JPH0356024A - Electronic controller - Google Patents

Abstract

PURPOSE:To attain the multifunction of a control section by a method wherein the control section driving and controlling load according to a pulse generating section, load and the result of pulse timing is installed, the presence of the input of pulses within a fixed period is investigated in the control section, instantaneous service interruption is judged to occur when there is no input of pulses, and load is stopped. CONSTITUTION:A control section 1 conducts timing operation by inputting pulses based on the frequency of a commercial AC power 4 generated from a pulse generating section 2 and counting the pulses, and drives and controls load 5 according to a result at the time of timing. The control section 1 investigates the presence of the input of pulses within a fixed period, judges instantaneous service interruption to occur when there is no input of pulses within the fixed period, and stops the drive control of load 5. The backup time of the control section 1 at the time of instantaneous service interruption can be ensured sufficiently on the basis of the drive and stoppage of the load 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an electronic control device having a momentary power failure detection function.

(Example) Conventional technology In recent years, electronically controlled devices such as microwave ovens, washing machines, clothes dryers, and VTRs that are equipped with control units such as microcomputers and are electronically controlled have been widely put into practical use. There is.

In such an electronic control device, the control section is backed up with a capacitor or the like in the event of a momentary power outage so that the control contents in the control section are not erased undesirably in the event of a momentary power outage. ing.

At this time, if the load controlled by the control unit in addition to the control unit is also powered up, the guaranteed backup time of the control unit using capacitors, etc. becomes extremely short, and the control unit cannot be backed up for the entire period of the instantaneous power outage. There is a fear that it will not be possible.

Therefore, it is common practice to provide a momentary power failure detection circuit that outputs a predetermined signal to the U control unit when a momentary power failure occurs (
(See Japanese Patent Publication No. 1-15777). In this case, based on a predetermined signal output from the instantaneous power outage detection circuit when a momentary power outage occurs, the control unit reduces the load by M% so that the load is not backed up.

That is, driving of the load is stopped. Therefore, sufficient time can be secured for backing up the control unit in the event of a momentary power outage.

On the other hand, the above-mentioned control unit performs a timekeeping operation by inputting and counting pulses based on the dark wave number of the commercial AC power supply, and controls the drive of the load according to the timekeeping results.
*taking a certain amount.

Now, in the groove where the control section inputs the predetermined signal and frequency pulse outputted from the instantaneous power failure detection circuit when a momentary power outage occurs, the control section inputs the predetermined signal input terminal and the frequency pulse input terminal. Both are necessary and therefore
This will cause problems in securing terminals for other controls in the control unit.

(c) Problems to be Solved by the Invention The present invention aims to reduce the number of input terminals of the control unit necessary for both detection of instantaneous power outage and timing operation.

(2) Means for Solving the Problems The electronic control device of the present invention includes a pulse generator that generates pulses based on the frequency of a commercial AC power source, a load, and a pulse input from the pulse generator for counting. The controller comprises a control unit that performs a time measurement operation and controls the drive of the load according to the time measurement result, and the control unit includes a first means for checking whether or not the pulse is input within a predetermined period; When it is determined that there is no input of the above pulse within a predetermined period, it is determined that a momentary power outage has occurred.1. and a second means for stopping drive control of the upper load.

(e) The action control section performs a timekeeping operation by inputting and counting pulses based on the frequency of the commercial AC power source generated from the pulse generation section, and drives and controls the load in accordance with the timing results. Furthermore, the control unit checks whether or not the pulse is input within a predetermined period, and if the pulse is not input within the predetermined period, it determines that a momentary power outage has occurred, and stops the drive control of the load. . Based on this stoppage of the drive of the load, sufficient backup time for the control unit can be ensured in the event of a momentary power outage.

In this way, the control section performs both momentary power outage detection and timing operation based on the input of the commercial AC power frequency pulse. It is only necessary to provide terminals for inputting the 12 dark wave number pulses to both sides, and the number of terminals related to other controls can be increased.

(F) Embodiment FIG. 1 shows the circuit of an electronically controlled microwave oven according to an embodiment of the present invention, in which a control section 1 consisting of a microcomputer or the like is provided to control the microwave oven. The control unit 1 receives key operation information from the keyboard 2 and pulses from the pulse generator 3 . This pulse is based on the dark wave frequency of the commercial AC power source 4, for example 60 Hz, and is a 60 Hz pulse. Then, the control section 1 controls the relay 5, which is a load, and controls the drive of the magnetron 6, that is, the microwave heating, based on the key operation information and pulses.

Specifically, when a desired heating time is set using the keyboard 2 and a heating start operation is performed, the control section 1 inputs the desired heating time. Then, the L controller 1 counts the heating time using the built-in l-th counter C N T 1 based on the pulses from the pulse generator 3 . At the same time, the control section 1 of E indicates the magnetron 6.
to start microwave heating. And the above it
When the desired heating time is counted by the counter CNTI, the control section 1 stops driving the magnetron 6 and ends the microwave heating according to the result.

Now, the pulse from the pulse generator 3 is also used when detecting a momentary power outage.

FIG. 2 shows the program flow of the instantaneous power failure detection routine incorporated in the control section 1, and the operation related to instantaneous power failure detection will be explained below with reference to the figure.

First, while pulses based on the commercial power frequency are not generated from the pulse generator 3, the Sl. Each step of S2, S3, and S4 is repeatedly executed at high speed every time the instantaneous power failure detection routine is entered. In step S1, it is determined whether or not the pulse from the pulse generator 3 has been manually generated. S2
In the step, the crystal oscillator OS provided in the control unit l
Based on the signal from C, the second counter CN in the control unit l
At T2, it is determined whether 1,'32 seconds have elapsed while the time measurement of 1/32 seconds is repeatedly executed. Within such a period of 1/32 seconds, the pulse generator 3 to 60
Usually one Hz pulse (period: 1760 seconds) is generated.
In step S3, the instantaneous power failure flag in the control unit l is set to OFF-FL.
Whether or not G is set is determined at t'4. In step S4, drive control of the magnetron 6 is permitted.

When a 60Hz pulse is generated from the pulse generator 3, 51, S2, S3 . After the repeated execution of each step in S4 is completed, step S5 is executed. In step S5, the pulse flag PFLG in lillpal
As soon as the setting operation is completed, the instantaneous power failure flag turns OFF-F.
An LG reset operation is performed. After that, St, S again
Steps 2, S3, and 84 are repeatedly executed.

Subsequently, when 1/32 second is counted by the second counter CNT2, the repeated execution of steps Sl, 32, S3, and S4 is again completed, and step S6 is executed. S
In step 6, a 60 Hz pulse is generated from the pulse generator 3 during a predetermined period of 1/32 seconds, and it is determined whether or not the pulse flag PFLG is set.

In the present case, the S6 step corresponds to the first means of the present invention, and the pulse flag PFLG is set as described above.Therefore, the S7 step is then executed and the pulse flag PFLG is reset.

2, Sl. Each step of S2, S3, S4
In a situation where a is repeatedly executed, l,/”
3 60H from pulse generator 3 during a predetermined period of 2 seconds
It is sequentially checked whether the pulse of z is generated normally.

In this sequential investigation, when a momentary power outage occurred and the pulse generator 3 stopped generating 60Hz pulses, it was found that no 60Hz pulses were generated during the predetermined period of 1732 seconds. If you check, the S6 step will be reached and the S8 step will be executed. In step S8, at f when it is determined that a momentary power outage has occurred, all outputs of the control unit 1 are stopped and corrected, thereby stopping the M control of the relay 5 and stopping the microwave heating. Furthermore, instantaneous power failure 7 lag OFF-FLG is set. Such step S8 corresponds to the second means of the present invention. After that, S1, S2, S3
Each step of Sl. S2, S6.58, S7, S3
Each step is executed repeatedly.

Here, fslmm l is backed up by a capacitor (not shown) in the event of a momentary power outage, and this capacitor is connected to relay 5 controlled by control unit l''C'.
etc.! Since 1illI is stopped, it is not used for backing up the relay 5, etc., and therefore, sufficient backup time for the control unit 1 can be secured in the event of a momentary power outage. As can be seen from the above description, the control unit 1 performs both momentary power failure detection and timing operations based on the input of pulses from the pulse generation unit 3 related to the frequency of the commercial AC power supply. In this case, it is only necessary to provide the terminal 7 for inputting the above-mentioned pulses for both detection of instantaneous power outage and timing operation, and the number of terminals related to other controls can be increased.

．． Note: When the instantaneous power outage returns, the flow as explained at the beginning begins, and Sl. S2. In a situation where each step of S3 and S4 is repeatedly executed, it is successively checked that the pulse generator 3 normally generates a 60 Hz pulse during a predetermined period of I/32 seconds, and , S4
In the step, drive control of the magnetron 6 is allowed,
Such drive control is restarted.

(Effects of the Invention According to the present invention, the input terminals of the control unit necessary for both instantaneous power outage detection and timing operation can be shared, reducing the number of such terminals, and therefore reducing the number of input terminals in the control unit. The number of such terminals can be increased, and the control section can be multifunctional.

[Brief explanation of drawings]

The drawings relate to a microwave oven according to an embodiment of the present invention, with FIG. 1 being a circuit diagram and FIG. 2 being a flowchart of a program for an instantaneous power failure detection routine. 1...Control unit, 3...Pulse generation unit, 5゜゜゜Relay person Sanyo Electric Co., Ltd.

Claims (1)

[Claims] (1) A pulse generator that generates pulses based on the frequency of the commercial AC power supply, a load, performs timekeeping operation by inputting and counting the pulses from the pulse generator, and drives the load according to the timing results. The controller includes a first means for checking whether or not the pulse has been input within a predetermined period, and a first means for checking whether the pulse has been input within the predetermined period. and second means for determining that an instantaneous power outage has occurred and stopping drive control of the load.