US5172008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-way sequential power-on circuit
Assignee: Fujitsu Ltd
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Filing: 1990-07-19
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Granted: 1992-12-15
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Expires: 2010-07-19
Abstract
Abstract In a power system having a plurality of power units which are supplied with an external power source and output a power source required for a load, multi-way sequential power-on operation is carried out by enabling two power units, designating as masters beforehand, to be turned on immediately when the external power source is turned on. The master, when turned on, transmits a start signal to two other power units, commanding the addressed power unit to be turned on. The addressed power unit, on receipt of a start signal from any of two other power units, turns on and transmits a start signal to two other power units, and thus propagating start signals on two routes beginning with two masters to sequentially turn on power units by twos at a time.
Inventors
- 👤 Hiroyuki Odagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:28
CPC Classifications
H; H02; H02J; H02J1/00; H02J1/10; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/577; H01; H01H; H01H47/00; H01H47/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A multi-way sequential power-on circuit, operatively connectable to an external power source, for energizing a plurality of power units, comprising: switching means for selecting among the plurality of the power units a master power unit and for energizing the master power unit when the external power source is energized; transmitting means for transmitting a start signal from the master power unit to remaining power units when the master power unit is energized to command the remaining power units to be energized; receiving means in the remaining power units for receiving the start signal; and energizing means for propagating the start signal along a bidirectional route beginning with the master power unit and in response to said receiving means receiving the start signal, to sequentially energize the remaining power units.
Claim 2
Dependent Claim
129 words
A multi-way sequential power-on circuit, operatively connectable to an external power source, for energizing a plurality of power units, comprising: switching means for selecting among the plurality of the power units a master power unit and for energizing the master power unit when the external power source is energized; transmitting means for transmitting a start signal from the master power unit to remaining power units when the master power unit is energized to command the remaining power units to be energized; receiving means in the remaining power units for receiving the start signal; and energizing means for propagating the start signal along a bidirectional route beginning with the master power unit and in response to said receiving means receiving the start signal, to sequentially energize the remaining power units.
Claim 3
Dependent Claim
38 words
A multi-way sequential power-on circuit according to claim 1, wherein said transmitting means comprises: two output lines; a relay operatively connected between the two output lines and wherein: said relay includes a contact to transmit a start signal.
Claim 4
Dependent Claim
48 words
A multi-way sequential power-on circuit according to claim 1, wherein the external power source includes two input lines; and wherein said energizing means comprises: a relay contact operatively connected in series with one of the input lines; and a relay coil operatively connected between the two input lines.
Claim 5
Dependent Claim
30 words
A multi-way sequential power-on circuit according to claim 3, wherein said receiving means comprises: a line operatively connected in series between said relay coil and one of the input lines.
Claim 6
Dependent Claim
28 words
A multi-way sequential power-on circuit according to claim 3, wherein said switching means comprises: a switch operatively connected between said relay coil and one of the input lines.
Claim 7
Dependent Claim
34 words
A multi-way sequential power-on circuit according to claim 1, wherein the external power source includes one input line; and wherein said switching means comprises a switch operatively connected in series with the input line.
Claim 8
Dependent Claim
48 words
A multi-way sequential power-on circuit according to claim 1, wherein said transmitting means of said master power unit includes means for selectively varying an interval between a time when said master unit is energized and a time when the start signal is transmitted to the remaining power units.
Claim 9
Dependent Claim
77 words
A multi-way sequential power-on circuit according to claim 7, wherein each of the plurality of the power units includes two output lines, and wherein said transmitting means comprises: a relay; a resistor operatively connected between one of the output lines and the relay; and a capacitor operatively connected between the two output lines so that the interval varies according to said resistor and said capacitor and wherein: said relay includes a contact to transmit the start signal.
Claim 10
Dependent Claim
55 words
A multi-way sequential power-on circuit according to claim 1, wherein said transmitting means of the plurality of the power units includes means for selectively varying an interval between a time when one of the plurality of the power units is energized and a time when the start signal is transmitted to the remaining power units.
Claim 11
Dependent Claim
77 words
A multi-way sequential power-on circuit according to claim 8, wherein each of the plurality o the power units includes two output lines, and wherein said transmitting means comprises: a relay; a resistor operatively connected between one of the output lines and the relay; and a capacitor operatively connected between the two output lines so that the interval varies according to said resistor and said capacitor and wherein: said relay includes a contact to transmit the start signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |