KR200313094Y1 - A check apparatus of electric mat - Google Patents

Abstract

This design makes it easy to determine whether the temperature controller is faulty or the mat is faulty at the time of A / S when the electric mat is not hot in the homes of ordinary people who do not have knowledge of electricity and electronics. It is a discriminating device that can reduce the time for troubleshooting and benefit both the manufacturer and the user (consumer) by allowing only parts to be repaired.

Description

Fault checker of electric mat {A check apparatus of electric mat}

The present invention is a failure determination device of the electric mat which is used most frequently by the people of Korea as an auxiliary heating device, and when the consumer breaks down using the electric mat, the consumer wants a quick A / S. As the volume is very large, it calls the parcel delivery service and requests A / S to the manufacturer or distributor. The manufacturer analyzes the cause of the failure of the electric mat and sends it to the consumer by using parcel delivery after repair.

This is a time-consuming and expensive result. If a customer diagnoses the problem to some extent and requests after-sales service, it can save time and money.

In general, the mat is made of a mat body and a temperature controller, but if the mat is not hot, the consumer cannot determine whether the mat side is broken or the thermostat is broken.

For example, if a failure occurs.

① Malfunction of electric mat, temperature controller is normal

② Electric mat is normal, temperature controller is broken

③ Electric mat failure, temperature controller failure

The above three cases occur, but in case of ③, the consumer requests both A / S for electric mat and temperature controller, but in case of ① or ②, only A / S is needed. If only the electrical mat requests A / S, it can reduce the logistics and cost.

However, most consumers do not have electrical and electronic knowledge, but they do not know the wiring diagram of the mat and do not have to disassemble it.

The present invention focuses on this point, and when an electric mat is sold, an electric mat failure discriminator is provided so that the consumer can easily determine whether the electric mat is broken when the electric mat is broken, so that the abnormality of the mat in the electric mat failure discriminator can be solved. If not, the purpose is to reduce logistics and costs by requiring only A / S for a small temperature controller without sending a bulky electric mat.

Once the mat fails, the consumer requests both A / S for the mat and the adjuster. If the mat is bad, the adjuster is small in volume, so even if both send A / S, the logistics and cost will be the same. Even without this, the consumer will ask for after-sales service for both the mat and the regulator, which will cost a lot of time and money for logistics, and both the manufacturer and the consumer will lose money.

Thus, the present invention is a method that allows the consumer to determine whether the failure of the bulky electrical mat side can be a better quality A / S.

In general, the electric mat is divided into a mat and a temperature controller (Fig. 1), and the present invention is a device that detects an abnormal cloud of the mat. ), The temperature sensing unit 30, and the temperature rise prevention unit 40.

① First of all, the abnormality of the heating unit 50 refers to disconnection. When the heating unit is disconnected, it means a failure in which heat is not generated because power is not supplied.

② The failure of the temperature increase prevention part 40 is a failure similar to the disconnection of the heat generating part because it is made in series with the heating wire when the contact failure is sometimes abnormal due to the abnormality of the bimetal or the return is not performed after the operation.

③ If the temperature sensor 30 is disconnected, the temperature sensor used in general is composed of NTC, called thermistor. The resistance of the heater changes as the temperature rises in the heating part. The temperature rises without temperature control, and the bimetal, a thermal protector connected in series to the heating wire, continues to operate, resulting in bimetal failure. In some cases, thermistor disconnection is used in high-end thermostats. In some cases, a circuit for determining the power supply to the heating wire may be interrupted.

In any case, the disconnection of the surge can be categorized as a failure in which the temperature rises or the power supply is interrupted without temperature control.

④ When the temperature sensing unit 30 is short

When the thermistor is short, NTC is usually used as described above. As the temperature increases, the resistance decreases, and the temperature controller detects it and controls the temperature. When the thermistor is short, the resistance value is almost 0Ω. The temperature is high, and the internal circuit of the temperature controller determines that the power supply to the smoke line is cut off, and the overall temperature does not rise.

In the end, as described above, the failure is largely classified into three types, such as disconnection of the heating part or disconnection or short of the temperature sensing part. Therefore, the present invention provides a failure determination device for easily identifying the failure.

1 is a view schematically showing the configuration of an electric mat

2 is a view showing an internal configuration of a heating mat 1

3 is a view showing the internal configuration of the two heating electric mat

4 is a heating circuit diagram of the present invention

5 is a block diagram of the present invention

6 is a heating circuit diagram 2 of the present invention

7 is a circuit diagram of the display unit of the present invention

[Description of Symbols for Main Parts of Drawing]

10: development mat 20: temperature controller (temperature controller) 30: temperature detection unit (thermistor) 40: temperature overheat prevention unit (bimetal)

50: heating unit (heating wire) 60: sensor

100: connector 110: disconnection detection unit

120: short detection unit 130: display unit

140: power supply unit 200: disconnection display unit 300: short display unit

Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, Figure 2 is a view showing the internal configuration of the one heating electric mat, Figure 3 is a view showing the internal configuration of the two heating electric mat, Figure 4 is a heating circuit diagram of the present invention, Figure 5 is a block diagram of the present invention 6 is a circuit diagram of the heating unit of the present invention, and FIG. 7 is a circuit diagram of the display unit of the present invention, and the present invention is connected to the heating wire in series to determine whether the heating wire and the temperature sensing thermistor are disconnected. The comparator IC1 for detecting the disconnection by comparing the set voltage value of the circuit with the changed voltage value during disconnection, the display unit L1 connected to the output of the comparator IC1 to display a disconnection display, and connected in series with the temperature sensing thermistor. The comparator IC2 which detects the presence of a short by comparing the set voltage value of the circuit with the changed voltage value at short, and is connected to the output of the comparator IC2 to display a short display. L2 is composed of a display to display.

In particular, the failure detection device of the mat is a comparator IC1 for detecting the disconnection of the heating wire and a comparator IC2 for detecting the disconnection and short of the temperature sensing thermistor are connected in series to the heating wire and the thermistor, respectively, to simultaneously detect the disconnection of the heating wire and the temperature sensing thermistor. It can be detected.

Figure 4 is a basic circuit diagram of the present invention will be described in detail with reference to FIG.

As shown in Figure 4, the user connects the device to the mat's connector and operates when the power switch (SW) is turned on. As shown in Fig. 4, the consumer connects the device to the mat's connector 100 instead of the thermostat. When the connection is made and the power switch (SW) is turned on (ON), the LED of the display unit 130 is turned on when the mat unit is abnormal, the operation is as follows.

① Two cases of normal and non- settlement

② disconnection of the heating unit 50 or the temperature sensing unit 30

③ Two cases of the short time detection section 30 will be described.

① For reference, the heating part 50 of the electric mat usually uses several tens of ohms (Ω) and hundreds of ohms (Ω), and the high temperature sensing unit 30 boots this thermistor from several kilo ohms to several tens of kiloohms. Although the heater resistance of the heating unit 50 does not vary according to the change of the ambient temperature due to seasonal (summer-winter) factors, the thermistor has a large range of change.

First, in case of normality, the disconnection detecting unit 110 and the + side attraction of the IC1 set the voltage that is normally placed than the -input (+ and-side may be changed, but the + side is high voltage) terminal. In this case, when the circuit is in operation, the current flows in the order of + → R1 → D1 → Connector → H1 → H2 → S2 → S1 →-and the high resistance is set in R1. It becomes high and LED 1 of the display unit 130 does not operate.

In the case of comparator IC2, the input terminal and the low voltage divided by R6 and R7 are set so that the voltage through R5 is normally applied to the + side, and the output is always high because the + side is high. In the normal state, the + input of IC2 is always higher than the minus input, so the output becomes high and the LED of the display unit 130 does not light. In addition, the high voltage is not introduced into the comparator IC1 by the disconnection detecting unit 110 diode D1.

When disconnection of the heater or sensor occurs, the current flows in the order of + → R1 → D1 → Connector → H1 → H2 → S2 → S1 →-and the voltage of the power supply unit remains as shown in the display unit 130. Through the input terminal of the comparator IC1, the voltage on the input side becomes higher than the voltage set on the + side, so that the output is high to low, and the LED1 of the display unit 130 turns on. At this time, the + side input of the comparator IC2 is higher than the-side, so that the IC2 does not operate.

The following is the case of the short of the temperature sensing unit 30 thermistor. In this case, as described above, the failure of power supply to the heating wire is explained.

First, in the case of the comparator IC1, when the sensor is shorted, the voltage between the resistor R1 and the diode D1 is further lowered, but since the input of the comparator IC1 of the disconnection detecting unit 110 is still higher than the-side, the output is It becomes high (H) and the display unit 130 LED 1 does not light. At this time, the + side input voltage of comparator IC2 flows in the order of + → R5 → S2 → S1 →-. When the temperature sensing unit 30 is shorted with the thermistor, the resistance is close to 0Ω, so the + input voltage of IC2 is 0V. The output is high (H) → low (L) is closer to the lower than the set-side voltage is turned on, LED 1 of the display unit 130 is to be determined to be a failure.

In any case, the user may determine whether the mat is broken once the heating unit 50 heater or the temperature sensing unit 30 thermistor is disconnected or the thermistor is short so that the user may request A / S.

If it is desired to determine whether a short or disconnection is a more convenient method, the disconnection display unit and the short display unit may be installed as shown in the block diagram of FIG. 5.

2 In the case of heating, the principle is the same as in the case of heating 1, but the circuit configuration is different, so that the heating unit and the temperature sensing unit are separately diagnosed.

Referring to the circuit diagram of FIG. 6, when the user connects the device to the mat instead of the temperature controller and turns on the power switch SW, the resistor R4 is applied to the + input terminal of the comparator IC1 connected to the heating unit 50. Set high voltage with and R10. -Set voltage of input side is + → R3 → H1 → HC → H2 →-and current is flowed in order, and usually set R3 to be lower than +1 input voltage of IC1.

Then, under normal condition, the + input of IC1 is higher than-input voltage, so the output of comparator IC1 becomes H and L1 does not light up.

If the heating wire is disconnected, the power supply voltage is directly input to the negative side of the comparator IC1 through the resistor R3. Therefore, the output voltage of the comparator IC1 becomes high (H) to low (L). 130) LED 1 turns on to detect a fault.

The failure of the temperature sensing unit 30 is classified into two types, a disconnection and a short. In the case of the comparator IC2, the short circuit operates in the case of a short.

In the normal case, if-input voltage of comparator IC2 is set low, + input voltage is in order of + → R5 → D1 → S1 → SC →-or + → R5 → D2 → S2 → SC →-even if there is other change in ambient temperature. The output is always high because the + input is always high.

At this time, comparators (IC3, IC4) for detecting disconnection of the sensor are simultaneously connected through diodes (D3, D4). Both comparators (IC3, IC4) are set to the same high voltage as on IC1.

In addition, since the voltage on the negative side is connected to the terminals of the sensors S1 and S2 through the diodes D3 and D4 through the resistors R8 and R9, the voltage is always lower than the + input even when the ambient temperature is changed. When the resistors R8 and R9 are set so that the comparators IC3 and IC4 always have the + input higher than the-input, the output becomes high (H) and the LED of the display unit 130 does not operate.

At this time, if the temperature sensor S1 or S2 is in a short state, the negative input voltage of the comparator IC2 is short. If the sensor S2 is in a short state, the negative input voltage of the comparator IC2 is + → R5 → D1 → S1 → SC. The end gate is connected in the order →-or + → R5 → D2 → S2 → SC →-and the resistance is close to 0Ω no matter which short, so the voltage on the + side of the comparator IC2 approaches 0V. Since the voltage becomes lower than the -input set voltage of IC2, the output becomes high (H) to low (L), so that the LED 130 of the display unit 130 lights up to diagnose the failure. At this time, since the negative side input voltage of the comparators IC3 and IC4 becomes even lower, the positive side voltages of the IC3 and IC4 continue to be higher than the negative side and thus do not operate.

If one or both of the temperature sensor thermistors (S1 or S2) are disconnected, the + input voltage of comparator IC2 is always higher than -input voltage even if only one thermistor is disconnected or both are disconnected. In the case of comparators (IC3, IC4)

For IC3, go to + → R8 → D3 → S1 → SC →-

In the case of IC4, current flows in the order of + → R9 → D4 → S2 → SC → -.If the temperature sensing thermistor S1 or S2 or both are disconnected, the -input voltage of the comparators (IC3, IC4) is the resistance (R8 or R9). ), The power supply voltage is applied directly and becomes higher than the + input set voltage of IC3 and IC4.The output of IC3 and IC4 goes from high (H) to low (L). You will know.

At this time, the diodes D3 and D4 are for preventing the reverse voltage from being prevented from being input to the negative side of the high voltage IC3 and IC4 even if the resistance value of the thermistor changes according to the ambient temperature change.

As described above, in the present invention, even if the general consumer plugs the device into the mat connector, it is possible to simply determine whether there is an abnormality by the fault display device, and thus wastes unnecessary request for A / S even if the bulky mat is not broken. It is a device that can reduce the time and cost of both the manufacturer and the user (consumer).

Claims (4)

In the device for determining the disconnection of the heating wire and the temperature sensing thermistor of the electric mat, A comparator IC1 connected in series with the heating wire and comparing an internally set voltage value with a voltage value changed in the event of disconnection, a display unit L1 connected to an output of the comparator IC1 to display a disconnection display, and the temperature A comparator IC2 connected in series with a sensing thermistor to detect whether there is a short by comparing an internally set voltage value with a changed voltage value during a short, and a display part L2 connected to an output of the comparator IC2 and displaying a short display. Fault determination device of mat. The method of claim 1, The failure detection device of the mat is a comparator IC1 for detecting the disconnection of the heating wire and a comparator IC2 for detecting the disconnection and short of the temperature sensing thermistor are connected in series with the heating wire and the thermistor respectively to simultaneously detect the presence or absence of the disconnection of the heating wire and the temperature sensing thermistor. Failure determination device of the mat, characterized in that. delete delete