US7253596B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply apparatus capable of supplying a stable converted voltage
Assignee: Rohm Co Ltd
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Filing: 2004-10-21
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Granted: 2007-08-07
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Expires: 2024-10-21
Abstract
Abstract A power supply apparatus switchably operates an LDO regulator and a DC/DC converter connected in parallel so as to control a battery voltage Vbat from a power supply at a constant output voltage VO. A detected voltage Vs at a shared output terminal shared by the LDO regulator and the DC/DC converter is input to a feedback input terminal and fed back to the LDO regulator and the DC/DC converter. In order to suppress an undershoot occurring when switching from the LDO regulator to the DC/DC converter, a timing signal generating unit supplies a capability switching timing signal to a pre-drive circuit and switches the control capability of the DC/DC converter from a low capability mode at startup to a high capability mode.
Inventors
- 👤 Isao Yamamoto
- 👤 Yoichi Tamegai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:05
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1588; H02M1/00; H02M1/0045; H02M1/32; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
A power supply apparatus comprising: a series regulator that converts a power supply voltage into a first voltage to output the first voltage to a common output terminal; a switching regulator that converts the power supply voltage into a second voltage to output the converted voltage to the common output terminal; a common feedback unit that feeds a detected voltage at the common output terminal back to said series regulator and said switching regulator; a control terminal that inputs a switching control signal; a switching control unit that switchably puts said series regulator and said switching regulator into operation in response to the switching control signal; and a capability switching unit that controls the capability of said switching regulator to be lowered than normal in the beginning of its operation caused by said switching unit.
Claim 2
Dependent Claim
135 words
A power supply apparatus comprising: a series regulator that converts a power supply voltage into a first voltage to output the first voltage to a common output terminal; a switching regulator that converts the power supply voltage into a second voltage to output the converted voltage to the common output terminal; a common feedback unit that feeds a detected voltage at the common output terminal back to said series regulator and said switching regulator; a control terminal that inputs a switching control signal; a switching control unit that switchably puts said series regulator and said switching regulator into operation in response to the switching control signal; and a capability switching unit that controls the capability of said switching regulator to be lowered than normal in the beginning of its operation caused by said switching unit.
Claim 3
Dependent Claim
13 words
An electronic information appliance having power supply apparatus according to claim 1 .
Claim 4
Dependent Claim
41 words
The power supply apparatus according to claim 1 , wherein said switching control unit provides a period of time in which said series regulator and said switching regulator are concurrently operated in switching from said series regulator to said switching regulator.
Claim 5
Dependent Claim
31 words
The power supply apparatus according to claim 3 , wherein said capability switching unit returns said switching regulator to a normal capability when the period of time for concurrent operation expires.
Claim 6
Dependent Claim
31 words
The power supply apparatus according to claim 4 , wherein said capability controls unit switching the capability of said switching regulator by adjusting the on duty period of said switching regulator.
Claim 7
Dependent Claim
146 words
The power supply apparatus according to claim 4 , wherein said switching control unit includes a timing signal generating unit receiving a switching control signal to control switching of said series regulator and said switching regulator and generating an on-off switching timing signal for said series regulator and a capability switching timing signal outputted to said capability switching unit for said switching regulator, and wherein when said timing signal generating unit receives the switching control signal designating switching from said series regulator to said switching regulator, said timing signal generating unit generates the on-off switching timing signal which turns said series regulator off when a predetermined period of time elapses since the input of the switching control signal, and generates the capability switching timing signal which switches said switching regulator from a low capability to a high capability when a predetermined period of time further elapses.
Claim 8
Dependent Claim
13 words
An electronic information appliance having power supply apparatus according to claim 4 .
Claim 9
Dependent Claim
146 words
The power supply apparatus according to claim 5 , wherein said switching control unit includes a timing signal generating unit receiving a switching control signal to control switching of said series regulator and said switching regulator and generating an on-off switching timing signal for said series regulator and a capability switching timing signal outputted to said capability switching unit for said switching regulator, and wherein when said timing signal generating unit receives the switching control signal designating switching from said series regulator to said switching regulator, said timing signal generating unit generates the on-off switching timing signal which turns said series regulator off when a predetermined period of time elapses since the input of the switching control signal, and generates the capability switching timing signal which switches said switching regulator from a low capability to a high capability when a predetermined period of time further elapses.
Claim 10
Dependent Claim
78 words
The power supply apparatus according to claim 6 , wherein said capability switching unit starts said switching regulator in a low capability mode by providing a delay for a turn-on-timing of said switching regulator, when said timing signal generating unit receives the switching control signal, and switches from a low capability to a normal capability by canceling the delay for the turn-on-timing of the switching regulator, when said timing signal generating unit generates the capability switching timing signal.
Claim 11
Dependent Claim
78 words
The power supply apparatus according to claim 8 , wherein said capability switching unit starts said switching regulator in a low capability mode by providing a delay for a turn-on-timing of said switching regulator, when said timing signal generating unit receives the switching control signal, and switches from a low capability to a normal capability by canceling the delay for the turn-on-timing of the switching regulator, when said timing signal generating unit generates the capability switching timing signal.
Claim 12
Dependent Claim
131 words
A power supply control method comprising: receiving, from a control terminal, a switching control signal which designates switching from a series regulator that converts a power supply voltage into a first voltage to output the first voltage to a common output terminal, to a switching regulator that converts the power supply voltage into a second voltage to output the second voltage to the common output terminal; turning said switching regulator on with a capability lower than normal when the switching control signal is received; turning said series regulator off when a predetermined period of time elapses since the generation of the switching control signal; and switching said switching regulator from a low capability to a normal capability when a predetermined period of time elapses since the turning said series regulator off.
Claim 13
Dependent Claim
131 words
A power supply control method comprising: receiving, from a control terminal, a switching control signal which designates switching from a series regulator that converts a power supply voltage into a first voltage to output the first voltage to a common output terminal, to a switching regulator that converts the power supply voltage into a second voltage to output the second voltage to the common output terminal; turning said switching regulator on with a capability lower than normal when the switching control signal is received; turning said series regulator off when a predetermined period of time elapses since the generation of the switching control signal; and switching said switching regulator from a low capability to a normal capability when a predetermined period of time elapses since the turning said series regulator off.
Claim 14
Dependent Claim
29 words
The power supply control method according to claim 11 , wherein the capability of said switching regulator is controlled by adjusting an on duty period of said switching regulator.
Claim 15
Dependent Claim
83 words
The power supply control method according to claim 11 , wherein, in the turning said switching regulator on with a capability lower than normal, said switching regulator is started with a low capability by providing a delay for a turn-on-timing of said switching regulator, and wherein, in the switching said switching regulator from a low capability to a high normal capability, switching from a low capability to a normal capability is effected by canceling the delay for the turn-on-timing of the switching regulator.
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) | 2010-08-06 | 2011-02-05 | 2011-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-08-06 | 2015-02-05 | 2015-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-08-06 | 2019-02-05 | 2019-08-07 | $7700.00 | Window Closed / Lapsed |