TWI527077B - Hybrid relay - Google Patents

Description

Hybrid relay

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

Conventionally, in order to switch the supply and disconnection of power to a load of an inverter circuit that is controlled by an inverter such as a lighting fixture, mechanical contacts including parallel connections have been used. Hybrid relay for switches and semiconductor switches. A load having an inverter circuit is provided with a large-capacity smoothing capacitor in order to convert an alternating voltage into a direct voltage. When the power is applied to the load from an alternating power supply, a large current flows into the smoothing capacitor, so an impulse current flows into the load. In particular, in the case of a high load with a high power supply voltage, since the inrush current flowing into the load becomes large, a large current based on the inrush current flows into the hybrid relay connected between the load and the alternating current power source.

Therefore, in such a hybrid relay, in order to prevent a large current flowing to the mechanical contact switch based on the inrush current, the contact contact of the mechanical contact switch is contact-welded, first, the semiconductor switch is made On state.

In the following description, "turning the semiconductor switch to the on state" and "turning the mechanical contact switch to the closed state" are respectively referred to as "turning the semiconductor switch ON" and "turning the mechanical contact switch ON".

Similarly, in the following description, "turning the semiconductor switch to the non-conducting state" and "turning the mechanical contact switch to the off state" are respectively referred to as "turning off the semiconductor switch" and "turning off the mechanical contact switch". .

When the inrush current flows into the semiconductor switch and the current supplied to the load becomes stable, the mechanical contact switch is turned ON. By this action, it is possible to suppress a large current flowing in the mechanical contact switch in the hybrid relay, thereby avoiding: due to the arc (arc) before the contact pair of the mechanical contact switch is about to contact And cause the joint to weld.

In this manner, the hybrid relay includes a semiconductor switch to prevent contact welding of the mechanical contact switch, and turns on the mechanical contact switch after turning on the semiconductor switch, and then turns off the semiconductor switch, and then starts supplying power to the load.

Further, a hybrid relay is proposed in which another mechanical contact switch different from the mechanical contact switch is connected in series with the semiconductor switch before the mechanical contact switch and the semiconductor switch are turned ON. (For example, refer to Patent Document 1). The circuit configuration of the hybrid relay will be described with reference to Fig. 5 . FIG. 5 is a schematic circuit diagram showing a circuit configuration of a conventional hybrid relay.

The hybrid relay 1 is connected to the AC power source 2 and the load 3 connected in series to form a closed-circuit with the AC power source 2 and the load 3. The hybrid relay 1 includes a terminal 10 connected to the other end of the AC power source 2 whose one end is connected to the load 3, a terminal 11 connected to the other end of the load 3, and a first mechanical contact switch 12 including The two ends are connected to the contact portion S1 of the terminals 10 and 11; the second mechanical contact switch 13 includes a contact portion S2, one end of which is connected to a connection node between the terminal 10 and one end of the contact portion S1; and the semiconductor switch 14, The utility model comprises a triac S3, wherein the T1 electrode is connected to the other end of the contact portion S2 and the T2 electrode is connected to the terminal 11; and the signal processing circuit 16 performs the first and second mechanical contacts. The switches 12, 13 and the semiconductor switch 14 are each controlled by ON/OFF.

The supply of electric power from the AC power source 2 to the load 3 via the hybrid relay 1 is performed in accordance with an instruction from the signal processing circuit 16. Specifically, the second mechanical contact switch 13 and the semiconductor switch 14 are turned ON in response to an instruction from the signal processing circuit 16. Further, after the electric power is supplied from the AC power supply 2 to the load 3, the first mechanical connection is connected in parallel to the second mechanical contact switch 13 and the semiconductor switch 14 connected in series, in response to an instruction from the signal processing circuit 16. The point switch 12 is ON. Thereafter, the semiconductor switch 14 and the second mechanical contact switch 13 are sequentially turned OFF in accordance with an instruction from the signal processing circuit 16. As described above, the start of the supply of electric power from the AC power source 2 to the load 3 is the timing at which the triac of the semiconductor switch 14 is turned ON, and the second mechanical contact switch 13 and the semiconductor switch are passed. 14 is formed by a feeder circuit. In addition, the power supply from the AC power supply 2 to the load 3 is performed after the second mechanical contact switch 13 and the semiconductor switch 14 are turned off, and then passed through the feed circuit including the first mechanical contact switch 12.

Next, in a state where the first mechanical contact switch 12 is ON, the supply of electric power from the AC power supply 2 to the load 3 via the hybrid relay 1 is performed in accordance with an instruction from the signal processing circuit 16. Specifically, the second mechanical contact switch 13 and the semiconductor switch 14 are turned ON in response to an instruction from the signal processing circuit 16. Thereby, the feed circuit that passes through 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, thereby reducing the flow to the first mechanical connection. Point the current of switch 12. Thereafter, in response to 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 sequentially turned OFF. Further, the disconnection of the power supply from the AC power source 2 to the load 3 is performed in synchronization with the OFF of the semiconductor switch 14.

In the hybrid relay 1 disclosed in Patent Document 1, the first mechanical contact switch 12 provided on the load-feeding circuit is set to a latching type, and only the first mechanical contact is opened and closed. When the switch 12 is turned on, the second mechanical contact switch 13 and the semiconductor switch 14 are operated. Thereby, the power consumption when the hybrid relay 1 is used can be reduced.

Patent Document 1: Japanese Patent Laid-Open Publication No. 2010-103099

However, in the hybrid relay 1 of the above-described Patent Document 1, when the electric 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 to turn the semiconductor switch 14 ON. There is a possibility of noise during the period until. As described above, when the voltage between the contacts of the contact portion S2 of the second mechanical contact switch 13 includes a noise component, the three-terminal bidirectional controllable switch S3 constituting the semiconductor switch 14 malfunctions as shown in FIG. . FIG. 6 is a timing chart showing an example of an operation sequence of a conventional hybrid relay.

Therefore, when the second mechanical contact switch 13 is turned on and the voltage between the contacts of the contact portion S2 of the second mechanical contact switch 13 contains a noise component, the load 3 will be The unintended ON or OFF of the triac sigma switch S3 malfunctions synchronously. In such a case, the result is that the operational reliability of the hybrid relay 1 is unstable.

In view of such a conventional problem, the present invention provides a hybrid relay that effectively suppresses occurrence of malfunction of a semiconductor switch and a load when noise is generated between contacts of a contact portion of a mechanical contact switch.

According to an embodiment of the present invention, a hybrid relay includes: a first mechanical contact switch that opens and closes a contact by a first driving portion; and a second mechanical contact switch that is coupled to the first a second drive unit having a different drive unit opens and closes the contact; and a semiconductor switch connected in series with the second mechanical contact switch; and a second mechanical contact switch on the feed circuit that supplies power from the power source to the load The series circuit formed by the semiconductor switch is connected in parallel with the first mechanical contact switch, and the first mechanical contact switch supplies current to the first drive unit when the contact of the first mechanical contact switch is opened and closed. The latch type mechanical contact switch, the second mechanical contact switch and the semiconductor switch are respectively turned on before switching the contact of the first mechanical contact switch, and the contact of the first mechanical contact switch is switched. After the opening and closing, it becomes non-conductive, and a snubber circuit is connected in parallel with respect to the first mechanical contact switch.

Preferably, the snubber circuit is formed by connecting resistors constituting the semiconductor switch and capacitors connected in parallel to the photo triac constituting the semiconductor switch in parallel.

Preferably, the buffer circuit is formed by a series circuit of a resistor and a capacitor connected in parallel with respect to the semiconductor switch.

The resistance constituting the above snubber circuit is preferably an anti-surge resistance.

[Effects of the Invention]

According to the embodiment of the present invention, when noise is generated between the contacts of the contact portion of the mechanical contact switch, the occurrence of malfunction of the semiconductor switch and the load can be effectively suppressed.

The objects and features of the present invention will become apparent from the following description and appended claims.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings which form a part of this specification. The same or similar components are denoted by the same reference numerals throughout the drawings, and the description is omitted.

<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 showing a circuit configuration of a hybrid relay 1 according to the first embodiment.

1. The composition of the hybrid relay 1

As shown in FIG. 1, the hybrid relay 1 of the first embodiment is connected to the AC power supply 2 and the load 3 connected in series to form a closed circuit with the AC power supply 2 and the load 3. In other words, the supply of electric power from the AC power source 2 to the load 3 and the disconnection of the power supply are performed by the hybrid relay 1 being in an ON state and an OFF state. The AC power source 2 is, for example, a commercial power source of 100 V or the like. The load 3 is set to include a lighting fixture such as a fluorescent lamp or an incandescent lamp, a ventilating fan, and the like.

The hybrid relay 1 includes a terminal 10 connected to the other end of the AC power source 2 whose one end is connected to the load 3, a terminal 11 connected to the other end of the load 3, and a first mechanical contact switch 12 including One end is connected to the contact portion S1 of the terminal 10; the second mechanical contact switch 13 includes a contact portion S2, one end of which is connected to the connection node of the terminal 10 and one end of the contact portion S1; and the semiconductor switch 14 includes a three-terminal bidirectional controllable switch S3 having a T1 electrode connected to the other end of the contact portion S2 and a T2 electrode connected to the terminal 11; and a signal processing circuit 16 for performing the first and second mechanical contact switches 12, Each of the semiconductor switch 14 and the semiconductor switch 14 is in an ON state or an OFF state.

The circuit configuration of the hybrid relay 1 will be described in detail. In the hybrid relay 1, the series circuit composed of the contact portion S2 of the second mechanical contact switch 13 and the three-terminal bidirectional control switch S3 of the semiconductor switch 14 is connected to the first mechanical contact switch 12 at the terminal 10 11 connected in parallel.

The first mechanical contact switch 12 is a latch type mechanical contact switch, and includes an electromagnetic coil L1 that generates an electromagnetic force for switching the contact portion S1 to an ON state, and is generated for The contact portion S1 is switched to the electromagnetic coil L2 of the electromagnetic force in the OFF state. In other words, the electromagnetic coils L1 and L2 constitute the first drive unit of the first mechanical contact switch 12.

The second mechanical contact switch 13 is a mechanical-type contact switch of a rated-load field type, and includes an electromagnetic coil L3 that generates an electromagnetic force for holding the contact portion S2 in an ON state. In other words, the electromagnetic 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 electromagnetic coil L1 is connected to the cathode electrode of the diode D3, and the anode electrode of the diode D3 is connected to the signal processing circuit 16; on the other hand, the electromagnetic coil One end of L2 is connected to the cathode electrode of the diode D4, and the anode electrode of the diode D4 is connected to the signal processing circuit 16. The other ends of the electromagnetic coils L1, L2 are connected to each other. Further, the connection nodes of the electromagnetic coils L1, L2 are grounded and connected to the anode electrodes of the respective diodes D1, D2. In addition, "grounding" in the following description means the reference voltage connected to the inside of the hybrid relay 1.

Further, the cathode electrodes of the diodes D1 and D2 are connected to the cathode electrodes of the respective diodes D3 and D4. Therefore, the first mechanical contact switch 12 is composed of electromagnetic coils L1 and L2 connected in series, diodes D1 and D2 connected to the anode electrode, and diodes D3 and D4 whose anode electrodes are connected to the signal processing circuit 16. .

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

The semiconductor switch 14 is connected by a three-terminal bidirectional controllable switch S3, a capacitor C1 connected between the T2 electrode and the gate electrode G of the three-terminal bidirectional controllable switch S3, and a capacitor C1 and a capacitor C2. The resistor R2 of the T1 electrode of the switch S3 is controlled, and a photo triac coupler 15 including a light bidirectional thyristor S4 whose T1 electrode is connected to the other end of the resistor R2.

When the contact portion S2 of the second mechanical contact switch 13 is turned on, a large current based on the inrush current also flows to the semiconductor switch 14. Therefore, the resistor R2 is preferably a surge resistance.

Further, the capacitor C2 is connected in parallel with respect to the series circuit of the optical bidirectional thyristor S4 and the resistor R1, and is connected in series with the resistor R2. A snubber circuit is formed in the semiconductor switch 14 by a resistor R2 connected in series with the capacitor C2. As shown in FIG. 1, the snubber circuit is provided in parallel with respect to the first mechanical contact switch 12.

The optical bidirectional thyristor coupler 15 further includes a light emitting diode LD (Laser Diode) whose anode electrode is connected to the signal processing circuit 16 via the resistor R3 and the cathode electrode is grounded. Further, in the optical two-way thyristor coupler 15, the optical signal from the light-emitting diode LD is incident on the optical two-way thyristor S4, and the T2 electrode is connected to the gate electrode G of the three-terminal thyristor switch S3. In addition, the optical bidirectional thyristor S4 is a semiconductor switching element having a zero cross point of arc function, and when the optical signal from the illuminating diode LD is incident, the T2 electrode of the optical bidirectional thyristor S4 The side starts to be turned on after detecting the center voltage (reference voltage) of the AC voltage of the AC power source 2.

2. Power supply of hybrid relay 1

The operation when power is supplied when the hybrid relay 1 is supplied with power or the like from the AC power supply 2 to the load 3 will be described with reference to the timing chart of FIG. 2 . FIG. 2 is a timing chart showing an example of an operation sequence of the hybrid relay 1 when the load 3 is turned on, that is, when the load 3 is turned on, and the power is supplied to the load 3 via the hybrid relay 1 of the first embodiment.

Hereinafter, the operation of each part in the hybrid relay 1 when the electric power is supplied from the AC power supply 2 to the load 3 is instructed by the signal processing circuit 16 will be described. As shown in FIG. 2, the signal processing circuit 16 outputs a signal for supplying a drive current to the electromagnetic coil L3 at time t0. The electromagnetic attraction force is generated in the electromagnetic coil L3 based on the drive current supplied in accordance with the signal, and the contact portion S2 of the second mechanical contact switch 13 including the electromagnetic coil L3 is turned ON at time t1. Further, the diode D5 connected in parallel to the electromagnetic coil L3 functions as a backflow prevention diode for preventing the current flowing through the electromagnetic 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 is lowered as shown in Fig. 2 .

Further, as shown in FIG. 1, in the semiconductor switch 14, a resistor R2 constituting the semiconductor switch 14 and a capacitor C2 provided in parallel with a series circuit of the optical bidirectional thyristor S4 and the resistor R1 are formed. Buffer circuit. When the power is supplied from the AC power supply 2 to the load 3, the snubber circuit can suppress the occurrence of noise when the contact portion S2 of the second mechanical contact switch 13 is turned on at time t1. As a result, the three ends can be suppressed. The malfunction of the two-way controllable switch S3 (refer to FIG. 6) is generated. In other words, with the snubber circuit, the hybrid relay 1 of the first embodiment can supply electric power from the AC power source 2 to the load 3 at a preferable timing without causing malfunction of the triac S3.

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 optical bidirectional thyristor coupler 15, the illuminating diode LD emits light, and the optical bidirectional thyristor S4 receives the illuminating optical signal. The optical bidirectional thyristor S4 has a zero crosspoint arc function. As shown in FIG. 2, when it is detected that the AC voltage from the AC power source 2 becomes the center voltage as the reference voltage (time t3), the optical bidirectional thyristor S4 becomes ON. status.

By the ON state of the optical bidirectional thyristor S4, the AC current from the AC power source 2 flows to the parallel circuit of the resistor R1 and the capacitor C1 via the resistor R2 and the optical bidirectional thyristor S4. Thereby, the parallel circuit of the resistor R1 and the capacitor C1 operates to supply a current to the gate electrode G of the triac S3, and a current flows to the T1 electrode-T2 electrode of the triac S3. The electrodes are turned ON, that is, the triac S3 is turned to the ON state (timing t3). Thereby, since the load 3 is electrically connected to the AC power source 2 via the second mechanical contact switch 13 and the semiconductor switch 14 of the hybrid relay 1, the power of the AC power source 2 is supplied to the load 3.

At this time, since the inrush current flows from the AC power source 2 to the load 3, the three-terminal bidirectionally controllable S switch S3 and the optical bidirectional gate fluid S4 in the ON state also flow into a large current based on the inrush current. Since the optical two-way thyristor S4 has a zero-crossing point arc function, the timing at which the optical two-way thyristor S4 is in the ON state is not uneven with respect to the period of the AC voltage from the AC power source 2, so that the current of the rush current can be suppressed. Uneven amount.

After the triac control switch S3 is turned to the ON state at time t3, the signal processing circuit 16 supplies the pulse current that becomes the drive current to the electromagnetic coil L1 via 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 current flowing to the electromagnetic coil L1 from flowing backward, and the diode D4 prevents current from flowing to the electromagnetic coil L2.

As a result, the pulse current flows to the electromagnetic coil L1, and the electromagnetic attraction force temporarily acts, and the contact portion S1 of the first mechanical contact switch 12 is turned on (time t5). Further, since the first mechanical contact switch 12 is of a latch type, the contact portion S1 is kept in an ON state even if no current is supplied to the electromagnetic coil L1.

Further, when the contact portion S1 of the first mechanical contact switch 12 is turned ON at time t5, the current from the AC power source 2 flows to the contact portion S1, and the current does not flow to the three-terminal bidirectional controllable switch. S3. Therefore, in synchronization with the ON state of the contact portion S1 of the first mechanical contact switch 12, at time t5, the T1 electrode-T2 electrode of the triac S3 is turned OFF, that is, three The end bidirectional controllable switch S3 is turned OFF. Moreover, even after the time t5, the contact portion S1 of the first mechanical contact switch 12 is in the ON state, and the electric power from the AC power source 2 to the load 3 is continuously supplied.

After the triac control switch S3 is turned OFF at time t5, the signal processing circuit 16 stops supplying the drive current to the electromagnetic coil L3 of the second mechanical contact switch 13 at time t6. In other words, since the supply of current to the electromagnetic coil L3 is stopped, the electromagnetic attraction force of the electromagnetic coil L3 in the second mechanical contact switch 13 of the rated excitation type is eliminated, and the contact portion of the second mechanical contact switch 13 is eliminated. S2 is turned OFF. Further, after time t5 (for example, time t6), the signal processing circuit 16 also stops supplying the drive current to the light emitting diode LD.

Thereby, after the three-terminal bidirectional control switch S3 is turned OFF, the second mechanical contact switch 13 is turned OFF, so the feed circuit composed of the second mechanical contact switch 13 and the semiconductor switch 14 In the state where no current flows, the contact of the contact portion S2 is OFF. Thereby, in the state where the second mechanical contact switch 13 is OFF, arcing between the contacts of the contact portion S2 can be prevented, so that the joint welding of the second mechanical contact switch 13 can be prevented.

3. The power supply of the hybrid relay 1 is disconnected.

Next, an operation when the power supply is turned off by the power supply of the hybrid relay 1 from the AC power supply 2 to the load 3 or the like is turned off, with reference to the timing chart of FIG. FIG. 3 is a timing chart showing an example of an operation sequence of the hybrid relay 1 when the load 3 is turned off, that is, when the power supply to the load 3 is turned off, by the hybrid relay 1 of the first embodiment.

Further, before the time t7 is reached in FIG. 3, electric power is supplied from the AC power source 2 to the load 3, and the contact portion S1 of the first mechanical contact switch 12 is turned on, and the second mechanical contact switch 13 is connected. The dot portion S2 is in an OFF state, and the semiconductor switch 14 including the three-terminal bidirectional controllable switch S3 is in an OFF state.

Hereinafter, the operation of each part in the hybrid relay 1 when the power supply from the AC power supply 2 to the load 3 is turned off is instructed by the signal processing circuit 16 will be described. As shown in FIG. 3, when the power is supplied from the AC power source 2 to the load 3, the signal processing circuit 16 outputs a signal for supplying a drive current to the electromagnetic coil L3 at time t7. The electromagnetic attraction force is generated in the electromagnetic coil L3 based on the drive current supplied in response to the signal, and the contact portion S2 of the second mechanical contact switch 13 including the electromagnetic 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 is lowered as shown in FIG.

Further, as described above, the 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 series circuit of the optical bidirectional thyristor S4 and the resistor R1. . When the power supply from the AC power supply 2 to the load 3 is disconnected, the snubber circuit can suppress the generation of noise when the contact portion S2 of the second mechanical contact switch 13 is turned on at time t8. The generation of the malfunction of the triac S3 (see FIG. 6) is suppressed. In other words, the hybrid relay 1 of the first embodiment can supply and disconnect the power from the AC power source 2 to the load 3 at an appropriate timing without causing 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 supplies a pulse current serving as a drive current to the electromagnetic coil L2 via 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 current flowing to the electromagnetic coil L2 from flowing backward, and the diode D3 prevents current from flowing to the electromagnetic coil L1. Thereby, the pulse current flows to the electromagnetic coil L2, and the electromagnetic attraction force temporarily acts, and 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 supply 2 flows to the contact portion S2 of the second mechanical contact switch 13, and the current flow includes The semiconductor switch 14 of the three-terminal bidirectional controllable switch S3. Further, the signal processing circuit 16 supplies a drive current to the light-emitting diode LD at time t7. Thereby, a minute voltage wave is applied between the T1 electrode and the T2 electrode of the light bidirectional thyristor S4 before time t9. Therefore, the contact portion S1 of the first mechanical contact switch 12 is substantially synchronized with the OFF state, and the T1 electrode-T2 electrode of the triac S3 is turned ON at time t10.

3, the driving current is supplied to the light-emitting diode LD at time t7. However, if a small voltage is applied between the T1 electrode and the T2 electrode of the optical two-way thyristor S4 before time t9, it may be at time t7. At other times thereafter, a drive current is supplied to the light emitting diode LD.

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

After time t10, the signal processing circuit 16 stops the supply of the drive current to the light-emitting diode LD at time t11. Thereby, the optical bidirectional thyristor S4 is no longer irradiated with the optical signal from the illuminating diode LD, so when the AC voltage from the AC power source 2 becomes the center voltage (time t12), the optical bidirectional thyristor S4 is turned OFF. . In conjunction with the OFF state of the optical bidirectional thyristor S4, the triac is turned OFF, and the semiconductor switch 14 as a whole is turned OFF. Thereby, the feed circuit from the AC power source 2 to the load 3 is turned off, so that the supply of electric power from the AC power source 2 to the load 3 is stopped.

Further, after the supply of the drive current to the light-emitting diode LD is stopped, the signal processing circuit 16 stops supplying the drive current to the electromagnetic coil L3 at time t13. In other words, after the entire semiconductor switch 14 is turned off, the excitation of the electromagnetic 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 as a whole has been turned OFF, and the current does not flow to the second mechanical contact switch 13, the arc does not occur even when the contact of the contact portion S2 is turned OFF. The contact of the second mechanical contact switch 13 can be prevented from being consumed.

As described above, in the hybrid relay 1 of the first embodiment, a snubber circuit including a resistor R2 constituting the semiconductor switch 14 and a parallel connection with the optical bidirectional thyristor S4 is connected in parallel to the first mechanical contact switch 12. A series circuit of capacitors C2 is provided in a connected manner.

Therefore, in the hybrid relay 1 of the first embodiment, the number of components is not increased more than necessary by simply providing the capacitor C2, and the second state is corresponding to the ON state of the second mechanical contact switch 13 When the contact of the mechanical contact switch 13 includes a noise component, the occurrence of malfunction of the semiconductor switch 14 and the load 3 can be effectively suppressed.

<Modification 1 of First Embodiment>

As shown in Fig. 1, the snubber circuit of the hybrid relay 1 of the first embodiment is a capacitor C2 which is provided by a resistor R2 constituting the semiconductor switch 14 and a series circuit connected to the optical bidirectional thyristor S4 and the resistor R1. The series circuit is formed. In order to reduce the number of components of the hybrid relay 1, the circuit configuration of the hybrid relay 1 of the first embodiment is preferable.

However, in the hybrid relay of the present invention, the snubber circuit is not limited to the example formed by the resistor R2 and the capacitor C2. In the first modification of the first embodiment, another example of the formation of the snubber circuit will be described with reference to Fig. 4 .

FIG. 4 is a schematic circuit diagram showing a circuit configuration of a hybrid relay 1a according to a first modification of the first embodiment. In the hybrid relay 1a shown in FIG. 4, the same components as those of the hybrid relay 1 shown in FIG. 1 are denoted by the same reference numerals. Since the operations of the respective portions denoted by the same reference numerals are the same as those of the respective portions of the hybrid relay 1 of the first embodiment, the description of the operations will be omitted.

In the hybrid relay 1a according to the first modification of the first embodiment, a snubber circuit is formed by a series circuit of a resistor R4 and a capacitor C4 provided in parallel with the semiconductor switch 14a. In the hybrid relay 1a according to the first modification of the first embodiment, the resistor R4 and the capacitor C4 are added to increase the number of components, but in the same manner, even in the hybrid relay 1 of the first embodiment. When the second mechanical contact switch 13 is in the ON state and the noise is contained between the contacts of the second mechanical contact switch 13, the occurrence of malfunction of the semiconductor switch 14a and the load 3 can be effectively suppressed.

Specifically, when power is supplied from the AC power source 2 to the load 3, the snubber circuit formed by the resistor R4 and the capacitor C4 can be connected to the contact portion of the second mechanical contact switch 13 at time t1, similarly to FIG. 2 . When S2 is turned to the ON state, the generation of noise is suppressed, and as a result, the occurrence of malfunction of the triac S3 (see FIG. 6) can be suppressed. Similarly, when the power supply from the AC power source 2 to the load 3 is turned off, the snubber circuit can suppress the contact portion S2 of the second mechanical contact switch 13 when the state is turned ON at time t8, similarly to FIG. As a result of the generation of noise, it is possible to suppress the occurrence of malfunction of the triac S3 (see FIG. 6).

Although various embodiments have been described above with reference to the drawings, the hybrid relays 1 and 1a of the present invention are of course not limited to the above examples. It is apparent to those skilled in the art that various modifications and changes can be made without departing from the scope of the invention, and such modifications and modifications are also within the scope of the invention.

For example, although the first mechanical contact switch 12 of the above embodiment has been described as a latch type switch, it may be a rated excitation type switch. In this case, it is necessary to continue supplying a predetermined current from the signal processing circuit 16 to the electromagnetic coil of the first mechanical contact switch 12 while the power supply to the load 3 is being performed, so that the total amount of the drive current of the hybrid relay 1 is Increasing, but the overall structure of the hybrid relay 1 can be miniaturized.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments, and various changes and modifications may be made without departing from the scope of the appended claims. Within the scope of the invention.

1, 1a. . . Hybrid relay

2. . . AC power

3. . . load

10, 11. . . Terminal

12. . . 1st mechanical contact switch

13. . . 2nd mechanical contact switch

14, 14a. . . Semiconductor switch

15. . . Optical two-way thyristor coupler

16. . . Signal processing circuit

S1, S2. . . Contact department

S3‧‧‧ three-terminal two-way controllable switch

S4‧‧‧Light bidirectional thyristor

LD‧‧‧Light Emitting Diode

R1, R2, R3, R4‧‧‧ resistance

C1, C2, C4‧‧‧ capacitors

D1, D2, D3, D4, D5‧‧‧ diodes

L1, L2, L3‧‧‧ electromagnetic coil

G‧‧‧gate electrode

T1, T2‧‧‧ electrodes

Fig. 1 is a schematic circuit diagram showing a circuit configuration of a hybrid relay according to a first embodiment.

FIG. 2 is a timing chart showing an example of an operation sequence of the hybrid relay according to the first embodiment when the load is turned on.

FIG. 3 is a timing chart for explaining an example of an operation sequence of the hybrid relay according to the first embodiment when the load is turned off.

FIG. 4 is a schematic circuit diagram showing a circuit configuration of a hybrid relay according to a modification of the first embodiment.

FIG. 5 is a schematic circuit diagram showing a circuit configuration of a conventional hybrid relay.

FIG. 6 is a timing chart showing an example of an operation sequence of a conventional hybrid relay.

1. . . Hybrid relay

2. . . AC power

3. . . load

10, 11. . . Terminal

12. . . 1st mechanical contact switch

13. . . 2nd mechanical contact switch

14. . . Semiconductor switch

15. . . Optical two-way thyristor coupler

16. . . Signal processing circuit

S1, S2. . . Contact department

S3. . . Three-terminal bidirectional controllable switch

S4. . . Optical two-way thyristor

LD. . . Light-emitting diode

R1, R2. . . resistance

C1, C2. . . Capacitor

D1, D2, D3, D4, D5. . . Dipole

L1, L2, L3. . . Electromagnetic coil

G. . . Gate electrode

T1, T2. . . electrode

Claims (5)

A hybrid relay comprising: a first mechanical contact switch that opens and closes a contact by a first driving unit; and a second mechanical contact switch that is different from the first driving unit by a second a drive unit that opens and closes the contact; and a semiconductor switch that is connected in series with the second mechanical contact switch; and a series connection of the second mechanical contact switch and the semiconductor switch on a feed circuit that supplies power from the power source to the load The circuit is connected in parallel with the first mechanical contact switch, and the second mechanical contact switch and the semiconductor switch are respectively turned on before the contacts of the first mechanical contact switch are closed, and are respectively turned on with respect to the first The mechanical contact switch is connected in parallel with a buffer circuit, wherein the buffer circuit is connected in series by a resistor constituting the semiconductor switch and a capacitor provided in parallel with respect to the optical bidirectional thyristor constituting the semiconductor switch. When the electric power from the power source is supplied to the load or when the supply is disconnected, after the second mechanical contact switch is turned on, The semiconductor switch is turned on, and the snubber circuit is configured to supply electric power from the power source to the load, or to prevent the contact of the second mechanical contact switch from being closed when the load is disconnected from the power source. The noise generated by the time. Such as the hybrid relay described in claim 1 of the patent scope, wherein The resistor constituting the above snubber circuit is a surge resistance. The hybrid relay according to claim 1 or 2, wherein the second mechanical contact switch and the semiconductor switch are respectively turned on before switching the contact of the first mechanical contact switch, and After switching the contacts of the first mechanical contact switch, they become non-conductive. The hybrid relay according to the first or second aspect of the invention, wherein the first mechanical contact switch supplies a current to the first driving unit when the contact of the first mechanical contact switch is opened and closed. Latch-type mechanical contact switch. The hybrid relay according to claim 3, wherein the first mechanical contact switch is a latch type machine that supplies a current to the first drive unit when the contact of the first mechanical contact switch is opened and closed. Contact switch.