Diagnostic device for electric mechanism drive circuits
US6784687B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 2003 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Jun 9, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0844
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A diagnostic device for drive circuits has first and second relays each with a movable contact for switching between a normally closed and open contact, a motor are connected to the contacts, first and second resistance voltage dividing circuits connected between the contacts and a reference potential point, a switching circuit connected between two the closed contacts and the reference potential point, and a diagnostic section. The diagnostic section diagnoses a state of supply of drive power to the motor based on voltage-division outputs of the first and second resistance voltage dividing circuits. A bias voltage is supplied to a connection point between the normally closed contacts and the switching circuit. An additional resistance voltage dividing circuit is connected between the connection point and the reference potential pointy. The connection between the motor and a circuit driving the motor based on a voltage-division output of the additional voltage dividing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.