Abstract:
A power supply device for inverting power to be supplied to a motor and a method of controlling the power supply device. The power supply device includes an inrush protection (IP) circuit, a power factor correction (PFC) circuit and an overvoltage protection (OP) circuit. A controller and a pair of relays selectively connect predetermined components so that at least one component is selectively changed from operation in one of the IP, PFC and OP circuits to operation in another of the IP, PFC and OP circuits in response to a detected value of an inverter input voltage. The inrush protection circuit operates in a start up mode; the PFC circuit operates while normally driving the motor; and the overvoltage protection circuit operates where the inverter input voltage increases due to regeneration by the motor.
Abstract:
Integrated power conversion systems and methods for use in an electric vehicle having an electric motor, a primary high-voltage energy source, and an auxiliary energy source including a traction inverter module operable for converting a DC current generated by the high-voltage energy source into an AC current capable of powering the electric motor, and a DC/DC converter operable to step-down a voltage of the high-voltage energy source or step-up a voltage of the auxiliary energy source, wherein the traction inverter module and the DC/DC converter may share one or more common components, such as a common high-voltage DC bus capacitor, a common DC bus bar, and/or a common high-voltage transistor.
Abstract:
A power control apparatus for controlling power supplied to an electric motor rotating a rotor employed in a centrifuge is provided. The power control apparatus includes first and second inverters and a smoothing capacitor disposed between the first and second inverters. In a motor power mode, the first inverter charges the smoothing capacitor with power supplied by an AC power supply, while the second inverter charges, in a motor braking mode, the smoothing capacitor with power regenerated by the motor during a braking operation for returning the regenerated power back to the AC power supply through the first inverter. An reactor is arranged between the AC power supply and the first inverter for reducing harmonic components contained in the current supplied from or back to the AC power supply.
Abstract:
An ac electric drive system includes a bidirectional power semiconductor interface between a battery, or an auxiliary energy storage device, and a power inverter for boosting an input dc voltage and for decoupling the dc link voltage from the input dc voltage such that the dc link voltage is substantially independent of the input dc voltage and the parameters of the battery or energy storage device. The input dc voltage is controlled to maximize efficiency along predetermined torque envelopes.
Abstract:
In a method of and apparatus for connecting a storage battery to an elevator inverter, the storage battery being connected to a d.c. circuit of the elevator inverter power stage, a voltage in the d.c. circuit is higher than the battery voltage. Power flows bidirectionally from the storage battery to the d.c. circuit and vice versa. When power is flowing from the storage battery to the d.c. circuit, the battery voltage is matched to the voltage in the d.c. circuit by the aid of a semiconductor switch, by means of which an energy store is charged, and a diode, by which the energy in the energy store is discharged into the d.c. circuit. When power is flowing from the d.c. circuit to the storage battery, the voltage of the d.c. circuit is matched to the battery voltage with the aid of a second semiconductor switch, by means of which the energy store is charged, and a second diode, by which the energy in the energy store is discharged into the storage battery.
Abstract:
A tachometer is coupled to the rotor of an A.C. motor and generates an output voltage proportional to the rotor's speed. A VELOCITY COMMAND voltage is generated having an amplitude which specifies a desired rotor speed. The tachometer voltage is subtracted from the VELOCITY COMMAND voltage to produce a VELOCITY ERROR voltage. The output of a D.C. power source is chopped at a fixed frequency and variable pulse width, the pulse width being proportional at any time to the amplitude of the VELOCITY ERROR voltage. The chopped D.C. voltage is filtered to provide a variable D.C. voltage having an amplitude which is proportional to the amplitude of the VELOCITY ERROR voltage. The variable D.C. voltage is applied to an inverter which changes it into an A.C. voltage. The A.C. voltage is applied to the stator windings of the motor to drive the rotor thereof. The frequency of the A.C. voltage is variable and is proportional, at rotor speeds above 150 RPM, to the amplitude of the velocity command voltage. At rotor speeds below 150 RPM, the frequency of the A.C. voltage is held fixed at approximately 28 Hz. The amplitude of the A.C. voltage is proportional to the VELOCITY ERROR voltage at all speeds. The frequency of the A.C. voltage is determined by an oscillator which drives a ring counter whose counting direction is controlled by a direction flip-flop. The state of the direction flip-flop is changed whenever the polarity of the VELOCITY ERROR voltage changes so that deceleration of the motor always occurs in a plugging mode.
Abstract:
An AC motor is energized by the output voltage of an inverter which in turn receives a DC input voltage from a DC-to-DC converter. A combined oscillator-regulator circuit includes a first potentiometer for adjusting the desired volts/hertz ratio of the inverter output voltage, and a second potentiometer for regulating motor speed. The combined oscillator-regulator receives an output signal from the inverter for comparison against the desired volts/hertz ratio signal, and provides two control signals. The first control signal regulates the operation of the DC-to-DC converter, and the second control signal regulates the frequency of the inverter output voltage.
Abstract:
A power supply circuit in an inverter for driving an electrical machine has a high-voltage branch with a high-voltage level and a low-voltage branch with a low-voltage level, the high-voltage level being higher than the low-voltage level, the high-voltage branch being connected to the low-voltage branch via an operating DC/DC converter, the low-voltage branch having a supply branch and a mains branch, the high-voltage branch being connected to the mains branch via a discharge DC/DC converter. A method for operating the power supply circuit includes, in a first operating mode conducting current from the high-voltage branch via the operating DC/DC converter into the supply branch, and in a second operating mode, conducting current from the high-voltage branch via the discharge DC/DC converter into the mains branch.
Abstract:
When an accelerator is turned on in a braking state in which the accelerator is turned off during predetermined traveling and a braking torque is output from a first motor to a drive shaft via a planetary gear set with negative rotation of the first motor and with a counter electromotive voltage of the first motor higher than a voltage of power lines on a high voltage side, a step-up and step-down converter and an engine are controlled such that a voltage of the power lines on the high voltage side increases and a rotation speed of the first motor increases in comparison with a case in which the accelerator is turned off.
Abstract:
Embodiments of an integrated motor drive power electronics system are generally described herein. In some embodiments, the integrated motor drive power electronics system includes an active line filter (ALF) configured to control and regulate current drawn from an input power source and to attenuate current ripple fed back to the input power source, an energy storage capacitance coupled to an output of the active line filter, and a bidirectional low voltage power supply (LVPS). In some embodiments, the bidirectional LVPS may provide regulated power to a load and may selectively recycle power back to the input power source and regulate voltage at the load to a predetermined output voltage. In some embodiments, the energy storage capacitance may serve as a local input power source for higher power motor drive electronics and the bidirectional LVPS.