Abstract: An apparatus including an energy storage device and a power processing unit that is coupled to the energy storage device. The energy storage device is configured to deliver electrical energy to a load. The energy storage device also is configured to receive electrical energy from a source. The power processing unit is configured to control a fluctuation in voltage across the energy storage device while electrical energy is received by the energy storage device, or while electrical energy is delivered from the energy storage device to the load.

Abstract: An apparatus including an energy storage device and a power processing unit that is coupled to the energy storage device. The energy storage device is configured to deliver electrical energy to a load. The energy storage device also is configured to receive electrical energy from a source. The power processing unit is configured to control a fluctuation in voltage across the energy storage device while electrical energy is received by the energy storage device, or while electrical energy is delivered from the energy storage device to the load.

Abstract: An apparatus including an energy storage device and a power processing unit that is coupled to the energy storage device. The energy storage device is configured to deliver electrical energy to a load. The energy storage device also is configured to receive electrical energy from a source. The power processing unit is configured to control a fluctuation in voltage across the energy storage device while electrical energy is received by the energy storage device, or while electrical energy is delivered from the energy storage device to the load.

Abstract: An apparatus including an energy storage device and a power processing unit that is coupled to the energy storage device. The energy storage device is configured to deliver electrical energy to a load. The energy storage device also is configured to receive electrical energy from a source. The power processing unit is configured to control a fluctuation in voltage across the energy storage device while electrical energy is received by the energy storage device, or while electrical energy is delivered from the energy storage device to the load.

Abstract: An apparatus and method for controlling a range of movement of a power piston coupled to an alternator in a linear-motion engine. The apparatus includes a power bridge and a bridge controller. The power bridge is coupled to the alternator and is used to adjust a voltage output from the alternator. The bridge controller is coupled to the power bridge and the alternator and is used to compare the voltage output from the alternator to a reference voltage that corresponds to a desired range of movement of the power piston, and generate a plurality of control signals used to control the operation of the power bridge.

Abstract: An apparatus and method for controlling a range of movement of a power piston coupled to an alternator in a linear-motion engine. The apparatus includes a power bridge and a bridge controller. The power bridge is coupled to the alternator and is used to adjust a voltage output from the alternator. The bridge controller is coupled to the power bridge and the alternator and is used to compare the voltage output from the alternator to a reference voltage that corresponds to a desired range of movement of the power piston, and generate a plurality of control signals used to control the operation of the power bridge.

Abstract: A four quadrant unipolar pulse width modulated (PWM) power conversion circuit for supplying a desired current to an inductive load uses an H-bridge circuit topology with an upper and lower pair of switching elements including a diode in parallel with each of the switching elements to provide a current path from the load to the power source when its respective switching element is non-conductive. A control algorithm generates switching element control signals to cause the instantaneous voltage across the load to alternate between a single polarity voltage and zero for a portion of the output load waveform to cause the average value of the load current to correspond generally with the desired average load current.