KR880002287Y1 - Heater control apparatus of clothing dryer - Google Patents

Abstract

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Description

Heater control device of clothes dryer

1 is a circuit diagram of the present invention.

2 is a rectified voltage waveform and an applied current waveform diagram of the present invention.

3 is an exhaust port temperature graph of the present invention.

4 is a graph of the present invention and the conventional clothes dryer exhaust outlet temperature.

5 is a circuit diagram of a conventional clothes dryer.

* Explanation of symbols for main parts of the drawings

1: power 2: door switch

3: Timer 4, 5: Timer contact

6: motor 7: diode

8: inductor 9: exhaust thermostat

10, 11: Heater 12: Heater weak selection switch

13: condenser 14: temperature fuse

15: heater thermostat

The present invention relates to a heater control apparatus for a clothes dryer that senses a temperature of an exhaust port of a clothes dryer and adjusts a voltage applied to the heater to control the heat output of the heater itself.

In the conventional dryer control method, the power supply itself applied to the heater is turned on and off by sensing the exhaust temperature.

The initial inrush current of the heater usually flows 3 to 4 times that of normal operation. The frequency of initial inrush current increases due to frequent on / off of the power supply, and the initial power consumption also reaches 3 to 4 times that of normal. This also increases the number of times the initial power consumption consumed. In addition, there is a drawback that the life of the heater is shortened in proportion to the number of ON-OFF times of the power supply.

The present invention is to solve the above-mentioned shortcomings. When the temperature of the exhaust port is below the set value, the power supply voltage is applied to the heater as it is, and when the temperature exceeds the set value, the power supply voltage is half-wave rectified and the DC voltage is applied to the heater through the LC filter, which is a smooth circuit. If described in detail by the accompanying drawings as follows.

According to the present invention, the motor 6 is connected to the contact 4 of the timer 3 connected to the power source 1 through the door switch 2, while the contact 5 of the other timer 3 is provided. 1 The heater 10, the heater thermostat 15 and the temperature fuse 14 is connected in series, but the second heater 11 and the heater weak select switch connected in series between the terminals of both sides of the first heater 10 In the heater control apparatus of the clothes dryer (12) connected in parallel, the diode (7) and the inductor (8) connected in series are connected in parallel with the exhaust thermostat (9) of the timer contact (5) A condenser 13 is connected between the one terminal a and the one terminal b of the first heater 10, and between the first heater 10 and the heater thermostat 15 connected in series as described above. It is configured to connect in parallel.

In the circuit diagram of FIG. 1, when the exhaust temperature is lower than the set value, the thermostat 9 is in an ON state and is directly connected to the heater 10 and 11 without being affected by the diode 7, the inductor 8, and the capacitor 13. . However, if the exhaust port temperature is higher than the set value, the thermostat is turned off, and the power supply is half-wave rectified by the diode 7.

The power is smoothed by the inductor 8 and the condenser 13 like the second degree, and is applied to the heaters 10 and 11.

Compared with the heating value at this time

Q is the calorific value, K is the constant, the effective value of the applied voltage, and R is the resistance.

If the effective value of the normal applied voltage is V₁ the heating value is Q ₁ and the effective value of the half-wave rectified voltage is V ₂ , the heating value at this time is Q.

ego

here

T is a period and Vm is the maximum value of the applied voltage.

In other words, when the half-wave rectified voltage is applied, the amount of heat generated by the heater is reduced to 1/2, thereby preventing the temperature rise in the drum and maintaining a constant temperature, and also maintaining the temperature of the exhaust port.

The temperature of the exhaust port increases gradually as the object to be dried closes. By the above principle, the heating value of the heater is controlled so as not to exceed the set value of the exhaust port temperature, thereby preventing the waste of heat discharged through the exhaust port.

According to the principle described above, the heating value of the heater is changed due to the change of the voltage applied to the heater, so there is no need to turn the power on and off, and there is no initial inrush current and no initial power consumption. Since the heat generation amount is only changed, but the power of the heater is not cut off as in the conventional art as in FIG. 5, the conventionally shown by the dotted line as shown by the solid line in FIG.

Claims (1)

Clothing consisting of a door switch 2, a timer 3 with contacts 4 and 5, a motor 6, a heater 10 and 11, a heater thermostat 15 and a temperature fuse 14 In the dryer's heater control apparatus, an exhaust thermostat 9 that is turned on or off as the exhaust temperature falls below or exceeds a set range, and a power supply voltage is rectified when the exhaust thermostat 9 is turned off. And a smoothing circuit composed of an inductor 8 and a condenser 13 to smooth the half-wave rectified voltage supplied through the diode 7 and apply it to the heaters 10 and 11. Heater control device of the clothes dryer, characterized in that for controlling the heating value of the heater.