JPH0395346A - Controller for air conditioner - Google Patents

Abstract

PURPOSE:To prevent defects caused by a shortened erection work period and wrong connections from occurring by a method wherein data exchange between a room and an outdoor side apparatus of a separate type air conditioner is carried out by multiplexing the data over a commercial power source of a power cable. CONSTITUTION:Data are multiplexed over a commercial power source of power cable by connection circuits, and an outdoor side has the same constitution as a room side, so that they can exchange data with each other. A blocking filter circuit on the room side forms a serial resonance circuit including an inductance 35 and a capacitor 36, and a parallel resonance circuit including an inductance 31 and a capacitor 32, so as to prevent noise from entering the carrier frequency components from the power source side, and from coming out from an air conditioner side to the power source side. An outdoor side electronic controller is protected by surge absorption circuit 41 against breakdown due to a surge voltage which is impressed between the power lines or power source earthes by a thunder. A noise filter circuit 43 controls noise generated by a frequency modulator to prevent a connection circuit 42 from receiving wrong signals.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to an improvement in communication means for transmitting and receiving communication signals between an indoor unit and an outdoor unit in a separate type air conditioner, and an improvement in installation work. .

Prior art Conventional communication means (Table: Connecting the electronic control device of the indoor unit and the electronic control device of the outdoor unit through a dedicated communication line {1) The invention attempts to solve the problem by exchanging information between the indoor unit and the outdoor unit through this. Challenges When installing a separate type air conditioner, the connection between the indoor unit and outdoor unit must be made using two power lines and two dedicated communication lines.
A total of four cables are required, and the connection work takes a lot of time.Furthermore, communication is carried out using DC low-voltage signals, so it is possible to mix up the polarity of the dedicated communication line or mix it with the power line. If you connect the wrong communication line, you may be unable to communicate or the electronic control device may be damaged.
The present invention is intended to solve the above-mentioned conventional problems, and aims to shorten installation work 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) provides a separate air conditioning system in which commercial power is supplied to an indoor unit, a modulation section that modulates a communication signal with a high frequency signal, and a modulation section that modulates a communication signal with a high frequency signal. a coupling unit that superimposes the high frequency signal on a commercial power source 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; and a demodulation unit that demodulates the high frequency signal. , Force exchange between the blocking filter section installed in the indoor unit and the outdoor unit; Installed between the surge absorption circuit and the noise filter circuit installed at the inlet of the outdoor unit; In a system in which a compressor installed in an outdoor unit is driven and controlled by a frequency converter, the frequency converter is connected between the power lines of the noise filter circuit. A series circuit of an inductance and a capacitor tuned to the switching frequency is inserted.Furthermore, the present invention allows the carrier frequency of the high frequency signal and the blocking characteristic of the blocking filter section to be set in multiple stages. It is designed so that it can be done.

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, thereby shortening the installation time and preventing problems caused by incorrect connections.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 6 is a block diagram of a conventional control device for a separate air conditioner. In the same figure,
1 is a power supply plug 'S, 2 is an indoor unit a of a separate type air conditioner, and 3 is an outdoor unit of a separate type air conditioner. 4
a, 4b are power supplies connected between the indoor unit 2 and outdoor unit 3; 5a, 5b are communication lines connected between the indoor unit 2 and outdoor unit 3; 6 is the indoor electronic control unit i1
1 is an outdoor electronic control device; 7 is a surge absorption cell; 8 is a noise filter circulation; 9 is a frequency conversion device 10 which is a compressor. Commercial power (supplied to the outdoor unit 3 via power lines 4a, 4b).Communication between the indoor electronic control device 6 and the outdoor electronic control device 1.1 (communication lines 4a, 4)
This is done via b. 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, which requires a lot of time for connection work.In addition, the communication requires low DC voltage. If the polarity of the dedicated communication line is incorrect or the power line and the dedicated communication line are connected incorrectly, communication may become impossible.
There are defects such as destruction of electronic control equipment. FIG. 1 is a block diagram of a control device for a SEBA 1 notebook type air conditioner according to an embodiment of the present invention. In the figure, 1 is the power supply plate. 2 is the indoor unit of the separate air conditioner. 3 is the outdoor unit of the separate air conditioner. 4a, 4
b is a power cable connected between the indoor unit 2 and the outdoor unit 3; 6
The indoor electronic control device 11 is the outdoor electronic control device. 7 is a surge absorption circuit. 8 is a noise filter circuit. 9 is a frequency conversion device. 1. The compressor 11 is a blocking filter circuit. Commercial power 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 is also provided via power lines 4a and 4b.
4b. For these details please refer to the second
This will be explained using the drawings and FIG. FIG. 2 shows the block connections of the indoor electronic control device 6. FIG. 3 is a signal waveform diagram of each part in FIG. In the figure, 2l is a control circuit 22, a modulation circuit 23, a demodulation circuit 24, a coupling circuit 25, and a carrier frequency command circuit. In the case of transmission, the signal S 1 +& outputted from the control unit 21 is converted into a high frequency signal S2 by the modulation circuit 22, and is further transmitted to the power line 4 by the coupling circuit 24.
a. 4 superimposed on the commercial power supply (not shown) on b (S
3). 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 demodulated by the demodulation circuit 23 and input to the control unit 2l. Ru. The outdoor electronic control device l1 has the same configuration as the indoor electronic control device, and data can be exchanged with each other. Carrier frequency command circuit 25 (dai
It commands the carrier frequency of the modulation circuit 22, and is intended to prevent malfunctions due to force noise, etc., which will be explained in detail later. FIG. 4 is a diagram showing the internal circuit structure of the blocking filter circuit. In the same figure, 31, 35 are inductors, 3L33, 36, 37 are capacitors, 3
4 and 38 are switches. Symptom switch 34, 38
is left open. The inductance 35 and capacitor 36 form a series resonance circuit, and the inductance 31 and capacitor 32 form a parallel resonance circuit, suppressing noise intrusion from the power supply side at a certain carrier frequency and noise emitted from the air conditioner side to the power supply side. Noise entering from outside (
Friend: Since the frequency varies greatly depending on the location where the air conditioner is installed, depending on the location, it may be better to move the carrier frequency to reduce malfunctions due to noise.
In such a case, the carrier frequency command circuit 25 lowers the carrier frequency slightly by 1 DEG, and at the same time the switch 34
By closing 38, malfunctions due to noise entering from the outside can be prevented. The surge absorption circuit 42 and the coupling circuit 43 are noise filter circuits.The outdoor electronic control device 11i &
The surge absorption circuit 4l 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 43 suppresses the noise generated from the frequency converter (not shown) and prevents the coupling circuit 42 from receiving erroneous signals.In particular, the noise filter circuit 43 suppresses the noise generated from the frequency converter (not shown) and prevents the coupling circuit 42 from receiving erroneous signals. The circuit (resonant frequency ζ table, matched to the switching frequency of the frequency converter) can be configured to effectively suppress the noise generated by the frequency converter.
Prevent malfunction.

Effects of the Invention As is clear from the above embodiments, the present invention (i.e., data exchange between the indoor and outdoor sides of a separate type air conditioner is performed by superimposing the commercial power supply on the power line), which saves time during installation work. This has the effect of preventing problems caused by shortening and incorrect connections.

[Brief explanation of drawings]

FIG. 1 shows block wiring according to an embodiment of the present invention.
Figure 3 shows the signal waveforms of each part in Figure 2 @ Figure 4 shows the circuit of the blocking filter in the same example Figure 5 shows the outdoor side in the same example FIG. 6 is a block diagram of the circuit of the coupling section and peripheral section according to a conventional example. 2... Indoor air conditioning 3... Outdoor air conditioning @ 4a. 4b...Power 1 & 6...Indoor electronic control unit 7...Surge absorption circulation 8...Noise filter respiration l1...Outdoor electronic control unit fil
12...Blocking filter repetition 22...
・Modulation rotation 23... Demodulation recovery 24... Combination recovery 25... Carrier frequency command rotation

Claims (3)

[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. A control device for an air conditioner that communicates between an indoor unit and an outdoor unit. (2) In a system in which a compressor installed in an outdoor unit is driven and controlled by a frequency converter, a series circuit of an inductance and a capacitor tuned to the switching frequency of the frequency converter is connected between the power lines of the noise filter circuit. 2. The air conditioner control device according to claim 1, wherein: (3) The air conditioner control device according to claim 1, wherein the carrier frequency of the high-frequency signal and the blocking characteristic of the blocking filter section can be set in a plurality of stages, and can be changed in conjunction with each other.