JPH0711032U - Photocoupler test equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a photocoupler test device, and in particular, compares the input signal to the photocoupler unit with the output signal from the photocoupler unit to ensure simple and reliable operation of the photocoupler unit. Characterized by testing. [Structure] The photocoupler testing device according to the present invention is configured such that the input signal (2a) and the output signal (5a) of the photocoupler unit (3) are the first.
Comparing with the gate circuit (10), if they match, photo coupler
The display light emitting unit (8) blinks because (3) is normal, and if they do not match, the display light emitting unit (8) lights up because the photocoupler unit (3) is faulty and the normal and faulty This is a configuration that facilitates identification.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a photocoupler test device, and particularly to a novel device for comparing the input signal to the photocoupler unit with the output signal from the photocoupler unit and testing the operation of the photocoupler unit easily and reliably. Regarding improvement.

[0002]

[Prior art]

 As a conventional test apparatus for this type of photocoupler unit, the configuration shown in FIG. 2 is generally adopted, and the 0.5 Hz drive signal 1a from the pulse generation circuit 1 is supplied to the first buffer. The output signal 5a from the photodetector 5 of the photocoupler unit 3 is input to the coupler light emitting unit 4 of the photocoupler unit 3 via the card 2 and the display light emitting unit of the panel 7 via the second buffer card 6. It is entered in 8. Therefore, when a current flows through the photocoupler unit 3, the display light emitting unit 8 blinks at this frequency according to the frequency (0.5 Hz) of the drive signal 1a.

[0003]

[Problems to be solved by the device]

 Since the conventional photocoupler test device is configured as described above, there are the following problems. In other words, when the photo coupler unit is operating normally, the display light emitting unit blinks, and when the photo coupler unit fails, the display light emitting unit turns off. If it becomes normal again for some reason after a while, for example, if the inspector who checked happens to check the normal state after this failure, it may be the photo coupler section that has failed. Instead, the product was judged to be non-defective, which actually caused a failure after shipping.

The present invention has been made to solve the above problems. In particular, the operation of the photocoupler unit is compared by comparing the input signal to the photocoupler unit with the output signal from the photocoupler unit. It is an object of the present invention to provide a photocoupler test device that allows easy and reliable testing.

[0005]

[Means for Solving the Problems]

 The photocoupler test apparatus according to the present invention includes a first and second drive signals output from a pulse generation circuit, a light emitting section for a coupler of a photocoupler section which receives the first drive signal as an input signal, and a photocoupler section. A light receiving portion provided for outputting an output signal, a first gate circuit for inputting the input signal and the output signal, a first output of the first gate circuit and the second drive signal are input. And a display light emitting unit for inputting the second output of the flip flop circuit via an inverter, and a flip-flop circuit connected between the output end of the photocoupler unit and the input end of the display light emitting unit. A second gate circuit, and the display light emitting unit is in a lighting state when the input signal and the output signal do not match, and blinks when the input signal and the output signal match.

[0006]

[Action]

 In the photocoupler test apparatus according to the present invention, the input signal and the output signal in the photocoupler section are compared by the first gate circuit, and the first output from the first gate circuit and the second drive signal from the pulse generating circuit are flip-flopted. Since the input signal is input to the monitor, the display light-emitter repeats blinking at 0.5Hz when the input signal and output signal match. When the input signal and the output signal do not match (when the photo coupler is out of order), the output of the inverter connected to the second output of the flip-flop circuit becomes LOW, and the display light-emitting part continuously lights up. Becomes Therefore, when the photocoupler unit fails, the display light emitting unit is turned on, and it is easy to find the fault no matter what the check time.

[0007]

【Example】

 Hereinafter, a preferred embodiment of the photocoupler testing apparatus according to the present invention will be described in detail with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals. A reference numeral 1 in FIG. 1 is a pulse generating circuit, and the 0.5 Hz first drive signal 1a from the pulse generating circuit 1 is passed through the first buffer card 2 as an input signal 2a to the photo coupler unit 3a. The output signal 5a from the photodetector 5 of the photocoupler 3 is input to the coupler light-emitting unit 4 and the display light-emitting unit 8 of the panel 7 is passed through the second buffer card 6 having the second gate circuit 6a composed of NAND. Has been entered in.

Further, the input signal 2a and the output signal 5a are input to a first gate circuit 10 composed of an EX-OR, the first input 10a of which is input to a D terminal 11a of a flip-flop circuit 11 and its T The second drive signal 1b of 1 Hz from the pulse generation circuit 1 is input to the terminal 11b.

A reset signal 12 is input to the R terminal 11c of the flip-flop circuit 11 so that resetting is performed when the power is input and the reset switch is turned on. The two outputs 11e are connected to the panel 7 via the inverter 13. Therefore, the abnormality detection circuit 14 is composed of the first gate 10, the flip-flop circuit 11, the inverter 13 and the like.

Next, the operation will be described. First, when the photocoupler unit 3 is operating normally, it is found that the input signal 2a and the output signal 5a are the same at the first gate 10, the inverter 13 becomes HIGH, and the second buffer card 6 outputs Displayed by output The light emitting unit 8 repeats blinking at 0.5 Hz. Further, when the photo coupler unit 3 is out of order, the output from the inverter 13 becomes LOW and becomes 0V, and the display light emitting unit 8 is continuously turned on.

[0011]

[Effect of device]

 Since the photocoupler test device according to the present invention is configured as described above, the photocoupler section blinks when normal and lights up when there is a failure, making it easy to find a failure and finding an intermittent failure due to spontaneous recovery. It will be easier.

[Brief description of drawings]

FIG. 1 is a block diagram showing a photocoupler test apparatus according to the present invention.

FIG. 2 is a block diagram showing a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pulse generation circuit 1a, 1b 1st, 2nd drive signal 2a input signal 3 photocoupler part 4 light emitting part for coupler 5 light receiving part 5a output signal 8 display light emitting part 10 first gate circuit 10a first output 11 flip-flop circuit 11e Second output 13 Inverter

Claims (2)

[Scope of utility model registration request] 1. A first and second drive signals (1a, 1b) output from a pulse generation circuit (1) and a photocoupler section (3) using the first drive signal (1a) as an input signal (2a). ) For the coupler light emitting section (4) and the output signal (5
a light receiving part (5) for outputting a), a first gate circuit (10) for inputting the input signal (2a) and the output signal (5a),
A flip-flop circuit (1) for inputting the first output (10a) of the first gate circuit (10) and the second drive signal (1b)
1) and the second output (11e) of the flip-flop circuit (11)
Display light-emitting part for inputting via the inverter (13)
(8) and a second gate circuit (6a) connected between the output side of the photocoupler section (3) and the input side of the display light emitting section, and the input signal (2a) and the output signal A photocoupler test apparatus, characterized in that the display light emitting section (8) is in a lighting state when (5a) does not match, and blinks when the display light emitting section (8) matches. 2. The photocoupler test apparatus according to claim 1, wherein the first gate circuit (10) is composed of an EX-OR, and the second gate circuit (6a) is composed of a NAND.