KR910003605Y1 - Power supply control circuit - Google Patents

Abstract

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Description

Cold. Power supply control circuit of on-demand vending machine

1 is a circuit diagram of the present invention.

2 is the time chart at initial power up.

3 is a time chart when the refrigeration unit is 'on' while the heater is 'on'.

* Explanation of symbols for main parts of the drawings

5: Refrigeration Unit T ₁ : Trans

H ₁ : Heater R ₁ -R ₄ : Resistance

D ₁ -D ₄ : Diode C ₁ -C ₄ : Capacitor

Q ₁ : Transistors RYK, RYC, RYH, RH, RC: Relay

SW ₁ : On-sensing switch SW ₂ : Cold-sensing switch

The present invention is a cold and hot vending machine using a combination of 100 / 220V, the cold current to reduce the capacity of the main transformer by preventing the starting current of the refrigeration unit (UNIT) and the operating current of the heater can be injected at the same time The present invention relates to a power supply control circuit of an on-demand vending machine.

In the cold and hot vending machines, which are increasingly used day by day, heaters for warming beverages and refrigeration units for cold beverages are used, and these heaters and refrigeration units are operated separately. Since the starting current of is about twice the operating current, the transformer must be large and the fuse can be blown to compensate for this.

In the case of a vending machine, since a circuit requiring a constant voltage is used together, such as a precision IC circuit, this large current may cause confusion in these IC circuits.

Conventionally, to prevent this, a simultaneous input prevention circuit (CU C circuit of the vending machine) has been proposed to prevent the power to be simultaneously supplied to the heater and the refrigeration unit when the initial power is turned on, but this is applicable only when the initial power is turned on. There was a disadvantage that can not prevent the power to the refrigeration unit at the same time.

In view of the above, the present invention can temporarily reduce the power of the heater when starting the refrigeration unit to prevent the flow of large current by the starting current, thereby reducing the capacity of the transistor and preventing the inflow of large current, thereby improving the stability of the entire circuit. In order to provide a power control circuit of a cold / hot combined vending machine, the present invention for this purpose will be described in detail with reference to the accompanying drawings.

The power supply (100V) is voltage-dropped at the transformer (T ₁ ) and rectified and smoothed at the diode (D ₁ ) and the capacitor (C ₄ ), through the relay contacts (RH-1a) (RC-1b), and then the relay contacts (RC-2a). ) And the relay (RYC) and the resistor (R ₁ ) (R ₄ ) is configured to be applied to the relay contact (RC-2a) while connecting the capacitor (C ₁ ) and at the same time the resistor (R ₃ ) and relay contact (RC) The relay (RYK) is connected and configured through -2b).

And a resistance (R _4), the capacitor (C ₂₎ the connection and a resistance (R _1), the relay contact (RYK-2a) and a capacitor (C ₃₎ for connection, and at the same time the transistor (Q ₁ via the resistor (R ₂₎ The base of the transistor Q1 is connected to the collector side of the transistor Q ₁ through a relay contact RYK-1a and a relay RYH and then connected to a transformer T ₁ through a relay contact RH-2a.

In addition, the power supply 220V is applied to the heater H ₁ through the relay contact RYH-1a and to the relay RH RC through the on-sensing switch SW ₁ and the cold sensing switch SW ₂ . It is configured to be applied to the condenser motor (M) and the refrigeration unit (5) through the relay contact (RYC-1a) (RC-3b).

And the cold detection switch (SW ₂ ) of the present invention is a switch that is "off" when the temperature of the cold beverage rises above the prescribed temperature and "on" below the specified temperature, and the on-sensing switch (SW ₁ ) is the temperature of the beverage The switch is "off" if it is over the temperature and "on" if it is below the specified temperature. In this design, the colored contacts of the relay contacts are "on" when the relay is not excited, and the contacts that are not painted are excited. When it is "on" is a contact.

In the drawings, reference numerals D _{3 and} D ₄ denote relay protection diodes.

The effects of the present invention configured as described above will be divided into two cases when the refrigerating unit 5 is “on” when the initial power is turned on and the heater H ₁ is “on”.

First, look at the initial power on as follows.

When the power supply (100 / 200V) is turned on in the cold and warm state, the on-sensing switch (SW ₁ ) is "on" and the cold-sensing switch (SW ₂ ) is "off". &Quot; ON " of ON sensing switch SW ₁ to excite relay RH and " OFF " of cold sensing switch SW ₂ so that relay RC does not excite.

Therefore, the relay contacts RH-1a (RH-2a) are "on" and the relay contacts RC-1b (RC-2b) and RC-3b are "on" (second (A ) Reference).

Then, after the voltage dropped from the transformer T ₁ to 12V with the ON of the relay contact RH-1a RC-1b is rectified and smoothed in the diode D ₁ and the capacitor C4, the resistor R ₁ Through -R ₄ ) is charged to the capacitor (C ₂ ) (C ₃ ).

At this time, since the relay RC is not excited and the relay contact RC-2a is in the "off" state, the relay RYK is not excited and thus the relay contacts RYK-1a and RYK-2a are "on". Will be.

On the other hand, when charging is completed in the capacitor (C ₂ ) after a certain time, the relay (RYC) is excited and the relay contact (RYC-1a) is "on" by excitation of the relay (RYC), so that the power supply 220V is a relay contact ( The relay unit RC is not excited after RYC-1a and is applied to the refrigeration unit 5 through the relay contact RC-3b which is "on", thereby operating the refrigeration unit 5.

That is, the excitation time of the relay (RYC) is excited after the delay time by the capacitor (C ₂ ) and the resistor (R ₄ ) as shown in FIG. 2B after the power is turned on. When the relay (RYC) is excited, the relay contact (RYC-1a) is excited. ) Is turned on so that the refrigerating unit 5 operates as shown in FIG. 2E. At this time, the refrigerating unit 5 operates as the starting current flows in the refrigerating unit 5 as shown in FIG. .

When a predetermined time (the time charged to the capacitor C ₃ ) elapses after the relay RYC is "on", the current passing through the resistor R ₂ is applied to the base of the transistor Q ₁ , and the transistor ( As Q ₁ ) becomes conductive, the relay RRY is excited.

At this time, the reason that the current is charged in the capacitor (C ₃ ) is because the relay (RYC) is not excited and the relay contact (RYK-2a) is "on", so the current through the resistor (R ₁ ) is supplied to the capacitor (C ₃ ). It is charged.

Accordingly, when the charging time charged in the capacitor C ₃ passes, the transistor Q ₁ conducts and the current flows through the relay RYH through the relay contact RYK-1a as shown in FIG. 2C. The charging time of ₃ ) is set so that charging is completed after the starting current of the refrigerating unit 5 flows as shown in FIG. 2F.

When the relay RYH is excited after the start current flows in the refrigerating unit 5 as described above, and the relay contact RYH-1a is "on", power is supplied to the heater H ₁ as shown in FIG. ₁ ), the total current flowing through the vending machine is within the range that the heater operating current and the refrigeration unit's operating current do not exceed the refrigeration unit's starting current as shown in Fig. 2f, so the capacity of the transformer T ₁ needs to be increased. There will be no.

That is, in the conventional vending machine, when the refrigerating unit and the heater are operated at the same time, the total current flows considerably as shown in FIG. 2B, and the capacity of the transformer T ₁ must be increased.

However, in the present invention, the operation of the heater H ₁ after the start current flows by operating the refrigerating unit 5 has the advantage that the total current value may be considerably lower, as shown in FIG.

When the temperature of the beverage side in which the heater H ₁ is operated for a certain time rises above the prescribed temperature, the on-sensing switch SW ₁ is “off” so as not to excite the relay RH. Accordingly, the relay contact RH-1a (RH-2a) is "off" and the relay RYH is not excited, so the relay contact RYH-1a is "off" to stop the operation of the heater H ₁ and the refrigerating unit 5 for a certain time. When the temperature of the cold drink drops below the specified temperature, the cold detection switch (SW ₂ ) is turned "on". When the cold detection switch (SW ₂ ) is "on", the relay (RC) is excited and the relay contact (RC- 1b) Since "RC-2b" and "RC-3b" are "off", no current is supplied to the refrigeration unit 5 so that the operation of the refrigeration unit 5 is stopped and at the same time the relay contact RC-2a is closed. given to "oN" to give a power to the transformer (T ₁₎ to be charged in the capacitor (C _1).

Looking at the case when the temperature of the cold drink again to perform the above operation to "on" the refrigeration unit (5) as follows.

That is, the case in which the temperature of the cold beverage becomes higher than the prescribed temperature while the heater H ₁ is "on" will be described for driving the refrigerating unit 5 again.

First, since the relay RH is excited when the heater H ₁ is "on", the relay contacts RH-1a and RH-2a are "on" as shown in FIG. Since the relay RC is excited when 5) is "off", the relay contacts RC-1b, RC-2b and RC-3b are "off" as in the first half of FIG. -2a) is " on " as in FIG. 3C.

In this state, when the temperature of the cold beverage rises above the prescribed temperature, the cold detection switch SW ₂ is turned “off”, and the relay RC is excited and thus the relay contacts RC-1b and RC-2b. RC-3b is " on " and relay contact RC-2a is " off ".

That is, before the refrigeration unit 5 is operated, the heater H ₁ is operated as in FIG. 3h so that the entire current flows only the heater operating current as in FIG. 3i, and the refrigeration unit 5 is in FIG. 3g. Will not work.

However, if the temperature of the cold beverage rises above the prescribed temperature, the cold sensing switch SW ₂ is "off" to release the excitation of the relay RC as described above, so that the relay contacts RC-1b and RC-2b are released. RC-3b is "on" as in FIG. 3b and the relay contact RC-2a is "off" as in FIG. 3c.

When the excitation of the relay RC is released so that the relay contact RC-2b is "on", the charge charged in the capacitor C ₁ is transferred to the relay RYK through the "on" relay contact RC-2b. Since it is applied, the relay RYK is excited during the discharge time of the capacitor C ₁ as shown in the 3d diagram.

As such, when the relay RYK is excited, the relay contact RYK-1a is " off " during the discharge time of the capacitor C ₁ as shown in FIG. 3E, and the relay RYH is turned off by the relay contact RYK-1a. When the excitation of, the relay contact (RYH-1a) is "off" accordingly, the power applied to the heater (H ₁ ) is cut off with the "off" of the cold detection switch (SW ₂ ) as shown in FIG. .

When the power applied to the heater H ₁ is cut off, the relay RYC is excited after a delay time by the capacitor C ₂ and the resistor R ₄ as shown in FIG. 3 (F ₁ ). When RYC is excited, the relay contact RYC-1a is "on" and power is supplied to the refrigeration unit 5 as shown in FIG. 3g, so that the starting current flows to the refrigeration unit 5 as shown in FIG. 3i. .

At this time, when the starting current of the refrigerating unit 5 flows, the driving of the heater H ₁ is stopped. Therefore, the large current flow is prevented when the refrigerating unit 5 is driven. The discharge time of the condenser C ₁ starts the refrigerating unit 5. Set the time for the current to flow sufficiently.

After the start current of the refrigerating unit 5 flows, the discharge of the capacitor C ₁ ends and the spare part of the relay RYK is released, so that the relay contact RYK-1a is "on" and the relay RYH is excited. It presented and yiettara relay contact (RYH-1a) is "on" the heater (H _1), the, the driving current as in the 3i also be power supply is turned doemeurosseo heater (H ₁₎ and the freezer unit (5) is caused to flow back .

As described above, the present invention energizes the relay RYK when the refrigeration unit 5 is started (that is, when the starting current flows) while the heater H ₁ is turned on, thereby relaying the relay contact RYK-1a. ) Turns off the power supply of the heater H ₁ and turns on the heater H ₁ after the start current of the refrigerating unit 5 flows, thereby turning on the starting current of the refrigerating unit 5. And operating currents of the heater (H ₁ ) cannot be input at the same time.

Therefore, the present invention reduces the power by temporarily shutting off the power of the heater when the refrigeration unit is operated at the same time, reducing the capacity of the main transformer, and reducing the cost. As a result, the safety of the entire circuit can be ensured.

Claims (1)

In the cold / hot combined vending circuit for driving the heater (H ₁ ) and the refrigerating unit (5), a hot and cold sensing switch for sensing the hot beverage and cold beverage to control the excitation of the relay (RH) (RC) ( SW ₁ ) (SW ₂ ) and the relay contact (RH) in which the voltage drop in the transformer (T ₁ ) and the rectified smooth power in the diode (D ₁ ) and the capacitor (C ₄ ) are interlocked with the relay (RH) (RC). A capacitor C ₁ (C ₂ ) to be charged through -1a (RC-1b) (RC-2a), a relay RYC excited by the charging voltage of the capacitor C ₂ , and the capacitor ( The connection between the relay RYK connected through the relay contact RC-2b that is excited by the charging voltage of C ₁ and interlocked with the relay RC, and the relay contact RYK-2a interlocked with the relay RYK. when a diode for charging the capacitor of the rectification power (D ₁₎ (C ₃₎ and said capacitor (C ₃₎ being driven by the terminal voltage of the relay contact (RH-2a) (RYK- 1a) relay connected Transistors for woman (RYH) (Q ₁₎ and, in conjunction with the relay works on (RYH), and a heater in series connection in which the relay contact (RYH-1a) to (H ₁₎ and the relay (RYC) (RC), and frozen A power supply circuit for a vending and vending machine consisting of a relay contact (RYC-1a) (RC-3b) connected to a unit (5).