JP5606233B2 - Hybrid relay - Google Patents

Description

  The present invention relates to a hybrid relay including a mechanical contact switch and a semiconductor switch.

  2. Description of the Related Art Conventionally, a hybrid relay including a mechanical contact switch and a semiconductor switch connected in parallel has been used to switch between supply and cut-off of power to a load including an inverter circuit that performs inverter control such as a lighting fixture. . A load having an inverter circuit is provided with a large-capacity smoothing capacitor in order to convert an AC voltage into a DC voltage. When a power source is turned on from the AC power source to the load, a large current flows into the smoothing capacitor, so that an inrush current flows into the load. In particular, in a high load situation where the power supply voltage is high, the inrush current flowing into the load increases, so that a large current based on this inrush current also flows through the hybrid relay connected between the load and the AC power supply. It will be.

  For this reason, in such a hybrid relay, in order to avoid a contact welding of a contact pair of the mechanical contact switch due to a large current based on the inrush current flowing through the mechanical contact switch, the semiconductor switch is first brought into a conductive state. Is done.

In the following description, “semiconductor switch is turned on”, “mechanical contact switch is closed”, “semiconductor switch is turned on”, “mechanical contact” The switch is turned on. "
Similarly, in the following description, “semiconductor switch is turned off”, “mechanical contact switch is opened”, “semiconductor switch is turned off”, “machine switch The type contact switch is turned off. "

  After the inrush current flows to the semiconductor switch, the mechanical contact switch is turned on when the current supplied to the load is in a steady state. By such an operation, it is possible to suppress a large current from flowing through the mechanical contact switch in the hybrid relay, and it is possible to avoid contact welding due to the occurrence of an arc immediately before the contact of the contact pair of the mechanical contact switch. it can.

  As described above, the hybrid relay includes a semiconductor switch to prevent contact welding in the mechanical contact switch. After the semiconductor switch is turned on, the mechanical contact switch is turned on, and then the semiconductor switch is turned off. The power supply to the load is started.

  Also, before the mechanical contact switch is turned on, a hybrid having a configuration in which another mechanical contact switch different from the mechanical contact switch is connected in series with the semiconductor switch before the semiconductor switch is turned on. A relay has been proposed (see, for example, Patent Document 1). The circuit configuration of this hybrid relay will be described with reference to FIG. FIG. 5 is a schematic circuit diagram showing a circuit configuration of a conventional hybrid relay.

  The hybrid relay 1 forms a closed circuit with the AC power supply 2 and the load 3 by being connected to one end of each of the AC power supply 2 and the load 3 connected in series. The hybrid relay 1 has a terminal 10 connected to the other end of the AC power supply 2 having one end connected to one end of the load 3, a terminal 11 connected to the other end of the load 3, and both ends connected to the terminals 10 and 11. A first mechanical contact switch 12 having a contact portion S1, a second mechanical contact switch 13 having a contact portion S2 having one end connected to a connection node between the terminal 10 and one end of the contact portion S1, and a contact portion. The semiconductor switch 14 including the triac S3 having the T1 electrode connected to the other end of S2 and the T2 electrode connected to the terminal 11, and the first and second mechanical contact switches 12 and 13 and the semiconductor switch 14 are turned on. And a signal processing circuit 16 that performs (close) / OFF (open) control.

  Power supply from the AC power supply 2 to the load 3 via the hybrid relay 1 is performed based on an instruction from the signal processing circuit 16. Specifically, based on an instruction from the signal processing circuit 16, the second mechanical contact switch 13 and the semiconductor switch 14 are turned on. Further, based on an instruction from the signal processing circuit 16, the first machine connected in parallel to the second mechanical contact switch 13 and the semiconductor switch 14 connected in series after power is supplied from the AC power supply 2 to the load 3. The type contact switch 12 is turned ON. Thereafter, based on an instruction from the signal processing circuit 16, the semiconductor switch 14 and the second mechanical contact switch 13 are sequentially turned off. As described above, the power supply from the AC power source 2 to the load 3 is performed via the power supply path formed by the second mechanical contact switch 12 and the semiconductor switch 14 at the timing when the triac S3 of the semiconductor switch 14 is turned on. Is called. Further, the power supply from the AC power source 2 to the load 3 is performed through a power supply path including the first mechanical contact switch 12 after both the second mechanical contact switch 13 and the semiconductor switch 14 are turned off.

  Next, in the state where the first mechanical contact switch 12 is ON, the power supply from the AC power supply 2 to the load 3 via the hybrid relay 1 is cut off based on an instruction from the signal processing circuit 16. Specifically, based on an instruction from the signal processing circuit 16, the second mechanical contact switch 13 and the semiconductor switch 14 are turned on. As a result, a power supply path via the second mechanical contact switch 13 and the semiconductor switch 14 is established, and a part of the current flowing to the load 3 flows to the second mechanical contact switch 13 and the semiconductor switch 14, The current flowing through the mechanical contact switch 12 is reduced. Thereafter, based on an instruction from the signal processing circuit 16, the first mechanical contact switch 12 is turned off, and the semiconductor switch 14 and the second mechanical contact switch 13 are turned off in this order. The power supply from the AC power supply 2 to the load 3 is cut off in synchronization with the semiconductor switch 14 being turned off.

  The hybrid relay 1 disclosed in Patent Document 1 is a latching type mechanical contact switch installed on a power supply path to a load, and only when the mechanical contact switch is opened or closed, the other mechanical contact is provided. The switch and the semiconductor switch are operated. Thereby, the power consumption at the time of use of the hybrid relay 1 can be reduced.

JP 2010-103099 A

  However, in the hybrid relay 1 in Patent Document 1 described above, when power is supplied from the AC power supply 2 to the load 3, the contact portion S2 of the second mechanical contact switch 13 is turned on until the semiconductor switch 14 is turned on. Noise may occur in the meantime. Thus, when a noise component is included in the voltage between the contacts of the contact portion S2 of the second mechanical contact switch 13, the triac S3 constituting the semiconductor switch 14 malfunctions as shown in FIG. FIG. 6 is a timing chart for explaining an example of operation timing in a conventional hybrid relay.

  Therefore, when the second mechanical contact switch 13 is turned ON and a noise component is included in the voltage between the contact portions S2 of the second mechanical contact switch 13, the triac S3 is unexpectedly turned ON or OFF. The load 3 malfunctions in synchronization with In such a case, as a result, there is a problem that the operation reliability of the hybrid relay 1 is not stable.

  In view of such conventional problems, the present invention proposes a hybrid relay that effectively suppresses the malfunction of a semiconductor switch and a load when noise occurs between the contacts of the contact portion of the mechanical contact switch. The purpose is to do.

In order to achieve the above object, the hybrid relay of the present invention has a first mechanical contact switch whose contact is opened and closed by the first drive unit and a contact which is opened and closed by the second drive unit separate from the first drive unit. A second mechanical contact switch, and a semiconductor switch connected in series with the second mechanical contact switch, and a series circuit including the second mechanical contact switch and the semiconductor switch on a power supply path that supplies power from the power source to the load; A latching type mechanical type in which a first mechanical contact switch is connected in parallel, and current is supplied to the first drive unit when the first mechanical contact switch is opened and closed. Each of the second mechanical contact switch and the semiconductor switch is conductive before switching the opening / closing of the contact of the first mechanical contact switch, and the first mechanical contact switch Each After switching the opening and closing of the contacts of the switch has become nonconductive, the first mechanical contact switch, a snubber circuit connected in parallel, or if the supply is cut off electric power supplied from the power source to the load In this case, after the second mechanical contact switch is turned on, the semiconductor switch is turned on, and the snubber circuit is supplied with power from the power source to the load or from the power source to the load. In the case where the supply of electric power is cut off, noise generated between when the second mechanical contact switch is turned on and when the semiconductor switch is turned on is suppressed .

  In this hybrid relay, the snubber circuit may be formed by connecting in series a resistor that constitutes the semiconductor switch and a capacitor that is provided in parallel to the phototriac that constitutes the semiconductor switch. preferable.

  In this hybrid relay, the snubber circuit is preferably formed by connecting a resistor and a capacitor connected in parallel to the semiconductor switch in series.

  Moreover, in this hybrid relay, it is preferable that the resistance constituting the snubber circuit is a surge resistance.

  ADVANTAGE OF THE INVENTION According to this invention, when noise generate | occur | produces between the contacts of the contact part of a mechanical contact switch, generation | occurrence | production of a malfunction of a semiconductor switch and load can be suppressed effectively.

Schematic circuit diagram showing the circuit configuration of the hybrid relay of the first embodiment Timing chart for explaining an example of operation timing of the hybrid relay of the first embodiment when the load is turned on Timing chart for explaining an example of the operation timing of the hybrid relay of the first embodiment when the load is turned off The schematic circuit diagram which shows the circuit structure of the hybrid relay of the modification of 1st Embodiment Schematic circuit diagram showing the circuit configuration of a conventional hybrid relay Timing chart explaining an example of operation timing in a conventional hybrid relay

<First Embodiment>
A hybrid relay according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic circuit diagram illustrating a circuit configuration of the hybrid relay 1 according to the first embodiment.

In the following description, “semiconductor switch is turned on”, “mechanical contact switch is closed”, “semiconductor switch is turned on”, “mechanical contact” The switch is turned on. "
Similarly, “semiconductor switch is turned off”, “mechanical contact switch is opened”, “semiconductor switch is turned off”, and “mechanical contact switch is turned off”, respectively. Will be described.

1. Configuration of Hybrid Relay 1 As shown in FIG. 1, the hybrid relay 1 of the first embodiment is connected to one end of each of an AC power supply 2 and a load 3 connected in series, whereby an AC power supply 2 and a load 3 are connected. And form a closed circuit. That is, power supply from the AC power source 2 to the load 3 and power supply interruption are performed by the hybrid relay 1 being in the ON state and the OFF state. The AC power source 2 is, for example, a commercial power source of 100 [V]. The load 3 is, for example, a lighting device including a fluorescent lamp or an incandescent bulb or a ventilation fan.

  The hybrid relay 1 has a terminal 10 connected to the other end of the AC power supply 2 having one end connected to one end of the load 3, a terminal 11 connected to the other end of the load 3, and one end connected to the terminal 10. A first mechanical contact switch 12 including a contact portion S1, a second mechanical contact switch 13 including a contact portion S2 having one end connected to a connection node between the terminal 10 and one end of the contact portion S1, and a contact portion S2. The semiconductor switch 14 including the triac S3 having the T1 electrode connected to the other end and the T2 electrode connected to the terminal 11, and the first and second mechanical contact switches 12 and 13 and the semiconductor switch 14 are turned on or off, respectively. And a signal processing circuit 16 that performs control for setting the state.

  The circuit configuration of the hybrid relay 1 will be described in detail. In the hybrid relay 1, a series circuit constituted by the contact portion S 2 of the second mechanical contact switch 13 and the triac S 3 of the semiconductor switch 14 and the first mechanical contact switch 12 are connected in parallel between the terminals 10 and 11. Has been.

  The first mechanical contact switch 12 is a latching type mechanical contact switch, and a magnetic coil L1 that generates an electromagnetic force for switching the contact portion S1 to the ON state and an electromagnetic for switching the contact portion S1 to the OFF state. And a magnetic coil L2 for generating a force. That is, the magnetic coils L 1 and L 2 constitute the first drive unit of the first mechanical contact switch 12.

  The second mechanical contact switch 13 is a normally-excited mechanical contact switch, and includes a magnetic coil L3 that generates an electromagnetic force for holding the contact portion S2 in an ON state. That is, the magnetic coil L3 constitutes the second drive unit of the second mechanical contact switch 13.

  In the first mechanical contact switch 12, one end of the magnetic coil L1 is connected to the cathode electrode of the diode D3 whose anode electrode is connected to the signal processing circuit 16, while one end of the magnetic coil L2 is connected to the anode electrode as a signal. It is connected to the cathode electrode of the diode D4 connected to the processing circuit 16. The other ends of these magnetic coils L1, L2 are connected to each other. Further, the connection nodes of the magnetic coils L1 and L2 are grounded and connected to the anode electrodes of the diodes D1 and D2. In the following description, “ground” means connecting to a reference voltage in the hybrid relay 1.

  The cathode electrodes of the diodes D1 and D2 are connected to the cathode electrodes of the diodes D3 and D4. As described above, the first mechanical contact switch 12 includes the magnetic coils L1 and L2 connected in series, the diodes D1 and D2 whose anode electrodes are connected to each other, and the diode D3 whose anode electrode is connected to the signal processing circuit 16. , D4.

  The second mechanical contact switch 13 includes one magnetic coil L3 and a diode D5 connected in parallel with the magnetic coil L3. A connection node formed by one end of the magnetic coil L3 and the anode electrode of the diode D5 is grounded, and a connection node formed by the other end of the magnetic coil L3 and the cathode electrode of the diode D5 is connected to the signal processing circuit 16.

  The semiconductor switch 14 includes a triac S3, a capacitor C1, a resistor R1, and a capacitor C2 connected in parallel between the T2 electrode and the gate electrode of the triac S3, a resistor R2 having one end connected to the T1 electrode of the triac S3, The phototriac coupler 15 includes a phototriac S4 having a T1 electrode connected to the other end of the resistor R2.

  Note that when the contact portion S2 of the second mechanical contact switch 13 is turned on, a large current based on the inrush current flows through the semiconductor switch 14, so the resistor R2 is preferably a surge resistant resistor.

  Further, the capacitor C2 is connected in parallel with the phototriac S4 and in series with the resistor R2. A snubber circuit is formed in the semiconductor switch 14 by connecting the resistor R2 and the capacitor C2 in series. As shown in FIG. 1, the snubber circuit is provided so as to be connected in parallel to the first mechanical contact switch 12.

  The phototriac coupler 15 further includes a light emitting diode LD having an anode electrode connected to the signal processing circuit 16 via a resistor R3 and a cathode electrode grounded. In the phototriac coupler 15, the optical signal from the light emitting diode LD is input to the phototriac S4 in which the T2 electrode is connected to the gate electrode of the triac S3. Further, the phototriac S4 is a semiconductor switching element having a zero cross point function. When an optical signal from the light emitting diode LD is incident, the phototriac S4 receives an AC voltage from the AC power supply 2 on the T2 electrode side of the phototriac S4. Only when the center voltage (reference voltage) is detected is conduction made.

2. Power Supply by Hybrid Relay 1 The operation of the hybrid relay 1 when power is supplied when the AC power source 2 to the load 3 is turned on will be described with reference to the timing chart of FIG. FIG. 2 is a timing chart showing an example of the operation timing of the hybrid relay 1 when the load 3 is turned on via the hybrid relay 1 of the first embodiment, that is, when the load 3 is operated by supplying power. It is a chart.

  Hereinafter, the operation of each unit in the hybrid relay 1 when the signal processing circuit 16 is instructed to supply power from the AC power supply 2 to the load 3 will be described. As shown in FIG. 2, the signal processing circuit 16 outputs a signal for supplying a driving current to the magnetic coil L3 at time t0. Based on the drive current supplied in response to this signal, an electromagnetic attractive force is generated in the magnetic coil L3, and the contact portion S2 of the second mechanical contact switch 13 including the magnetic coil L3 is turned on at time t1. . The diode D5 connected in parallel with the magnetic coil L3 functions as a backflow prevention diode for preventing the current flowing through the magnetic coil L3 from flowing back. Since the contact portion S2 of the second mechanical contact switch 13 is turned on at time t1, the voltage between the contacts of the contact portion S2 drops as shown in FIG.

  Furthermore, as shown in FIG. 1, a snubber circuit is formed in the semiconductor switch 14 by the resistor R2 constituting the semiconductor switch 14 and the capacitor C2 provided in parallel with the phototriac S4. Yes. This snubber circuit generates noise generated when the contact portion S2 of the second mechanical contact switch 13 is turned on at time t1 when power is supplied from the AC power supply 2 to the load 3 (see FIG. 6). Generation | occurrence | production can be suppressed and generation | occurrence | production of malfunctioning of triac S3 can be suppressed as a result. That is, the snubber circuit enables the hybrid relay 1 of the first embodiment to supply power from the AC power source 2 to the load 3 at an appropriate timing without causing the triac S3 to malfunction.

  After the contact portion S2 of the second mechanical contact switch 13 is turned on at time t1, the signal processing circuit 16 supplies a drive current to the light emitting diode LD at time t2. Thereby, in the phototriac coupler 15, the light emitting diode LD emits light, and the phototriac S4 receives the optical signal generated by the light emission. The photo triac S4 has a zero cross point arc function, and as shown in FIG. 2, when it is detected that the AC voltage from the AC power source 2 becomes the center voltage which is the reference voltage (time t3), the photo triac S4 Turns on.

  Due to the ON state of the phototriac S4, an AC current from the AC power supply 2 flows through the resistor R2 and the phototriac S4 to the parallel circuit including the resistor R1 and the capacitor C1. As a result, a parallel circuit including the resistor R1 and the capacitor C1 operates, a current is supplied to the gate electrode of the triac S3, a voltage is generated between the T1 electrode and the T2 electrode of the triac S3, and the electrode is in an ON state, that is, the triac S3 Is turned on (time t3). As a result, the load 3 is electrically connected to the AC power supply 2 via the second mechanical contact switch 13 and the semiconductor switch 14 of the hybrid relay 1, so that the power from the AC power supply 2 is supplied to the load 3. The

  At this time, since an inrush current flows from the AC power supply 2 to the load 3, a large current based on the inrush current flows also in each of the triac S3 and the phototriac S4 that are turned on. This inrush current has a variation in the amount of current because the phototriac S4 has a zero cross point call function, so that the timing at which the phototriac S4 is turned on does not vary with respect to the cycle of the AC voltage from the AC power supply 2. Can be suppressed.

After the triac S3 is turned on at time t3, the signal processing circuit 16 applies a pulse current as a driving current to the magnetic coil L1 through the diode D3 at time t4. At this time, in the first mechanical contact switch 12, the diode D1 functions as a backflow prevention diode that prevents the current flowing to the magnetic coil L1 from flowing back, and the diode D4 prevents the current from flowing to the magnetic coil L2.
As a result, a pulse current flows through the magnetic coil L1, and an electromagnetic attractive force temporarily acts, so that the contact portion S1 of the first mechanical contact switch 12 is turned on (time t5). Since the first mechanical contact switch 12 is a latching type, the contact portion S1 is held in the ON state even after the current supply to the magnetic coil L1 is stopped.

  Furthermore, when the contact portion S1 of the first mechanical contact switch 12 is turned on at time t5, the current from the AC power supply 2 flows to the contact portion S1, and the current does not flow to the triac S3. Therefore, at a time t5, between the T1 electrode and the T2 electrode of the triac S3 is in an OFF state, that is, the triac S3 is in an OFF state so as to be substantially synchronized with the ON state of the contact portion S1 of the first mechanical contact switch 12. Even after time t5, since the contact portion S1 of the first mechanical contact switch 12 is in the ON state, power from the AC power supply 2 to the load 3 is continuously supplied.

  After the triac S3 is turned off at time t5, the signal processing circuit 16 stops supplying drive current to the magnetic coil L3 of the second mechanical contact switch 13 at time t6. That is, since the current supply to the magnetic coil L3 is stopped, the normally-excited second mechanical contact switch 13 loses the electromagnetic attraction by the magnetic coil L3, and the contact portion of the second mechanical contact switch 13 S2 is turned off.

  As a result, since the second mechanical contact switch 13 is turned off after the triac S3 is turned off, a current flows on the power supply path constituted by the second mechanical contact switch 13 and the semiconductor switch 14. In the absence, the contact of the contact portion S2 is turned off. Therefore, when the second mechanical contact switch 13 is turned off, arcing between the contacts of the contact portion S2 can be prevented, so that contact welding at the second mechanical contact switch 13 can be prevented. .

3. Next, the operation of the hybrid relay 1 when the power supply is cut off by cutting off the power from the AC power source 2 to the load 3 in the hybrid relay 1 will be described with reference to the timing chart of FIG. FIG. 3 is a timing chart showing an example of operation timing of the hybrid relay 1 when the load 3 is turned off via the hybrid relay 1 of the first embodiment, that is, when power supply to the load 3 is cut off. It is.

  In FIG. 3, immediately before time t <b> 7, power is supplied to the load 3 from the AC power supply 2, the contact portion S <b> 1 of the first mechanical contact switch 12 is in the ON state, and the contact of the second mechanical contact switch 13. Assume that the part S2 is in the OFF state and the semiconductor switch 14 including the triac S3 is in the OFF state.

  Hereinafter, the operation of each unit in the hybrid relay 1 when the signal processing circuit 16 is instructed to cut off the power supply from the AC power supply 2 to the load 3 will be described. As shown in FIG. 3, the signal processing circuit 16 outputs a signal for supplying a drive current to the magnetic coil L3 at time t7 when power is supplied from the AC power supply 2 to the load 3. . Based on the drive current supplied in response to this signal, an electromagnetic attractive force is generated in the magnetic coil L3, and the contact portion S2 of the second mechanical contact switch 13 including the magnetic coil L3 is turned on at time t8. . Since the contact portion S2 of the second mechanical contact switch 13 is turned on at time t8, the voltage between the contacts of the contact portion S2 drops as shown in FIG.

  Further, as described above, a snubber circuit is formed in the semiconductor switch 14 by the resistor R2 constituting the semiconductor switch 14 and the capacitor C2 provided in parallel with the phototriac S4. This snubber circuit generates noise when the contact portion S2 of the second mechanical contact switch 13 is turned on at time t8 when the power supply from the AC power supply 2 to the load 3 is cut off (see FIG. 6). Can be suppressed, and as a result, the malfunction of the triac S3 can be suppressed. That is, the snubber circuit enables the hybrid relay 1 of the first embodiment to cut off the power supply from the AC power source 2 to the load 3 at an appropriate timing without causing the malfunction of the triac S3.

  After the contact portion S2 of the second mechanical contact switch 13 is turned on at time t8, the signal processing circuit 16 applies a pulse current as a drive current to the magnetic coil L2 through the diode D4 at time t9. . At this time, in the first mechanical contact switch 12, the diode D2 functions as a backflow prevention diode that prevents the current flowing to the magnetic coil L2 from flowing back, and the diode D3 prevents the current from flowing to the magnetic coil L1. As a result, a pulse current flows through the magnetic coil L2, and an electromagnetic attractive force temporarily works, so that the contact portion S1 of the first mechanical contact switch 12 is turned off (time t10).

  Further, when the contact portion S1 of the first mechanical contact switch 12 is turned off at time t10, the current from the AC power source 2 flows to the contact portion S2 of the second mechanical contact switch 13, and the semiconductor switch 14 including the triac S3. The current flows in the current. Furthermore, a minute voltage is applied between the T1 electrode and the T2 electrode of the phototriac S4 before time t9. Therefore, between the T1 electrode and the T2 electrode of the triac S3 is turned ON at time t10 so as to be substantially synchronized with the OFF of the contact portion S1 of the first mechanical contact switch 12.

  The contact portion S1 of the first mechanical contact switch 12 is turned off at time t10. However, since both the contact portion S2 of the second mechanical contact switch 13 and the semiconductor switch 14 are in the ON state, the load is loaded at the time t10. 3 is continuously supplied with power from the AC power source 2.

  After time t10, the signal processing circuit 16 stops supplying the drive current to the light emitting diode LD at time t11. As a result, the light signal from the light emitting diode LD is no longer applied to the phototriac S4, so that the phototriac S4 is turned off when the AC voltage from the AC power supply 2 becomes the center voltage (time t12). In conjunction with the OFF state of the phototriac S4, the triac S3 is turned off, so that the semiconductor switch 14 is turned off as a whole. Therefore, since the power supply path from the AC power supply 2 to the load 3 is interrupted, the power supply to the load 3 by the AC power supply 2 is stopped.

  Further, the signal processing circuit 16 stops the supply of the drive current to the light emitting diode LD, and then stops the supply of the drive current to the magnetic coil L3 at time t13. That is, after the semiconductor switch 14 is turned off as a whole, excitation by the magnetic coil L3 is stopped and the contact of the contact portion S2 of the second mechanical contact switch 13 is turned off. At this time, since the semiconductor switch 14 is already turned off overall and no current flows through the second mechanical contact switch 13, no arc is generated even when the contact of the contact portion S2 is turned off. The contact wear of the second mechanical contact switch 13 can be prevented.

Thus, in the hybrid relay 1 of the first embodiment, the snubber circuit including the series circuit of the resistor R2 constituting the semiconductor switch 14 and the capacitor C2 provided so as to be connected in parallel with the phototriac S4 is the first. The mechanical contact switch 12 is connected in parallel.
Thereby, in the hybrid relay 1 of the first embodiment, by newly providing only the capacitor C2, it is possible to effectively respond to the ON state of the second mechanical contact switch 13 without increasing the number of parts more than necessary. Thus, even when a noise component is included between the contacts of the second mechanical contact switch 13, the malfunction of the semiconductor switch 14 and the load 3 can be effectively suppressed.

<Variation 1 of the first embodiment>
As shown in FIG. 1, the snubber circuit in the hybrid relay 1 of the first embodiment is a series circuit of a resistor R2 constituting the semiconductor switch 14 and a capacitor C2 provided in parallel with the phototriac S4. Is formed. In order to reduce the number of parts in the hybrid relay 1, the circuit configuration of the hybrid relay 1 of the first embodiment is desirable.
However, in the hybrid relay of the present invention, the snubber circuit described above is not limited to an example in which the resistor R2 and the capacitor C2 are formed. In the first modification of the first embodiment, another example of forming the snubber circuit will be described with reference to FIG.

  FIG. 4 is a schematic circuit diagram illustrating a circuit configuration of the hybrid relay 1a according to the first modification of the first embodiment. In the hybrid relay 1a shown in FIG. 4, the same reference numerals are given to the same parts as the circuit configuration of the hybrid relay 1 shown in FIG. Since the operation | movement of each part to which the same referential mark is attached | subjected is the same as the operation | movement of each part of the hybrid relay 1 of 1st Embodiment, description of the said operation | movement is abbreviate | omitted.

  In the hybrid relay 1a of the first modification of the first embodiment, a snubber circuit is formed in which a resistor R4 and a capacitor C4, which are provided in parallel with the semiconductor switch 14a, are connected in series. That is, the hybrid relay 1a of the first modification of the first embodiment has a larger number of parts, such as the resistor R4 and the capacitor C4, than the hybrid relay 1 of the first embodiment. Even when a noise component is included between the contacts of the second mechanical contact switch 13 according to the ON state of the switch 13, it is possible to effectively suppress the malfunction of the semiconductor switch 14a and the load 3.

  Specifically, in the snubber circuit formed by the resistor R4 and the capacitor C4, when power is supplied from the AC power source 2 to the load 3, the contact portion S2 of the second mechanical contact switch 13 is in the ON state at time t1. It is possible to suppress the generation of noise (see FIG. 6) that occurs when the error occurs, and consequently to prevent the malfunction of the triac S3. Similarly, the snubber circuit generates noise when the contact portion S2 of the second mechanical contact switch 13 is turned on at time t8 when the power supply from the AC power supply 2 to the load 3 is cut off (see FIG. 6) can be suppressed, and as a result, the malfunction of the triac S3 can be suppressed.

  While various embodiments have been described with reference to the accompanying drawings, it goes without saying that the hybrid relays 1 and 1a of the present invention are not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, the first mechanical contact switch 12 of the above-described embodiment has been described as being a latching type switch, but may be a constantly excited type switch. In this case, a predetermined current needs to be continuously supplied from the signal processing circuit 16 to the magnetic coil of the first mechanical contact switch 12 while the power is supplied to the load 3. Although the total amount of drive current in the relay 1 increases, the structure of the hybrid relay 1 can be downsized as a whole.

DESCRIPTION OF SYMBOLS 1,1a Hybrid relay 2 AC power supply 3 Load 10,11 Terminal 12 1st mechanical contact switch 13 2nd mechanical contact switch 14,14a Semiconductor switch 15 Phototriac coupler 16 Signal processing circuit C1, C2, C4 Capacitors D1-D5 Diodes L1 to L3 Magnetic coil LD Light emitting diodes R1 to R4 Resistors S1 and S2 Contact part S3 Triac S4 Phototriac

Claims (6)

A first mechanical contact switch whose contact is opened and closed by a first drive unit;
A second mechanical contact switch whose contact is opened and closed by a second drive unit separate from the first drive unit;
A semiconductor switch connected in series with the second mechanical contact switch,
On the power supply path for supplying the load from the power source, the series circuit of the second mechanical contact switch and the semiconductor switch and the first mechanical contact switch are connected in parallel.
The second mechanical contact switch and the semiconductor switch are each conducted before the contact of the first mechanical contact switch is closed,
A snubber circuit is connected in parallel to the first mechanical contact switch ,
When the power from the power source is supplied to the load or when the supply is cut off, the semiconductor switch is turned on after the second mechanical contact switch is turned on,
When the power from the power source is supplied to the load or when the power supply from the power source is interrupted to the load, the snubber circuit is turned on after the second mechanical contact switch is turned on. A hybrid relay characterized by suppressing noise generated until the switch is turned on . The hybrid relay according to claim 1,
The snubber circuit is formed by connecting in series a resistor that constitutes the semiconductor switch and a capacitor that is provided in parallel to the phototriac that constitutes the semiconductor switch. relay. The hybrid relay according to claim 1,
The snubber circuit is formed by connecting a resistor and a capacitor connected in parallel to the semiconductor switch in series. The hybrid relay according to claim 2,
The hybrid relay characterized in that the resistance constituting the snubber circuit is a surge resistance. The hybrid relay according to any one of claims 1 to 4,
Each of the second mechanical contact switch and the semiconductor switch is turned on before switching the opening and closing of the contact of the first mechanical contact switch, and each of the second mechanical contact switch and the semiconductor switch after switching the contact of the first mechanical contact switch. A hybrid relay that is non-conductive. The hybrid relay according to any one of claims 1 to 5,
The hybrid is characterized in that the first mechanical contact switch is a latching type mechanical contact switch in which a current is supplied to the first drive unit when the contact of the first mechanical contact switch is opened and closed. relay.

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