Abstract:
A power converter (500) for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor including first and second partial circuits (553, 554) for forming multiple conduction circuits in cooperation with first and second phase windings (505, 508) of the motor. The contoller (704) also includes a switch (555) operable to open and close a first conduction circuit, which includes the first phase winding (551), and to regulate energization of the first and second phase windings of the motor through opening and closing the first conduction circuit. Control of the switch (555) provides four-quadrant operation of the motor through regulated energization of the first and second phase windings (551, 552).
Abstract:
A method for identifying an operational phase of a motor (203) may include obtaining a first value of a signal that is indicative of the operational phase of the motor (203) and obtaining a second value of the signal after a period of time has expired. The method further includes identifying a first operational phase of the motor (203) if the second value exceeds the first value by a non-negative first threshold value. A second operational phase of the motor (203) is identified if the second value does not exceed the first value by the first threshold value. The first and second operational phases may correspond to relative positions of a motor's rotor and stator, such that periods of energization may be identified for producing motoring or regenerative torque.
Abstract:
A circuit that increases input voltage to higher output voltage connected to a drive. The circuit can include a power input that receives the input voltage from a power source and at least one capacitor bank connected with the power input. A current-limiting surge suppressor is positioned between the power input and the at least one capacitor bank. The current-limiting surge suppressor includes a first current-limiting path and a second bypass path. A drain, when operable, dissipates the charge of the at least one capacitor bank. The drive is operable in response to the higher voltage output from the at least one capacitor bank.
Abstract:
Systems and methods are provided for a soft switching topology for a direct current (DC)-DC converter. The systems and methods determine an operational status of an electric motor, and activate at least one of an upper or lower first or second semiconductor switches based on an operation of the electric motor. The first and second switching circuits are conductively coupled to a power inverter circuit. The systems and methods include deliver an adjusted voltage to one of the power inverter circuit or a power circuit based on the operational status of the electric motor.
Abstract:
A boost converter device includes a first boost converter, a second boost converter, and a first electronic control unit. The first electronic control unit being configured to control switching of a first upper arm based on a first pulse width modulation signal and to control switching of a first lower arm based on a first inverted signal acquired by inverting the first pulse width modulation signal. The first electronic control unit is configured to control switching of a second lower arm based on a second pulse width modulation signal and to control switching of a second upper arm based on a second inverted signal acquired by inverting the second pulse width modulation signal.
Abstract:
A discharge switch and a capacitor are connected in series between first and second DC power supply lines. A boost circuit boosts a rectified voltage to charge the capacitor. An inverter receives the rectified voltage as a DC voltage when the discharge switch is not conducting, receives a voltage across the capacitor as the DC voltage when the discharge switch is conducting, converts the DC voltage into an AC voltage, and outputs it to a motor. A switch control unit maintains the discharge switch not conducting over a first time period, and switches the discharge switch between conducting and not conducting in a second time period. A charge and discharge time period setting unit sets the first time period when a rotational speed of the motor is higher than a speed threshold shorter than the first time period when the rotational speed is lower than the speed threshold.
Abstract:
The power source is a battery (bank) is connected to a DC to AC power inverter. The DC to AC power inverter power and electric motor. The electric motor's rotor is connected to the rotor of an alternator with and alternator belt. The alternator is connected to the power source charged at full capacity at all time. The battery bank is then connected to a 2nd 24,000 watt DC to AC power inverter. The power inverters out-put is connected to a transformer for filtering and wave shaping. The transformers is connected to the circuits in the home or industry.
Abstract:
In a boost chopper circuit, a backflow prevention diode circuit has a withstand voltage equal to or more than a withstand voltage of a capacitor circuit connected in series to the backflow prevention diode circuit between opposite ends of a switching device circuit.
Abstract:
A motor drive control apparatus according to the present invention includes: a three-phase rectifier to rectify an AC voltage supplied from a three-phase AC source; a booster circuit including a reactor, a switching element, and a backflow preventing element, to boost a DC bus voltage supplied from the three-phase rectifier; a smoothing capacitor to smooth an output of the booster circuit; and an inverter circuit to convert the DC bus voltage smoothed by the smoothing capacitor into an AC voltage and supplying the AC voltage to a motor. During a starting operation of a boosting operation of the booster circuit or a stopping operation of the boosting operation thereof, a rotation speed of the motor is fixed.
Abstract:
A first reactor is provided on the input side of a rectifying circuit that rectifies AC power (on the side of an AC power supply), and on the output side of the rectifying circuit (on the side of a load), first and second capacitors that are connected in series to each other, and first and second switching elements that switch between charging and not charging of the first and second capacitors, respectively, are provided, a second capacitor group in Y-connection, provided with three capacitors, each of which is connected to each phase-terminal of the first reactor on the side of the rectifying circuit, is connected to the midpoint of the first and second switching elements, and the output voltage to the load is boosted, while the on-duty of the first switching element and the on-duty of the second switching element are controlled to be equal to each other.