Continuous power source with bi-directional converter

Patent · Tue Jul 07 00:00:00 EDT 1981

OSTI ID:5777072

Small, K T

A power source provides continuous ac power by employing a bidirectional converter which interfaces a rechargable dc power storage device with ac mains power and ac loads. The bidirectional converter includes a transformer having first and second windings coupled in reverse polarity through dual switching means in parallel with one another. The switching means are coupled to a state controller responsive to conditions at the ac mains terminal, the ac load terminal and the dc power terminal. There are two general operating conditions, an active condition wherein dc power is provided to the ac load, and a standby condition wherein power is recovered by the dc storage device. In the standby condition, the converter operates in a socalled ''flyback'' mode to recover power and to direct it to the dc storage device. In the active condition, the converter is pulse-width modulated according to a predetermined duty cycle to produce an ac sine wave output at the ac load terminals. Where the ac load includes reactive components, the converter operates to recover unused power from the load and to transfer power back to the dc power source whenever the polarity of the output voltage differs from the polarity of the output current.

• Assignee: Tab Products Co
• Patent Number(s): US 4277692
• OSTI ID: 5777072
• Resource Relation: Patent File Date: Filed date 4 Jun 1979
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
INVERTERS
DESIGN
POWER SYSTEMS
ALTERNATING CURRENT
DIRECT CURRENT
EQUIPMENT
MODULATION
MONITORING
PULSES
TRANSFORMERS
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
200301* - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)
200302 - Power Transmission & Distribution- DC Systems- (1989-)