A power conversion unit may include two or more power modules for providing high-voltage direct current power to electrical loads, such as one or more propulsion motors aboard an aerial vehicle. Each of the power modules may be controlled by hysteresis, and may include one or more pairs of transistors that are switched by a gate driver with respect to differences between a reference current and a sensed current passing through a boost inductor. The number, size and shape of the power modules may be selected to accommodate the electrical loads, and may be switched on or off, as necessary. The power conversion unit may feature at least one more power module than is required to meet all anticipated electrical loads, thereby ensuring that the power conversion unit may continue to provide power even in the event that one of the power modules experiences a fault of any kind.

A power conversion unit may include two or more power modules for providing high-voltage direct current power to electrical loads, such as one or more propulsion motors aboard an aerial vehicle. Each of the power modules may be controlled by hysteresis, and may include one or more pairs of transistors that are switched by a gate driver with respect to differences between a reference current and a sensed current passing through a boost inductor. The number, size and shape of the power modules may be selected to accommodate the electrical loads, and may be switched on or off, as necessary. The power conversion unit may feature at least one more power module than is required to meet all anticipated electrical loads, thereby ensuring that the power conversion unit may continue to provide power even in the event that one of the power modules experiences a fault of any kind.

A motor controller configured to reduce the motor noise by detecting the zero point of the motor current is disclosed. The motor controller comprises a switch circuit, a pre-driver, a phase detecting unit, a control unit, a comparator, a first resistor, and a second resistor. The switch circuit is an H-bridge circuit. The switch circuit includes a first upper-side switch, a second upper-side switch, a first lower-side switch, and a second lower-side switch. When the motor controller performs the last pulse width modulation driving with respect to the first lower-side switch before phase switching, the second upper-side switch is turned off and the first lower-side switch is kept turning on, so as to facilitate the detection of the zero point of the motor current.

A motor controller configured to reduce the motor noise by detecting the zero point of the motor current is disclosed. The motor controller comprises a switch circuit, a pre-driver, a phase detecting unit, a control unit, a comparator, a first resistor, and a second resistor. The switch circuit is an H-bridge circuit. The switch circuit includes a first upper-side switch, a second upper-side switch, a first lower-side switch, and a second lower-side switch. When the motor controller performs the last pulse width modulation driving with respect to the first lower-side switch before phase switching, the second upper-side switch is turned off and the first lower-side switch is kept turning on, so as to facilitate the detection of the zero point of the motor current.

A power supply controller works to control electrical power supplied to a surroundings monitor including an in-vehicle camera and an image processor which monitors surroundings of a vehicle using an output from the in-vehicle camera. The power supply controller includes a voltage monitor which determines whether an operating voltage for the image processor lies in a normal voltage range and an abnormal voltage range. Until a given threshold changing condition is met after start of power supply to the surroundings monitor, the voltage monitor alters at least one of an upper limit threshold and a lower limit threshold of the normal voltage range to decrease a difference between the upper and lower limit thresholds to be lower than that after the given threshold changing condition is satisfied. This ensures the stability in supplying electrical power to the surroundings monitor without restricting an operation of the surroundings monitor more than required.

A power supply controller works to control electrical power supplied to a surroundings monitor including an in-vehicle camera and an image processor which monitors surroundings of a vehicle using an output from the in-vehicle camera. The power supply controller includes a voltage monitor which determines whether an operating voltage for the image processor lies in a normal voltage range and an abnormal voltage range. Until a given threshold changing condition is met after start of power supply to the surroundings monitor, the voltage monitor alters at least one of an upper limit threshold and a lower limit threshold of the normal voltage range to decrease a difference between the upper and lower limit thresholds to be lower than that after the given threshold changing condition is satisfied. This ensures the stability in supplying electrical power to the surroundings monitor without restricting an operation of the surroundings monitor more than required.

A motor winding pattern is provided. In a driving system in which a first inverter and a second inverter are connected to a drive motor, and one end of a stator winding through which a three phase currents flow is connected to an output line of the first inverter, and the other end of the stator winding is connected to an output line of the second inverter, coils to which three phase currents are applied are wound on slots defined in a stator of the drive motor, and coils to which alternating current phases different from each other are applied are wound inside and outside each of all the slots defined in the stator on the basis of direction toward a rotation axis of the drive motor.

Method (100) for controlling a drive arrangement (200) for an automatic door operator (30) of an entrance system (10) having one or more movable door members (D1 . . . Dm), whereby the automatic door operator (30) is for causing movements of the one or more movable door members (D1 . . . Dm) between a closed position and an opened position, respectively. The drive arrangement (200) comprises a DC-motor (34) for driving the automatic door operator (30), a H-bridge (96) and a controller (32, 232) for controlling the drive arrangement (200). The H-bridge (96) comprises a first leg (A) and a second leg (B), the first leg (A) and second leg (B) both being connected to a first voltage supply line (97) and a second voltage supply line (98), the first voltage supply line (97) having a higher voltage than the second voltage supply line (98).

A power supply controller works to control electrical power supplied to a surroundings monitor including an in-vehicle camera and an image processor which monitors surroundings of a vehicle using an output from the in-vehicle camera. The power supply controller includes a voltage monitor which determines whether an operating voltage for the image processor lies in a normal voltage range and an abnormal voltage range. Until a given threshold changing condition is met after start of power supply to the surroundings monitor, the voltage monitor alters at least one of an upper limit threshold and a lower limit threshold of the normal voltage range to decrease a difference between the upper and lower limit thresholds to be lower than that after the given threshold changing condition is satisfied. This ensures the stability in supplying electrical power to the surroundings monitor without restricting an operation of the surroundings monitor more than required.

A power supply controller works to control electrical power supplied to a surroundings monitor including an in-vehicle camera and an image processor which monitors surroundings of a vehicle using an output from the in-vehicle camera. The power supply controller includes a voltage monitor which determines whether an operating voltage for the image processor lies in a normal voltage range and an abnormal voltage range. Until a given threshold changing condition is met after start of power supply to the surroundings monitor, the voltage monitor alters at least one of an upper limit threshold and a lower limit threshold of the normal voltage range to decrease a difference between the upper and lower limit thresholds to be lower than that after the given threshold changing condition is satisfied. This ensures the stability in supplying electrical power to the surroundings monitor without restricting an operation of the surroundings monitor more than required.