JPS6134613A - Driving device - Google Patents

Abstract

PURPOSE:To decrease the number of output lines of digital circuit part, and also to simplify the circuit by connecting a load of a series circuit and a connecting part of a driving circuit, and a load of other series circuit and a conecting part of a current limiting resistance, through a diode in each separate series circuit. CONSTITUTION:Loads 5, 6 display a sound volume operation, and for instance, when a key switch of a large sound volume of a key input part 17 is operated, outputs A, B and C of a microcomputer 1 become ''0'', ''1'' and ''0'', and as soon as the display use load 6 is driven, a magnetic tape sound recording and reproducing device 21 which has received signals of ''0'', ''1'' and ''0'' makes a sound volumne large gradually. When a necessary sound volume is obtained, an operator stops operating the key switch. As a result, the outputs A, B and C all become ''0'', and as soon as the load 6 comes not to be driven, a sound volume variation of the device 21 stops, as well. The case when the sound volume is small is all the same. Also, as for the sound recording operation, there is such a danger as the contents of a sound-recorded tape are erased by mistake, therefore, in case when said operation has been executed, it is displayed as a load 7 or informed by using a load of a sounding function.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device that drives a load using an output signal from a microconbeater or a general digital circuit.

(Conventional Structures and Their Problems) In recent years, with the development of microconverters, LSI technology for digital circuits, and development of gate arrays, electrical and electronic devices have become increasingly digitalized. Also, AIDC
By using a D/A (digital signal to analog signal) converter, the digital circuit performs analog signal processing and also outputs a drive signal for the load. When a digital circuit processes signals or information, for example, if it has four signal terminals, it can process 16 types of signals as 4-bit information. However, when driving a load, only one load can be driven with an I signal, and compared to information processing, driving a load requires many signal lines. There has been an increasing demand for more efficient terminals.

FIG. 1 shows a conventional example. The loads 5, 6.7 are driven by the opening/closing parts 8, 9.10 opening and closing, respectively, in response to the output signals A, B, C of the microcomputer 1 (IQ I+, +111+). 2,3゜4 is a current limiting resistor. In this case, three outputs A, B, and C are required to drive three loads. Here, outputs A, B, and C are binary signals. If so, two loads or three loads may be driven simultaneously, and the first
It is shown in the table.

As is clear from the explanation above in Table 1, when multiple loads are selectively driven at the same time without being driven at the same time, and a binary signal is required, in the conventional example, the drive signal for the load and the information transmission are Since the binary signals cannot be made the same, an output for driving a load and an output for transmitting information are required, and a large number of output terminals are required.

(Object of the Invention) The present invention provides a drive device that inputs an output as a binary signal and does not require the addition of a gate circuit in order to reduce the number of output lines of a digital circuit section.

(Structure of the Invention) In order to achieve this object, the drive device of the present invention includes a series circuit in which a current limiting resistor is connected to one end of a load having directionality in the drive voltage, and a drive circuit is connected to the other end of the load. Equipped with multiple pieces. Then, to the connection portion between the load and the drive circuit in each series circuit, the connection portion between the load and the current limiting resistor in the other series circuits is connected via a diode for each series circuit.

This reduces the number of outputs of the cidigital circuit and simplifies the circuit by sharing the binary signal and the load driving signal.

(Description of Embodiment) A driving device in an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a main body 21 of a magnetic tape recording and reproducing apparatus and a remote control unit 20 are connected by a cable 18 to perform remote control. The remote control section 2Q consists of a circuit section 19 and a key manual section 17 obtained by applying the present invention to the conventional example shown in FIG. The key operator section 17 has seven key switches, which are used to operate "stop,""play,""fastforward,""rewind,""record,""volumeup," and "volume down," respectively. Outputs A, B', C7d of microcomputer 1
If there is no key manpower, it is all II OII. . If there is key human power, outputs 3 from A, B, and C in response to that input.
A bit signal is output. When key operation is stopped and the key power is no longer available, outputs A, B, and C all return to It O7.
Becomes 1. The main body 21 operates in response to a 3-bit signal sent from the remote control section 20. Table 2 shows the relationship between each function, outputs A, B, and C and driven load.

Table 2 The relationship between the outputs A, B, and C and the driven load will be explained below.

Now, when the output A of the microcomputer 1 is II 171, the opening/closing section 8 becomes a closed circuit state and drives the load 5. On the other hand, since only the forward voltage of the diode is applied to the load 7 by the diode 11, the load 7 is not driven regardless of whether the switching section 10 is open or closed. Similarly, the load 6 is not driven by the diode 12 either. In other words, if each switching section is in a closed state, it has the effect of interfering with the driving of loads connected to other switching sections. Therefore, in order for the load to be driven, only one switching section must be closed, and Table 2 is established.

The loads 5 and 6 are for displaying the volume operation; for example, when the "volume high" key switch of the key manual section 17 is operated, the microcomputer 1 outputs A and B.

C becomes 0,1.0" and at the same time drives the display load 6 to indicate that the "volume high" is being operated, the main body 21 receives the "o, i, o" signal and turns the volume up. gradually increases. The operator stops operating the key switch when the desired volume is reached. Then the output A, '+B,
C is all set to 0, and at the same time the load 6 becomes non-driven, the volume changes in the main body 21.

The same applies to the "volume rate". Furthermore, since there is a risk that the recording operation may erase the contents of the recorded tape by mistake, if such an operation is performed, the operator is notified by displaying the load 7 or by using the load of the sound generation function.

Next, when the conventional example shown in FIG. 1 is used for the circuit section 19, Table 3 is established, and this is clear from the contents already explained in the conventional example.

When the conventional example shown in Table 3 is used, for example, when a "fast forward" operation is performed, "volume loud" and "volume rate" are displayed at the same time, resulting in an inconvenience. Therefore, in order to achieve the same effect as the embodiment shown in FIG. 2 using the conventional example, the microcomputer 1
Outputs A, B, and C are used exclusively for driving the load, and a 3-bit signal connected to the cable 18 must be output from another terminal. This means that the number of terminals of the microcomputer 1 increases, resulting in an extremely large and expensive system.

As explained above, in the conventional example, there is a one-to-one correspondence between the drive of the load and the output of the microcomputer 1.
Although there are three outputs (A, B, C), it is limited to three types of output states.

The output of the inscribed number of the outputs A, B, and C is II 1. I
State I cannot be used. In the embodiment shown in FIG. 2, the output is A.

B and C can be used as binary signals, and the efficiency of the output terminal of the microcomputer 1 can be improved.

(Effects of the Invention) As described above, the present invention includes a plurality of series circuits in which a current limiting resistor is connected to one end of a load whose drive voltage has directionality, and a drive circuit is connected to the other end of the load. By connecting the connection between the load and drive circuit of a series circuit and the connection between the load and current limiting resistor of another series circuit through diodes for each series circuit, the signal that was conventionally used as a drive signal for the load can be converted into a binary signal. It is possible to use the same signal line to not only drive a load but also generate input signals and control signals for other circuits.It is possible to reduce the number of signal lines, that is, the output terminals of the circuit. It is possible to simplify the cutout circuit.

In the embodiment shown in Fig. 2, all combinations of the connection between the load and the drive circuit and the connection between the load and current limiting resistor of other series circuits are connected via diodes, but by selectively connecting them. It is also possible to drive multiple loads simultaneously, and the correspondence between signals and load drives can be freely set.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example in which a load is driven by a microcomputer. FIG. 2 is a circuit diagram showing an embodiment of the present invention using the same signal lines as in FIG. 1, having the same functions, and making it possible to use the signal lines as a binary signal. 1... Microcomputer, 2, 3.4... X flow limiting resistance, 5, 6.7... Load, 8, 9.10...
・Opening/closing part, 1.1, 1.2, ], 3, 14
, 15 , 16... Diode, 17... Key human power section, 18... Cable, 20... Remote control section, 21
...Magnetic tape recording and playback device O Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1

Claims (2)

[Claims] (1) A plurality of series circuits are provided in which a current limiting resistor is connected to one end of a load having directionality in the drive voltage, and a drive circuit is connected to the other end of the load, and a connection portion between the load of the series circuit and the drive circuit is provided. A drive device characterized in that a load of another series circuit and a connection portion of a current limiting resistor are connected to each other via a diode. (2) The load whose drive voltage has directionality is a combination of a load whose drive voltage does not have directionality and a load or element whose drive voltage has directionality (
1) The drive device described in item 1).