JPS6224701B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a control device for a hot air fan, particularly a hot air fan using oil as fuel, and provides a new hot air fan control device that significantly improves usability and promotes improved safety. provide. BACKGROUND ART FIG. 15 shows a conventional hot air fan control device.
In the figure, the operating switches are switch 300,
Consisting of 301, 300 is an on/off switch, 3
01 remains on for a moment when the operation switch is turned on. Therefore, relay 302
is self-held by its contact 302-1, and the oil pump 303 and ignition heater 304 are energized, and the burner fan motor 305 is energized by the second contact 302-2 of the relay 302. Additionally, the operation lamp 306 lights up. When the burner temperature rises and the burner thermoswitch 307 is turned on, the convection fan motor 308 is driven and hot air is discharged. 309 is a convection fan strength changeover switch. Furthermore, when the burner thermometer 307 is turned on, the relay 310 is turned on, and its contact 301 is turned on.
-1 and 301-2 are opposite to those shown in the figure, and the ignition heater 304 is de-energized. 311, 312,
313 is a temperature fuse, a thermoswitch to prevent excessive temperature rise, and a vibration extinguishing switch. Driving switch 3
When 00 is turned off, the relay 302 is turned off, and its contacts 302-1 and 302-2 are in the illustrated state. While the burner temperature is high, the convection fan motor 308, burner fan motor 305, and relay 310 are energized to perform post-purging. 3
14 is a timer motor, and its contact 314-
A, 314-b, and 314-c are usually as shown in the figure, and are so-called ignition timers.
This is an ignition timer that starts operation after a certain period of time.
When the timer is set, contact 314-a is turned off.
314-b is turned on, 314-c is turned off, and the timer motor 314 is driven. When the set time elapses, contacts 314-a,
314-b closes, then 314-c, 314-b
is turned off. Therefore, the ignition timer causes the relay 302 to self-hold, and the hot air fan starts operating. Problems to be Solved by the Invention In the conventional hot air fan control device as described above, when operating manually, it is necessary to operate an operation switch that mechanically interlocks two switches, and also to set an ignition timer. Even in this case, a mechanical timer motor had to be set, which was troublesome. Furthermore, for example, when the ignition heater 304 breaks down, the pump 303 continues to operate, causing oil to accumulate in the burner, which is troublesome as it is necessary to remove the oil from the burner when repairing. Furthermore, even when the burner thermoswitch malfunctioned and did not operate, the burner could reach extremely high temperatures, creating a dangerous situation. When trying to automatically adjust the room temperature, it is necessary to switch the pump's heat flow rate with a relay, etc., or to switch the burner fan motor with a _relay . However, the temperature swing of the hot air discharge temperature was extremely large, and the heating sensation was not favorable. Means for Solving the Problems The present invention has been made in view of these points, and is constituted by the means described below. That is, it has a first storage section that stores a program for controlling combustion, a control section that performs combustion control according to this program, and a control section that is driven by this control section and operates at least at a preset time. The control unit includes a timer device to start the operation, and a commercial power source and an auxiliary power source that supply power to the control unit, and the control unit stores the operation start time set in the timer device and causes the operation to start at the stored time. The auxiliary power supply has a second storage unit that drives the timer device, and has at least two
The auxiliary power supply includes an inhibition circuit that stops the power supply from the commercial power supply and simultaneously stops the execution of the program when the capacitor voltage falls below a certain level. Effect: The above means makes the operation of the control section having the storage section reliable and safe even in the event of a power outage of the commercial power supply. As a result, we can constantly monitor parts failures, display any abnormalities, and operate the hot air fan with just one touch.
It has the function of displaying the operating status (igniting, burning, extinguishing) and making the hot air fan extremely easy to use. Embodiment FIG. 1 is an embodiment of the present invention, and is a block diagram of an oil hot air heater. In the figure, 1 is a warm air fan main body, and 2 is an operating section provided on the front side of the main body 1. Indoor air is sucked in through a suction port 3 by a convection fan 4 as indicated by an arrow in the figure, undergoes heat exchange with a heat exchanger 5, and is discharged from an outlet 6. Inside the heat exchanger 5, a burner section 7 and an ignition heater 8 are installed.
Fuel is sent through an oil pipe 10 by a pump 9, combustion air is supplied from an intake pipe 12 to a burner section 7 by a burner fan 11, and combustion exhaust gas is exhausted from an exhaust pipe 13. 7a is a burner thermoswitch. Reference numeral 14 denotes a control device that controls the combustion sequence, etc., based on control signals from the operating section 2 and temperature signals from a burner temperature detector (a flame presence/absence detector may also be used) that detects the temperature near the burner section. , based on the signal from the intake air temperature sensor 15, the solenoid 16 is controlled, the combustion air amount adjustment damper 17 is controlled, and the combustion amount is controlled. Here, the burner section 7 will be explained with reference to FIG. 2. The burner section 7 includes a burner body 7'.
The burner body 7' is made of ceramic with many pores 18 formed therein. A portion of the air sent from the burner fan passes through pores 18 in the burner body 7', as indicated by the arrows in the figure. Reference numeral 19 denotes an oil feed/discharge portion of the pump, from which combustion oil is sprayed onto the lower part of the burner body 7'.
When the upper surface of the porous ceramic burner body 7' is heated by the ignition heater 8, the oil is vaporized and ignited. The oil sprayed onto the burner body 7' from the oil supply discharge part 19 permeates into the porous ceramic. At this time, if the amount of combustion air sent from the burner fan is changed, the pores 18 of the burner body 7'
The amount of air passing through changes. Therefore, the combustion charge q changes almost proportionally as the amount of combustion air Q changes, as shown in FIG. Next, the damper 17 and solenoid 16 will be described. FIG. 6 shows an example of the damper 17 and the solenoid 16. In the figure, 20 is the solenoid 16
A plunger 22 including a magnet 21 is fixed to the inside by leaf springs 23a and 23b, and coils 24a and 24b are wound around the outside. l ₀ , l ₁ , l ₂ are lead wire terminals from terminal l ₀
When a DC current is applied to l ₂ , the plunger 22 moves in the direction of the arrow in the figure, and when a DC current is applied from l ₀ to l ₁ , the coils 24a and 2 move in the opposite direction to the arrow.
4b is wound. Although the permanent magnet 21 is used in this example, the permanent magnet 21 may be omitted if the plunger 22 is made of a ferromagnetic material and the relative positional relationship with the coils 24a and 24b is appropriately selected. The movement of the plunger 22 is controlled by transmission parts 25a, 25b, 25c.
This is transmitted to the damper rotating section 26 by. Reference numeral 27 denotes a fulcrum provided at an appropriate position of the transmission portion 25b. When the plunger 22 moves to the right in the figure, the damper rotating part 26 rotates counterclockwise, and the opening 26'
Then, the overlapping portion 29 with the opening 28' of the damper fixing portion 28 expands. Therefore, the amount of combustion air Q increases and the amount of combustion q increases. Also plunger 2
2 moves to the left, the operation is opposite to that described above, and the overlapping portion 29 of the damper openings becomes smaller, so the combustion amount q decreases. Reference numerals 30, 31, and 32 determine the rotation angle of the damper rotating portion, and regulate the maximum and minimum combustion amounts to desired values. The operating section 2 (FIG. 1) has operating switches and display means shown in FIG. 3. In FIG. 3, numeral 33 is a fluorescent display tube for displaying the time, and numeral 34 is a function switch. When this rotary switch is in position a, the clock can be adjusted. That is, the numeric key 35, 3
6, 37, and 38 allow the clock to synchronize.
35, 36, 37, 38 are each 10 when pressed once
This is a push switch that adds 1 to the hour digit, 1 o'clock digit, 10 minute digit, and 1 minute digit, and 39 is a clear switch. Rotary switch 34 b
When the watch is returned to the position shown in FIG. When the rotary switch 34 is set to position c, the light emitting diode (LED) 40 blinks, and the time to start the hot air fan is set using the number keys 35 to 35.
It can be set using 38. At this time, the clock display disappears. Next, when the rotary switch is moved to position d, the LED 40 changes from flashing to lit, indicating that the operation start time has been programmed. In addition, the LED 41 blinks and the operation stop time can be set using the number keys. When you turn the rotary switch to position e after keying in the operation stop time, the LED 43 will flash, indicating that you can set the time at which the buzzer 42 will sound and the alarm sound will be generated.
1 turns on, indicating that the stop time has been programmed. After keying in the alarm time, when the rotary switch is returned to position b, the LED 43 turns on and the fluorescent display tube 33 returns to displaying the clock. To reconfirm the set operation start time, operation stop time, and alarm time, turn the rotary switch to the corresponding position again, and the fluorescent display tube will change from the clock display to the set time display. 44 is a temperature setting device and a variable resistor. 45 is a manual operation switch, and when this is pressed, LED 46 flashes and ignition starts. As soon as the temperature of the heat exchanger becomes high enough and hot air is discharged, the LED 46 changes from flashing to lit to indicate that combustion is in progress. 47 is an operation stop switch, and when this is pressed, the LED 46 changes to blinking at a longer cycle than the blinking when igniting, indicating that the fire is being extinguished. When the burner temperature drops sufficiently, the LED 46 turns off. When the warm air fan is operated by the aforementioned program timer, the timer operation switch 48 can be used. That is, when the timer operation switch 48 is pressed when the operation start time is programmed, the LED 49 lights up to indicate that the timer is operating. When the programmed start time is reached, the LED 46 will flash.
The operation is the same as in manual operation described above. If a stop time has not been programmed (LED 41 is not lit), LED 49 will stop lighting (go out), indicating that the program timer will no longer operate. When a stop time is programmed,
The LED 49 continues to light up, and when the operation stop time comes, the LED 46 changes to a long-cycle flashing and performs the same operation as when the stop switch 47 is pressed, the LED 49 stops lighting (turns off), and the timer operation ends. Show what you did. If on the next day the timer is to start and stop the operation at the same time as programmed on the previous day, it is sufficient to press the timer operation switch 48. The LED 50 indicates that there is an abnormality in the hot air fan. When oil runs out, LED50
flashes and the buzzer 42 issues an alarm, indicating that there is a lack of oil. Furthermore, when water accumulates in the oil tank in excess of a specified amount, the LED 50 flashes to indicate an abnormality, and in this case, operation cannot be started. It also flashes when a misfire occurs due to the activation of a vibration extinguishing system. Furthermore, if there is a failure in a component such as a relay or an ignition error due to a disconnection of the ignition heater, the light will remain lit to indicate a device failure. 51 is a speed changeover switch for the convection fan. Next, a control device that executes the hot air fan control sequence described in the description of the operating section in FIG. 3 will be described with reference to FIG. 4. Figures 1 and 3 in Figure 4.
The same symbols as in the figure are equivalents. In the figure, 200 is a microcomputer (μ-p). Here, μ-p200 will be explained. FIG. 14 is a block diagram showing the configuration of μ-p200. With reference to FIG. 14, the functions of μ-p and the outline of the data processing process will be explained. The first function is a logic operation function, which includes a logic operation unit (ALU) 201, an accumulator (ACC) 202, a temporary register (TEMP) 203, a program status flag (PS) 204, a carry flag 205, Zero Flag 206, Two's Complement (T/
C) 207 and 4-bit A and B buses for data transfer. ALU
Reference numeral 201 is a logic operation unit that can perform logical AND, logical OR, exclusive OR, and addition. The T/C 207 calculates the two's complement of the data transferred to the ALU 201, so the ALU 201 can perform subtraction. PS204, CF205, and ZF206 are 1-bit flip-flops for storing the system state. PS208 is a flag that is set and reset by instructions, and CF2
05 and ZF 206 are set and reset based on the calculation result of ALU 201 depending on the presence or absence of a carrier, and the ZF 206 is set and reset depending on whether the calculation result of CF 205 is zero or not, and is used for various determinations in program execution. ACC202 and TEMP203 are 4-bit registers, which are used to temporarily store ALU input data, calculation results, etc. The second function is a data storage function. This function is performed by RAM 209, X register 210, and Y register 211, which are variable memories.
The address of the RAM 209 is specified by the X and Y registers 210 and 211, and
The contents of the RAM 209 can be transferred to the ACC 202 and the like. The third function is a program storage and execution function that stores and executes programs. This function includes a fixed memory ROM210, a program counter PC204, a subroutine stack STACK211, and a stack pointer SP212.
Executed by The ROM 210 stores a program written in 8-bit instruction words to be executed by the system, and the PC 204 configured with a binary counter specifies the address of the ROM 210. Therefore, as the PC 204 counts up, the program stored in the ROM 210 is executed word by word.
The STACK 211 stores the contents of the PC 204 in order to designate the address to return to from the subroutine when executing the subroutine of the program. SP is used to specify the address to return to when executing a subroutine at two levels. The fourth function is an instruction decoding function. This feature is available in the instruction register IR
213, instructions are executed by programmable logic array I-PLA 214;
The IR 213 is an 8-bit register for latching the 8-bit instruction word transferred from the ROM 210 while the instruction is being executed. I-PLA2
14 performs the function of converting the 8-bit command word transferred from the ROM 210 into a control signal. Therefore, the 8-bit command word stored in the ROM 210 by the I-PLA 214 sequentially becomes various control signals and is used for other purposes. each functional part (e.g. ALU, ACC,
RAM... etc.), μ-p is sent to ROM210
It operates based on the program stored in the. The fifth function is a counter function. Counter 215 is an 8-bit binary counter,
It is set and reset by the counter flip-flop E/DFF 216. E/DFF21
When the counter 215 is enabled to count by 6, it counts up the pulse input from the _S1 input terminal, and when it counts up to the most significant bit (MSB), the set flag SF217 is set. Therefore, the E/DFF 216 is set and reset by the command from the ROM 210, and the SF
By checking whether 217 is set, the number of pulses from the _S1 input can be counted. Furthermore, the contents of the counter 215 can be divided into the upper 4 bits and the lower 4 bits and transferred directly to the ACC 202 or the like. Sixth is the input/output function. The input terminals include 4-bit parallel input terminals _A0 to _A3 and 4-bit parallel input terminals _B0 to _B3 . These two sets of parallel inputs A ₀ to _{A 3} and B ₀ to _{B 3} can be selectively transferred to the ACC 202 or the like via the B bus 219 by the multiplexer MPX 218 . The A ₀ to _{A 3} and B ₀ to B ₃ inputs are used for inputting data. Other input terminals include S ₀ and S ₁ input terminals.
This input terminal is convenient for counting pulse signals and performing interrupt operations independently of the μ-P clock. A comparator C220 determines whether the _S0 input is high or low. The _S1 input is connected to counter 2 by gate G221.
15 or directly to the synchronization circuit S222.
is input to SF217 through comparator C223.
S is a terminal that can be used in the same way as the ₀ input. S ₁ input to counter 21
5 can be selected by inputting the CS terminal. The RST input terminal is used when the power is first turned on, etc.
The program stored in the ROM 210 is stopped at the start (address 0) until the μ-P power supply is established, and can be used for purposes such as preventing malfunctions. At this time, all output terminals become L ₀ . The OSC input terminal is a terminal to which a capacitor and a resistor are connected in order to determine the oscillation frequency of the built-in oscillator 224. The μ-P operation is executed using the oscillation frequency of this oscillator as the clock, and this μ
- The operating speed (processing speed) of P is determined. Further, V _SS and V _DD are power supply terminals. Next, there are three types of output terminals. The first output terminal is a D output terminal consisting of _D0 to _D7 . The data in RAM 209 or ACC 202 and PS 208 are latched by latch 205, resulting in programmable logic array PLA 22.
When the data (5 bits) is transferred to 8 output terminals _D0 to D7 as 5-bit data, it is output as parallel 8-bit output to the 8 output terminals D0 to _D7 . Therefore, these output terminals D ₀ to D ₇ are suitable for display on an asegment display tube. The second output terminal is an E output terminal consisting of E ₀ to _{E 3} and can output 4-bit data in parallel from the ACC 202 or ROM 210. 2
27 is a latch. The third output is a C output terminal consisting of C ₀ -C ₁₁ , each of which can be independently set or reset. That is, Y register 2
11 specifies which C output is to be set and issues an output command, the corresponding C output terminal is latched by the latch 229 and output by the decoder 228. Therefore, various loads can be controlled with this C output terminal. Note that 230, 231, and 232 are multiplexers, and 233 is a comparator. The functions and data processing process of the .mu.-P shown in FIG. 14 have been outlined above, and the present invention shows an embodiment using such a .mu.-P. The embodiment shown in FIG. 4 is a control device constructed using the μ-P200 as described above. In the figure, the input terminal A ₀ of μ-P200,
A ₁ , A ₂ , and A ₃ form a switch matrix with output terminals C ₀ , C ₁ , C ₂ , and C ₃ . A manual operation switch 45, a stop switch 47, number keys 35, 36, 37, 38, etc. are connected to the intersections of the respective matrices. The switches 52 and 53 are an oil-out detection switch and a water-pool detection switch that detects water accumulated in the oil tank due to dew condensation or the like, respectively. These switches turn on when the oil (kerosene) runs out or when a certain amount of water accumulates in the oil tank. The output terminals C ₀ , C ₁ , C ₂ , and C ₃ are so-called scan outputs, which are output terminals that are sequentially turned on and off according to a program as shown in the flowchart shown in FIG. That is, in FIG. 7, when initial processing such as power-on processing is executed in block 54, the scan output terminal is designated as _C0 in block 55, and _C0 is turned on and Hi in block 56. Block 57,
At 58 and 59, various data are input, data is stored, arithmetic processed, etc., and outputted to various output terminals. After executing the main routine up to this point, block 60 turns off the C ₀ output _.
Then, in block 61, it is determined whether the output terminals have finished outputting sequentially up to C _3. If the output terminals have not output up to C ₃ , in block 62, the terminal to be output is set as the next output terminal, and the process goes to block 56. Return. When the output terminal reaches _C3 , the process returns to block 55 and the scan output terminal starts from _C0 . As described above, by executing the program, the outputs of _C0 to _C3 are sequentially outputted so as not to overlap with each other in time, as shown in FIG. 8A to D. The outputs of C ₀ -C ₃ dynamically drive the grid of fluorescent display tube 33, respectively, as shown in FIG. That is, C ₀ drives the first digit grid, C ₁ drives the second digit, C ₂ drives the colon grid and the third digit, and C ₃ drives the fourth digit grid. The eight output terminals D ₀ to _{D 7} are connected to the anodes of the seven segments of the fluorescent display tube 33, and the seven output terminals _{D 0} to _{D 6} are connected to the anode of the colon. ing. Therefore D ₀ ~ _{D 7} output and C ₀
The time is displayed by the scan output of ~ _C3 .
LED46, 49, 50, 40, 41, 43 are
switch means 63, 64, 65, 66, respectively;
67, 68, the output C ₈ of μ-P200,
It is driven by C ₉ , C ₁₀ , C ₁₁ , E ₀ , and E ₁ in the lighting method described above. In the buzzer 42, when the output _E2 is output, the oscillator 69 oscillates, thereby issuing a predetermined alarm or the like. As mentioned above, the scan output also constitutes a switch matrix such as the manual operation switch 45, and has a total of 16 outputs using the 4-bit input terminals _A0 to _A3.
It is designed to determine whether an independent switch is on or off. Scan output C ₀ as Hi and μ
- When P200 inputs input terminals A ₀ to _{A 3} as input data, switches 45, 48, 47, 39
This is data that can be used to determine whether or not the button has been pressed. That is, if the switch 45 is pressed, the 4-bit input of A ₀ to _{A 3} at that time is [0001] (A ₀ is the LSB), so the switch 45 is pressed.
It determines that has been pressed and executes the next specified program. In other words, μ-P200 has an output of
Set C ₄ and C ₅ to Hi and relay drive circuit 70, 7
1 to drive relays 72 and 73. At this time, contacts 72a of relays 72 and 73,
72b and 73a are turned on (opposite to the diagram), and the pump 9, ignition heater 8, and burner fan motor 11 are turned on.
is driven and ignition operation begins. At this time, as described above, the output terminal C ₈ that drives the LED 46 that displays the operating status also outputs HiL ₀ repeatedly, and the LED 46 blinks in short cycles. This is designed to be shorter than the blinking period during extinguishing, in order to distinguish between extinguishing and burning. When the burner temperature becomes high and the burner thermoswitch 7a is turned on, the convection fan 4 is driven and hot air is discharged. 51 is convection fan 4
This is a HiL ₀ switch. At this time, μ−P2
At 00, a signal indicating that the thermo switch 7a has been turned on is sent via the detector 74 to the input terminal _B0 . Therefore, μ-P200 converts C ₅ to L ₀
to turn off the relay 73, turn off the ignition heater 8, and switch the _C8 output from the HiL ₀ repeating state to the Hi state to indicate the combustion state. During combustion, a signal from the suction temperature detector 15 that detects the suction temperature is input from the analog-to-digital converter 75 to the inputs B ₁ and B ₂ of the μ-P 200 . In other words, μ depends on the input data to B ₁ and B ₂
-P200 changes the state of the outputs C ₆ and C ₇ and controls the solenoid 16 via the damper solenoid drive circuit 76 so that the temperature of the intake air, that is, the room temperature, becomes a set temperature (variable). It is something to do. When the stop switch 47 is pressed, the scan output
When C ₀ is Hi, the input data of A ₀ to _{A 3} is [0100]
becomes. Therefore, μ-P200 sets _C4 to _L0 to turn off relay 73. Yotsute pump 9
is turned off and oil delivery is stopped. While the burner part temperature is high, the thermo switch 7a
remains on, the convection fan 4 and burner fan 11 continue to operate. Furthermore, data indicating that the burner thermoswitch 7a is on is input to the _B0 input terminal of the μ-P 200 via the detector 74. Therefore, the μ-P200 will not operate until the burner thermoswitch 7a is turned off.
Output C ₄ so that LED 46 flashes in a long cycle.
Repeats HiL ₀ to indicate that the fire is being extinguished. When thermo switch 7a turns off (burner temperature drops sufficiently), μ-P200 keeps C ₈ at L ₀ .
LED 46 goes out. It is possible to determine which of the numeric keys 35, 36, 37, and 38 has been pressed based on the input data of _A0 to _A3 when the scan output _C1 is Hi. For example, when the input data is [0100], it can be determined that the key 36 has been pressed. The same applies to the scan output _C2 . Data A ₀ , A ₁ when scan output C ₅ is Hi
(lower 2 bits) is a switch input that is turned on and off by signals from drive circuits 70 and 71 of relays 72 and 73. For example, when C ₄ and C ₅ outputs are Hi, and A ₀ and A ₁ are Hi, For example, this is input data for determining that the relay circuit is at fault. This is to ensure safety, as if the relays 72 and 73 fail, the pump or ignition heater may remain on, creating a danger. It is composed of In addition, the upper 2 bits _A2 and _A3 input data are input by switches that detect the presence or absence of oil or water, respectively, and are used to issue alarms or stop operation by detecting the presence or absence of oil or water. do. Reference numeral 77 is a power synchronization circuit that turns on and off in synchronization with the power frequency (50Hz, 60Hz), and sends a power synchronization signal such as B to the _S0 input terminal in response to the power waveform shown in FIG. 11A. This signal causes μ-P200
counts time. 78 is a frequency selection switch between 50Hz and 60Hz. In other words, when the input to S ₁ is Hi, it is for 60Hz, and when 60 pulses are input to S ₀ , it counts as 1 second, and when it is L ₀ , 50 pulses counts as 1 second. This is the frequency switching input. Next, the safety circuit 79 will be explained. The safety circuit 79 receives inputs from the scan outputs C ₀ and C ₂ and supplies signals to the drive circuit 70 of the relay 72 . This is configured to stop the signal supply to the drive circuit 70 of the relay 72 when the μ-P200 no longer executes the regular program as shown in FIG. 7 due to some abnormality. If the _C4 output remains Hi (relay 72 is on) and μ-P200 becomes abnormal, relay 72 remains on.
2 is for preventing it from turning on. In other words, the μ-P200 has malfunctioned,
Scan output when normal program execution is stopped
Since C ₀ , C ₁ , C ₂ , and C ₃ are stopped, the safety circuit 79 is no longer supplied with repeated inputs from C ₀ and C ₂ . Therefore, the safety circuit 79 is provided with an AC coupling means (a capacitor, a transformer, etc.),
If the AC output is used to supply a signal (or power) to the relay circuit 70, the μ-P200
If an abnormality occurs and the program is no longer executed correctly, the oil pump 9 and ignition heater 8 of the warm air fan will not turn on no matter what happens. Since failures in parts other than the μ-P200, such as the relay circuits 70 and 71, are detected by the μ-P200 as described above, the safety of the entire control device can be established, resulting in an extremely safe control device. FIG. 5 is a more detailed embodiment of FIG. 4. In FIG. 5, the same symbols as in FIG. 4 are equivalents. In FIG. 5, a current fuse 80, a temperature fuse 81, a safety thermoswitch 82, and a vibration extinguishing switch 83 are inserted as shown to ensure safety. The power supply of the control device is lowered in voltage by a transformer 84, and V _CC1 , -V _CC , and V _SS are formed by a bridge rectifier 85 a, transistors 86 and 87, and Zener diodes 88 and 89, and a rectifier 85 b.
This forms V _CC2 . Also, A _C1 , A _C2
forms a heater power source for the fluorescent display tube 33, and a Zener diode 90 maintains the potential of the cathode at a desired value. Grids g ₁ to _{g 5} of the fluorescent display tube 33 are μ-P2
It is connected to the scan outputs C ₀ to C ₃ of 00, and is connected to -V by pulldown resistors 91a to 91d.
Connected to _CC . Further, anodes a to g and colon anodes Col of each segment are connected to outputs D ₀ to D ₇ and connected to -V _CC by pull-down resistors, respectively. As a result, the fluorescent display tube 33 is dynamically driven by the outputs D ₀ -D ₇ and the scan outputs C ₀ -C ₃ to display the time. The oscillator 69 is an IC such as LM555CN, and is configured to drive the buzzer 42, and the _E2 output is
When it becomes Hi, the buzzer 42 is driven at a predetermined frequency. LED46,49,50,40,41,43
through transistors 63 to 68, C ₈ ,
Driven by C ₉ , C ₁₀ , C ₁₁ , E ₀ , E ₁ outputs. The inputs A ₀ to A ₃ and the scan outputs C ₀ to _{C 3} form a switch matrix as shown in the figure, and each intersection is connected to a switch or a key as described above via a diode. There is. The rotary switch 34 is also constructed as shown in the figure, and has a similar construction in which an independent switch is provided at each intersection. However, since the function switch (switch for clock adjustment, ignition time setting, extinguishing time setting, and notification time setting) is configured as one rotary switch, only one function switch can be turned on at a time. This is an effective method because it is extremely easy to understand and easy to use. The C ₄ and C ₅ outputs drive transistors 70 and 71 which drive relays 72 and 73, respectively. The collector outputs of transistors 70 and 71 are
It is configured to drive transistors 94 and 95 via transistors 92 and 93,
μ-P20 input data for determining whether or not the collector output corresponds to the C ₄ and C ₅ outputs.
It is entered as 0. The base of transistor 70 is connected to the _C4 output via resistor 96, to the -V _CC power supply via resistor 97, and to the output from safety circuit 79 via resistor 98. ing. In the safety circuit 79, a transistor 99 is driven by scan outputs C ₀ and C ₂ . That is, as shown in FIG. 8E, a current is supplied to the base of the transistor 99. Therefore, the collector-emitter voltage V _CE of transistor 99 is
The voltage and currents V _C and I _C of the capacitor 100 become as shown in FIG. The AC output obtained by the capacitor 100 is rectified and smoothed by the diode 101 and the capacitor 102 to form a DC power source. If the scan output ceases to be a repeated pulse as shown in Figure 8 (E) (μ-P200 no longer operates according to the normal program)
In this case, the above-mentioned DC output will not come out. Resistor 97 only connects transistor 70 when both the C ₄ output and the DC output of safety circuit 79 are supplied between resistors 98 and 96.
The resistance value relationship is selected so that it can drive. Therefore, even if the _C4 output is Hi, the transistor 70 will not turn on unless the μ-P200 program is executed normally, so the μ-P2
When an abnormality occurs in 00, the pump 9 and the ignition heater 8 do not operate, ensuring safety. The suction temperature detector 15 is a thermistor and constitutes one side of the bridge together with the temperature setting variable resistor 102. Comparators 75a, 75b
are provided with different reference values, and input is from a temperature detection circuit comprising the thermistor, resistor, variable resistor, etc. That is, the difference between the temperature set by the variable resistor 102 and the temperature detected by the thermistor 15 is ΔT ₁
When ΔT ₂ (ΔT ₁ <ΔT ₂ ), the output of comparator 75a becomes Hi.
The outputs of 5a and 75b are set to Hi. Therefore, B ₁ , B ₂ to μ-P200
The input is the difference between the set temperature T _S and the detected temperature Td = T _S
- When Td is 0 to ΔT ₁ , B ₁ = B ₂ = 0, ΔT ₁ to Δ
When T ₂ , B ₁ = 1, B ₂ = 0, when ΔT ₂ or more, B ₁ =
1, B ₂ =1. i.e.

[Table] becomes. Therefore, the μ-P 200 outputs C ₆ and C ₇ based on the input data of B ₁ and B ₂ so that the combustion amount q as shown in FIG. 10 is obtained for ΔT. That is, when C ₇ is set to Hi and C ₆ is set to L ₀ , the transistor 76b is turned on and the solenoid winding 2 is turned on.
4b is excited, q becomes qmax, and C ₇ = C ₆ = L ₀
When q = qmed, C ₇ = L ₀ and C ₆ = Hi,
q=qmin. Therefore, μ-P200 is

As shown in [Table], C ₆ and C ₇ can be output for B ₁ and B ₂ data. Comparators 75a and 75b are resistors 103,
Hysteresis is provided by 104, and Δ
In reality, q changes as shown in FIG. 10 as T changes. Therefore, the suction temperature (room temperature) is automatically controlled to the set value, and since the combustion amount is controlled in multiple stages rather than simply turning it on and off, the hot air temperature swing is small and the experience is good. Can be controlled. 74a and 74b are photocouplers, and when the burner thermoswitch 7a is turned on, an input signal as shown in FIG. 11B is input to the _B0 terminal. Therefore, μ-P200 is thermo switch 7
It is determined that a is on. When the frequency selector switch 78 is on, the _S1 input is
It becomes Hi and is for 60Hz, and the time counting process of μ-P200 is the pulse input to the _S0 input (the first
Due to the processing method in which the waveform (same waveform as in Figure 1B) is 60 pulses and 1 second, conversely, when the frequency selection switch 78 is off, the Si input becomes L ₀ , which is for 50Hz. The power synchronization input signal to the S ₀ input is supplied from the collector of transistor 77 as shown. Further, a power outage prohibition circuit 105 and a capacitor 106 are connected to the RST terminal of the μ-P200. When the power is turned on, the capacitor 106 has μ-P
The capacitor 200 is a capacitor for preventing malfunction, and a prohibition circuit 105 is provided to prevent malfunction when a short power outage occurs. In the circuit for obtaining the power supply V _SS in FIG. 5, a capacitor 107 is connected to the collector of a transistor 86 and connected to V _CC1 via a diode 87. This means that μ−
This is to maintain the memory in the RAM of the P200. For this reason, only the μ-P200 and the minimum necessary load are connected to the power supply V _SS , and the stored charge in the capacitor 107 maintains the memory contents of the RAM in the event of a momentary power outage. I have to. However, when the capacitor 107 is discharged and V _SS no longer has a normal value, the μ-P 200 malfunctions when the power supply is restored (restarting from a power failure). In other words, the contents of RAM become abnormal and normal programs cannot be executed. Figure 13A shows the voltage V _C 10 of the capacitor 107.
7, but if a power outage occurs at t=t ₀ , V _C 107 will discharge as shown in the figure, and will remain above V _SS until t=t ₁ , so μ will rise as shown in FIG. -The power supply V _SS of P200 is maintained normally. Therefore, if there is an instantaneous power outage from t= _t0 to t= _t1 , the .mu.-P200 will maintain normal RAM contents due to the accumulated charges in the capacitor 107, and will operate normally even after the power outage is restored. However, capacitor 10 of reset terminal RST
6 is discharged together with V _SS , so if the power outage is restored during the time until V _SS reaches the reset voltage V _reset , that is, from t= _t1 to t= _t2 , as shown in FIG. , the RAM contents of μ-P200 remain abnormal, V _SS is restored, and μ-P200 no longer operates normally. Therefore, as shown in FIG. 13C, if a prohibition circuit is provided so that the voltage V _C 106 of the capacitor 106 becomes 0 at t= _t1 , the μ-P200 can suppress the RAM contents to a certain extent (for example, 0.5 It is possible to maintain normal operation (seconds) and to completely reset in the event of a longer power outage, thereby preventing abnormal program execution of the μ-P200. FIG. 12 shows one embodiment of the prohibition circuit 105. On power-up, the comparator reference signal is higher than the input signal (ie, capacitor 108 is connected to the input terminal), so the output of comparator 109 is L ₀ and resistors 110 and 111 turn on transistor 112. Therefore, the capacitor 108 is connected to the resistor 11
It is charged to a voltage determined by 3,114,115. Since both inputs of comparator 109 are connected as shown by diodes 116 and 117, the comparator remains at its output at L ₀ . Since transistor 112 is on, transistor 118 is turned off, capacitor 106 is charged, and the RST terminal is released from reset after a certain period of time has passed and V _SS is established. Assuming that t=t ₁ in FIG. 13 is reached, V _SS begins to decrease as shown in FIG. capacitor 10
8 and the discharge time constant of resistor 115 are appropriately selected, the input of comparator 109 will be inverted from its previous state when V _SS drops. Therefore, the output of the comparator becomes Hi, and the transistor 112 is turned off. Therefore, transistor 118 is turned on by resistor 119 and capacitor 106 discharges through resistor 120 (low resistance). and capacitor 108
is discharged through resistor 115, but resistor 121,
Until the potential of capacitor 108 drops to the potential determined by 122, the output of comparator 109 is
Keep Hi. This time (prohibition time) may be made longer than at least the time during which the capacitor 106 is discharged through the resistor 120. By providing such a prohibition circuit to the RST terminal of the μ-P200, the RAM of the μ-P200 can be prevented from repeatedly turning on and off or momentary power outages that may occur when connecting the hot air fan's power outlet to the power source. It is possible to prevent a program from being executed with abnormal contents, making it possible to provide an extremely safe control device. Effects of the Invention As described above, the hot air fan control device of the present invention has an inhibit circuit that stops the power supply from the commercial power source and simultaneously stops the execution of the program when the capacitor voltage falls below a certain level.
The operation of the control unit with the memory unit can be made reliable and safe against power outages such as instantaneous power outages of commercial power, and as a result, the operation to obtain a comfortable heating feeling with the hot air fan is extremely simple. ,
The hot air fan can be made extremely easy to use.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a hot air fan showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a burner section of the hot air fan, and FIG.
The figure is a configuration diagram of the hot air fan operating section, Figure 4 is a circuit block diagram of the warm air fan, Figure 5 is a specific circuit diagram of the hot air fan, and Figure 6 is a circuit diagram of the hot air fan.
The figure is a block diagram of the damper and solenoid in the hot air fan, Figure 7 is a program flowchart explaining the present invention, Figure 8 is a waveform diagram of various parts explaining the present invention, Figure 9 is a burner combustion characteristic diagram, and Figure 9 is a diagram of burner combustion characteristics. Fig. 10 is an explanatory diagram of the combustion control method, Fig. 11 is an explanatory diagram of the power synchronization input waveform, Fig. 12 is a circuit diagram of one embodiment of the power outage prohibition circuit, and Fig. 13 is for explaining the operation of the power outage prohibition circuit. 14 is a block diagram of a microcomputer, and FIG. 15 is a control circuit diagram of a conventional hot air fan. 34...Function switch, 35-38
...Number key, 39...Clear switch, 42...
...Buzzer, 45...Manual operation switch, 47...
Operation stop switch, 48...Timer operation switch, 40, 41, 43, 46, 49...Light emitting diode (display means).

Claims (1)

[Claims] 1 A first storage unit that stores a program for controlling combustion, a control unit that performs combustion control according to this program, and a control unit that is driven by this control unit and operates at least at a preset time. The control unit includes a timer device to start the operation, and a commercial power source and an auxiliary power source that supply power to the control unit, and the control unit stores the operation start time set in the timer device and causes the operation to start at the stored time. The auxiliary power supply is configured with at least two capacitors, and the auxiliary power supply is configured to stop supplying power from the commercial power supply when the capacitor voltage falls below a certain level. A control device for a warm air fan, which is provided with a prohibition circuit that simultaneously stops execution of the program.