KR20100130820A - A electric heating controller and the safety device of the same - Google Patents

Abstract

PURPOSE: A temperature controller and a safety device thereof are provided to improve responsibility and reliability regarding the temperature control of a heating device by accurately detecting temperature when a local overheating is generated. CONSTITUTION: A first and a second heating terminals(H2) are connected to both ends of a heating line. A heater(SC) is connected to a first heat sensitivity terminal(S1) and a second heat sensitivity terminal(S2). A temperature-sensitive resin(N1) insulates between the heating line and the heater. A power part supplies a DC voltage after rectifying AC power. A SCR(Silicon Controlled Rectifier) is connected between the second heating terminal and a second power terminal(AC2) from the AC power.

Description

A electric heating controller and the safety device of the same

The present invention is a heating wire that is widely used in electric heating, heating plate, etc. heating device as a heating device, insulated with a thermosensitive resin whose impedance changes according to the temperature change between the electric heating element and the thermosensitive wire, by sensing the temperature change by the thermosensitive resin It relates to a thermal wire type temperature control device for controlling temperature and a safety device in case of local overheating and abnormality.

In general, the method of controlling the temperature of the heating apparatus is to sense and control the temperature of the heating apparatus generated by the current flowing through the heating wire by installing a separate temperature sensor, and to the thermal line using the impedance of the nylon thermistor. The thermal line method is used to detect and control the current change.

The heating wire of the thermal wire type is insulated with a nylon thermistor (NTC) whose impedance varies with temperature outside the heating wire as shown in FIG. 1, and after the thermal wire is wound around the outside of the nylon thermistor, the outer wire is coated with an external insulating material. do.

The temperature control method using a thermal line refers to a method in which heat is generated in a heating line when a current flows in the heating line, and temperature control is performed by sensing a current change due to a change in impedance that changes according to the heating temperature.

The thermal wire method uses a heating wire and uses a separate temperature sensor and a bimetal, which is a temperature protection device, so that the thermal wire itself can sense temperature and prevent temperature overheating. It is becoming.

In addition, since the thermal wire is disposed on the heating wire as a whole, it is known that the ability of preventing local overheating is more reliable than the general temperature sensor method.

For example, in case of electric cable, when the electric cable is folded or heavy object such as pillow is placed on the electric cable during the use, general temperature sensor method generally uses about 2 temperature sensors and 2 bimetals for two people. If the folded part or the pressed part is a point away from the temperature sensor or the bimetal, the accuracy of the temperature detection is reduced. Therefore, the part is overheated as compared to the unfolded part because the temperature is not sensed.

The installation of more temperature sensors can increase the reliability of overheating detection, but it is not practical in terms of working conditions and costs.

On the other hand, the thermal wire method has the advantage that even if any part is folded or pressed, the thermal wire is installed together with the heating wire, so that the overall temperature can be sensed so that it is possible to prevent overheating even if it is locally overheated.

However, in practice, even though the thermal line method is still adopted, local overheating is not completely detected 100%, and user complaints have been caused by various accidents due to fire and burns due to local overheating every year.

The reason is that in case of the thermal element product using nylon thermistor, the voltage applied to each part is different due to the voltage drop, so even if the same temperature rise occurs depending on the overheating part, the current flowing through the sensing part has a different value.

As a result, the temperature detection is different depending on the portion of the heating wire due to this cause, the user is burned or a fire occurs and the product life is shortened.

In addition, if local overheat occurs near the ground side, even though the temperature rises continuously, the sensing current flows to a dangerous temperature that does not generate a signal enough to cut off the power supply and reaches a dangerous temperature, causing the user to burn. Or cause a fire.

In the case of an electric yoke or a floor plate, it is common to install a heating wire in the same manner as in FIG. 2-1 or to install a heating wire in the same manner as in FIG. 2-2. Depending on the user's lying position, temperature control may or may not be performed properly and may result in overheating.

In addition, even if the user has fixed the dial at a temperature appropriate to the user, the temperature may be higher or lower depending on the lying position, so that the user may have to change the dial to increase or decrease.

In addition, in the case where a failure of some components in the temperature control device occurs, in particular, the SCR, which is a power device, may be caused by a failure, or the thermal wire may be shorted, thereby causing the above-mentioned accident.

Therefore, even in the above case, a minimum safety device is required.

The present invention is to solve the problem of not detecting the local overheat according to the local overheating place in the conventional heating device, the temperature sensing and control signal is generated only in the detection cycle in which the heating current does not flow so that no voltage drop occurs during temperature sensing In addition, the present invention aims to provide an electric heating device with enhanced safety devices in case of breakdown and sleep.

 Electronic parts have a warranty period of a certain period of time, which may cause failure due to durability or external causes. In particular, the electric cable is a product that is used by people in close contact with each other. Therefore, a minimum device is required to cut off the power even if the parts are abnormal or uncontrollable. It is possible to take the action of plucking, but during bedtime, the user is particularly vulnerable to defensive ability, and thus requires a separate bedtime function.

The present invention is to provide a function that can safely use the product even in normal use or bedtime by adding the safety function as described above.

As a technical means for achieving the above object, the temperature control device of the heat transfer mechanism of the present invention comprises: first and second heating terminals connected to both ends of the heating line (HC); A thermal line SC disposed to be parallel to the heating line HC and connected to both ends of the first thermal terminal S1 and the second thermal terminal S2;

A thermosensitive resin (N1) insulated between the heating line (HC) and the thermal line (SC) and whose impedance changes with temperature change; An operating power supply unit rectifying the AC power and supplying a DC voltage source (Vcc); The first heat generating terminal (H1) is connected to the first power terminal (AC1) of the AC power, the SCR connected between the second heat generating terminal (H2) and the second power terminal (AC2) of the AC power: the A temperature sensing unit configured to generate a control signal by detecting a change in the negative side current flowing in the opposite direction to the SCR through the thermosensitive resin (NTC) during a temperature reduction period in which a reverse voltage is applied to the SCR; A signal controller for receiving an signal from the temperature sensor and generating an operation control signal for operating the SCR, and delaying the operation control signal;

A sleep function for reducing the load power so that the heating temperature is not generated above a predetermined temperature by switching a circuit to connect the heating line and the thermal line in series to be used as a heating load; Characterized in that it comprises a.

The apparatus may further include a power controller configured to control the ON / OFF of the SCR by receiving the signal from the signal controller.

In addition, the overheat protection unit is connected to the first short-circuit diode D6 connected in series with the ground portion E connected to the second power terminal AC2 through the heat generating resistor R14, and further comprising the first sensing unit. A short detection node nd2 connected to the anode of the diode D5;

It is connected in series between any terminal of the AC power source and the connection terminal of the heating wire, and is provided in close proximity to the heat generating resistor R14 so that the AC power is supplied when the heat generating resistor R14 generates more than a set temperature. It consists of a thermal fuse (F2) to cut off.

In addition, an overcurrent fuse F1 is provided between the first power supply line AC1 and the first heat generating connection terminal H1, and an anode of the fourth control diode D8 is connected to the anode of the SCR. One end of the overcurrent fuse (F1) is connected to the cathode of the fourth control diode (D8), the current flows through the fourth control diode (D8) and the overcurrent fuse (F1) in case of failure of the SCR. It is characterized by.

In addition, the sleep function unit includes a switch for switching between the normal mode and the sleep mode,

In the normal mode, the heating line HC is connected to the AC power supply via the SCR by the switching switch, and the thermal line is connected to a temperature sensing unit to control the SCR by a sensing signal of the temperature sensing unit. The sleep mode includes a structure in which the thermal line SC is disconnected from the temperature sensing unit by the switching switch and connected in series with the heating line HC.

In addition, the temperature sensing unit is connected to the ground via E connected to the second power supply terminal AC2 through a first charging capacitor C3 to sense the output of the voltage according to the temperature change to the first input terminal of the first comparator. A first sensing unit diode D5 and a first node connected in series between a voltage node nd1, the sensing voltage node nd1, and the first thermal terminal S1, and connected in a reverse direction to a forward voltage of the SCR. Sensing unit resistor (R12);

In addition, the thermosensitive insulating resin (N1) may be a nylon thermistor.

In addition, when the temperature control device is short-circuited between the heating line HC and the thermal line SC, the ground unit E-the first short-circuit diode D6-the heating resistor R14 during the sensing period. -The short-circuit sensing node (nd2)-The first sensing unit diode (D5)-The first thermal terminal (S1)-The short-circuit point of the thermosensitive insulating resin (N1)-The first heating terminal (H1)-The first power supply terminal (AC1) And a safety device that generates the heat generating resistor R14 by causing a short circuit current to flow in the order of.

In addition, the SCR of the temperature control device forwards the current flow direction from the second heat generating connection terminal (H2) to the ground (E) connected to the second power terminal (AC2) during the 1/2 cycle of the AC power in the forward direction. And the current of the AC power source is connected to the first heating terminal H1-the heating line HC-the second heating terminal H2-SCR-the grounding part E during a heating cycle in which a forward voltage is formed in the SCR. The ground unit E-the first charging capacitor C3-the sensing voltage node nd1-the first sensing unit resistor R12 during the remaining sensing cycles in which the heating element flows to generate heat and a reverse voltage is formed in the SCR. )-First sensing unit diode (D5)-First thermal terminal (S1)-Thermosensitive insulating resin (N1)-First heating terminal (H1)-First power terminal (AC1) The voltage of the sensing voltage node charged in the first charging capacitor C3 is input to the first input terminal of the first comparator U1, and In the first comparator (U1) it is characterized in that for outputting a temperature control signal for controlling the ON-OFF of said SCR.

In addition, the temperature controller inputs the voltage of the DC voltage source Vcc to the second input terminal of the first comparator U1 through the variable resistor VR1, and adjusts the set temperature by the variable resistor VR1. It is characterized by being.

In addition, the signal control unit of the temperature control device is a first signal unit transistor (Q2) which is operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; First signal part resistor R6 connected between the collector of the first signal part transistor Q2 and the DC voltage source Vcc: between the delay node nd3 and the collector of the first signal part transistor Q2. A second signal part resistor R10 connected;

And a second charging capacitor C4 connected in parallel between the delay node nd3 and the ground part E. When the temperature control signal is a signal for requesting ON of the SCR, the first signal part is included. According to an operation signal of the transistor Q2, a current flowing through the first signal portion resistor R6 and the second signal portion resistor R10 by the DC voltage source Vcc is charged to the second charging capacitor C4. The voltage of the first input terminal of the second comparator U2 is delayed and supplied as long as it is.

In addition, the signal control unit of the temperature control device is a first signal unit transistor (Q2) which is operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; First signal part resistor R6 connected between the collector of the first signal part transistor Q2 and the DC voltage source Vcc: between the delay node nd3 and the collector of the first signal part transistor Q2. A second signal part resistor R10 connected; And a first signal diode D4 connected in parallel with the second signal resistor R10. When the temperature control signal is a signal for requesting the SCR to be turned off, the first signal transistor includes: Q2) is turned on so that the voltage charged in the second charging capacitor C4 is discharged through the first signal unit diode D4, thereby controlling the SCR in the second comparator U2. Characterized in that the signal is output.

In addition, the temperature control device includes a first signal unit transistor (Q2) which is operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; And a second control unit diode D3 connected between the sense voltage node nd1 and a reference voltage input terminal of the second comparator, and between the second thermal terminal S2 and the ground unit E. The first control unit resistor R17 is connected, and the second sensing unit resistor R3 is connected between the DC voltage source Vcc and the sensing voltage node nd1, whereby disconnection of the heat sensitive line SC is caused. If so, the voltage of the reference voltage input terminal of the second comparator is higher than the set reference voltage, the second comparator outputs an OFF control signal to the SCR, characterized in that the temperature control device and safety device.

In addition, the sleep function unit of the temperature control device includes a switching switch for switching between the normal mode and the sleep mode, and in the normal mode, the second heating terminal (H2) by the switching connection of the switching switch (SW2) is the SCR Is connected to the anode terminal of the first thermal terminal (S1) is connected to the temperature sensing unit, and in the sleep mode, the second heating terminal (H2) by the switching connection of the switching switch (SW2) is the second thermal terminal ( S2), and the first thermal terminal S1 is connected to the anode terminal of the SCR, and further, a fifth control unit diode D7 is connected between the first thermal terminal S1 and the anode terminal of the SCR. The structure is connected in the same forward direction.

Unlike the conventional control method, the temperature control method of the present invention is a temperature control device that can increase the responsiveness and reliability of the temperature control of the heating apparatus because the temperature can be accurately sensed even if local overheating occurs anywhere.

In addition, a safety device that shuts off the power supply in case of malfunction or abnormality of the temperature controller is added to increase safety compared to the conventional control device. In particular, the sleep function is additionally added, so that the control circuit does not operate during sleep. Even if you do not have a safe effect.

Currently, the existing temperature control method is largely divided into two, one is a zero volt PWM (PULSE WIDE MODULATION) as shown in FIG. 3 and the other is a zero volt on off method as shown in FIG.

The zero volt PWM method is a method of maintaining the surface temperature at a set temperature by measuring the current and reducing the power pulse supplied to the heating wire so as to supply less power, as the impedance of the nylon thermistor decreases as the temperature increases. .

The zero-volt on-off system, when the temperature of the heating wire is lower than the set temperature, the half wave is introduced like the PWM method, but when the set temperature is reached, the power supply element (usually using SCR) is turned off to cut off the power supply. Is controlled.

Compared with the zero volt PWM method, the zero volt on / off method has been used in recent years because the circuit is simple, the response speed is fast, and the temperature control is relatively accurate.

In the circuit of FIG. 5, which is a zero volt on / off system, when a user connects a power source, current flows through the heating lines H1 and H2 and generates heat. The temperature is set by adjusting the reference voltage with VRa at the comparator reference voltage input side.

At this time, the current drawn from the thermal lines S1 and S2 is smoothed in Ca through H1 and H2-nylon thermistors N-S1 and S2-Da-Ra and input to the negative side of the comparator.

When the heating wire temperature does not reach the set temperature, the impedance of the nylon thermistor is high (nylon thermistor is NTC-negative temperature coefficient-characteristic with negative temperature coefficient). Since the amount of current drawn into S2 will be small, and the voltage is lower than the voltage set by the variable resistor VRa, the comparator output becomes high and the signal is applied to the power control element SCRa through the transistor Qa to turn on. Power supply is maintained.

When the temperature of the heating wire rises and the surface temperature of the main body reaches the set temperature, the impedance of the nylon thermistor becomes smaller than the first, so that the amount of current flowing in increases and the positive current flows through the diode (Da). Since both ends of the capacitor Ca are charged, the negative input voltage of the comparator Ua increases.

When the side input voltage is higher than the voltage set by the variable resistor VRa, the output of the comparator is inverted from high to low, and the power device SCRa is turned off to stop the power supply. By repeating this operation, the surface temperature of the main body maintains the temperature set by the variable resistor VRa.

However, when the local overheating occurs between the heating lines H1 to H2, the temperature control causes a problem different from the above state.

For example, when the temperature of the heating wire rises, the impedance of the nylon thermistor decreases, and the impedance at this time refers to the impedance of the entire heating wire.

In this state, if the heating wire is evenly heated, the integrated impedance decreases, so the amount of current flowing through the thermal wire increases.If local heating is overheated at a specific part of the heating wire, the impedance of that part is reduced more than other parts. As the amount of current increases, the voltage at both ends of the capacitor Ca increases through the diode Da, and the comparator Ua operates to stop the power supply so that the heater temperature can be stably controlled.

However, when such local overheating occurs, even if the same temperature overheating phenomenon occurs, the amount of current flowing into the sensing line varies depending on the portion of the temperature overheating, thereby causing a problem in reliability.

In other words, even if any part is overheated, the impedance is reduced as it is overheated, so the amount of current flowing into the thermal wire is increased and the control signal to stop the power supply should be output. On the other hand, since the amount of current flowing into the sensing line varies depending on the voltage of the overheated part, the temperature change cannot be accurately detected, and the temperature continues to rise.

In general, in the case of an electric cable, a heating wire of about 34M to 40M is installed on a two-person basis. When connected to a temperature control device as shown in FIGS. It is drawn in with a ruler and the other wire is connected for circuit grounding.

5 and 6, in order to sense the temperature, a current flowing in the order of the heating lines H1 and H2-nylon thermistor N-sensing lines S1 and S2 is input to the comparator Ua through the diode Da.

The voltage state of each part was measured by using AC2 as the ground reference, and the voltage value of each part is shown as shown in FIG. 6 by the voltage drop.

When the temperature of the heating wire increases, the impedance of the nylon thermistor decreases with time. When the voltage distribution of the heating wire when the current flows is divided, the heating wave is a resistor, so the waveform of the voltage appears as shown in FIG. 7.

That is, the a point of the heating wire becomes a half wave of + 220V based on the reference voltage AC2, and the b point decreases by the voltage drop between a and b. That is, point b is + 165V, point c is + 110V, point d is + 55V, and point e is 0V. When the heating wire temperature rises, the impedance of each part of the entire heating wire decreases equally for each part at the same temperature, but the amount of current is different because the voltage of each part is different as described above. Each part will be different.

As a result, the amount of current flowing into the thermal line becomes the sum of all of these currents and is smoothed through the diode to appear as a DC voltage.

In other words, the temperature of the set voltage is set by the sum of the total current flowing in the order of heating wire-nylon thermistor-sensing wire, and the maximum temperature is set. Therefore, if a part of the electric cable is folded or a heavy object is put on, a If the area around the point is locally overheated, the impedance of the part becomes smaller as it is overheated compared to the other parts, and the voltage at point a is higher than that of the other heating wires, so that the amount of current is large. Will flow.

At that point, the temperature of the other parts, b, c, d, and e, has not risen yet, and the impedance is higher than that of a. Is reduced by temperature compared to other parts, and since the voltage at part a is the highest, the current flowing into the sensing line flows more current than other parts.

When the current flowing through the entire area is summed up, a lot of current flows through the diode Da, and the voltage across the capacitor Ca is rapidly increased, and the set voltage is quickly reached, and the output of the comparator is inverted to supply power by the SCR. Will be interrupted.

In other words, even if the point other than the point a has not yet reached the set temperature, the point a becomes local overheating and determines that the set temperature has been reached.

This is the case where point b overheats. When point a is overheated and the temperature is the same, even though the impedance is the same, the voltage is lower than point a, so the amount of current flowing in is smaller than that at point a. As a result, a small amount of current flows into the diode Da as compared with a point overheating.

Therefore, the voltage across the capacitor Ca takes more time to reach the set voltage by VRa than the overheat of point a. Therefore, the power supply is cut off after the temperature of the heating wire increases further compared to the overheat of point a. .

Next, when the point c looks at the local overheating time, the heating wire becomes overheated because the current decreases further and the power supply takes longer to stop as compared to when the points a and b are overheated.

In addition, when local overheating occurs near the points d and e, the voltage drops to 55 V or less due to the voltage drop, so that the current does not flow enough to reach the set voltage even when the temperature of the heating wire rises and the impedance decreases.

As a result, when the local overheating occurs at points d and e, the temperature control device does not operate even when the temperature is overheated, and thus the temperature of the heating wire continues to rise to become a dangerous state.

Based on the above experimental example, in one embodiment of the present invention in the temperature sensing method by the thermal line, in order to reduce the local error due to the voltage drop during the detection by controlling the cycle so that no current flows in the heating line Method was adopted.

Hereinafter, the configuration of the present invention will be described with reference to FIG.

One embodiment of the present invention comprises an operating power supply unit-temperature sensing unit-overheat protection unit-signal control unit-power control unit and sleep function.

The operation power supply unit is composed of a rectifying unit converting an AC current into a direct current, and is a circuit unit supplying a DC voltage source (Vcc) by rectifying the AC power for the operation of the control circuit.

The temperature sensing unit is a circuit unit for generating a control signal by detecting a current change flowing in the opposite direction to the SCR through a thermosensitive resin (NTC) during a temperature reduction period in which a reverse voltage is applied to the SCR.

The signal control unit is a circuit unit which generates an operation control signal for operating the switching control element in response to the signal of the temperature control unit 12 and delays the operation control signal.

The power supply control section is a circuit section that receives the signal from the signal control section 13 and controls the ON / OFF of the switching control element.

The overheat prevention unit is a circuit unit which blocks the temperature fuse through a resistance that generates heat when a predetermined current or more flows to the temperature sensing unit due to a short circuit between the thermal wire and the heating wire.

The sleep function is a circuit part that reduces the overall load power by allowing the heating wire to be used as a heating load by the switching switch so that the heating wire does not become a high temperature even when the temperature control is impossible due to a poor temperature controller during use.

The thermal line SC is disposed in parallel with the heating line HC as shown in FIG. 1, and is connected to both ends of the first thermal terminal S1 and the second thermal terminal S2. The heating line HC and the thermal line SC are insulated with a nylon thermistor N1 which is a thermosensitive insulating resin.

As shown in FIG. 8, the heating line HC has a first heat generating terminal H1 connected to the first power terminal AC1 of the AC power source and a second power supply terminal AC2 of the AC power source through the SCR. It is connected to (H2). The sensing voltage node nd1 for outputting a voltage according to a temperature change to the first input terminal of the first comparator is connected through a first charging capacitor C3 from a ground portion E connected to the second power terminal AC2. The first sensing unit diode D5 and the first sensing unit resistor R12 are connected between the sensing voltage node nd1 and the first sensing terminal S1 in a reverse direction to the forward voltage of the SCR connected in series. .

The SCR connects the current flow direction from the second heat generating connection terminal H2 to the ground portion E in the forward direction during the 1/2 cycle of the AC power, and the current of the AC power is generated during the heating cycle in which the forward voltage is formed in the SCR. The heat generating element flows through the first heat generating terminal H1-heating line HC-second heat generating terminal H2-SCR-grounding portion E.

In the remaining sensing period in which the reverse voltage is formed in the SCR, the first sensing unit resistor (R12)-the first sensing unit diode (D5)-the first sensing terminal (S1)-from the point c divided by R3 and R18. The sensing current flowing in the order of the thermosensitive insulating resin N1-the first heat generating terminal H1-the first power supply terminal AC1 flows, so that the voltage charged in the first charging capacitor C3 by the sensing current flows. The first comparator is input to the first input terminal.

The voltage of the DC voltage source Vcc supplied from the operating power supply unit is input to the second input terminal of the first comparator U1 through the variable resistor VR1, and the reference of the first comparator U1 is controlled by the variable resistor VR1. By adjusting the voltage, the set temperature of the heater can be adjusted.

First, when the power supply SW1 is turned on, the operation power supply unit converts AC into DC to provide a DC voltage source Vcc in the circuit. In one embodiment, the DC voltage source Vcc is set to 12V.

The user sets the temperature by turning VR1. At this time, the set voltage is input to the + side of the first comparator U1 of the temperature sensing unit. The higher the temperature, the lower the voltage and the lower temperature, the higher the voltage. (In one embodiment, the temperature is set at 65 degrees Celsius → 2V, 35 degrees Celsius → 6V.) This is because the general temperature control method controls the temperature by the amount of current flowing in the order of heating line-nylon thermistor-sensing line. On the contrary, in the present invention, temperature is controlled by the amount of current flowing in the order of the sensing line-nylon thermistor-heating line.

That is, as the temperature of the heating wire rises from the voltage divided by R3 and R18, the voltage at both ends of C3 is lowered.

For example, when R3 = 2㏀, R18 = 10㏀, and Vcc = 12V, the voltage across C3, that is, the voltage across C3, that is, the voltage divided by the DC voltage source in the state that the thermal wire is cut off, do. After that, in the initial stage, when the voltage of the -input side of the first comparator U1 is set to a high temperature (2V) and a voltage is applied to the heating wire, the nylon thermistor has a fundamental high impedance at low temperature, so that the sensing voltage node nd1 is present. From this, some current flows to AC1 side, and the DC voltage at point c is lowered from 10V to 7V.

Therefore, in the initial stage, since the voltage 7V on the −input side of the first comparator U1 is higher than the set voltage 2V of +, the output of the first comparator U1 is low and the first signal sub-transistor Q2 is OFF, the voltage of the DC voltage source is applied to the + input side of the second comparator U2 through the delay circuit.

As shown in FIG. 8, the delay circuit includes a second signal resistor R10 connected between the delay node nd3, which is the first input terminal of the second comparator U2, and the collector of the first signal receiver transistor Q2. ) Is connected, and the first signal portion resistor R6 is connected between the collector of the first signal portion transistor Q2 and the DC voltage source Vcc.

The first signal part diode D4 is connected in parallel with the second signal part resistor R10 between the delay node nd3 and the collector terminal of the first signal part transistor Q2, and the delay node nd3 and the ground part are connected in parallel. The second charging capacitor C4 and the zener diode ZD2 are connected in parallel between (E).

For example, if the DC voltage source is set at 12V and the zener diode ZD2 is set at 8V, and the resistances of R7 and R15 are the same, 6V is input to the negative input of the second comparator U2.

Since the voltage at both ends of the signal controller C4 is currently in the off state of the first signal transistor Q2, the voltages at both ends of the C4 gradually increase while being charged at both ends of the C4 in the order of + 12V-R6-R10-C4.

In one embodiment, the resistance value of R10 is set to take about 30 seconds for the voltage at both ends to reach 6V.

After about 30 seconds have elapsed, if the voltage across C4 exceeds 6V, the -computer of the second comparator U2 is set to 6V, so the output of the second comparator U2 remains low for 30 seconds. Inverted to high, the power supply control unit TR (Q1) outputs an on signal.

According to the TR (Q1) signal, the power device SCR is turned on and a half-wave current flows in the order of AC1-F1-H1-H2-SW2-SCR-AC2 in the heating line.

As a result, power is supplied to the heating wire 30 seconds after the power is turned on.

As the current flows through the heating wire and the temperature rises, the impedance of the nylon thermistor gradually decreases.

The voltage higher than point (b) cannot flow into the temperature control unit due to the direction of the first sensing unit diode D5 of the temperature sensing unit.However, as the temperature of the heating wire increases, the voltage of point (a) due to the impedance decrease of the nylon thermistor. Is lowered to minus, and gradually lower than the potential at point (c), and the current gradually increases.

For example, in the reverse direction, when the reference point (c) is used, the voltages of the heating lines H1 and H2 become a potential of -220 V, so that the current is the point (c) -R12-D5-SW2-S1, S2-nylon thermistor N1. -H1, H2-current fuse F1-AC1, and as the impedance of nylon thermistor decreases, the potential at point (c) becomes lower.

If the heating wire temperature continues to rise, the potential at point (c) becomes lower than the voltage set by VR1 (set to 2V in one embodiment), and at that moment, the output of comparator U1 of the temperature control part is inverted from low to high to high. A signal is output (that is, a signal for requesting OFF of the SCR), and the first signal section transistor Q2 of the signal control section is turned on.

At this time, the voltage of 8V, which is charged at both ends of the second charging capacitor C4 of the signal control unit and formed by the zener diode ZD2, is applied to the first signal unit diode D4 at the moment when the first signal unit transistor Q2 is turned on. Is discharged, and the voltage across the second charging capacitor C4 becomes 0V, and the + input of the second comparator U2 is lower than 6V, which is the reference voltage input to the − input side of the second comparator U2. .

Therefore, since the output of the second comparator U2 is inverted and becomes low from high, and the TR (Q1) of the power supply controller is turned off and the SCR is turned off, power supply of the heating wire is stopped.

That is, when the output of the comparator U1 is high, the first signal part transistor Q2 is turned on so that the collector terminal becomes conductive with the ground part E and is charged in the second charging capacitor C4. By discharging through the first signal unit diode D4, the OFF signal of the SCR is output from the second comparator U2.

In addition, when the SCR is turned on and the half-wave current flows between the heating lines H1 and H2, as shown in Fig. 6, the a, b, c, d, and e voltages are applied to each part of the heating line, but when the SCR is turned off, the heating current is generated in the heating line. Since the flow does not flow, the impedance of the thermosensitive resin increases again.

Therefore, in FIG. 8, since a large amount of current flows in the order of (c) to (b) to (a), no current flows in the heating line, so that the voltage at the input side of the first comparator U1 of the temperature sensing unit increases. As a result, the output of the first comparator U1 is immediately inverted, so that the first signal part transistor Q2 is turned off again.

However, since R10 is high resistance and the capacitor C4 has a large capacity, the current charged at both ends of C4 is gradually charged in the order of + 12V-R6-R10-C4, and the voltage at both ends of C4 increases. Therefore, the output of the second comparator U2 is kept low for 30 seconds when the voltage rises, and the SCR is turned off. After 30 seconds, the second comparator U2 of the signal controller is inverted again and the high to high TR (Q1) of the power supply control unit is turned on, and the SCR is turned on again, and power is supplied to the heating wire.

If this condition is repeated, the nylon thermistor N1 has a large impedance when the temperature of the heating wire is low, so the amount of current flowing in the reverse direction is small at first, and thus the time at which the potential at point (c) falls to the voltage set by VR1 is reduced. It takes a lot, but if the temperature of the heating wire rises and continues to hold the heat, the impedance of the nylon thermistor gradually decreases, so the amount of current flowing out gradually increases, and the time for which the SCR is turned on decreases.

As a result, since the delay time for charging the both ends of the second charging capacitor C4 of the signal controller is determined, when the temperature rises to a certain temperature or more, the ON time becomes shorter as the temperature of the heating wire rises, so that the surface of the heating device becomes larger. The temperature is kept constant.

The following describes the case of local overheating.

In case of local overheating where point A is hotter than other parts of the heating wire of FIG. 8, the impedance of point A is reduced compared to B, C, D, and E, and the potential of point A is 220V as described above. It is a condition that can flow a lot.

However, when the AC current flows from AC1 to AC2 between the heating line and the sensing line, it does not flow in the direction of the first sensing unit diode D5 of the temperature sensing unit, and in the direction of AC2 to AC1, that is, the time when no current flows in the heating line. Ground current (E)-first charging capacitor (C3)-sensing voltage node (nd1)-first sensing resistor (R12)-first sensing diode (D5) -SW2-First Thermal Terminal (S1)-Thermosensitive Insulation Resin (N1)-A Point-First Heating Terminal (H1)-Fuse F1-First Power Supply Terminal (AC1), current flows in order When the temperature is higher than the temperature, the potential at the point (c) of the sensing voltage node nd1 is lowered, so that the SCR is turned off to prevent overheating.

Next, we look at this local overheating of point B. Based on the circuit ground of AC2, the potential at point B corresponds to 175V. Therefore, in a general circuit, a smaller current must flow at the same impedance as point A, but the current when flowing from AC1 to AC2 is As described above, it is blocked by the direction of the first sensing unit diode D5 of the temperature sensing unit and has no effect.

When current flows from AC2 to AC1, the current supplied to the heating wire by the power element SCR is cut off, but as described above, in the order of point c-R12-D5-SW2-S1-B point-H1-F1-AC1. Current flows.

Therefore, since no current flows to the heating wire during the AC cycle flowing from AC2 to AC1, the potential of the local superheat points A, B, C, D, and E of the heating wire is based on the reference voltage AC2 while the current flows from AC2 to AC1. As you can see, they all have a potential of -220V.

Accordingly, even if a part is locally overheated, the current flowing based on the point (c) of the sensing voltage node nd1 of the temperature control unit increases only as the impedance decreases, and the potential of the sensing voltage node nd1 is lowered. (Since the amount of current flowing in the reverse direction increases). When the potential is lowered below the set voltage, that is, when the temperature is higher than the set temperature, the first comparator U1 outputs a temperature control signal to the signal controller to turn off the SCR to prevent overheating.

In the embodiment of the present invention, when the current flows in the forward direction of the SCR, the current is supplied to the heating wire to generate heat, but the forward current as described above is performed in the temperature sensing unit by the first sensing unit diode D5 connected in the reverse direction. Does not detect.

In other words, by sensing the temperature in the temperature sensing unit only while the SCR is turned in the reverse direction, even if any part of the heating wire is locally overheated, the proportional current flows as the impedance of the nylon thermistor decreases, so that the existing method flows. The temperature is controlled by the amount of incoming current, but the present invention is temperature controlled by the amount of current flowing out, so that the present invention has a higher reliability for local overheating than the conventional method. That is, in one embodiment of the present invention, even if any part is locally overheated, the overheated temperature is accurately sensed, thereby making it safer.

Next will be described with respect to the safety circuit adopted in one embodiment of the present invention.

If the sensing line is disconnected due to overheating or breakage during use. In this case, the current flowing into the sensing line decreases, so that even if overheated above the set temperature, the set voltage corresponding to the set temperature cannot be reached and the state where the -input voltage of the comparator U1 is higher than the + input voltage is maintained. As a result, the SCR is kept turned on so that the heating wire temperature continues to rise. That is, temperature control is not performed properly.

In order to prepare for the above case, as shown in FIG. 8, the second controller diode D3 is connected between the sensing voltage node nd1 and the reference voltage input terminal of the second comparator U2. A first control resistor R17 is connected in series between the second thermal connection terminal S2 and the ground portion E, and a second sensing unit is connected between the DC voltage source Vcc and the sensing voltage node nd1. The circuit to which the resistor R3 was connected was adopted.

In one embodiment, the first control unit resistor R17 is a high resistance value that does not affect the current flowing through the heating line.

In the normal operation state, when the potential of the point (c) is set to 10 V, the circuit is configured in the order of the point (c) -R12-D5-SW2-S1-S2-R17-ground. Since the basic impedance at room temperature of nylon thermistor exists at, the potential at point (c) is less than 10V when it is connected to heating wire. (In this embodiment, the value of R17 is set to about 7V or less.)

If the sensing line is disconnected as above, if the sensing line is disconnected, it is disconnected from the ground by R17, so that the potential at point (c) rises and the voltage of 10V is transmitted through the second control unit diode D3. It is input to the negative input side of the second comparator U2. The + input of the second comparator U2 is set to 6V as described above, and the-input side is set not to exceed 8V by the zener diode ZD2, so when the sensing line is disconnected due to any cause, The input voltage of the comparator U2 is inputted with a 10V voltage by the second control unit diode D3.

Therefore, while the output of the second comparator U2 goes from high to low, the output of the second comparator U2 is maintained to stop the power supply by turning off the SCR.

In addition, if the circuit is continuously heated without a normal operation due to a defective or damaged electronic component, that is, if the temperature is not controlled, the temperature of the heating wire may continue to rise. If the heating wire continues to overheat due to the abnormality of the circuit and rises to 120 degrees or more, the nylon thermistor at any part of the overheated portion melts, causing the heating wire and the sensing wire to become short.

In case of the above-mentioned case, in the exemplary embodiment of FIG. 8, the first short-circuit diode D6 having the short-circuit detection node nd2 connected to the anode of the first sensing diode D5 connected in series with the ground portion E is provided. And overheat protection part connected through heat generating resistor (R14). The temperature fuse F2 is connected in series between any one terminal of the AC power supply and the connection terminal of the heating wire, and is installed in close proximity to the heating resistor R14 to supply the AC power when the heating resistor R14 generates more than the set temperature. Will block.

If the short circuit between the heating line HC and the thermal line (SC) as described above, during the sensing period, the ground unit (E)-the first short circuit diode (D6)-heating resistance (R14)-short-circuit detection node (nd2)- The first sensing unit diode (D5)-the first thermal connection terminal (S1)-the short-circuit point of the thermosensitive insulating resin (N1), the first heat generating terminal (H1)-in the direction to turn the first power supply terminal (AC1) Current will flow. That is, when a large short-circuit current flows in the heat generating resistor R14, the heat generating resistor R14 generates heat, and the temperature fuse F2 closely spaced with the heat generating resistor R14 is disconnected, thereby stopping power supply. Prevents accidents due to short circuits.

In addition, when the SCR, which is a power device, is in a conductive state, an input voltage propagation flows instead of a half wave and is directly connected, resulting in an overheating phenomenon in which power consumption doubles. In this case, in an embodiment of FIG. 8, an overcurrent fuse F1 is installed between the first power supply terminal AC1 and the first heat generating terminal H1, and the fourth control diode D8 is provided at the anode of the SCR. ), And a circuit is connected to one end of the overcurrent fuse F1 to the cathode of the fourth control diode D8.

In other words, if the SCR is turned on due to a fault, the operating current flows as usual during the heating cycle, but during the sensing cycle, the overcurrent flows in the order of AC2-SCR (conduction) -D8-F1-AC1. Disconnect

In general, it is necessary to use a special care at bedtime rather than normal use when using the electric yoke will require a separate function.

Unlike the use of an electric yoke in awake state at bedtime, a fire or burn may occur due to a lack of sense or defensive ability during bedtime when the temperature controller is abnormal. Therefore, even in the worst case, it is necessary to prevent the temperature of the heating wire from rising.

In other words, by separately installing the bedtime function, a device is required to prevent the heating wire from becoming a high temperature even if the temperature control is not possible due to a poor temperature controller during use.

As a result of repeated experiments of the temperature rise of the heating apparatus according to the load power, when one-fourth of the rated power is supplied, the heating wire temperature is offset by the temperature that is offset to the outside even after several tens of hours. Since the rising temperature of becomes relatively weak, the surface temperature does not rise above 40 degrees.

In the case of electric power, it is usually manufactured with a power of about 200W on a two-person basis. When the power device uses half-wave SCR, the resistance of the heating wire (approximately 220V) uses about 120Ω, and The line will use 360 Hz.

Therefore, when the bed line is directly connected to the heating line and the sensing line to be used as the heating load power, the load power is 1/4 of the rated power.

In the exemplary embodiment of FIG. 8, the heating line HC is connected to an AC power source through an SCR, and the thermal line is connected to a temperature sensing unit in the normal mode using the switching switch SW2. The SCR is controlled by a sensing signal sensed by a temperature sensing unit operated according to a current change of the heat sensing line. In sleep mode, the connection of the heat sensing line SC to the temperature sensing unit is blocked by a switching switch SW2. It is connected in series with the said heating line HC. (Fig. 8 shows a state where the switching switch SW2 is connected in the normal mode.)

That is, as shown in Fig. 8, in the normal mode, the second heating terminal H2 is connected to the anode terminal of the SCR by switching connection of the switching switch SW2, and the first thermal terminal S1 is connected to the temperature sensing unit. And the second heat generating terminal H2 is connected to the second thermal terminal S2 by the switching connection of the switching switch SW2 in the sleep mode, and the first thermal terminal S1 is connected to the first heat terminal S1. It is connected to the fifth fisherman diode D7 and is connected to the anode terminal of the SCR via the fifth control unit diode D7.

In the normal mode, the heating wire consumes about 200W and the surface temperature of about 30 to 60 degrees is generated, and the temperature control is performed through the sensing line. The current flows in the order of -F1-H1-H2-SW2-S2-S1-SW2-D7-SCR-AC2.

At this time, the heating wire and the sensing wire are connected in series, so the combined resistance is 480 ohms, and the power consumption is about 50W, which is 1/4 of the rated power.

Therefore, the surface temperature of the electric yaw does not increase more than 40 degrees even if it continues to use without the need of temperature control separately.

If the power device is short-circuited during sleep, half-wave control is performed by connecting the fifth control unit diode D7 in the same forward direction as the SCR between the first thermal terminal S1 and the anode terminal of the SCR. Power consumption is not changed.

Such a device prevents overheating without the need for a separate temperature controller once the user uses the sleep function.

In addition, a resistor R9 is connected to both ends of the SW2, which is disconnected from the sensing line by the SW2 during the sleep function, and the SCR is turned off during the sleep function by the voltage being increased to 10 V through the D3 as described above. This is to prevent errors.

In the present invention, a logic circuit is used for explanation, but it may be replaced by a CMOS chip or a microcomputer.

1 is a view showing a heating wire of a thermal wire method using a nylon thermistor.

2-1 and 2-2 illustrate a heating line arrangement structure of an electric field plate currently used.

3 is a voltage waveform illustrating a zero volt PWM method.

4 is a voltage waveform illustrating a zero volt ON-OFF scheme.

5 is a schematic circuit diagram for explaining a concept of a temperature control device using a zero-volt ON-OFF method.

FIG. 6 is a schematic diagram for describing a voltage of each part of FIG. 5. FIG.

FIG. 7 is a voltage waveform of each part for describing the voltage of each part of FIG. 6.

8 is a voltage waveform of each part for explaining the temperature control device according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

H1, H2 ... 1st, heat generating terminal S1, S2 ... 1st, 2nd thermal terminal

AC1, AC2 ... 1st, 2nd power terminal SW1 ... Power switch

SW2 ... Sleep mode switching position D1 to D8 ... Diode

N1 ... Negative Temperature Nylon Thermistor SCR, ... Silicon controlled rectifier

VR1 ... Variable resistor U1,2 ... Comparators1, 2

C1 to C4 ... capacitance R1 to R18 ... resistance

Vcc ... DC voltage source Q1, Q2 ... transistor

F1 ... Overcurrent Fuse F2 ... Temperature Fuse

nd1 to nd2 ... connection node

Claims (17)

First and second heating terminals connected to both ends of the heating line HC; A thermal line SC disposed to be parallel to the heating line HC and connected to both ends of the first thermal terminal S1 and the second thermal terminal S2; A thermosensitive resin (N1) insulated between the heating line (HC) and the thermal line (SC) and whose impedance changes with temperature change; An operating power supply unit rectifying the AC power and supplying a DC voltage source (Vcc); An AC power source connected to a first power terminal AC1 to supply power to the first heat generating terminal H1; SCR connected between the second heat generating terminal (H2) and the second power terminal (AC2) of the AC power source: A temperature sensing unit configured to generate a control signal by detecting a change in the negative current flowing in the opposite direction to the SCR through the thermosensitive resin (NTC) during a temperature reduction period in which a reverse voltage is applied to the SCR; A signal controller for receiving an signal from the temperature sensor and generating an operation control signal for operating the SCR, and delaying the operation control signal; A sleep function for reducing the load power so that the heating temperature is not generated above a predetermined temperature by switching a circuit to connect the heating line and the thermal line in series to be used as a heating load; Temperature control device and a safety device of the heating apparatus comprising a First and second heating terminals connected to both ends of the heating line HC; A thermal line SC disposed to be parallel to the heating line HC and connected to both ends of the first thermal terminal S1 and the second thermal terminal S2; A thermosensitive resin (N1) insulated between the heating line (HC) and the thermal line (SC) and whose impedance changes with temperature change; An operating power supply unit rectifying the AC power and supplying a DC voltage source (Vcc); An AC power source connected to a first power terminal AC1 to supply power to the first heat generating terminal H1; SCR connected between the second heat generating terminal (H2) and the second power terminal (AC2) of the AC power source: A sensing voltage node nd1 connected to the second power supply terminal AC2 through a first charging capacitor C3 and outputting a voltage according to a temperature change to a first input terminal of the first comparator; The first sensing unit diode D5 and the first sensing unit resistor R12 connected in series between the sensing voltage node nd1 and the first thermal connection terminal S1 and connected in a reverse direction to the forward voltage of the SCR. Including; The SCR connects a current flowing in a forward direction from the second heat generating terminal H2 to the ground portion E connected to the second power terminal AC2 during a 1/2 cycle of the AC power, and forwards the SCR. In the heating cycle in which the voltage is formed, the current of the AC power flows through the first heating terminal H1-heating line HC-second heating terminal H2-SCR-grounding part E to generate the heating element. In the remaining sensing period in which the reverse voltage is formed in the SCR, the ground unit E-the first charging capacitor C3-the sensing voltage node nd1-the first sensing unit resistor R12-the first sensing unit diode (D5)-first thermal terminal (S1)-thermosensitive insulating resin (N1)-the first heating terminal (H1)-the first charging capacitor (C3) by the sensing current to cycle in the order of the first power terminal (AC1) The voltage of the sensing voltage node charged in the () is input to the first input terminal of the first comparator (U1), the first comparator (U1) of the SCR Temperature control device and a safety device thereof, comprising a temperature sensing unit for outputting a temperature control signal for controlling the ON-OFF The method of claim 2 And a signal control unit receiving the temperature control signal of the temperature sensing unit to generate an operation control signal for operating the SCR by receiving the signal of the signal control unit, and delaying the operation control signal. The safety device. The method according to claim 1 or 3 And a power control unit for controlling the ON / OFF of the SCR in response to the signal of the signal control unit. The method according to any one of claims 1 to 3 The thermosensitive insulating resin (N1) is a temperature control device and a safety device of a heating device, characterized in that the nylon thermistor. The method according to claim 1 or 2, The first short-circuit diode D6 connected in series to the ground portion E connected to the second power terminal AC2 and the heating resistor R14 are connected to each other, and the anode of the first sensing unit diode D5 is also connected. A short circuit detection node nd2 connected with the short circuit detection node nd2; When the terminal is connected in series between any one terminal of the AC power source and any one terminal of the heating wire, and is provided in close proximity to the heat generating resistor R14, the heat generating resistor R14 generates heat above a set temperature. Temperature control device and a safety device for a heating apparatus comprising an overheat prevention unit comprising a; temperature fuse (F2) for blocking the supply. The method according to claim 1 or 2 An overcurrent fuse F1 is installed between the first power supply terminal AC1 and the first heat generating terminal H1, and an anode of the fourth control diode D8 is connected to the anode of the SCR, and the fourth control is performed. One end of the overcurrent fuse (F1) is connected to the cathode of the diode (D8), the current flows through the fourth control diode (D8) and the overcurrent fuse (F1) when the SCR failure. Temperature control device and safety device for electric heating equipment. The method of claim 1, The sleep function unit includes a switch for switching between the normal mode and the sleep mode, In the normal mode, the heating line HC is connected to the AC power supply through the SCR by the switching switch, and the thermal line is connected to a temperature sensing unit to control the SCR by the detection signal of the temperature sensing unit. In the sleep mode, the heat switch SC is disconnected from the temperature sensing unit by the switching switch, and is connected in series with the heating line HC. Device. The method according to claim 1 or 2, The temperature sensing unit is connected through a first charging capacitor C3 from the ground unit E connected to the second power terminal AC2, and a sensing voltage outputting a voltage according to a temperature change to the first input terminal of the first comparator. Node nd1; The first sensing unit diode D5 and the first sensing unit resistor R12 connected in series between the sensing voltage node nd1 and the first thermal connection terminal S1 and connected in a reverse direction to the forward voltage of the SCR. Temperature control device and safety device for a heating apparatus comprising a; 10. The method of claim 9, The voltage of the DC voltage source (Vcc) is input to the second input terminal of the first comparator (U1) through a variable resistor (VR1), it is possible to adjust the set temperature by the variable resistor (VR1) Hot air balloon temperature control device and its safety device The method according to any one of claims 1 to 3, When the short circuit is between the heating line HC and the thermal line SC, the ground part E-the first short circuit diode D6-the heating resistance R14-the short circuit sensing node nd2 during the sensing period. )-First sensing unit diode (D5)-First thermal connection terminal (S1)-Short-circuit point of thermosensitive insulating resin (N1)-First heating terminal (H1)-First power supply terminal (AC1) A temperature control device and a safety device for a heat transfer mechanism, characterized in that the short-circuit current flows, so that the heat generating resistor (R14) generates heat. The method of claim 1, The temperature sensing unit is a sensing voltage node connected to the second power terminal (AC2) through a first charging capacitor (C3) from the ground (E) connected to output a voltage according to the temperature change to the first input terminal of the first comparator (nd1); The first sensing unit diode D5 and the first sensing unit resistor R12 connected in series between the sensing voltage node nd1 and the first thermal connection terminal S1 and connected in a reverse direction to the forward voltage of the SCR. ); The SCR connects a current flowing in a forward direction from the second heat generating connection terminal H2 to the ground portion E connected to the second power terminal AC2 during a 1/2 cycle of the AC power, and to the SCR. In the heating cycle in which the forward voltage is formed, the current of the AC power flows through the first heating terminal H1-heating line HC-second heating terminal H2-SCR-ground portion E to generate heat. In the remaining sensing period in which the reverse voltage is formed in the SCR, the ground unit E-the first charging capacitor C3-the sensing voltage node nd1-the first sensing unit resistor R12-the first sensing unit The first charging capacitor (D1)-the first thermosensitive terminal (S1)-the thermosensitive insulating resin (N1)-the first heating terminal (H1)-the first power supply terminal (AC1) by the sensing current to rotate in order The voltage of the sensing voltage node charged in C3) is input to the first input terminal of the first comparator U1, and the first comparator U1 A temperature control device and a safety device for a heating apparatus, characterized by outputting a temperature control signal for controlling the ON-OFF of the SCR. The method according to claim 3 or 12. The signal control unit includes a first signal unit transistor (Q2) operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; A first signal part resistor R6 connected between the collector of the first signal part transistor Q2 and a DC voltage source Vcc: A second signal part resistor (R10) connected between the delay node (nd3) and the collector of the first signal part transistor (Q2); And a second charging capacitor C4 connected in parallel between the delay node nd3 and the ground part E. When the temperature control signal is a signal for requesting ON of the SCR, the first signal part is included. According to an operation signal of the transistor Q2, a current flowing through the first signal portion resistor R6 and the second signal portion resistor R10 by the DC voltage source Vcc is charged to the second charging capacitor C4. The temperature control device and the safety device of the heat transfer mechanism, characterized in that for supplying by delaying the voltage of the first input terminal of the second comparator (U2) by the time. The method according to claim 3 or 12. The signal control unit includes a first signal unit transistor (Q2) operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; A first signal part resistor R6 connected between the collector of the first signal part transistor Q2 and a DC voltage source Vcc: A second signal part resistor (R10) connected between the delay node (nd3) and the collector of the first signal part transistor (Q2); And a first signal diode D4 connected in parallel with the second signal resistor R10. When the temperature control signal is a signal for requesting the SCR to be turned off, the first signal transistor includes: Q2) is turned on so that the voltage charged in the second charging capacitor C4 is discharged through the first signal unit diode D4, thereby controlling the SCR in the second comparator U2. Temperature control device and safety device, characterized in that the signal is output. The method according to claim 3 or 12, wherein A first signal part transistor (Q2) operated by the output of the first comparator; A delay node (nd3) connected to a first input terminal of a second comparator for outputting an ON / Off signal to the SCR; A second controller diode D3 connected between the sense voltage node nd1 and a reference voltage input terminal of the second comparator; A first control part resistor (R17) connected between the second thermal terminal (S2) and the ground portion (E); And a second sensing unit resistor R3 connected between the DC voltage source Vcc and the sensing voltage node nd1. When the thermal line SC is disconnected, a reference voltage of the second comparator is included. The input terminal voltage is higher than the set reference voltage, and outputs the OFF control signal from the second comparator to the SCR, the temperature control device and the safety device of the heat transfer mechanism. The method of claim 1, The sleep function unit includes a switch for switching between the normal mode and the sleep mode; In the normal mode, the second heating terminal H2 is connected to the anode terminal of the SCR by the switching connection of the switching switch SW2, and the first thermal terminal S1 is connected to the temperature sensing unit. In the sleep mode, the second heating terminal H2 is connected to the second thermal terminal S2 by a switching connection of the switching switch SW2, and the first thermal terminal S1 is an anode of the SCR. A temperature control device and a safety device of a heating apparatus, characterized in that the connection with the terminal. The method of claim 16, In the sleep mode, the temperature control device and the safety device of the heating apparatus, characterized in that the fifth control unit diode (D7) is connected in series in the same forward direction as the SCR between the first thermal terminal (S1) and the anode terminal of the SCR. .

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