Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1994-02-28
1995-09-12
Martin, David S.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388823, 327108, 327576, H02P 5168
Patent
active
054505208
ABSTRACT:
A circuit for sensing the current delivered to a load, or multiple loads, such presented by a polyphase DC motor, without significantly dissipating the energy delivered to the load, has a predriver circuit and a power delivery circuit for each load. The predriver circuit is connected in a series path between a voltage source and a control element of the power delivery circuit, and the power delivery circuit is connected between a connection node and a respective one of the loads. A sensing element is connected in a series path between the source of voltage and the power delivery circuit connection node. In a preferred embodiment, the sensing element is a resistor, the predriver circuit is a PNP transistor, and the power delivery circuit is an NPN transistor. The PNP and NPN transistors are connected to form a pseudo-Darlington transistor pair, with the collectors of the NPN transistors interconnected to enable a single sense resistor to be used to sense the current in each of the loads.
REFERENCES:
patent: 4120305 (1978-10-01), Rhoads et al.
patent: 4125800 (1978-11-01), Jones
patent: 4232257 (1980-11-01), Harshberger
patent: 4403177 (1983-09-01), Weber et al.
patent: 4471283 (1984-09-01), Presley
patent: 4590395 (1986-05-01), O'Connor et al.
patent: 4651069 (1987-03-01), Pellegrini
patent: 4876491 (1989-10-01), Squires et al.
patent: 4885486 (1989-12-01), Shekhawat et al.
patent: 4885517 (1989-12-01), Pennock
patent: 5030899 (1991-07-01), Nishibe et al.
patent: 5032774 (1991-07-01), Juzswik
patent: 5045734 (1991-11-01), Mehl
patent: 5166544 (1992-11-01), Carobolante
Anderson Rodney M.
Bachand Richard A.
Jorgenson Lisa K.
Martin David S.
SGS-Thomson Microelectronics Inc.
LandOfFree
Load current sampling technique does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Load current sampling technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Load current sampling technique will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-412506