KR910004584Y1 - Automatic voltage control heater - Google Patents

Abstract

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Description

100V / 220V combined thermostat

1 is a block diagram showing the basic configuration of the present invention.

2 is a detailed circuit diagram according to one embodiment of the present invention.

3A is a perspective view showing the structure of a heat generating unit.

3b is a graph showing the resistance-temperature characteristics of the heat-sensitive layer.

4A and 4B are explanatory diagrams showing the relationship between the sensor voltage V _S , the reference voltage V _R , and the trigger point P _L (P _H ).

* Explanation of symbols for main parts of the drawings

1: heat generating unit 2: temperature and voltage detection circuit

3: comparison and trigger pulse generation circuit 4: voltage variable circuit

5: reference voltage generating circuit 6: output circuit

7, 8: safety circuit 9: lamp

11 heater 12 sensing wire 1

3: thermal layer V _S : sensor voltage

V _R : reference voltage SF, TF: fuse

SCR: Silicon Controlled Rectifier

The present invention relates to a thermostat device for both 100V and 220V, and more particularly, to a thermostat device configured to always consume a constant power even if any power supply voltage is input in an electric blanket or an electric yoke.

As is known, two types of voltages, 100V and 220V, are currently used as household voltages. Therefore, in order to use a certain electric appliance for both of these two types of voltages, a method in which a power supply voltage switching switch is used beforehand and set to a predetermined voltage before use of the electric appliance is often used. However, in this case, it is not only inconvenient to set the changeover switch manually by human hands, but also, if the changeover switch is misaligned so that excessive or excessive voltage is supplied, the parts may not be damaged or the giga will not operate. There was a problem.

In addition, although electric appliances (particularly televisions) which are intended to be used both at 100V and 220V by using a relay without using such a switching switch are also known, the relay driving circuit is complicated in this kind of apparatus. Not only could not be miniaturized, but the manufacturing cost was expensive.

The present invention is to solve the conventional problems as described above, the main purpose of the present invention is to adopt a half-wave phase controlled AC constant voltage circuit to minimize the change in power consumption to the change in power supply voltage to the voltage change between 90V to 240V The company aims to provide a thermostat that always delivers constant power to the load without the need for a separate voltage change switch or relay.

It is another object of the present invention to provide a thermostat for use in an electric blanket, or an electric yoke, which provides a constant temperature by using only a constant power without any user manipulation even if any power supply voltage between 90V and 240V is applied. I will.

Another object of the present invention is to provide a thermostat of the type described above, which is simple in structure and inexpensive to manufacture.

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

1 is a block diagram showing the basic configuration of the present invention, as shown in the circuit configuration of the present invention is largely composed of a heater that is a heating element and a temperature control unit for controlling the temperature of the heater, specifically, the heating unit (1), the voltage detection circuit (2), the comparison and trigger pulse generation circuit (3), the voltage variable circuit (4), the constant voltage (reference voltage) generation circuit (5), the output circuit (6) It can be divided into safety circuits 7 and 8.

As will be described in detail later, the heat generating unit 1 includes a heater for providing heat required by an electric blanket or an electric yoke, and the temperature and voltage detection circuit 2 is connected to the heat sensitive wire which is also located in the heat generating unit 1. In addition to detecting the temperature, the sensor voltage due to the change in the power supply voltage is also detected. That is, the temperature and voltage detection circuit 2 detects the temperature and the voltage in combination. On the other hand, the reference voltage generating circuit 5 always generates a constant reference voltage and transmits it to the comparison and trigger pulse generating circuit 3. It is preferable to use one or more zener diodes in such a reference voltage generator circuit 5, which is known in the art regarding the characteristics of the zener diodes. The comparison and trigger pulse generation circuit 3 accepts and compares both the sensor voltage and the reference voltage described above, and generates a trigger pulse to trigger the output circuit 6 when the sensor voltage is lower than the reference voltage. The output circuit 6 preferably includes an SCR.

FIG. 2 is a circuit diagram according to an embodiment of the present invention, shown in block diagram in FIG. 1, in which FIG. 2 specifically shows electrical elements for realizing each block of FIG.

Hereinafter, the components of the present invention will be described in detail, and the heating unit 1 may include the primary winding (ie, heater) 11 and the secondary winding (ie, sensing line) as shown in FIG. 3A. It consists of 12 and the heat-sensitive layer 13.

The heat-sensitive layer 13 is usually made of a nylon thermistor. When the temperature increases, the resistance Rz decreases as the temperature increases, and when the temperature decreases, the resistance Rz increases and has a negative temperature coefficient characteristic (see FIG. 3B). Reference numeral 14 denotes an outer shell.

Therefore, when the temperature rises and the resistance of the heat sensitive layer 13 decreases, the amount of current flowing from the heater 11 to the sensing line 12 becomes large, and such a state is detected by the temperature and voltage detection circuit 2. do. That is, as the amount of current increases, the voltage V _S (see FIG. 2) across R ₂ + VR ₂ in the temperature and voltage detection circuit 2 increases.

The comparison and trigger pulse generation circuit 3 compares the sensor voltage V _S caused by the detected power supply voltage change with the predetermined reference voltage V _R (see FIG. 2) from the constant voltage generation circuit 5. To generate the trigger pulse. At this time, if V _S > V _R , the trigger pulse does not appear. That is, the trigger pulse is generated only when V _S < V _R. This relationship is illustrated in FIG claim 4a also and the 4b, when the sensor voltage (V _S) according to claim 4a power supply voltage change to turn relatively low, and the sensor voltage due to the 4b power supply voltage change to turn (V _S) The cases where are relatively high are shown, respectively. In FIGS. 4A and 4B, the half-wave sine wave represents the sensor voltage V _S and the square wave represents the reference voltage V _R , respectively. As is apparent from FIGS. 4A and 4B, the trigger point P _B when the sensor voltage V _S is low becomes faster than the trigger point P _G when the sensor voltage V _S is high. In other words, as described above, the amount of current temperature is raised to the inlet to the sense line 12 increases, accordingly when the sensor voltage (V _S) increases, the point the firing of the comparator circuit as in claim 4b FIG. Since the amount of electric power (area of the hatched portion in FIG. 4B) that is delayed is reduced, the rise in temperature can be prevented. On the contrary, when the temperature is lowered, the resistance of the heat-sensitive layer is increased, thereby lowering the sensor voltage (V _S ), and thus, the trigger point is fastened, the power consumption (hatched portion of FIG. 4a) is increased, and the temperature is raised, thereby always constant voltage. Can be maintained. The comparison and trigger pulse generation circuit 3 includes resistors R ₄ , R ₅ , R ₆ , capacitors C ₂ , C ₃ , transistors TR ₁ , and TR ₂ . And diode D ₁ can be connected to each other as shown in FIG.

The comparison and trigger pulse generation circuit 3 configured as described above compares the sensor voltage V _S with the selected reference voltage V _R as described above, and issues a trigger pulse when V _S &lt; V _R. The process is as follows. That is, V plane _S rodoe <V _R, the current is (R ₇₎ → hayeoseo flow to the path of (the emitter of TR ₁₎ → (base of TR ₁₎ and the transistor (TR ₁₎ is turned on (ON), also (R ₇₎ → too (the emitter of TR ₁₎ → (collector of TR ₁₎ → (base of TR ₂₎ → a is the amplified current to the path of (the emitter of TR ₂₎ flows through the transistor (TR ₂₎ ON. When the transistor TR ₂ is turned on, the current charged in the capacitor C ₃ is rapidly discharged in the path from C _{3 to} TR _{1 to} TR _{2 to} R ₆ and SCR. This triggers the SCR.

In addition, the voltage variable circuit 4 includes a variable resistor VR ₁ and a resistor R ₈ connected in series, and the constant voltage (reference voltage) generation circuit 5 includes a diode D ₄ and a resistor R ₉ . And control diodes ZD ₁ and ZD ₂ are connected in series. As described above, the constant voltage generation circuit 5 supplies a constant voltage to the variable circuit 4 by a known characteristic of the Zener diodes ZD ₁ and ZD ₂ even when the power supply voltage changes, thereby providing a constant trigger. It is a circuit for maintaining points. The voltage variable circuit 4 adjusts power and temperature by varying the reference voltage V _R using the variable resistor VR ₁ to move the trigger point.

In addition, the output circuit 6 is a circuit that finally energizes the heater, and performs the function of a half-wave relay in the SCR.

On the other hand, power control and temperature control are not performed when certain parts of the regulator and the electric blanket (or electric yaw) main body are in a bad state, and it is inevitable that there is a function of a safety circuit that can prevent such a state. It becomes indispensable. That is, when the SCR in the output circuit 6 is short-circuited, overpower is applied to the heater, which leads to a temperature overheating condition. In this case, a large path in the path of (SCR) → (D ₃ ) → (SF) in FIG. The current may flow and the circuit may be interrupted by temporarily disconnecting the fuse SF. Such a safety circuit is indicated by reference numeral 7 in FIG.

On the other hand, when the circuit is over-controlled or the circuit becomes uncontrollable due to other reasons, the circuit is overheated. In such an overheated state, the thermal layer (nylon thermistor) 13 between the heater 11 and the sensing line 12 is overheated. Since the melt | dissolution melt | dissolves and the heater 11 and the sensing line 12 are short-circuited, electric current flows in the path of (heater) → (sensing line) → (R ₃ ) → (D ₂ ), and the resistance R ₃ is heated. When the resistor R ₃ is heated in this manner, the temperature fuse TF sealed together with the resistor R ₃ is disconnected and the circuit is cut off. This safety circuit is indicated by reference numeral 8 in FIG. 1.

When the circuit is extremely shorted, the current fuse SF in the safety circuit 7 is momentarily disconnected to cut off the circuit, thereby preventing an extreme dangerous condition.

In FIG. 2, reference numeral SW denotes a power switch of a circuit, and reference numeral 9 denotes a lamp indicating that power is supplied to the circuit.

As described above, according to the present invention, even if any power supply voltage between 90V and 240V is applied, especially in an electric floor plate or an electric yoke, it consumes only a constant power and provides a constant temperature without requiring a separate operation of a user. It is possible to achieve the practical effect that the thermostat can be provided in a simple structure and inexpensively.

Claims (2)

Detecting a heater 11, a detection line 12 and the heat-sensitive layer 13, the heat generating portion (1), the sensor voltage (V _S) according to the temperature and / or changes in power supply voltage of from the heat-sensitive layer made of Temperature and voltage detection circuit 2, a reference voltage generation circuit 5 for generating a predetermined reference voltage V _R regardless of the power supply voltage, and the reference voltage V applied to generate a desired amount of power. _A variable voltage circuit (4) for varying _R ) to move the trigger point, and a sensor voltage (V _S ) from the temperature and voltage detection circuit (2) and an adjusted reference from the voltage variable circuit (4) Compare and trigger to accept the voltage V _R and compare them simultaneously and linearly generate a trigger pulse to the output circuit 6 only when the sensor voltage V _S is lower than the regulated reference voltage V _R. Triggered by the pulse generating circuit 3 and the trigger pulse And an output circuit (6) for vertically energizing the heater. 2. A thermostat according to claim 1, wherein safety circuits (7) and (8) are respectively added to block the flow of current at the time of overheating or short-circuit of the heat generating section (1).