JPH0321139A - signal processing device - 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 [Object of the Invention] (Industrial Application Field) The present invention relates to a signal processing device that utilizes voltage signals of different voltage values as power supply and control signals.

(Prior Art) Conventionally, as such a signal processing device, there has been one having a circuit structure as shown in FIG. This device transmits time-divided bipolar pulses from the central processing unit through a two-wire transmission line.
The pulse is received by the pulse input section 1, rectified by the diode bridge 3a, and connected to the resistors 3c, 3d. }-Lunge. Star 3e, Zener diode 3f and smooth capacitor 3g
The stabilized power supply circuit 3b cuts off the high voltage part 1 and supplies a constant voltage to a control section having a power supply input section, a signal input section, and a control signal output section. A current prevention resistor 51 and a Zener diode 52 are connected in series, and a resistor 51 and a Zener diode 5 are connected in series.
By connecting the center of 2 to the signal input section of the control section 8 and setting the set voltage value of the Zener diode 52 to about the positive value of the bipolar pulse, the signal input section 6 is connected only when the positive value of the bipolar pulse is detected. The pulse is determined without receiving any signal input, and based on this, the control output section 7 outputs a control signal for controlling the load and the like.

(Problems to be Solved by the Invention) With such a structure, a Zener diode is essential in the discrimination section 50. However, the zener diode
There are many variations in quality, that is, variations in Zener voltage. In other words, since the received voltage is variable, it has been a challenge to improve the reception accuracy.

In addition, in recent years, the extent to which it is possible to integrate various electric circuits has become a technical issue, and in this case, at most, only the control section 7 can be integrated, and there is a limit to integration. Ta.

The present invention has been made in view of the above-mentioned problems, and its purpose is to enable accurate discrimination of pulse signals with a simple structure, and also to enable more integrated circuits than before. An object of the present invention is to provide a signal processing device.

[Structure of the Invention] (Means for Solving the Problems) The structure of the signal processing device of the present invention will be explained with reference to FIG. The signal processing device of the present invention is configured such that <ov and +χv, o are sent from the pulse sending side through a pulse signal line 2 such as a transmission line.
v and −χv. −χv. a pulse input section 1 into which a pulse signal in which different voltage values such as =10χV change over time is input;
A constant voltage section 3 that rectifies and smoothes the output voltage of this pulse input section], a power input section 5, a signal input section 6, and a control signal output section 7
A diode 12 having a cathode connected to the pulse input section 1 side 4 and an output side 9 of the constant voltage section 3 are connected between the output side of the control section 8 and the pulse input section 1 and the output side of the constant voltage section 3.
and a pull-up resistor 13 connected to the diode 1.
2 and a pull-up resistor 13 are connected to the signal input section 6 of the control section 8. It is characterized by inputting the following information. The pulse sending side may be connected to the signal processing device via a transmission line and located at a remote location, or may be integrated with the signal processing device. The pulse signal may be any signal that allows the discriminator 11 to discriminate between binary signals, that is, the output voltage value of the constant voltage section 3 will be the intermediate value of the voltage difference between the signal to be detected and other signals. Any pulse signal may be used.

(effect) The operation of the present invention will be explained.

A pulse signal input to the pulse input section 1 from the pulse sending side is first rectified and smoothed by the constant voltage section 3 and output as a DC voltage (the output voltage value at this time is equal to the pulse signal input to the pulse input section). This is the intermediate value between the high voltage value and the low (including negative) voltage value of the signal. This DC power is input to the power input section 5 and becomes the power source for the control section 8. Also, the pull-up of the discriminating section 11 The above DC voltage is always applied to -@9 of the resistor 13. Here, since the voltage on the pulse input section 1 side 4 changes over time, there are times when it is higher and times when it is lower than the DC voltage 4. However, at high times, no current flows through the pull-up resistor 13 despite the high voltage on the pulse input side because of the presence of the diode 12.

Therefore, the voltage value at the midpoint 14 is the same potential as the DC voltage, and the DC voltage is applied to the signal input section 6.

At times when the voltage is lower than the DC voltage, the diode 12 is in the forward direction with respect to the current direction, so the current is 9, 13, 14.
, 12, 4, 1. 2 (numbered in FIG. 1), and therefore no voltage is applied to the signal input section 6.

In this way, due to the difference in voltage value for the signal input section 6,
The control section 8 processes the pulse signal as data, and the constant voltage section 3
Using the output as a power source, a control signal is output from the control signal output section to the load side.

(Example) A first example of the present invention will be described with reference to FIGS. 2 to 9. The first embodiment shown in FIG. 3, which differs from the prior art shown in FIG. 12 only in the discriminating section 11 and other parts are the same and will not be described here, is a load control device, and the central Processing device 21, operation switch 23, terminal device 22
a to 22n are connected by a two-wire transmission line 2, and each terminal device 2
28 to 22n have loads 24a to 24 such as lighting, respectively.
d is connected. Each of the terminals 22a to 22n and the operation switch 23 have a unique address, and the pulse group A (start C, mode D, address E, data ", check sum") of the transmission signal (FIG. 11) from the central processing unit. G) is received (Fig. 4 (A)), if it is the own address (Fig. 4 (B)), then the data [ is determined (Fig. 4 (A)).
outputs a control signal to the load (e.g. relay)
Figure 4 (e)). In addition, mode D is a 4-bit pulse signal, and there are 4 combinations of modes for controlling the terminal (doing or not) and sending control data from the terminal (sending, not sending).
In the mode of sending control data, the designated terminal device carries the data and sends it back to the central processing unit (the above is the operation of the control unit 8). .Explanation of parts common to FIG. 3 will be omitted.

Reference numeral 31 denotes a return signal circuit that is driven when data is returned from the terminal device to the central processing unit, and sends 0 and 1 signals to both ends of the diode bridge 3a according to the output of the terminal 50 of the control section 8. This is expressed as a short circuit (on or off), and is incorporated into B in FIG. 11 as a change in current value to be identified by the central processing unit.

32, 33, 34. , 35 are a reset circuit, an oscillation circuit, an address setting depth switch, and a drive transistor, respectively.

As shown in the figure, the control signal output of the control section 8 is an 8-bit output, of which 4 bits are sent to the drive transistor 35 and the 4 bits are fed back to the control section 8 to be treated as return data.

42a-42d and 41a-. 41d has four relay circuits, 41a to 41d are supplied with power from a power supply 36, a diode bridge 37, and a smoothing capacitor 38, and 42a to 42b are supplied with power from a power supply 43 and a load. The loads 24a to 24d are connected to each other, and each load 24a to 24d is turned on or off as desired by a signal from the drive transistor 35 to 4 bits 1.

3 to 9 regarding the operation of the discriminator 11 of this embodiment.
This will be explained with reference to the figures.

Figure 5 shows the waveform of the voltage between ■ and ■ in Figure 3 with ■ being OV, and Figure 6 shows the voltage between ■ and ■ in Figure 3 with ■ being OV.
Figure 7 shows the waveform when the voltage between ■ and ■ in Figure 3 is taken as OV, and Figure 8 shows the waveform when the voltage between ■ and ■ in Figure 3 is taken as OV.
FIG. 9 shows a waveform of the voltage between (1) and (2) in FIG. In all cases, the horizontal axis is time, the vertical axis is voltage, and in the timetable sections in each figure, the portion a indicates the same time zone (the same applies to the portion b). Also, in Figures 5 to 7, 0.6 to 1. ○The difference in V is due to the diode voltage. This is a voltage drop due to voltage drop, and the waveform in Figure 8 is actually 0.6 to 1.0 lower than 24V (dotted line) (VD
(excluding D).

Then, a bipolar pulse of ±24 is input to ■ and ■ (Figure 5).
, a DC voltage is output by the diode bridge 3a (Fig. 8), and the peak portion of this DC voltage output is cut by the stabilized power supply circuit 3b to obtain a stabilized constant voltage (Fig. 8).
Figure VDD). The determination unit 11 determines that V DD = 5 V
is used as the reference value, so in this example, from FIG. 6,
At time a, +5V is generated as shown in FIG. 9, so a voltage is applied to the signal input section 6.

Hey, put the cathode side of diode 12 at 1 instead of 1a.
When connected to b, the waveform as shown in FIG. 7 is opposite to that in FIG. 6, so that 1-5 is generated at time b. In this case, for example, an inverter circuit may be provided in the signal input section 6 of the control section 8.

In this embodiment, as shown in FIG. 10, the pull-up resistor is schematically placed outside the control section (LSI) 8, but it is actually built into the LSI.

[Effects of the Invention] The signal processing device of the present invention discriminates between pulses having different voltage values input to the pulse input section by comparing the pulses with the output voltage of the constant voltage section which rectifies the pulses.

The output voltage value of the constant voltage section (is rectified and becomes the intermediate input to the pulse input section, so pulse discrimination is reliable. Also, as a discrimination section, there is a pull-up on the constant voltage section output side. A diode with a power sword connected to the resistor and voltage input section is provided, and the intermediate point between the pull-up resistor and the diode is connected to the signal input section of the control section, which determines the presence/absence of the control output based on the presence/absence of voltage. Since a simple structure is sufficient, there is no need to use a Zener diode, etc., which is more expensive than a diode, and an inexpensive device can be provided. Since only the constant voltage section applies the same voltage as the power supply voltage of the control section, the control section can be
When the device is constructed using an integrated circuit such as C, the pull-up resistor can be easily incorporated into the integrated circuit, so manufacturing and component costs related to the device can be reduced.

[Brief explanation of drawings]

Fig. 1 is a partial block diagram showing the basic structure of the present invention, Fig. 2 is an overall view of an embodiment of the present invention, Fig. 3 is a circuit diagram showing the main parts of the same, Fig. 4 is a flowchart showing the same processing operation as above, FIGS. 5 to 9 are diagrams showing signal waveforms as above, respectively, and FIG. 10 is a circuit diagram specifically showing the main parts of above,
Fig. 11 is a diagram showing the pulse signal waveform used in the above,
FIG. 12 is a circuit diagram showing the main parts of the conventional device. 1... Pulse input section, 3... Constant voltage section, 5...
Control unit, 6... Signal input unit, 7... Control signal output unit, 8... Control unit, 11... Discrimination unit, 12...
Diode, 13...Pull-up resistor.

Claims (1)

[Claims] (1) A pulse input section into which a pulse signal whose voltage value changes over time is input; A constant voltage section that rectifies and smoothes the pulse signal from this pulse input section; The output of this constant voltage section is input as a power source. a control section having a power input section, a signal input section, and a control signal output section that outputs a control signal based on the input voltage of the signal input section; interposed between the output side of the pulse input section and the constant voltage section; death,
a discriminator that outputs a binary signal to the signal input section according to the level of the voltage input to the pulse input section; and the discriminator is connected such that the pulse input section side becomes a cathode. 1. A signal processing device comprising a diode and a pull-up resistor connected to a constant voltage section output side of the diode, and a midpoint between the diode and the pull-up resistor connected to the signal input section.