JPH0886498A - Controller for air conditioner - Google Patents

Abstract

PURPOSE: To provide a controller for an air conditioner in which a fan and valve can be controlled by one control signal, the fan and the valve are connected to a power source by two lines and a wiring operation can be simplified without an erroneous wiring. CONSTITUTION: During operation of a fan 22 and a valve 23, a phase angle control circuit controls the turning-on state of a TRIAC 25 based on the output of a senor circuit 5. During stop of the fan 22 and the valve 23, power is fed through a power feed circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner controller for controlling the operation of air conditioners.

[0002]

2. Description of the Related Art Conventionally, a control device for an air conditioner of a simple plant such as a general household, an agricultural house, or a food processing device is shown in FIG.
It is configured as shown in. In FIG. 2, 21 is an AC power supply, 22 is a fan for blowing air, 23 is a valve for heating or cooling or humidifying, 24 is a control device main body, 25 is a triac for phase angle control, 26 is a relay contact, 27 is a relay contact.
Is a control circuit including a sensor that detects the state of the atmosphere.

In the conventional device configured as described above, the rotational speed of the fan 22 and the valve are controlled by controlling the triac 25 and the relay contact 26 in accordance with the atmospheric condition detected by the sensor incorporated in the control circuit 27. Two
The opening / closing of 3 is controlled to operate so as to maintain the atmospheric state in a predetermined state.

[0004]

Since the conventional control device for an air conditioner is constructed as described above, the control circuit 27
It is necessary to output a fan control signal and a valve control signal, respectively, and a control line for the fan 22 and a control line for the valve 23 must be separately provided. As described above, since it is necessary to connect two control lines to the conventional control device in addition to the power supply line of the control circuit 27, for example, the fan 22 and the valve 2 are connected.
When the distance between the installation place of No. 3 and the installation place of the control device main body 24 is long, there is a problem that the man-hours for wiring and the wiring construction cost increase significantly. Further, the control device body 24
Since it is necessary to connect four lines to, there is a risk that the control device may be damaged by incorrect wiring.

The present invention has been made in order to solve the above problems, and it is possible to control a fan and a valve at the same time by a single control signal. It is an object of the present invention to provide a control device for an air conditioner that can be connected by two lines and thus can prevent wiring from becoming erroneous and simplify wiring work.

[0006]

A control device for an air conditioner according to the present invention includes a phase angle control means for controlling a phase angle of a switching means for controlling supply of electric power to a load according to an output of the sensor circuit, a sensor circuit, and A voltage generating means and a rectifying means for supplying electric power to the phase angle control means are provided.

[0007]

In the controller of the air conditioner according to the present invention, the sensor circuit determines the driving timing of the fan and the valve and the phase angle of the fan, and the timer circuit which receives the determination result determines the valve and the fan at all phase angles for a certain period of time. After driving, the valve and fan are driven simultaneously with the phase angle determined by the sensor circuit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is an AC power source, 22 is a fan for blowing air, and 23 is a valve for heating. The fan 22 and the valve 23 that constitute an air conditioner (heater in this embodiment) are as shown in the figure. Are connected in parallel. Here, when the air conditioner is a cooler, the valve 23 is a cooling valve, and when the humidity controller is a valve, the valve 23 is a humidifying valve.

Reference numerals 1 and 2 are terminals for connection, 3 is a bidirectional voltage drop circuit as a voltage generating means constituted by connecting a plurality of diodes in antiparallel, and 25 is a fan 22 and a valve 2.
3 is a triac as a switching means for controlling the phase angle of the power supply to 3, and 4 are diodes D1 and D2.
And a voltage doubler rectifier circuit including capacitors C1 and C2. Here, the resistor R and the diodes D3 and D4 are
The power supply path is connected to the voltage doubler rectifier circuit 4 without passing through the triac 25, and the resistance value of the resistor R is such that the currents flowing through the power supply path are connected in parallel to each other to form an air conditioner. The values are selected so that the fan 22 and the valve 23 are not operated.

Reference numeral 5 denotes a sensor circuit for detecting the temperature, which includes a thermistor R _PV , a temperature setting variable resistor R _SP , a dead zone setting resistor R _D , and comparators COM1 and COM2.

Reference numeral 6 denotes a timer circuit, which is a light emitting diode 6
1a, 62a, 63a, AND circuit 64, capacitor 6
5, a comparator COM3, and resistors 70 to 72. Reference numeral 7 denotes a phase angle control means, which is a diac 66 for triggering the triac 25 when the inter-terminal voltage of the capacitor 67 reaches a predetermined voltage, charging resistors r1 to r3 for charging the capacitor 67, and a light emitting diode 61.
a, 62a, 63a and transistors 61b, 62b, 63b forming a photocoupler.

Here, the resistance value of the charging resistor r3 is selected so that the triac 25 is in the on state (full conduction) for the entire period when the transistor 63b is turned on. Further, the resistance value of the charging resistor r1 is selected such that the conduction period of the triac 25 becomes a conduction period in which the open state of the valve 23 can be maintained when the transistor 61b is turned on.

Next, the operation of this embodiment configured as described above will be described. In the following description, the case where the temperature of the atmosphere gradually decreases from the temperature equal to or higher than the set temperature will be described.

First, when the temperature of the atmosphere is higher than the set temperature, the outputs of the comparators COM1 and COM2 are both at "H" level, and the output of the AND circuit 64 is also at "H" level. No current flows through the light emitting diodes 61a to 63a, and the transistors 61b to 63b are in the off state. In this state, the capacitor 67 is not charged, so the triac 25 remains off (conduction angle 0 °) for the entire period, and the fan 22 and the valve 23 remain stopped. In this state, the capacitors C1,
The charging state of C2 is maintained by the power supply path of the resistor R and the diodes D3 and D4. Therefore, the sensor circuit 5 and the timer circuit 6 can continue to operate by the voltage across the terminals of the capacitors C1 and C2.

Next, when the temperature of the atmosphere falls and falls below the set temperature, the output of the comparator COM1 becomes "L" level, the output of the AND circuit 64 becomes "L" level, and the output of the comparator COM3 becomes "L". It becomes the L "level. Therefore, the light emitting diodes 61a and 63a emit light to turn on the transistors 61b and 63b,
Triac 25 is on for the entire period (full conduction)
become. When the triac 25 is turned on, the valve 23
Changes from the closed state to the open state, and the fan 22 rotates at high speed to start heating. The period in which the triac 25 is in the full conduction state is predetermined by the timer circuit. That is, when a certain time elapses after the output of the AND circuit 64 becomes "L" level, the capacitor 65 is charged by the resistor 70 and the comparator C
The output of the OM3 is inverted from "L" level to "H" level, the light emitting diode 63a is turned off, and the transistor 63b is turned off.
Turns off.

Thereafter, the triac 25 is turned on only for a period determined by the value of the charging resistance r1. In this state, the valve 23 remains open and the fan 22 rotates at a low speed. Further, when the fan 22 and the valve 23 are in the operating state, an AC voltage is generated across the bidirectional voltage drop circuit 3. The AC voltage is rectified by the voltage doubler rectifier circuit 4 and then supplied to the sensor circuit 5 and the timer circuit 6.

Even if the temperature of the atmosphere falls below the set temperature, if the temperature is within the dead zone defined by the resistor R _D , the above state is maintained.

When the temperature of the atmosphere further decreases and exceeds the range of the dead zone, the output of the comparator COM2 becomes the "L" level, the light emitting diode 62a is turned on, and the transistor 62b is turned on. When this happens,
Since both the transistors 61b and 62b are in the ON state, the capacitor 67 is charged by the charging resistors r1 and r2. Therefore, the period during which the triac 25 is in the conductive state becomes longer than when only the transistor 61b is in the on state. Therefore, the valve 23 can be maintained in the open state and the fan 22 rotates at a high speed, so that the heating capacity of the air conditioner increases.

As described above, according to this embodiment,
The fan and the valve can be controlled by one control signal, and the sensor circuit and the timer circuit can be operated regardless of the operating states of the fan and the valve.

In the above-described embodiment, the voltage doubler rectifier circuit 4 may have a structure in which a diode bridge and a smoothing capacitor are combined, and the power supply path has only one diode and a capacitor for a half cycle of the AC voltage. May be configured to be charged. Further, the photocoupler may be one using a phototriac, a transformer or the like may be used instead of the photocoupler to insulate, and the photocoupler may be directly connected without being insulated.
The phase angle control circuit 7 may be a multi-stage control of three stages or more,
You may comprise so that it may change continuously. Timer circuit 6
May be configured using a timer IC or the like. further,
The sensor circuit 5, the timer circuit 6, and the phase angle control circuit 7 may be configured by software using a microcomputer.

[0021]

As described above, according to the present invention,
The fan and valve are controlled simultaneously by the phase angle control means,
Since the power is supplied through the power supply path when the fan and the valve are stopped, the fan and the valve can be controlled by one control signal, and the fan and the valve are connected to the AC power supply by two lines. Therefore, there is no fear of incorrect wiring, and the wiring work can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional control device for an air conditioner.

[Explanation of symbols]

 1, 2 terminals 3 bidirectional voltage drop circuit (voltage generating means) 4 times voltage rectifying circuit (rectifying means) 5 sensor circuit 6 timer circuit 7 phase angle control circuit 21 AC power supply 22 fan 23 valve 25 triac (switching means) R resistance (Power supply path) D3, D4 Diodes (power supply path)

Claims (1)

[Claims] 1. A first and second terminal for connecting an AC power supply and an air conditioner, a series circuit of a switching means and a voltage generating means provided between the first and second terminals, and an output from the voltage generating means. A rectifying means for rectifying the alternating voltage, a power supply path connected to the rectifying means without passing through the phase angle control means, a sensor circuit and a timer circuit sequentially connected in parallel to the output end of the rectifying means, A control device for an air conditioner, comprising: a phase angle control circuit that controls a conduction state of the switching means according to an output of the sensor circuit.