KR100746303B1 - The electric heat mat controller - Google Patents

Abstract

A temperature controller of an electric heat mat is provided to improve convenience and safety by including an overheat-preventing device to prevent overheat and automatically stopping heating by the timer. A temperature controller of an electric heat mat includes a noise filter unit(2), an overcurrent/overheating preventing unit(3), a temperature setting unit(5), a half-wave constant voltage unit(4), a power voltage detecting unit(6), a comparing/triggering unit(9), a phase-advancing unit(8), a temperature detecting and heating unit(7), an outputting unit(10), a timer unit(12), and a serial constant voltage unit(11). The noise filter unit(2) absorbs and removes unnecessary noise included in AC power and high frequency noise generated in a circuit. The overcurrent/overheating preventing unit(3) protects the temperature controller from overcurrent and overheat. The temperature setting unit(5) sets a heating temperature. The half-wave constant voltage unit(4) supplies a half wave constant voltage to the temperature setting unit(5). The power voltage detecting unit(6) detects the advanced power voltage. The comparing/triggering unit(9) compares and controls the temperature with a phase controlling method, and maintains uniformly power consumption. The phase-advancing unit(8) prevents the overheat by advancing a control power than the AC power. The temperature detecting and heating unit(7) provides a temperature detecting voltage for comparing the temperature and a heat source. The outputting unit(10) controls a heat line of a heat-generating unit when a control signal is outputted from the comparing/triggering unit(9). The timer unit(12) finishes the operation of the temperature controller when the set time comes. The serial constant voltage unit(11) supplies a serial constant voltage to the timer unit(12). The heat line is connected between an output device cathode of the outputting unit(10) and a second AC power line.

Description

Temperature Controller of Heat Transfer Mat {THE ELECTRIC HEAT MAT CONTROLLER}

1 is a circuit block diagram of an embodiment of the present invention.

2 is a detailed circuit diagram of an embodiment of the present invention.

3 is a waveform diagram of an embodiment of the present invention.

4 is an exemplary diagram of the present invention.

<Explanation of symbols for main parts of the drawings>

(1)-AC power supply unit (2)-Noise filter unit

(3)-overcurrent and overheat cutoff (4)-half wave constant voltage

(5)-Temperature setting section (6)-Power supply voltage detecting section

(7)-Temperature Detection and Heating Part (8)-Truth

(9)-Comparison and Trigger Section (10)-Output Section

(11)-DC constant voltage section (12)-Timer section

(13)-Settings (15)-Timer

(16)-Indicator (AC1) (AC2)-First and second AC power lines

(C)-capacitor (D)-diode

(D11)-(D14)-Light Emitting Diode (Indicator) (F)-Fuse

(H)-heating wire (H1) (H2)-heating wire

(HC)-Return Part (K)-Insulation Core

(L1) (L2)-Line filter (N) (K2)-Insulation member

(PC)-Photocoupler (Q1) (Q2)-Transistor

(R)-resistance (S)-output element (SCR)

(S1) (S2)-Temperature Detection Line (SW)-Power Switch

(TS)-Time setting switch (U)-Microcomputer

(TF)-Temperature Fuse (ZD)-Zener Diode

The present invention relates to a heat transfer mat temperature controller, and in particular, a phase control temperature control circuit and a timer and a noise filter circuit using a microcomputer are provided so that the operation of the heat transfer mat is automatically performed by a timer when the set time is not forgotten by the user. It is to be used more conveniently and safely by stopping.

In general, the heat transfer mat equipped with a temperature controller is easy to use and easy to move because it is easily heated when laid on the floor and supplied with power.

Conventional electrothermal mat controller adopts prevolt circuit for general use at 110V or 220V, but the circuit configuration is complicated, and the temperature is controlled by connecting the heating wire of the thermal wire to the anode side of the output element, so that the incorrect temperature control It is done.

That is, the positive (+) (-) AC power is directly applied to the heating wire of the heat-sensitive wire, and heat is generated. Especially, the AC power of the (-) component applied to the heating wire is a nylon positioned between the heating wire and the temperature detection wire constituting the thermal wire. Since the leakage is induced through the thermistor (Nylon Thermistor) to the temperature detection line (capacitive leakage current), the error of the temperature detection voltage increases and the temperature control becomes unstable.

In addition, although there is a difference in intensity (force) due to an electric field incidentally generated with heat from the heat generating means, there is a problem in that harmful electromagnetic waves (EMI) are emitted which are not good for objects or living things.

Particularly, in the case of human beings, since the human body and the heating wire are closest to each other by the user's weight, it is well known that a large amount of harmful electromagnetic waves are directly induced into the human body and thus have a very detrimental effect.

Accordingly, various types of shielding apparatuses capable of shielding harmful electromagnetic waves have been devised, but the efficiency thereof is low, and a separate shielding circuit is additionally configured to increase manufacturing costs. For example, if the shield is not shielded by using a probe and the shield is not shielded, the manual heating mat in which the user switches the power plug to the opposite terminal of the outlet to shield against harmful electromagnetic waves may be necessary due to the risk of leakage and troublesome use. The situation is avoiding use.

In addition, the ON / OFF control method using a temperature sensor (thermistor) is unable to heat the entire heating mat uniformly by partial temperature control, causing severe temperature deviation, and not only a high risk of fire due to partial overheating of the heating mat. Similarly, there is a problem of low shielding efficiency.

The present invention has been made to solve the above problems, and includes a phase-controlled temperature control circuit and a timer and a noise filter circuit using a microcomputer, so that the operation (heating) is performed by a timer when the set time is not forgotten by the user. The purpose of the present invention is to provide a heat transfer mat temperature controller that can automatically and automatically control heat transfer mats such as electric yaw and electric sheet by using 90V ~ 250V universal AC power.

In addition, the heat transfer mat temperature controller of the present invention adopts a cathode driving method in which an output element of an output part, for example, a heating line of a heat sensitive wire is connected to the cathode side of an SCR, so that an AC power source having a negative (-) component affecting temperature voltage detection is outputted by the output element. It is an object of the present invention to provide a heat transfer mat temperature controller that can remove the unnecessary current through the nylon thermistor to the temperature detection line to achieve more accurate and stable temperature control.

In addition, the heat transfer mat temperature controller according to the present invention, when the heating wire and the temperature detection line is shorted due to the overheating of the thermal wire or insulation breakdown, the thermal resistance of the thermal contact and physical contact with the protection resistor is overheated. In the case of a short circuit, the fuse is melted and the power is cut off to prevent overheating, thereby providing an improved heat transfer mat temperature controller.

In addition, the heat transfer mat temperature controller of the present invention has an object to provide a heat transfer mat temperature controller that can use a universal AC voltage of AC90V ~ AC250V without voltage switching.

Noise filter unit for blocking and / or absorbing and removing unwanted noise and noise generated by the temperature controller included in the AC power source, and the overcurrent and overheat cutoff unit for protecting the temperature controller from overcurrent and overheating to achieve the above object. Temperature setting unit for setting the temperature, half-wave constant voltage unit for supplying half-wave voltage to the temperature setting unit, comparing the temperature by the phase control method and detecting the voltage of AC power to generate heat with the same power regardless of voltage (90V ~ 250V) Comparing and igniting part of free volt control system, comparing power source and / or control power source to AC power source to prevent overheating of heating part by abnormal trigger, heat source for heating and temperature comparison Temperature detection and heating unit for providing the temperature detection voltage required for the control signal output from the comparison and the trigger unit It is composed of an output unit for controlling the heat generating unit, a timer unit for terminating the operation of the temperature controller when the set time, and a DC constant voltage unit for supplying a DC constant voltage to the timer unit.

The timer unit includes a setting unit for setting an operation time, a microcomputer having a timer function, and a plurality of display units. A preset time such as 1 hour, 3 hours, 5 hours, or 1 hour, 2 hours, 5 hours, or 2 hours, 3 hours, 8 hours, etc. can be set through the setting unit constituted by the push switch. The indicator of the display part corresponding to the set time is turned on by the timer function of the microcomputer. Of course, you can set the time in units of 30 minutes.

The noise filter unit absorbs and blocks the noise flowing through the AC power source 110V / 220V, and EMI and / or EMC generated when the output element SCR constituting the output unit is phase controlled are smoothed out by a capacitor.

In case of overcurrent and overheat cut-off, fuse is melted in case of short circuit of component or circuit, and the circuit is protected.If the heat-sensitive layer (nylon thermistor) that forms part of the thermal wire melts due to temperature control or malfunction, AC fuse is cut off. Overheating is prevented.

The heating means (heating wire) used in the present invention is a flexible heat-sensitive thermal wire, a heating wire wound by a plurality of copper or nichrome wire on the outer circumferential surface of the insulation core to generate heat, and a nylon thermistor coated on the outer circumferential surface of the heating wire. Insulation member such as (Nylon Thermistor), a temperature detecting line having a PTC resistance characteristic wound around the outer surface of the insulating member and functioning as a temperature sensor and electric field shielding, and an insulating member covering and covering the outer surface of the insulating member and the temperature detecting line with a predetermined thickness. It is in the form of a flexible wire consisting of, the heating wire has a uniform pitch and the same center and the same size, the winding direction is opposite to each other effectively shield or offset the magnetic field.

That is, as the direction of current flowing through the heating line is exactly opposite, the directions of the magnetic fields generated from the heating line are opposite to each other and the amount of current flowing is the same, so that the magnetic fields formed on the heating line cancel each other and the magnetic field is shielded.

In addition, the temperature detection line having a PTC resistance characteristic changes the electrical resistance in proportion to the heating temperature of the heating wire, and precisely detects the heating temperature by the voltage difference using the electrical resistance change.

In describing the present invention, the same elements in the drawings are denoted by the same reference numerals as much as possible, and detailed descriptions of related well-known structures or functions will be omitted in order not to obscure the subject matter of the present invention.

1 is a circuit block diagram of a heat transfer mat temperature controller of the present invention used for heating an electric mat, such as an electric yaw and an electric field plate, and FIG. 2 is a detailed circuit diagram of one embodiment.

The heat transfer mat temperature controller blocks and / or absorbs and removes the noise generated by the AC power supply unit 1 and the AC power supply unit AC and the AC power control unit, and the output element SCR of the output unit is switched. Noise filter unit 2 for absorbing and removing high frequency noise generated at the time, overcurrent and overheat cutoff unit 3 for protecting the heat transfer mat temperature controller from overcurrent and overheating, and temperature setting unit 5 for setting the heating temperature And a half-wave voltage unit 4 for supplying half-wave voltage to the temperature setting unit, a power supply voltage detector 6 for detecting an advanced power supply voltage, and a temperature control method for comparing and controlling the temperature by a phase control method. By the free volt comparison and trigger unit 9 which maintains a constant power consumption of the thermal line H even if the power supply voltage detected by And / or control power is alternating The fastening part 8 which prevents the heat generating part 7 from being overheated by an abnormal trigger by allowing it to advance above a circle, and the temperature detection and heat generating part 7 which provide the temperature detection voltage required for temperature comparison with the heat source required for heating. When the control signal is output from the comparison and trigger unit 9, an output unit 10 for controlling the heating unit and a timer for ending the operation of the heat transfer mat temperature controller when the set time is reached using a microcomputer having a timer function. It consists of a part 12 and the DC constant voltage part 11 which supplies a DC constant voltage to the timer part 12.

The timer unit 12 includes a setting unit 13 capable of setting an operation time, a microcomputer 14 having a timer 15 function, a plurality of display units 16 connected to an output of the microcomputer U, It is composed of a photo coupler (PC) for transmitting the timer control signal to the comparison and trigger unit (9).

The preset time, for example, 1 hour, 3 hours, 5 hours, or 1 hour, 2 hours, 5 hours, or 2 hours, 3 hours, 8 hours, etc., is set through the setting unit 13 constituted by the push switch. The indicator of the display unit 16 corresponding to the set time is turned on by the timer function of the microcomputer 15.

The AC power supply unit 1 is supplied with commercial AC power 110V / 220V through the first and second AC power lines AC1 and AC2.

The noise filter unit 2 is connected in parallel between the line filters L1 and L2 connected to the first and second AC power lines AC1 and AC2, respectively, and the first and second AC power lines AC1 and AC2. EMI and / or generated when capacitor C1 and resistor R1 are absorbed and blocked by high frequency noise flowing through AC power 110V / 220V, and output element S constituting the output is phase controlled. Or EMC is smoothed off by capacitor C1.

The overcurrent and overheat cut-off unit 3 includes a fuse F, a temperature fuse TF, resistors R4 and R6 which are in physical contact with the temperature fuse TF so as to have excellent thermal conductivity, and the resistance ( The diode D1 is connected in series with the first AC power line AC2 through R4), and the fuse is melted when the component or the circuit is shorted to cut off the AC power, thereby protecting the circuit.

And the heat sensitive line H is overheated by temperature control or malfunction, and the heat sensitive layer (nylon thermistor) between the heating line H1 (H2) and the temperature detection line S1 (S2) has become overheated by the heat sensitive line H. When melted, the temperature detection lines S1 and S2 and the heating lines H1 and H2 are short-circuited, so the resistor R4 generates heat by the half-wave current supplied from the diode D1, and the heat fuse TF is used as the heat. Therefore, AC power is cut off and overheating is prevented.

In addition, the output element S may be overheated due to overcurrent.The resistor R6 generates heat due to the half-wave current of the diode D5, and as the heat fuses the temperature fuse TF, the AC power is cut off and overheating is prevented. Is maintained.

The heat detection line H constituting the temperature detection and heat generating unit 7 is a heating line H1 (H2) for generating a heating temperature, and a temperature detection line S1 for detecting a temperature generated from the heating line (H1) (H2). ) S2, an insulation core K, an insulation member N, an insulation member K2, and the like.

4 illustrates an example of the thermal line H. The heating line H1 reciprocates in the opposite direction to the outer circumferential surface of the insulation core K by the return unit HC so as to cancel the magnetic field and generates heat. ) H2, an insulation member (N: Nylon Thermistor, etc.) coated with a predetermined thickness on the outer circumferential surfaces of the heating wires H1, H2, and the outer circumferential surface of the insulation member N to detect the heating temperature and shield the electric field. Flexible wire composed of a temperature detection line (S1) (S2) having a PTC resistance characteristic and a closing insulation member (K2) coated with a predetermined thickness on the outer peripheral surface of the insulation member (N) and the temperature detection line (S1) (S2). Form

The phase-controlled temperature control part of the present invention is composed of a half-wave constant voltage part 4 composed of resistors R2, R3, D3, and Zener diode ZD2, a variable resistor VR1, VR2, and a resistor R5. Temperature setting section 5, diodes D4, D8, capacitors C2, C5, transistors Q1, Q2, resistors R8, R9, R10, R13, and output element S And a power supply voltage detector (6) consisting of a capacitor (C3) (C4), a resistor (R11) (R12), and a diode (D6). The current set as the variable resistor VR1 in the controller passes through the temperature detection lines S1 and S2 and leaks through the heat-sensitive layer (nylon thermistor) to the heating line H1 and H2, thereby reducing and reducing the diode D4. The capacitor C2 is charged with a voltage inversely proportional to the temperatures of the heating lines H1 and H2 and supplied to the input of the comparison circuit, for example, the emitter of the transistor Q1.

Preferably, the set temperature voltage range is set by the variable resistor VR2 and then the set temperature voltage is finely set by the variable resistor VR1. Accordingly, the variable resistor VR2 is preferably a semi-fixed resistor.

In addition, the resistors R2 and R3 connected to the first AC power line AC1 are connected in parallel so as to be divided so as to extend the life of the resistors R2 and R3, to stably protect the circuit, and to reduce manufacturing costs. Make savings possible.

In addition, the current advanced by the capacitor C3 of the power supply voltage detector 6 is divided by the resistor R11 and another resistor R12 connected in series, and the comparison input of the comparison circuit through the diode D8, such as a transistor. When the temperature detection voltage is higher than the comparison input voltage by the temperature setting section 5, the transistors Q1 and Q2 are turned on so that the output element S is triggered and the heating line H1 and H2 are supplied to the base of Q1. The power is supplied to the heat generating operation.

In this case, the comparative input voltage is proportional to the power supply voltage, and the triggering time of the output element S is proportional to each other. When the voltage is high, the conduction angle of the output element S is narrowed. Even if it loses, the power consumption of the thermal wire is kept constant, so it can be used in the free volt method.

In addition, the timing of triggering the set current of the variable resistor VR1 is inversely proportional to temperature control.

As shown in FIG. 4, the temperature detection and heat generating unit 7 has a heating wire H1 (H2), which is a primary winding, wound around a periphery of the insulation core K, such as polyester, at regular intervals, and thereon, a thermal layer (nylon thermistor). ) Is applied to a certain thickness, and the temperature detection line (S1) (S2), which is the secondary winding, is wound to a predetermined thickness, and is composed of a structure in which heat-resistant and insulating synthetic resin is finally applied thereon as an outer skin. The primary windings generate heat, and the temperature detection lines S1 and S2 having PTC resistance characteristics are transferred to a circuit by detecting a change in electrical resistance according to a temperature change. K2) will prevent the short circuit.

The timer unit 12 includes a DC constant voltage unit including a capacitor C6, C7, a resistor R14, a diode D9, D10, and a zener diode ZD1 to supply a DC constant voltage to the microcomputer U. (11), at the time of power supply (POWER SWITCH ON) an arbitrary operating time is set, the corresponding display elements (D11) (D12) (D13) consisting of light emitting diodes (LEDs) are turned on, and the time setting switch ( When the TS is operated, it is changed to a desired time (for example, 1 hour, 3 hours, 8 hours, etc.), and the comparison and trigger unit 9 is stopped for a time set by the timer function of the microcomputer U and then stopped.

The light transmitting element of the photocoupler PC connected between the output of the microcomputer U and the comparison and triggering unit 9 is composed of a photo LED and the light receiving element is composed of a photo triac (TRIAC). Is transmitted to the comparison and trigger unit 9, and the light emitting side LED is turned on / off by the microcomputer (U), and the input voltage of the comparison and trigger unit 9 is turned on / off by the light receiving side triac (TRIAC). Controlled.

On the other hand, when the power is supplied, the light emitting diode D14, which is a power lamp, is turned on, and in this state, continuous (continuous) heat is generated at a set temperature unless the power is turned off.

When the user sets the operation time to 1 hour by pressing the time setting switch TS once, the light emitting diode D11 is turned on for 1 hour, and the heat generating part generates heat for 1 hour at the set temperature and then the power is cut off. This stops.

When the user sets the operation time to 3 hours by pressing the time setting switch TS twice, the light emitting diode D11 is turned on for 3 hours, the heat generating part is heated for 3 hours at the set temperature, and the set 3 hours have elapsed. When the output of the microcomputer U becomes “H”, the light emitting device of the photocoupler PC is turned off and turned off, and the triac of the photocoupler PC is turned on to turn on the resistor R21. Bypassing through, the heating signal applied to the emitter terminal of the transistor (Q1) is removed, the output of the trigger signal is interrupted, the power is cut off as the output element (S) is triggered off (Off), the thermal line (H) Fever will stop.

On the contrary, when the continuous operation or the set time is not reached, the output of the microcomputer U becomes "L", the light emitting element of the photocoupler PC is turned on and turned on, and the triac of the photocoupler PC is turned on. Since the heating signal is applied to the emitter terminal of the transistor Q1 while being turned off, the comparison and triggering unit 9 is normally operated and controlled to generate heat at a set temperature.

When the user sets the operation time to 8 hours by pressing the time setting switch (TS) three times, the light emitting diode (D11) is turned on for 8 hours, and the heat ray (H) is also heated for 8 hours at the set temperature. The heat stops as the power is cut off.

When the user presses the time setting switch TS four times, the operation of the timer unit 12 is stopped, and heat generation of the thermal line H is continuously performed at the set temperature without time limitation.

Time setting of the timer unit is one hour, three hours, and eight hours as an example, but of course, the times can be appropriately changed according to the user's convenience.

In the present invention, since the free voltage method is set to a predetermined temperature, the power consumption of the thermal line H is constant regardless of the voltage of 110V / 220V, and thus it can be used universally (90V ~ 250V) without voltage classification. Even if the user forgets by the timer function and does not turn off the thermostat temperature controller of the present invention, the heat generation is automatically stopped after a set time, and thus overheating is prevented and convenient and safe to use.

The heating lines H1 and H2 of the thermal line H shown in FIG. 4 are wound around each other by the return unit HC in the opposite direction, so that more than 95% of the magnetic fields are offset and removed. As the material of (K), heat-resistant polyester yarn or heat-resistant glass fiber yarn is generally used, nylon thermistor (N) is used as a material having heat resistance and insulation, and the insulation member (K2) is a heat-resistant and insulating rubber material Silicone or synthetic resin material is mainly used.

The insulation cores K, the insulation members N, K2, the heating wires H1, H2, and the temperature detection lines S1, S2 are soft or flexible so as to wind or spread the heat transfer mat. Or have such physical properties. The temperature detection lines S1 and S2 of the PTC resistance characteristic change in proportion to the resistance value according to the temperature change transmitted from the heating lines H1 and H2.

That is, the temperature detection line (S1) (S2) of the PTC resistance characteristics is a heating wire (A method of detecting a resistance change proportional to the temperature change transmitted from the heating line (H1) (H2) through the nylon thermistor (K1). The temperature of H1) (H2) can be detected correctly.

In the present invention, the temperature detection line (S1) (S2) from the heating line (H1) (H2) through the nylon thermistor (N), which connects the thermal wire (H) to the cathode side of the output element (S) to function as a capacitor When the leakage current induced by the current flows to the second AC power line AC2 corresponding to the ground, the voltage deviation is eliminated when the temperature voltage is detected by the temperature detection lines S1 and S2, so that more stable and reliable temperature control is achieved. Will be done.

On the other hand, the insulation wire is broken due to repeated bending of the wire-shaped thermal wire H, external pressure, and melting of the insulating member N (melting point about 150 ° C.), and thus, the heating wire H1 and the temperature detection line S1. When S2 is shorted, the output element S is turned on. In this case, the potentials of the heating lines H1 and H2 and the temperature detection lines S1 and S2 have the same potential. The temperature detection is not made.

That is, the short circuit between the heating line H1 (H2) and the temperature detection line S1 (S2) prevents the input of the comparison and trigger unit 9 from recognizing the overvoltage and the output element S continues to be in a conductive state. Since the overheating causes overheating, the overheating heat H and the heat transfer mat may be gradually overheated and fired, but the overheat cutoff portion 3 prevents overheating of the heat sensitive line H.

The overheat cut-off unit 3 is composed of a resistor R6 connected in series with both ends of the heating line H1 and H2, a diode D5, and a temperature fuse TF in which the resistor R6 is in physical contact with each other. .

The resistor R5 is configured to be in physical contact with the surface (or inside) of the temperature fuse TF so as to effectively transfer heat to the temperature fuse TF. Therefore, when the heating line H1, H2 and the temperature detection line S1, S2 are short-circuited, the overcurrent rectified by the diode D5 is overheated while flowing to the resistor R5, and the temperature fuse is physically in contact with it. Since the TF is fused and the AC power applied to the thermal wire H is cut off, overheating or fire of the heat transfer mat is prevented, and thus, the heat transfer mat temperature controller of the present invention is protected.

Another overheat cut-off part 3 which prevents overheating of the thermal line H from the short circuit of the output element S includes a resistor R4 connected to the temperature detection line S1, and the resistor R4. And a cathode of the diode D1 is connected to the first AC power supply line AC1 and is in a reverse direction to the current flow direction of the output element S. The diode D1 is connected to the first AC power supply line AC1.

Therefore, when the output element S is turned on, AC power flows to the heating lines H1 and H2 as usual, and when the output element TH is shorted, most of the current flows through the diode D1. (R4) is overheated and the temperature fuse (TF) is fused, thereby blocking the AC power applied to the thermal line (H) to prevent overheating or fire of the heat transfer mat and protect the heat transfer mat.

3 is a signal waveform of each part of the present invention, (a) is an AC power supply (AC) waveform, the trapezoidal waveform of (b) is an emitter partial waveform of the transistor Q1, and the pulse wave waveform overlapping this is a true phase portion. (8) is a waveform advanced by the capacitor C3, (c) is an emitter partial waveform of the transistor Q2, and (d) is a cathode partial waveform of the output element S. As shown in FIG.

On the other hand, when the power switch SW is turned ON and the AC power supply AC110V / AC220V is supplied through the first and second AC power supply lines AC1 and AC2, the DC constant voltage obtained by the DC constant voltage unit 11 is a microcomputer. It is supplied to U and the display element, and the power indicator D14 is turned on, so that power is supplied to the heat mat temperature controller and that it is in normal operation.

When the circuit is overloaded or the output element S is shorted by the overcurrent and overheat cutoff unit 3, the fuse F is melted and the AC power AC is cut off to protect the circuit components. That is, the resistor R4 connected to the temperature detection line S1 has a configuration in which the resistance R4 is in physical contact with the surface (or inside) of the temperature fuse TF so as to effectively transmit heat, and the heating line H1 and H2. When the temperature detection line S1 and S2 are shorted, the resistor R4 is overheated by the overcurrent supplied through the diode D1, and the temperature fuse TF is melted and the power supply is stopped. Overheating is prevented.

On the other hand, the heat sensitive line (H) can be configured to be temperature controlled by connecting to the anode side or the cathode side of the output element (S), in the present invention, the heating line (H) of the heat sensitive line (H) on the cathode side of the output element (S) By connecting H1) (H2) so that the AC power of (-) component is removed by the output element, it is guided to the temperature detection line S1 (S2) through the insulating member N, which may cause an error in temperature voltage detection. By removing the factor, temperature detection and stable temperature control are achieved.

When the output element S is short-circuited, the diode D5 connected in series with the output element S has an overcurrent flowing in the forward direction and the fuse F is melted, so that the AC power supply is cut off and the overheat of the thermal line H is prevented. Also, since the resistor R6 is overheated by the overcurrent flowing through the output element S and the diode D5, the temperature fuse TF is melted.

On the other hand, when temperature is controlled by the phase control method, switching noise in a wide frequency band is generated by sudden power consumption when the output element S is triggered, which may cause a malfunction of a circuit or influence or interference to surrounding electrical and electronic equipment. However, in the present invention, most of the noise is absorbed and smoothed by the noise filter unit 2 including the line filters L1 and L2, the capacitor C1, the resistor R1, and the like.

The present invention described above is capable of various substitutions and modifications within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited.

As described above, the heat transfer mat temperature controller includes a phase control temperature control circuit, a timer using a microcomputer, and a noise filter circuit, which can be applied to heat transfer mats such as electric yaw and electric blanket, and is used for general purpose AC power supply of 90V to 250V. Even if the user forgets by the timer and does not turn off, the timer automatically stops heat generation after the set time has elapsed, and overheating is prevented by the overheat prevention means, thereby improving convenience and safety. When the heating wire and the temperature detection line are shorted or the output unit (output element) is shorted due to overheating, the temperature fuse is fused to prevent overheating and electrical safety accidents.

According to the present invention, even if the phase control (power control) method is used, temperature detection and control are accurate and reliable, and the noise filter unit eliminates broadband noise (radio wave propagation) and thus does not affect the circuit malfunction or the surrounding electrical and electronic equipment. No, there is an effect such that the generation of harmful electromagnetic waves is suppressed.

In addition, in the present invention, the heating wire of the thermal wire is reciprocally wound in the opposite direction, so that the magnetic field generated from the heating wire cancels each other.

In addition, the present invention connects the thermal line to the cathode side of the output element to flow the current (capacitance leakage current) leaking through the nylon thermistor to the ground to remove the unnecessary current induced by the temperature detection line more accurate and stable There is an effect that the temperature control is made.

Claims (3)

In the heat transfer mat controller which controls a temperature by interrupting the power supplied to a thermal line through the 1st, 2nd AC power supply line AC1 (AC2); Noise filter unit for absorbing and eliminating unnecessary noise and high frequency noise generated in the circuit, overcurrent and overheat protection unit for protecting the temperature controller from overcurrent and overheating, and temperature setting unit for setting the heating temperature And a half-wave constant voltage unit for supplying the half-wave constant voltage to the temperature setting unit, a power supply voltage detector for detecting the advanced power supply voltage, and a temperature control by comparing the temperature by a phase control method and changing the power supply voltage detected by the power supply voltage detector. It provides a comparison and trigger unit of the pre-volt control method that keeps the power consumption of the thermal wire constant, an advanced unit that prevents overheating by advancing the control power supply from the AC power source, and a temperature detection voltage necessary for comparing the heat source and temperature required for heating. The temperature detection and heat generating unit, and the control unit outputs The output unit comprises a output unit, a timer unit for terminating the operation of the temperature controller when the set time is reached, and a DC constant voltage unit for supplying a DC constant voltage to the timer unit, and between the output element cathode of the output unit and the second AC power line AC2. Temperature controller of heat transfer mat by connecting thermal wire. The method according to claim 1; A temperature controller of a heat transfer mat, comprising a setting unit for setting an operation time, a microcomputer having a timer function, a plurality of display units connected to an output of the microcomputer, and a photo coupler for transmitting a timer signal. The method according to claim 1 or 2; The heating wire is a heating wire which is reciprocated in the opposite direction by the return part on the outer winding surface of the insulation winding to generate heat, an insulating member coated on the outer peripheral surface of the heating wire with a predetermined thickness, and wound around the insulating member outer peripheral surface to detect the heating temperature, And a flexible wire composed of a shielding temperature detection line having a PTC resistance characteristic and a closing insulation member coated with a predetermined thickness on an outer circumferential surface of the insulation member and the temperature detection line.

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