Bi-lateral four quadrant power converter
AssigneeGTE Automatic Electric Labs Inc.
InventorsJames S. Butcher, Andrew Chan, Paul U. Lind
Life of this patent
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Abstract
A power converter which supplies AC or positive or negative DC output voltage with positive or negative current while isolating the output voltage from the input power source. This converter includes a pulse width modulator converts power amplitude signals to pulses of proportionate width. A power driver circuit applies these pulses to a sychronous demodulator and low pass filter via a pulse transformer. A low output impedance is presented to all output disturbances such that the converter can source or sink current in true four quadrant operation, including the passing of power from output to input when a load voltage exceeds the intended supply voltage.
Claims13
A power converter for use in a power supply system including a variable electrical load and a power control circuit operated to provide positive and negative polarity signals and a plurality of power amplitude data signals, said power converter comprising:
- pulse width modulation means connected to said power control circuit, operated in response to said power amplitude data signals to periodically provide a pulse width modulated signal having a pulse width proportional to the amplitude defined by said power amplitude data signals;
- voltage control means connected to said pulse width modulation means, operated in response to said pulse width modulated signal and said positive polarity signal to provide a positive output voltage signal, and further operated in response to said pulse width modulated signal and said negative polarity signal to provide a negative output voltage signal;
- and
- filter means connected to said voltage control means, operated to provide an averaged positive output voltage of a magnitude proportional to the average pulse width of said positive output voltage signal and further operated to provide an averaged negative output voltage of a magnitude proportional to the average pulse width of said negative voltage signal;
- said load operated in response to a load voltage less than said averaged positive output voltage to sink current from said voltage control means;
- said voltage control means operated in response to a load voltage greater than said averaged positive output voltage to sink current from said load;
- said load further operated in response to a load voltage less than said averaged negative output voltage to sink current from said voltage control means;
- and
- said voltage control means further operated in response to a load voltage greater than said averaged negative output voltage to sink current from said load.
Dependencies are inferred from the claim text.