KR100990454B1 - Circuit for monitoring driving condition of heater, and heater with the said circuit - Google Patents

Abstract

The present invention relates to a heater operating state monitoring circuit and a heater having the circuit, and more particularly, to a heater operating state monitoring circuit and a circuit for reducing the manufacturing cost by simplifying the heater operating state monitoring circuit. It is related with the heater provided.

One example of an operation state monitoring circuit according to an embodiment of the present invention includes a current detection sensor for detecting a power supply current supplied to a power source of a heater and outputting a voltage value according to the power supply current value; And an abnormal state detection unit determining whether the voltage value is out of a predetermined voltage range value.

Heater operation monitoring circuit, abnormal state detection unit, OP-AMP

Description

Circuit for monitoring driving condition of heater, and heater with the said circuit}

The present invention relates to a heater operating state monitoring circuit and a heater having the circuit, and more particularly, to a heater operating state monitoring circuit and a circuit for reducing the manufacturing cost by simplifying the heater operating state monitoring circuit. It is related with the heater provided.

In order to keep the temperature and humidity inside the equipment in a proper state at all times, it is a system to check the abnormal operation of the heater by installing the heater inside the equipment.

The items required in such a system should be able to inform the remote control equipment of an abnormal condition when the heater malfunctions. In this way, to check the operation of the heater, attach a temperature sensor to the heater to check that the heater is operating when the temperature rises, or connect the status lamp to check whether the heater is supplied to the power line of the heater in parallel When power is applied to the heater, there is a method of checking the state by turning on the lamp.

On the other hand, such a heater operation state monitoring circuit has a disadvantage in that it is not known whether the heater is operating properly by checking only whether power is applied to the heater.

In addition, such a heater operating state monitoring circuit must be equipped with an analog-to-digital converter (A / D converter) to monitor the current consumption, and a microprocessor to monitor the state of the AC input current. This is to calculate the root mean square (RMS) value of the AC power current consumed by the heater through the microprocessor, and to determine whether it corresponds to an appropriate current consumption of the heater.

On the other hand, the A / D converter and the microprocessor of the heater operating state monitoring circuit as described above has the disadvantage of increasing the manufacturing cost of the heater operating state monitoring circuit.

The present invention provides a heater operating state monitoring circuit and the circuit which can reduce the manufacturing cost of the heater operating state monitoring circuit by removing the A / D converter and the microprocessor from the heater operating state monitoring circuit and simplifying the circuit. Its purpose is to provide a heater.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

One example of the heater operating state monitoring circuit according to an embodiment of the present invention includes a current detection sensor for detecting a power supply current supplied to the power supply of the heater and outputting a voltage value according to the power supply current value; And an abnormal state detection unit determining whether the voltage value is out of a predetermined voltage range value.

Here, the abnormal state detection unit may include an overcurrent monitoring unit for monitoring whether the voltage value is greater than or equal to the preset maximum setting value, and a low current monitoring unit for monitoring whether the voltage value is less than or equal to the preset minimum setting value.

Here, the overcurrent monitoring unit may include a maximum output comparator for outputting an abnormal state signal when the voltage value is greater than or equal to the maximum set value.

Here, the maximum output comparator may include an operational amplifier (OP-AMP), and the operational amplifier (OP-AMP) may output a turn-on signal when the voltage value is greater than or equal to the maximum set value.

The low current monitoring unit may further include: a minimum output comparator configured to determine whether the voltage value is less than or equal to the minimum set value; And a minimum sensing circuit configured to output an abnormal state signal when the voltage value is less than or equal to the minimum set value.

Here, the minimum output comparator may include an operational amplifier (OP-AMP).

Here, the OP-AMP may output a turn off signal when the voltage value is less than or equal to the minimum set value.

In addition, the minimum sensing circuit may include a retrigger circuit.

Here, the retrigger circuit may output a turn on signal when a turn off signal is input.

The heater operation state monitoring circuit may further include an abnormal state display unit indicating that the heater operation is abnormal when the voltage value is out of a predetermined voltage range value.

In addition, the heater including the heater operation state monitoring circuit according to an example of the present invention includes the heater operation state monitoring circuit as described above.

In addition, the operating state monitoring method according to an embodiment of the present invention includes a current detection step of detecting a power supply current supplied to the power of the heater and outputs a voltage value according to the power supply current value; And an abnormal state sensing step of determining whether the voltage value is out of a predetermined voltage range value.

The abnormal state detecting step may include an overcurrent monitoring step of monitoring whether the voltage value is greater than or equal to a preset maximum setting value, and a low current monitoring step of monitoring whether the voltage value is less than or equal to a preset minimum setting value. .

Here, the overcurrent monitoring step may output an abnormal state signal when the voltage value is greater than or equal to the maximum set value.

Also, the low current monitoring step may include a minimum output comparing step of determining whether the voltage value is less than or equal to the minimum set value; And a minimum sensing step of outputting an abnormal state signal when the voltage value is less than or equal to the minimum set value.

The heater operating state monitoring method may further include an abnormal state displaying step of indicating that the heater operation is abnormal when the voltage value is out of a predetermined voltage range value.

The heater operating state monitoring circuit and the heater having the circuit according to the present invention, unlike the conventional, removes the A / D converter and the microprocessor, and by using the OP-AMP and Retrigger circuit, which minimizes the volume and reduces the manufacturing cost It works.

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

First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

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

1 is a view for explaining an example of a heater operating state monitoring circuit according to the present invention.

As shown in FIG. 1A, the heater operation state monitoring circuit includes a current detection sensor 10, an abnormal state detecting unit 20, and an abnormal state displaying unit 30. Here, the heater is shown as an example of a general home, but, alternatively, a heater mounted inside the equipment is equally applied to maintain a proper temperature and humidity in a specific device, and heater operation according to the present invention. The condition monitoring circuit is also applicable to a system for remotely checking an abnormal operation state of a heater mounted inside the equipment.

The current detection sensor 10 detects a power supply current supplied to the power of the heater and outputs a voltage value according to the power supply current value. The heater is operated by receiving AC power. In addition, the value of the current consumption of the heater is determined according to the power consumption according to the specification of the heater.

In order to measure the current consumption of the heater, the current detection sensor 10 is connected in series to the AC power input terminal of the heater, and converts the current consumption value of the heater into a voltage value and outputs it. Therefore, since the power current supplied to the heater has an AC value, the measured voltage value output by measuring the AC power current from the current detection sensor 10 also has an AC value.

Therefore, the current detection sensor 10 measures the AC power current to output the AC voltage value.

The abnormal state detecting unit 20 functions to determine whether the voltage value is out of a predetermined voltage range value. As shown in FIG. 1B, it is determined whether the maximum value of the measured AC voltage is between a predetermined voltage range value Vn between a preset maximum voltage value Vmax-minimum voltage value Vmin, and If it is out of the predetermined voltage range value Vn, an abnormal state signal is generated.

By doing in this way, it is possible to know whether a heater consumes appropriate consumption current, and, thereby, can confirm whether the operation state of a heater is correct.

More specifically, if the heater is short-circuited in the internal circuit, the current consumption suddenly greatly increases and an overcurrent flows, and the measured AC voltage value output from the current detection sensor 10 will also greatly increase. As described above, when the measured AC voltage value exceeds the maximum voltage value Vmax, the abnormal state detecting unit 20 outputs an abnormal state signal.

In addition, if the heater is open in the internal circuit (Open), the current consumption is suddenly greatly reduced, the low current flows, and the measured AC voltage value output from the current detection sensor 10 will also be greatly reduced. As described above, when the measured AC voltage value is less than the minimum voltage value Vmin, the abnormal state detecting unit 20 outputs an abnormal state signal.

The abnormal state display unit 30 functions to indicate that the heater operation is abnormal when the voltage value is out of the predetermined voltage range value. In this case, indicating that the operation of the heater is abnormal may make a sound through the speaker or emit light through a light emitting element such as an LED.

2 is a view for explaining an example of the abnormal state detection unit 20 in an example of the heater operation state monitoring circuit according to the present invention.

The abnormal state detecting unit 20 may include an overcurrent monitoring unit 21 and a low current monitoring unit 25 as shown.

The overcurrent monitoring unit 21 functions to monitor whether the voltage value is greater than or equal to a preset maximum set value Vmax. The overcurrent monitoring unit 21 may include a maximum output comparator for outputting an abnormal state signal when the voltage value is greater than or equal to the maximum set value (Vmax). For example, the OP-AMP (Operational Amplifier) may include an overcurrent monitoring unit ( 21) can be used as a comparator.

The low current monitoring unit 25 functions to monitor whether or not the voltage value is equal to or less than a predetermined minimum set value Vmin. The low current monitoring unit 25 outputs an abnormal state signal when the minimum output comparator 26 determines whether the voltage value is less than or equal to the minimum set value (Vmin) and when the voltage value is less than or equal to the minimum set value (Vmin). It may include a minimum sensing circuit (27).

As an example of the minimum output comparator 26 an Operational Amplifier (OP-AMP) can be used as the comparator and the Retrigger circuit can be used as the minimum sense circuit 27.

If the abnormal state signal is output to either the overcurrent monitoring unit 21 or the low current monitoring unit 25, the abnormal state signal is input to the abnormal state display unit 30 through the OR gate.

In this way, by using an OP-AMP (Operational Amplifier) as a comparator in the overcurrent monitoring unit 21 or the low current monitoring unit 25, a circuit can be simplified and a separate A / D converter (Analog to Digital Converter) can be used. There is no need to use), and there is no need to install a separate microprocessor to monitor the state of the AC power current and analyze the state, which greatly reduces manufacturing costs.

Specific circuit examples and operations of the overcurrent monitoring unit 21 and the low current monitoring unit 25 as described above will be described below.

3A is a view for explaining an example of the overcurrent monitoring unit 21 in the example of the abnormal state detection unit 20 according to the present invention. 3B is a diagram for explaining an example of the operation of the overcurrent monitoring unit 21 according to FIG. 3A.

As illustrated in FIG. 3A, the overcurrent monitoring unit 21 may use a maximum output comparator that outputs an abnormal state signal when the measured AC voltage value is greater than or equal to the maximum set value Vmax. op1) can be used. The OP-AMP op1 may output a turn-on signal when the measured AC voltage value is greater than or equal to the maximum set value Vmax.

In more detail, OP-AMP can be used in various ways such as a buffer, a differentiator, an integrator, a comparator, etc. In the present invention, OP-AMP (op1) is used as a comparator. When using OP-AMP (op1) as a comparator in this way, the maximum setting value (Vmax) is applied to the "-" terminal of OP-AMP (op1), and the measured AC voltage is applied to the "+" terminal. As shown in FIG. 3B, the OP-AMP (op1) outputs an abnormal state signal, that is, a turn-on signal of approximately 5V only in a period of t1 at which the measured AC voltage becomes greater than or equal to the maximum set value Vmax. will be.

4A is a view for explaining an example of the low current monitoring unit 25 in the example of the abnormal state detection unit 20 according to the present invention. 4B is a diagram for explaining an example of the operation of the low current monitoring unit 25 according to FIG. 4A.

As shown in FIG. 4A, the low current monitor 25 may include a minimum output comparator 26 and a minimum sensing circuit 27.

The minimum output comparator 26 determines whether the measured AC voltage value is less than or equal to the minimum set value Vmin, and may use OP-AMP (op2) as an example of the minimum output comparator 26. The OP-AMP (op2) outputs a turn-on signal when the measured AC voltage value is greater than or equal to the minimum set value (Vmin), and turns when the measured AC voltage value is lower than or equal to the minimum set value (Vmin). -Turn Off signal can be output.

The minimum sensing circuit 27 outputs an abnormal state signal when the voltage value is less than or equal to the minimum set value Vmin, and a retrigger circuit may be used as an example. Such a retrigger circuit may output a turn on signal when a turn off signal is input.

4A and 4B together to explain the operation method of the low current monitoring unit 25 in detail, in FIG. 4B, when the measured AC voltage value is a steady state and higher than the minimum set value Vmin. In FIG. 4A, the OP-AMP op2 of the minimum output comparator 26 outputs a turn-on signal as in the periods t1 and t2 when the measured AC voltage value becomes higher than the minimum set value Vmin.

)가 입력될 때 턴 온 신호를 출력하게 된다. 이와 같이 AND 게이트(And)가 턴 온 신호를 출력하는 경우, 플립 플롭(ff)의 Q에서는 턴 온 신호가 출력되고,

에서는 턴 오프 신호가 출력된다. 최소 감지 회로(27)는 플립 플롭(ff)의 출력 중

출력 신호를 이상 상태 신호로 사용하므로 t1, t2 기간과 같이, 측정 AC 전압 값이 정상 상태 신호로 판단될 때에는 이상 상태 신호가 출력 되지 아니한다.In this way, the output turn-on signal is input to the AND gate And of the minimum sensing circuit 27. The NOT gate ng is always turned on because it is connected to the ground voltage GND. Therefore, when the input from the OP-AMP (op2) is a turn-on signal, the AND gate And is used for every clock signal (

Outputs a turn-on signal when) is input. In this way, when the AND gate And outputs the turn-on signal, the turn-on signal is output at Q of the flip-flop ff,

In turn, the turn off signal is output. The minimum sense circuit 27 is the output of the flip flop (ff)

Since the output signal is used as an abnormal state signal, the abnormal state signal is not output when the measured AC voltage value is determined to be a steady state signal, such as in periods t1 and t2.

에서는 턴 온 신호를 출력한다. 이와 같이

에서 출력된 턴 온 신호는 이상 상태 신호로서 이상 상태 표시부(30)로 공급된다.However, when the measured AC voltage value is an abnormal state and lower than the minimum set value Vmin, in FIG. 4A, the OP-AMP (op2) of the minimum output comparator 26 has the measured AC voltage value higher than the minimum set value Vmin. The turn-off signal is output as in the periods t3 and t4, which are points of decreasing. As such, the output turn off signal is input to the AND gate And of the minimum sensing circuit 27, and the AND gate And inputs the turn off signal to the flip flop ff. In this case, flip-flop ff toggles the output so that at Q, a turn off signal is obtained.

Outputs a turn on signal. like this

The turn-on signal output from is supplied to the abnormal state display unit 30 as an abnormal state signal.

)와 다르게 비주기적으로 최소 설정값(Vmin) 이하로 지속되는 경우 이상 상태 신호를 출력하게 되는 것이다.As such, the low current monitoring unit measures the AC voltage of the periodic clock signal (

Unlike), if it continues below the minimum set value (Vmin) aperiodically, an abnormal status signal is output.

By simplifying the abnormal state detection circuit that detects the abnormal state of the heater, there is no need to use a separate A / D converter (Analog to Digital Converter), and to monitor the state of the AC power current and analyze the state. Since there is no need to install a separate microprocessor, the manufacturing cost can be greatly reduced.

Meanwhile, the above-described embodiments of the present invention have been described only in the case where the abnormal state detection circuit is configured separately from the heater. Alternatively, the embodiment may be included and used inside the heater.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but rather to describe the present invention. no. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a view for explaining an example of a heater operating state monitoring circuit according to the present invention.

2 is a view for explaining an example of the abnormal state detection unit 20 in an example of the heater operation state monitoring circuit according to the present invention.

3A is a view for explaining an example of the overcurrent monitoring unit 21 in one example of the abnormal state detection unit 20 according to the present invention.

FIG. 3B is a view for explaining an example of the operation of the overcurrent monitoring unit 21 according to FIG. 3A.

4A is a view for explaining an example of the low current monitoring unit 25 in the example of the abnormal state detection unit 20 according to the present invention.

4B is a view for explaining an example of the operation of the low current monitoring unit 25 according to FIG. 4A.

<Description of reference numerals for the main parts of the drawings>

10: current detection sensor 20: abnormal state detection unit

30: abnormal state display unit 21: overcurrent monitoring unit

25: low current monitoring unit 26: minimum output comparator

27: minimum sensing circuit

Claims (16)

delete delete delete A current detection sensor detecting a power supply current supplied to a power supply of the heater and outputting a voltage value according to the detected power supply current; And It is determined whether the heater is operating normally by determining whether the voltage value is out of a predetermined voltage range value, and includes a maximum output comparator and whether the voltage value is greater than a preset maximum set value through the maximum output comparator. An over-current monitoring unit for determining whether the internal circuit of the heater is short-circuited by monitoring whether there is a short circuit, and a minimum output comparator, and monitoring whether the voltage value is less than or equal to a preset minimum setting value through the minimum output comparator Abnormal state detection unit including a low current monitoring unit for determining whether the internal circuit of the heater is open Including; The maximum output comparator includes an operational amplifier (OP-AMP), The operational amplifier (OP-AMP) outputs a turn-on signal when the voltage value is greater than or equal to the maximum set value. delete A current detection sensor detecting a power supply current supplied to a power supply of the heater and outputting a voltage value according to the detected power supply current; And It is determined whether the heater is operating normally by determining whether the voltage value is out of a predetermined voltage range value, and includes a maximum output comparator and whether the voltage value is greater than a preset maximum set value through the maximum output comparator. An over-current monitoring unit for determining whether the internal circuit of the heater is short-circuited by monitoring whether there is a short circuit, and a minimum output comparator, and monitoring whether the voltage value is less than or equal to a preset minimum setting value through the minimum output comparator. Abnormal state detection unit including a low current monitoring unit for determining whether the internal circuit of the heater is open Including; The minimum output comparator includes an operational amplifier (OP-AMP), The operational amplifier (OP-AMP) outputs a turn-off signal when the voltage value is less than or equal to the minimum set value. delete The method of claim 6, The low current monitoring unit further includes a minimum sensing circuit that outputs an abnormal state signal when the voltage value is less than or equal to the minimum set value. And the minimum sensing circuit comprises a retrigger circuit. The method of claim 8, The retrigger circuit And a turn on signal is output when the turn off signal is input. delete A heater comprising a heater operating state monitoring circuit, 10. A heater comprising a heater operating state monitoring circuit according to any one of claims 4, 6, 8 and 9. delete delete delete delete delete

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