| 摘要 |
A vending machine control circuit having a plurality of capacitively coupled switches for enabling a customer to indicate his choice of a product to be vended. A logic circuit is responsive thereto for controlling the vending of products by the generation of vend signals directed to a plurality of vend solenoids. Out-of-product switches are wired in series with the vend solenoids such that if a solenoid is activated, but no current flows therethrough, a current sensing circuit is utilized to detect that the product is out-of-stock. This is a significant improvement over prior art control circuits, particularly from the standpoint of decreased wiring requirements in the vending machine. The control circuit has an early power failure detecting circuit which allows critical tasks within the machine to be finished prior to removal of the power. This feature allows the machine to shut down in an orderly manner, and enables the totalizer to maintain track of sales even in the event of a power failure. Software within the processor directs the overall operations of the control circuit, including the vend operations, the coin receipt and dispensing functions, and also the cash and product totalizing functions.
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