KR100886377B1 - Temperature controller for offsetting electron wave of heating-wire - Google Patents

Abstract

A temperature controller for offsetting electron wave of heating-wire is provided to prevent EMI(Electromagnetic Interference) by performing zero point trigger precisely. In a temperature controller for offsetting electron wave of heating-wire, a DC power generator(10) supplies the predetermined DC power to each unit of a circuit. A temperature sensing and hot-wire operating part(20) operate a hotwire with an ON / OFF operation of a switching element. Temperature setting unit(30) provides a temperature setting voltage to a comparison unit(50). The amplifier unit(40) includes a resistor (R6), a variable resistor (VR2) and an amplifier (COM1). The comparator (COM2) of the comparison unit compares the temperature setting voltage of temperature with output voltage of amplifier. The delay unit(60) includes a resistor and a capacitor (C4). The delay unit controls a trigger current of the switching element according to a time constant. If input voltage of an non-inverting terminal is lower than that of inverting terminal, heating wire detection unit(90) outputs a heating wire short signal to the delay unit through a diode(D8).

Description

TEMPERATURE CONTROLLER FOR OFFSETTING ELECTRON WAVE OF HEATING-WIRE}

The present invention relates to a temperature controller for controlling a temperature by canceling a magnetic field by connecting a heating line (primary winding) and a sensing line (secondary winding) in series. More particularly, the driving of the heating line and the sensing line is controlled by SCR (silicon control). Rectifier) Half-wave driving using a switching element, and when the non-conductive half-wave driving of the switching element detects the voltage of both ends of the heating wire (detection wire) to perform temperature control as well as to detect the short circuit of the heating wire to perform a safety function, The present invention relates to a temperature control device for reducing electromagnetic waves of a heating wire that performs the zero point trigger of the switching element very precisely, thereby eliminating generation of electromagnetic waves (electromagnetic fields) and enabling accurate and safe temperature control.

Conventional non-magnetic field (structure to cancel the magnetic field generation), as shown in Figure 1, the first heating wire (H1) is wound in one direction on the primary insulating member K1, the secondary insulating member thereon Extrude and insulate (K2) to a predetermined thickness, and then wound the second heating wire (H2) in the opposite direction to the first heating wire (H1), and again press the tertiary insulating member (K3) to a predetermined thickness thereon After discharging and insulating, the third heating wire S1 is wound thereon in a direction opposite to the second heating wire H2.

The final insulating member W is extruded to a predetermined thickness and insulated from the third heating wire S1.

In the non-magnetic heating wire, the first heating wire H1 and the second heating wire H2 connect one end of each other (J), and apply power between the other first heating wire H1 and the second heating wire H2. It is a structure that generates heat.

Therefore, in the case of the non-magnetic heating wire, the currents flowing through the winding N1 made of the first heating wire H1 and the winding N2 made of the second heating wire H2 are the same and opposite in direction, and thus the magnetic field is generated. By canceling each other using the principle that the magnetic field generation is minimized.

However, such a conventional non-magnetic heating wire was used to sense the temperature of the heating wire by using the third heating wire (S1) as a function of the temperature sensor, and performed the temperature control of the heating wire using the detected temperature,

The problem that the manufacturing cost of a magnetic field heating wire rose and the manufacturing process also became complicated was derived.

In addition, it is difficult to accurately control the temperature of the non-magnetic heating wire has been a problem that the electromagnetic wave (EMI) is not completely removed.

The present invention has been made under the above-mentioned background, an object of the present invention is to connect the heating wire (primary winding) and the sensing line (secondary winding) in series to offset the magnetic field to control the temperature as well as lower the manufacturing cost of the product It is to provide a temperature control device for reducing the electromagnetic wave of the heating wire to simplify the manufacturing process.

Another object of the present invention is to drive the heating line and the sensing line half-wave by using a SCR (silicon controlled rectifier) switching element, and when the non-conductive half-wave driving of the switching element detects the voltage at both ends of the heating line (sensing line) In addition to detecting the short-circuit of the heating wire, the safety function is also performed, but the zero point trigger of the switching element is performed very precisely, eliminating the generation of electromagnetic waves (EMI) and at the same time enabling accurate and safe temperature control of the heating wire. The present invention provides a temperature control device for reducing electromagnetic waves.

The present invention for achieving the above object is composed of a resistor and a capacitor to limit the AC current connected to the power supply terminal, a rectifying diode, a constant voltage zener diode to generate a predetermined DC power supply to supply to each circuit portion Wealth; A temperature sensing and hot wire driving unit including a resistor for driving a heating wire by an on and off operation of a switching element interposed in a power supply terminal and providing a cathode current output of the switching element to a temperature setting unit; A temperature setting unit for dividing a DC power supply through a diode and a variable resistor to set a temperature setting voltage to provide a comparison unit; An amplifying unit comprising a resistor for detecting a voltage applied to the hot wire winding of the temperature sensing unit and the hot wire driving unit, a variable resistor for adjusting an amplification rate, and an amplifier for amplifying and outputting a hot wire temperature sensing voltage input through the resistor at a set amplification rate; A comparator comprising a comparator configured to compare the temperature set voltage of the temperature set part and the output voltage of the amplifier part and output the comparator; A delay unit configured to include a resistor connected to an output terminal of the comparator and a capacitor connected in parallel to the resistor to configure a time constant circuit, the trigger current of the switching element being controlled according to a set time constant value; A half-wave detector configured to connect an output terminal of the delay unit to a collector of a transistor having an emitter terminal grounded, and to supply power to a base of the transistor through a forward bias resistor, to provide a synchronization signal of a trigger signal of a switching element; A comparator for comparing the output voltage of the delay unit and the half-wave detection unit with a reference input voltage set by a resistor and a resistor, and a diode connected to the output terminal of the comparator and the reference voltage input terminal to give a positive feedback signal; An output latch unit for applying a trigger signal to a switching device by an output of the comparator; And a comparator in which the voltage detected through the secondary winding resistance of the hot wire driving and temperature sensing unit is input to the non-inverting terminal through the resistor, and the reference voltage set when the hot wire is shorted or overheated through the resistor is input to the inverting terminal. When the voltage input to the non-inverting terminal is lower than the reference voltage set in the inverting terminal has a feature that includes a hot wire overheat detection unit for outputting a hot wire short signal to the delay unit through a diode.

As described above, the present invention is composed of a so-called magnetic field-free heating wire that the magnetic field is offset, but removes the temperature sensing line, which is conventionally mounted separately, provides the advantage of lowering the manufacturing cost of the product and simplifying the manufacturing process.

In addition, the present invention is a half-wave driving by using the SCR (silicon controlled rectifier) switching device, and during the non-energized half-wave driving of the switching device detects the voltage across the secondary winding of the heating wire to perform the temperature control as well as the heating wire The safety function is also performed by detecting a short circuit, but the zero point trigger of the switching element is performed very precisely, eliminating the generation of electromagnetic waves (EMI), and at the same time, it has the advantage of accurate and safe temperature control.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a heating line structure of a temperature control apparatus for reducing electromagnetic waves according to the present invention.

As shown, the configuration of the present invention heating wire winding the first heating wire (H1) in one direction on the primary insulating member (K1), and insulated by extruding the secondary insulating member (K2) to a predetermined thickness thereon The second heating wire H2 is wound thereon in a direction opposite to the first heating wire H1, and the final insulating member W is extruded to a predetermined thickness to insulate the second heating wire H2. .

In addition, the first heating wire H1 and the second heating wire H2 are connected to each other at one end (J), and generate heat by applying power between the other first heating wire H1 and the second heating wire H2. It is.

First, in the case of the heating wire of the present invention, the third heating wire S1 for temperature sensing is not constituted as in the conventional heating wire (see FIG. 1).

Therefore, in the present invention, in order to detect the temperature of the heating wire to detect the heating wire temperature between the connection terminal (J) of the first heating wire (H1) and the second heating wire (H2) and the power supply side second heating wire (H2). This is possible by detecting the temperature (resistance value) of the heating wire at a time when power is not applied to the heating wire described later.

3 is a circuit diagram of a temperature control apparatus for reducing electromagnetic waves of a heating line according to the present invention.

As shown, the temperature control device for reducing electromagnetic waves of the heating line of the present invention,

Resistor R1 and capacitor C1 connected to the power supply terminals AC1 and AC2 to limit AC current, rectifying diodes D1 and D2, and constant voltage zener diode ZD1, thus providing a predetermined DC power supply (VCC). DC power generator 10 for generating and supplying the circuit to each circuit,

A resistor (R3) for driving the heating wire by the on / off operation of the switching element (SCR) interposed in the power supply terminal and providing the cathode current output of the switching element (SCR) to the temperature setting unit (30). Temperature sensing and hot wire driving unit 20,

A temperature setting unit 30 for dividing a DC power supply through a diode D3, a resistor R4, a variable resistor VR1, and a resistor R5 to set a temperature setting voltage to provide the comparison unit 50;

The resistor R6 detects a voltage applied to the winding N2, which is the second heating wire H2 of the temperature sensing and heating wire driver 20, a variable resistor VR2 for adjusting the amplification rate, and the resistor R6. An amplifying unit 40 comprising an amplifier COM1 for amplifying the input hot wire temperature sensing voltage at a set amplification factor and outputting the same;

A comparator 50 comprising a comparator COM2 for comparing and outputting the temperature set voltage of the temperature setter 30 and the output voltage of the amplifier 40;

The resistor R6 is connected to the output terminal of the comparator COM2 and the capacitor C4 is connected in parallel to the resistor R6 to form a time constant circuit. A delay unit 60 for controlling the trigger current of

The output terminal of the delay unit 60 is connected to the collector of the transistor Q1 with the emitter terminal grounded, and the power is applied to the base of the transistor Q1 through the forward bias resistor R7, so that the switching element A half wave detection unit 70 for providing a synchronization signal of a trigger signal of

Comparator COM3 for comparing the output voltages of the delay unit 60 and the half-wave detection unit 70 with the reference input voltage set by the resistors R9 and R8 and outputting the comparator COM3 and an output terminal of the comparator COM3. And an output latch unit 80 connected to the reference voltage input terminal and configured to apply a positive feedback signal, and apply a trigger signal to the switching element SCR by the output of the comparator COM3;

The voltage detected through the resistance of the secondary winding N2 of the hot wire driving and temperature sensing unit 20 is input to the non-inverting terminal through the resistor R12, and overheated through the resistor R10 and the resistor R11. The reference voltage set when the short circuit caused by the short circuit includes a comparator (COM4) is input to the inverting terminal, if the voltage input to the non-inverting terminal is lower than the reference voltage set in the inverting terminal, the heating wire overheat and short-circuit signal diode (D8) The heat wire overheat detection unit 90 outputs to the delay unit 60 through.

Here, the capacitor C5 is for noise removal of an AC input, and the TNR is a large surge current absorbing element.

In addition, unexplained symbol, LED is a light emitting diode for power display, SW is a power switch.

In addition, the transistor Q2 is connected to the output terminal of the output latch unit 80 to provide a trigger current to the switching element SCR through the diode D7.

It looks at the specific operation of the present invention configured as described above.

First, when power is applied, the applied power generates the DC power supply VCC through the DC power generation unit 10, and at the same time, the first heating wire of the hot wire driving and temperature sensing unit 20 through the switching element SCR. H1) and the windings N1 and N2 of the second heating wire H2 are applied to perform the heating operation.

In this state, in the non-energizing period (half-wave period in which the power supply is negative (-)) of the switching element SCR, the current flows from the direct current power source (VCC) → diode (D3) → resistance (R3) → winding (N1) → winding It flows from (N2) to ground (GND). Accordingly, a sensor voltage proportional to the temperature is generated at both ends of the winding N2 with a polarity of (+) at S2 and (-) at S1, and this voltage is transmitted through the resistor R6 to the amplifier COM1 of the amplifier 40. Is input to the non-inverting terminal (+).

The variable resistor VR1 is connected to the inverting terminal (-) of the amplifier COM1 as a means for correcting a heating wire having a difference in the offset deviation of the amplifier itself and the electrical resistance of the winding N2 by adding or subtracting the amplification factor of the amplifier COM1. do.

The temperature sensing sensor voltage amplified and output through the amplifier COM1 is input to the inverting terminal − of the comparator COM2 of the comparator 50.

Meanwhile, in the non-energizing period of the switching element SCR, a DC power supply VCC is applied to the resistor R4, the variable resistor VR1, and the resistor R5 via the diode D3 of the temperature setting unit 30. The divided voltage which is divided and variably adjusted by the variable resistor VR1 (temperature setting value) is input to the non-inverting terminal (+) of the comparator COM2 of the comparator 50.

Accordingly, when the current sensor temperature detection voltage input through the amplifier 40 is lower than the temperature setting voltage set through the variable resistor VR1 through the comparator COM2, the output of the comparator COM2 is set to a high level. The capacitor C4 is charged through the resistor R6 of the delay unit 60 to gradually increase its voltage, and this voltage is applied to the inverting terminal (-) of the comparator COM3 of the output latch unit 80. .

Here, the voltage applied to the inverting terminal (-) of the comparator COM3 gradually increases, so that the divided reference voltage already set by the resistor R9 and the resistor R10 is applied to the non-inverting terminal + of the comparator COM3. When the time exceeds VCC / 2), the output of the comparator COM3 is switched to the low level state and applied to the base of the transistor Q2, and the transistor Q2 is turned on to switch the switching element SCR through the diode D7. The switching element (SCR) is conducted by supplying a trigger signal to a gate.

According to the present invention, the trigger current applied to the switching element (SCR) is dependent on the charge and discharge time constant consisting of the resistor (R6) and the capacitor (C4) of the delay unit 60 and the electromagnetic wave (EMI) It is set just before the conduction period (half wave period in which the AC power supply is positive) of the switching element SCR so as not to be generated.

However, the trigger current of the switching element (SCR) is a relatively large current (tens of mA) and overlaps the path between the windings N1-N2 of the hot wire driving and the temperature sensing unit 20 so that the sensor voltage across the winding N2 is greatly increased. The output voltage of the amplifier 40 is increased to a large width VCC and is input to the inverting terminal (-) of the comparator COM2 of the comparator 50 so that the output of the comparator COM2 is at a low level. Is reversed.

The voltage charged in the capacitor C4 of the delay unit 60 by the low level output of the comparator COM2 is discharged and lowered through the resistor R6, and the voltage is lowered by the comparator COM3 of the output latch unit 80. Negative feedback is inputted to the inverting terminal (-) of the N) to change the output of the comparator COM3 back to a high level so that a sufficient trigger current may not be applied to the switching element SCR.

However, the low level output of the comparator COM3 of the output latch unit 80 conducts the diode D6 to lower the input reference voltage applied to the non-inverting terminal + of the comparator COM3, that is, the diode D6. Forward voltage + comparator (COM3) of the low level output holding voltage = approximately 1.2V by applying a positive feedback, the output current of the amplifier 40 increases significantly due to the trigger current of the switching element (SCR) As a result, the output of the comparator 50 is inverted to a low level, and the charging voltage VCC / 2 of the capacitor C4 starts to discharge through the resistor R6, so that the ratio of the comparator COM3 of the output latch 80 is reduced. A sufficient trigger time and current are secured by limiting the output of the output latch unit 80 to a low level for a time (a few ms) to reach the input voltage (about 1.2 V) of the inverting terminal (+).

On the other hand, when the current flows through the heating wire due to the conduction of the switching element (SCR), the temperature rises and the output voltage of the amplifier 40 increases with the increase in the electrical resistance of the winding N2. Here, when the output voltage of the amplifier 40 rises above the temperature set voltage set at the non-inverting terminal (+) of the comparator COM2 of the comparator 50, the output of the comparator COM2 is inverted to a low level.

When the comparator COM2 outputs a low level, since the capacitor C4 of the delay unit 60 is not charged, the voltage thereof becomes low, and eventually, the inverting terminal (-) of the comparator COM3 of the output latch unit 80. A low level is applied to the comparator COM3 to output a high level signal.

The transistor Q2 is turned off by the high level signal output of the comparator COM3 and the switching device SCR is turned off because no trigger signal is applied to the gate of the switching device SCR. Therefore, the driving of the hot wire is stopped, and the temperature control is performed in proportion to the temperature set by the temperature setting unit 30 through such control.

In such temperature control,

The half-wave detection unit 70 turns on the transistor Q1 with the forward bias current of the resistor R7 near the positive voltage rise, which is the beginning of the conduction period of the switching element SCR (half-wave period in which the alternating current is positive). On, the capacitor C4 of the delay unit 60 is rapidly discharged so that the inverting terminal (-) input voltage of the comparator COM3 of the output latch unit 80 is replaced with the non-inverting terminal (-) input voltage (about 1.2 V). Set it as follows. Accordingly, the output of the comparator COM3 of the output latch unit 80 is inverted to a high level so that the trigger current is not applied to the switching element SCR, thereby saving the trigger current and simultaneously biasing the transistor Q1. The charging of the capacitor C4 of the delay unit 60 is started at the starting point between the non-conducting parts of the switching element SCR which is turned off, and after the time constant of the capacitor C4 and the resistor R6 has elapsed, the output latch unit 80 It is used for the purpose of synchronizing the output of the low level to trigger immediately before the conduction period of the switching element (SCR).

In addition, the capacitor C3 of the temperature setting unit 30 has a high positive voltage of the power supply voltage from the cathode when the switching element SCR is connected to the capacitor C3 through the resistor R3 and the resistor R4 through the diode D4. In the non-conducting period of the switching element (SCR) in which the temperature comparison operation is performed, the battery is discharged gradually and interferes with the temperature set voltage (+) to increase the temperature set voltage and the temperature rises so that the temperature sensing voltage becomes the temperature set voltage. When the switching element SCR is turned off in excess of the capacitor C3, the feedback voltage from the cathode of the switching element SCR is lost from the cathode of the switching element SCR, so that the temperature setting voltage is lowered. Enables sorting operation.

In addition, the DC power supply VCC is divided into the resistor R3 and the winding resistance N1 + N2 through the diode D3 at the non-inverting terminal (+) of the comparator COM4 of the hot wire overheat detection unit 90. Due to overheating, the secondary insulation member K1 melts at any part, and the winding N1 and the winding N2 are short-circuited, or a heating wire having a significantly lower resistance than the standard is connected to the first heating wire H1 and the second heating wire. When the voltage between (H2) is lowered by 30% or more, this voltage is input to the non-inverting terminal (+) of the comparator COM4 of the hot wire overheat detection unit 90 through the resistor R12 and the inverting terminal of the comparator COM4. Since the voltage between the first heating wire H1 and the second heating wire H2 is 30% lower than normal, a negative voltage is supplied to the negative voltage by the VCC, the resistor R10, and the resistor R11. The output of the comparator COM4 of 90 is inverted to a low level to discharge the capacitor C4 through the diode D8.

Therefore, a low level is applied to the inverting terminal (-) of the comparator COM3 of the output latch unit 80 so that the comparator COM3 outputs a high level signal to turn off the transistor Q2 and operate the switching element SCR. It prevents abnormal heating and overheating of the heating wire due to overcurrent.

1 is a configuration diagram of a conventional magnetic field-free heating wire,

2 is a configuration diagram of a heating wire according to the present invention;

3 is a circuit diagram of a temperature control apparatus for reducing electromagnetic waves of a heating line according to the present invention.

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

10: DC power generation unit 20: hot wire driving and temperature detection unit

30: temperature setting unit 40: amplifying unit

50: comparison unit 60: delay unit

70: half wave detection unit 80: output latch unit

90: hot wire overheat detection unit

Claims (2)

delete Resistor R1 and capacitor C1 connected to the power supply terminals AC1 and AC2 to limit AC current, rectifying diodes D1 and D2, and constant voltage zener diode ZD1, thus providing a predetermined DC power supply (VCC). DC power generation unit 10 for generating and supplying to each circuit; A resistor (R3) for driving the heating wire by the on / off operation of the switching element (SCR) interposed in the power supply terminal and providing the cathode current output of the switching element (SCR) to the temperature setting unit (30). Temperature sensing and hot wire driving unit 20; A temperature setting unit 30 for dividing the DC power through the diode D3, the resistor R4, the variable resistor VR1, and the resistor R5 to set the temperature set voltage and provide the temperature set voltage to the comparison unit 50; A resistor R6 for detecting a voltage applied to the heating wire winding N2 of the temperature sensing and heating wire driving unit 20, a variable resistor VR2 for adjusting an amplification factor, and a heating wire temperature sensing voltage input through the resistor R6. An amplifier 40 comprising an amplifier COM1 for amplifying and outputting the amplifier at a set amplification factor; A comparator (50) comprising a comparator (COM2) for comparing and outputting the temperature set voltage of the temperature setter (30) and the output voltage of the amplifier (40); A resistor R6 connected to the output terminal of the comparator COM2 and a capacitor C4 connected in parallel to the resistor R6 to form a time constant circuit, and according to a set time constant value, A delay unit 60 for controlling the trigger current of the SCR; The output terminal of the delay unit 60 is connected to the collector of the transistor Q1 with the emitter terminal grounded, and the power is applied to the base of the transistor Q1 through the forward bias resistor R7, so that the switching element A half-wave detection unit 70 for providing a synchronization signal of a trigger signal of the; Comparator COM3 for comparing the output voltages of the delay unit 60 and the half-wave detection unit 70 with the reference input voltage set by the resistors R9 and R8 and outputting the comparator COM3 and an output terminal of the comparator COM3. And an output latch unit 80 connected to the reference voltage input terminal and configured to apply a positive feedback signal, and apply a trigger signal to the switching element SCR by the output of the comparator COM3; And The temperature voltage detected through the resistance of the secondary winding N2 of the hot wire driving and temperature sensing unit 20 is input to the non-inverting terminal through the resistor R12 and through the resistor R10 and the resistor R11. And a comparator (COM4) in which the reference voltage set when the hot wire is shorted is input to the inverting terminal. When the voltage input to the non-inverting terminal is lower than the reference voltage set in the inverting terminal, the hot wire short signal is transmitted through the diode (D8). Temperature control device for reducing the electromagnetic wave of the heating line, characterized in that it comprises a heating wire overheat detection unit 90 output to the delay unit (60).

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