JPS589337B2 - Warm-up body warmer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a defrosting operation control circuit that switches and controls heating operation and defrosting operation of an air conditioner.

This is the conventional defrosting operation control circuit of this type. This is based on a timer that emits an on/off signal of an appropriate length of time, and the resistance value of a thermistor fixed to the fin surface of the heat exchanger on the heat source side. Temperature change detection circuits that emit on/off signals are both connected to the input terminals of the AND circuit, and defrosting is performed only when both the timer and temperature change detection circuit (hereinafter referred to as thermo circuit) are emitting on signals. There was something that made me drive.

Such a control circuit limits the operating time and frequency of defrosting operation. Just in case. It was possible to control the start and stop of defrosting operation without reducing the heating effect.

however. What are the timers used in conventional control circuits? When the air conditioner stops operating. It is like a motor timer that keeps and stores the elapsed time of the on or off state until the time the operation is stopped, so if the timer is stopped in the on state, the outside air is cold and the thermistor is below a certain value. If exposed to temperature, both the timer and thermo circuit will issue an on signal when operation resumes.

As a result, the operation became a defrosting operation, and there was an inconvenience that cold air was blown into the room even though the air conditioner was restarted in need of heating.

Also, in conventional control circuits. Defrosting operation is always performed when both the timer and thermo circuit issue ON signals. When two or more ON signals generated by the thermo circuit are present within the generation time of one signal of the timer.
This results in switching between heating operation and defrosting operation more than once within the time that the timer generates one short ON signal.
There is a problem in that as the frequency of operation of the combustor motor and the circuit switching valve increases, the heating effect is excessively reduced.

The present invention can be used as a timer for a defrosting operation control circuit. When the air conditioner stops operating. By using a clock that returns to zero to the clock starting state during off-time, it is possible to control the air conditioner so that it always performs heating operation when it resumes operation. The present invention, which aims to provide a defrosting operation control circuit capable of preventing excessively short periodic switching between heating operation and defrosting operation, will be explained based on FIGS. 1 to 5 showing embodiments. It is as follows.

FIG. 1 shows a circuit A that constitutes a part of the defrosting operation control circuit according to the present invention (hereinafter referred to as the circuit B of the present invention).
A pulse oscillation circuit P that oscillates pulses at fixed time intervals determined by a circuit time constant. A timer Ti is constructed by combining the pulse oscillation circuit P with a counting circuit C consisting of a plurality of flip-flops FI, F2...Fo connected in series. Thermistor Th and Schmitt circuit S.

A conventionally known thermo circuit T consisting of: It is also connected to the input terminal of the AND circuit L.

In the embodiment, a second timer Ti is provided with a pulse oscillation circuit P using an oscillation transistor Q connected in feedback to the output terminal of the counting circuit C.
The circuit configuration shown in the figure is used.

Next, to explain the circuit operation of the circuit A, first, when the operating power of the air conditioner is turned on, the power of the circuit A is turned on. The pulse oscillation circuit P starts oscillating pulses, and the flipflops F1, F2, .

The transistor Q is feedback-connected to the flip-flop Fn at the final stage of the counting circuit C.

When Q is off (or on), transistor Q
is in a non-conductive (or conductive) state, so the pulse oscillation circuit P operates at an equal time interval t1 (which is determined in proportion to the sum of resistance values [R1+vR+R2] (or the product of the sum of resistance values and the capacitance of K).
or t2), pulse oscillation is performed every time.

On the other hand, flip-flops F1, F2...Fn perform binary counting. When the number of pulse oscillations reaches 20-1, the flip-flop Fn changes its on/off state, so the timer Ti starts with an off signal that lasts for (2n-1 x t1) time and continues for a shorter time (2n - lxt2). The ON signal and the OFF signal are alternately generated.

Also, if the operating power of the air conditioner is once cut off, regardless of whether the timer Ti is on or off. Since the flip-flops FI, F2...Fo all return to the OFF state, the timer Ti always returns (
It emits an off signal that lasts for 2n-l×11) time.

Therefore, at this time, the AND circuit L is . Thermo circuit T.

Always, regardless of whether it is on or off. At least (2
This results in an off signal that lasts for n-1×t1) time.

the result. By using circuit A, it is possible to prevent the above-mentioned inconvenience of cold air being blown in when the air conditioner restarts operation.

and. The on signal periodically generated by timer Ti is A
If the input is to the ND circuit L, the thermo circuit T
.

When inputting an ON signal to AND circuit L, AND circuit L issues an ON signal.

Then timer T1 or thermo circuit T.

When one of the ON signals ends, the AND circuit L issues an OFF signal.

Note that in the above explanation, the timer Ti was constructed using one each of the pulse oscillation circuit P and the counting circuit C. It goes without saying that the timer Ti can be configured using two combinations of a pulse oscillation circuit and a counting circuit.

Kuima T with such a configuration.

When using this, there is an advantage that the time length of the ON signal of the timer Ti can be adjusted independently.

Next, circuit B of the present invention will be explained.

Circuit B of the present invention comprises the circuit A described above. Its configuration is shown in Figure 3. Timer Ti of circuit A is passed through differential circuit D. Also thermo circuit T.

Directly connect the IAND circuit N.

Of the two NAND circuits N1 and N2 that are connected to the input terminal of the RS flip-flop X and constitute the RS flip-flop X. Either one. For example, connect the output terminal of the AND circuit L of circuit A to the input terminal of the second NAND circuit N1, and
The said INAND circuit N is connected to the input terminal of the circuit N2.

The output terminal of the third NAND circuit is connected to the third NAND circuit N.
The output terminal of No. 2 is connected to the switching circuit Sw.

Here, the switching circuit Sw performs a defrosting operation when the third NAND circuit N2 issues an on signal, and performs a heating operation when it issues an off signal. The combustor motor and circuit switching valve are controlled to perform the respective operations.

The operation of circuit B of the present invention is shown in FIG. 4 below by timer Ti and thermocircuit T.

The explanation will be made according to the changes in the on/off state.

Please note that the explanation is below. Its heading number {1). r2-1)
... [5-2) corresponds to the various numbers shown in FIG. 4.

In addition, the on/off state of each component circuit is expressed as 1 and 0, respectively. It is equipped with Since timer Ti always outputs O. AND circuit L: output 0 Differential circuit D = output O th INAND circuit N.

: Output 1 (input from differential circuit D is O) Therefore, regardless of the state before power is turned on, the output of RS flip-flop X is always 0 and heating operation is started.

(2) A case where the timer Ti is continuously outputting O, and [2-1] Thermo circuit T.

When the output changes from O to i, AND circuit L: Output 0 → 0 (input from timer T1 is O) Differential circuit D: output 0 → O (input from timer Ti remains unchanged) INAND circuit No.: Output l →1 (input from differentiation circuit D is 0) Therefore, second NAND circuit N1 and third NAND circuit N2
The input signal to is. Thermo circuit T.

remains unchanged before and after the output changes.

Therefore, the output of the RS flip-flop X is the thermo circuit T.

The state before the output change, that is, 0, is maintained and continued.

the result. Heating operation continues.

[3) A case where the timer Ti output changes from O to 1, and C3-1) Thermo circuit T.

When the output is O, AND circuit L: Output O → 0 (Thermo Circuit T.

input from 0) Differential circuit D: Output O → 1 (timer Input from T1 is O → 1) 1st INAND circuit N.

: Output 1 → 1 (Sir 7 circuit T.

Since the input from NAND is 0), the second NAND circuit N1 and the third
The input signal to the NAND circuit N2 remains unchanged for m after the output change of the timer Ti.

Therefore, the output of the flipflop X continues to maintain the state before the change in the output of the timer Ti, that is, 0.

As a result, heating operation continues.

C3-2] Thermo circuit T.

When the output is 1, AND circuit L: Output O → 1 (both inputs becomes 1) Differentiator circuit D: Instantaneous output 0 → 1 → 0 Pulse change (input from timer Ti) (force changes from 0 to 1) 1st INAND circuit N.

: Due to the instantaneous pulse-like change of output 1 → 0 → l. The output of the RS flipflop X, which was O before the output change of the timer Tc, is transferred to the second NAND circuit N1 and the third NAND circuit N1.
NAND circuit. It changes to 1 at the moment when the input signal to N2 becomes 1 and 0, respectively. Heating operation switches to defrosting operation.

Right after that. Instantly, the second NAND circuit N1. 3rd NAND
Even if the input signals to the circuit N2 both become 1, the output of the RS flip-flop X remains at 1, and the defrosting operation continues.

(4) When timer Ti is continuously outputting 1, and . [4-1] Sir 7 circuit T.

When the output changes from O to 1 AND circuit L: Output 0 → 1 (both inputs becomes 1) Differentiator circuit D: Output 0 → O (timer (Input from Ti remains unchanged) 1st INAND circuit N.

: Output 1 → 1 (input from differential circuit D is 0) By the way, thermo circuit T.

Before the output changes, the AND circuit L and the INAN
D circuit N.

Since the outputs of RS flipflop X are 0 and 1, respectively, the output of RS flipflop X is O.

Therefore, Sir 7 circuit T.

The output changes and the second NAND circuit N1 and third NAND
Even if the input signals to the circuit N2 both become 1, the output of the RS flip-flop X remains 0, and the heating operation continues.

C4-2) When the circuit Tc output changes from 1 to 0 AND circuit: Output l → 0 (sir 7 times Road T.

The input from l → 0) Differentiator circuit D: Output 0 → 0 (timer (Input from Ti remains unchanged) 1st INAND No.: Output l → 1 (differential input from the circuit is 0) Thermo circuit T.

Before the output changes, the output of the RS flipflop X can take O or 1.

However, the thermo circuit T.

The output changes and the second NAND circuit N1 and third NAND
The output of the RS flipflop X whose input signals to the circuit N2 are 0 and 1, respectively, is always 0.

Therefore, if heating operation was being performed, it will continue as it is, and if defrosting operation is being performed, it will be switched to heating operation. [5] In the case where the timer Ti output changes from 1 to O, and [5] -1) Sir7 circuit T.

When the output is 0, AND circuit L: Output 0 → 0 (Thermo Circuit T.

Differential circuit D: Output O → 0 (timer Manpower from Ti reverse change from 1 to 0) 1st INAND circuit N.

: Output 1 → 1 (thermo circuit T.

Since the input from NAND is 0), the second NAND circuit N1 and the third
The input signal to the NAND circuit N2 remains unchanged before and after the change in the output of the timer Ti.

Therefore, the output of the RS flip-flop X remains at 0, and the heating operation continues.

C5-2) Sir 7 circuit T.

When the output is 1, AND circuit L: Output 1 → 0 (timer Input from Ti is l → 0) Differentiator circuit D: Output 0 → 0 (timer Input from Ti is a reverse change from 1 to 0) 1st INAND circuit N.

: Output 1 → 1 (input from differentiation circuit D is 0) Third NAND circuit N2 before timer Ti output changes
The output of can increase by O or 1.

However, the timer Ti output changes and the second NAND circuit N1
and the input signals to the third NAND circuit N2 are 0 and I, respectively.
QIn this case, the output of the RS flip-flop X will always be O.

Therefore, if heating operation was being performed, it continues as is, and if defrosting operation was being performed, it is switched to heating operation.

Note that FIG. 5 shows a specific example of the circuit configuration of the circuit B of the present invention.

As detailed above, the circuit B of the present invention is. Circuit A in that circuit
Because it is equipped with The output of the AND circuit L can always be set to 0 when the air conditioner starts or restarts operation. Thermo circuit T.

The output of the RS flip-flop X can be maintained at 0 regardless of whether it is on or off, and the operation of the air conditioner can always be started from heating operation.

Not only that, but also as shown in C4-1 above. Invention circuit B
is the thermo circuit T if the timer T1 is already in the on state.

The defrosting operation is not performed even if the unit issues an on signal.

Due to this. Thermo circuit T.

If two or more ON signals (b, c in Figure 4) generated by timer Ti are present within the generation time of the ON signal (a in Figure 4) of timer Ti. The thermo circuit T has already been generated before the on signal of the timer Ti is issued.

Switching to defrosting operation is performed only when the ON signal (b in Figure 4) is detected. Regarding the subsequent ON signal (C in FIG. 4), switching to defrosting operation can be prevented.

Therefore, switching between heating operation and defrosting operation occurs in an excessively short period. Since switching between heating operation and defrosting operation is not performed more than once within the short ON signal generation time of timer Ti, circuit B of the present invention reduces the operating frequency of the combustor motor and the four-way switching valve. With. This can prevent the heating effect from being excessively reduced.

In addition, the other points are exactly the same as the conventional defrosting operation control circuit. Needless to say, it is possible to control the start and stop of defrosting operation.

Therefore, the circuit of the present invention performs ideal defrosting operation control of the air conditioner in all cases.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a block diagram of circuit A forming a part of circuit B of the present invention, FIG. 2 is a circuit diagram of timer Ti, and FIG. 3 is a block diagram of circuit B of the present invention. The block diagram of FIG. 4 shows the timer Ti and thermo circuit T. Fig. 5 is an electronic circuit diagram showing a specific example of the circuit configuration of the circuit B of the present invention. It is. C...Counting circuit, D...Differentiating circuit, F,, F2...Fn...
...Fritub Flotub. K...Capacitor. L...AND
Circuit, No, Nl, N2...NAND circuit. P...Pulse oscillation circuit, Q...Transistor. So... Schmitt circuit. SW...Switching circuit, To...Thermo circuit. Th...Thermistor, Ti...Timer. X...RS Fritzbu Frotub.

Claims (1)

[Claims] 1 A circuit is constructed in which a timer that issues an on/off signal of an appropriate length of time and a temperature change detection circuit that issues an on/off signal in response to temperature changes on the surface of the heat exchanger on the heat source side are connected to the input terminal of an AND circuit. , the timer is configured by a combination of a pulse oscillation circuit that oscillates pulses at fixed time intervals, and a counting circuit consisting of a plurality of flip-flops connected in series to the pulse oscillation circuit; The timer. The previous temperature change detection circuit is connected directly to the input terminal of the second INAND circuit through the differentiating circuit, and also to the input terminal of the second NAND circuit of one of the two NAND circuits forming the RS flip-flop. The above AND to the terminal
The output terminal of the circuit is connected to the input terminal of the other third NAND circuit, and the output terminal of the front INAND circuit is connected to the input terminal of the other third NAND circuit. A defrosting operation control circuit for an air conditioner, characterized in that the defrosting operation is controlled to start and stop based on an on/off signal output from a third NAND circuit.