A combination relay

Abstract

The present invention provides a combined relay that combines a solid-state relay with an electromagnetic relay and an off-delay relay, thereby achieving less arcing and sparking during use, eliminating the high heat generation associated with using a solid-state relay alone, and eliminating the need for a timing chip or a heat sink. The combined relay has the advantages of low cost, ease of production, less arcing and sparking, long life, low heat generation, high load, low-voltage control, and high-load current reaching zero amperes after power failure, and a small size. The combined relay is primarily used in scenarios requiring high circuit stability and frequent switching.

Description

Technical Field

[0001] The purpose of the present invention is to provide a combined relay that combines a solid-state relay with an electromagnetic relay to achieve less arcing and sparking during use, without the high heat generation when using a solid-state relay alone, without using a timing chip or a heat sink, and has the characteristics of low cost, easy production, less arcing and sparking, long life, low heat generation, and small size. It is mainly used in scenarios with high requirements for circuit stability and frequent switching. Background Art

[0002] Currently, relays are mainly divided into solid-state relays and electromagnetic relays. Solid-state relays have the disadvantages of severe heat generation and large size after installing a heat sink, while electromagnetic relays have the disadvantages of arcing and sparking when operating, resulting in a short lifespan. Currently, there are solutions that combine solid-state relays with electromagnetic relays, but the use of timing chips to control multiple circuits has the disadvantages of high cost and complex structure. The present invention provides a relay that combines a solid-state relay and an electromagnetic relay without using a timing chip, which has the characteristics of low cost, easy production, less arcing and sparking, long life, low heat generation, and small size. Summary of the Invention

[0003] The present invention provides a relay that combines a solid-state relay and an electromagnetic relay without using a timing chip. The purpose is achieved by mainly changing the current in the circuit through capacitance or inductance, so that the solid-state relay and the electromagnetic relay have different closing or opening times.

[0004] The invention comprises a solid-state relay; a first low-load terminal of the solid-state relay; a second low-load terminal of the solid-state relay; a first resistor; a first low-load terminal of the electromagnetic relay; a second low-load terminal of the electromagnetic relay; an electromagnetic relay; a first high-load circuit; a first high-load terminal; a second high-load terminal; a second high-load circuit; a first high-load terminal of the electromagnetic relay; a second high-load terminal of the electromagnetic relay; a high-load second terminal of the electromagnetic relay; a first high-load terminal of the solid-state relay; a second high-load terminal of the solid-state relay; a first low-load terminal; a first low-load circuit; a second low-load terminal; a second resistor; a second low-load circuit; a capacitor; and a third resistor, wherein the first low-load terminal of the solid-state relay and the second low-load terminal of the solid-state relay are respectively connected to the second low-load terminal of the electromagnetic relay and the first low-load terminal of the electromagnetic relay on the electromagnetic relay through a conductor. A first resistor is installed on the connection line between the low-load first terminal of the solid-state relay and the low-load second terminal of the electromagnetic relay. The high-load first terminal of the solid-state relay and the high-load second terminal of the solid-state relay are directly connected to the high-load second terminal of the electromagnetic relay and the high-load first terminal of the electromagnetic relay respectively through conductors. One end of the low-load second circuit is connected to the low-load first terminal of the solid-state relay, and one end is connected to the second resistor. The other end of the second resistor is connected to the low-load second terminal. One end of the low-load first circuit is connected to the low-load second terminal of the solid-state relay, and one end is connected to the low-load first terminal. A capacitor is connected between the low-load first terminal and the low-load second circuit. One end of the externally controlled high-load circuit is connected to the high-load first terminal, and one end is connected to the high-load second terminal. The power of the solid-state relay used is smaller than the power of the electromagnetic relay.

[0005] One end of the high-load first circuit is connected to the high-load second terminal of the electromagnetic relay, and the other end is connected to the high-load first terminal. One end of the high-load second circuit is connected to the high-load first terminal of the electromagnetic relay, and the other end is connected to the high-load second terminal. Direct current is applied to the low-load second terminal and the low-load first terminal, charging the capacitor. The current reaching the low-load first terminal and the low-load second terminal of the solid-state relay slowly increases. The power required to operate the solid-state relay is lower than that required to operate the electromagnetic relay. The first resistor acts as a barrier to the current passing through the electromagnetic relay. During the rising current, the solid-state relay operates first, followed by the electromagnetic relay, closing the normally open contacts. When the electromagnetic relay closes, the high-load circuit controlled by the combination relay is already open. Therefore, the probability of arcing when the contacts of the electromagnetic relay close is minimal. After the contacts of the electromagnetic relay close, the high-load first terminal of the solid-state relay and the high-load second terminal of the solid-state relay are connected. The solid-state relay does not bear the load, which can greatly reduce the heat generated by the solid-state relay. The solid-state relay does not require a heat sink, thus reducing its size.

[0006] When DC power is applied to the low-load second terminal and the low-load first terminal and then disconnected, the capacitor discharges, and the current discharged decreases gradually. The power of the solid-state relay is smaller than that of the electromagnetic relay. The first resistor has an obstructive effect on the current passing through the electromagnetic relay. The electromagnetic relay will first operate to disconnect the closed contacts. At this time, the solid-state relay bears the high load in the disconnection circuit. Therefore, the probability of arcing when the contacts on the electromagnetic relay are disconnected is very small. After the electromagnetic relay is disconnected, the current discharged by the capacitor continues to decrease, and then the solid-state relay operates to disconnect the high-load circuit controlled by this combination relay.

[0007] Replacing the second resistor with a diode or a diode connected in series at one end can prevent the current from flowing to the low-load first terminal or the low-load second terminal when the capacitor is discharged.

[0008] A third resistor is connected in series on the line between the capacitor and the first low-load terminal of the solid-state relay or the second low-load terminal of the solid-state relay, so as to prolong the discharge time of the capacitor.

[0009] The resistance values of the third resistor, the first resistor, and the second resistor are all between zero ohms and eight thousand ohms. When the resistance value of the second resistor is zero ohms, that is, when the second resistor does not exist, the power supply originally connected to the low-load first terminal and the low-load second terminal is directly connected to the low-load first terminal and the low-load second terminal of the solid-state relay.

[0010] When the low-load first terminal and the low-load second terminal are connected to AC low voltage power, the capacitor is not installed in the circuit, and an inductor is installed between the low-load first line or the low-load second line.

[0011] A disconnect delay relay is installed on the high-load first circuit or the high-load second circuit. The high-load first circuit or the high-load second circuit is cut and connected to the two ends of the high load of the disconnect delay relay. The low-voltage control end of the disconnect delay relay is connected to the low-load first terminal and the low-load second terminal. When the low-load first terminal and the low-load second terminal are powered on, the disconnect delay relay operates to close the contacts. When the low-load first terminal and the low-load second terminal are de-energized, the disconnect delay relay passes through a delay element and disconnects after a delay, so that the current passing through the circuit with high load controlled by this combination relay reaches zero ampere.

[0012] The electromagnetic relay is replaced with a holding relay, which controls the closing and opening of its contacts by changing the current direction on the low-load first terminal and the low-load second terminal.

[0013] There are one or more groups of controlled high-load binding posts on the electromagnetic relay and solid-state relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation scheme of the present invention, the specific drawings of the scheme will be described below.

[0015] Figure 1 It is the structural front view of the present invention.

[0016] In the figure: housing 1; solid-state relay 2; solid-state relay low-load first terminal 3; solid-state relay low-load second terminal 4; first resistor 5; electromagnetic relay low-load first terminal 6; electromagnetic relay low-load second terminal 7; electromagnetic relay 8; high-load first circuit 9; high-load first terminal 10; high-load second terminal 11; high-load second circuit 12; electromagnetic relay high-load first terminal 13; electromagnetic relay high-load second terminal 14; solid-state relay high-load first terminal 15; solid-state relay high-load second terminal 16; low-load first terminal 17; low-load first circuit 18; low-load second terminal 19; second resistor 20; low-load second circuit 21; capacitor 22; third resistor 23. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] The solid-state relay low-load first terminal 3 and the solid-state relay low-load second terminal 4 on the solid-state relay 2 are respectively connected to the electromagnetic relay low-load second terminal 7 and the electromagnetic relay low-load first terminal 6 on the electromagnetic relay 8 through conductors. A first resistor 5 is installed on the connection line between the solid-state relay low-load first terminal 3 and the electromagnetic relay low-load second terminal 7. The solid-state relay high-load first terminal 15 and the solid-state relay high-load second terminal 16 on the solid-state relay 2 are respectively directly connected to the electromagnetic relay high-load second terminal 14 and the electromagnetic relay high-load first terminal 13 through conductors. One end of the low-load second line 21 is connected to the low-load first terminal 3 of the solid-state relay, and one end is connected to the second resistor 20. The other end of the second resistor 20 is connected to the low-load second terminal 19. One end of the low-load first line 18 is connected to the low-load second terminal 4 of the solid-state relay, and one end is connected to the low-load first terminal 17. A capacitor 22 is connected between the low-load first terminal 17 and the low-load second line 21. One end of the externally controlled high-load circuit is connected to the high-load first terminal 10, and one end is connected to the high-load second terminal 11. The power of the solid-state relay 2 used is smaller than the power of the electromagnetic relay 8.

[0019] One end of the high-load first line 9 is connected to the high-load second terminal 14 of the electromagnetic relay, and the other end is connected to the high-load first terminal 10. One end of the high-load second line 12 is connected to the high-load first terminal 13 of the electromagnetic relay, and the other end is connected to the high-load second terminal 11. DC power is applied to the low-load second terminal 19 and the low-load first terminal 17, and the capacitor 22 is charged. The current reaching the low-load first terminal 3 of the solid-state relay and the low-load second terminal 4 of the solid-state relay has a slow rising process. The power of the solid-state relay 2 is smaller than the power of the electromagnetic relay 8. The first resistor 5 has a resistance to the current passing through the electromagnetic relay 8. The solid-state relay 2 has an obstructive effect on the current. During the rising process of the current, the solid-state relay 2 is actuated first, and then the electromagnetic relay 8 is actuated to close the normally open contact. When the electromagnetic relay 8 is closed, the high-load circuit controlled by the combination relay is already connected. Therefore, the probability of arcing when the contacts on the electromagnetic relay 8 are closed is very small. After the contacts on the electromagnetic relay 8 are closed, the solid-state relay high-load first terminal 15 and the solid-state relay high-load second terminal 16 on the solid-state relay 2 are connected. The solid-state relay 2 does not bear the load, which can greatly reduce the heat generated by the solid-state relay 2. The solid-state relay 2 does not need to be installed with a radiator, which reduces the volume.

[0020] When the DC power is applied to the low-load second terminal 19 and the low-load first terminal 17 and then disconnected, the capacitor 22 discharges, and the discharged current decreases gradually. The power of the solid-state relay 2 is smaller than the power of the electromagnetic relay 8. The first resistor 5 has an obstructive effect on the current passing through the electromagnetic relay 8. The electromagnetic relay 8 will first operate to open the closed contacts. At this time, the solid-state relay 2 bears the high load in the disconnection circuit. Therefore, the probability of arcing when the contacts on the electromagnetic relay 8 are disconnected is very small. After the electromagnetic relay 8 is disconnected, the current discharged by the capacitor 22 continues to decrease, and then the solid-state relay 2 operates to disconnect the high-load circuit controlled by this combination relay.

[0021] The second resistor 20 is replaced with a diode or a diode connected in series at one end, so as to prevent the current from flowing to the low-load first terminal 17 or the low-load second terminal 19 when the capacitor 22 is discharged.

[0022] A third resistor 23 is connected in series on the line between the capacitor 22 and the solid-state relay low-load first terminal 3 or the solid-state relay low-load second terminal 4 to extend the discharge time of the capacitor 22 .

[0023] The resistance values of the third resistor 23, the first resistor 5, and the second resistor 20 are all between zero ohms and eight kiloohms. When the resistance value of the second resistor 20 is zero ohms, that is, when the second resistor 20 does not exist, the power originally connected to the low-load first terminal 17 and the low-load second terminal 19 is directly connected to the solid-state relay low-load first terminal 3 and the solid-state relay low-load second terminal 4.

[0024] When the low-load first terminal 17 and the low-load second terminal 19 are connected to AC low voltage power, the capacitor 22 is not installed in the circuit, and an inductor is installed between the low-load first line 18 or the low-load second line 21.

[0025] A disconnect delay relay is installed on the high-load first circuit 9 or the high-load second circuit 12. The high-load first circuit 9 or the high-load second circuit 12 is cut and connected to the two ends of the high load of the disconnect delay relay. The low-voltage control end of the disconnect delay relay is connected to the low-load first terminal 17 and the low-load second terminal 19. When the low-load first terminal 17 and the low-load second terminal 19 are powered on, the disconnect delay relay is activated to close the contacts immediately. When the low-load first terminal 17 and the low-load second terminal 19 are de-energized, the disconnect delay relay passes through a delay element and disconnects after a delay, so that the current passing through the circuit with high load controlled by this combination relay reaches zero amperes.

[0026] The electromagnetic relay 8 is replaced with a holding relay, which controls the closing and opening of its contacts by changing the current direction on the low-load first terminal 17 and the low-load second terminal 19.

[0027] There is one or more groups of controlled high-load terminals on the electromagnetic relay 8 and the solid-state relay 2.

[0028] The present invention can effectively reduce the arcing and sparking phenomenon of ordinary electromagnetic relays, but it still has a mechanical contact switch and is not suitable for high-dust scenes, mining operations, or other scenes that are sensitive to electric sparks.

[0029] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A combination relay, which mainly comprises a housing (1); a solid-state relay (2); a low-load first terminal (3) of the solid-state relay; a low-load second terminal (4) of the solid-state relay; a first resistor (5); a low-load first terminal (6) of the electromagnetic relay; a low-load second terminal (7) of the electromagnetic relay; an electromagnetic relay (8); a high-load first circuit (9); a high-load first terminal (10); a high-load second terminal (11); a high-load second circuit (12); a high-load first terminal (13) of the electromagnetic relay; a high-load second terminal (14) of the electromagnetic relay; a high-load first terminal (15) of the solid-state relay; a high-load second terminal (16) of the solid-state relay; a low-load first terminal (17); a low-load first circuit (18); a low-load second terminal (19); a second resistor (20); a low-load second circuit (21); a capacitor (22); and a third resistor (23), characterized in that: The solid-state relay low-load first terminal (3) and the solid-state relay low-load second terminal (4) on the solid-state relay (2) are respectively connected to the electromagnetic relay low-load second terminal (7) and the electromagnetic relay low-load first terminal (6) on the electromagnetic relay (8) through conductors. A first resistor (5) is installed on the connection line between the solid-state relay low-load first terminal (3) and the electromagnetic relay low-load second terminal (7). The solid-state relay high-load first terminal (15) and the solid-state relay high-load second terminal (16) on the solid-state relay (2) are respectively directly connected to the electromagnetic relay high-load second terminal (14) and the electromagnetic relay high-load first terminal (13) through conductors. One end of the low-load second circuit (21) is connected to the low-load first terminal (3) of the solid-state relay, and one end is connected to the second resistor (20). The other end of the second resistor (20) is connected to the low-load second terminal (19). One end of the low-load first circuit (18) is connected to the low-load second terminal (4) of the solid-state relay, and one end is connected to the low-load first terminal (17). A capacitor (22) is connected between the low-load first terminal (17) and the low-load second circuit (21). One end of the externally controlled high-load circuit is connected to the high-load first terminal (10) and one end is connected to the high-load second terminal (11). The power of the solid-state relay (2) is smaller than the power of the electromagnetic relay (8).

2. A combination relay according to claim 1, characterized in that: One end of the high-load first circuit (9) is connected to the high-load second terminal (14) of the electromagnetic relay, and the other end is connected to the high-load first terminal (10). One end of the high-load second circuit (12) is connected to the high-load first terminal (13) of the electromagnetic relay, and the other end is connected to the high-load second terminal (11). A direct current is applied to the low-load second terminal (19) and the low-load first terminal (17), and the capacitor (22) is charged. The current reaching the low-load first terminal (3) of the solid-state relay and the low-load second terminal (4) of the solid-state relay has a slowly rising process. The power of the solid-state relay (2) is smaller than the power of the electromagnetic relay (8). The first resistor (5) is connected to the current passing through the electromagnetic relay ( 8) has an obstructive effect on the current. During the rising process of the current, the solid-state relay (2) is actuated first, and then the electromagnetic relay (8) is actuated to close the normally open contact. When the electromagnetic relay (8) is closed, the high-load circuit controlled by the combined relay is already connected. Therefore, the probability of arcing and sparking when the contacts on the electromagnetic relay (8) are closed is very small. After the contacts on the electromagnetic relay (8) are closed, the solid-state relay high-load first terminal (15) and the solid-state relay high-load second terminal (16) on the solid-state relay (2) are connected. The solid-state relay (2) does not bear the load, which can greatly reduce the heat generated by the solid-state relay (2). The solid-state relay (2) does not need to be equipped with a radiator, which reduces the volume.

3. A combination relay according to claim 1, characterized in that: When the low-load second terminal (19) and the low-load first terminal (17) are connected to direct current and then disconnected, the capacitor (22) discharges, and the discharged current has a process from large to small. The power of the solid-state relay (2) is smaller than the power of the electromagnetic relay (8). The first resistor (5) has an obstructive effect on the current passing through the electromagnetic relay (8). The electromagnetic relay (8) will first operate to disconnect the closed contacts. At this time, the solid-state relay (2) bears the high load in the disconnect circuit. Therefore, the probability of arcing and sparking when the contacts on the electromagnetic relay (8) are disconnected is very small. After the electromagnetic relay (8) is disconnected, the current discharged by the capacitor (22) continues to decrease, and then the solid-state relay (2) operates to disconnect the high-load circuit controlled by the combination relay.

4. A combination relay according to claim 1, characterized in that: The second resistor (20) is replaced with a diode or a diode connected in series at one end, so as to prevent the current of the capacitor (22) from flowing to the low-load first terminal (17) or the low-load second terminal (19) when the capacitor (22) is discharged.

5. A combination relay according to claim 1, characterized in that: A third resistor (23) is connected in series on a line between the capacitor (22) and the solid-state relay low-load first terminal (3) or the solid-state relay low-load second terminal (4), thereby extending the discharge time of the capacitor (22).

6. A combination relay according to claim 1, characterized in that: The resistance values of the third resistor (23), the first resistor (5) and the second resistor (20) are all between zero ohm and eight thousand ohms. When the resistance value of the second resistor (20) is zero ohm, that is, when the second resistor (20) does not exist, the power supply originally connected to the low-load first terminal (17) and the low-load second terminal (19) is directly connected to the solid-state relay low-load first terminal (3) and the solid-state relay low-load second terminal (4).

7. The combination relay according to claim 1, characterized in that: When the low-load first terminal (17) and the low-load second terminal (19) are connected to AC low voltage electricity, the capacitor (22) is not installed in the circuit, and an inductor is installed between the low-load first line (18) or the low-load second line (21).

8. The combination relay according to claim 1, characterized in that: A disconnect delay relay is installed on the high-load first circuit (9) or the high-load second circuit (12). The high-load first circuit (9) or the high-load second circuit (12) is cut and connected to the two ends of the high load of the disconnect delay relay. The low-voltage control end of the disconnect delay relay is connected to the low-load first terminal (17) and the low-load second terminal (19). When the low-load first terminal (17) and the low-load second terminal (19) are powered, the disconnect delay relay operates to close the contacts. When the low-load first terminal (17) and the low-load second terminal (19) are de-energized, the disconnect delay relay passes through a delay element and disconnects after a delay, so that the current passing through the circuit controlled by the combined relay with a high load reaches zero ampere.

9. The combination relay according to claim 1, characterized in that: The electromagnetic relay (8) is replaced with a holding relay, which controls the closing and opening of its contacts by changing the current direction on the low-load first terminal (17) and the low-load second terminal (19).

10. The combination relay according to claim 1, characterized in that: One or more groups of controlled high-load binding posts are provided on the electromagnetic relay (8) and the solid-state relay (2).

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