JPH0611508Y2 - PNPN switch sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for selecting a PNPN switch having a TO-92 outer shape, and more particularly to a device for selecting a short circuit between electrodes, a leak current, or the like.

[Prior Art] As shown in FIG. 8, a PNPN switch 4 is a static characteristic switch having an S-shaped negative resistance in which a forward region and a reverse region of a rectifying element having a PN junction are connected by a negative resistor. As shown in FIG. 7, the device is a thyristor circuit classified as a reverse blocking two-terminal thyristor, and has an anode electrode 1 and a cathode electrode 3. PNPN
In the switch 4, as shown in FIG. 6, when packaged into a product, in addition to the anode electrode 1 and the cathode electrode 3, a no-contact (NC) electrode 2 is added to form three terminals. That is usually done. The no-contact electrode 2 is electrically insulated from the anode electrode 1 and the cathode electrode 3.

Since the packaged PNPN switch 4 has a structure having three electrodes shown in FIG. 6, when the product is shipped, leakage between the electrodes 1, 2 and 3 in the forward and reverse directions is caused. The inspection of current selection and the presence or absence of short circuit is performed, and the good product and the defective product are selected based on the inspection result.

Conventionally, in this sort of sorting apparatus, for example, short-circuiting between electrodes and sorting of leakage current are independent sorting items, but the sorting principle of short-circuiting between electrodes and the sorting principle of leak current are the same. That is, the principle is to detect a current flowing when a certain voltage is applied between the electrodes and remove a large one as a defect.

[Problems to be Solved by the Invention] In the above-described conventional sorting device, for example, short-circuiting between electrodes and leak current, which are the same sorting principle, are independent sorting items. Therefore, it is equivalent to performing the same thing twice. It has the disadvantages of long sorting time and complicated structure.
Specifically, FIG. 3 is a diagram showing the principle of forward leakage current I _DRM sorting in a conventional sorting apparatus, FIG. 4 is a diagram showing the same backward leakage current I _RRM sorting principle, and FIG. It shows a figure. Reference numerals 6 and 9 are current detectors.
Especially in the case of short circuit between electrodes, the leakage current (I _DRM , I
It has a separate selection circuit 8 from the selection circuits 5 and 7 of _RRM ). Only when the above circuits 5, 7, and 8 are complete, it is possible to select the leak current and the short circuit between the electrodes. Therefore, the conventional sorting device has a drawback that the structure is complicated and the sorting time is long.

An object of the present invention is to provide a sorting device that solves the above problems.

[Differences from the Prior Art of the Invention] In contrast to the above-described conventional sorting apparatus, the present invention uses a plurality of items (for example, between electrodes) to be sorted according to the same sorting principle (for example, voltage is applied between electrodes to detect current). Short check,
Item that becomes a standard for leak current selection (leak current)
It has an original content of collecting multiple items at once and selecting multiple items at once with the selection items as the standard.

[Means for Solving Problems] In order to achieve the above object, a PNPN switch selection device according to the present invention is a PNPN switch selection device which has two selection circuits and selects whether a PNPN switch is good or bad. The PNPN switch is a switch element having an anode electrode, a cathode electrode, and a no-contact electrode electrically insulated from these electrodes, and the first selection circuit has a no-contact with the anode electrode of the PNPN switch. Detecting the current value when a voltage is applied between the short terminal and the connection terminal, which has a short terminal that short-circuits the electrode and a connection terminal that connects the cathode electrode independently of these electrodes. Therefore, the presence or absence of a short circuit between the no-contact electrode and the cathode electrode of the PNPN switch and the magnitude of the forward leakage current value And outputs a selection signal for the PNPN switch. The second selection circuit has a short terminal that short-circuits the cathode electrode and the no-contact electrode of the PNPN switch, and an anode electrode that is independent of these electrodes. By detecting the current value when a voltage is applied between the short-circuit terminal and the connection terminal, thereby determining whether or not there is a short circuit between the no-contact electrode and the anode electrode of the PNPN switch. The size of the reverse leakage current value is determined and the selection signal of the PNPN switch is output.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

The presence or absence of a short circuit between electrodes is related to the magnitude of the leak current value. That is, the PN not incorporated in the electric circuit
In the PN switch alone, the electrodes are electrically isolated from each other under normal conditions, and no leak current flows between the no-contact electrode and the anode electrode or the cathode electrode. When the electrodes are short-circuited, the current value in the circuit increases. Further, when a current leak occurs between the currents, the current value in the circuit increases.
In this case, paying attention to the current value, the inter-electrode short-circuit check and the leakage current selection can be performed simultaneously based on the magnitude of the current value.

Therefore, the device of the present invention has two sorting circuits 5 and 7.

As shown in FIG. 1, one of the sorting circuits 5 has a short terminal 5a for short-circuiting the anode electrode 1 and the no-contact electrode 2 of the PNPN switch 4 and the cathode electrode 3 independent of these electrodes 1 and 2. A connecting terminal 5b to be connected, and a voltage V
By detecting the current value when the _DM is applied by the detector 6, the presence or absence of a short circuit between the no-contact electrode 2 and the cathode electrode 3 of the PNPN switch 4 and the magnitude of the forward leakage current value are determined, and the PNPN The switch selection signal is output.

As shown in FIG. 2, the other sorting circuit 7 has a short terminal 7a for short-circuiting the cathode electrode 3 and the no-contact electrode 2 of the PNPN switch 4 and the anode electrode 1 independent of these electrodes 2 and 3. A connecting terminal 7b to be connected, and a voltage V
By detecting the current value when _RM is applied by the detector 6, the presence or absence of a short circuit between the no-contact electrode 2 and the anode electrode 1 of the PNPN switch 4 and the magnitude of the reverse leakage current value are determined, and the PNPN The switch selection signal is output.

FIG. 1 is a diagram showing a selection principle of an embodiment of the present invention. After short-circuiting the anode electrode 1 and the NC electrode 2, the voltage V _DM of the selection circuit 5 is applied between the anode electrode 1 and the NC electrode 2, and the current at that time is detected by the detector 6. FIG. 2 shows the same principle as in FIG. 1, short circuiting the NC electrode 2 and the cathode electrode 3 and then applying the voltage V _RM of the sorting circuit 7 between the anode electrode 1 and the detector 6 detects the current. is doing.

That is, in FIG. 1, the short-circuit between the NC electrode 2 and the cathode electrode 3 is checked at the same time as the forward leakage current I _{DRM is} selected, and in FIG. 2, the NC electrode 2 and the anode electrode are checked at the same time as the reverse leakage current I _{RRM is} selected. I'm checking for a short between 1. Therefore, the special block (FIG. 5) dedicated to the interelectrode short check is not required.

[Effects of the Invention] As described above, according to the present invention, the selection items having the same selection principle are unified into a certain reference item, so that the selection device can be simplified and the selection time can be shortened. In addition to being inexpensive, the number of man-hours for selecting the PNPN switch can be small, so that an inexpensive PNPN switch can be supplied.

[Brief description of drawings]

FIG. 1 shows a leakage current I _DRM and N showing an embodiment of the present invention.
Fig. 2 is a principle diagram for selecting a short circuit between the C electrode and the cathode electrode, Fig. 2 is a principle diagram for selecting a leak current I _RRM and a short circuit between the NC electrode and the anode electrode, and Fig. 3 is a selection diagram for the leak current I _DRM in a conventional selection device Principle diagram, FIG. 4 is a principle diagram for selecting a leakage current I _RRM , FIG. 5 is a principle diagram for selecting a short circuit between electrodes, FIG. 6 is a perspective view showing an outer shape of a PNPN switch, FIG. 7 is a circuit symbol diagram, and FIG. FIG. 8 is a waveform diagram showing static characteristics. DESCRIPTION OF SYMBOLS 1 ... Anode electrode 2 ... NC (no contact) electrode 3 ... Cathode electrode, 4 ... PNPN switch 5, 7, 8 ... Sorting circuit, 6, 9 ... Current detector

Claims (1)

[Scope of utility model registration request] 1. A PNPN switch selection device having two selection circuits and selecting whether a PNPN switch is good or bad, wherein the PNPN switch is electrically insulated from an anode electrode, a cathode electrode and these electrodes. The first selection circuit connects a short-circuit terminal that short-circuits the anode electrode and the no-contact electrode of the PNPN switch, and a cathode electrode that is independent of these electrodes. By having a connection terminal and detecting the current value when a voltage is applied between the short terminal and the connection terminal, the presence or absence of a short circuit between the no-contact electrode and the cathode electrode of the PNPN switch and forward leakage. The selection signal of the PNPN switch is output by judging the magnitude of the current value, and the second selection circuit is the PNP. When a voltage is applied between the short terminal and the connection terminal, the switch has a short terminal that short-circuits the cathode electrode and the no-contact electrode, and a connection terminal that connects the anode electrode independently of these electrodes. By detecting the current value of the PNPN switch, the presence / absence of a short circuit between the no-contact electrode and the anode electrode of the PNPN switch and the magnitude of the reverse leak current value are determined, and the selection signal of the PNPN switch is output. A PNPN switch selection device characterized by: