A motor control device for a motor includes: an inverter circuit supplying power of a battery to the motor; an inverter input voltage detector detecting an inverter input voltage; and a controller including a drive controller for the motor and an abnormality determination unit for determining power feeding abnormality. The abnormality determination unit determines the power feeding abnormality when the inverter input voltage is lower than a voltage threshold and a current from the battery to the inverter circuit is in a determinable range. The abnormality determination unit determines, based on a motor current electrically conducted to the motor or a rotational speed of the motor, whether the current is in the determinable range. A determination threshold in accordance with the determinable range is set that the inverter input voltage is equal to or higher than the voltage threshold when the power feeding region is normal.

A power tool system includes: a switch; a motor connected to the switch; a control module connected to the motor; a communication module of a power tool connected to the control module; a power supply module of the power tool connected to the control module; and a battery pack configured to supply power to the power supply module of the power tool. The battery pack comprises a communication module. The control module is configured to: receive a conduction signal of the switch; control the motor to operate according to the conduction signal; detect an operation time of the motor; control the communication module of the power tool and the communication module of the battery pack to establish communication therebetween, in response to the operation time being a first predetermined time, enabling the power tool to obtain a state of the battery pack.

This electric compressor control device comprises: a control unit of an inverter which controls a motor that drives a compressor; a physical quantity calculation unit which calculates, on the basis of one or a plurality of predetermined detection values acquired from the inverter, a physical quantity that varies depending on a workload of the compressor; a number-of-revolutions acquisition unit which acquires the number of revolutions of the motor; a storage unit which stores information representing a first threshold that varies depending on the number of revolutions of the motor, and defines whether or not the physical quantity is a normal value; and a refrigerant abnormality determination unit which determines whether or not there is an abnormality in a refrigerant system by comparing the calculated physical quantity with the first threshold, depending on the acquired number of revolutions.

A power module includes: a first substrate having an outer surface and an inner surface, the first substrate extending from a first longitudinal end toward a second longitudinal end; a semiconductor die coupled to the inner surface of the first substrate; and a second substrate having an outer surface and an inner surface, the semiconductor die being coupled to the inner surface of the second substrate, the second substrate extending from a first longitudinal end toward a second longitudinal end, wherein the first longitudinal end of the first substrate is longitudinally offset from the first longitudinal end of the second substrate.

A system includes an inverter including: a first galvanic isolator separating a low voltage area from a high voltage area, the first galvanic isolator having a first galvanic isolator output path; a second galvanic isolator having a second galvanic isolator output path; an amplifier connected to the first galvanic isolator via the first galvanic isolator output path, and connected to the second galvanic isolator via the second galvanic isolator output path, the amplifier having a first amplifier output path and a second amplifier output path; a comparator connected to the amplifier via the first amplifier output path and the second amplifier output path, the comparator having a first comparator output path and a second comparator output path; and a pulse reshape and envelope detector connected to the comparator via the first comparator output path and the second comparator output path.

A system comprises an inverter configured to convert DC power from a battery to AC power to drive a motor, wherein the inverter includes: a galvanic isolator separating a high voltage area from a low voltage area; a low voltage phase controller in the low voltage area, the low voltage phase controller configured to receive a clock reference signal; and a high voltage phase controller in the high voltage area, the high voltage phase controller configured to align a clock reference signal of the high voltage phase controller with the clock reference signal of the low voltage phase controller.

A power module includes: a first substrate having an outer surface and an inner surface, the first substrate extending from a first longitudinal end toward a second longitudinal end; a power switch including a semiconductor die, the power switch being coupled to the inner surface of the first substrate; a second substrate having an outer surface and an inner surface, the power switch being coupled to the inner surface of the second substrate, the second substrate extending from a first longitudinal end toward a second longitudinal end, wherein the first longitudinal end of the first substrate is longitudinally offset from the first longitudinal end of the second substrate; a first electrically conductive spacer coupled to inner surface of the first substrate and to the inner surface of the second substrate; and a flex circuit coupled to the power switch.

A system includes: an inverter configured to convert DC power from a battery to AC power to drive a motor, wherein the inverter includes: a galvanic interface configured to separate a high voltage area from a low voltage area, the galvanic interface including a command channel and a message channel; a low voltage controller in the low voltage area, the low voltage controller configured to receive a PWM signal from a PWM controller; and a high voltage controller in the high voltage area, the high voltage controller configured to receive a control signal from the low voltage controller using the command channel of the galvanic interface, and send a switch state signal to the low voltage controller using the command channel of the galvanic interface, wherein the low voltage controller is configured to control the control signal based on the PWM signal and the switch state signal.

A system includes an inverter configured to convert DC power from a battery to AC power to drive a motor, wherein the inverter includes: one or more controllers configured to provide a test signal to control a gate leakage detection operation, and a power module including: a phase switch including one or more phase power switches, and a point-of-use controller configured to detect a gate leakage of the phase switch based on the test signal.

A system includes: an inverter configured to convert DC power from a battery to AC power to drive a motor, wherein the inverter includes: a power switch including a drain terminal, a source terminal, and a gate terminal; and one or more controllers configured to: receive one or more signals related to an operation of the power switch, update one or more state definitions based on the received one or more signals, and control a gate control signal to the gate terminal based on the updated one or more state definitions.