| Patent application number | Description | Published |
|---|
| 20080203971 | Battery state monitoring circuit and battery device - An object of the present invention is to provide a battery state monitoring circuit and a battery device which are capable of normally operating when a charger ( | 08-28-2008 |
| 20080224664 | Charging and discharging control circuit and charging type power supply device - An overcharge detecting comparator ( | 09-18-2008 |
| 20090009133 | Battery state monitoring circuit and battery apparatus - Provided is a battery state monitoring circuit which is capable of preventing a discharge leak current from a battery so as to eliminate a load conventionally imposed on a user, including: a battery state detector circuit that detects a state of the battery based on a voltage of the battery; a transmitting terminal that transmits battery state information indicative of the state of the battery to an outside; a receiving terminal that receives battery state information of another battery from the outside; a transistor that is used for transmitting the battery state information, and has any one of two terminals except for a control terminal connected to the transmitting terminal; and a diode that is connected in a direction opposite to a direction of a parasitic diode disposed between the two terminals of the transistor, the diode being disposed between the transmitting terminal and one terminal of the transistor. | 01-08-2009 |
| 20090079395 | Charge and discharge control circuit and rechargeable power supply device - A charge and discharge control circuit which accommodates pulsed charge and pulsed discharge and can control charge and discharge of a secondary battery with safety, and a rechargeable power supply device having the same built therein are provided. The charge and discharge control circuit includes a delay time switching circuit for shortening a delay time of overcharge detection after charge inhibition is canceled. When overcharge is detected after the charge inhibition is canceled, the charge is inhibited in a delay time which is shorter than a normal delay time of the overcharge detection. | 03-26-2009 |
| 20090185323 | OVERHEAT PROTECTION CIRCUIT - In order to provide an overheat protection circuit having a small mounting area, the overheat protection circuit includes: a resistor bridge circuit which includes: a plurality of resistors each having a temperature coefficient; an input terminal; and an output terminal; and a comparator circuit connected to the output terminal and the input terminal of the resistor bridge circuit. Parts are each provided in the vicinity of one of the plurality of resistors each having the temperature coefficient, and the comparator circuit outputs an overheat detection signal when a temperature of one of the parts is equal to or higher than an overheat detection temperature. With this structure, a large number of parts can be protected from overheating by a minimum number of overheat protection circuits. Therefore, a circuit scale becomes smaller, and hence a cost for overheat protection becomes lower. | 07-23-2009 |
| 20090213511 | BATTERY PROTECTION CIRCUIT AND BATTERY DEVICE - Provided is a battery protection circuit and a battery device which may be manufactured at lower cost. Before all terminals of a battery protection circuit are each connected to batteries, even when a logical circuit malfunctions by an operation of a parasitic bipolar transistor formed by P-wells due to a connection order in which the batteries are connected, the logical circuit is reset by an operation of a parasitic bipolar transistor formed by the P-wells. For this reason, a charge/discharge path of the batteries is not interrupted due to the connection order. Accordingly, no limitation is placed on the connection order. | 08-27-2009 |
| 20090243543 | CHARGE AND DISCHARGE CONTROL CIRCUIT AND BATTERY DEVICE - Provided is a charge and discharge control circuit capable of further preventing poor charge of a battery, and a battery device. Cell balance periods are detected before charge of respective batteries is stopped even when an overcharge detection voltage of a certain charge and discharge control circuit becomes lower than a cell balance period detection voltage thereof due to process variations occurring in mass production of the charge and discharge control circuits. That is, the charge of the respective batteries is stopped after cell balance control. Therefore, the respective batteries can be further prevented from being poorly charged. | 10-01-2009 |
| 20090243546 | CHARGE AND DISCHARGE CONTROL CIRCUIT AND BATTERY DEVICE - Provided are a charge and discharge control circuit capable of reducing a circuit size, and a battery device. In a charger reverse connection detection circuit ( | 10-01-2009 |
| 20110050176 | BATTERY STATE MONITORING CIRCUIT AND BATTERY DEVICE - Provided are a battery state monitoring circuit and a battery device that are capable of reliably controlling charge by a charger even if a voltage of a secondary battery drops to around 0 V. In the battery device provided with the battery state monitoring circuit, respective gate voltages of a P-type metal oxide semiconductor (PMOS) transistor and an N-type metal oxide semiconductor (NMOS) transistor, which together form a voltage detection circuit for detecting a voltage of around 0 V of the secondary battery, are applied by a voltage dividing resistor circuit that is connected across terminals of the secondary battery. | 03-03-2011 |
| 20110089906 | BATTERY STATE MONITORING CIRCUIT AND BATTERY DEVICE - Provided are a battery state monitoring circuit with a small number of terminals and a battery device including the battery state monitoring circuit. An output of an overcharge detection circuit ( | 04-21-2011 |
| 20110101918 | BATTERY STATE MONITORING CIRCUIT AND BATTERY DEVICE - Provided are a battery state monitoring circuit capable of detecting disconnection of a battery from a power supply terminal or a ground terminal, and a battery device including the battery state monitoring circuit. The battery state monitoring circuit includes voltage detection circuits provided between the power supply terminal and an intermediate terminal and between the intermediate terminal and another intermediate terminal. For example, if a battery ( | 05-05-2011 |
