JPH0329494A - Signal transmission circuit for air-conditioner - Google Patents

Abstract

PURPOSE:To attain the signal transmission in two ways by sending a signal with a transmission voltage level on one hand and sending the signal while superimposing a pulse with the transmission voltage level on the other hand in the signal transmission between controllers indoor and outdoor so as to discriminate the presence of the pulse. CONSTITUTION:A resistor 5 in a pulse superimposing circuit 7 is connected to a comparator C3 of a transmission voltage level discrimination means 4 and a transistor(TR) Q4 of a pulse superimposing circuit 7 is operated only at a minimum transmission voltage level E3. Moreover, the output of comparators C1-C3 of the transmission voltage level discrimination means 4 is constant independently of the presence of superimposition of the pulse. A pulse waveform is obtained from an output of a comparator C4 of an indoor pulse discrimination means 8 by setting a reference voltage of the comparator C4 to a B1 voltage without changing the transmission voltage level. Then a pulse static processing circuit 9 applies static processing to the pulse when the output of the comparator of the pulse discrimination circuit 8 goes to an L level and inputs an L level to an indoor controller 3. Thus, 2-way signal transmission is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a signal transmission circuit between control devices of air conditioners. 2. Prior Art Conventional signal transmission circuits between control devices of air conditioners have been used to transmit data between indoors and outdoors, to transmit DC voltage levels from indoors to outdoors, and to perform AC control such as relays. All of these are installed with two power lines and two signal lines as the connection lines between the indoor unit and the outdoor unit, and the above configuration can be used depending on the volume of control content and cost. was. For example, an inverter type uses indoor/outdoor transmission.

An example of a conventional indoor/outdoor signal transmission circuit of an air conditioner will be described below with reference to the drawings.

FIG. 7 and FIG. 8 are an indoor/outdoor signal transmission circuit diagram and an operation explanatory diagram of a conventional air conditioner.

In FIG. 7, on the indoor side, 1 is a transmission voltage level generation section, 2 is a transmission level selection output section, and 3 is an indoor control section; on the outdoor side, 4 is a transmission voltage level discrimination section, and 5 is an outdoor control section. Department. RYC and RY-HOT are relays for controlling the compressor and four-way valve. Indoor and outdoor control is performed by turning on and off transistors Q1 to Q3 of the transmission voltage level generating section l.
By the FF, the divided voltage of the resistor R4 and the resistors R1 to R3 is obtained as an indoor/outdoor transmission voltage level. The control section 1 takes in the room temperature, human power, etc., determines the pattern necessary for outdoor control, and outputs ON/OFF signals for the transistors Q1 to Q3 from the transmission level selection output section 2. In the left matrix of Figure 8, A, B, C
correspond to A, B, and C of the transmission level output section 2 in Fig. 7. PO to P3 are patterns necessary for outdoor control, such as PO...Cooling thermo OFF, PI...
Cooling thermo ON, P2・・・Heating thermo OFF
, P3...Heating thermometer ○N. The transmission voltage level EO~E3 corresponding to this PO-P3 is the transistor Ql~Q3.
It can be obtained by turning on and off.

The voltage level determining means 4 in FIG. 7 is a comparator C1-C.
3, and each reference voltage Vl-V
3 as shown in FIG. 8, each transmission voltage level EO~E3
By setting the voltage to an intermediate voltage, the outputs of the comparators C1 to C3 change in response to the 1θ1 control pattern PO-P3 as shown in the right-hand matrix of FIG. 8, and the control pattern can be recognized. The outdoor control section 5 inputs the outputs of the comparators C1 to C3 according to this control pattern, and performs necessary controls on the compressor, four-way valve, etc. Problems to be Solved by the Invention However, in the conventional signal transmission circuit of an air conditioner, multiple control contents can be transmitted using two signals.
If the signal transmission is one-sided from the indoor side to the outdoor side, but the signal cannot be transmitted from the outdoor side to the indoor side, and mutual signal transmission between the indoor side and the outdoor side is required, a microcontroller that can transmit mutual data is required. Either an expensive control device using a conventional circuit or two conventional circuits must be prepared, which increases the cost of the control device, increases the cost of increasing the number of indoor and outdoor connection lines, and increases the complexity of construction. , a transmission voltage level system was needed that could transmit signals in both directions. Means for Solving the Problems In order to solve the above problems, the present invention provides a control device having a transmission voltage level determining means, a pulse generating means and a pulse generating means for any one transmission voltage level as a transmission signal. A pulse superimposing means for superimposing the signal is provided, and a pulse discriminating means is provided on the control device 4B side having the transmission voltage level generating means.

Another means of the present invention is to use a pulse superimposition circuit that sets the transmission voltage level at which pulses are superimposed to the lowest transmission voltage level in order to increase the voltage difference between the transmission voltage level and the pulse level and the respective discrimination levels. be. Another means of the present invention is a pulse superimposition circuit that superimposes pulses on a plurality of transmission voltage levels in order to transmit a plurality of signals.

By superimposing a pulse on the transmission voltage level by the action pulse generation means and by determining the presence or absence of the pulse by the pulse discrimination means, one signal transmission is performed at the transmission voltage level and the other signal is transmitted by the pulse, thereby achieving bidirectional transmission. Can transmit signals. By superimposing it on the lowest level, the circuit reliability can be increased by increasing the voltage difference between the transmission voltage level, pulse level, and each discrimination level. Also, by making multiple pulses superimposed on the transmission voltage level, the number of signal transmissions is amplified. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 are circuit diagrams and operation explanatory diagrams of a signal transmission circuit of an air conditioner in an actual example of the present invention. be.

In FIG. 1, a transmission voltage level generation section 1, a transmission level selection output section 2, an indoor control section 3, a transmission voltage level determination section 4, and an outdoor control section 5 are the same as the conventional circuit. 6 is a pulse generating means, and 7 is a pulse superimposing circuit that superimposes the pulse from the pulse means 6 on the lowest voltage level of the transmission voltage level. Reference numeral 8 denotes a pulse discriminating means for discriminating the presence or absence of a pulse superimposed on the transmission voltage level. 9 is a pulse static converting circuit that changes the signal of the pulse discrimination stage 8 to a static level. The pulse generating means 6 and the pulse superimposing circuit are provided on the outdoor side, and the pulse discriminating means 8 and the pulse staticization circuit 9 are provided on the indoor side. In FIG. 2, the operation of the circuit diagram of FIG. 1 will be explained. Generation and determination of the transmission voltage level from the indoor side to the outdoor side are conventional. The resistor 5 of the pulse superimposition circuit g}7 in FIG. 1 is connected to the comparator C3 of the transmission voltage level determining means 4, and in the right matrix of FIG. 2, only when the control pattern P3, that is, the lowest transmission voltage level E3 , the transistor Q4 of the pulse superimposition circuit 7 in FIG. 1 can be operated. In FIG. 2, at the lowest transmission voltage level, pulses are superimposed as shown in the level diagram in the center. Since the pulse is superimposed on the lowest transmission voltage level, the outputs of the comparators Cl to C3 of the transmission voltage level determining means 4 are constant regardless of whether or not the pulse is superimposed. The output of the comparator C4 of the 1,000-stage pulse discrimination stage 8 on the indoor side is the base 1 of the comparator C4! By setting the voltage to the B1 voltage as shown in the transmission voltage level diagram in the center of Figure 2, a pulse waveform can be obtained in the output without changing the transmission voltage level. The pulse staticization circuit 9 is a pulse discrimination circuit 8.
When the output of the comparator becomes L, the pulse (on which the pulse is superimposed) is converted into a statinoku, and the L level is manually input to the indoor control device 3.

FIGS. 3 and 4 are a circuit diagram and an operation explanatory diagram when a superimposed pulse is input at the second highest transmission voltage level in a second embodiment of the present invention.

The transmission voltage level E1 corresponds to the control 111 pattern P1, and at this time, only the comparator output C1 is 1■, and the pulse superimposition circuit is connected to the output of the comparator Cl as shown in FIG. The pulse superimposition level is determined by the resistor 6 of the pulse superimposition circuit 7. The transmission voltage level and discrimination level in the center of Figure 4 are at the second level compared to Figure 2.
The voltage difference shown in the figure is larger and the reliability of discrimination is improved. 5 and 6 are circuit diagrams and operation explanatory diagrams when pulses are superimposed on a plurality of transmission voltage levels in the embodiment shown in FIG. 3 of the present invention. Effects of the Invention According to the signal transmission circuit for an air conditioner according to the present invention, for signal transmission of indoor and outdoor control devices, a transmission voltage level is transmitted from one side, and a pulse is superimposed on the transmission voltage level from the other side, and the pulse is transmitted at the transmission voltage level. By determining the presence or absence of the The system used can be configured. In addition, by superimposing a pulse on the lowest voltage level of the transmission level, the comparator output of the transmission level judgment means does not change depending on the presence or absence of a pulse, and the circuit structure of the transmission level judgment means can be kept as simple as before. At the same time, it is possible to increase the voltage difference between the transmission voltage level, the Hihalus level, and each discrimination level, thereby improving circuit reliability. Furthermore, by making multiple pulses superimposed on the transmission voltage level, the number of signal transmissions can be increased, making it possible to improve the functionality of air conditioner control.

[Brief explanation of drawings]

FIG. 1 is a signal transmission circuit diagram of an air conditioner in which N pulses are applied to the lowest transmission voltage level in one embodiment of the present invention, FIG. 2 is an explanatory diagram of the same operation, and FIG. 3 is a second embodiment of the present invention. A signal transmission circuit diagram of an air conditioner in which pulses of any one of the transmission voltage levels are superimposed in the embodiment, FIG. 4 is an explanatory diagram of the same operation, and FIG. 5 shows the transmission voltage level in the third embodiment of the present invention. Fig. 6 is an explanatory diagram of the same operation, Fig. 7 is a signal transmission circuit diagram of a conventional air conditioner, and Fig. 8 is a signal transmission circuit diagram of a conventional air conditioner. FIG. 3 is an explanatory diagram of the operation of the signal transmission circuit. 1... Transmission voltage level generation means, 2...
・Transmission level selection output unit, 4...Transmission voltage level discrimination unit, 6...Pulse generation means, 7...
...Pulse superimposition circuit, 8...Pulse discrimination circuit.

Claims (3)

[Claims] (1) Separate type air conditioner that has control devices on the indoor side and outdoor side, one control device has transmission level generation means that generates multiple transmission voltage levels, and the other control device discriminates pulses from the control device. The other control device includes voltage level determining means for determining the plurality of transmission voltage levels, pulse generation means for generating a pulse to be superimposed on the transmission voltage level, and the other control device has a pulse determining means for determining the transmission voltage level. A signal transmission circuit for an air conditioner having a pulse superimposition circuit that superimposes pulses on one of the voltage levels. (2) The signal transmission circuit for an air conditioner according to claim (1), wherein the transmission voltage level at which the pulses are superimposed is set to the lowest voltage level. (3) Separate type air conditioner that has control devices on the indoor side and outdoor side, one control device has a transmission level generation means that generates multiple transmission voltage levels, and the other control device discriminates pulses from the control device. the other control device includes voltage level determining means for determining the plurality of transmission voltage levels, and pulse generation means for generating a pulse to be superimposed on the transmission voltage level;
A signal transmission circuit for an air conditioner, comprising a pulse superimposition circuit that superimposes pulses on a plurality of the transmission voltage levels.