JPS603249A - Transmitter-receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a power transmission/reception device applied to a remote control system for remotely controlling gas water heaters, oil boilers, etc. The present invention relates to a transmitting/receiving device suitable for accurate demodulation and reproduction.

Conventional configurations and their problems Traditionally, when controlling gas water heaters, oil boilers, etc. remotely, the most basic configuration was to extend a dedicated signal line from the equipment itself and attach switches, indicator lamps, etc. And many products have been commercialized. However, this method has the disadvantage that the number of signal lines increases and the wiring work becomes complicated. In particular, when connecting multiple remote controllers and trying to control them remotely from various locations, this type of signal line extension method cannot be used.

Therefore, a remote control method may be considered in which the information to be transmitted corresponds to digital bits by incorporating the tintal signal transmission technology, and the information signal is transmitted in real time. However, in order to incorporate this digital signal transmission technology into remote control systems for home energy appliances such as gas water heaters and oil boilers, it is necessary that those appliances handle fuels such as gas or oil. Therefore, reliability of signal transmission is especially required. For example, in a strong electric field near a radio broadcasting station, broadcast radio waves can interfere with information transmission, and it is necessary to ensure sufficient reliability of signal transmission against these external noises.

Purpose of the Invention The present invention provides a remote control system for household energy equipment such as gas water heaters and oil boilers that utilizes digital signal transmission technology. The purpose of this invention is to provide a circuit configuration of a transmitting/receiving device that ensures reliability of signal transmission and enables reliable and safe remote control.

Structure of the Invention The present invention provides a detection circuit for removing a carrier frequency from an information signal carried at a predetermined carrier frequency and extracting an envelope of the information signal; A differentiating circuit having a time interval larger than the bit length and passing only the alternating current component of the information signal, and an information signal output from the differentiating circuit at a predetermined threshold value.
The demodulation circuit is composed of a data reproducing circuit for level determination and waveform shaping, and is designed to improve the reliability of signal transmission against noise mixed into the information signal from the outside.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Figure 1 (5
) is a transmitting/receiving device that supplies power to other transmitting/receiving devices by connecting it to a commercial power supply AC100V, etc., and Figure 1 (B) is a transmitting/receiving device that receives power. This shows the device.

In FIG. 14, 1 indicates the entire configuration of the transmitting/receiving device on the power supply side.
Connected to 0V. 3 is a power supply circuit A, AC100
V input is required for electronic circuit operation, e.g. +12V, +5
This converts it into a stabilized DC power source such as V or a power source VB for supplying to a transmitting/receiving device on the power receiving side, which will be described later.

The power source VB may be a direct current or an alternating current at about a commercial frequency.

The terminal 4a14b connects the transmission lines sa and 5b to supply power to other transmitting/receiving devices and to transmit/receive information signals. a, connected to 7b.

In the signal superimposition and separation circuit 6, a capacitor 8 is connected in parallel with the power supply 8, a choke coil 9 is connected in series with the transmission line 5a, and a secondary winding 10b of a tuned transformer 10 is connected to the capacitor 11 between the transmission lines. connected via. With such a configuration, the information signal on the transmission line 5a15b is blocked by the choke coil 9, and most of the information signal appears at both ends of the tuned transformer secondary winding 10b, and the information signal is input and output via the tuned transformer 10. be able to. Also, power supply VB
By making the frequency component of the information signal much smaller than the carrier frequency of the information signal, the choke coil 9 can have a low resistance to the power supply VB, so power can be supplied efficiently, and By setting the capacitor 11 to an appropriate capacitance value, the tuned transformer secondary winding 10b
In addition, it is possible to prevent the influence of power supply (8) from appearing.

A resonant capacitor 12 is connected to both ends of the tuned transformer primary winding 10a, and +12V is connected to the intermediate tap.
It is configured to vibrate around 12V. Further, a demodulation circuit 13 and a modulation circuit 14 are connected to both ends of the tuned transformer primary winding 10a.

In the demodulation circuit 13 shown in FIG. 2, 15 and 16 are diodes, each having its anode terminal connected to both ends of the tuned transformer primary winding 10a, and its cathode terminal connected in common to the tuned transformer 1. This is for double-wave rectification of the oscillating voltage generated between the next winding 10a. Note that the tuning transformer 10 is tuned to a carrier frequency for conveying information signals, and the signals transmitted via the transmission lines 5a and 5b are transmitted through the tuning transformer 10 and the resonant capacitor 1.
It is possible to efficiently detect only the information signal having a frequency that resonates at 2.

A capacitor 17 and a resistor 18 are connected in parallel to the cathode terminals of the aforementioned commonly connected diodes 15 and 16 to form a detection circuit 19. Hi, capacitor 17 and resistor 1
By configuring the time constant determined by 8 to be larger than the period of the carrier frequency, it is possible to cut off the carrier frequency of the information signal excited by the tuning transformer 10 and detect the envelope of the information signal. Furthermore, by performing double-wave rectification using the diodes 15 and 16 as described above, the envelope of the information signal can be reproduced very faithfully.

FIG. 399(C) shows the output waveform of the detection circuit '9. Oka, (a) shows the original transmission data (the phantom shows the information signal appearing in the primary winding 10a of the tuned transformer).

After the detection circuit 19, a differentiation circuit 22 is connected, which is configured by connecting a capacitor 20 and a resistor 21 in series. The time constant determined by the resistor 20 and the resistor 21 is configured to be larger than the 1-bit length of the information signal.

<d) in FIG. 3(5) shows a signal waveform at the connection point between the capacitor 20 and the resistor 21 of the differentiating circuit 22, and is applied to the transistor 24 through the resistor 21. The transistor 24 is turned on at a signal level higher than the vBE voltage of the transistor 24 than the ground potential (GND).
Since it is turned off below this value, it is possible to use this to determine data 0.37 and data "1°36" of the information signal.

23 is a diode reversely connected between the base and emitter of the transistor 24, and 25 is a pull-up resistor for the collector of the transistor 24, which together with the NAND gate 26 constitutes a data reproducing circuit 27.

3(5) is the collector voltage waveform of the transistor 24, and I is the output waveform of the NAND gate 26, which almost reproduces the original information in FIG. 3(5).

The information signal reproduced by the demodulation circuit 13 is inputted from the input terminal (IN) of the transmitting/receiving digital logic circuit 30 and is processed in accordance with a predetermined communication protocol. Note that some examples of communication rules will be described later.

In FIG. 1 4), 28 is a clock generation circuit,
This output is supplied as a signal to the transmitting/receiving digital logic circuit 30, and is also given as a carrier signal to the modulation circuit 14, which converts the baseband forming information signal output from the output terminal (OUT) of the transmitting/receiving digital logic circuit 30. , NAND gate 29 modulates the signal using a tone burst method.

The transmitting/receiving digital logic circuit 30 manages the transmission and reception of information signals according to predetermined communication rules, and also controls the transmission and reception of information signals based on a predetermined communication protocol.
This is a cost-effective circuit that exchanges input/output information with the input/output circuit 31 consisting of keys, switches, relays, volumes, sensors, etc., and is based on the program logic of the microconbeater. can be realized.

Next, in FIG. 1(B), numeral 32 indicates the overall configuration of the transmitting/receiving device on the power receiving side. Transmission lines 5a and 5b are connected to the terminals 33a and 33b, and receive transmitted power and input and output information signals.

Figure 1 (
As explained in 5), in the transmitting/receiving device on the power receiving side, the diode bridge 34 is used to connect the transmission line 5.
The connections of a and 5b to the terminals 33a and 133b are made non-polarized.

Reference numeral 35 denotes a power supply circuit B, which converts the transmitted power supply VB into a stabilized DC voltage of, for example, +12V or +5V, and causes the transmitting/receiving device 320 to operate.

The other circuit blocks are the same as those explained in FIG. 1(5), so their description will be omitted.

For blogs with the same function, the same number is used.

Next, an example of the above-mentioned communication protocol will be mentioned.

FIG. 4 shows an example of the signal packet structure of the information signal to be transmitted and received, and FIG. 5 shows an example of the unit code forming the information signal.

In Figure 4, the start of the signal packet is synchronization code 38.
is provided with a length of 2 bits, and a special bit pattern as shown in FIG. 5C is assigned. The bit pattern of this synchronization code is such that it will never appear in the subsequent fields of test error address 39, data 40, and error check 41. In other words, from guest address 39 onward, the address shown in FIG.
), ←) in which the data is inverted at T/'2 is used, and the combination of these codes does not have the bit pattern of the synchronization code described above.

Information signals having such a unit code and signal packet structure are inputted and outputted in a bit-serial manner by the transmitting/receiving digital logic circuit 30, and information is exchanged between the transmitting and receiving devices.

In the above configuration, even if the external noise {circle around (2) shown in FIG. Data “O” appears near the center of the change in the signal envelope.
Since the circuit is configured to judge between ' and 1'', the third
As shown in (b), (e), and (f) of Figure (B), it has a very high ability to exclude external noise.

Effects of the Invention As is clear from the detailed explanation above, the present invention uses a detection circuit to remove the carrier frequency from an information signal carried at the carrier frequency, and then uses a differentiating circuit and a data reproducing circuit to extract the information. Since the data is regenerated at a threshold level near the center of the signal change, as mentioned above, it has a very strong ability to eliminate external noise, making it ideal for gas water heaters. The present invention can be applied to 7-stem remote control systems for household A/L equipment such as oil boilers to achieve safe remote control.

[Brief explanation of the drawing]

Figures 1 (5) and (B) are circuit diagrams of a transmitting and receiving device showing an embodiment of the present invention, Figure 2 is a partial circuit diagram, and Figure 3 (
A+ is also a timing chart of some signal waveforms, the third
Figure (B) is the same timing chart of the B signal waveform when external noise is added, Figure 4 is the configuration diagram of the signal packet, and Figures 5 (a), (c), and (C) are the same. This figure shows the structure of a unit code, in which (a) shows the case of logic 0, figure 4) shows the case of logic 1'', and figure (C) shows the case of synchronous code. 1 ~ ...Transmitting/receiving device (power supply side), 5a15b・
...Transmission line, 1o...Tuning transformer, 13
... Demodulation circuit, 15.16- ... Rectifier, 1
9...detection circuit, 22-...differentiation circuit, 27
′...Data reproducing circuit, 32...Transmitting/receiving device (power supply receiving 11''). Name of agent: Patent attorney Toshi Nakao (1 person, 26)
0- 3 Figure (A) Flush --- (rND (C) --GND 3rd tQ (B) −
−−−−−−−−(tND(C+ 111−−−−−−−−−−−−
−−−−～−6NρRF No. 40 Fig. 5 tQ α] (1”)

Claims (1)

[Claims] (1) A detection circuit for removing a carrier frequency from an information signal carried at a predetermined carrier frequency;
a differentiating circuit provided after the detection circuit and having a time constant larger than one bit length of the information signal; and a differentiating circuit provided after the differentiating circuit and converting the data of the information signal at a predetermined threshold value to '0''.
A transmitting/receiving device comprising a demodulating circuit comprising a data reproducing circuit for discriminating between and data 1 and for waveform shaping. (■ In addition to transmitting and receiving information signals carried at the carrier frequency using a tuned transformer that resonates at the carrier frequency,
2. The transmitting/receiving device according to claim 1, wherein a detection circuit is connected to the tuned winding side of the tuned transformer. (3) A detection circuit is placed on the tuned winding side of the tuned transformer,
3. The transmitting/receiving device according to claim 2, comprising a rectifying element connected to one terminal thereof, and an integrating circuit connected to the other terminal of the rectifying element and having a time constant larger than the period of the carrier frequency. (b) The transmitting/receiving device according to claim 3, wherein rectifying elements are connected to both ends of a tuning transformer to perform double-wave rectification of the modulated information signal.