Vending machine control with product delivery motor home detection, motor speed control and power supply
US4785927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Mar 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F9/002
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A vending machine control apparatus has a product delivery motor home circuit and a DC power supply modulated in response to varying line voltage and/or load by a pulse width modulation circuit. The modulated DC power signal supplies power to one or more DC product delivery motors in a vending machine. Each product delivery motor has an associated switch which passes pulses, resulting from the modulation of the power supply, when the delivery motor is in its home position. A simple motor home detection circuit detects these pulses, and preferably a microprocessor control circuit connected to the detection circuit determines that a home condition exists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.