JPS5955531A - On/off signal input device - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution and to decrease the number of elements of a controller, by making use of the resolution of an A/D converter to feed a number of ON/OFF signals directly to a digital data processor. CONSTITUTION:The resolution of an A/D converter is utilized to feed a number of ON/OFF signals directly to a digital data processor without performing timing control or selection control. For instance, the reference voltage Vs is supplied to a D/A converting circuit network D/A consisting of input switches S1-S5, resistances R-32R, an addition amplifier SIGMA, etc. At the same time, the digital signals corresponding to the ON/OFF signal sent from an operation switch, a detection switch, etc. are supplied via the switches S1-S5 and converted into analog signals. This analog signal is converted into a digital signal by the network A/D and fed to a control part 20 of the digital data processor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an on/off signal input device for inputting numerous on/off signals output from operation switches, detection switches, various detection devices, etc. to a digital data processor. In the future, by utilizing the resolution of the A/'D converter circuit, it will be possible to convert a large number of on/off switches into one (, f-connection digital data iron I Jjll) without timing control or selection control. , 1, the circuit configuration was simplified to 111, and the control device was designed to reduce the number of electrons in the ellipse.

Conventionally, as a method of manually inputting the multiple on/off signals output from the operation switch, detection switch, and each persimmon detection switch to the control eye that digitally processes them, (1) the control device (Digital Data Department 1114 system) has been used. R
) method of assigning one on/off signal to each input J terminal.

(2) Method using diode matrix.

(3) Method using a multiplexer.

etc. have been proposed.

However, the method of assigning one ON/OFF signal to each control device input in (1) above requires human power in the same number of switches as there are switches. The moxibustion control device white is applicable 1 or 11<1.

”-For example, in the case of a matrix of s, t, +x+, the diode matrix method described in (2) uses 4 scanning lines and 4 input lines to create a maximum of 16 on/off lines.
Off signal can be manually operated, 8 inputs and outputs 1
In addition, in the case of an 8x8 matrix, using 8 scanning patterns and 8 human power lines, the maximum 641
In addition, it is possible to input on/off signals, and a total of 16 input/output terminals are used, but this method requires a large number of diodes, and in cases where the control unit and switch are long, etc. Due to the floating resistance and inductance of the lead wire, scanning using high-speed pulses is the only option.
When detecting the switch-on timing, there is an error corresponding to the scanning cycle (&i-1, not l/).

In addition, the method of using a multiplexer of 1t11 fft', <3 is (Target is, when the signals of the two control line bits are manually transmitted to one person/J terminal end),
When inputting an 8-bit signal to the input terminal of l fli'!1 using three control lines using the input/output terminals of If you use 4 fltll?il:h] and input a 6-bit signal to one input terminal, you can use 5 input/output terminals or The disadvantages are that the number of elements increases and the cost increases.Historically, a common disadvantage of the two sets (1) to (3) is that in a noisy environment, the input line of the control unit For peace of mind, use a noise prevention filter circuit for each case, especially (3) above.
In this case, considering protection against destruction of the multiplexer, there were drawbacks such as requiring the same number of noise prevention filter circuits as the number of switches.

In digital data processing devices, data is processed at 1.0, so when inputting data,
It is necessary to input data with 1 and O. Therefore, in order to input a large amount of data to one input terminal, the above (2)
As in the methods (3) and (3), selection control is required to control the timing of reading data and to select one of a large number of inputs.

The present invention was made in view of the above-mentioned circumstances, and
In particular, by utilizing the capability of the A/D converter, it is possible to manually input a large number of on/off signals to the interview digital data processing device 6 for timing control and selection control, thereby improving the circulation system. simplifies the configuration and
This is done without reducing the number of control elements.

FIG. 1 and FIG. 2 respectively show the embodiments of the present invention.
11. l! In the diagram, D/A is a digital/analog conversion circuit network, A/D is an analog/digital conversion circuit network, and 10 is a control unit (digital data processing unit). ), 20 is a microcomputer, and the embodiment shown in FIG.
The 6QI section 10 is composed of a one-chnob microcomputer 20 with a built-in digital/analog conversion circuit, and as shown in the figure, on/off signals from operation switches, detection switches, etc. are converted into analog signals by a D/A conversion circuit. This analog signal is converted into a digital signal by the A/D conversion circuit G and input to the digital data processing device (control section).
The number of states of digital data sent to the control unit is up to 19I! depending on the resolution of the digital conversion circuit. There is.

For example, in a 4-bit A/D conversion circuit, the upper limit is 256. In a 16.8-bit A/D conversion circuit, the upper limit is 256.

Therefore, the number of on/off signals input to the D/A conversion circuit is determined by the number of on/off signals that are input to the D/A conversion circuit.
If the number of states that can be generated by the g-conversion circuit is exceeded, the on-state
It becomes impossible to manually send the off signal to the control unit correctly. Therefore, when the number of input signals is large, it is necessary to use a plurality of D/A converters to expand the number of inputs. Therefore, when using D/A converters, the output of each D/A converter is input to a different channel of the A/D converter, so it is possible to expand the number of A/A converters. //Up to the number of input channels of the D converter. The connection between the A/D converter and the control unit is a line for transmitting digitized data, and the operation of the A/D converter, for example, input channel switching, analog signal sampling, etc. )?
It consists of +41 plus 1 and +41, and therefore,
There are input lines and output lines other than those shown in the drawings to the control unit, and the entire system includes these lines. Also, the first
The A/D conversion circuit and control circuit 6 are shown in Fig.
For the central part, it is possible to use the known one as is, but for the D/A conversion circuit, phase I of the human signal: TI
It is necessary to use different circuits depending on the relationship, purpose, etc., and the circuit is configured as shown in FIG. 3 or FIG. 4, for example.

FIG. 3 is an electric circuit diagram for explaining an example of a 7/A converter circuit used in carrying out the present invention. 8.2n resistors are connected in series, and input switches SL, S21 . It is connected by SrS...Sn. In this way, the voltage at each connection point is as shown in the figure, ]-/2 VS, 1/4 VS, Ko, /16
Vs...4/2" Vs (However, in Figure 3, n
= 5). Come on, switch 8 now.
If 1 to S5 are considered to be paired with 15 for each binary digit, the combination of states of each switch corresponds to a binary value, and the output of the booster amplifier Σ becomes an analog value corresponding thereto. Therefore, according to this embodiment, it is possible to determine all combinations of on/off of switches 81 to S5, but not only that, but also the on/off combinations of switches 81 to S5 can be determined.
It is possible to detect the timing of the off-state and the simultaneous on or off of a plurality of switches with the resolution of the reading interval of the A/D conversion circuit. Since the reading interval of this A/D conversion circuit can be made faster than the scanning pulse interval of the diode matrix, the reading error in the timing of switch on/off event occurrence is reduced. . In the illustrated example, the number of inputs is five, but the theoretical upper limit is the same as the number of bits of the A//D conversion circuit.

However, in practice, the number of bits in the A/D conversion circuit is 1
It is convenient to reduce the number of inputs to a small number of bits, and in this way, when the control unit determines the input state, it is possible to have a margin equivalent to the focus between the two and the accuracy of the resistance value of the circuit network. It has the advantage of being able to drop. - FIG. 4 is an electric circuit diagram for explaining an actual example of another D/A conversion circuit, but this implementation 1911 is
While the embodiment shown in FIG. 3 is of voltage control type,
It is a current control type.

In FIG. 4, each transistor Tri"-'1:'r
A voltage that compensates for the temperature characteristics of the transistor is applied to the base of a by a constant voltage element and a diode.
Each transistor Tri to Tr4 has a resistor f2R,4
A current determined by R and 8R flows. However, when the switch is on, the current flows through the switch rather than through the transistor, or because the collector circuit of the transistor is common, the total current becomes the sum of 'r1□. This sum of current is converted into a current and a voltage by an amplifier 111Mj, buffered, and output as an analog 711Mj. Switches S1, S2...S4 have one core for each binary digit, and their functions are shown in Figure 3.
It is the same as the embodiment described above, but the feature is "C". Since the switch is one power or the ground, a transistor switch etc. can be used instead of the switch shown in the figure.
? It is to be.

FIG. 5 shows the overall direction 't?' when the switch is replaced with a transistor switch. FIG. 6 shows a partially detailed circuit example corresponding to FIG. 4. In the figure, 80 is an analog switch, 40 is an R-2R ladder network,
As shown in FIG. 6, a resistor Rc for applying a collector bias is connected to the collector of the transistor Trn, and the resistor Rc is connected to a power supply Vcc. Note that the diode D is for preventing the current flowing through the resistor Rc from flowing into the circuit of the resistor 2nR when the transistor switch is off. Furthermore, by setting the voltage Vcc to be the same as or higher than VS, it is possible to prevent current from flowing through the path of the resistor 2''R and the diode D1 and the resistor Re when the transistor switch is off. Therefore, such a circuit configuration is applicable not only to the transistor switch but also to the actual circuit configuration shown in FIG. 4.For example, in the circuit of FIG. In cases where the resistance becomes high and there is a possibility that the contact of the switch becomes unstable, the problem of poor contact can be solved by inserting an appropriate resistance into the resistor Rc. In addition, V in range 1-11 that does not exceed the reverse breakdown voltage of Dimate D
It is also possible to raise the Ichikawa value of the cc so that the switch can reach the unstable timing of the carp.
Did you show an example using the R-2R ladder network?
In the case of low switching, the analog switch is controlled by the input signal, using the transfer method as the starting point for the human input signal. This Fl-2R
Since the ladder network has a resistance value of 2 9" 1 (J is 41), it is easy to obtain resistance, and it is immovable when the number of human isosities, that is, the number of binary digits, is large. It is.

As mentioned above, each embodiment of the present invention has been explained c)1;
In the embodiment shown in FIG. 5, a human character is used for each binary digit, including all the combinations of ``rut 1'', ``seven'', and switch operation ``1''. "Kame" is Noh.

As is clear from the explanation below, according to the present invention, by utilizing the function W-(J1J) of the A/D conversion circuit, timing control and continuous selection control are not performed. A large number of on/off signals can be input directly to the digital processing device, and therefore, the circuit (II'l structure) can be reduced to a firi element, and the number of elements in the control device can be reduced to 6.t□. be.

[Brief explanation of drawings]

11th 1 and 2 are electrical blocks for detailed explanation of the present invention, respectively. Revision of A conversion circuit: Hosobu, air circuit diagram, No. 1 is an electric block diagram showing an example of the case where the present invention is configured using an analog switch, and Fig. 6 is an electric block diagram showing an example of the case where the present invention is configured using an analog switch. This is a partial detailed circuit diagram. D/A ・Digital-to-analog conversion circuit network, A/D...
Analog-to-digital conversion circuit network, 10-: 1 part on the l1ll side, 20. Microcomputer, 30.. Analog switch, 40.. T'1-2R ladder network. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (''), a digital boolean processing device that converts the on/off signals output from operation switches, detection switches, various detection devices, etc. into an on/off signal that cannot be manually operated. person/J
There is a device, and the input device @ heart j', z converts the on/off one word from an analog signal to a digital signal.D
/A conversion circuit network] and an A/D conversion circuit network for converting an analog signal from the D/A conversion circuit network into a digital signal, and An on/off signal input product characterized by manually inputting false information to AiJ's digital data processor tM. (2), +f Note: The A/D conversion circuitry and digital data processing 1filtration is a one-chip microconverter with a built-in A/'D conversion circuit. The on/off signal input device described in item (g) of the scope of the request.