A first and a second full-wave rectifying network are respectively connected with both ends of phase coils of a current generator for respectively generating alternating current thereat. A first and a second additional diode are respectively connected between both positive and negative direct current terminals of the first and second full-wave rectifying network. A switching device has normally closed contacts connected across the positive and negative terminals of the second full-wave rectifying network, whereby the phase coils act as a star-connected current generating winding so long as the contacts are held closed. The switching device also has an energizing coil for actuating the normally-closed contacts to open by the electromotive force thereof when the rotational speed of the generator exceeds a predetermined value. When the normally-closed contacts are opened, the phase coils no longer act as the star-connected winding but as independently generating windings, to thereby increasing the output current from the generator even when the generator operates at a relatively high rotational speed.
A first and a second full-wave rectifying network are respectively connected with both ends of generating coils of a generator for respectively generating alternating current thereat. A switching device has normally closed contacts for making voltage differences among the input terminals of the second full-wave rectifying network zero, whereby the coils act as a star-connected current generating winding so long as the contacts are held closed. The switching device also has an energizing coil for actuating the normally-closed contacts to open when the rotational speed of the generator exceeds a predetermined value. When the normally-closed contacts are opened, the coils no longer act as the star-connected winding but an independently generating winding, to thereby increase the output current from the generator even when the generator operates at a relatively high rotational speed. A terminal circuit having a resistor and diodes connected with input terminals of the first full-wave rectifying network supplies base current for a switching transistor of a voltage regulator so that the voltage regulator establishes a separate field excitation at an earlier stage of the rotational speed of the generator.
A monitoring circuit for an electrical generator for recharging a motor vehicle battery. The monitoring circuit includes a driver transistor, a field coil current sensor, and driver circuit. The collector-emitter path of the driver transistor is connected in series to the field coil of the generator and a direct current voltage source. The field coil current sensor provides a signal indicative of the current flowing in the field coil. The driver circuit drives the transistor as a function of the voltage produced by the generator and the signal provided by the field coil current sensor. The driver circuit includes a detector circuit and a processing and comparison circuit. The detector circuit is connected to a phase of the generator and provides a signal indicative of the generator's rotation speed. The processing and comparison circuit is coupled to the detector circuit and generates a signal for controlling the conduction of current through the transistor so that the intensity of the current flowing through the collector-emitter path of the transistor varies as a function of the generator's rotation speed.
A generator/motor system and a method for operating this generator/motor system with which the filter currents are reduced. The generator/motor system has, for this purpose, a rotational field machine (DM) and a pulse-controlled inverter and filter capacitors (C1, C2). The pulse-controlled inverter is formed by two identical pulse-controlled inverters (PWR1, PWR2) which each have half the rated power. During operation, depending on the necessary rotational speed switching over is performed between a star circuit in which only the first pulse-controlled inverter is operational, and a single phase circuit in which both pulse-controlled inverters are operational. In order to obtain a torque which is comparable to the prior art, even if only one of the two pulse-controlled inverters is used, the rotational field machine has approximately twice the number of stator turns.
The present invention relates to a circuit for producing electricity, the circuit comprising: a first rectifier comprising inputs and an output; a second rectifier comprising inputs and an output, the inputs of the first and second rectifiers being for connection to an alternator so that phases of the alternator are connected in series with the inputs of the first and second rectifiers; at least one switch for short-circuiting the output of the second rectifier or at least a part of the inputs of the second rectifier; and a control unit for controlling the switching of the at least one switch so as to regulate the rectified voltage delivered by the circuit.
A method and apparatus for controlling AC power from the stator of an alternator in which groups of windings have various numbers of turns and various numbers of poles per winding can be connected in series to achieve optimum power generation at one RPM and in parallel to achieve optimum power generation at another RPM.
