A circuit for realizing safety control using relays

Abstract

The present invention provides a circuit for implementing safety control using relays, comprising a first relay, a second relay, a relay controller, a first group of normally closed contact monitoring units for the relay, a second group of normally closed contact monitoring units for the relay, a first power input terminal, a second power input terminal, a first load terminal, a second load terminal, and a microcomputer unit. The present invention provides a circuit for implementing safety control using relays, wherein when voltage is input to the first group of normally closed contact monitoring units for the relay and the second group of normally closed contact monitoring units for the relay, the microcomputer unit monitors the status of the first relay and the second relay. Only when the status of the first relay and the second relay are normal will the microcomputer unit output a high level through the relay controller to control the first relay and the second relay to operate, thereby generating an output voltage for the first relay and the second relay. Otherwise, the first relay and the second relay are prohibited from outputting voltage, thereby achieving safe control of the brake power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator brakes, and in particular to a circuit for realizing safety control by using a relay. Background Art

[0002] At present, elevators are used more and more in people's daily lives. Many shopping malls, residential buildings, and office buildings use elevator systems, and even some factories use elevators to transport goods out of warehouses.

[0003] Then the safety of elevators has attracted more and more attention.

[0004] For traditional elevators, the brake system is extremely complex, making it difficult to reduce costs and difficult to maintain.

[0005] Therefore, it is necessary to provide a circuit for implementing safety control using a relay to solve the above technical problems. Summary of the Invention

[0006] The main technical problem solved by the present invention is to provide a circuit for realizing safety control by using relays. Two groups of relays with switching contacts are adopted. The true state of the normally open contacts is obtained by real-time monitoring of the state of the normally closed contacts of the two groups of relays. When one group of normally open contacts is stuck, the relay can be prevented from operating next time. Therefore, the cost is low and the safety level of the elevator brake is improved.

[0007] To solve the above technical problems, the first technical solution adopted by the present invention is to provide a circuit for implementing safety control using relays, including a relay K1, a relay K2, a relay controller 9, a first group of relay normally closed contact monitoring units 10, a second group of relay normally closed contact monitoring units 11, a power input terminal L, a power input terminal N, a load terminal L0, a load terminal N0, and a microcomputer unit. The relay controller 9 is used to drive the switching contacts of the relay K1 and the relay K2. The control signal input terminal of the relay controller 9, the output terminal of the first group of relay normally closed contact monitoring units 10, and the output terminal of the second group of relay normally closed contact monitoring units 11 are connected to the microcomputer unit.

[0008] Relay 1 K1 includes a normally closed static contact 12, a common moving contact 13 and a normally open static contact 14; relay 2 K2 includes a normally open static contact 25, a common moving contact 26 and a normally closed static contact 27;

[0009] The two input terminals of the first group of normally closed contact monitoring unit 10 of the relay are connected to the common moving contact 1 3 and the normally closed static contact 2 7 respectively. The common moving contact 1 3 is connected to the power input terminal 2 N, and the normally open static contact 2 5 is connected to the load terminal 1 L0.

[0010] The two input terminals of the second group of normally closed contact monitoring unit 11 of the relay are respectively connected to the normally closed static contact 1 2 and the common moving contact 2 6, the common moving contact 2 6 is connected to the power input terminal 1 L, and the normally open static contact 1 4 is connected to the load terminal 2 N0;

[0011] When relay 1 K1 and relay 2 K2 are normal, the control signal input terminal of relay controller 9 inputs a high level, and load terminal 1 L0 and load terminal 2 N0 have voltage output; when at least one normally open static contact of relay 1 K1 and relay 2 K2 is stuck, the microcomputer unit is prohibited from inputting a high level to relay controller 9.

[0012] In one embodiment, the relay controller 9 includes a fifth semiconductor diode D5 and a control signal input terminal CTRL. The two poles of the fifth semiconductor diode D5 are respectively connected to the two winding ends of the relay coil, and the anode of the fifth semiconductor diode D5 is grounded and the cathode is connected to the control signal input terminal CTRL.

[0013] In one embodiment, the relay first group normally closed contact monitoring unit 10 includes a first semiconductor diode D1, a second semiconductor diode D2, a sixth semiconductor diode D6, a seventh semiconductor diode D7, a first capacitor C1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first photocoupler U1, and a first feedback terminal FB1;

[0014] The common movable contact 13 is connected to the cathode of the second semiconductor diode D2 and the anode of the seventh semiconductor diode D7 through the fifth resistor R5;

[0015] The normally closed static contact 2 7 is connected to the cathode of the first semiconductor diode D1 and the anode of the sixth semiconductor diode D6 through the fourth resistor R4;

[0016] The anodes of the first semiconductor diode D1 and the second semiconductor diode D2 are connected to the first capacitor C1 and one end of the third resistor R3 and the cathode of the first photocoupler U1;

[0017] The cathodes of the sixth semiconductor diode D6 and the seventh semiconductor diode D7 are connected to the other end of the first capacitor C1 and one end of the second resistor R2. The other end of the second resistor R2 is connected to the other end of the third resistor R3 and the anode of the first photocoupler U1.

[0018] The emitter of the first photocoupler U1 is grounded, and the collector is connected to the first feedback terminal FB1. The first feedback terminal FB1 is connected to the microcomputer unit.

[0019] In one embodiment, the relay second group normally closed contact monitoring unit 11 includes a third semiconductor diode D3, a fourth semiconductor diode D4, an eighth semiconductor diode D8, a ninth semiconductor diode D9, a second capacitor C2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second photocoupler U2, and a second feedback terminal FB2;

[0020] The second common movable contact 6 is connected to the cathode of the third semiconductor diode D3 and the anode of the eighth semiconductor diode D8 via the ninth resistor R9;

[0021] The normally closed static contact 12 is connected to the cathode of the fourth semiconductor diode D4 and the anode of the ninth semiconductor diode D9 through the tenth resistor R10;

[0022] The anodes of the third semiconductor diode D3 and the fourth semiconductor diode D4 are connected to the second capacitor C2 and one end of the eighth resistor R8, and the cathode of the second photocoupler U2;

[0023] The cathodes of the eighth semiconductor diode D8 and the ninth semiconductor diode D9 are connected to the other end of the second capacitor C2 and one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8 and the anode of the second photocoupler U2.

[0024] The emitter of the second photocoupler U2 is grounded, and the collector is connected to the second feedback terminal FB2. The second feedback terminal FB2 is connected to the microcomputer unit.

[0025] In one embodiment, the microcomputer unit is an elevator control mainboard.

[0026] The beneficial effects of the present invention are:

[0027] (1) Can replace safety relays with forced contact guide structures;

[0028] (2) The true state of the normally open contact is obtained by monitoring the state of the normally closed contact, and the contact state of the relay is monitored in real time. When the normally open contact is stuck, it is prevented from being energized again;

[0029] (3) Used to replace the brake contactor of household ladders. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic structural diagram of a first preferred embodiment of a circuit for implementing safety control using relays according to the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0032] As shown in FIG1 , the circuit for realizing safety control by using relays includes: relay 1 K1, relay 2 K2, relay controller 9, relay first group normally closed contact monitoring unit 10, relay second group normally closed contact monitoring unit 11, power input terminal 1 L, power input terminal 2 N, load terminal 1 L0, load terminal 2 N0, microcomputer unit, relay controller

[0033] 9 is used to drive the switching contacts of relay 1 K1 and relay 2 K2. The control signal input terminal of the relay controller 9, the output terminal of the first group of normally closed contacts monitoring unit 10 of the relay, and the output terminal of the second group of normally closed contacts monitoring unit 11 of the relay are connected to the microcomputer unit;

[0034] Relay 1 K1 includes a normally closed static contact 12, a common moving contact 13 and a normally open static contact 14; relay 2 K2 includes a normally open static contact 25, a common moving contact 26 and a normally closed static contact 27;

[0035] The two input terminals of the first group of normally closed contact monitoring unit 10 of the relay are connected to the common moving contact 1 3 and the normally closed static contact 2 7 respectively. The common moving contact 1 3 is connected to the power input terminal 2 N, and the normally open static contact 2 5 is connected to the load terminal 1 L0.

[0036] The two input terminals of the second group of normally closed contact monitoring unit 11 of the relay are respectively connected to the normally closed static contact 1 2 and the common moving contact 2 6, the common moving contact 2 6 is connected to the power input terminal 1 L, and the normally open static contact 1 4 is connected to the load terminal 2 N0;

[0037] When relay 1 K1 and relay 2 K2 are normal, the control signal input terminal of relay controller 9 inputs a high level, and load terminal 1 L0 and load terminal 2 N0 have voltage output; when at least one normally open static contact of relay 1 K1 and relay 2 K2 is stuck, the microcomputer unit is prohibited from inputting a high level to relay controller 9.

[0038] In one embodiment, the relay controller 9 includes a fifth semiconductor diode D5 and a control signal input terminal CTRL. The two poles of the fifth semiconductor diode D5 are respectively connected to the two winding ends of the relay coil, and the anode of the fifth semiconductor diode D5 is grounded and the cathode is connected to the control signal input terminal CTRL.

[0039] In one embodiment, the relay first group normally closed contact monitoring unit 10 includes a first semiconductor diode D1, a second semiconductor diode D2, a sixth semiconductor diode D6, a seventh semiconductor diode D7, a first capacitor C1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first photocoupler U1, and a first feedback terminal FB1;

[0040] The common movable contact 13 is connected to the cathode of the second semiconductor diode D2 and the anode of the seventh semiconductor diode D7 through the fifth resistor R5;

[0041] The normally closed static contact 2 7 is connected to the cathode of the first semiconductor diode D1 and the anode of the sixth semiconductor diode D6 through the fourth resistor R4;

[0042] The anodes of the first semiconductor diode D1 and the second semiconductor diode D2 are connected to the first capacitor C1 and one end of the third resistor R3 and the cathode of the first photocoupler U1;

[0043] The cathodes of the sixth semiconductor diode D6 and the seventh semiconductor diode D7 are connected to the other end of the first capacitor C1 and one end of the second resistor R2. The other end of the second resistor R2 is connected to the other end of the third resistor R3 and the anode of the first photocoupler U1.

[0044] The emitter of the first photocoupler U1 is grounded, and the collector is connected to the first feedback terminal FB1. The first feedback terminal FB1 is connected to the microcomputer unit.

[0045] In one embodiment, the relay second group normally closed contact monitoring unit 11 includes a third semiconductor diode D3, a fourth semiconductor diode D4, an eighth semiconductor diode D8, a ninth semiconductor diode D9, a second capacitor C2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second photocoupler U2, and a second feedback terminal FB2;

[0046] The second common movable contact 6 is connected to the cathode of the third semiconductor diode D3 and the anode of the eighth semiconductor diode D8 via the ninth resistor R9;

[0047] The normally closed static contact 12 is connected to the cathode of the fourth semiconductor diode D4 and the anode of the ninth semiconductor diode D9 through the tenth resistor R10;

[0048] The anodes of the third semiconductor diode D3 and the fourth semiconductor diode D4 are connected to the second capacitor C2 and one end of the eighth resistor R8, and the cathode of the second photocoupler U2;

[0049] The cathodes of the eighth semiconductor diode D8 and the ninth semiconductor diode D9 are connected to the other end of the second capacitor C2 and one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8 and the anode of the second photocoupler U2.

[0050] The emitter of the second photocoupler U2 is grounded, and the collector is connected to the second feedback terminal FB2. The second feedback terminal FB2 is connected to the microcomputer unit.

[0051] In one embodiment, the microcomputer unit is an elevator control mainboard.

[0052] For the first preferred embodiment of the present invention shown in FIG. 1 , the implemented logic is shown in Table 1.

[0053] Table 1 Logical function table

[0054]

[0055] As shown in Figure 1 and Table 1, in the present invention, power input terminal 1 L and power input terminal 2 N are 220V AC mains power input terminals, but can also be other voltage systems. Load terminal 2 N0 and load terminal 1 L0 are connected to the load device. In the elevator control system, load terminal 2 N0 and load terminal 1 L0 are connected to the input of the brake power supply. Relay 1 K1 and relay 2 K2 can be ordinary relays. The relay's first set of normally closed contact monitoring units 10 is used to monitor the switching status of relay 1 K1 in real time and output feedback signals through the first feedback terminal FB1. The relay's second set of normally closed contact monitoring units 11 is used to monitor the switching status of relay 2 K2 in real time and output feedback signals through the second feedback terminal FB2.

[0056] When relays K1 and K2 are functioning normally, the normally closed contacts of relay K1 are closed, voltage is input to the first and second normally closed contact monitoring units 10 and 11, and the first and second photocouplers U1 and U2 are conducting. The first and second feedback terminals FB1 and FB2 output a low level. If one of the contacts of relays K1 and K2 becomes stuck, the first and second normally closed contact monitoring units 10 and 11 can detect this. The microcomputer control unit then prevents load terminals L0 and N0 from outputting voltage by limiting the output of the control signal input terminal CTRL to a high level, ultimately achieving safe control.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent structures made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of the present invention's patent protection.

Claims

1. A circuit for implementing safety control using a relay, characterized in that: The invention comprises a relay 1 (K1), a relay 2 (K2), a relay controller (9), a relay first group normally closed contact monitoring unit (10), a relay second group normally closed contact monitoring unit (11), a power input terminal 1 (L), a power input terminal 2 (N), a load terminal 1 (L0), a load terminal 2 (N0), and a microcomputer unit. The relay controller (9) is used to drive the switching contacts of the relay 1 (K1) and the relay 2 (K2). The control signal input terminal of the relay controller (9), the output terminal of the relay first group normally closed contact monitoring unit (10), and the output terminal of the relay second group normally closed contact monitoring unit (11) are connected to the microcomputer unit. Relay 1 (K1) includes a normally closed static contact 1 (2), a common moving contact 1 (3) and a normally open static contact 1 (4), and relay 2 (K2) includes a normally open static contact 2 (5), a common moving contact 2 (6) and a normally closed static contact 2 (7); The two input terminals of the first group of normally closed contact monitoring units (10) of the relay are connected to the common moving contact 1 (3) and the normally closed static contact 2 (7) respectively. The common moving contact 1 (3) is connected to the power input terminal 2 (N), and the normally open static contact 2 (5) is connected to the load terminal 1 (L0). The two input terminals of the second group of normally closed contact monitoring units (11) of the relay are connected to the normally closed static contact 1 (2) and the common moving contact 2 (6) respectively. The common moving contact 2 (6) is connected to the power input terminal 1 (L), and the normally open static contact 1 (4) is connected to the load terminal 2 (N0). When relay 1 (K1) and relay 2 (K2) are normal, a high level is input to the control signal input terminal of the relay controller (9), and a voltage is output at the load terminal 1 (L0) and the load terminal 2 (N0); when at least one of the normally open static contacts of relay 1 (K1) and relay 2 (K2) is stuck, the microcomputer unit is prohibited from inputting a high level to the relay controller (9).

2. The circuit for implementing safety control using a relay according to claim 1, characterized in that: The relay controller (9) comprises a fifth semiconductor diode (D5) and a control signal input terminal (CTRL). The two poles of the fifth semiconductor diode (D5) are respectively connected to the two winding ends of the relay coil, and the anode of the fifth semiconductor diode (D5) is grounded and the cathode is connected to the control signal input terminal (CTRL).

3. The circuit for realizing safety control by using a relay according to claim 2, characterized in that In, A relay first group normally closed contact monitoring unit (10) comprises a first semiconductor diode (D1), a second semiconductor diode (D2), a sixth semiconductor diode (D6), a seventh semiconductor diode (D7), a first capacitor (C1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a first photocoupler (U1), and a first feedback terminal (FB1); The common movable contact 1 (3) is connected to the cathode of the second semiconductor diode (D2) and the anode of the seventh semiconductor diode (D7) through the fifth resistor (R5); The normally closed static contact 2 (7) is connected to the cathode of the first semiconductor diode (D1) and the anode of the sixth semiconductor diode (D6) through the fourth resistor (R4); The anodes of the first semiconductor diode (D1) and the second semiconductor diode (D2) are connected to one end of the first capacitor (C1) and the third resistor (R3), and the negative electrode of the first photoelectric coupler (U1); The cathodes of the sixth semiconductor diode (D6) and the seventh semiconductor diode (D7) are connected to the other end of the first capacitor (C1) and one end of the second resistor (R2), and the other end of the second resistor (R2) is connected to the other end of the third resistor (R3) and the positive electrode of the first photoelectric coupler (U1); The emitter of the first photocoupler (U1) is grounded, the collector is connected to the first feedback terminal (FB1), and the first feedback terminal (FB1) is connected to the microcomputer unit.

4. The circuit for implementing safety control using a relay according to claim 3, characterized in that: The second group of normally closed contact monitoring units (11) of the relay includes a third semiconductor diode (D3), a fourth semiconductor diode (D4), an eighth semiconductor diode (D8), a ninth semiconductor diode (D9), a second capacitor (C2), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), a second photoelectric coupler (U2), and a second feedback terminal (FB2); The second common moving contact (6) is connected to the cathode of the third semiconductor diode (D3) and the anode of the eighth semiconductor diode (D8) through the ninth resistor (R9); The normally closed static contact 1 (2) is connected to the cathode of the fourth semiconductor diode (D4) and the anode of the ninth semiconductor diode (D9) through the tenth resistor (R10); The anodes of the third semiconductor diode (D3) and the fourth semiconductor diode (D4) are connected to one end of the second capacitor (C2) and the eighth resistor (R8), and the negative electrode of the second photoelectric coupler (U2); The cathodes of the eighth semiconductor diode (D8) and the ninth semiconductor diode (D9) are connected to the second The other end of the capacitor (C2) and one end of the seventh resistor (R7) are connected, and the other end of the seventh resistor (R7) is connected to the other end of the eighth resistor (R8) and the positive electrode of the second photoelectric coupler (U2); The emitter of the second photocoupler (U2) is grounded, the collector is connected to the second feedback terminal (FB2), and the second feedback terminal (FB2) is connected to the microcomputer unit.

5. The circuit for implementing safety control using a relay according to any one of claims 1 to 4, characterized in that: The microcomputer unit is the elevator control mainboard.

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