JP2595115B2 - Vending machine heating control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a heating control device for a vending machine.

[Prior art]

In a conventional vending machine provided with an independent heating device for each of a plurality of refrigerators, if a heating / cooling changeover switch for an arbitrary refrigerator is set to the cooling side, the power supply to the heating device in the refrigerator is forcibly performed. On the other hand, if the heating / cooling switch is set to the heating side, the heating device is turned on, and if the inside of the refrigerator reaches a certain predetermined temperature, the heating device is turned off. When the temperature of the inside of the refrigerator falls below a predetermined temperature, the power is supplied again, and the inside of the refrigerator is kept at a constant heating temperature. However, for example, when the inside of the four compartments is set to the heating side, or when the inside of the three compartments is heated,
When the remaining one chamber is set to the cooling side, since the total number of heating devices and cooling devices to be driven increases, when all the heating devices and cooling devices are turned on at the same time at start-up, etc. The total input current of the vending machine including the fluorescent lamp circuit of the lighting unit and the internal control circuit may exceed 15 A which is the maximum allowable current value of a general outlet circuit. Therefore, for example, when all four chambers are set to the heating side, the heating priority is set for the four chambers, and the heating priority is set even if there is a simultaneous heating request for the four chambers. Heating is performed on the three chambers, and if one of the heated chambers or the chamber with the highest priority of heating is heated to a predetermined temperature, the heating of the chamber is stopped and the remaining chambers are heated. The total input current of the vending machine is reduced to a specified value or less by heating the interior of the refrigerator that is not heated.

[Problems to be solved by the invention]

However, in a vending machine that performs such control, in a refrigerator having a low heating priority, a state in which heating is not sufficiently performed because heating is postponed may occur. A problem of selling unheated products. The present invention has been made in order to eliminate the above-described problems, and in a range where the total input current of the vending machine does not exceed an allowable value with respect to a heating device which is originally turned off by control of heating priority. It is an object of the present invention to provide a heating device for a vending machine in which heating performance is improved by energizing.

[Means for Solving the Problems]

The heating control device for a vending machine according to the present invention is provided with a heating control device for a vending machine in which heating priorities are set so that heating devices provided in each of the refrigerators are not simultaneously turned on in order to reduce the total input current. In the apparatus, a phase control unit for controlling the duty ratio of the heating device without the setting of the heating priority, a current detection unit for detecting the input current value of the vending machine, and a heating device without the setting of the heating priority Control means for sending a control signal to the phase control means so that the input current value detected by the current detection means is equal to or less than a predetermined value when there is an energization request. I do.

[Action]

According to the above configuration, the heating device M in which the heating priority is set
Is off, the total input current does not exceed the specified allowable current value even if the heating device N without the heating priority setting is turned on. If there is, the phase control means
%, But when all the heating devices M for which the priority heating is set are turned on, a request to turn on the heating device N for which the heating priority is not set means that the total input current exceeds the allowable input current. By transmitting a predetermined control signal from the control means to the phase control means so as not to exceed the current, the duty ratio of the heating device N for which the heating priority is not set is limited.

【Example】

FIG. 1 is a control block diagram showing one embodiment of the apparatus of the present invention. 1 is an insertion plug of the vending machine, 2
Is an earth leakage breaker for detecting an earth leakage accident in this vending machine, 3 is a rectifier circuit for rectifying 100 V AC to a low DC voltage, and 4 is for stabilizing the rectified voltage to a constant voltage. Voltage stabilization circuit. 5 is a CPU (central processing unit) for centrally controlling the vending machine,
An output voltage from the voltage stabilizing circuit 4 is supplied. 6
(6A to 6D) are inside four chambers (not shown) (A, B, C, D)
Is a changeover switch for setting whether to heat or cool the device. Numeral 7 is an input unit composed of a transistor array, and inputs the setting state of the changeover switch 6 to the CPU 5. Reference numerals 8 (8A to 8D) denote heating devices provided in the insides A to D, respectively. To these heating devices 8, triacs 9 (9A to 9D), which are energization control elements, are connected in series. . Reference numeral 10 (10A to 10D) denotes a thermistor that detects the temperatures of the internal compartments A to D. Reference numeral 11 denotes a current transformer for detecting the total input current of the vending machine. A detection signal from the current transformer 11 is rectified by a rectifier circuit 12 into a DC voltage. 13 is A /
A D converter, which converts the output signals from the thermistor 10 and the rectifier circuit 12 from analog to digital signals,
To send to. The CPU 5 sends a control signal to the triac 9 via the photocoupler 13 to control the heating device 8 based on a detection signal from the thermistor 10. 14 is a cooling device for cooling the inside of the refrigerator set to cooling,
Reference numeral 15 denotes an illumination circuit for illuminating the lighting plate portion of the vending machine.The cooling device 14 and the illumination circuit 15
ON / OFF control is performed via a relay X controlled by U5 and contacts x and t of a timer T. The CPU 5 also includes a determination unit 5x for determining whether or not the above-described priority control is necessary based on the number of settings to the heating side by the changeover switch 6, and a priority order for heating the inside of the refrigerator when the priority control is required. And a setting unit 5y for setting. Next, control in the vending machine having the above configuration will be described. In this vending machine, when the insides A, B, C, and D are all heated by switching the changeover switch 6 (hereinafter referred to as operation mode I), for example,
When three of B and C are heated and the remaining interior D is cooled (hereinafter referred to as operation mode II), priority control is required because the maximum input current of the vending machine exceeds 15A,
In the operation mode I, when there is an operation request for all the heating devices 8A to 8D, the setting of the setting section 5y causes
To D, and the operation of the heating devices 8A to 3C during operation of the cooling device 14 in the operation mode II.
When all the operation requests are made, the operation of the heating devices 8B and 8C is prioritized, and if the operation mode is other than the above operation modes, the priority control is not required. First, in step S1, the setting state of the changeover switches 6A to 6D is detected, and in step S2, the necessity / unnecessity of the priority control is determined from the setting state. That is, if the operation mode I is II
It is determined by the determination unit 5x whether the priority control is necessary or not in other operation modes. When the priority control is unnecessary, that is, when the number of chambers to be heated is 2 or less, the chamber temperatures by the thermistors 10A to 10D are detected in step S3, and based on the detected chamber temperatures in step S4, On / off control of the cooling device 14 and the heating device 8 for the interior of the heating setting is controlled by the triac 9. On the other hand, in the operation mode I in which the interiors A to D are all heated, the process proceeds from step S2 to step S11, in which the interior temperature is detected by the thermistors 10A to 10D, and in the next step S12, the detected interior 4 heating devices from temperature 8
It is determined whether or not there is a request for simultaneous operation of A to 8D. If there is no request for simultaneous operation of all four units, the heating device 8 for the inside of the refrigerator having a heating request is turned on / off in step S13. However, when there is a request for simultaneous operation of all four units,
In step S14, the interior B to which the heating priority is set
The heating devices 8B to 8D for D are on / off controlled,
The heating device 8A for the remaining inside A is controlled by the control signal sent to the triac 9A in step S15 within a limit that the total input current of the vending machine detected by the current transformer 11 does not exceed 15A. The phase is controlled and the duty ratio is limited. As described above, when the three heating devices 8B to 8 are turned on, the remaining heating device 8A is turned off in the conventional device, but in the present invention, the heating device 8A is turned on within the limit of the allowable current of 15A. Since the power is supplied, the heating performance is improved. Also, at this time, when the lighting circuit 15 is turned off at night or the like, the current consumption of the lighting circuit 15 can be supplied to the heating device 8A, and the conduction rate increases, so that the heating performance further improves. On the other hand, for example, in the operation mode II in which the insides A to D are heated and the inside D is cooled, the process proceeds from step S2 to step S31, where the thermistors 10A to 10D detect the temperatures of the insides A to D, and The cooling device 14 is turned on / off in step S32 based on the detected temperature of the inside D. In the next step S33, it is determined whether there is a request for simultaneous operation of the three heating devices 8A to 8C based on the detected inside temperature. If there is no request for simultaneous operation of all three units, step S34 The heating device 8 is controlled to be turned on / off with respect to the inside of the chamber where the heating is requested. However, when the simultaneous operation of all three units is requested, in step S35, the setting unit 5y sets the priority heating by the setting unit 5y. The heating devices 8B and 8C for the inside B and C are on / off controlled, but the heating devices 8A for the remaining inside A are controlled in step S36.
As above, the total input current of this vending machine is 15A
Is controlled within a limit not exceeding. Therefore, in this case, if the cooling device 14 is on, the phase of the heating device 8A is controlled.
%, And also in this case, the heating performance is improved.

【The invention's effect】

As described above, according to the present invention, as a result of the control of the heating priority, the heating device without the setting of the heating priority, which has conventionally been in the off state, can perform the phase control within a range where the total input current does not exceed the specified allowable value. As a result, the heating performance for the product is improved, and a problem that a product that is not sufficiently heated is sold can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vending machine showing an embodiment to which a heating control device of the present invention is applied, and FIG. 2 is a flowchart showing a control operation of the device of FIG. DESCRIPTION OF SYMBOLS 1 ... Plug, 2 ... Leakage breaker, 3 ... Rectifier circuit, 4 ... Voltage stabilization circuit, 5 ... CPU, 6 ... Changeover switch, 7 ... Input part, 8 ... Heating device, 9 ... triac, 10 ... thermistor, 11 ... current transformer, 12 ... rectifier circuit, 13 ... photocoupler, 14 ... cooling device, 15 ... lighting circuit.

Claims (1)

(57) [Claims] 1. A heating control device for a vending machine in which heating priorities are set so that heating devices provided in each compartment are not turned on at the same time so as to reduce the total input current. Phase control means for controlling the duty ratio for the heating device without the, current detection means for detecting the input current value of the vending machine, when there is a power supply request to the heating device without the setting of the heating priority, Heating means for transmitting a control signal to the phase control means so that the input current value detected by the current detection means is equal to or less than a predetermined value. apparatus.