Drive circuit system for power window
US5994797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Aug 6, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/55
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A circuit is provided to ensure that even when a drive circuit system for a power window is wetted with water due to the entering of water or the condensatin of water, the opening and closing of the power window can be performed without hindrance. Coils of an opening relay and a closing relay are selectively connected at one end thereof to a power source or ground through a control switch and at the other end to the power source or ground through an electronic circuit which has been subjected to a water-proofing treatment. Even if leakage current flows from a high-potential portion of the coils to ground, the leakage current is caught by electric current flowing from the power source. In addition, even if leakage current flows from the power source to a lower-potential portion of the coils, the leakage current flows to ground without passing through the coils. Therefore, the unintended excitation and de-excitation of the coils can be prevented to thereby reliably open and close the power window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.