KR0120277Y1 - Control circuit for ventilation motor of coffee vending machine - Google Patents

Abstract

The present invention relates to a control circuit for adjusting the operation of the exhaust fan to remove moisture inside the coffee machine. More specifically, the present invention relates to a control circuit for controlling the exhaust fan drive motor for rotating the exhaust fan of the coffee machine, which operates 24 hours, to selectively rotate only when the coffee machine is operated to sell coffee.

The coffee vending machine exhaust motor control circuit includes a power supply unit for supplying DC24V and DC8V voltages, an exhaust motor PCB for controlling the exhaust motor, an exhaust motor, and a coffee vending machine main control unit. It is characterized in that it further comprises an exhaust motor power control unit installed between the exhaust motor PCB and operated for a predetermined time by a control signal output from the main controller of the coffee machine.

Description

Coffee Vending Machine Exhaust Motor Control Circuit

1 is a schematic block diagram of a coffee machine exhaust motor control circuit conventionally used;

2 is a schematic block diagram of a coffee machine exhaust motor control circuit according to the present invention,

3 is a circuit diagram of an exhaust motor power control unit of FIG. 2 according to the present invention;

4 (a) is a waveform diagram showing the operating time of the coffee machine after the coin is put into the coin mechanism of the coffee machine,

(b) is a waveform diagram of the voltage output from the main control unit to the exhaust motor control unit during coffee sales;

5 is a flowchart for explaining an exhaust motor control operation according to the present invention.

* Explanation of symbols for main parts of the drawings

2: power unit 4: coffee vending machine

6: exhaust motor PCB 8: exhaust motor

10: exhaust motor power supply control unit Q1, Q2, Q3, Q4: transistor

R1, R2, R3, R4, R5, R6, R7, R8: Resistance

The present invention relates to a control circuit for adjusting the operation of the exhaust fan to remove moisture inside the coffee machine. More specifically, the present invention relates to a control circuit for controlling the exhaust fan drive motor for rotating the exhaust fan of the coffee machine, which operates 24 hours, to selectively rotate only when the coffee machine is operated to sell coffee.

When the vending machine user selects the desired coffee by pressing the select button, this selection signal is input to the main control section, which operates the valve and motor drive according to the pre-built corresponding program data to mix the stored coffee powder, cream powder and hot water. After mixing in the negative portion, it is supplied through a nozzle to a pre-positioned paper cup. The program data determines, for example, the input amount of coffee (or a corresponding powder raw material), cream, hot water, etc. according to selection of milk coffee, black coffee, or yulmu tea.

Although not shown, the mixing part is generally in the shape of a funnel, and is configured to be immediately mixed when coffee (or the corresponding powder raw material), cream, water, and the like are injected at the same time. In addition, a nozzle is connected to the lower end of the mixing section, and the mixed liquid discharged through the nozzle (i.e., coffee peanut tea or yulmu difference) is supplied to the paper cup.

Conventional coffee vending machines use hoses, etc., extending from storage tanks to induce hot water to the mixing unit that mixes hot water, cream, and coffee powder. Water is always used, and powder is used, such as coffee or prim. Therefore, mold will grow in the powder of coffee or prim due to moisture for a long time. Conventionally, an exhaust fan was used to dry the inside of the coffee machine. That is, the exhaust fan was driven for 24 hours regardless of coffee sales to circulate the internal air to remove moisture in the vending machine.

Shown in FIG. 1 is a schematic block circuit diagram of a coffee machine exhaust motor controller conventionally used, which includes a power supply unit 2, a coffee machine main controller 4, an exhaust motor PCB 6, and an exhaust motor 8. It includes.

The power supply unit 2 supplies a predetermined voltage used for the exhaust motor 8 that rotates the exhaust fan (not shown). The power supply unit 2 typically uses DC24V and DC8V, for example, and the scope of the present invention. You will see that it belongs to. The power supply unit 2 operates by a signal input from the main vending machine 4 of the coffee machine. In the related art, the power supply unit 2 is connected to supply power automatically when commercial power supply 110V / 220V is supplied. The DC voltage output from the power supply unit 2 is directly applied to the exhaust motor PCB 6 to drive the exhaust motor 8.

However, by continuously operating the exhaust motor for 24 hours, power consumption increased, which became a factor of energy waste. In addition, there are problems such as deterioration of components of the driver circuit, reduction of life of the exhaust motor, and noise generated by driving the exhaust motor.

The present invention has been made to solve the above problems, the object of the present invention is to drive the exhaust motor only when the coffee sales to extend the life of the exhaust motor, increase the reliability of the fan drive, power consumption is reduced, The present invention provides a coffee machine exhaust motor control circuit which reduces noise.

Coffee machine exhaust motor control circuit of the present invention for achieving the above object is a coffee comprising a power supply unit for providing a DC 24V and DC8V voltage, an exhaust motor PCB for controlling the exhaust motor, an exhaust motor, and a coffee vending machine main control unit The vending machine may further include an exhaust motor power control unit installed between the power supply unit and the exhaust motor PCB and operated for a predetermined time by a control signal output from the main controller of the coffee machine.

Hereinafter, an exhaust motor control circuit of the coffee machine of the present invention will be described in detail with reference to FIGS. 2 to 5.

FIG. 2 is a schematic block diagram according to the present invention, and compared with FIG. 1, an exhaust motor power control unit 10 is further provided between the power supply unit 2 and the exhaust motor PCB 6. The exhaust motor power control unit 10 serves as a switch that operates temporarily according to a control signal (voltage signal) output from the main controller 4 of the coffee machine. That is, when a predetermined control signal is input, it is operated to supply the power applied from the terminals A, B, and C of the power supply unit 2 to the corresponding terminals A ', B', and C 'of the exhaust motor PCB 6. do.

The control signal for adjusting the exhaust motor power control unit 10 is output from the coffee vending machine main controller 4. The main controller 4 recognizes the coin when the coin is input through the coin inlet and outputs a control signal to operate the exhaust fan, and after the coin is thrown into change and the sale is finished, the exhaust fan for a predetermined time. After further driving, output a control signal to stop the operation of the exhaust fan. This operation can be easily accomplished by conventional control techniques.

3 is a detailed circuit diagram of the exhaust motor control unit of FIG. 2 according to the present invention. As shown, the first transistor Q1 and the first transistor Q are connected to respective terminals A, B, and C (voltage applied to 24 V, DC 8 V, and 0 V, respectively). The second transistor Q2 and the plurality of voltage divider resistors R1, R2, R3 and R4, the third transistor Q3 and the fourth transistor Q4 for driving the first transistor Q1 and the second transistor Q2. ) And a plurality of voltage divider resistors R5, R6, R7, and R8, and the last terminal C is grounded.

The terminal A of the power supply unit 2 is connected to the emitter e of the first transistor Q1, and the two voltage divider resistors R1 and R3 are connected to the base b. In addition, the collector C of the first transistor Q1 is connected to the conventional exhaust motor PCB 6. The voltage divider R3 connected to the base b is connected to the collector C of the third transistor Q3, which is a driving transistor, and the emitter e of the third transistor Q3 is grounded. The voltage divider R5 and R7 are connected to the base b of the third transistor Q3, and the base b is connected to the main controller 4 of the conventional coffee machine. In this way, when the first transistor Q1 operates, DC 24V is supplied.

The terminal B of the power supply unit 2 is connected to the emitter e of the second transistor Q2, and two voltage divider resistors R2 and R4 are connected to the base b. In addition, the collector C of the second transistor Q2 is connected to the corresponding terminal of the conventional exhaust motor PCB 6. The voltage divider R4 connected to the base b is connected to the collector C of the fourth transistor Q4, which is a driving transistor, and the emitter e of the fourth transistor Q4 is grounded. The voltage divider R6 and R8 are connected to the base b of the fourth transistor Q4, and the base b is connected to the main controller 4 of the conventional coffee machine. In this way, DC 8V is supplied through the second transistor Q2.

In the present invention, for example, 2SC185Y may be used for the first and second transistors Q1 and Q2, and for example, 2SB1367Y and third and fourth transistors Q3 and Q4. In addition, the terminal C is a grounding terminal.

An operating state of the exhaust motor power control unit 10 according to the present invention having the above configuration will be described with reference to FIGS. 4 and 5. (A) of FIG. 4 is a waveform diagram of the time indicating the operation time of the coffee machine after a coin is put into the coin mechanism of the coffee machine, and (b) is a waveform diagram of the voltage output from the main control part to the exhaust motor controller at the time of coffee sales. Will be shown respectively.

When power is supplied to the coffee machine and is in the stand-by state for sale, since the coin is not input to the coffee machine main controller 4, the control signal is not output, so that the exhaust motor power control unit 10 is inoperative and the exhaust motor PCB 6 The exhaust motor 8 does not rotate because no power is supplied.

When a coin is input, this is sensed, and the main machine part 4 of the coffee machine outputs a control signal to prepare for sale. When the selection button of the desired coffee is input, the main control unit 4 outputs a driving signal to prepare the corresponding coffee, and supplies hot water to the mixing unit to supply hot water, coffee, and cream powder, and provides a coffee by positioning the paper cup. . The main controller 4 outputs a separate control signal through the terminal G at the same time as the sale control signal when the input of the coin is detected. This control signal is a high (H) signal, as shown in FIG. At this time, the output voltage becomes a time t2 which is slightly delayed than the time t1 when the coin is put.

When the control signal H output from the main controller 4 of the coffee machine is input, the third transistor Q3 and the fourth transistor Q4 are turned on. At this time, since power is supplied through the terminals A and B of the power supply unit 2, the first transistor Q1 and the second transistor Q2 are also turned on to apply the DC voltage. Accordingly, a predetermined voltage (24 V through the A terminal and 8 V through the B terminal) is applied to the exhaust motor PCB 6, and the exhaust motor 8 is driven to rotate the exhaust fan.

When the sale is stopped at a certain time t3 after a predetermined time has elapsed, the coffee machine main controller 4 starts a timer from the time at which the sale is stopped to count the time. After a certain time has elapsed, the coffee vending machine main controller 4 outputs a control signal continuously output through the terminal G as a low L signal. If the coin is re-injected while the timer is running, the coffee vending machine main controller 4 stops the ongoing stroke and regards it as a new input from the time when the coin is put and outputs a new control signal through the terminal G. .

As described above, when the low signal is output, the third transistor Q3 and the fourth transistor Q4 are turned off, and accordingly, the first transistor Q1 and the second transistor Q2 are also turned off. The supply of the voltage applied from (2) is cut off. Therefore, the voltage supplied to the exhaust motor PCB 6 is cut off, and the rotation of the exhaust motor 8 is stopped. However, according to the present invention, since the voltage is further supplied through the terminal G for a predetermined time, the rotation of the exhaust motor 8 lasts for a predetermined time. It is counted by a timer at a set time period from an arbitrary time t3 to a predetermined time t4. The timer may be used by embedding a timer in the main machine 4 of the coffee machine or using a separate external timer, which will be apparent to those skilled in the art. The set time (t4-t3) can be arbitrarily determined, and it is preferable to change it to remove moisture most efficiently according to the environment in which the coffee machine is installed.

As described above, according to the present invention, since the exhaust fan rotates only when coffee is sold, the life of the exhaust motor and the reliability of the fan drive unit are increased, the power consumption is reduced, the energy saving effect is reduced, and the noise is significantly reduced. There is an advantage.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that the present invention may be modified or changed within the spirit and scope of the present invention. Should be limited.

Claims (1)

An output of the exhaust motor PCB 6 having a power supply unit 2 having terminals A and B for supplying a predetermined DC voltage, a terminal for receiving a voltage from the power supply unit 2, and an output of the exhaust motor PCB 6. In a coffee machine including an exhaust motor 8 that is controlled by a voltage and drives an exhaust fan, and a coffee vending machine main controller 4, it is provided between the power supply unit 2 and the exhaust motor PCB 6. The emitter e of the first transistor Q1 is connected to the terminal A of the power supply unit 2, the two divided resistors R1 and R3 are connected to the base b, and the first transistor Q1. ) Is connected to the exhaust motor PCB (6), the other end of the voltage divider (R3) is connected to the collector (C) of the third transistor (Q3) driving transistor, and the third transistor ( The emitter e of Q3) is grounded, the voltage divider resistors R5 and R7 are connected to the base b, and the base b is connected to the main controller 4 of the coffee machine. The emitter e of the second transistor Q2 is connected to the terminal B, the two voltage divider resistors R2 and R40 are connected to the base b, and the collector C of the second transistor Q2 is exhausted. The voltage divider R4 is connected to the collector C of the fourth transistor Q4, which is a driving transistor, and the emitter e of the fourth transistor Q4 is grounded. The voltage divider R6 and R8 are connected to the base b of the fourth transistor Q4, and the base b is connected to the terminal G of the main controller 4 of the coffee machine. A coffee machine exhaust fan control circuit further comprising a grounded exhaust motor power control unit (10).