Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1978-09-19
1980-10-07
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361191, H01H 4732
Patent
active
042272300
ABSTRACT:
A switch mode driver for a wire matrix printer employs a single power switch circuit to connect one or more solenoids across a DC source or power and to disconnect those solenoids from that source. Enable signals are provided to select any one or all of the solenoids, such enable signals remaining for a predetermined time during which a slewing period, followed by a chopping period, occur and after which energy remaining in the selected solenoids is returned to the DC power source. The initial ramping of current through the selected solenoids occurs when the power switch circuit is closed for a time period determined by an RC circuit, such time period defining the slewing period. Then the power switch opens and the chopping period begins. The charge on the capacitor of the RC circuit is discharged and at a certain voltage point, the power switch is again closed until the charge on the capacitor of the RC circuit again reaches a predetermined voltage at which time the power switch opens. This chopping action continues until the enabling signals are disabled. In this preferred embodiment, the time when the power switch is turned on is approximately 1/10 of the chopping period.
REFERENCES:
patent: 3789272 (1974-01-01), Vollhardt
patent: 3909681 (1975-09-01), Campari et al.
patent: 4041546 (1977-08-01), Stewart
patent: 4059844 (1977-11-01), Stewart
Devine Thomas G.
Heiting Leo N.
Moose Jr. Harry E.
Sharp Melvin S.
Texas Instruments Incorporated
LandOfFree
Switch mode driver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switch mode driver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switch mode driver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-622043