Abstract:
A protection monitoring circuit 101 includes a protection circuit 130 which detects at least one of overcharge, overdischarge, and overcurrent of a chargeable and dischargeable secondary battery 110 and protects the secondary battery 110 by performing an ON/OFF control of transistors M11 and M12, and a secondary battery monitoring circuit 120 which detects a state of the secondary battery 110. The protection circuit 130 supplies a power supply voltage to the secondary battery monitoring circuit 120. If overdischarge of the secondary battery is detected, the protection circuit 130 inhibits the supply of the power supply voltage to the secondary battery monitoring circuit 120 after a predetermined time has elapsed or after a control signal for inhibiting the supply of power supply voltage is received from the secondary battery monitoring circuit 120.
Abstract:
A battery status detecting method for detecting a battery status of a secondary battery that supplies power to an electrical load is disclosed. This method includes measuring a discharge current value of the secondary battery, and estimating the dischargeable capacity or the dischargeable time of the secondary battery with the measured discharge current value based on discharge characteristics of the secondary battery indicating the discharge status of the secondary battery when the voltage of the secondary battery drops to a predetermined voltage specified by the electrical load.
Abstract:
In a recording/reproducing device for use in recording and reproducing data on and from a recording medium while moving read/write head means relative to the recording medium in a moving direction, which comprises a carriage supporting the read/write head means and guided by a guiding member in the moving direction, and a voice coil motor comprising a voice coil and a magnetic circuit device for driving the carriage in the moving direction. The carriage has a coil holding portion by which the voice coil is fixedly held in the condition that the coil axis is arranged in the moving direction. The voice coil is applied with a driving electric current for driving the carriage. The magnetic circuit device is fixedly disposed adjacent to the voice coil to generate a magnetic field intersecting the driving current flowing through the voice coil, the voice coil moving in the moving direction together with the carriage by an interaction of the driving current and the magnetic field.
Abstract:
In a motor drive for driving a motor having three-phase coils in both a high rotation speed mode in which the motor rotates at a high rotation speed and a low rotation speed mode in which the motor rotates at a low rotation speed which is extremely lower than the high rotation speed, the motor drive includes a mode selection circuit for making a connection of the three-phase coils unipolar and bipolar connections on the high and the low rotation speed modes, respectively. A frequency generation pattern detects a rotation speed of the motor. On the basis of the rotation speed detected by the frequency generation pattern, a combination of a PLL circuit and a driving transistor drives the motor at the high and the low rotation speeds in the high and the low rotation speed modes, respectively.
Abstract:
A magnetic recording/reproducing device which incorporates a lift arm and presser assembly, wherein the lift arm and presser assembly includes a lift arm holding a magnetic head, a carriage attached with the lift arm which is movable relative to the carriage, and a lift arm pressing spring attached to the carriage for pressing the lift arm. The lift arm pressing spring presses the lift arm at a position closer to the magnetic head than to a middle point between the magnetic head and a center portion of the lift arm.
Abstract:
A flexible disk drive includes a magnetic head carriage, a linear motor for moving the carriage, and a carriage locking mechanism for locking the carriage in response to ejecting action of a flexible disk from the flexible disk drive. A lever unit has an ejecting lever and a locking lever. The ejecting lever is a part of an ejecting mechanism for ejecting the flexible disk from the flexible disk drive. The locking lever is disposed in the vicinity of the carriage, and locks the carriage from movement after the flexible disk is ejected from the flexible disk drive by the ejecting lever. The lever unit is made of non-magnetic material such as resin as one body.
Abstract:
A battery condition detector configured to detect a micro short circuit of a rechargeable battery is disclosed. The battery condition detector includes a processing part configured to calculate the remaining capacity and the full-charge capacity of a rechargeable battery 200 and to determine the micro short circuit of the rechargeable battery 200 by detecting an overcharge of the rechargeable battery 200 based on a charged capacity charged during the charging of the rechargeable battery 200, the remaining capacity calculated at a calculation time immediately before the start of the charging, and the full-charge capacity calculated before the start of the charging; and a communications part 70 configured to output a signal according to the determination result of the processing part 50.
Abstract:
A battery status detecting method for detecting a battery status of a secondary battery that supplies power to an electrical load is disclosed. This method includes measuring a discharge current value of the secondary battery, and estimating the dischargeable capacity or the dischargeable time of the secondary battery with the measured discharge current value based on discharge characteristics of the secondary battery indicating the discharge status of the secondary battery when the voltage of the secondary battery drops to a predetermined voltage specified by the electrical load.
Abstract:
A battery status detecting device, the battery status detecting device being configured to detect a status of a rechargeable battery which powers an electronic device, the battery status detecting device includes a capacity degradation rate calculating part configured to calculate a capacity degradation rate of the rechargeable battery; an internal resistance value calculating part configured to calculate an internal resistance value of the rechargeable battery; a determining part configured to determine necessity of exchange of the rechargeable battery based on the capacity degradation rate calculated by the capacity degradation rate calculating part and the internal resistance value calculated by the internal resistance value calculating part; and an outputting part configured to output a signal corresponding to a determination result of the determining part, wherein the determining part determines that the exchange of the rechargeable battery is necessary in a case where one of or both of the capacity degradation rate calculated by the capacity degradation rate calculating part and the internal resistance value calculated by the internal resistance value calculating part reach a value requiring the exchange of the rechargeable battery.