REGENERATIVE BRAKING SYSTEM
First Claim
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1. A circuit to deliver electrical energy from a voltage source to an AC mains connection, the voltage source having a voltage, the circuit comprising:
- a switchable device between the voltage source and the AC mains connection, the switch configured to transfer current from the voltage source to the AC mains;
an edge detector configured to produce a sync signal corresponding to zero-crossing points of the AC mains; and
control circuitry coupled to the edge detector, to the voltage source, and to the switchable device, the control circuitry configured to generate a rectified sine signal synchronized with the sync signal, to determine an error based on the difference between the voltage and a reference voltage, and to deliver a current drive signal to the switch, the current drive signal proportional to the product of the error 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.
22 Citations
17 Claims
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1. A circuit to deliver electrical energy from a voltage source to an AC mains connection, the voltage source having a voltage, the circuit comprising:
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a switchable device between the voltage source and the AC mains connection, the switch configured to transfer current from the voltage source to the AC mains; an edge detector configured to produce a sync signal corresponding to zero-crossing points of the AC mains; and control circuitry coupled to the edge detector, to the voltage source, and to the switchable device, the control circuitry configured to generate a rectified sine signal synchronized with the sync signal, to determine an error based on the difference between the voltage and a reference voltage, and to deliver a current drive signal to the switch, the current drive signal proportional to the product of the error and the rectified sine signal.
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2. 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 generates 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 (3, 4, 5, 6, 7)
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8. A centrifuge with a rotor having a regenerative braking function that delivers electrical energy to an AC mains, the centrifuge comprising:
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a circuit that delivers a voltage to a capacitor during deceleration of the rotor; an edge detector configured to produce a sync signal corresponding to the zero-crossing points of the AC mains; a switchable device coupling the capacitor to the AC mains connection; and a controller coupled to the edge detector, to the capacitor, and to the switchable device, the controller configured to generate a rectified sine signal synchronized with the sync signal, to generate an error signal related to the difference between the voltage and a reference voltage, and to deliver a current drive signal to the switchable device, the current drive signal proportional to the product of the error signal and the rectified sine signal.
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9. 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 generating a 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 (10, 11, 12, 13, 14, 15, 16)
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17. -23. (canceled)
Specification