摘要:
A power supply apparatus for providing electrical power to a power consuming device or a power conversion device from at least one of a first AC power source and a second AC power source. The power supply apparatus comprises controllable rectifier devices associated with each of the first and second AC power sources. The controllable rectifier devices are controllable to simultaneously rectify and control the power provided by the first and second AC power sources.
摘要:
An apparatus for an alpha trim adjustment includes a phase delay circuit that creates a phase delay for a gate signal for a switching cycle. The gate signal is for a phase of a three-phase, phase shifted alternating current (“AC”) input of a multi-pulse motor drive powering a direct current (“DC”) motor. The apparatus includes an alpha trim circuit that modifies the phase delay with an alpha trim adjustment to create an adjusted phase delay for the switching cycle, a delay application circuit that applies the adjusted phase delay to the gate signal.
摘要:
A PWM modulation circuit controls low-side transistors of three phases (u, v, and w) all to be into an ON state, when a brake current flows, controls, in a period in which a brake current flows in one phase, a transistor for sensing (u, v, and w) of this one phase to be into an ON state, and controls, in a period of two phases, the transistor for sensing (u, v, and w) of three phases to be into an OFF state. When the brake current is to flow, sense-phase control circuits of three phases controls a transistor for sensing (u, v, and w), in a phase in which the brake current is in a sink direction, to be into an ON state, and controls the transistor for sensing (u, v, and w) in a phase in which it is in an opposite direction, to be into an OFF state.
摘要:
In a method and corresponding circuitry for controlling a rectifier circuit having a controlled rectifier, the controlled rectifier is fired at an electrical angle Alpha and is quenched at an electrical angle Beta . A circuit arrangement is provided for establishing a quenching period during which quenching of the controlled rectifier occurs. This quenching period begins at an electrical angle after the A.C. supply current has reached its maximum value and ends prior to the electrical angle at which the A.C. supply voltage subsequently crosses through zero. The controlled rectifier is quenched at an angle Beta lying within the quenching period and having a value which is adjustable in dependence on a momentary value of the A.C. supply current.
摘要:
In a series-wound motor speed control system comprising a solid state controlled rectifier connected in series with the motor and a source of pulsating rectified current, the rectifier is controlled by a synchronized unijunction transistor triggering pulse former including an RC timing network. The time position of the triggering pulses is subject to a threefold control, namely, a manual control, by varying the resistance of the network, to adjust the motor speed, a first automatic control in dependence upon variations of the motor load, and a second automatic control depending upon supply voltage variations, to maintain the adjusted motor speed constant independently of said variations.
摘要:
A configurable voltage regulating circuit includes first through fourth switches. A flying capacitor is coupled between a common mode node and a pump node, and a sense resistance network is coupled between an output node and an input of an error amplifier and configured to provide a sensed output voltage. The error amplifier receives at another input a reference voltage and generates an error signal. A charging circuit supplies a charging current to the pump node, and controls the value of the charging current as a function of the error signal. A switch command signals generator generates respective first, second, third, and fourth switch signals to control the first switch, second switch, third switch, and fourth switch. The generator sets the configurable voltage regulating circuit as either a charge pump or a linear regulator based the input voltage being less than a first threshold or greater than a second threshold.
摘要:
The control method for an electric vehicle sets a motor torque command value based on vehicle information and controls torque of a first motor connected to a first drive wheel which is one of a front drive wheel and a rear drive wheel. The control method for an electric vehicle calculates a first torque command value by a feedforward computation based on the motor torque command value, detects a rotation angular velocity of the first motor, and estimates a rotation angular velocity of the first motor based on the first torque command value by using a vehicle model Gp(s) that simulates a transfer characteristic from a torque input to the first drive wheel to a rotation angular velocity of the first motor.
摘要:
A method and device for elevator DC drive motor speed control stabilization system in which current data and speed data are used as feed-back information. The current regulator is approximated by an ideal integrator, and mathematical model thereby obtained is used for determining the amplification and time constants of the control system speed loop or loops, and these system parameters are compensated by providing short instruction accentuations for achieving practically delay-free compliance with instructions.