KR900007091Y1 - Control circuit for pumping installation - Google Patents

Abstract

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Description

Freezing of the fully automatic pump and overheat protection circuit of the motor

1 is a circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

1: motor temperature sensing unit 2: comparison control unit

3: gate combination 101: trance

102: bridge rectification diode 103: motor

104: heater 105: constant voltage circuit

106: Thermistor 107,108: Comparator

109, 110: Noah gate 111: light emitting diode

112, 113: Relay 112S, 113S: Relay switch

R1 ~ R20: Resistor Q1 ~ Q3: Transistor

C1 ~ C3: Capacitor SW1: Reset Switch

D1, D2: Back EMF Prevention Diode

The present invention relates to a circuit for freezing of a fully automatic pump and an overheat protection circuit of a motor, and more particularly to a circuit for visually notifying a state of overheating of a motor and preventing freezing and freezing in winter.

In the related art, when a fully automatic pump is driven for a long time, the motor is overheated and the degree of heating thereof is not known accurately, which causes a burden on the circuit and shortens the life of the product. In particular, in the winter, the automatic pump has a low ambient temperature. There were problems such as freezing and freezing, and the present invention was devised to improve the above problems. The thermistor is installed in the motor to detect the temperature of the motor and notify the operator as a light emitting diode when it overheats. To prevent the freezing and freezing in advance to detect the circuit configuration will be described below according to the accompanying drawings.

FIG. 1 shows a circuit for preventing the freezing of the automatic pump and the overheating of the motor according to the present invention, wherein AC power is applied to the motor 103 and the heater 104 via the relay switches 112S and 113S. The transformer 101, the bridge rectifier diode 102 and the constant voltage circuit 105 is applied to the thermistor 106 of the motor temperature sensing unit 1, the thermistor 106 is attached to the motor 103 to It is to sense the temperature and the ambient temperature, one end is connected to the grounded capacitor (C1) and the resistor (R1) and at the same time connected to the resistor (R2) (R9), the resistor (R2) is the input terminal of the comparator (107) +), Resistor R9 is connected to the inverting input terminal (-) of the comparator 108, and the inverting input terminal (-) of the comparator 107 is connected to the output terminal of the constant voltage circuit 105 via the resistor R3. And the non-inverting input terminal (+) and one end of the comparator 108 are connected to the grounded resistor R5 at the same time through the resistor R4 The output terminal of the group 107 is connected to its non-inverting input terminal (+) via a resistor R6 and simultaneously connected to the noar gate 109 input terminal of the gate combination section 3, and the output terminal of the comparator 108 is a resistor. (R10) is connected to its non-inverting input terminal (+) and at the same time is connected to the output terminal of the constant voltage circuit 105 through a resistor (R11), and also through the resistor (R12) and the resistor (R13) whose one end is grounded the emitter Is connected to the base of the transistor Q1 connected to the ground, and the relay 113 and the diode D2 are connected in parallel to the collector of the transistor Q1, and are connected to the output terminal of the constant voltage circuit 105 and the gate combination circuit portion ( The output terminal of the noble gate 109 of 3) is connected to one end of the grounded capacitor C3, and then connected to one input terminal of the noble gate 110 via a resistor R7, and at the same time, via a reset switch SW1. 105 is connected to an output terminal, and the type force terminal of the noble gate 110 is one After being connected to the grounded resistor R8, it is connected to the output terminal of the constant voltage circuit 105 via the capacitor C2, and the output terminal of the noah gate 110 is connected to the type force terminal of the noah gate 109 and at the same time the resistance ( Ground connected via R15 and the light emitting diode 111, and connected to a resistor R17 whose one end is grounded through a resistor R16, and an emitter connected to the base of the transistor Q2 grounded. The collector of the transistor Q2 to which the power supply voltage Vcc is applied through the R18 is connected to the base of the transistor Q3 to which the emitter is grounded through the resistor R19 and grounded through the resistor R20. The collector of the transistor Q3 has a configuration in which the power supply voltage Vcc is applied through the relay 112 and the diode D1. The operation state, action, and effect thereof will be described with reference to the accompanying drawings.

In FIG. 1, when AC power is initially applied, the constant voltage Vcc is applied to the thermistor 106 through the transformer 101, the rectifier 102, and the constant voltage circuit 105. The capacitors C1 and C2 are short-lived and charged in a short time due to their characteristics. Therefore, when the power supply is initially applied, the voltage at the point a through the thermistor 106 is momentarily low (“-of capacitor C1”). "O [V] because the terminal is on the ground) and then a certain voltage Vcc The voltage at the point f by the capacitor C2 is also maintained in the high state when the capacitor C2 is short-circuited, and remains high when the capacitor C2 is charged. Keep it.

Therefore, first, when the instantaneous low state of the point a, the low voltage is applied to the inputs of the comparators 107 and 108 of the comparison control unit 2, respectively, and the voltage of the point c point c which is the voltage distribution of the constant voltage Vcc. Since the instantaneous point a voltage O [V] is smaller than the point b (or point c) voltage, the comparator 107 outputs a low signal so that the low voltage is output at the d point. An output of 108 outputs a high signal so that a high voltage is output at point e.

According to the above, the low output signal at the d point has a low point voltage at the initial voltage state, and therefore a high signal is output at the g point which is the output of the NOA gate 109.

Then, when the point g is high (initial power-up state), the capacity f of the capacitor C2 is larger than the capacity of the capacitor C1 and the full charge of the capacitor C2 is maintained. If it is possible to make the time slightly longer than the capacitor C1, the output of the NOA gate IC4 becomes low when the point f is high when the point g is high, and a low voltage is applied to the point h, and the light emitting diode 111 And the transistor Q2 are turned off so that the constant voltage Vcc is applied to the base of the transistor Q3 via the resistors R18 and R19, so that the transistor Q3 is turned on to allow the relay 112 to drive. do. When the point e is high, the transistor Q1 is driven to operate the relay 113.

In this way, when the initial power is applied, the relays 112 and 113 are driven by a momentary short state of the capacitors C1 and C2, and the switches 112S and 113S of the relays 112 and 113 are short-circuited. Therefore, the motor 103 and the heater 104 are driven respectively.

However, if the motor 103 becomes overheated due to long time use of the fully automatic pump, the resistance value of the thermistor 106 of the motor temperature sensing unit 1 installed in the motor 103 decreases (because the thermistor 106 is an element having NTC characteristics). , the point a voltage is a constant voltage (Vcc) is a divided voltage between the resistance of the thermistor 106 and the resistance (R1), so it is maintained in a high state and applied to each of the comparators 107, 108, and in the comparator 107 The voltage at point a and the point b of the high state are compared, where the point b voltage is lower than the point a voltage when the motor is overheated by adjusting the resistance (R3, R4, R5) (b <a). Therefore, the comparator 107 attempts to output a high signal, and since the c point voltage is lower than the b point voltage due to the voltage drop caused by the resistor R4, the a point voltage applied to the inverting input terminal (-) of the comparator 108 is non- Since signal c is greater than the point c voltage applied to the inverting input terminal (+) (c <a) Since the transistor Q1 and the relay 113 are turned off by the low signal at the point e and the relay switch 113S is turned off, the heater 104 is turned off and at the same time the high signal at the point d, which is the output of the comparator 107, The point g is brought low through the noah gate 109 of the gate combination part 3.

The low signal at point g is combined by the NOA gate 110 together with the low signal at point f (since capacitor C2 is in a full charge state) to output a high signal at its output so that point h becomes high so that the light emitting diode 111 ), The overheat state of the motor 103 is visually displayed, and the transistor 112 is turned off because the transistor Q2 is driven to turn off the transistor Q3.

At this time, even if the h point voltage changes from low state to high state, d point is high state, so g point becomes low state by combination of noah gate, and the same operation as above occurs. It will remain low.

As the relay 112 is turned off, the relay switch 112S is turned off and the motor 103 is turned off. After removing the cause of overheating of the motor, the g-point becomes high when the reset switch SW1 is connected. Since the low point h is low, the light emitting diode 111 and the transistor Q2 are turned off, and the transistor Q3 is turned on so that the motor 103 operates by the operation of the relay 112 so that normal operation is possible. .

In winter, the ambient temperature is too low, which may cause freezing and freezing of the automatic pump. In this case, the resistance value of the thermistor 106 becomes high so that the voltage at point a is lower than the voltage at point c (a < c) and the output of the comparator 108 becomes high to drive the transistor Q1 while driving the relay 113 so that the relay switch 113S is turned on to operate the heater 104.

On the other hand, the output state of the comparator 107 is in a low state because the a point voltage is lower than the b point voltage, and the motor operates as described above.

Therefore, the freeze-up of the automatic pump and the overheat protection circuit of the motor according to the present invention emits a light emitting diode when the motor is overheated as described above, informing the user of the excessive operation state of the motor, and automatically turns off the motor as well as winter When the temperature drops too much, the heater is automatically operated to prevent freezing and freezing of the product, thereby protecting the product and extending the life.

Claims (1)

An AC power source AC is applied to the motor 103 and the heater 104 and simultaneously applied to the transformer 101, the bridge rectifier diode 102 and the constant voltage circuit 105. The motor temperature sensing unit 1 using the thermistor 106 is connected to the output terminal to apply the temperature of the motor detected by the thermistor 106 to the comparators 107 and 108 input terminals of the comparison control unit 2, respectively. The output signal of the comparator 107 is applied to the gate combination part 3 composed of the noar gates 109 and 110, the reset switch SW1, and the capacitors C2 and C3, and emits light at the output of the noar gate 110. By controlling the diode 111 and the relay 112 of the motor 103 to visually indicate the overheating state of the motor and to automatically turn off the motor. The output signal of the comparator 108 controls the transistor Q1 to control the heater. Control the relay 113 of 104 to prevent freezing and freezing of the product A circuit for freezing the motor and overheating the motor, characterized in that the automatic pump.