JPS5868320A - Solid-state relay device for alternating current - Google Patents

Abstract

PURPOSE:To prevent a triac from malfunctioning by providing a noise bypass capacitor between the conductor pattern and AC line conductor pattern of the diode bridge rectifying circuit of an AC solid-state relay device. CONSTITUTION:To constitute an AC solid-state relay device, a conductor pattern is formed on a conductive radiator with an insulator layer inbetween, and on the pattern, semiconductor elements such as an optical coupling element 14, a transistor 26, a full-wave rectifying circuit 18, and a triac 16, and passive elements such as a resistance and a capacitor are connected to form a circuit. A capacitor 28 is provided between the conductor pattern of the circuit 18 and the conductor pattern of an AC input terminal 12b, and a capacitor 29 is provided between the gate of the triac 16 and the conductor pattern of the terminal 12b. Consequently, a noise component accumulated in floating capacitance between the conductor pattern and radiator flows to the terminal 12b through the capacitors 28 and 29, thereby preventing the triac 16 from malfunctioning.

Description

DETAILED DESCRIPTION OF THE INVENTION Jin's invention relates to a hybrid type AC solid state relay device.

Hygri-Do Li's AC solid state relay devices, which handle large amounts of power, efficiently dissipate the heat emitted from the elements to the outside.
Generally, it has a cross-sectional structure as shown in FIG. That is, a conductive pattern 8 made of steel or the like is formed on a heat radiator 1 made of a conductive material through an insulating layer 2 made of a glass plate or a glass plate, etc. A circuit is constructed by connecting conductive elements such as try books, thyristors, transistors, and diodes to passive elements such as resistors and capacitors on the lead 1 using solder or the like.

This tight link is then sealed with an insulating resin and then covered with a metal lid to become an open space.

FIG. 2 is a conventional circuit configuration diagram of an AC solid state relay device having the above-mentioned cross-sectional structure.

In the cabinet, IJm, l1bFi, input terminal, 12a.

12kl-1 output terminal. The input terminal 11a.

At 11%, resistor 13 of the protective agent and optical coupling element L! A light emitting diode 15, which is a primary III, is connected in series. Also, the output terminal 12a.

JJb1%1ll (is connected between both ends of the triac 16, and one end of the triac 16 (output terminal 1
A resistor 11 is connected between the side 1b) and the side f-). Further, the one output terminal 11mK is connected to the diode 1, the anode of the diode 1# in the full-wave rectifier circuit u, and the cathode of the diode 2o, and the diode 2 in the full-wave rectifier circuit is connected to the dirt of the tri-book IC.
1 anode and a diode 220 cathode are connected. The cathodes of both diodes 19 and 11 are connected in common, and this connection point a is connected to the full-wave rectifier circuit -
One output terminal of
The seven nodes at .degree.22 are connected in common, and this connection point becomes the other output end. Between the two connection points -1b, that is, between the output terminals of the full-wave rectifier circuit, there is a series circuit consisting of a pair of resistors 113 and 14, and seven nodes of the optical thyristor 25, which is the secondary side of the optical coupling element port, and a cathode. are connected in parallel. - Also, the pace of the Lanzostar 26 is connected to the series connection point of the pair of resistors 23 and 24, and the collector of the Lanzostar 26 is connected to the optical thyristor xsoc-)K%? Nzosta lI
between the collector, the terminal, and the terminal, that is, the r of the optical Nyristor 15.
-) and a resistor sr is connected between the cathode and the cathode. Furthermore, a series circuit consisting of a surge absorbing resistor 21 and a capacitor xi is connected between both ends of the trier 160.

In a conventional circuit that does not have this configuration, the output terminal 11
An AC power source is connected between the input terminals 11m and 11% via a load circuit, and a predetermined DC voltage is applied between the input terminals 11m and 11%. Then, the light emitting diode 15 inside the optical coupling element emits light. Then, at the point when the AC voltage I[O voltage becomes 0, npm) land star 2- is turned off and the optical thyristor 2
Since the short circuit between the IO dart and the cathode is broken, the optical thyristor 25 is turned on for the first time at this point.

When the optical Nyristor 25 is tripped, a current flows through the trier, RI1iOr-) through the full-wave 11m circuit, and thereafter this trier, RI1#, is turned on, and a load current flows into the load circuit. That is, this circuit operates as a so-called zero cross AC solid state relay device.

By the way, as mentioned above, such a circuit is constructed by connecting each surface element on a conductor pattern provided on a conductive heat sink through an insulating layer, so each conductor pattern Stray capacitance exists between the heat sink and the heat sink. FIG. 3 is a perspective view specifically showing the state in which each surface element constituting the circuit shown in FIG. It is represented by As shown in FIG. 3, the output terminals JJa, JjbK
Equivalent conductor/4 turns 51, II2, triac 1
6? -) is connected to the conductor pattern 5J, conductor turns 54 and 55 corresponding to the connection point a#b, conductor pattern 56 corresponding to the connection point C, and the conductor to which f-) of the optical thyristor 25 is connected. Floating capacitances CI to C2 exist between each of the patterns 51 and the reference potential point. Therefore, when high-voltage O impulse noise mixes into the AC power supply and a negative potential is applied to the connection point b K4 @ the floating conductor pattern 5J, this potential is caused by the stray capacitance C existing at that point. Therefore, in this case, the cathode potential of the photothyristor pzio drops, and if the potential difference between the anode and cathode exceeds the withstand voltage in the H direction of the photothyristor 2J, the photothyristor 2J turns on and malfunctions. I will do it.

In other words, this malfunction is caused by the noise component passing through the full-wave rectifier circuit and being absorbed into the stray capacitance C, without being returned to the AC power source again.

This invention was made in consideration of the above-mentioned circumstances, and its main feature is that each gap is opened on a conductive pattern provided on a conductive heat sink with an insulating layer interposed therebetween. In an AC solid-state relay device in which a circuit is constructed by connecting elements, a noise bypass circuit is installed between the conductor leg turn that is the output end of the diode grid V-Z rectifier circuit and the AC #12-in O conductor leg turn. An object of the present invention is to provide an AC solid state relay device that can prevent malfunctions by connecting capacitor elements.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a circuit configuration diagram of an AC solid state relay device according to the present invention, and this circuit has a cross-sectional structure as shown in FIG. 1, similar to the conventional circuit. The difference between this circuit and the conventional circuit shown in FIG. 2 is that a noise bypass capacitor 28 is installed between the connection point, which is one output end of the full-wave rectifier circuit, and the output terminal 11b, which is the AC power line. Once connected, this capacitor 28 is connected between a pair of conductor patterns 52 and 55 in FIG.

By connecting the above-mentioned capacitor j8, high-voltage innocuous noise is mixed into the AC power supply, and even if a negative potential is applied to the connection point, this noise will be absorbed by the above-mentioned capacitor 2s.
It is fed back to the AC power supply via the AC power supply, and the potential line at the connection point does not change much = Therefore, even if the noise mentioned above mixes into the AC power supply, the optical Nyristor 21 will not malfunction, and the triac will be triggered (114%). Never.

In addition, by connecting capacitor 1# as shown in FIG. 4, and also connecting capacitor 29 between r-), -mandan, and 0 of the triac IC, the III) trigger of triac 16 can be more effectively controlled. It can be prevented.

Also, as a means to prevent malfunction of the circuit, it is good to reduce the value of each stray capacitance C1 to C1 shown in FIG.
4IK) Since the value of stray capacitance C*eCI between the conductor pattern 53 to which RIAC 1#'s r-) is connected and the conductor pattern 55 to which Optical Cylisk 150 Katudo is connected has the most influence on malfunction, Pattern JJ.

By reducing the sio* product, malfunctions can be more effectively prevented.

Note that this invention is not limited to the above-mentioned embodiments; for example, the secondary side of the optical coupling element is an optical silis! Although the case has been described, the secondary side may be of various types such as an optical transistor ('1)-). In addition, in the above actual travel example, we explained the case where a capacitor V28 for noise bypass is connected between the connection point S which is one output end of the full-wave rectifier circuit and the output terminal JJb. When the secondary side element of the optocoupler malfunctions when a positive potential is applied to the connection point a by
A capacitor for noise bypass may be connected between 2 and 2, and this capacitor is connected between a pair of conductor patterns 51 and 54 in the figure.

As explained above, according to the present invention, it is possible to provide an AC solid state relay device that can prevent malfunctions.

[Brief explanation of drawings]

Figure 1 is a cross-sectional structural diagram of a hybrid type AC solid state relay device, Figure 2 is a circuit diagram of a conventional AC solid state relay device, Figure 3 is a perspective view specifically showing the above conventional circuit, and Figure 4 is a diagram showing the circuit configuration of a conventional AC solid state relay device. The figure is a circuit configuration diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1- Heat sink, 2... Insulator layer, 3- Conductor nocturne, 11-... Input terminal, 12-... Output terminal, 14... Optical coupling element, JJ... Light emitting diode, 1g-... Triac, 11...Diode bridge full-wave rectifier circuit, 19-22...Diode, ZS-...Optical thyristor, 2#"ttp turtle 2 inzoster, j8゜29-condenser f, 51-51... Conductor number 4p-n, C1 to Cγ・
... Stray capacitance.

Claims (1)

[Claims] An AC solid state relay device in which a conductor pattern is formed on a conductive heat sink via an insulating layer, and individual elements are connected on this conductor pattern to form a circuit. and the secondary side of the optical coupling element. 1. A solid state relay device for AC, characterized in that a capacitor element for a noise pin bus is connected between a conductor pattern serving as an output end of a rectifier circuit and a conductor pattern of an AC line.