JPH06223261A - Power supply unit for automatic vending machine - Google Patents

Abstract

PURPOSE:To eliminate the necessity of periodical replacement of battery by using an accumulating medium having life same as that of an automatic vending machine with the battery. CONSTITUTION:At the time of steady operation, AC power is supplied from an input power supply 1 to an AC/DC converter 2 and converted to DC power to be outputted from the converter 2. The DC power is converted into AC power by a DC/AC converter 3 and the AC power is applied to an automatic vending machine 5. The DC power from the converter 2 is accumulated in a capacitor 4, and the accumulation is performed for several seconds after turning on the input power supply 1. When a momentary break occurs, the converting operation of the converter 2 is stopped, power stored in the capacitor 4 is discharged to the converter 3, which converts the discharged power into AC power and applies the AC power to the machine 5. The discharge of the capacitor 4 is performed for about several hundred milliseconds (msec) after the interruption of the power supply 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a vending machine used in an environment where momentary power interruptions (instantaneous power interruptions) occur regularly.

[0002]

2. Description of the Related Art Normally, a vending machine is manufactured on the assumption that a commercial power source is used and operates normally up to a momentary power failure of about 20 to 30 mS, but a momentary power failure for a longer time occurs. Then, the function of the microcomputer, which is the main body of control, may stop, or the solenoid that carries out the product may not function normally.

By the way, 20 such vending machines are available.
AC power sources that generate relatively long momentary power interruptions of more than ~ 30 mS on a regular basis, for example, if you try to use it by mounting it on a vehicle such as the Shinkansen, you will be able to carry out the goods or return the money, even if you have inserted money. The normal (normal) operation of may be disabled. Therefore, conventionally, an uninterruptible power supply device (also abbreviated as UPS) equipped with a battery was used, and during a relatively long time instantaneous power failure as described above, an alternating current power supply was generated by an inverter inside the UPS using the battery as an auxiliary power supply. As a result, normal operation is ensured even for a relatively long-term power failure. Further, in order to secure the life of the battery, control may be performed so that no power is supplied to the vending machine during a long power failure.

[0004]

However, even in this case, the life of the battery is as short as about 2 to 3 years, and it is usually possible to make it as short as the life when there is no instantaneous blackout. For this reason, it is the current situation that regular battery replacement work is indispensable for manufacturers and operating companies who use vending machines for a long period of time. Therefore, the problem to be solved by the present invention is to eliminate the need for periodical replacement of the battery in a power supply for a vending machine capable of backing up a momentary power failure for a relatively long time.

[0005]

In order to solve such a problem, the present invention allows an automatic vending machine to charge and discharge an alternating current-direct current converter for converting alternating current of an input power source into direct current and a converted direct current. It is possible to guarantee the normal operation of the vending machine even in an environment in which a momentary power failure (instantaneous power interruption) occurs regularly by providing a power storage medium and a DC-AC converter that converts DC to AC. Is characterized by.

[0006]

By using a storage medium having a life equivalent to that of the vending machine instead of the battery, it is possible to ensure normal operation (normal operation) of the vending machine and eliminate the need for periodic replacement of the storage medium.

[0007]

1 is a block diagram showing an embodiment of the present invention, in which 1 is an input power source, 2 is an AC / DC converter, and 3 is a DC / DC converter.
An AC converter, 4 is a capacitor as a power storage medium, and 5 is a vending machine. (1) During steady operation At this time, the AC power supply is supplied from the input power supply 1 to the AC-DC converter 2. From the AC-DC converter 2, the input power supply 1 is converted into DC power and output. This DC power is converted into AC power by the DC-AC converter 3 and given to the vending machine 5. Further, the DC power from the AC-DC converter 2 is stored in the capacitor 4, and the storage time is about several seconds after the input power supply 1 is turned on. The above operation is shown in FIG. 2A, in which an rectifier is used as the AC-DC converter and an inverter is used as the DC-AC converter.

(2) At momentary power failure When the input power source 1 is momentarily shut off, that is, a so-called momentary power failure occurs, the conversion operation by the AC-DC converter 2 is stopped. As a result, the electric power stored in the capacitor 4 is discharged to the DC / AC converter 3, so that the DC / AC converter 3
Converts this into AC power and supplies it to the vending machine 5. The discharging time of the capacitor 4 is about several hundred milliseconds (mSec) after the input power supply 1 is cut off. The state at this time is shown in FIG. As a result, not only is it possible to back up a momentary power failure for a relatively long time, but the life of the capacitor 4 is reduced by the vending machine 5.
Since it is almost the same as that of No. 1, it is possible to eliminate the need for periodical replacement of the capacitor as the storage medium.

[0009]

According to the present invention, the electricity storage medium having a life equivalent to that of the vending machine is used instead of the battery, so that (a) the periodic exchange of the electricity storage medium becomes unnecessary. (B) It is not necessary to perform control for not supplying power during a long power failure. The advantages such as are obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the operation of FIG.

[Explanation of symbols]

1 ... Input power source, 2 ... AC-DC converter, 3 ... DC-AC converter, 4 ... Capacitor, 5 ... Vending machine.

Claims (1)

[Claims] 1. A vending machine, an AC-DC converter for converting AC of an input power source into DC, a storage medium capable of charging and discharging the converted DC, and DC-AC conversion for converting DC to AC. A power supply device for a vending machine, which is capable of guaranteeing normal operation of the vending machine even in an environment in which momentary power interruptions (instantaneous power interruptions) occur regularly.