US Patent No: 7,894,222
Number of patents in Portfolio can not be more than 2000
Method and apparatus to limit maximum switch current in a switching power supply
Stats
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Feb 22, 2011
Issued date -
Aug 13, 2009
filing date -
12/541,104
serial no -
In Force
status
Importance
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Abstract
Techniques are disclosed to limit the current in a switch of a switching power supply. An example switching regulator circuit includes a power switch to be coupled to an energy transfer element of a power supply. A controller to generate a drive signal is coupled to be received by the power switch to control the switching of the power switch. A short on time detector is included in the controller. The short on time detector is to detect an occurrence of a threshold number of one or more consecutive short on times of the switch. A frequency adjuster is also included in the controller and coupled to the short on time detector. The frequency adjuster is to adjust an oscillating frequency of an oscillator included in the controller in response to the short on time detector.
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First Claim
Related Publications
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International Classification(s)
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- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 6,914,789 Switching power supply apparatus with blanking pulse generator | 15 | 2003 | |
| 6,980,444 Switching power supply | 11 | 2004 | |
| 7,161,815 Constant current drooping switching power supply | 13 | 2005 | |
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| 5,229,707 Apparatus and method for eliminating false current limit triggering in a grounded source-emitter power switching circuit | 14 | 1992 | |
| 6,788,038 Apparatus and method for deactivating an on-switch of a circuit for a variable time interval | 7 | 2003 | |
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| 5,335,162 Primary side controller for regulated power converters | 57 | 1993 | |
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| 4,616,301 Regulator control system | 16 | 1984 | |
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| 4,928,200 Overcurrent protection for switching mode power converter | 43 | 1987 | |
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| 5,825,234 Switch-control integrated circuit | 18 | 1996 | |
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| 6,344,980 Universal pulse width modulating power converter | 31 | 1999 | |
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| 5,164,659 Switching circuit | 22 | 1991 | |
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| 6,094,362 Switched-mode power converter with triple protection in a single latch | 33 | 1998 | |
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| 6,788,555 Regulation of bi-directional flyback converter | 11 | 2002 | |
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| 7,239,532 Primary-side feedback switching power supply | 33 | 2006 | |
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| 5,852,550 Switched-mode power supply circuit having a very low power stand-by mode | 37 | 1997 | |
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| 2007/0008,756 Method and apparatus to limit maximum switch current in a switching power supply | 11 | 2005 | |
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| 4,716,510 Automatic restart circuit for a switching power supply | 20 | 1986 | |
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| 6,011,706 Control of the output power of a DC-DC converter upon varying the switching frequency | 22 | 1998 | |
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| 7,054,171 Limiting the continuous mode of a power converter | 6 | 2000 | |
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| 6,061,257 Wholly integrated protection from the effects of a short circuit of the output of a flyback converter | 16 | 1999 | |
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| 2005/0024,898 PRIMARY-SIDE CONTROLLED FLYBACK POWER CONVERTER | 18 | 2003 | |
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| 6,151,226 Four quadrant power conversion topology | 8 | 1999 | |
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| 4,791,544 Regulating control for single-ended switching power supply | 43 | 1988 | |
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| 5,088,016 Voltage-compliant DC-DC converter module | 14 | 1990 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Aug 22, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Aug 22, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 22, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |