Power supply circuit, control circuit and elevator

Abstract

The application relates to a power supply circuit, a control circuit and an elevator. The power supply circuit comprises a first switching element, a first end of the first switching element being used for connecting one end of a brake coil; a control end of the first switching element being used for connecting a loop of a control power supply; a second switching element, a first end of the second switching element being used for connecting the other end of the brake coil; a control end of the second switching element being used for connecting the loop of the control power supply; a first relay, one end of a normally open contact of the first relay being connected to a second end of the second switching element; the other end of the normally open contact of the first relay being used for connecting a brake power supply; a second relay, one end of a normally open contact of the second relay being connected to a second end of the first switching element; the other end of the normally open contact of the second relay being used for connecting the brake power supply. The power supply circuit can reduce noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the elevator technical field, and particularly relates to a power supply circuit, a control circuit and an elevator. BACKGROUND

[0002] At present, for the power supply control of the brake of the elevator, two contactors are usually used, and the normally open contact points of the two contactors are connected in series on the power supply circuit of the brake. The coils of the two contactors are powered by a safety circuit. When the safety circuit is disconnected, the coil of the contactor loses power, the normally open contact point of the contactor is disconnected, the power supply of the brake is cut off, and thus the brake is released to stop the elevator.

[0003] However, the current elevator braking method or traditional method has problems such as large noise of the contactor. SUMMARY

[0004] Therefore, it is necessary to provide a power supply circuit, a control circuit and an elevator capable of reducing noise in view of the above technical problems.

[0005] In a first aspect, the present application provides a power supply circuit, which comprises:

[0006] a first switching element, a first end of the first switching element being used for connecting one end of a brake coil; and a control end of the first switching element being used for connecting a loop of a control power supply;

[0007] a second switching element, a first end of the second switching element being used for connecting the other end of the brake coil; and a control end of the second switching element being used for connecting the loop of the control power supply;

[0008] a first relay, one end of a normally open contact point of the first relay being connected to a second end of the second switching element; and the other end of the normally open contact point of the first relay being used for connecting a brake power supply;

[0009] a second relay, one end of a normally open contact point of the second relay being connected to a second end of the first switching element; and the other end of the normally open contact point of the second relay being used for connecting the brake power supply.

[0010] In one of the embodiments, the first relay comprises a first coil; the second relay comprises a second coil; and the power supply circuit further comprises:

[0011] a third relay, the third relay comprising a first normally open contact point and a second normally open contact point; the first normally open contact point being used for conducting the first coil; and the second normally open contact point being used for conducting the second coil.

[0012] In one of the embodiments, one end of the first coil is connected to the first end of the first switching element, a second end of the first switching element is used for connecting a detection power supply; and the other end of the first coil is used for connecting the detection power supply.

[0013] One end of the second coil is connected to the second end of the second switch element, and the first end of the second switch element is used for connecting the detection power supply; the other end of the second coil is used for connecting the detection power supply.

[0014] In one of the embodiments, the first normally open contact is connected in parallel with the first switch element; the second normally open contact is connected in parallel with the second switch element; one end of the normally closed contact of the third relay is connected to the second end of the second switch element; the other end of the normally closed contact of the third relay is connected to one end of the normally open contact of the first relay.

[0015] In one of the embodiments, the control end of the first switch element and the first end of the first switch element are both used for connecting the control power supply.

[0016] The control end of the second switch element and the second end of the second switch element are both used for connecting the control power supply.

[0017] In one of the embodiments, the first switch element and the second switch element are semiconductor switch elements.

[0018] In the second aspect, the application provides a control circuit, which comprises:

[0019] A first switch power supply, and an output end of the first switch power supply is used for connecting a loop of the control power supply.

[0020] A first relay, and one end of a normally open contact of the first relay is used for connecting a safety loop.

[0021] A second relay, and one end of a normally open contact of the second relay is connected to the other end of the normally open contact of the first relay; the other end of the normally open contact of the second relay is connected to an input end of the first switch power supply.

[0022] In one of the embodiments, the control circuit further comprises:

[0023] A third relay, and the third relay comprises a third coil; one end of the third coil is used for connecting a power supply of the safety loop; the other end of the third coil is used for connecting the safety loop in sequence through a normally closed contact of the second relay and a normally closed contact of the first relay; one end of the normally closed contact of the third relay is connected to the other end of the normally open contact of the second relay, and the other end of the normally closed contact of the third relay is connected to the input end of the first switch power supply.

[0024] In one of the embodiments, the control circuit further comprises:

[0025] A second switch power supply, and an input end of the second switch power supply is used for connecting the power supply of the safety loop; an output end of the second switch power supply is used for connecting the detection power supply.

[0026] In a third aspect, the application provides an elevator, the elevator comprising a safety circuit, a control power supply and a brake; the brake comprising a brake coil and a brake power supply; the elevator further comprising:

[0027] a first switch element, a first end of the first switch element being connected to one end of the brake coil; a control end of the first switch element being connected to the circuit of the control power supply;

[0028] a second switch element, a first end of the second switch element being connected to the other end of the brake coil; a control end of the second switch element being connected to the circuit of the control power supply;

[0029] a first switch power supply, an output end of the first switch power supply being connected to the circuit of the control power supply;

[0030] a first relay, the first relay comprising a third normally open contact and a fourth normally open contact; one end of the third normally open contact being connected to a second end of the second switch element; the other end of the third normally open contact being connected to the brake power supply; one end of the fourth normally open contact being connected to the safety circuit;

[0031] a second relay, the second relay comprising a fifth normally open contact and a sixth normally open contact; one end of the fifth normally open contact being connected to a second end of the first switch element; the other end of the fifth normally open contact being connected to the brake power supply; one end of the sixth normally open contact being connected to the other end of the fourth normally open contact; the other end of the sixth normally open contact being connected to an input end of the first switch power supply.

[0032] The power supply circuit, the control circuit and the elevator, the power supply circuit comprises: a first switching element, a first end of the first switching element is used for connecting one end of the brake coil; the control end of the first switching element is used for connecting the loop of the control power supply; a second switching element, a first end of the second switching element is used for connecting the other end of the brake coil; the control end of the second switching element is used for connecting the loop of the control power supply; a first relay, one end of the normally open contact of the first relay is connected to the second end of the second switching element; the other end of the normally open contact of the first relay is used for connecting the brake power supply; a second relay, one end of the normally open contact of the second relay is connected to the second end of the first switching element; the other end of the normally open contact of the second relay is used for connecting the brake power supply. The power supply circuit can realize that both ends of the brake coil are connected with the brake power supply under the action of the corresponding control circuit, the loop in which the brake coil is located is completely conducted, the brake coil is powered, and then the brake is opened. The control circuit comprises: a first switching power supply, the output end of the first switching power supply is used for connecting the loop of the control power supply; a first relay, one end of the normally open contact of the first relay is used for connecting the safety loop; a second relay, one end of the normally open contact of the second relay is connected to the other end of the normally open contact of the first relay; the other end of the normally open contact of the second relay is connected to the input end of the first switching power supply. Through the control circuit, the power supply circuit can be controlled when the safety circuit is connected, so that the brake coil is powered on and the safety circuit is not connected, the brake coil is powered off, a contactor is not used, an elevator programmable electronic safety system is not used, the circuit elements are few, the structure is simple, the cost is low, the elevator noise is effectively reduced, the safety and stability of operation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structural block diagram of the power supply circuit in one embodiment is shown in the figure;

[0034] Figure 2 The structural block diagram of the power supply circuit in another embodiment is shown in the figure;

[0035] Figure 3 The structural block diagram of the power supply circuit in another embodiment is shown in the figure;

[0036] Figure 4 The structural block diagram of the power supply circuit in one embodiment is shown in the figure;

[0037] Figure 5 The structural block diagram of the control circuit in one embodiment is shown in the figure;

[0038] Figure 6 The structural block diagram of the control circuit in another embodiment is shown in the figure;

[0039] Figure 7A structural block diagram of a circuit of an elevator in one embodiment;

[0040] Figure 8 A structural block diagram of a circuit of an elevator in another embodiment. DETAILED DESCRIPTION

[0041] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0042] At present, the scheme of using a contactor to control the power supply of the brake of an elevator has some deficiencies, for example, the noise generated by the action of the contactor is too large, the volume of the contactor is large, thereby making it difficult to further reduce the volume of the control cabinet, the action of the contactor is stuck, thereby increasing the failure, the electrical life of the contactor is short, thereby affecting the overall life of the elevator, etc. In the above background, with the popularization of the programmable electronic safety system (PESSRAL) of the elevator, in recent years, the contactor-free technical scheme based on the programmable electronic safety system of the elevator has gradually emerged, which adopts a multi-channel redundant structure, carries two or more programmable systems to realize low failure rate, and the technical scheme based on the programmable electronic safety system of the elevator can realize the contactor-free brake power supply control, but the extremely complex multi-channel system often brings high failure rate and high cost.

[0043] In one embodiment, as shown in Figure 1 a power supply circuit is provided, the power supply circuit comprising:

[0044] a first switching element 110, a first end of the first switching element 110 being used to connect one end of a brake coil; a control end of the first switching element 110 being used to access a loop of a control power supply;

[0045] a second switching element 120, a first end of the second switching element 120 being used to connect the other end of the brake coil; a control end of the second switching element 120 being used to access the loop of the control power supply;

[0046] a first relay 130, one end of a normally open contact of the first relay 130 being connected to a second end of the second switching element 120; the other end of the normally open contact of the first relay 130 being used to connect a brake power supply;

[0047] a second relay 140, one end of a normally open contact of the second relay 140 being connected to a second end of the first switching element 110; the other end of the normally open contact of the second relay 140 being used to connect the brake power supply.

[0048] Specifically, in the case that the coil of the first relay 130 and the coil of the second relay 140 are powered, the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are both closed. The first switch element 110 and the second switch element 120 can be used to control the current flow and realize switching of the switch state. Further, in the case that the loop of the control power supply is turned on, the first switch element 110 and the second switch element 120 can be closed, and then the two ends of the brake coil are connected to the brake power supply, the loop in which the brake coil is located is completely turned on, the brake coil is powered, and the brake is opened.

[0049] Further, by controlling the loop of the control power supply to be disconnected, the control end of the first switch element 110 and the control end of the second switch element 120 are both powered off, the first switch element 110 and the second switch element 120 are both disconnected, the loop in which the brake coil is located is disconnected, and the power supply circuit cannot supply power to the brake coil; further, by controlling the coil of the first relay 130 and the coil of the second relay 140 to be powered off, the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are both reset to maintain the disconnected state of the power supply circuit.

[0050] In some examples, the control end of the first switch element 110 can be connected to a first control power supply loop; the control end of the second switch element 120 can be connected to a second control power supply loop; the first control power supply loop and the second control power supply loop can be the same control power supply loop, or can be two control power supply loops. The other end of the normally open contact of the first relay 130 can be used to connect one pole (for example, the positive pole POW+ of the brake power supply) of the brake power supply; the other end of the normally open contact of the second relay 140 can be used to connect the other pole (for example, the negative pole POW- of the brake power supply) of the brake power supply. The two ends of the brake coil can be connected in parallel with a freewheeling loop, and the freewheeling loop can include a freewheeling diode and a freewheeling resistor connected in series, for example, one end of the brake coil can be connected to the negative pole of the freewheeling diode, the positive pole of the freewheeling diode can be connected to one end of the freewheeling resistor, and the other end of the freewheeling resistor can be connected to the other end of the brake coil.

[0051] The power supply circuit of the embodiment of the application comprises: a first switching element 110, a first end of the first switching element 110 being used for connecting one end of a brake coil; a control end of the first switching element 110 being used for connecting a loop of a control power supply; a second switching element 120, a first end of the second switching element 120 being used for connecting the other end of the brake coil; a control end of the second switching element 120 being used for connecting the loop of the control power supply; a first relay 130, one end of a normally open contact of the first relay 130 being connected to a second end of the second switching element 120; the other end of the normally open contact of the first relay 130 being used for connecting a brake power supply; a second relay 140, one end of a normally open contact of the second relay 140 being connected to a second end of the first switching element 110; the other end of the normally open contact of the second relay 140 being used for connecting the brake power supply. The power supply circuit of the application can realize that both ends of the brake coil are connected to the brake power supply under the action of a corresponding control circuit, the loop in which the brake coil is located is completely conducted, the brake coil is powered, and then the brake is opened. The power supply circuit of the application can also stop supplying power to the brake coil under the action of a corresponding control circuit to close the brake, without using a contactor or an elevator programmable electronic safety system, with few circuit elements, simple structure, low cost, effectively reducing the noise of the elevator, and improving the safety and stability of operation.

[0052] In one embodiment, as shown in Figure 2 The first relay 130 comprises a first coil 132; the second relay 140 comprises a second coil 142; the power supply circuit further comprises:

[0053] A third relay 210, the third relay 210 comprising a first normally open contact 212 and a second normally open contact 214; the first normally open contact 212 being used for conducting the first coil 132; the second normally open contact 214 being used for conducting the second coil 142.

[0054] Specifically, in the case that the coil of the third relay 210 is powered, for example, the coil of the third relay 210 can be located in a corresponding control circuit, the control circuit can power the coil of the third relay 210, and then the first normally open contact 212 and the second normally open contact 214 of the third relay 210 are both closed. In the case that the first normally open contact 212 is closed, the first coil 132 can be turned on, that is, the first coil 132 of the first relay 130 is powered, and the normally open contact of the first relay 130 is closed; in the case that the second normally open contact 214 is closed, the second coil 142 can be turned on, that is, the second coil 142 of the second relay 140 is powered, and the normally open contact of the second relay 140 is closed. Further, in the case that the loop of the control power supply is turned on, the first switch element 110 and the second switch element 120 can be closed, and then both ends of the brake coil are connected to the brake power supply, the loop in which the brake coil is located is completely turned on, the brake coil is powered, and the brake is opened.

[0055] Further, the loop of the control power supply can be disconnected, the control end of the first switch element 110 and the control end of the second switch element 120 are both powered off, the first switch element 110 and the second switch element 120 are both disconnected, the loop in which the brake coil is located is disconnected, and the power supply circuit cannot power the brake coil; further, the coil of the first relay 130 and the coil of the second relay 140 can be powered off to reset the normally open contact of the first relay 130 and the normally open contact of the second relay 140, so as to maintain the disconnected state of the power supply circuit.

[0056] In some examples, the first relay 130, the second relay 140 and the third relay 210 can all be safety relays, when the normally open contact of the safety relay is closed, the normally closed contact of the safety relay is definitely disconnected; when the normally closed contact of the safety relay is closed, the normally open contact of the safety relay is definitely disconnected.

[0057] In one of the embodiments, as shown in Figure 2 One end of the first coil 132 is connected to the first end of the first switch element 110, and the second end of the first switch element 110 is used to connect the detection power supply; the other end of the first coil 132 is used to connect the detection power supply;

[0058] One end of the second coil 142 is connected to the second end of the second switch element 120, and the first end of the second switch element 120 is used to connect the detection power supply; the other end of the second coil 142 is used to connect the detection power supply.

[0059] Specifically, the second end of the first switch element 110 can be connected to one end of the detection power supply (for example, connected to the positive pole of the first detection power supply), and the other end of the first coil 132 can be connected to the other end of the detection power supply (for example, connected to the negative pole of the first detection power supply). The first end of the second switch element 120 can be connected to one end of the detection power supply (for example, connected to the positive pole of the second detection power supply); the other end of the second coil 142 can be connected to the other end of the detection power supply (for example, connected to the negative pole of the second detection power supply). It should be noted that the first detection power supply and the second detection power supply can be the same detection power supply or different detection power supplies. When the first normally open contact 212 is closed, the first coil 132 can be turned on, and then both ends of the first switch element 110 can be connected to the detection power supply, and the normally open contact of the first relay 130 is closed; when the second normally open contact 214 is closed, the second coil 142 can be turned on, and then both ends of the second switch element 120 can be connected to the detection power supply, and the normally open contact of the second relay 140 is closed. When the normally open contact of the first relay 130 is closed and the normally open contact of the second relay 140 is closed, when the loop of the control power supply is turned on, the first switch element 110 and the second switch element 120 can be closed, and then both ends of the brake coil are connected to the brake power supply, the loop in which the brake coil is located is completely turned on, and the brake coil is powered on, so that the brake is opened.

[0060] Further, by disconnecting the loop of the control power supply, the control end of the first switch element 110 and the control end of the second switch element 120 are both powered off, the first switch element 110 and the second switch element 120 are both disconnected, the loop in which the brake coil is located is disconnected, and the power supply circuit cannot power the brake coil; further, by powering off the coil of the first relay 130 and the coil of the second relay 140, the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are reset to maintain the disconnected state of the power supply circuit.

[0061] In one embodiment, as shown in Figure 2 the first normally open contact 212 is connected in parallel with the first switch element 110; the second normally open contact 214 is connected in parallel with the second switch element 120; one end of the normally closed contact of the third relay 210 is connected to the second end of the second switch element 120; the other end of the normally closed contact of the third relay 210 is connected to one end of the normally open contact of the first relay 130.

[0062] Specifically, in the case that the coil of the third relay 210 is powered, for example, the coil of the third relay 210 can be located in a corresponding control circuit, the control circuit can power the coil of the third relay 210, and then the first normally open contact 212 and the second normally open contact 214 of the third relay 210 are both closed, and the normally closed contact of the third relay 210 is open. The first normally open contact 212 is connected in parallel with the first switching element 110, and in the case that the first normally open contact 212 is closed, the two ends of the first coil 132 are both connected to the detection power supply to turn on the first coil 132, and then the two ends of the first switching element 110 can be connected to the detection power supply, and the normally open contact of the first relay 130 is closed; in the case that the second normally open contact 214 is closed, the two ends of the second coil 142 are both connected to the detection power supply to turn on the second coil 142, and then the two ends of the second switching element 120 can be connected to the detection power supply, and the normally open contact of the second relay 140 is closed. In the case that the first coil 132 and the second coil 142 are both powered, the coil of the third relay 210 can be controlled to be de-energized by a corresponding control circuit, and then the first normally open contact 212 and the second normally open contact 214 of the third relay 210 are both reset, and the normally open contact of the third relay 210 is reset, and the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are both in a closed state. Further, the loop of the control power supply can be turned on to close the first switching element 110 and the second switching element 120, and then the two ends of the brake coil are connected to the brake power supply, the loop in which the brake coil is located is completely turned on, the brake coil is powered, and the brake is opened.

[0063] Further, the loop of the control power supply can be disconnected, the control end of the first switching element 110 and the control end of the second switching element 120 are both de-energized, the first switching element 110 and the second switching element 120 are both open, the loop in which the brake coil is located is disconnected, and the power supply circuit cannot supply power to the brake coil; further, since the first normally open contact 212 and the second normally open contact 214 of the third relay 210 are both reset, the coil of the first relay 130 and the coil of the second relay 140 are both de-energized, and then the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are both reset to maintain the open state of the power supply circuit.

[0064] In one embodiment, as shown in Figure 3 the control end of the first switching element 110 and the first end of the first switching element 110 are both used to connect the control power supply;

[0065] the control end of the second switching element 120 and the second end of the second switching element 120 are both used to connect the control power supply.

[0066] Specifically, both the control terminal and the first terminal of the first switching element 110 can be used to connect to the first control power supply. For example, the control terminal of the first switching element 110 can be connected to the positive terminal of the first control power supply, and the first terminal of the first switching element 110 can be connected to the negative terminal of the first control power supply. Similarly, both the control terminal and the second terminal of the second switching element 120 can be used to connect to the second control power supply. For example, the control terminal of the second switching element 120 can be connected to the positive terminal of the second control power supply, and the second terminal of the second switching element 120 can be connected to the negative terminal of the second control power supply. The first control power supply and the second control power supply can be the same power supply or different power supplies.

[0067] In one embodiment, such as Figure 4 As shown, the first switching element 110 and the second switching element 120 are semiconductor switching elements.

[0068] Specifically, semiconductor switching elements can include at least one of the following: bipolar junction transistors (BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs). The power supply circuit can employ, for example... Figure 4 The circuit shown is implemented as follows. The control terminal of the first switching element 110 can be connected to the SP1 terminal of the first control power supply, and the first end of the first switching element 110 can be connected to the GD1 terminal of the first control power supply; the control terminal of the second switching element 120 can be connected to the SP2 terminal of the second control power supply, and the second end of the second switching element 120 can be connected to the GD2 terminal of the second control power supply. The second end of the first switching element 110 can be connected to the SP1c terminal of the first detection power supply, and the other end of the first coil 132 can be connected to the GD1c terminal of the first detection power supply. The first end of the second switching element 120 can be connected to the SP2c terminal of the second detection power supply; the other end of the second coil 142 can be connected to the GD2c terminal of the second detection power supply.

[0069] In some examples, field-effect transistors may include MOSFET (Metal Oxide Semiconductor Field Effect Transistor), JFET (Junction Field-Effect Transistor), and so on.

[0070] In one embodiment, such as Figure 5 As shown, a control circuit is provided, the control circuit including:

[0071] The first switching power supply 510 has an output end connected to a control power loop.

[0072] The first relay 130 has one end of its normally open contact connected to a safety loop.

[0073] The second relay 140 has one end of its normally open contact connected to the other end of the normally open contact of the first relay 130, and the other end of its normally open contact connected to the input end of the first switching power supply 510.

[0074] Specifically, when the coils of the first relay 130 and the second relay 140 are powered, the normally open contacts of the first relay 130 and the second relay 140 in the control circuit are both closed, and the input end of the first switching power supply 510 is connected to the safety loop. When the safety loop is turned on, the output end of the first switching power supply 510 can be connected to the control power loop to control the first switching element 110 and the second switching element 120 to be closed, and the two ends of the brake coil are connected to the brake power supply, the circuit in which the brake coil is located is completely turned on, the brake coil is powered, and the brake is opened.

[0075] Further, the safety loop can be disconnected, and the output end of the first switching power supply 510 cannot be connected to the control power loop, the control power loop is disconnected, and the control ends of the first switching element 110 and the second switching element 120 are both de-energized to disconnect the first switching element 110 and the second switching element 120, the circuit in which the brake coil is located is disconnected, and the power supply circuit cannot supply power to the brake coil. Further, the coils of the first relay 130 and the second relay 140 in the control circuit can be de-energized to reset the normally open contacts of the first relay 130 and the second relay 140 in the power supply circuit to maintain the disconnection state of the power supply circuit.

[0076] In some examples, the safety loop can also be connected to a safety loop power supply. It should be noted that the safety loop can be a circuit for controlling the working state of the brake of the elevator to ensure the safety of the elevator. The first switching power supply 510 can include a DC / DC switching power supply (direct current to direct current switching power supply), for example, an isolation transformer.

[0077] The control circuit of the embodiment of the application comprises: a first switching power supply 510, an output end of the first switching power supply 510 being used for connecting a loop of a control power supply; a first relay 130, one end of a normally open contact of the first relay 130 being used for connecting a safety loop; a second relay 140, one end of a normally open contact of the second relay 140 being connected to the other end of the normally open contact of the first relay 130; and the other end of the normally open contact of the second relay 140 being connected to an input end of the first switching power supply 510. Through the control circuit, the power supply circuit can be controlled when the safety circuit is connected, so that the brake coil is powered on, and when the safety circuit is not connected, the brake coil is powered off. Neither contactor nor programmable electronic safety system of the elevator is used, the circuit elements are few, the structure is simple, the cost is low, the elevator noise is effectively reduced, and the safety and stability of operation are improved.

[0078] In one embodiment, as shown in Figure 6 the control circuit further comprises:

[0079] The third relay 210 comprises a third coil 216; one end of the third coil 216 is used for connecting a power supply of a safety loop; the other end of the third coil 216 is used for connecting the safety loop through the normally closed contact of the second relay 140 and the normally closed contact of the first relay 130 in sequence; one end of a normally closed contact of the third relay 210 is connected to the other end of the normally open contact of the second relay 140, and the other end of the normally closed contact of the third relay 210 is connected to the input end of the first switching power supply 510.

[0080] Specifically, the normally closed contact of the third relay 210 in the power supply circuit can be a first normally closed contact, and the normally closed contact of the third relay 210 in the control circuit can be a second normally closed contact. It should be noted that the first normally closed contact and the second normally closed contact can be the same normally closed contact, or can be different normally closed contacts. In the case where the coil (for example, the first coil 132) of the first relay 130 and the coil (for example, the second coil 142) of the second relay 140 are not powered, the normally closed contact of the second relay 140 and the normally closed contact of the first relay 130 both remain in a closed state, the third coil 216 of the third relay 210 is powered, and then the first normally open contact 212 and the second normally open contact 214 of the third relay 210 in the power supply circuit are both closed, and the normally closed contact of the third relay 210 is open. The first normally open contact 212 is connected in parallel with the first switching element 110. In the case where the first normally open contact 212 is closed, the two ends of the first coil 132 are both connected to the detection power supply to turn on the first coil 132, and then in the power supply circuit, the two ends of the first switching element 110 can be connected to the detection power supply, and the normally open contact of the first relay 130 is closed. In the case where the second normally open contact 214 is closed, the two ends of the second coil 142 are both connected to the detection power supply to turn on the second coil 142, and then in the power supply circuit, the two ends of the second switching element 120 can be connected to the detection power supply, and the normally open contact of the second relay 140 is closed. In the case where the coil of the first relay 130 and the coil of the second relay 140 are powered, in the control circuit, the normally open contact of the first relay 130 and the normally open contact of the second relay 140 are both closed, the normally closed contact of the second relay 140 and the normally closed contact of the first relay 130 are both open, and then the input end of the first switching power supply 510 is connected to the safety loop, and the third coil 216 of the third relay 210 loses power; further, in the power supply circuit, the first normally open contact 212 and the second normally open contact 214 of the third relay 210 and the normally closed contact of the third relay 210 are all reset, and the normally open contact of the first relay 130 and the normally open contact of the second relay 140 both remain in a closed state. In the case where the safety loop is turned on, the output end of the first switching power supply 510 can connect the loop of the control power supply to control the first switching element 110 and the second switching element 120 to be closed, so that the two ends of the brake coil are both connected to the brake power supply, the loop in which the brake coil is located is completely turned on, the brake coil is powered, and the brake is opened.

[0081] In one embodiment, as shown in FIG. 1, Figure 6 the control circuit further comprises:

[0082] a second switching power supply 610, an input end of the second switching power supply 610 being used for connecting the power supply of the safety loop, and an output end of the second switching power supply 610 being used for connecting the detection power supply.

[0083] Specifically, the input end of the second switching power supply 610 is connected to the power supply of the safety circuit, so that the output end of the second switching power supply 610 is connected to the circuit of the detection power supply, for example, the circuit of the first detection power supply and the circuit of the second detection power supply.

[0084] In some examples, the second switching power supply 610 can include a DC / DC switching power supply, for example, an isolation transformer.

[0085] In one embodiment, an elevator is provided, which includes a safety circuit, a control power supply and a brake; the brake includes a brake coil and a brake power supply; the elevator further includes:

[0086] A first switching element 110, one end of the first switching element 110 is connected to one end of the brake coil; the control end of the first switching element 110 is connected to the circuit of the control power supply;

[0087] A second switching element 120, one end of the second switching element 120 is connected to the other end of the brake coil; the control end of the second switching element 120 is connected to the circuit of the control power supply;

[0088] A first switching power supply 510, the output end of the first switching power supply 510 is connected to the circuit of the control power supply;

[0089] A first relay 130, the first relay 130 includes a third normally open contact and a fourth normally open contact; one end of the third normally open contact is connected to the second end of the second switching element 120; the other end of the third normally open contact is connected to the brake power supply; one end of the fourth normally open contact is connected to the safety circuit;

[0090] A second relay 140, the second relay 140 includes a fifth normally open contact and a sixth normally open contact; one end of the fifth normally open contact is connected to the second end of the first switching element 110; the other end of the fifth normally open contact is connected to the brake power supply; one end of the sixth normally open contact is connected to the other end of the fourth normally open contact; the other end of the sixth normally open contact is connected to the input end of the first switching power supply 510.

[0091] Specifically, please refer to Figure 7When the coils of the first relay 130 and the second relay 140 are energized, the third and fifth normally open contacts, as well as the fourth and sixth normally open contacts, are closed. Furthermore, the input terminal of the first switching power supply 510 is connected to a safety circuit. When the safety circuit is active, the output terminal of the first switching power supply 510 can connect to the control power supply circuit. The first switching element 110 and the second switching element 120 can be used to control current flow and switch between states. Further, when the control power supply circuit is active, the first switching element 110 and the second switching element 120 can be controlled to close, thus connecting both ends of the brake coil to the brake power supply. The circuit containing the brake coil is fully active, energizing the brake coil and causing the brake to open.

[0092] Furthermore, by disconnecting the control power supply circuit, the output terminal of the first switching power supply 510 cannot connect to the control power supply circuit, the control power supply circuit is disconnected, the control terminals of the first switching element 110 and the second switching element 120 are both de-energized, the first switching element 110 and the second switching element 120 are both disconnected, the circuit where the brake coil is located is disconnected, and the power supply circuit cannot supply power to the brake coil; furthermore, by controlling the coils of the first relay 130 and the second relay 140 to de-energize, the third normally open contact and the fifth normally open contact are both reset to maintain the disconnected state of the power supply circuit.

[0093] In some examples, the brake coil can be an electromagnetic brake coil. Examples include... Figure 8 The circuit shown is used to energize and de-energize the coils of the first relay 130 and the second relay 140. Further, the following fault conditions can be identified: For a short-circuit fault in the first switching element 110, before the brake opens, the coil of the first relay 130 is energized, causing its normally open contact to close and its normally closed contact to open. The coil of the third relay 210 cannot be energized, and its normally open contact cannot connect, thus preventing the coil of the second relay 140 from being energized. The normally open contact of the second relay 140 cannot close, the first switching power supply 510 is de-energized, the control power supply remains without output, the control terminal of the second switching element 120 has no driving voltage and remains off, the power supply circuit for the brake coil cannot be connected, and the brake cannot open. For an open-circuit fault in the first switching element 110, during the brake opening process, the coil of the first relay 130 cannot maintain power supply, the power supply circuit for the brake coil cannot be connected, and the brake cannot open.

[0094] For the short circuit fault of the second switch element 120, before the brake is opened, the coil of the second relay 140 is energized, so that the normally open contact of the second relay 140 is closed, the normally closed contact of the second relay 140 is opened, the coil of the third relay 210 cannot be energized, the normally open contact of the third relay 210 cannot be turned on, so that the first relay 130 cannot be energized, the normally open contact of the first relay 130 cannot be closed, the first switch power supply 510 cannot be energized, the control power supply remains no output, the control end of the second switch element 120 has no driving voltage, the second switch element 120 remains off, and the power supply loop of the brake coil cannot be turned on, so that the brake cannot be opened. For the open circuit fault of the second switch element 120, during the opening of the brake, the coil of the second relay 140 cannot be energized, the power supply loop of the brake coil cannot be turned on, and the brake cannot be opened.

[0095] For the short circuit fault of the normally open contact of the first relay 130 (the same as the normally open contact of the second relay 140) (equivalent to the open circuit fault of the normally closed contact of the first relay 130), the normally closed contact of the first relay 130 is open, the coil of the third relay 210 cannot be energized at all, the normally open contact of the third relay 210 cannot be closed, the coil of the second relay 140 cannot be energized, the normally open contact of the second relay 140 cannot be closed, the first switch power supply 510 cannot be energized, the control power supply remains no output, the control end of the second switch element 120 has no driving voltage, the second switch element 120 remains off, the power supply loop of the brake coil cannot be turned on, and the brake cannot be opened. For the open circuit fault of the normally open contact of the first relay 130 (the same as the normally open contact of the second relay 140) (equivalent to the short circuit fault of the normally closed contact of the first relay 130), the first switch power supply 510 cannot be energized, the control power supply remains no output, the control end of the second switch element 120 has no driving voltage, the second switch element 120 remains off, the power supply loop of the brake coil cannot be turned on, and the brake cannot be opened.

[0096] For the short circuit fault of the normally open contact of the third relay 210 (equivalent to the open circuit fault of the normally closed contact of the third relay 210), that is, the normally closed contact of the third relay 210 is open, the power supply circuit of the brake coil cannot be turned on, and the brake cannot be opened. For the open circuit fault of the normally open contact of the third relay 210 (equivalent to the short circuit fault of the normally closed contact of the third relay 210), before the brake is opened, the coil of the first relay 130 and the coil of the second relay 140 cannot be powered, the normally open contact of the first relay 130 and the normally open contact of the second relay 140 cannot be closed, the first switching power supply 510 cannot be powered, the control power supply remains no output, the control end of the first switching element 110 and the second switching element 120 has no driving voltage, the first switching element 110 and the second switching element 120 remain off, the power supply circuit of the brake coil cannot be turned on, and the brake cannot be opened.

[0097] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0098] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A power supply circuit for a brake of an elevator, characterized by, The power supply circuit comprises: a first switch element, a first end of the first switch element being used for connecting one end of a brake coil; a control end of the first switch element being used for connecting a loop of a control power supply; a second switch element, a first end of the second switch element being used for connecting the other end of the brake coil; a control end of the second switch element being used for connecting the loop of the control power supply; a first relay, one end of a normally open contact of the first relay being connected to a second end of the second switch element; the other end of the normally open contact of the first relay being used for connecting a brake power supply; the first relay comprising a first coil; one end of the first coil being connected to a first end of the first switch element, a second end of the first switch element being used for connecting a detection power supply; the other end of the first coil being used for connecting the detection power supply; a second relay, one end of a normally open contact of the second relay being connected to a second end of the first switch element; the other end of the normally open contact of the second relay being used for connecting the brake power supply; the second relay comprising a second coil; one end of the second coil being connected to a second end of the second switch element, a first end of the second switch element being used for connecting the detection power supply; the other end of the second coil being used for connecting the detection power supply; a third relay, the third relay comprising a first normally open contact and a second normally open contact; the first normally open contact being used for conducting the first coil; the second normally open contact being used for conducting the second coil; the first normally open contact being connected in parallel with the first switch element; the second normally open contact being connected in parallel with the second switch element; one end of a normally closed contact of the third relay being connected to a second end of the second switch element; the other end of the normally closed contact of the third relay being connected to one end of the normally open contact of the first relay.

2. The power supply circuit for the brake of an elevator according to claim 1, characterized in that, The control end of the first switch element and the first end of the first switch element are both used for connecting the control power supply; The control end of the second switch element and the second end of the second switch element are both used for connecting the control power supply.

3. The power supply circuit of the brake of an elevator according to any one of claims 1 to 2, characterized in that, The first switch element and the second switch element are semiconductor switch elements.

4. An elevator, characterized in that The power supply circuit of the brake of the elevator as claimed in any one of claims 1 to 3 further comprises a control circuit, the control circuit comprising: a first switch power supply, an output end of the first switch power supply being used for connecting a loop of a control power supply; a first relay, one end of a normally open contact of the first relay being used for connecting a safety loop; a second relay, one end of a normally open contact of the second relay being connected to the other end of the normally open contact of the first relay; the other end of the normally open contact of the second relay being connected to an input end of the first switch power supply.

5. The elevator of claim 4, wherein, The control circuit further comprises: A third relay, the third relay comprising a third coil; one end of the third coil being used for connecting a power source of the safety circuit; the other end of the third coil being used for accessing the safety circuit through the normally closed contact of the second relay and the normally closed contact of the first relay in sequence; one end of the normally closed contact of the third relay being connected to the other end of the normally open contact of the second relay, and the other end of the normally closed contact of the third relay being connected to the input end of the first switching power source.

6. The elevator of claim 5, wherein, The control circuit further comprises: A second switching power source, the input end of the second switching power source being used for connecting the power source of the safety circuit; the output end of the second switching power source being used for connecting a detection power source.

7. An elevator, characterized by The elevator comprises the power supply circuit, the safety circuit, the control power source and the brake of the elevator according to any one of claims 1 to 3; The brake comprises a brake coil and a brake power source; the elevator further comprises: A first switching element, one end of the first switching element being connected to one end of the brake coil; the control end of the first switching element being connected to the circuit of the control power source; A second switching element, one end of the second switching element being connected to the other end of the brake coil; the control end of the second switching element being connected to the circuit of the control power source; A first switching power source, the output end of the first switching power source being connected to the circuit of the control power source; A first relay, the first relay comprising a third normally open contact and a fourth normally open contact; one end of the third normally open contact being connected to the second end of the second switching element; the other end of the third normally open contact being connected to the brake power source; one end of the fourth normally open contact being connected to the safety circuit; A second relay, the second relay comprising a fifth normally open contact and a sixth normally open contact; one end of the fifth normally open contact being connected to the second end of the first switching element; the other end of the fifth normally open contact being connected to the brake power source; one end of the sixth normally open contact being connected to the other end of the fourth normally open contact; the other end of the sixth normally open contact being connected to the input end of the first switching power source.

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