Regenerative braking system
AssigneeBeckman Coulter, Inc.
InventorsJason L. Hessler, Ronald T. Keen
Life of this patent
Estimating the term…
Abstract
A circuit for delivering electrical energy to an AC mains connection is disclosed. The circuit includes a voltage source and a switch connected between the voltage source and the AC mains connection. The switch operates to transfer current from the voltage source to the AC mains. The circuit further includes a controller to control the switch. The controller operates to generate a simulated signal that represents a waveform of the AC mains without any distortion present on the waveform of the AC mains.
Claims16
A circuit to deliver electrical energy between a load and an AC mains, the circuit comprising:
- a switchable device coupling the load to the AC mains;
- and
- a controller including a synthesizer, a voltage control loop, and a current control loop,
- wherein the circuit is configured to transfer current from the AC mains to the load in a first operating mode and to transfer current from the load to the AC mains in a second operating mode, the load in the second operating mode producing a load voltage, and
- wherein the synthesizer synthesizes a rectified sine signal synchronized with the AC mains,
- wherein the voltage control loop generates a voltage signal as the difference between the load voltage and a reference voltage, and
- wherein the current control loop drives the switchable device in proportion to the product of the voltage signal and the rectified sine signal.
An inverter system of an instrument for transferring power between an AC mains and a load, the instrument having a normal mode of operation in which current is drawn from the AC mains to the load and a regenerative mode of operation in which current is transferred from the load to the AC mains, the load producing a load voltage in the regenerative mode of operation, the inverter system comprising:
- at least one inductor electrically coupled to the AC mains;
- a switching device electrically coupled between the at least one inductor and the load;
- and
- a controller comprising:
- a reference signal generator for synthesizing a simulated reference signal synchronized with a line voltage signal;
- a voltage control loop for generating an error voltage, the error voltage corresponding to an error between a load voltage and a reference voltage;
- and
- a current control loop for controlling the switching device based on the product of the reference signal and the error voltage.
Dependencies are inferred from the claim text.