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A Device For Synchronous Rectification Of The Output Of An Automobile Alternator
Abstract: A device for the synchronous rectification of the output of an automobile alternator, comprising a set of comparators, for sensing the line voltage of the said alternator, the comparators deriving the zero crossings of the lire voltages from the sensed outputs thereof; a one shot, a multiplexer controlled from the one-shot, and a mosfet driver, the one shot being driven by the comparators through the multiplexer and the zero crossing voltages starting the said one shot for deciding the ON state duration of the MOSFET; a demultiplexer through which the one shot output is steered MOSFET driver ,said demultiplexer being controlled from the driver, one-shot.
Notices, Deadlines & Correspondence
Patent Information
Applicants
LUCAS-TVS LIMITED
Inventors
1. DR. VENKATARAMANAN RAMANARAYANAN
2. JAYARAMAN CHANDRASEKARAN
Specification
This invention relates to a device for synchronous rectification of the output of an automobile alternator.
By "synchronous rectification" is meant that the device proposed herein enables MOSFETS to be switched on and off at a frequency equal to that of the generated AC output of the said aI ternator which is required for supplyinq power to the automobile electrical load and also for charging the battery .
While MOSFETs have been used for AC to DC conversion, there are several means adopted for the purpose and known to the art; however, these means suffer from the following disadvantages.
(1) Current transducers are required for identifying the instant of turning ON the MOSFET
switch; and the presence of current sensors adds
to the system cost.
(ii) The duration for keeping the MOSFET switches ON in the individual phases could be
different in different phases on account of the controller configuration. Such operation will lead to imbalance in the operation of the alternator leading to a large current ripple in the DC output current.
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 2656-mas-98 abstract-duplicate.pdf | 2011-09-04 |
| 1 | 2656-mas-98 form-26.pdf | 2011-09-04 |
| 2 | 2656-mas-98 form-19.pdf | 2011-09-04 |
| 2 | 2656-mas-98 abstract.pdf | 2011-09-04 |
| 3 | 2656-mas-98 form-1.pdf | 2011-09-04 |
| 3 | 2656-mas-98 claims-duplicate.pdf | 2011-09-04 |
| 4 | 2656-mas-98 claims.pdf | 2011-09-04 |
| 4 | 2656-mas-98 drawings.pdf | 2011-09-04 |
| 5 | 2656-mas-98 drawings-duplicate.pdf | 2011-09-04 |
| 5 | 2656-mas-98 correspondence-others.pdf | 2011-09-04 |
| 6 | 2656-mas-98 description (complete).pdf | 2011-09-04 |
| 6 | 2656-mas-98 correspondence-po.pdf | 2011-09-04 |
| 7 | 2656-mas-98 description (complete)-duplicate.pdf | 2011-09-04 |
| 8 | 2656-mas-98 description (complete).pdf | 2011-09-04 |
| 8 | 2656-mas-98 correspondence-po.pdf | 2011-09-04 |
| 9 | 2656-mas-98 drawings-duplicate.pdf | 2011-09-04 |
| 9 | 2656-mas-98 correspondence-others.pdf | 2011-09-04 |
| 10 | 2656-mas-98 claims.pdf | 2011-09-04 |
| 10 | 2656-mas-98 drawings.pdf | 2011-09-04 |
| 11 | 2656-mas-98 claims-duplicate.pdf | 2011-09-04 |
| 11 | 2656-mas-98 form-1.pdf | 2011-09-04 |
| 12 | 2656-mas-98 form-19.pdf | 2011-09-04 |
| 12 | 2656-mas-98 abstract.pdf | 2011-09-04 |
| 13 | 2656-mas-98 form-26.pdf | 2011-09-04 |
| 13 | 2656-mas-98 abstract-duplicate.pdf | 2011-09-04 |