US3586960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control arrangement for single phase bridge converter
Assignee: Individual
•
Filing: 1969-03-11
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Granted: 1971-06-22
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Expires: 1989-03-11
Abstract
Abstract In an AC/DC or DC/AC electric converter using controllable rectifiers in the four arms of a single phase bridge arrangement, the firing angle, of the rectifiers in one pair of adjacent arms is controlled separately from that of the rectifiers in the other pair of adjacent arms to provide a reduction in harmonics and an improvement in the power factor.
Inventors
- 👤 Narain G Hingorani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:08
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
176 words
A control arrangement for a single-phase bridge converter comprising four arms, each of which includes a conductive controllable device having in effect an anode, a cathode and a control electrode, the arrangement being such that the firing angle of a pair of adjacent arms in which the device cathodes are commoned is controlled separately from the firing angle of the other pair of adjacent arms in which the device anodes are commoned, said arrangement including two amplifiers, each including a feedback path shunted by a diode, the output of the other amplifier controlling the firing angle of the other pair of arms and means for comparing at the input of each amplifier signals representative of the actual output of the converter against a set value, the set value output of the converter against a set value, the set value of one amplifier differing from the set value for the other amplifier by an amount which causes the output of the amplifier having the lower set value to swing from maximum permissible value to minimum permissible value.
Claim 2
Dependent Claim
176 words
A control arrangement for a single-phase bridge converter comprising four arms, each of which includes a conductive controllable device having in effect an anode, a cathode and a control electrode, the arrangement being such that the firing angle of a pair of adjacent arms in which the device cathodes are commoned is controlled separately from the firing angle of the other pair of adjacent arms in which the device anodes are commoned, said arrangement including two amplifiers, each including a feedback path shunted by a diode, the output of the other amplifier controlling the firing angle of the other pair of arms and means for comparing at the input of each amplifier signals representative of the actual output of the converter against a set value, the set value output of the converter against a set value, the set value of one amplifier differing from the set value for the other amplifier by an amount which causes the output of the amplifier having the lower set value to swing from maximum permissible value to minimum permissible value.
Claim 3
Dependent Claim
113 words
A control arrangement as claimed in claim 1, wherein the firing angle of one pair of arms is quiescent at a small value and is increased above this value when the output voltage is to be varied in one sense and when the firing angle of the other pair of arms is at or near its maximum permissible value, and wherein the firing angle of said other pair of arms is quiescent at a large value and is decreased from this value when the output voltage is to be varied in the other sense and when the firing angle of the first-mentioned pair of arms is at or near its minimum permissible value.
Claim 4
Dependent Claim
59 words
A control arrangement as claimed in claim 2, wherein the first-mentioned pair of arms have commoned anodes and increasing the firing angle thereof provides an increase in the output voltage in a positive direction, and the other pair of arms have commoned cathodes and decreasing the firing angle thereof provides a decrease in output voltage in the negative direction.
Claim 5
Dependent Claim
190 words
A control arrangement for a single-phase bridge converter comprising four arms, each of which includes a conductive controllable device having in effect an anode, a cathode and a control electrode, the arrangement being such that the firing angle of a pair of adjacent arms in which the device cathodes are commoned is controlled separately from the firing angle of the other pair of adjacent arms in which the device anodes are commoned, said arrangement including two amplifiers, each including a feedback path shunted by a diode, the output of one amplifier controlling the firing angle of one pair of arms and the output of the other amplifier controlling the firing angle of the other pair of arms, means for comparing at the input of each amplifier signals representative of the actual output of converter against a set value, and level detector means for clamping the output of each amplifier so that the output of one amplifier is clamped to zero until the other amplifier reaches maximum output and then the output of said other amplifier is clamped at maximum so long as the first-mentioned amplifier has an output above zero.
Claim 6
Dependent Claim
190 words
A control arrangement for a single-phase bridge converter comprising four arms, each of which includes a conductive controllable device having in effect an anode, a cathode and a control electrode, the arrangement being such that the firing angle of a pair of adjacent arms in which the device cathodes are commoned is controlled separately from the firing angle of the other pair of adjacent arms in which the device anodes are commoned, said arrangement including two amplifiers, each including a feedback path shunted by a diode, the output of one amplifier controlling the firing angle of one pair of arms and the output of the other amplifier controlling the firing angle of the other pair of arms, means for comparing at the input of each amplifier signals representative of the actual output of converter against a set value, and level detector means for clamping the output of each amplifier so that the output of one amplifier is clamped to zero until the other amplifier reaches maximum output and then the output of said other amplifier is clamped at maximum so long as the first-mentioned amplifier has an output above zero.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |