KR900003778Y1 - Blame road control circuit in combustion device - Google Patents

Abstract

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Description

Frame Load Control Circuit of Combustor

1 is a frame load control circuit of a combustor according to the present invention.

2 is an operating waveform diagram of FIG.

3 is a flow chart of the microcomputer for explaining the operation of FIG.

* Explanation of symbols for main parts of the drawings

10: constant voltage circuit 20: frame load control circuit

30: room temperature sensing unit 40: microcomputer unit

50: burner motor drive unit 60: fan motor drive unit

70: display unit 80: set temperature detection unit

The present invention relates to a frame load control circuit of a combustor, and more particularly to a circuit for controlling the frame load of a combustor as direct current.

The frame load in the combustor is used to detect the flame state of the combustor, and is a device whose resistance changes according to the state of the flame.

For example, if the state of the flame is good, the frame rod resistance is lowered. If the state of the flame is poor due to incomplete combustion due to oxygen deficiency or the like, the resistance increases. In other words, the internal resistivity changes according to the temperature of the flame.

The reason why the frame rod is used in the combustor is to grasp the combustion state according to the intensity of the flame. In general, in the combustor, the amount of air according to the intensity of the flame serves as a basis for determining the combustion state, and the lack of oxygen in comparison with the intensity of the flame is called sintering, and a frame rod is used to search for the sintered state.

Since the conventional combustor frame rod control circuit for controlling the frame rod as described above is executed by the control by alternating current, the load state of the frame cannot be accurately detected and the error of the voltage generated by the alternating control cannot be eliminated.

Therefore, an object of the present invention is to provide a circuit capable of accurately detecting the load phenomenon of the frame and at the same time minimizing the error of the voltage generated by the AC drive to accurately perform the check.

Another object of the present invention is to provide a circuit that can check the frame load circuit to ensure the safety of the combustor itself.

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

1 is a frame load control circuit diagram of a combustor according to the present invention, and includes a constant voltage circuit 10 for rectifying a predetermined AC voltage into a DC voltage and outputting first and second voltages having different levels, and a frame rod. And a frame load control circuit 20 which is driven by the output second voltage and a predetermined control signal and outputs a detection voltage of a flame state of a combustor and the output first voltage and changes to room temperature. The indoor temperature sensing unit 30 outputs a temperature sensing voltage by the thermistor TH whose resistance changes according to the temperature, and is operated by inputting the output DC first voltage. The load control circuit 20 outputs a predetermined control signal and at the same time inputs the set temperature voltage, the output indoor temperature voltage, and the flame state detection voltage to burner by a built-in program. Outputs the motor BM and the fan motor driving signal, checks the calculation, and performs the kicking operation according to the calculation state; and the fan motor (B) by the fan motor driving signal output from the microcomputer 40. Inputting a fan motor driving unit 60 for driving the FM, a reset display unit 70 for displaying the reset of the microcomputer unit 40 and the rectified first voltage to set the temperature The set temperature sensor 80 is configured.

In the above-described configuration, the constant voltage circuit 10 includes a bridge diode BR for full-wave rectifying and outputting an AC voltage of a predetermined level input to the first AC input terminal ab, and the positive (+) of the bridge diode BR, The smoothing capacitor C3 connected between the negative voltage output terminals, the constant voltage transistor Q1 connected to the negative voltage output terminal of the bridge diode BR from ground, and the bridge diode BR. A diode D1 and a zener diode ZD1 connected to the base of the transistor Q1 from a positive voltage output terminal of the transistor Q1, and between an emitter of the transistor Q1 and the positive voltage output terminal. The first direct current voltage output circuit 12 composed of the connected smoothing capacitor C4, the rectifier diode D2 connected directly to the terminal C of the second ac input terminal dc with one terminal grounded, and the resistor ( R1) and a smoothing can connected to both terminals of the resistor R1 from the AC input terminal d. To a second DC voltage output circuit 14 composed of a sheeter C5-C6 and a smoothing capacitor C5-C6 connected to both ends of the capacitor C6 and a zener diode ZD2 connected to both ends of the capacitor C6. It is constructed.

In the frame load control circuit 20, the resistor voltage dividing circuit 22 outputs the first and second voltage dividing voltages V1 and V4 by connecting the resistors R2-R4 in series between the second voltage VF and the ground. ), The operational amplifier OP1, which is a voltage buffer for buffering the first divided voltage V1 of the resistance divided circuit 22, and the second divided voltage V4 and a control signal level of a predetermined level. An operational amplifier OP3 for outputting logic; a frame rod FR connected to an output terminal of the operational amplifier OP3 for outputting a flame state sensing current according to a change in resistance according to a combustion flame; The operational amplifier OP2 which amplifies the output difference of FR and the output difference of the operational amplifier OP1 and outputs the flame detection state voltage has input / output resistors R13-R15 and R5-R11.

In the room temperature sensing unit 30, resistors R17-R18 are connected in series between the first voltage Vcc and the ground, and a dehumidifier TH is connected to the resistor R18 to change according to the room temperature. The voltage according to the resistance change of the MR TH is output to the microcomputer 40 as a room temperature sensing voltage.

The burner motor driver 50 is connected between the transistor Q3 and the photo triac PT2 driven by the output of the microcomputer 40 between the first voltage Vcc and the ground, and the phototriac PT2. Is connected to the gates of the burner motor BM and the triac T2 connected in series between the AC terminals AC.

The pen motor driver 60 has a collector of the transistor Q2 driven by the output of the microcomputer 40 connected to the first voltage Vcc, a phototriac RT1 connected to the emitter, The photo triac RT1 is connected to the gates of the pen motor FM and triac T1 connected in series with the AC terminal AC.

The temperature setting unit 80 includes resistors R19 to R20 connected in series between the first voltage Vcc and the ground, and a variable resistor VR is connected to the resistor R20 to determine the resistance of the variable resistor VR. The voltage according to the variable is set as the temperature setting voltage and output to the microcomputer 40.

In addition, in the configuration of FIG. 1, the terminals B, C, E, and H of the microcomputer unit 40 are analog / digital converter (A / DC) input ports. Is digitally converted within

2 is a waveform diagram for explaining the operation of FIG. 1, a diagram is a circuit check pulse output from the microcomputer unit 40, b is a waveform diagram of the port E (H) of the microcomputer unit 40, Figure c shows the output of the frame load (FR), that is, the operational amplifier (OP2) input to the set-up check level and the port (B) set according to the room temperature.

d and e are driving signals of the pen motor driver 60 and the burner motor driver 70.

3 is a flowchart illustrating the operation of the first microcomputer 40 of FIG.

One embodiment according to the present invention will be described in detail with reference to FIGS. 1 to 3 with the assumption that the set temperature is higher than the room temperature.

When an AC voltage of a predetermined level is input to terminals (a) and (b) through a transformer (not shown), it is output after full-wave rectification at the bridge diode BR and the full-wave rectified output voltage is smoothed by the capacitor C3. It is done.

In this case, the voltage through the capacitor C3 is applied to the base of the transistor Q1 through the diode D1 and the zener diode ZD1.

Accordingly, the transistor Q1 is turned on to form a DC loop of the bridge diode BR, and the capacitor C4 smoothes the positive output of the bridge diode BR like the capacitor C3. The first voltage Vcc supplies the operating power to the microcomputer 40, the temperature setting unit 80, the indoor temperature sensing unit 30, the pen motor driver 60, and the burner motor driver 50.

On the other hand, the AC AC power input to the terminals d and c is half-rectified by the diode D2 and then smoothly output by the smoothing capacitors C5 and C6.

The voltage rectified by the diode D2 is a constant voltage by the zener diode ZD2, and the second voltage VF, which is a constant voltage by the diode ZD2, is the resistance voltage dividing circuit 22 and the frame load ( FR) and operational amplifiers OP1-OP3.

Looking at the role of the frame rod (FR), as described above to detect the flame state of the combustor as the flame rises the rod resistance is lowered, if the flame is low resistance is increased.

When the operating power supply voltage is supplied to each circuit as described above, the microcomputer unit 40 outputs the logic of “high” to the light emitting diode (LED) in the process of FIG.

At this time, the LED is turned on to emit light (lights up) and indicates that the system (combustor) is initially operated.

As described above, the microcomputer unit 40 which outputs the reset signal and turns on the light emitting diodes (LED) emits a low pulse as shown in FIG. 2 (a) in the process of FIG. The circuit is output to check the circuit of the frame load control circuit 20.

The reason for checking the operation of the circuit by outputting the low-pulse pulse to the port D in the process of FIG. 3 (b) is to determine whether the frame load FR is normal or not. Same as

In the process, when the low pulse is output from the port D of the microcomputer unit 40, it is input to the non-inverting terminal (+) of the operational amplifier OP3 through the resistor R15, and thus the operational amplifier ( The output of OP3) goes low.

At this time, the inverting terminal (-) and the non-inverting terminal (+) of the twist or amplifier OP2 are divided by the resistor R2-R4 and the capacitor C7 as shown in the following formula (1). An output voltage V2 of the operational amplifier OP1 that inputs the first divided voltage V1 to the non-inverting terminal (+) and buffers the output thereof is applied through the R7, the resistor R6, and the resistor R8, respectively. .

At this time, the operational amplifier OP1 increases the current input to the resistor R6 as a voltage buffer, and the output voltage V2 is almost equal to V1.

Therefore, as described above, when the microcomputer 40 outputs the low-low signal to the port D, the voltage V2 through the resistor R7 is input to the inverting terminal (-) of the operational amplifier OP2, and the non-inverting is performed. The voltage (V2) through the resistor (R6) and the resistor (R8) is input to the terminal (+), so that the operational amplifier (OP2) outputs the difference voltage V4 of the two input terminals.

At this time, the voltage divided by the resistors R10 and R11 to the same level as a1 in FIG. 2c is input to the port B of the microcomputer unit 40 through the resistor R12, and the port B If the input voltage of is a1, it is as following formula (2).

If after outputting to the output port (D) in a low state and the voltage of the same level as the above formula (2), that is, the same level as a1 in FIG. 2 (c) is not input to the port (B), the microcomputer unit 40 Detects that an error (error) has occurred in the frame load (FR) control circuit 20 in the process of FIG. 3 (C), and outputs a logic “high” signal to the reset terminal (REST) to generate a light emitting diode (LDE). Lights up and stops the operation of the combustor.

That is, it is a state of checking the error state of the frame load control circuit due to short circuit (SHORT) or development (OPEN).

On the other hand, when the voltage of the port (B) is equal to the value of Equation (2), it is determined that the operation of the frame load control circuit 20 is stable, and the microcomputer unit 40 starts the normal operation of the frame load.

When the normal operation starts, the microcomputer 40 detects the change of the thermistor TH, that is, the room temperature, through the (E) port in the process of FIG. 3 (d), which reduces the input power supply voltage VCC to the resistor R17. ) R18 and the voltage by the resistance change of the thermistor TH are sensed and executed, and this is performed by the following equation (3).

* RTH is the resistance of the thermistor (TH). (Negative Thermistor)

Therefore, as the room temperature increases, the resistance (TH) of the thermistor (TH) also decreases, and the microcomputer (40) reads the state changed by the above equation (5) into the (E) port, which is an A / D conversion port. It will detect the room temperature.

The microcomputer 40 which inputs the indoor sensing temperature voltage to the input port E converts the set temperature low pressure set by the user by the control of the variable resistance VR in the process of FIG. 3 (e) to the A / D conversion input port. Enter the (H) port to calculate the level difference between the (E) and (H) ports.

At this time, if the output voltage of the temperature setting unit 80 is V6, it is as follows.

Therefore, the temperature setting voltage V6 may be adjusted by adjusting the variable resistor VR.

As described above, the microcomputer unit 40 that calculates the difference between the room temperature sensing port 3 and the set temperature sensing port H checks the sintering to control the flame intensity with respect to the level difference between the ports E and H. The level is searched and port B reads the state of the frame load in the process of FIG.

At this time, the check level is set in the microcomputer 40 according to the difference between the room temperature and the set temperature, the check level when the set temperature is higher than the room detection temperature as shown in (b) of FIG. Is set as high as ＂1＂ in FIG. 2 (c), and when the room temperature is close to or higher than the set temperature, the level is set as low as 2,3,4,5,6 in FIG. Lose.

The setting check level is a reference for making a check. In the combustor, the amount of air in accordance with the intensity of the flame is the basis for identifying the combustion state as described above, and the lack of oxygen in comparison with the intensity of the flame is called sintering. do.

On the other hand, the microcomputer unit 40 that inputs the flame detection voltage due to the resistance change of the frame rod FR in the process of FIG. 3 (f) outputs the flame to control the flame according to the level difference between the room temperature and the set temperature. (G) and (F) output burner motor driving signals and pen motor driving signals as shown in FIGS. 2 (d) and (e) in FIGS. Drive to keep the flame and combustion state strongest.

At this time, the pulse as shown in FIG. 2 (e) is switched at a high speed of the transistor Q3 input through the resistor R23. As a result, the phototriac PT2 is switched to operate the triac T2. Burner motor (BM) runs at high speed. In addition, the transistor Q2 inputs the pulse as shown in FIG. 2 (d) through the resistor R21 at a high speed and is rapidly switched to the phototriac PT to trigger the triac T1 so that the fan motor ( FM) also runs at high speed.

Therefore, it is rotated at high speed by burner motor (BM) and pen motor (FM) to achieve the best flame and combustion conditions.

On the other hand, the microcomputer unit 40 that inputs the flame state voltage to the input port B in the above-described third process (f) has a level of the input voltage, that is, the voltage V4 output from the operational amplifier OP2 is set to zero. As shown in (1) of FIG. 2 (A), it is searched in the process of FIG.

If the flame detection voltage is high, the microcomputer 40 has a good combustion state, i.e., it is determined that the flame state is good because oxygen is sufficient, so that the normal operation can be continuously performed in FIGS. 3 (j) and (k). Outputs a signal such as

In this case, the voltage input value of the input port B of the microcomputer 40 may be written as in Equation 5 below.

A state in which a voltage similar to the above formula (5) is input to the port B of the microcomputer unit 40 will be described.

When the output of the output port D of the microcomputer unit 40 goes from low to high as shown in FIG. 2 (a), the operational amplifier OP3 outputs a high level signal that is a logic of a predetermined level. It is input to the frame rod FR through the resistor R13.

In this case, as described above, the frame rod FR has a low resistance when the flame is combusted and a high resistance when the flame is incomplete due to incomplete combustion, thereby inverting the operational amplifier OP2 according to the flame state. The input voltage V3 of the terminal changes.

In Equation (5), V3 is expressed by Equation (6) below when the output of the operational amplifier OP3 is Vop3.

RFR is the resistance of the frame load (FR)

Therefore, the resistance of the frame rod FR whose resistance value changes depending on the state of the flame affects the output of the operational amplifier OP2. The worse the state of the flame, the more the input of the flame load is input to the port B of the microcomputer 40. The voltage is reduced.

On the other hand, if the temperature voltage detected by the thermistor (TH) reaches the section of FIG. 2c (b), the microcomputer unit 40 lowers the result of the check of the level by rechecking the setting level, as shown in FIG. For this reason, the microcomputer 40 outputs signals such as the second e diagram and (d) to the output ports F and G.

Therefore, the switching speeds of the transistors Q2 and Q3 are lower than the previous state, and the speeds of the fan motor FM and the burner motor BM operate at a slower speed.

At this time, if the flame state detection voltage level input to the (B) port of the microcomputer unit 40 is higher than the sintered check level, the microcomputer unit 40 operates the combustor normally.

When the operation time as described above lasts for a long time, the room temperature is very high, and when the indoor sensing temperature reaches the section (b) of FIG. 2b, the calculation check level is lowered as shown in (6) of FIG.

As described above, if continuous operation is continuously executed in the state where the check level of the drop is lowered as shown in (6) of FIG. 2C (in case the room temperature is higher than the set temperature), the flame state is poor due to the lack of oxygen in the surrounding room. The resistance RFR of is increased, which causes the output of the operational amplifier OP2 to output as shown in Equation (5).

Therefore, the frame load voltage input to the (B) port of the microcomputer unit 40, that is, the flame state detection voltage as shown in FIG.

The calculation check level 1-6 in Fig. 2C is stored in the microcomputer.

At this time, the microcomputer unit 40 determines that there is insufficient oxygen, that is, a state of acidification (defect of acid), so that incomplete combustion is performed in the combustor.

When the determination is made in the above-mentioned state, the microcomputer unit 40 sends a high frequency pulse to the reset terminal to brighten the light emitting diode LED1 to display incomplete combustion to the user.

In addition, when the determination is made, the microcomputer unit 40 stops and extinguishes all operations of the combustor, and operates the fan motor FM burner motor BM as the strongest to vent smoke generated by incomplete combustion.

In the above-described configuration, the resistances R17 and R18 of the sensing circuit 30 are designed to improve the characteristics of the thermistor TH that senses the room temperature, and the resistances R19 of the temperature setting unit 80 ( R20) is to be able to adjust the set temperature accurately.

Looking at the flow again with reference to the flow chart of FIG.

First, the circuit is checked and the circuit check determines whether the circuit is good, and if it is normal, the next function is performed. If not, the microcomputer unit 40 outputs a reset signal to display the light emitting diode (LED).

If the circuit is good, it detects room temperature (＂E＂ prot), detects set temperature (＂H＂ prot), and drives burner motor (BM) and fan motor (FM) according to the difference, Check the calculation.

As a result of detection and detection, the burner motor (BM) and the fan motor (FM) are driven to the strongest when it is in an acidic state (lack of oxygen), and the circuit check function is performed again when normal.

Therefore, as described above, the present invention can accurately detect the phenomenon of the frame rod by controlling the frame rod with a DC voltage, minimize the voltage error caused by the charging alternating current, and make the sinter check clear. By adding the frame load circuit check function for safety of use, the entire frame load control circuit can be inspected to ensure the safety of the combustor itself.

Claims (1)

A frame load control circuit of a combustor, comprising: a constant voltage circuit (10) for rectifying a predetermined AC voltage into a DC voltage to output a first voltage and a second voltage having different levels, and the output DC second voltage and a predetermined voltage. A frame load control circuit 20 which is driven by a control signal and outputs a detection voltage of a flame state of a combustor, and an indoor temperature detection unit which inputs the output first voltage and outputs a temperature detection voltage according to a change to an indoor temperature 30 and the output DC first voltage is operated and reset, and outputs a predetermined control signal to the frame load control circuit 20 during initial operation, and at the same time, the set temperature voltage and the output room temperature voltage. Set the level of the summing due to the difference between the two, and output the burner motor (BM) and the fan motor (FM) driving signals, and the flame state detection voltage and the acid output from the frame load control circuit 20. The fan motor driving signal output from the microcomputer unit 40, the microcomputer unit 40, and the microcomputer unit 40 which perform the next act according to the result of the determination of the state of the check by comparing the check levels. By inputting the fan motor drive unit 60 for driving the fan motor FM, the reset display unit 70 for displaying the reset of the microcomputer unit 40, and the rectified first voltage. Frame load control circuit of the combustor, characterized in that composed of a set temperature sensing unit 80 for outputting a set voltage.