type polycrystalline silicon layer (p type polysilicon layer) is provided. Since the polysilicon layer has more grain boundaries than the single crystal silicon layer, an amount of holes injected into the n− type semiconductor layer from the p type polysilicon layer in forward voltage application can be suppressed. Moreover, a natural oxide film formed between the n− type semiconductor layer and the p type polysilicon layer in formation of the p type polysilicon layer can also reduce the amount of holes injected into the n− type semiconductor layer. Thus, a time to extract the holes in reverse voltage application, that is, a reverse recovery time can be shortened without using a life time killer. | 09-17-2009 |
20100015772 | METHOD OF MANUFACTURING SEMICONDUCTOR DEVICE - An n type impurity region is provided below a gate electrode. By setting a gate length to be less than a depth of a channel region, a side surface of the channel region and a side surface of the n type impurity region adjacent to the channel region form a substantially perpendicular junction surface. Thus, since a depletion layer widens uniformly in a depth direction of a substrate, it is possible to secure a predetermined breakdown voltage. Furthermore, since an interval between the channel regions, above which the gate electrode is disposed, is uniform from its surface to its bottom, it is possible to increase an impurity concentration of the n type impurity region, resulting in an achievement of a low on-resistance. | 01-21-2010 |
Patent application number | Description | Published |
20110117396 | Battery Pack and Method of Preventing Cap Disassembly or Cell Replacement in the Battery Pack - A battery pack having a function for preventing operation of the battery pack when an abnormal replacement of a battery cell is detected or preventing a use of the battery pack in which a cap has been removed. The battery pack generates an encryption code and writes the encryption code to data flash when a battery cell is normally discharged according to a first voltage, and if an abnormal power-on reset is detected on the battery cell, the battery pack may check the stored encryption code to a second encryption code generated upon power-on reset. If the codes do not match, firmware of the battery pack is deleted and/or a fuse is blown, making it is possible to prevent the battery pack from being re-used when the battery cell has been replaced or in which a cap has been removed. | 05-19-2011 |
20110121784 | BATTERY PACK - A battery pack is disclosed that includes a plurality of battery cells and a plurality of temperature sensors. Each of the temperature sensors is for sensing a temperature of a corresponding one or more of the battery cells to generate a temperature signal, and the temperature sensors are divided into groups of temperature sensors. A plurality of A/D converters is provided, and each of the A/D converters is coupled to a corresponding one of the groups of temperature sensors to convert the temperature signal into a digital signal. An identification signal module is coupled to the A/D converters for applying different identification signals to the plurality of A/D converters, respectively. A controller is coupled to the A/D converters for receiving the identification signals and the temperature signal, and for identifying a temperature of each of the battery cells through the identification signals. | 05-26-2011 |
20110161024 | BATTERY MULTI-SERIES SYSTEM AND COMMUNICATION METHOD THEREOF - A battery multi-series system and a communication method thereof. The battery multi-series system includes a master battery management system managing a battery; and a block master battery management system connected to the master battery management system and receiving data from at least one slave battery management system and storing the received data, wherein the master battery management system receives data periodically from the block master battery management system. | 06-30-2011 |
20120179399 | BATTERY SYSTEM AND ENERGY STORAGE SYSTEM INCLUDING THE SAME - A battery system having components with reduced maximum voltage tolerance requirements is disclosed. The battery system includes a battery pack with battery modules, and measuring units, which are connected to the battery modules. The measuring units have first analog front ends (AFEs) for monitoring the at least two battery modules. Each first AFE is configured to transmit information related to the monitored characteristic via an isolator to a processor configured to control the battery pack based on the transmitted information. The isolator receives the transmitted information from an AFE which is not connected to the battery module having the least electric potential or to the battery module having the greatest electric potential. | 07-12-2012 |
20120229142 | APPARATUS FOR DETECTING LEAKAGE CURRENT OF BATTERY - An apparatus for detecting leakage current of a battery is disclosed. The apparatus includes a leakage current generating unit, a leakage current measuring unit, and a peak holding unit. | 09-13-2012 |
20120280694 | BATTERY SYSTEM - A battery system is disclosed. In one embodiment, the system includes i) a plurality of battery modules each of which is configured to store power, wherein each battery module is electrically connected to at least one other battery module and ii) a plurality of management units configured to monitor states of the battery modules. Each management unit is electrically connected to at least one other management unit and one or more of the battery modules. Each management unit may include: at least one measuring unit configured to perform the monitoring and a receiving unit configured to i) receive measurement data including the monitoring results from the measuring unit via a first communication protocol and ii) receive measurement data from another receiving unit included in another management unit via a second communication protocol different from the first communication protocol. | 11-08-2012 |
20130069429 | BATTERY MANAGING APPARATUS, BATTERY PACK, AND ENERGY STORAGE SYSTEM - An energy storage system having a number of trays with each tray having a number of battery cells in which power is controllably stored and discharged. A first Battery Management System (BMS) is electrically coupled to a tray contained in a rack of trays. A second BMS is electrically coupled to and controls the first BMS. The first BMS includes a control unit electrically coupled to and controlling the battery cells. It further includes a switch unit electrically coupled to the control unit and selectively applying driving power according to a control signal from the second BMS. | 03-21-2013 |
20130141106 | CIRCUIT FOR MEASURING VOLTAGE OF BATTERY AND POWER STORAGE SYSTEM USING THE SAME - A circuit for measuring voltage of a battery and a power storage system using the same are disclosed. According to one aspect, the circuit includes a switching element connected to the battery and configured to output a first signal at a first voltage level. The switching element is configured to be turned-on in response to a voltage measuring control signal. The circuit also includes a voltage conversion circuit connected to the switching element. The voltage conversion circuit is configured to output a second signal at a second voltage level that is proportional to the first voltage level. An analog-digital converter is configured to receive the second signal and convert the received second signal into a digital signal. A controller is configured to transfer the voltage measurement control signal to the switching element, and receive the digital signal from the analog-digital converter. | 06-06-2013 |