JPH02183753A - Manual defrosting control device for air conditioner - Google Patents

Abstract

PURPOSE:To prevent the air conditioner from performing the defrosting opera tion every time the power switch is turned on even when a manual operation switch is left engaged by detecting with a detecting means the change in the switching condition of the manual operation switch after the power switch has been turned on, and outputting the detection signal. CONSTITUTION:The manual defrosting control device has a power switch 2, a manual operation switch 6, a detecting means 7 which outputs the detection signal upon detecting the change in the switching condition of the manual operation switch 6 after the power switch 2 has been turned on, and a processing means 4 which performs the defrosting operation in response to the detection signal. When the detecting means 7 detects a fact that the switching condition of the manual operation switch 6 has changed after the power switch 2 has been turned on, such detection signal is outputted. In response to said detection signal, the processing means 4 performs the defrosting operation. Meanwhile, the detecting means 7 does not output the detection signal even when the power switch 2 is turned on after the switching condition of the operation switch 6 has been changed, and so, the processing means 4 does not perform the defrosting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a manual defrosting control device for an air conditioner, and more specifically, a manual defrosting control device for an air conditioner that prevents malfunctions in defrosting operation. Regarding.

2. Description of the Related Art Conventionally, air conditioners have been equipped with a control device that automatically performs a defrosting operation to prevent a decrease in heating efficiency. In addition, the above control device is used for inspection and maintenance of defrosting operation.
It has a configuration that allows the defrosting operation to be performed manually.

An example of such a conventional technique is JP-A-61-116234. In this conventional example, a microcomputer built-in de-icer automatically defrosts depending on the frosting state, and defrosting operation 11: is entered manually by a forced defrosting operation command switch.

Problems to be Solved by the Invention In some cases, the forced defrosting operation command switch in the prior art uses a pair of jumper wire input terminals so that only maintenance personnel can operate the switch. In order to check the defrosting operation of the air conditioner, maintenance personnel of the air conditioner may forget to remove the jumper wire while keeping the input terminal electrically connected through the jumper wire. In this case, the problem arises that the air conditioner performs a defrosting operation every time the power is turned on, and normal heating operation is not performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manual defrosting control device for an air conditioner that allows normal heating operation even if a maintenance person makes a mistake in operating the air conditioner.

Means for Solving the Problems Claim 1 of the present invention provides a manual defrosting control device for defrosting a heat exchanger of an air conditioner, which includes: a power switch 2; a manual operation switch 6; and a power switch. 2 and the output of the manual operation switch 6, the manual operation switch 6 is turned on after the power switch 2 is turned on.
A manual defrosting device for an air conditioner, characterized in that it includes a detection means 7 that detects a change in the switching state of the air conditioner and outputs a detection signal, and a processing means 4 that performs a defrosting operation in response to the detection signal. It is a frost control device.

A second aspect of the present invention provides that the detection means 7 includes: a reversing means 71 that is energized by the output of the power switch 2 and reversing the output of the manual operation switch 6; and predetermining the output of the reversing means 71. means 72 for deriving a detection signal by performing a logical operation on the output of the manual operation switch 6 and the output of the holding means 76; When the operation switch 6 remains operated, the logic operation means 72 continues to give an output, which is a logical value from which no detection signal is derived, to the holding means 75; The detection signal is derived in a state where the manual operation switch 6 is being operated and an output is being given from the holding means 75 when the manual operation switch 6 is not being operated. This is a manual defrost control device for air conditioners.

Furthermore, claim 3 of the present invention provides that the detection means includes: first switching state detection means for detecting the switching state of the manual operation switch 6 when the power switch 2 is turned on; a second switching state detection means for detecting the switching state of the manual operation switch 6 when a predetermined period of time has elapsed; When the switching state after a predetermined period of time has passed, the detection signal is not derived, and when they do not match, a change in the switching state of the manually operated switch is detected, and when a change in the switching state occurs, the detection signal is 2. A manual defrosting control device for an air conditioner according to claim 1, further comprising detection signal generating means for deriving a detection signal.

According to the present invention, when the detection means 7 detects that the switching state of the manual operation switch 6 is changed after the power switch 2 is turned on, a detection signal is output. The processing means 4 performs a defrosting operation in response to this detection signal.On the other hand, even if the power switch 2 is turned on after the switching state of the operation switch 6 is changed, the detection means 7 does not output a detection signal. Therefore, the processing means 4 does not perform a defrosting operation.

According to claim 2 of the present invention, the reversing means 71:
When the manual operation switch 6 remains operated when the power switch 2 is turned on, the output, which is a logical value from which no detection signal is derived from the logical operation means 72, remains applied to the holding means 75, and therefore, when the power is turned on, the defrosting is stopped. No action is taken.

Further, when the manual operation switch is not operated after the power is turned on, the reversing means 71 derives a signal equivalent to the operation of the manual operation switch 6, and this equivalent signal is transmitted to the manual operation switch 6 by the holding means 75. It is retained for a predetermined period of time after the operation. Therefore, by operating the manual operation switch 6 after turning on the power, the logical operation means 72 performs the defrosting operation based on the output from the operation of the manual operation switch 6 and the equivalent signal held in the holding means 75. In the third aspect of the present invention, the detection signal is generated by using a detection signal generating means responsive to the output of the first switching state detecting means and the output of the second switching state detecting means. Start the defrosting operation. In other words, in the detection signal generating means, the manual t! the switching state of the operation switch 6;
When the switching states match the switching states after a predetermined time has elapsed, no detection signal is derived; when the switching states do not match, a change in the switching state of the manual operation switch 6 is detected, and a change is detected. When this happens, a detection signal is derived and the defrosting operation is started.

Embodiment FIG. 1 is a block diagram of a first embodiment of a manual defrosting control device for an air conditioner according to an embodiment of the present invention as set forth in claims 1 and 2. The commercial power 21iX1 is supplied to the power supply circuit 3 via the power switch 2. Commercial power supply 1 is
It is a 100■ or 200■ AC power supply. By turning on the power switch 2 with the on/off switch,
Supplies power to air conditioners. The power supply circuit 3 is a circuit that converts the AC voltage from the commercial electricity fAl into a low voltage and further rectifies it. The output of the power supply circuit 3 is given to a processing circuit 4 and a drive circuit 5, which are processing means, and is given to a manual operation switch 6. The manual operation switch 6 is realized by, for example, a jumper switch, that is, a pair of jumper terminals. 6a, 6b and a jumper wire 6c connecting them. The manual operation switch 6 makes the manual operation switch 6 conductive by winding the jumper wire 6c around the jumper terminals 6a and 6b.The electric signal derived from the manual operation switch 6 is connected to a monostable circuit which is a detection means. 7 is given.

The monostable circuit 7 is a circuit that outputs a high-level signal for a predetermined period from the rise of the input signal, and the output of the monostable circuit 7 is given to the processing circuit 4. The processing circuit 4 is
It receives a manual defrost control signal from the monostable circuit 7 and outputs a drive signal to the drive circuit 5 to start the defrost operation.

Further, the drive circuit 5 drives the output relay 8 to cause the air conditioner to start defrosting operation.

An input signal to the monostable circuit 7 is applied to one input of an inverting circuit 71 as an inverting means and an AND circuit 72 as a logic operation means via a signal line e1. A resistor 73 connected to the signal line 11 is connected to the manual operation switch 6
is in the cut-off state, the inverting circuit 71 and the AND circuit 7
The output of the 0 inverting circuit 71, which is a resistor provided to prevent one input of 2 from becoming open, is connected to the resistor 7.
4, and the output of the resistor 74 is connected to the capacitor 7
5 and the input of the AND circuit 72.

The curved end of the capacitor 75 is grounded, and the resistor 74 and capacitor 75 constitute an integrating circuit 76.

The circuit operation of this monostable circuit 7 will be explained below using the timing chart shown in FIG. FIG. 2 (1) shows the conduction/cutoff state of the power switch 2, FIG. 2 (2) shows the conduction/cutoff state of the manual operation switch 6, and FIG. The above signal waveform is shown in the same figure (4
) is the signal waveform on the signal line 12 which is the output of the integrating circuit 76 composed of the resistor 74 and the capacitor 75, and (5) in the figure is the signal waveform on the signal line 13 which is the output of the AND circuit 72.
The above signal waveforms are shown respectively.

As shown in FIG. 2, at time t. Assume that the manual operation switch 6 is turned on at time tel before the power switch 2 is turned on at step 2. At this time, driving power is not supplied to the inversion circuit 71, so its input terminal is at a low level, but its output terminal is also at a low level. Capacitor 75 is not charged. In this state, time to
When the power switch 2 is turned on at step 2, the line 11 switches to high level, but the inverting circuit 71's power goes to high level, and since the inverting circuit 71 is energized, its output continues to be at low level. Therefore, as shown in FIG. 2 (5), at time t. In 2, the detection signal is not output from the AND circuit 72. When the manual operation switch 6 is cut off at step 3, the input terminal of the inverting circuit 71 becomes low level, the output terminal becomes high level, and the capacitor 75 is charged.

As shown in FIG. 2 (2), at time t, the manual operation switch 6 is turned on, and at the same time, as shown in FIG. 2 (3), the potential on the signal line 11 becomes high level. As a result, the input signal level of the inverting circuit 71 also becomes high level. Therefore, the output of the inverting circuit 71 becomes a low level, and the charge stored in the capacitor 75 in the integrating circuit 76 is discharged via the resistor 74. Here, the resistance value of the resistor 74 is R, and the resistance value of the capacitor 7
The voltage when the output of the C1 inverting circuit 71 is at a high level is (■). . Then, the discharge curve W shown in FIG. 2 (4) is expressed by the first equation.

-''--V, =V. . -e llc ・ (1)
Letting the input threshold voltage of the AND circuit 72 be Vth,
Output voltage of the integrating circuit 76■. When satisfies the second equation, both inputs of the AND circuit 75 are determined to be logic "1" inputs, so logic "1" is output. therefore,
As shown in FIG. 2 (5), time 1. It also reaches a high level.

■I≦VC≦■. . , (2) The output voltage VC of the integrating circuit 76 is the input threshold voltage ■. If the value becomes lower and satisfies the third equation, the AND circuit 72 performs the logic “
0'' and outputs a low level at time t2 as shown in FIG. 2 (4).

0≦■. Ku■. (3) When the manual operation switch 6 is cut off at time t3, the signal line 11 becomes low level, and the signal level on the output 13 of the AND circuit 72 maintains the low level. In addition, when the potential on the signal line 11 becomes low level,
The output of the inverting circuit 71 becomes high level, and the output of the inverting circuit 71 becomes high level.
is charged, and the potential on signal line 12 increases.

Next, after the manual operation switch 6 is turned on, the integration circuit 7
In a state where the potential on 12, which is the output voltage of 6, does not become lower than the input threshold voltage V th of the AND circuit 72,
6 Describing the case where the manual operation switch 6 is cut off
At a certain time, when the manual operation switch 6 is turned on, the potential on the signal line 11 becomes high level at the same time.

As the potential on the signal line 11 becomes high level, the output voltage of the inverting circuit 71 becomes low level. Therefore, the integrating circuit 76 starts discharging and the potential on the signal line 12 decreases. Then, at time t, when the manual operation switch 6 is turned off, the potential on the signal line il becomes a low level, and the potential on the signal line 13, which is the output of the AND circuit 72, becomes a low level.

As described above, the sheep stabilizing circuit 7 accepts the operation of the manual operation switch 6 after the power switch 2 is turned on, and also receives the input fJ.
The detection signal is output for a period of time determined by the time constant of the dividing circuit 76 from the rise of the signal. Thereby, even if the manual operation switch 6 is always in a conductive state, it is possible to prevent the processing circuit 4 from constantly accepting a detection signal that is a defrosting operation command.

Next, the operation of the processing circuit 4 shown in FIG. 1 will be explained according to the flowchart shown in FIG. In step n1,
Power is turned on to the air conditioner.

In step n2, the processing circuit 4 is initialized. Initialization includes, for example, resetting a timer. When initialization is complete, step n
3, the timer starts counting. Then, in step n4, it is determined whether or not the timer has elapsed for 5 seconds. If 5 seconds have not elapsed, the timer continues counting in step n3. timer is 5
If seconds have elapsed, it is determined in step rr5 whether or not there is a manual defrosting input, and if there is a manual defrosting input, the process proceeds to step n6.

In step n6, the output relay 8 is connected to the drive circuit 5.
Provides a drive signal to turn on. A defrosting operation is started by applying a drive signal to the drive circuit 5, and it is determined in step r+7 whether or not the defrosting operation is completed. When defrosting is completed, the process proceeds to step n8, and a signal for turning off the output relay 8 is given to the drive circuit 5. When the defrosting operation is completed, the process returns to step n5.

If it is determined in step rm5 that there is no manual defrosting input, step rI9 is executed to perform normal heating operation.

FIG. 4 is a block diagram of a second embodiment of the present invention. In the first embodiment, the rise of the electrical signal from the manual operation switch 6 is captured using a monostable circuit 7, whereas in the second embodiment, the above operation is carried out by a program built in the processing circuit 14. Realize.

The commercial power supply 11 is connected to the power supply circuit 1 via the power switch 12.
given to 3. The power supply circuit 13 converts and rectifies the alternating current voltage of the commercial power supply 11, and its output is given to a processing circuit 14 and a drive circuit 15, and one manual operation switch 16 given to the manual operation switch 16,
For example, the manual operation switch 16, which is like a jumper switch and is composed of jumper terminals 16a, 16b and a jumper wire 16c, has a jumper wire 16c.
By winding the jumper terminals 16a and 16b,
It can be in a conductive state. The processing circuit 14 determines that the manual operation switch 16 is turned on, and provides a drive signal to the drive circuit 15 to start the defrosting operation. The drive circuit 15 current amplifies the drive signal and turns on the output relay 18.

The processing circuit 14 includes a first switching state detection means 14a that detects the switching state of the manual operation switch 16 when the power switch 2 is turned on, and a manual t! Operation switch 1
The second switching state detecting means 14b detects the switching state of No. 6, and the detection signal generating means 14c performs an operation as described later in response to each output of the first and second switching state detecting means 14a and 14b. It will be done.

Particularly, in the defrosting control device configured as described above, the operation of the processing circuit 14 is explained in accordance with the flowchart shown in FIG. 5.The power is turned on in step rn1, and initialization is performed in step m2. Initialization includes, for example, resetting a timer or resetting various flags. When the initialization is completed, the process proceeds to step m3, where the timer counts.

In step m4, the first switching state detection means 14a detects whether or not there is a manual defrosting input to the processing circuit 14. That is, it is determined whether the manual operation switch 16 is turned on.

When the manual operation switch 16 is turned on and a high level signal is input to the processing circuit 14, the flag H1 at the Stella 11 port 5 is set to logic "1". Further, if there is no manual defrosting input, that is, if the manual operation switch 16 is in the cutoff state, the flag H is set in step m6.
is set to logic "0".

In step m7, it is determined whether 5 seconds have elapsed since the power was turned on, and if 5 seconds have not elapsed, the process returns to step m3. In step rn7, if 5 seconds have elapsed on the timer, the process proceeds to step m8, where the second switching state detection means 14b determines whether the defrost input signal is at a high level. In step m8, if the defrosting input signal is at a high level, the process proceeds to step m9, where logic "1" is set as flag H2. And step m 1
0, the detection signal generating means 14c calculates the exclusive OR shown in Table 1 between the previous flag H and the golden flag H2.

Since step m9 and step rn10 in Table 1 are executed repeatedly, generally flag H7 is set in step m9.
is set to logic ``1'', and in step mlo, the exclusive OR of flags l-(, -1 and H is performed. Then, in step rn11, it is determined whether the result of the exclusive OR is 0 or not. Exclusive OR is performed using flag H as shown in Table 1.

If and flag H1 have the same logical value, a logical "0" is output, and if they have different logical values, a logical "1" is output.

In step rn11, if the result of the exclusive OR is logical "1", that is, the logical values of the previous flag and the current flag are different, it is determined that the manual operation switch 16 has been input, and step rn At 12, the defrosting operation starts. Furthermore, in step mll, if the result of the exclusive OR is logical "0", that is, if the previous flag and the current flag have the same logical value, it is determined that manual defrosting input has not been performed. and step r
Normal operation is performed at n13.

In step m8, if the defrost input signal is at a low level, it is determined that the manual defrost control signal is not input, and in step m14, the flag H7 is set to logic "0".
" is set. Then, in step m13, normal operation is performed.

As described above, in the second embodiment, since changes in the electrical signal from the manual operation switch 16 are processed by a program, the monostable circuit 7 as in the first embodiment is not required.
It is possible to reduce costs and make the processing device smaller and lighter.

Effects of the Invention As described above, according to the present invention, the detection means 7 detects that the switching state of the manual operation switch 6 is changed after the power switch 2 is turned on, and outputs a detection signal. Even if the manual operation switch 6 is left operated, the air conditioner is prevented from performing defrosting operation every time the power switch 2 is turned on.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the defrost control device for an air conditioner according to the present invention as set forth in claims 1 and 2, and FIG. monostable circuit 7
FIG. 3 is a flowchart for explaining the operation of the first embodiment,
FIG. 4 is a block diagram of a second embodiment of the present invention as defined in claim 3, and FIG. 5 is a flowchart for explaining the operation of the second embodiment shown in FIG. 2... Power switch, 4... Processing circuit, 5... Drive circuit, 6... Manual operation switch, 7... Monostable circuit, 8... Output relay, 12... Power switch, 14
... Processing circuit, 15 ... Drive circuit, 16 ... Manual operation switch, 18 ... Output relay agent Patent attorney Number of strokes Keiichi Part 1 Figure 6, Specification subject to amendment and Drawing 7, Contents of amendment Reprint of the specification and drawings (no changes to the contents) Procedures for writing amendments) % formula % 1. Indication of the case Patent application 1983-335652 2. Name of the invention Manual defrosting control device for air conditioning equipment 3. Amendment Relationship with the case of the applicant Applicant address name (285) Daikin Industries, Ltd. Representative 4, Agent

Claims (3)

[Claims] (1) In a manual defrost control device that defrosts a heat exchanger of an air conditioner, the power switch 2, the manual operation switch 6, and the output of the power switch 2 and the output of the manual operation switch 6 respond to the output of the power switch 2 and the manual operation switch 6. , after turning on the power switch 2, turn on the manual operation switch 6.
A manual defrosting device for an air conditioner, characterized in that it includes a detection means 7 that detects a change in the switching state of the air conditioner and outputs a detection signal, and a processing means 4 that performs a defrosting operation in response to the detection signal. Frost control device. (2) The detection means 7 is powered by the output of the power switch 2, and includes a reversing means 71 for reversing the output of the manual operation switch 6, and a means 76 for holding the output of the reversing means 71 for a predetermined period of time. and means 72 for logically calculating the output of the manual operation switch 6 and the output of the holding means 76 to derive a detection signal, and the reversing means 71 is configured to operate when the manual operation switch 6 is operated when the power switch 2 is turned on. When the logic operation means 72 remains unchanged, the output which is a logical value from which no detection signal is derived from the logic operation means 72 is kept given to the holding means 75, and the logic operation means 72 has the manual operation switch 6 operated, and furthermore, The manual defrosting of an air conditioner according to claim 1, characterized in that the detection signal is derived in a state where an output is given from the holding means 75 when the manual operation switch 6 is not operated. Control device. (3) The detection means includes first switching state detection means for detecting the switching state of the manual operation switch 6 when the power switch 2 is turned on, and manual operation when a predetermined time has elapsed after the power switch 2 was turned on. a second switching state detection means for detecting the switching state of the switch 6; and a switching state at the time of power-on and a switching state after the elapse of the predetermined time in response to the outputs of the first and second switching state detection means. Detection signal generation that does not derive the detection signal when they match, detects a change in the switching state of the manually operated switch when they do not match, and derives the detection signal when a change in the switching state occurs. 2. A manual defrosting control device for an air conditioner according to claim 1, further comprising means.