JPH03213945A - Controller of air conditioner - Google Patents

Abstract

PURPOSE:To reduce the installation time and prevent an erroneous connection work from being generated by a method wherein a data exchanging operation between an indoor device and an outdoor device of a separate-type air conditioner is carried out while being overlapped in a commercial power supply on a power line. CONSTITUTION:An AC power supply supplies an electrical power from a power supply plug 1 to an indoor air conditioner through a blocking circuit 12 and to an outdoor air conditioner 3 so as to control a driving of a compressor by an outdoor electronic control device 11 through a surge absorbing circuit 7, a noise filter circuit 8 and a frequency converter device 9. A data exchanging between the indoor electronic control device 6 and the outdoor electronic control device 11 is carried out while being overlapped with the commercial power supply on the power lines 4a and 4b. In this way, it is possible to shorten an installing work time and to prevent disadvantages from being generated due to an erroneous connection.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in a communication means for transmitting and receiving communication signals between an indoor unit and an outdoor unit in a separate air conditioner, and to an improvement in installation work. BACKGROUND OF THE INVENTION Conventional Communication Means ζ The invention seeks to solve the problem by connecting the electronic control device of the indoor unit and the electronic control device of the outdoor unit through a dedicated communication line and exchanging information between the indoor unit and the outdoor unit through this line. ChallengesWhen installing a conventional separate air conditioner,
The connection between the indoor unit and the outdoor unit requires a total of 4 cables, including a power line and 2 dedicated communication lines, and the connection work takes a lot of time. If the polarity of the dedicated communication line is incorrect, or if the power line and the dedicated communication line are connected incorrectly, problems such as communication failure or destruction of the electronic control device may occur. 4 is a block wiring diagram of a control device for a separate type air conditioner in a conventional example. 4 In the figure, ■ is a power plug, 2 is an indoor unit a of a separate type air conditioner, and 3 is an outdoor unit of a separate type air conditioner. 71o4a and 4b are power lines connected between the indoor unit 2 and the outdoor unit 3; 5a and 5b are the power lines connected to the indoor unit 2
6 is the indoor electronic control unit 11, the outdoor electronic control unit iL7 is the surge absorption section, 8 is the noise filter, and 9 is the frequency converter I.
O is a compressor, and commercial power (Y) is supplied to the outdoor unit 3 via power lines 4a and 4b. Communication between the indoor electronic control unit 6 and the outdoor electronic control unit 11 (communication line 4A,
Therefore, when performing installation work, the connection between indoor unit 2 and outdoor unit 3 requires a total of 4 cables, 2 each of power lines and dedicated communication lines, and the connection work takes a lot of time. In addition, communication is performed using DC low voltage signals.If the polarity of the dedicated communication line is incorrect or the power line and dedicated communication line are connected incorrectly, problems such as communication failure or destruction of the electronic control device may occur. SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and aims to shorten installation time and prevent problems caused by incorrect connections by sharing power lines and communication lines.

Means for Solving the Problems In order to achieve this object, the present invention (friend) is provided.In a separate air conditioning system in which commercial power is supplied to an indoor unit, a modulation unit that modulates a communication signal with a high frequency signal, and a a coupling unit that superimposes a high frequency signal on a commercial power supply on a power line connected between the indoor unit and the outdoor unit and selectively receives the high frequency signal superimposed on the commercial power supply; a demodulation unit that demodulates the high frequency signal; The blocking filter part installed in the indoor unit and the coupling part force of the outdoor unit (installed between the surge absorption circuit and the noise filter circuit installed in the population of the outdoor unit, and the tuning frequency of the coupling part is set in multiple stages) This device is configured to be able to vary the size of the signal input to the receiving section so as to communicate with each other between the indoor unit and the outdoor unit. Effects of the present invention When installing a separate air conditioner with this configuration, it is possible to share the power line and the communication line, shortening the installation time and preventing problems caused by incorrect connections. An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a block wiring diagram of a control device for a separate air conditioner according to an embodiment of the present invention. 2 is the indoor unit of the separate air conditioner [3 is the outdoor unit of the separate air conditioner]
4a and 4b are the power lines 6 connected between the indoor unit 2 and the outdoor unit 3, the indoor electronic control unit [11 is the outdoor electronic control unit W]
L 7 is the same area as surge absorption 8 is the same area as noise filter 9
is a frequency converter! 10 is a compression a; 11 is a blocking filter circuit; Commercial power supply (power line 4 a, 4
Communication between the indoor electronic control device 6 and the outdoor electronic control device 11 is similarly performed via the power lines 4a and 4b.

These details will be explained using Figs. 2 and 3. Fig. 2 shows the block wiring of the indoor electronic control device 6.
Fig. 3 is a diagram of signal waveforms at various parts in Fig. 2. In the same figure,
21 is a control section 22 is a modulation section 23 is a demodulation section 24 is a coupling circuit a. In the case of transmission, the signal SIU output from the control section 21 is converted into a high frequency signal S2 by the modulation circuit 22 and further by the coupling circuit 24. Power line 4 a, 4
b (S3). On the other hand, in the case of reception, the signal S3 superimposed on the commercial power supply on the power lines 4a and 4b is detected by the coupling circuit 24 (S4), and the signal output S5 is further demodulated by the demodulation circuit 23 and manually input to the control section 21. The control device 11 has the same configuration as the indoor side, and although data can be exchanged with each other, these high-frequency signals (Table 1) may leak from the air conditioner side to the power supply side due to the programming filter circuit 12, adversely affecting other equipment. In addition, noise intrusion from the power supply side is suppressed.T'1. Malfunctions and the like are prevented from occurring. In the figure, 31 is a surge absorption wide opening 32 is a coupling port i, and 51 is a noise filter circuit.
Outdoor electronic control device 10, surge absorption circuit 31
This can prevent damage caused by surge voltages applied between power lines and between power supply grounds due to lightning or the like. The noise filter circuit 51 suppresses noise generated from a frequency converter (not shown) and prevents the coupling circuit 32 from receiving erroneous signals. Coupling circuit 3
The tuning frequency of 2 can be switched in multiple stages by switches 33-3 and 42-44 and capacitors 36-38, 48-50. This is because the impedance of the transmission path changes depending on where the air conditioner is installed.
This is to prevent communication from becoming impossible.a Demodulation circuit 5
Table 1 shows the level of the input signal of No. 2. Switches 45 to 47 and resistors 48 to 50 are used to switch to a plurality of levels. This is to prevent communication from becoming impossible due to changes in the level of noise entering the transmission line depending on where the air conditioner is installed. This situation will be explained with reference to Figure 5. Figure 5 shows the state of the input signal to the demodulation circuit. By adjusting the input signal of the input signal to be higher than the input sensitivity level of the demodulation circuit, communication can be carried out without any trouble.Effects of the Invention As is clear from the above embodiments, the present invention (both the indoor side and the indoor side of a separate type air conditioner) External data exchange is performed by superimposing the commercial power supply on the power line, so it is difficult to perform installation work.
It has the effect of shortening installation time and preventing problems caused by incorrect connections.a

[Brief explanation of drawings]

FIG. 1 is a block wiring diagram according to an embodiment of the present invention.
The figure is a block wiring diagram of the indoor electronic control device in the same embodiment. Figure 3 is the signal waveform diagram of each part in Figure 2. Figure 4 is the circuit diagram of the outdoor coupling part circuit and peripheral part in the same embodiment. FIG. 6 is a block diagram showing the state of the input signal of the demodulator circuit in the same embodiment. A 2... Indoor air conditioning a 3... Indoor air conditioning 4a, 4b ... Power line 6 ... Indoor electronic control device 7 ... Surge absorption wide opening 8 ... Noise filter circuit i 11 ... Outdoor electronic control device w
L12...Blocking apposition 22...Modulation apposition 23-...Demodulation circuit 24...Coupling circuit

Claims (2)

[Claims] (1) In a separate air conditioning system in which commercial power is supplied to an indoor unit, there is a modulation unit that modulates a communication signal into a high-frequency signal, and a modulation unit that transmits the modulated high-frequency signal to a power line connected between the indoor unit and the outdoor unit. a coupling unit that is superimposed on a commercial power source and selectively receives a high frequency signal superimposed on the commercial power source;
A demodulation section that demodulates the high frequency signal, a blocking filter section installed in the indoor unit, and a coupling section between the outdoor unit are installed between a surge absorption circuit and a noise filter circuit installed at an entrance of the outdoor unit. The control device for an air conditioner performs communication between an indoor unit and an outdoor unit, and the tuning frequency of the coupling portion is configured to be variable in a plurality of steps. (2) The control device for an air conditioner according to claim 1, wherein the control device for an air conditioner is configured so that the magnitude of the input signal to the receiving section can be varied in a plurality of steps.