KR20080013685A - Temperature controller and the method using double timing signal - Google Patents

Abstract

A temperature controller and a temperature controlling method are provided to measure an overheat of a heating line accurately by detecting the overheat at an NTC(Negative Temperature Coefficient) thermistor before detecting the overheat of the heating line. A first temperature signal voltage supply unit(100) is connected to a source side of a heating line and supplies a first signal voltage to the heating line. A first temperature signal voltage detector(300) is connected between first and second heating lines on the other side of the heating line, and determines whether a first signal voltage is received from the first temperature signal voltage supply unit. A second temperature signal voltage supply unit(400) supplies a second signal voltage to one end of the second heating line. A second temperature signal voltage detector(500) is parallel-connected with the second heating line and detects the second signal voltage from the second temperature signal voltage supply unit. When a high voltage is detected at the first temperature signal voltage detector and a low voltage is detected at the second temperature signal voltage detector, a controller supplies a heating current.

Description

Electromagnetic Interception Thermostat and Temperature Control Method {Temperature controller and the method using Double Timing Signal}

1 is a circuit diagram showing a state in which a thermostat and a heating line of the present invention are connected.

FIG. 2 is a circuit diagram showing the circuit diagram of FIG. 1 in detail.

3 is a circuit diagram illustrating a safety circuit added to the circuit diagram of FIG. 2.

FIG. 4 is a circuit diagram illustrating an amplifier circuit added to the circuit diagram of FIG. 3.

5 is a view for explaining the first temperature detection and the second temperature detection according to the operating method of the present invention.

6 is a view for explaining the heating and heating stop operation according to the operation method of the present invention.

7 is an equivalent circuit diagram for explaining the first temperature detection.

8 is an equivalent circuit diagram for explaining the second temperature detection.

9 is a circuit diagram showing a state in which another thermostat and a heating line of the present invention are connected.

10 is a view for explaining the temperature detection according to the operating method of the present invention according to the circuit diagram of FIG.

<Description of Symbols for Main Parts of Drawings>

11: first heating wire 12: second heating wire

13: NTC plastic nylon thermistor 14: outer coating

16: shield 100: first temperature signal voltage supply unit

200: trigger input unit 300: first temperature signal voltage detection unit

400: second temperature signal voltage supply unit 500: second temperature signal voltage detection unit

600: synchronization input unit 700: control unit

800: control input and output unit 900: power supply unit

The present invention relates to a non-magnetic thermostat and a temperature control method of a heating wire for bedding, which can be heated and short-circuit detection magnetically without shorting one end of the heating wire used for a heater such as an electric blanket, electric yoke, electric steamer, etc. More specifically, when the first heating element and the second heating element arranged parallel to the inner and outer surfaces of the NTC plastic nylon thermistor (or NTC thermistor) are overheated, the NTC sub-characteristics of the NTC plastic nylon thermistor and the heating element itself are reduced. The present invention relates to a thermostat and a method for controlling heating power and reducing temperature without a temperature sensor by detecting a temperature in the heating wire itself through a PTC positive characteristic of increasing internal electrical resistance.

Electric heating bedding, such as electric blanket, electric yoke, electric steamer, the heater has a heating wire is built-in, when the power supply to the heating wire generates heat. Therefore, a temperature controller for sensing the temperature around the heating wire or controlling the power supply according to the user's selection is essentially configured.

The conventional bedding heating wire has shorted one end of two metal heating wires arranged in parallel, and is equipped with a separate temperature sensing sensor separated from the heating wire to detect temperature. However, the method of separating the temperature sensor and the heating wire has a problem that not only does not detect the temperature of the entire heating wire caused by a short circuit inside the heating wire, but also does not detect local overheating at an arbitrary position. Therefore, when the heating wire is locally overheated or short-circuit and disconnection, there is a problem that a fire and an electric shock may occur.

As another conventional method, a method of detecting a temperature with a third wire by adding a separate temperature sensor to an outer circumferential surface or an inner center surface of which two ends are short-circuited among two metal heating wires arranged in parallel is used. However, since the temperature sensor layer and the third metal layer are added to the heating wire without the separation from the heating wire, the thickness of the non-magnetic heating wire is increased so that it cannot be used for thin bedding, and the heating wire is produced. There are problems such as complicated process and rising production cost.

In addition, the above-mentioned prior arts have to have a separate temperature sensor, so that the thickness is thick, which impairs practicality, or the temperature control performance of the heating wire is not good.

On the other hand, an improved method of controlling temperature using an NTC plastic nylon thermistor without using a temperature sensor has also been filed by the applicant. In addition to the primary overheat detection and control by the NTC plastic nylon thermistor, additional overheat detection and There is a need to increase the reliability of overheat protection through control and to enable faster and more precise temperature control.

The present invention, by using NTC plastic nylon thermistor and PTC, primarily detects overheating in NTC plastic nylon thermistor, and secondly detects overheating in PTC, so that more rapid and reliable temperature controller and temperature control method for overheating prevention The purpose is to provide.

According to the present invention, a temperature controller generates a first and second temperature detection synchronization signal in the temperature controller, and first checks whether the heating wire is overheated by the synchronization signal, and controls the flow of the heating current according to the state of the read signal. And it aims to provide a temperature control method.

According to the present invention, the AC power half wave is used for temperature detection, the other half wave is used for heating, and the PTC temperature detection is used to detect PTC temperature at the zero point of the AC power to avoid interference of the AC power. The goal is to provide a method.

The configuration of the present invention for achieving the above object, the first and second heating wires arranged in parallel with each other and connected so that the current input to any heating wire is turned into the other heating wire and the NTC thermistor wound therebetween. The second heating wire is connected to a heating wire, and the second heating wire is made of a static material that increases internal electrical resistance when the temperature is raised, and whether the first heating wire and the second heating wire are overheated, disconnected, short-circuited or shorted. Detecting by the signal to detect the temperature primarily through this detection signal state, and detecting by the second synchronous signal whether the second heating wire itself is overheated and detecting the second temperature by this detection signal state, And a control unit for outputting a heating signal when the first temperature detection and the second temperature detection are intact. Flows through any one of the first and second heating wires. The current is again to be out flow through the other of the first heating element, being the current direction flowing through the second heating element in opposite directions to offset each other due to the magnetic field electric current is characterized by forming a brutal system.

A first temperature signal voltage supply unit connected to a power supply side of the heating wire to supply a first signal voltage; A first temperature signal voltage detection unit connected to the other side of the heating wire between the first heating wire and the second heating wire to detect whether a first signal voltage supplied from the first temperature signal voltage supply unit is received; A second temperature signal voltage supply unit for supplying a second signal voltage to one end of the second heating wire; And a second temperature connected in parallel to the connection portion of the second temperature signal voltage supply part, the second heating wire, and the other end of the second heating wire to detect the second signal voltage supplied from the second temperature signal voltage supply part. And a signal voltage detector, wherein the controller detects a voltage higher than a predetermined level in the first temperature signal voltage detector, and a voltage applied to both ends of the second heating wire in the second temperature signal voltage detector. If detected, it is characterized by supplying a heating current.

The control unit does not supply a heating current when the signal voltage is detected by the first temperature signal voltage detection unit below a predetermined voltage.

The first signal voltage supplied from the first temperature signal voltage supply unit is input to any one of the first and second heating wires, and when the NTC thermistor is below a predetermined temperature, the first signal voltage detection unit detects and turns the first temperature signal voltage detector. When the NTC thermistor exceeds a predetermined temperature, all or part of the NTC thermistor is u-turned.

The first signal voltage is characterized in that is applied periodically in the input half-wave of the AC power supply from the first temperature signal voltage supply.

Arranged in parallel with each other and the current input to one heating wire is connected to the heating wire including the first and second heating wires connected so that the U-turn is output to the other heating wire and the NTC thermistor wound therebetween, and the second heating wire is the internal electricity at the temperature It is made of a static material with increasing resistance, and detects whether the second heating wire itself is overheated by a second synchronous signal and detects the temperature through this detection signal state, and if there is no abnormality in the second temperature detection, the heating signal. And a control unit for outputting the current flowing through any one of the first and second heating wires so that the current flowing through the other heating wires flows again through the other heating wires so that the current directions flowing through the first and second heating wires are opposite to each other. The magnetic fields due to this current cancel each other to form a magnetic field.

A second temperature signal voltage supply unit for supplying a second signal voltage to one end of the second heating wire; And a second temperature signal connected in parallel to the connection of one end of the second temperature signal voltage supply part, the second heating wire, and the other end of the second heating wire to detect the second signal voltage supplied from the second temperature signal voltage supply part. And a voltage detector, wherein the controller is configured to supply a heating current when the voltage across the second heating wire is detected by the second temperature signal voltage detector.

The control unit does not supply a heating current when the voltage applied to both ends of the second heating wire in the second temperature signal voltage detection unit exceeds a predetermined level.

The second temperature signal voltage detection unit may be configured to detect a value of the second signal voltage supplied from the second temperature signal voltage supply unit at both ends of the second heating wire and send it to the controller.

The second temperature signal voltage detection unit: when the temperature signal voltage across the second heating wire is low, it is characterized in that amplified directly to the control unit and sent to the controller.

The second signal voltage is periodically applied by a separate input power from the second temperature signal voltage supply.

The second signal voltage may be applied at a zero phase time point of the AC current applied to the heating line from the power supply.

The second temperature signal voltage detection unit includes: an amplifier for amplifying the detected second temperature signal; And a setting volume for setting a reference voltage for comparison with the amplified second temperature signal.

The second temperature signal voltage detection unit includes a rectifying element for controlling the reverse voltage, and a heating voltage applied to the first and second heating wires protects the second temperature signal voltage supply unit and the second temperature signal voltage detection unit. do.

Arranged in parallel with each other and the current input to one heating wire is connected to the heating wire including the first and second heating wires connected so that the U-turn is output to the other heating wire and the NTC thermistor wound therebetween, and the second heating wire is the internal electricity at the temperature In a method for blocking heating when a heating element having a PTC positive characteristic with increasing resistance is heated to a high temperature of a certain level or more, the first temperature signal voltage supply unit detects a temperature every half of a cycle for detecting temperature during an AC power cycle. A first signal voltage generation step of generating a first signal voltage at a cycle voltage; A first signal voltage detection step of detecting a first signal voltage output from the first temperature signal voltage supply part through a heating wire of one of the first and second heating wires and detected by a first temperature signal voltage detection part connected to the other end of the heating wire; ; A synchronization signal generation step of generating a synchronization signal for detecting the second temperature signal voltage by a program of the controller; A second signal voltage generating step of generating, by the second temperature signal voltage detection synchronization signal, a second signal voltage at a predetermined interval from the second temperature signal voltage supply unit to the second heating wire; A second signal voltage that detects a voltage across the second heating wire in a second temperature signal voltage detection unit connecting the second temperature signal voltage supplying unit, the connection of one end of the second heating wire and the other end of the second heating wire in parallel; Detecting step; And a heating current is applied to the heating line only when a voltage above a predetermined level is detected in the first signal voltage detection step and a voltage below a predetermined level is detected in the second signal voltage detection step, and the first signal voltage detection is performed. And a heating control step of not supplying a heating current when the voltage is detected at a step below a predetermined level or when the voltage is detected at a second level above the predetermined level in the second signal voltage detection step.

When the voltage is detected below the predetermined level in the first signal voltage detection step, or when the voltage is detected above the predetermined level in the second signal voltage detection step, the voltage exceeds the predetermined level in the first signal voltage detection step. Is detected, and when the voltage is detected below the predetermined level in the second signal voltage detection step, the heating current is supplied again.

Arranged in parallel with each other and the current input to one heating wire is connected to the heating wire including the first and second heating wires connected so that the U-turn is output to the other heating wire and the NTC thermistor wound therebetween, and the second heating wire is the internal electricity at the temperature A method for blocking heating when a heating wire having a PTC positive characteristic with increased resistance is heated to a high temperature of a predetermined level or more, comprising: a synchronization signal generating step of generating a synchronization signal for detecting a second temperature signal voltage by a program of a controller; A second signal voltage generating step of generating, by the second temperature signal voltage detection synchronization signal, a second signal voltage at a predetermined interval from the second temperature signal voltage supply unit to the second heating wire; A second signal voltage for detecting a voltage across the second heating wire in a second temperature signal voltage detection unit for connecting the second temperature signal voltage supplying unit, the connection of one end of the second heating wire and the other end of the second heating wire in parallel; Detecting step; And applying a heating current to the heating line only when a voltage below a predetermined level is detected in the second signal voltage detection step, and supplying a heating current when the voltage is detected above a predetermined level in the second signal voltage detection step. It characterized in that it comprises a heating control step that does not.

In the case where the voltage is detected above the predetermined level in the second signal voltage detection step, the heating current is supplied again when the voltage is detected below the predetermined level in the second signal voltage detection step.

The second signal voltage is periodically applied by a separate input power from the second temperature signal voltage supply.

The second signal voltage may be applied at a zero phase time point of an alternating current applied to a heating line from a power source.

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

1 is a circuit diagram showing a state in which a thermostat and a heating line of the present invention are connected. Referring to FIG. 1, an NTC plastic nylon thermistor (commonly referred to as an NTC thermistor) 13 is wound between the first heating wire 11 and the second heating wire 12, and an insulation coating is formed on the outside of the second heating wire 12. (14) is wound. When overheated, the NTC plastic nylon thermistor 13 has a low impedance and loses voltage while making a current in the middle.

On the power supply side, the first heating wire 11 is connected to the first temperature signal voltage supply unit 100 and the trigger input unit 200, and the second heating wire 12 is connected to the other side of the power supply. On the other side of the heating line 1, the first heating wire 11 and the second heating wire 12 are connected to the first temperature signal voltage detector 300.

The first temperature signal voltage supply unit 100 supplies a signal voltage to the first heating wire 11 at every half wave period of the AC power input. The signal voltage supplied at a predetermined period from the first temperature signal voltage supply unit 100 passes through the heating line 1 along the first heating line 11, flows to the opposite side, and is detected by the first temperature signal voltage detection unit 300. At the same time, the second heating wire 12 is u-turned.

NTC plastic nylon thermistor (Negative Temperature Coefficient thermistor) 13 is a resistance value decreases as the temperature increases, and as the temperature increases between the first heating wire 11 and the second heating wire 12, the resistance decreases, In addition, the first temperature signal input from the first temperature signal voltage supply part 100 flowing through the first heating wire 11 flows toward some NTC plastic nylon thermistor 13 and exits toward the second heating wire 12. At this time, the signal voltage detected by the second temperature signal voltage detection unit 300 is lower than the voltage supplied by the first temperature signal voltage supply unit 100. At this time, when the detected voltage in the first temperature signal voltage detector 300 is lower than the preset reference voltage, it is determined that it is overheated and the supply of heating current is stopped.

That is, the signal voltage supplied from the first temperature signal voltage supply unit 100 is not detected by the first temperature signal voltage detection unit 300 or is detected as a low voltage, because the heating line 1 is overheated and the internal NTC thermistor impedance This is because the value is lowered and the voltage is turned to the NTC thermistor so that the signal voltage does not come to the first temperature signal voltage detector 300 or is reduced and transmitted. In this case, the control unit 700 supplies the heating current until the signal voltage is detected in the first temperature signal voltage detection unit 300, that is, until the temperature of the heating line 1 is lowered, without having to shut down the power supply. I never do that.

Since the first temperature signal voltage detector 300 does not receive the signal voltage even when the first temperature signal voltage supply unit 100 is shorted or shorted, the controller 700 receives the first temperature signal through the reception of the signal voltage. The state of the voltage supply unit 100 may be sensed. When the first temperature signal voltage detection unit 300 does not receive the signal voltage, the controller 700 disconnects or shorts the first heating wire 11 or the second heating wire 12 of the heating wire 1, or The temperature signal voltage supply unit 100 recognizes that the circuit is disconnected or short-circuited, and cuts off the supply of the heating current.

The second temperature signal voltage supply unit 400 supplies a signal voltage to the second heating wire 12. The second heating wire 12 (optionally, the first heating wire may be selected) is made of a material having an electrical resistance temperature coefficient of (+), that is, a positive characteristic (PTC) material, so that the resistance increases as the temperature increases. . The second temperature signal voltage detector 500 is connected to both ends of the second heating wire 12 and detects signal voltages applied to both ends of the second heating wire 12. In other words, the voltage supplied from the second signal voltage supply unit 400 is applied to both ends of the second heating wire 12, and the voltage applied to both ends of the second heating wire 12 after the voltage is dropped from the second heating wire 12. Measure

The material of the second heating wire 12 is an electric resistance temperature coefficient (+), and when the heating wire 1 is overheated and heated up, the electric resistance value changes according to the temperature coefficient, and at this time, the second heating wire 12 The input second temperature signal voltage drops in direct proportion to the electric resistance value, and the voltages at both ends thereof can be measured by the second temperature signal voltage detector 500. At this time, when the voltage applied to both ends of the second heating wire 12 from the second temperature signal voltage detector 500 is greater than the reference voltage, the controller 700 determines that it is overheated and stops supplying the heating current.

The control rectifier 24 is connected in parallel with the first temperature signal voltage supply unit 100 and is turned on by a trigger signal of the trigger input unit 200. As the control rectifier 24, it is preferable to use a silicon-controlled rectifier for power control. U-turn rectifier 15 causes the heating current to flow U-turn when conducting by the trigger signal.

The synchronization input unit 600 supplies an AC power synchronization signal to the control unit 700, and the control unit 700 reads an AC power synchronization cycle input from the synchronization input unit 600 to read a first temperature during an AC power shelf cycle. After the temperature signal voltages of the signal voltage detector 300 and the second temperature signal voltage detector 500 are read, it is determined whether or not the heating is performed in a half cycle after the next AC based on this information.

The control unit 700 reads the first temperature signal voltage in a section such as c of FIG. 5 among the temperature detection zones of the AC power line cycle (a in FIG. 5), and at the zero phase point period of the AC power as shown in b of FIG. 5. The second temperature signal voltage is supplied and detected at the same time. In this zero point period, the control unit 700 sends a synchronization signal to the second temperature signal voltage supply unit 400, and simultaneously reads the temperature signal voltage of the second temperature signal voltage detection unit 500 in this synchronization signal period. The control unit 700 reads two first and second temperature signal voltages during the AC power half-cycle cycle, and determines whether to heat in the heating zone of FIG. 5A.

The control unit 700 determines whether or not the heating unit controls the first temperature signal voltage detected by the first temperature signal voltage detector 300 and the second temperature signal voltage detected by the second temperature signal voltage detector 500. Compared to the reference potential set through the temperature volume at 800, the control temperature 700 turns on the control rectifier 24 because it does not reach the heating temperature if it is within the appropriate range. When the control rectifier 24 is turned on, the first heating wire 11 and the second heating wire 12 are heated.

The control unit 700 has a first signal voltage detected by the first temperature signal voltage detector 300 is greater than or equal to a reference voltage, and the second temperature signal voltage detector 500 is caught across the second heating wire 12. The heating current is supplied only when the signal voltage is below the reference voltage. If either of these conditions is not met, heating is stopped and heating is resumed only if both conditions are met. That is, when the first temperature signal voltage is not detected as shown by the d hatched portion of FIG. 6 or when the second temperature signal voltage is detected to be higher than the reference voltage as shown by the e hatched portion of FIG. 6, heating is stopped.

If the first temperature signal voltage is not detected or the second temperature signal voltage is higher than the reference potential by the temperature control volume of the control input / output unit 800, the heating temperature of the heating wire is sufficient, and the control unit 700 stops heating. The control input / output unit 800 stops the energization of the control rectifier 24 by blocking the trigger signal of the control rectifier 24.

The control input / output unit 800 is a part configured to allow the user to set various operations and temperature control volumes as well as input and output of the control unit 700, and the power supply unit 900 supplies power to the control unit 700, or The second temperature signal voltage supply unit 400 is a part for supplying power for supplying the second temperature signal voltage.

Reference numerals 51 and 52 of the second temperature signal voltage detection unit 500 indicate that the high heating voltage and the first temperature signal voltage interfere with the second temperature signal voltage supply unit 400 and the second temperature signal voltage detection unit 500. To protect the circuit and to protect the circuit, and 51 uses a diode to prevent the high reverse voltage from being input to the second temperature signal voltage supply unit 400 and the second temperature signal voltage detector 500. Bypassing to zero volt zero potential, 52 is a diode which prevents a high reverse voltage from entering the second temperature signal voltage supply unit 400 and the second temperature signal voltage detection unit 500.

FIG. 2 is a circuit diagram showing the circuit diagram of FIG. 1 in detail. Referring to FIG. 2, when the first temperature signal voltage supply unit 100 includes a resistor 10, and the trigger input unit 200 compares the signal voltage detected according to the synchronization signal supply and is connected by normal detection, The control rectifier 24 is turned on by the trigger signal, and a heating current flows u-turn from one end of the first heating wire 11 connected to the power source to the second heating wire 12. The trigger input unit 200 is connected to the control rectifier 24, and the U-turn rectifier 15 is connected between the first heating line 11 and the second heating line 12.

The trigger input unit 200 includes resistors 21 and 22 and a photo coupler 23. The first temperature signal voltage detector 300 includes a zener diode 31, a resistor 32, and a photo coupler 33. This is connected in series.

The second temperature signal voltage supply unit 400 includes a photo coupler 42 and a resistor 41 connected in series, and the second temperature signal voltage detection unit 500 includes a resistor 53. The synchronous input unit 600 includes a resistor 61, and the control input / output unit 800 includes a volume resistor 81, resistors 82, 85, 86, and photocouples 83, 84, 87. The power supply unit 900 includes a resistor 91, a diode 92, a zener diode 95, and a capacitor 93 and 94.

The first temperature signal voltage supplied from the first temperature signal voltage supply unit 100 is detected by the first temperature signal voltage detection unit 300, and the second temperature signal voltage supply unit 400 is supplied by the DC power supplied from the power supply unit 900. The second temperature signal voltage supplied from) is detected by the second temperature signal voltage detector 500.

3 is a circuit diagram illustrating a safety circuit added to the circuit diagram of FIG. 2. Referring to FIG. 3, a circuit safety configuration is further added to the circuit of FIG. 2, and the one-way rectifier 19 denoted by A and the constant voltage zener varistor 20 are connected in series. Zener varistor 20 is bi-directional, rectifier 19 is one-way, if the control rectifier 24 is short and the temperature signal voltage for temperature detection is applied as it flows excessively than the rated voltage, it bypasses the fuse It is a function to make the operation to disconnect. When the control rectifier 24 is short-circuited, the fuse is disconnected by the overcurrent while the reverse overcurrent flows, thereby protecting the circuit from overheating.

B is used when the shield 16 is wrapped on the outside of the heating wire 1, and the heating wires 11 and 12 are overheated and the shield 16 and the second heating wire 12 are short-circuited. When the voltage is detected at 17) 18, the controller 700 cuts off the power supply. Alternatively, the second heating wire 12 may serve as a shield while covering the outside of the first heating wire 11 as a whole without a separate shield 16.

FIG. 4 is a circuit diagram illustrating an amplifier circuit added to the circuit diagram of FIG. 3. Referring to FIG. 4, the op amps 57 and 59 are provided at 500A and 500B to amplify a signal when the voltage of the second temperature signal voltage detector 500 is low, and in particular, the op amp 57. Is to amplify the low signal level of the second heating wire 12.

500A is a temperature setting comparison circuit, and 58 is a temperature setting volume. 55 and 56 in 500B are semi-fixed volumes for adjusting the amplification level. The amplified temperature signal voltage is compared with the reference voltage determined by the temperature setting volume of 58 to determine whether to heat the control unit 700.

5 is a view for explaining the first temperature detection and the second temperature detection according to the operating method of the present invention. Referring to FIG. 5, half of the AC input power is heated by temperature, and half is detected by temperature. The AC power is supplied through the first temperature signal voltage detector 100 to detect the first temperature during the half temperature cycle of the temperature detection zone. The temperature signal voltage supplied at this time is periodically supplied with the same width as shown in (c).

On the other hand, the second temperature signal voltage detects the second temperature signal voltage at the same time as the synchronization signal generation in the same cycle as (b). That is, the second temperature signal voltage detects the second temperature signal voltage at the same time as the synchronization signal generation in the same cycle as (b). The second temperature signal voltage is simultaneously detected while the second temperature signal voltage is supplied at the zero point at which the temperature detection half-wave starts at the AC input power source of (a), that is, at the zero point where there is no interference of the AC power supply voltage.

6 is a view for explaining the heating and heating stop operation according to the operation method of the present invention. Referring to FIG. 6, (a) is an AC power waveform, (b) is an AC power supply synchronization signal in the control unit, (c) is a second temperature signal voltage supply, (d) is a first temperature signal voltage detection, and (e) Is the second temperature signal voltage detection, (f) is the SCR trigger signal, and (g) is the heating wire heating current.

In the section in which the first temperature signal voltage is not detected in (d), the SCR trigger signal is not generated as in (f), and the heating operation does not proceed.

In the section in which the second temperature signal voltage is detected in (e), the SCR trigger signal is not generated as in (f), and the heating operation does not proceed.

As a result, the first temperature signal voltage is detected according to the supply of the first and second temperature signal voltages, and the heating wire is heated only when the second temperature signal voltage is low.

7 is an equivalent circuit diagram for explaining the first temperature detection. Referring to FIG. 7, the temperature detection current passes through the second heating wire 12 and is detected by the photocouple 87, and then flows toward the first heating wire 11. At this time, when the temperature of the NTC plastic nylon thermistor 13 rises, some current i-1 flows toward the NTC plastic nylon thermistor. Therefore, in the photocouple 87, a voltage lower than normal is detected. In this case, it is compared whether the first temperature signal voltage is lower than the reference voltage, and if it is low, no heating current flows.

8 is an equivalent circuit diagram for explaining the second temperature detection. Referring to FIG. 8, the second temperature signal voltage is detected at both ends of the second heating wire 12, and the photocouple 84 supplies the DC signal voltage at the zero point of alternating current and the second heating wire 12. The higher the resistance is and the higher the voltage is, the lower the voltage at the series-connected resistor 41 is, so that the voltage across both ends can be measured.

FIG. 9 is a circuit diagram illustrating a state in which another thermostat and a heating line of the present invention are connected, and FIG. 10 is a view for explaining temperature detection according to an operation method of the present invention according to the circuit diagram of FIG. 9. Referring to FIG. 9, the circuit configuration is the same as that of FIG. 2, but the first temperature signal voltage supply unit 100 and the first temperature signal voltage detector 300 are removed. In this embodiment, the overall process is the same except that the first temperature detection process is omitted.

That is, as shown in FIG. 10, the control unit 700 simultaneously supplies and detects the second temperature signal voltage in the temperature detection zone of the AC power shelf cycle (a of FIG. 5) as shown in FIG. 5B. In this period, the control unit 700 sends a synchronization signal to the second temperature signal voltage supply unit 400, and simultaneously reads the temperature signal voltage of the second temperature signal voltage detector 500 in this synchronization signal period. The controller 700 reads only the second temperature signal voltage 1 during the AC power half-cycle cycle, and determines whether to heat in the heating zone of FIG. 5A.

The determination of whether to heat the control unit 700 is within the appropriate range by comparing the second temperature signal voltage detected by the second temperature signal voltage detection unit 500 with the reference potential set by the temperature input volume in the control input / output unit 800. If not, since the heating temperature has not been reached, the controller 700 turns on the control rectifier 24. When the control rectifier 24 is turned on, the first heating wire 11 and the second heating wire 12 are heated.

The controller 700 supplies the heating current only when the second signal voltage detected by the second temperature signal voltage detector 500 across the second heating wire 12 is less than or equal to the reference voltage. If this condition is not met, the heating is stopped and heating is resumed only if it is satisfied.

The present invention primarily detects the first temperature signal voltage to detect the overheat in the NTC plastic nylon thermistor disposed between the two heating wires, and secondly to detect the overheating in the PTC second heating wire By detecting the second temperature signal voltage, it is possible to detect the overheat double, thereby providing a safer and more reliable overheat prevention temperature controller and temperature control method.

The present invention uses the PTC positive characteristics of the NTC thermistor and the heating wire, primarily to detect overheating in the NTC thermistor, and secondly to detect overheating in the heating wire, so that overheating of the heating wire can be detected more quickly and sensitively. Has the effect.

The present invention generates a synchronization signal of the first and second in the temperature controller without a separate temperature sensor, by first checking whether the overheat according to the temperature detection voltage in the heating wire with this synchronization signal, the flow of the heating current according to the state It has the effect of being able to control.

According to the present invention, the AC half wave is used for temperature detection, the half wave is used for heating, and at the same time, the temperature can be detected through a DC current applied at a predetermined interval, and the temperature signal voltage is applied at a time when there is no mutual interference. It has the effect of detecting overheating and controlling the temperature.

Claims (20)

It is connected to the heating wires including the first and second heating wires arranged in parallel with each other and the current input to one heating wire is connected to the other heating wire to be output, and the NTC thermistor wound therebetween, The second heating wire is made of a positive characteristic material that increases the internal electrical resistance at elevated temperature, The first synchronization signal detects whether the first heating wire and the second heating wire are overheated, disconnected, short-circuited or shorted, and detects the temperature primarily through the detection signal state, and the second heating wire itself is overheated. And a control unit which detects whether or not by a second synchronous signal and detects a second temperature through the detection signal state, and outputs a heating signal if there is no abnormality in the first temperature detection and the second temperature detection. The current flowing through any one of the heating wires of the first and second heating wires flows out again through the other heating wires so that the current directions flowing through the first and second heating wires are reversed to each other so that the magnetic fields due to the currents cancel each other out and thus no magnetic field Synchronization signal detection electromagnetic shielding temperature controller, characterized in that to form a. The method of claim 1, A first temperature signal voltage supply unit connected to a power supply side of the heating wire to supply a first signal voltage; A first temperature signal voltage detection unit connected to the other side of the heating wire between the first heating wire and the second heating wire to detect whether a first signal voltage supplied from the first temperature signal voltage supply unit is received; A second temperature signal voltage supply unit for supplying a second signal voltage to one end of the second heating wire; And A second temperature signal voltage connected in parallel to the connection portion of the second temperature signal voltage supply unit, one end of the second heating wire, and the other end of the second heating wire to detect the second signal voltage supplied from the second temperature signal voltage supply unit; It is configured to include a detection unit, The controller is configured to supply a heating current when a voltage above a predetermined level is detected by the first temperature signal voltage detector and a voltage applied to both ends of the second heating wire by the second temperature signal voltage detector is below a predetermined level. Characterized in the synchronization signal detection electromagnetic shielding temperature controller. The method of claim 2, And the control unit does not supply a heating current when the signal voltage is detected by the first temperature signal voltage detection unit below a predetermined voltage. The method of claim 2, The first signal voltage supplied from the first temperature signal voltage supply unit is: Is input to any one of the first, second heating wire, When the NTC thermistor is less than a predetermined temperature is detected by the first temperature signal voltage detector and turned U, If the NTC thermistor exceeds a predetermined temperature, all or part of the NTC thermistor U-turn, characterized in that the electromagnetic wave blocking temperature controller. The method of claim 2, And the first signal voltage is periodically applied by an input half-wave of an AC power supply from the first temperature signal voltage supply unit. It is connected to the heating wires including the first and second heating wires arranged in parallel with each other and the current input to one heating wire is connected to the other heating wire to be output, and the NTC thermistor wound therebetween, The second heating wire is made of a positive characteristic material that increases the internal electrical resistance at elevated temperature, And a controller for detecting whether the second heating wire itself is overheated by a second synchronous signal, detecting a temperature through the detection signal state, and outputting a heating signal if the second temperature detection is intact. The current flowing through any one of the heating wires of the first and second heating wires flows out again through the other heating wires so that the current directions flowing through the first and second heating wires are reversed to each other so that the magnetic fields due to the currents cancel each other out and thus no magnetic field Synchronization signal detection electromagnetic shielding temperature controller, characterized in that to form a. The method of claim 6, A second temperature signal voltage supply unit for supplying a second signal voltage to one end of the second heating wire; And A second temperature signal voltage connected in parallel to the connection portion of the second temperature signal voltage supply unit, one end of the second heating wire, and the other end of the second heating wire to detect the second signal voltage supplied from the second temperature signal voltage supply unit; It is configured to include a detection unit, And the control unit supplies a heating current when the voltage applied to both ends of the second heating wire is detected by the second temperature signal voltage detection unit at a predetermined level or less. The method according to claim 2 or 7, And the control unit does not supply a heating current when the voltage applied to both ends of the second heating wire in the second temperature signal voltage detection unit exceeds a predetermined level. The method according to claim 2 or 7, The second temperature signal voltage detection unit: And a second signal voltage supplied from the second temperature signal voltage supply unit detects a value applied to both ends of the second heating wire and sends the detected value to the controller. The method of claim 9, The second temperature signal voltage detection unit: When the temperature signal voltage at both ends of the second heating wire is low, amplification of the signal by direct proportional to the control signal electromagnetic shielding temperature controller characterized in that it sends to the controller. The method according to claim 2 or 7, And the second signal voltage is periodically applied by a separate input power from the second temperature signal voltage supply unit. The method of claim 11, And the second signal voltage is applied at a zero phase time point of an alternating current applied to a heating line from a power supply. The method of claim 2 or 7, wherein the second temperature signal voltage detection unit: An amplifying element for amplifying the detected second temperature signal; And And a setting volume for setting a reference voltage for comparison with the amplified second temperature signal. The method of claim 2 or 7, wherein the second temperature signal voltage detection unit: Equipped with a rectifying element for controlling the reverse voltage, And a heating voltage applied to the first and second heating wires protects the second temperature signal voltage supply unit and the second temperature signal voltage detection unit. Arranged in parallel with each other and the current input to one heating wire is connected to the heating wire including the first and second heating wires connected so that the U-turn is output to the other heating wire and the NTC thermistor wound therebetween, and the second heating wire is the internal electricity at the temperature In the method for blocking the heating when the heating wire of the PTC positive characteristic with increasing resistance is heated to a high temperature above a certain level, A first signal voltage generation step of generating, by the first temperature signal voltage supply unit, a first signal voltage at every half cycle voltage of the temperature detection unit in a half cycle section for temperature detection during an AC power cycle; A first signal voltage detection step of detecting a first signal voltage output from the first temperature signal voltage supply part through a heating wire of one of the first and second heating wires and detected by a first temperature signal voltage detection part connected to the other end of the heating wire; ; A synchronization signal generation step of generating a synchronization signal for detecting the second temperature signal voltage by a program of the controller; A second signal voltage generating step of generating, by the second temperature signal voltage detection synchronization signal, a second signal voltage at a predetermined interval from the second temperature signal voltage supply unit to the second heating wire; A second signal voltage detection unit configured to detect a voltage across the second heating wire in a second temperature signal voltage detection unit connecting the second temperature signal voltage supplying unit, the connection of one end of the second heating wire and the other end of the second heating wire in parallel; step; And The heating current is applied to the heating line only when a voltage of a predetermined level or more is detected in the first signal voltage detection step and a voltage of a predetermined level or less is detected in the second signal voltage detection step. And a heating control step of not supplying a heating current when a voltage is detected below a predetermined level in the first signal voltage detection step or when a voltage is detected above a predetermined level in the second signal voltage detection step. Temperature control method of the electromagnetic wave blocking temperature controller by detecting a synchronization signal. The method of claim 15, When a voltage is detected below a predetermined level in the first signal voltage detection step or when a voltage is detected above a predetermined level in the second signal voltage detection step, When the voltage is detected above the predetermined level in the first signal voltage detection step, and when the voltage is detected below the predetermined level in the second signal voltage detection step, the heating current is supplied again. Temperature control method of cut-off thermostat. Arranged in parallel with each other and the current input to one heating wire is connected to the heating wire including the first and second heating wires connected so that the U-turn is output to the other heating wire and the NTC thermistor wound therebetween, and the second heating wire is the internal electricity at the temperature In the method for blocking the heating when the heating wire of the PTC positive characteristic with increasing resistance is heated to a high temperature above a certain level, A synchronization signal generation step of generating a synchronization signal for detecting the second temperature signal voltage by a program of the controller; A second signal voltage generating step of generating, by the second temperature signal voltage detection synchronization signal, a second signal voltage at a predetermined interval from the second temperature signal voltage supply unit to the second heating wire; A second signal voltage detection unit configured to detect a voltage across the second heating wire in a second temperature signal voltage detection unit connecting the second temperature signal voltage supplying unit, the connection of one end of the second heating wire and the other end of the second heating wire in parallel; step; And The heating current is applied to the heating line only when a voltage below a predetermined level is detected in the second signal voltage detection step, and the heating current is not supplied when the voltage is detected above a predetermined level in the second signal voltage detection step. Method of controlling the temperature of the electromagnetic wave blocking temperature controller by the synchronization signal detection, characterized in that it comprises a heating control step. The method of claim 17, When the voltage is detected in excess of a predetermined level in the second signal voltage detection step, And a heating current is supplied again when the voltage is detected below the predetermined level in the second signal voltage detection step. The method according to claim 15 or 17, The second signal voltage is periodically applied by a separate input power from the second temperature signal voltage supply unit temperature control method of the electromagnetic wave blocking temperature controller by detecting the synchronization signal. The method according to claim 15 or 17, And the second signal voltage is applied at a zero phase timing of an alternating current applied to a heating line from a power supply.

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