Minebea Mitsumi Inc.

Minebea Company, Limited

Shigemi Masuda

Norihito Iida

Toshikazu Koshiba

Shinji Totsuka

Yoshihiro Nakamura

Kiyoshi Omori

Hiroki Kokubo

Naoki Tsuji

Naoki Yamaguchi

Eiji Minami

Shinsuke Todoroki

Takahiro Hayashida

A body motion determination system for determining whether a body motion of a subject (S) on a bed (BD) presents or not, includes a load detector () configured to detect a load of the subject on the bed; a non-negative-valued average calculating unit () configured to calculate a non-negative-valued average of a detection value of the load detector; and a threshold value setting unit () configured to set a threshold value to be used in determining whether the body motion of the subject presents or not, based on the non-negative-valued average calculated in a resting period in which the subject merely performs a respiration.

Body motion determination system and biological state monitoring system

A degradation-determination system includes at least four strain gauges that are installed on a principal surface of a lithium-ion battery and each of which is configured to detect pressure of a battery surface at a corresponding installation position, and a degradation determining unit configured to determine degradation of the lithium-ion battery based on measured values at the strain gauges. The degradation determining unit is configured to estimate a maximum expansion position where volume expansion is maximal in a region defined by the strain gauges, of the surface of the lithium-ion battery.

Degradation-determination system and method for determining degradation of secondary battery

A motor drive control device includes a control circuit configured to output a drive control signal for driving a motor, and a drive circuit configured to drive the motor with the drive control signal. The control circuit calculates a lead angle value &#x3b4; allowing a d-axis current value Id of a two-phase rotating coordinate system to be zero with a q-axis current value Iq calculated from drive current values Iu, Iv, and Iw of a coil of the motor and rotation speed &#x3c9; of a rotor of the motor. The control circuit performs a space vector conversion based on an angle &#x3c3; obtained by adding the lead angle value &#x3b4; and rotation angle &#x3b8; and voltage command value Vref of the two-phase rotating coordinate system calculated to reduce a difference between the q-axis current value Iq and a q-axis current command value Iqref, to generate the drive control signal.

Motor drive control device and motor drive control method

A motor drive control device includes a drive circuit configured to drive a motor with a drive control signal for driving the motor, and a control circuit configured to perform a vector control arithmetic operation based on a detection result of drive currents of coils of the motor, to generate the drive control signal and supply the drive control signal to the drive circuit. When generating the drive control signal, the control circuit estimates a rotation angle of a rotor of the motor and a rotation speed of the rotor with a q-axis current value of a two-phase rotating coordinate system calculated with a detection result of the drive current, and a q-axis voltage command value of the two-phase rotating coordinate system, by using a linear Kalman filter including a prediction step and an update step, using a stationary Kalman filter with the prediction step expressed linearly and time-invariantly.

A degradation-determination system includes a volume change detecting unit configured to detect a volume change of a lithium-ion battery, a capacity change detecting unit configured to detect a capacity change of the lithium-ion battery, and a charge control unit configured to control charge of the lithium-ion battery. The charge control unit is configured to determine that the lithium-ion battery is in a state of degradation, upon occurrence of a condition in which volume expansion of the lithium-ion battery is detected by the volume change detecting unit, in conjunction with a condition in which a decrease in a capacity of the lithium-ion battery is not detected by the capacity change detecting unit.

A biological information monitoring system () configured to monitor biological information of a subject (S) on a bed (BD) includes at least one load detector () provided below the bed or legs of the bed and configured to detect a load of the subject on the bed, a waveform calculation unit () configured to calculate a waveform indicating a temporal variation in a detected value of the at least one load detector in accordance with respiration or a heartbeat of the subject, and a biological information calculation unit () configured to calculate a respiration rate or a heart rate of the subject by using the waveform. The biological information calculation unit includes a first calculation unit () configured to calculate the respiration rate or the heart rate of the subject by a first means based on the waveform, a second calculation unit () configured to calculate the respiration rate or the heart rate of the subject by a second means that differs from the first means and includes normalizing the waveform, and a calculation control unit () configured to cause the second calculation unit to calculate the respiration rate or the heart rate when an amplitude of the waveform is a threshold value or less.

Biological information monitoring system, bed system, and biological information monitoring method

An in-bed state monitoring system () for monitoring an in-bed state of a subject on a bed includes: four load detectors () which are configured to be placed at four corners of the bed to detect a load of the subject; and an edge sitting posture determining unit () configured to predict that the subject is reaching a state of edge sitting posture based on a change in a magnitude relation between detection values from two load detectors, which are of the four load detectors and are placed to interpose the bed between the two load detectors in a diagonal direction of the bed.

On-bed state monitoring system

There is provided a biological state monitoring system for monitoring biological state of subject on a bed. The system includes at least one load detector and a controller. In a case that the controller determines that body motion is not twitch, the controller ceases to output estimated value of respiratory rate, or outputs first estimated value which is the latest among estimated values obtained in first period, the first period being directly preceding body motion and being determined by the controller to be a period in which subject has no body motion. In a case that the controller determines that body motion is twitch, the controller successively outputs newly obtained estimated values of respiratory rate.

Biological state monitoring system

A motor drive controller includes: a phase current detection circuit including: an RC network circuit in which a resistor and a capacitor are connected in series, the RC network circuit being configured to be connected in parallel with one or more coils of each phase of a motor; and a filter circuit that smooths a signal based on a voltage signal across the capacitor, wherein the phase current detection circuit generates a DC voltage signal that corresponds to a change in a value of a phase current flowing in the coils; a motor driver that drives the motor by applying a voltage to each phase of the motor; and a controller that receives the DC voltage signal from the phase current detection circuit and controls the motor driver based on the DC voltage signal.

Motor drive controller

There is provided a water leakage detection device including a water leakage detection unit which is configured to detect water leakage, a water leakage detection circuit unit which is configured to be driven by a DC voltage from a DC power source and apply an AC voltage for detecting water leakage to the water leakage detection unit, and is configured to determine whether water is leaking based on a detection signal of the water leakage detection unit. The water leakage detection unit includes an insulating transformer having a primary side and a secondary side, the second side being connected to the water leakage detection unit, and a water leakage detection determining unit which is connected to the primary side of the insulating transformer.

Water leakage detection device

There is provided a load driving apparatus including: a power converter circuit configured to convert electric power into direct current power; an output electric current detecting circuit configured to detect an output current flowing in the load; and a control circuit section configured to switch ON/OFF-operations of the load depending on an operation instruction information, to perform constant current control during a period of the ON-operation of the load, to output a first pulse signal to the power converter circuit when starting the constant current control, ON-duty of the first pulse signal being substantially same as that during a period of a most recent operation of the load performed immediately before, to perform constant voltage control during a period of the OFF-operation of the load based on an output voltage applied to the load, and to output a second pulse signal to the power converter circuit.

Load driving apparatus and controlling method therefor

There is provided switching power unit comprising: a PFC voltage detector that detects PFC voltages of the power-factor improvement unit; an output voltage detector that is provided in a current resonance converter unit; a switching controller into which output signals from the PFC voltage detector and output signals from the output voltage detector are input, wherein the switching controller in a full-bridge circuit of first to fourth switching elements, based on output signals from the PFC voltage detector and the output voltage detector, controls the PFC voltages by changing on-duty of the first and second switching elements, and also controls the output voltages by changing switching frequencies of the full-bridge circuit.

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Fukuroi, Japan

Shigemi Masuda