Regenerative braking system
First Claim
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1. 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, andwherein 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, andwherein the current control loop drives the switchable device in proportion to the product of the voltage signal and the rectified sine signal.
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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.
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Citations
16 Claims
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1. A circuit to deliver electrical energy between a load and an AC mains, the circuit comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 15)
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7. 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:
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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. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 16)
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Specification