JP2001248916A - Power interruption detector for hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compact an apparatus by decreasing the number of parts at a control circuit section thereby decreasing the mounting area of a control board. SOLUTION: Input signal of an operation switch 35 is stored in a memory IC 38 and when power supply to a control circuit section 29 is recovered from interruption, a microcomputer 33 reads out input signal information stored in the memory IC 38 and controls the control circuit section 29 by judging the operating conditions of an apparatus before power interruption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a power failure of a warm air heater.

[0002]

2. Description of the Related Art A conventional hot air heater has a display indicating that a power failure has been recovered when the power is restored due to a power failure during operation, or when the power cord is unplugged and re-inserted during operation. Is blinking, and the blower fan is controlled to rotate. This is to prevent the hot air heater from becoming temporarily high in temperature due to combustion heat when the blower fan stops due to a power failure.

[0003] For this purpose, a voltage holding circuit is incorporated in the control circuit section, so that even if the power is turned off during operation, the fact that the equipment is operating is held for a certain period of time by the voltage, and the microcomputer is activated when the power failure is restored. After confirming the voltage, the blower fan was rotated.

[0004] The configuration will be described below with reference to the drawings.

FIG. 7 is a sectional view showing the overall structure of a conventional hot air heater.

In FIG. 7, air A introduced from a filter 1 on the rear side is warmed through a passage B between a combustion burner 2 and a combustion case 3 and guided by a blower fan 4 and is again delivered as warm air C into a living room. The combustion chamber 5 including the combustion burner 2 and the combustion case 3 blocks the hot air from the combustion burner 2 and suppresses the temperature rise of the outer case 6 and the resin 7 of the display unit.

[0007] A temperature sensor 8 is attached to the combustion chamber 5 to monitor abnormal heating of the combustion burner 2. A microcomputer (hereinafter referred to as a microcomputer) 10 of the control circuit unit 9 controls drive circuits such as the combustion burner 2 and the blower fan 4 and operates a user's operation switch 11.
Of the key input signal is recognized. The operation status of the device is displayed on the display unit 13. If a power failure occurs or the power outlet is disconnected during operation of the device, the microcomputer 10 detects that the power supply has dropped, stops the gas supplied to the combustion burner 2, and stops the device in a safe state. As the combustion of the equipment stops and the rotation of the blower fan 4 stops, the temperature of the combustion chamber 5 rises temporarily. The temperature of the combustion chamber 5 is transmitted to the outer case 6 of the device, and the temperature of the entire device increases.

For this reason, the control circuit section 9 is provided with a power failure detection circuit 14 for holding the power supply. If a short-time power failure occurs during operation, the blower fan 2 is rotated for a certain period of time after the power recovery to cool the hot air. (Power failure recovery mode).

FIG. 8 is a circuit diagram showing details of the control circuit section 9. The household power supply 15 includes a transformer 16 and an AC / DC converter 1.
7, the voltage becomes a smoothed voltage on the secondary side (DC 12 V power supply is common). This voltage passes through the limiting resistor 18 and the reverse voltage preventing diode 19 and is charged in the capacitor 20 for holding the power supply.

The voltage charged in the power holding capacitor 20 is gradually discharged via the discharge resistor 21 when the supply is stopped due to a power failure of the home power supply 15 or the like (D in the figure). When the household power supply 15 is supplied again, the voltage E remaining in the power supply holding capacitor 20 and the resistors 22 and 23
The reference voltage F generated in the step (1) is compared by the voltage comparison part 24 and a signal is sent to the microcomputer 10.

The voltage E remaining in the power holding capacitor 20
Is higher than the reference voltage F, a Hi signal is output, and the microcomputer 10 is informed that the device was operating before the power failure. The microcomputer 10 shifts to the power failure recovery mode from the operation of the device and lowers the temperature of the device by the rotation of the blower fan 2. In addition, the display of the recovery from the power failure (for example, “0
("0" blinks) to notify the user.

The capacitors 25, 26, and 27 are provided for noise removal and function so that the power failure detection circuit removes external noise and operates normally.

[0013]

However, according to the conventional power failure detection device, the number of components (about ten and several points) of the control circuit section is large, and it becomes an obstacle to downsizing the device due to the reduction of the mounting area of the control board. Had issues. Further, the voltage holding capacitor of the control circuit has a problem that it is difficult to maintain stable performance over time considering the life of the capacitor. An object of the present invention is to provide a power failure detection device for a hot air heater that is stable over time while reducing the number of components.

[0014]

In order to solve the above-mentioned problems, a control circuit for receiving an input signal from an operation switch, controlling a drive circuit and displaying an operation state, controls the control circuit in a sequence programmed in advance. The microcomputer comprises a microcomputer to be controlled, and a storage means for storing information of an input signal from the operation switch, which can be read and written at any time. Thereby, the input signal of the operation switch is stored in the storage unit, and the microcomputer reads out the input signal information stored in the storage unit when the power supply to the control circuit unit recovers from the power failure, and reads out the input signal information of the device before the power failure. The operation state is determined and the control circuit is controlled.

According to the above-mentioned invention, the power failure detection device having about ten and several points can be replaced with the storage means and becomes possible with only a few points including the peripheral circuit, so that the control board area can be greatly reduced. This can contribute to the downsizing of the entire device. The storage means is, for example, 10
It is possible to read and write more than 100,000 times, and it becomes a component with very high reliability compared to the capacitor with the aging, and it is possible to provide a stable product.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a combustion burner that burns gas, a blower fan that takes in air and sends out the combustion heat of the combustion burner, and controls combustion of the combustion burner and rotation of the blower fan. A drive circuit unit for driving, and a control circuit unit for receiving an input signal from an operation switch to control the drive circuit unit and display an operation state, wherein the control circuit unit is a control circuit unit in a previously programmed sequence. A microcomputer for controlling the operation of the operation switch, and a read / write storage unit for storing information of an input signal from the operation switch. The input signal information stored in the storage means is read.

Thus, the input signal of the operation switch is stored in the storage means, and the microcomputer reads out the input signal information stored in the storage means when the power supplied to the control circuit unit recovers from the power failure. Since the control circuit is controlled by judging the operation state of the device, the number of components can be reduced to only a few, and the control board area can be greatly reduced, which contributes to the downsizing of the entire device. The storage means is, for example, 100 for a memory IC or the like.
It can be read and written more than ten thousand times, and it becomes a very reliable part compared to a capacitor with the aging, so that stable products can be provided.

According to a second aspect of the present invention, the information on the input signal of the operation switch stored in the storage means is obtained by inputting the input signal of the operation switch to a microcomputer and outputting the operation data output from the microcomputer.

Thus, the input signal of the operation switch is input to the microcomputer, and the operation data output from the microcomputer is stored in the storage means, so that data obtained by performing noise removal processing by the microcomputer is obtained, and Reliability can be increased. Also, the contents stored in the storage means and the operation contents of the microcomputer do not differ due to noise or the like, and the reliability of the warm air heater can be increased.

According to a third aspect of the present invention, the microcomputer controls the control circuit section in a sequence programmed in advance in response to an input signal from the combustion determination means for detecting and determining the combustion heat state of the combustion burner after the recovery from the power failure. To control.

With this configuration, it is possible to determine whether or not it is necessary to cool the device by driving a blower fan, for example, based on the combustion heat state of the combustion burner after the power is restored. Does not drive the fan. For example, when the operation is stopped by unplugging the power outlet without turning off the operation switch, it is possible to avoid the trouble of rotating the blower fan when plugging into the power outlet and using the next time.

According to a fourth aspect of the present invention, the microcomputer controls the control circuit unit in a sequence programmed in advance in response to an input signal from the timer reservation operation selection determining means for determining whether or not the timer reservation operation is performed after the recovery from the power failure. Is what you do.

Thus, during the timer reservation operation, it is possible to notify the user that the timer reservation operation has been canceled due to a power failure regardless of, for example, the combustion heat state of the combustion burner.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) The overall configuration of a hot air heater according to Embodiment 1 of the present invention is the same as that of the conventional example shown in FIG.

FIG. 1 is a detailed configuration diagram of the control circuit unit 29 of the hot air heater of the first embodiment. The DC power from the home power supply 30 via the transformer 31 and the AC / DC converter 32 to the secondary side is supplied to the microcomputer 33 (in most cases, DC5).
V). The microcomputer 33 recognizes the user's intention from the input signal from the operation switch 35 and the room temperature setting signal provided on the display unit 34, rotates the blower fan by the FM drive circuit 36, and controls the combustion by the combustion burner drive circuit 37.

In the control circuit section 29, a memory IC 38 as a storage means is connected to the microcomputer 33. The memory IC 38 is the same semiconductor with a built-in memory chip as the microcomputer 33, but the microcomputer 33 can only process according to the program written in advance, whereas the memory IC 38 can read and write information at any time when given a signal and can store the information. There are features.

In addition, since it is non-volatile, its stored contents can be taken out even if the power is once turned off. In recent years, it has been widely used to memorize a stop due to a failure of a device and to contribute to improvement of service. Here, the explanation has been made using an IC, but any semiconductor memory may be used.

Next, the operation and the operation will be described. The input signal from the operation switch 35 is transmitted to the microcomputer 33 and also to the memory IC 38, where the operating state of the equipment such as the start of operation of the equipment is stored. Even if a power failure occurs and the equipment stops, the next time the power is restored, the microcomputer 3
3 recognizes that a power failure has occurred during operation by reading the operation information of the device stored in the memory IC 38, shifts to a power failure recovery mode, rotates the blower fan, and cools the device.

As described above, according to the first embodiment of the present invention,
The input signal of the operation switch is stored in the storage unit, and the microcomputer reads the input signal information stored in the storage unit when the power supply to the control circuit unit recovers from the power failure, and displays the operation state of the device before the power failure. Since the control circuit is controlled based on the judgment, the number of parts can be reduced to just a few points.
The control board area can be greatly reduced, contributing to the downsizing of the entire device.

The storage means, for example, a memory IC or the like can be read and written more than 1 million times, so that it becomes a component having a very high reliability compared to a capacitor with the aging, and a stable product can be provided.

(Embodiment 2) FIG. 2 is a detailed block diagram of a control circuit section according to Embodiment 2 of the present invention. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

In the figure, the difference from the first embodiment is that the input signal from the operation switch 35 of the device is not sent from the operation switch 35 of the display unit 34 to the memory IC 38 but the input signal of the operation switch is input to the microcomputer 33. Then, the operation data subjected to the noise removal processing or the like by the microcomputer 33 is sent to the memory IC 38 for storage.

Next, the operation and the operation will be described. The input signal from the operation switch 35 of the apparatus contains many buzz-shaped noises called bounces. To take out the ON / OFF signal of the operation switch 35 from among them, a highly reliable reading determination sequence and a noise removal filter are required.

The microcomputer 33 instantaneously reads the signal level from the operation switch 35 twice, for example, in order to determine the ON signal of the operation switch, and decides when the two read values match. If it is noise, it is not determined because the two read values do not match. The signal of the operation switch is determined using such a twice coincidence detection method or the like. The operation switch data (operation data) determined by the microcomputer 33 is several bits, and is transmitted from the microcomputer 33 to the memory IC 38 as one-bit data per one clock by clock-synchronized serial communication. At this time, a signal for error detection or correction may be included.

Since these measures have been taken, the memory IC based on the operation data determined by the microcomputer 33
Since the memory 38 can be stored, a highly reliable configuration against noise can be realized.

As described above, according to the second embodiment of the present invention,
Since the input signal of the operation switch is input to the microcomputer and the operation data output from the microcomputer is stored in the storage means, data subjected to noise removal processing by the microcomputer can be obtained, and the reliability of the warm air heater can be improved. Further, since the contents stored in the storage means always coincide with the operation contents of the microcomputer, the reliability of the hot air heater can be improved without discrepancies due to noise or the like.

(Embodiment 3) FIG. 3 is a detailed block diagram of a control circuit unit according to Embodiment 3 of the present invention. The components having the same reference numerals as those in the first and second embodiments have the same structure, and the description will be omitted.

In the drawing, the difference from the first and second embodiments is that a combustion determination means 45 for detecting and determining the combustion heat state of the combustion burner is provided, and a signal of the combustion heat state is input to the microcomputer 33. For example, a temperature state signal from a temperature sensor that detects the temperature of the combustion chamber is input to the combustion determination unit 45.

FIG. 4 is an operation sequence diagram of the third embodiment of the present invention. After the microcomputer recovers from the power failure,
After reading the stored information of No. 8 and judging that the operation switch 35 of the device is turned on, the combustion judging means 45 judges the combustion state of the combustion burner (S1). When it is determined that the equipment needs to be cooled, for example, when the temperature of the combustion chamber is high, the drive of the blower fan is turned on, and a power failure recovery mode display (for example, "00" blinks) is notified to the user (S2). If the cooling of the device is unnecessary, the cooling fan is not driven and the power failure recovery mode is not displayed, and the process shifts to a standby mode in which the operation switch of the device is waited for (S3).

As described above, if the temperature of the combustion chamber is high at the time of recovery from the power failure, it is necessary to shift to the power failure recovery mode S2 and rotate the blower fan to cool the equipment. If so, the temperature of the combustion chamber is low, and the process directly shifts to the standby mode S3.

As described above, according to the third embodiment of the present invention,
Depending on the combustion heat state of the combustion burner after the power is restored, for example, it is possible to determine whether or not it is necessary to cool the device by driving the blower fan, so that it is possible to drive the blower fan when cooling is not necessary. Absent. For example, when the operation is stopped by unplugging the power outlet without turning off the operation switch, it is possible to avoid the trouble of rotating the blower fan when plugging into the power outlet and using the next time.

(Embodiment 4) FIG. 5 is a detailed block diagram of a control circuit unit according to Embodiment 4 of the present invention. The components having the same reference numerals as those of the third embodiment have the same structure, and the description is omitted.

In the figure, the difference from the third embodiment is that a timer reservation operation selection judging means 46 for judging the presence / absence of timer reservation operation is provided, and a signal indicating the presence / absence of timer reservation operation is input to the microcomputer 33.

FIG. 6 is an operation sequence diagram of the fourth embodiment of the present invention. Compared with FIG. 4 which is an operation sequence diagram of the third embodiment, a timer reservation operation selection determination (S4) is provided between the combustion determination (S1) and the standby mode (S3).

In the case where the power is restored due to a power failure during the timer reservation operation, after the determination by the combustion determination means (S1), the mode shifts to the power failure recovery mode by the determination of the timer reservation operation selection determination (S4) and the blower fan is started. To rotate. in addition,
The display unit notifies the user of the recovery from power failure (for example, blinking “00”). Timer reservation operation selection judgment (S
Without 4), since the temperature of the combustion chamber is low, the standby mode (S3) is set and the user cannot be notified that a power failure has occurred.

In FIG. 6, when the timer reservation operation is selected in the timer reservation operation selection determination (S4), the display may be directly shifted to the power failure recovery mode display, or a display different from the recovery power failure mode (for example, The display indicating that there is a power failure during timer reservation) may be performed.

As described above, according to the fourth embodiment of the present invention,
During the timer reservation operation, it is possible to notify the user that the timer reservation operation has been canceled due to a power failure regardless of the combustion heat state of the combustion burner or the like.

[0049]

As described above, according to the apparatus for detecting a power failure of a warm air heater of the present invention, the input signal of the operation switch is stored in the storage means, and the microcomputer supplies power to the control circuit. The input signal information stored in the storage means is read out after the power outage, and the control circuit is controlled by judging the operation state of the equipment before the power outage. The area can be reduced, contributing to the downsizing of the entire device.

The storage means, for example, a memory IC or the like can be read and written more than one million times, and it becomes a part having a very high reliability compared to a capacitor with the aging, so that a stable product can be provided.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a control circuit unit of a power failure detection device of a hot air heater according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit unit of a power failure detection device for a hot air heater in Embodiment 2 of the present invention.

FIG. 3 is a block diagram of a control circuit unit of a power failure detection device for a hot air heater in a third embodiment of the present invention.

FIG. 4 is an operation sequence diagram of a microcomputer of the hot air heater.

FIG. 5 is a block diagram of a control circuit of a power failure detection device for a hot air heater in a fourth embodiment of the present invention.

FIG. 6 is an operation sequence diagram of a microcomputer of the hot air heater.

FIG. 7 is a cross-sectional view showing the overall configuration of a conventional hot air heater.

FIG. 8 is a control circuit diagram of a power failure detection device of the hot air heater.

[Explanation of symbols]

 2 Combustion burner 4 Blower fan 5 Combustion chamber 8 Temperature sensor 29 Control circuit unit 30 Household power supply 31 Transformer 32 AC / DC converter 33 Microcomputer 34 Display unit 35 Operation switch 36 FM drive circuit 37 Combustion burner drive circuit 38 Memory IC (Storage means) 45 Combustion judgment means 46 Timer reserved operation judgment means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuhiro Okada 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 3L028 EA01 EB04 EC04 ED04

Claims (4)

[Claims] 1. A combustion burner that burns gas, a blower fan that takes in air and sends out combustion heat of the combustion burner, a drive circuit unit that drives combustion of the combustion burner and rotation of the blower fan, and an operation switch. A control circuit unit that controls the drive circuit unit with an input signal to display an operation state, the control circuit unit controls the control circuit unit in a sequence programmed in advance, and a microcomputer that controls the operation switch. The microcomputer comprises a read / write storage means for storing information of the input signal, and the microcomputer reads out the input signal information stored in the storage means when power supplied to the control circuit unit returns from a power failure. Power failure detection device for wind heater. 2. The hot air heater according to claim 1, wherein the information of the operation switch input signal stored in the storage means is operation data output from the microcomputer by inputting the operation switch input signal to the microcomputer. Power failure detection device. 3. The microcomputer controls the control circuit in a sequence programmed in advance according to an input signal from combustion determination means for detecting and determining the combustion heat state of the combustion burner after recovery from the power failure. 2
The power failure detection device for a hot air heater according to the above. 4. The microcomputer controls the control circuit section in a sequence programmed in advance in response to an input signal from a timer reserved operation selection determining means for determining whether or not the timer reserved operation is performed after the recovery from the power failure.
The power failure detection device for a warm air heater according to any one of the above.