Apparatus and method for protecting a motor control circuit

Details Apparatus and method for protecting a motor control circuit Apparatus and method for protecting a motor control circuit

1985-10-11

1987-09-01

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318333, 318341, 361 92, 361101, 361 33, G05B 500, H02H 709

Patent

active

046911499

ABSTRACT:
Motor control circuits having solid-state switching elements are commonly used on industrial vehicles such as lift trucks. A short circuit condition in the motor circuit can cause catastrophic failure of the semiconductor switching element. The instant invention detects such a short circuit condition and modifies the motor control signals supplied by a chopper circuit to a switching element. The apparatus includes a trigger circuit for receiving the motor control signals and sensing a voltage across the motor produced in response to electrical power delivered from a power supply.

REFERENCES:
patent: 3408552 (1968-10-01), Weber
patent: 3927357 (1975-12-01), Konrad
patent: 4047233 (1977-09-01), Yorks
patent: 4151519 (1979-04-01), Swygert
patent: 4216517 (1980-08-01), Takahashi
patent: 4241299 (1980-12-01), Bertone
patent: 4270164 (1981-05-01), Wyman
patent: 4291357 (1981-09-01), Hong
patent: 4339701 (1982-07-01), Pritchard
patent: 4348709 (1982-09-01), Mauk
patent: 4432030 (1984-02-01), Bricetti
patent: 4447841 (1984-05-01), Kent
patent: 4472163 (1984-09-01), Melocik
patent: 4484127 (1984-11-01), Salihi
patent: 4508999 (1985-04-01), Melocik et al.
Patents Abstracts of Japan, vol. 4, No. 145 (E-29) (627) 10/14/80 & JP, A, 5596728 (Tokyo Shibaure Denki K.K.) 7/23/80.
Patents Abstracts of Japan, vol. 7, No. 45 (E-160) (1190) 2/23/83 & JP, A, 57194627 (Matsushita Denki Sangyo K.K.) 11/30/82.

Affiliated with

Also associated with

Rating

Apparatus and method for protecting a motor control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for protecting a motor control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for protecting a motor control circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1266917