Self-locking and unlocking circuit based on pulse control and circuit control method

Abstract

The invention discloses a self-locking and unlocking circuit based on pulse control and a circuit control method, and the method comprises the steps: a first connector, the output end of which is connected to an external solid-state relay; the input ends of the third connector and the fourth connector are connected to an external main control board; the input end of the first connector is electrically connected with a first relay, a coil of the first relay is electrically connected with a second relay, a coil of the second relay is electrically connected with a third relay, and a coil of the third relay is electrically connected to the output end of the third connector. A coil of the first relay is connected to the output end of the fourth connector. Through the arrangement of the connector and the plurality of relays, pulse signals are output to control the actions of the relays, multi-stage linkage control is realized, meanwhile, self-locking and unlocking of the circuit are realized, the relay circuit can be conveniently integrated into an application system through the connector, and the adaptability and expansibility of the circuit are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse-controlled circuits, and in particular to a pulse-controlled self-locking and unlocking circuit and a circuit control method. Background Art

[0002] The self-locking and unlocking of the circuit are widely used in various equipment control fields. It can realize that when the circuit enters a certain state, the relay self-locking can maintain the state, and the circuit still maintains the action even if the control signal disappears. This is particularly important for the continuous control of critical loads, such as maintaining the continuous power supply of power or critical equipment. At the same time, the self-locking function can prevent the circuit from accidentally changing the state due to momentary signal fluctuations or short-term signal loss, thereby improving the reliability of the circuit. When switching or resetting is required, the circuit can be released from the self-locking state and restored to the initial state by unlocking, ensuring that the circuit can receive the control signal again. The unlocking function can cut off the circuit in an emergency to ensure that the equipment can be powered off or shut down when not needed, increasing the safety of the circuit. For example, stop the power supply of key equipment to avoid power overload or safety hazards. The traditional way to implement the self-locking and unlocking circuit is to lock the output through a complex electronic circuit or the IO port of the microcontroller continuously outputs high and low levels. Thereby achieving the purpose of self-locking and unlocking. The disadvantage of this technology is that it requires a microcontroller, requires writing programs and communication cables. Adding power conversion to power the microcontroller makes the circuit complex and troublesome. Summary of the invention

[0003] In view of this, the present invention proposes a self-locking and unlocking circuit based on pulse control and a circuit control method, which can realize the pulse control of the self-locking and unlocking circuit through a simple circuit design. The present invention provides the following technical solutions: A self-locking and unlocking circuit based on pulse control comprises: a first connector, whose output end is connected to an external solid-state relay; a third connector and a fourth connector, whose input ends are connected to an external main control board; the input end of the first connector is electrically connected to a first relay, the coil of the first relay is electrically connected to a second relay, the coil of the second relay is electrically connected to a third relay, the coil of the third relay is electrically connected to the output end of the third connector, and the coil of the first relay is connected to the output end of the fourth connector.

[0004] Optionally, the first relay, the second relay and the third relay are single-pole double-throw relays.

[0005] Optionally, one end of the first connector is connected to the normally open contact of the first relay, and the other end is connected to GND.

[0006] Optionally, one end of the coil of the first relay is connected to the normally closed contact of the second relay, the normally closed contact of the second relay is connected to the normally open contact of the first relay, one end of the coil of the second relay is connected to one end of the fourth connector, and the other end of the coil of the second relay is connected to the normally closed contact of the third relay.

[0007] Optionally, one end of the coil of the third relay is connected to one end of the third connector, and the other end of the coil of the third relay is connected to GND.

[0008] Optionally, a fourth relay is further included, and another normally closed contact of the third relay is electrically connected to one end of the coil of the fourth relay, and the other end of the coil is electrically connected to a fifth connector.

[0009] Optionally, a fifth relay is further included, and the normally closed contact of the fourth relay is connected to the coil and the normally open contact of the fifth relay.

[0010] Optionally, another normally open contact of the fifth relay is electrically connected to a second connector.

[0011] Optionally, the pulse signal width is greater than the start-up time of the first relay, the second relay, the third relay, the fourth relay and the fifth relay.

[0012] The present invention further discloses a control method for a self-locking and unlocking circuit based on pulse control, which is applied to the above-mentioned self-locking and unlocking circuit, and sets the third connector to a low-level output, sets the fourth connector to a high-level output, and the first relay is energized, thereby controlling the first connector to output a high level, thereby controlling the external solid-state relay to be turned on, and the first relay is self-retained; the fourth connector is set to a low level, and the first relay continues to be self-retained, so as to achieve that when the external main control board loses power or restarts, the external solid-state relay is kept turned on; the fourth connector is set to a high level, and the third connector is set to a high level, and the coil of the third relay is turned on, thereby controlling the coil of the second relay to be self-retained and disconnected, the first relay loses power, and the first connector outputs a low level, thereby controlling the external solid-state relay to be disconnected.

[0013] By setting up a connector and multiple relays, it is possible to output a pulse signal to control the action of the relay, and multiple relay control connections can achieve multi-level linkage control, meet the needs of complex circuit logic control, and realize self-locking and unlocking of the circuit. The connector can easily integrate the relay circuit into the application system, enhancing the adaptability and expansibility of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] For the purpose of illustration and not limitation, the present invention is now described in conjunction with the embodiments of the present invention and the accompanying drawings, in which: Figure 1 It is a schematic diagram of a self-locking and unlocking circuit based on pulse control in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the implementation of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation of the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementations. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first", "second", etc. in the specification of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0017] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0018] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to the specific circumstances. In addition, the term "plurality" should mean two or more than two.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] The present embodiment discloses a self-locking and unlocking circuit based on pulse control, including at least three connectors and at least three relays, including a first connector, whose output end is connected to an external solid-state relay, so that when a high level is input to the first connector, a 24V control signal is output to the solid-state relay, and further control the connection or disconnection of a 220V power supply; and also includes a third connector and a fourth connector, and the input ends of the third connector and the fourth connector are connected to an external main control board, so that when a high level is input, a 24V control signal is output to the main control board.

[0021] The input end of the first connector is electrically connected to a first relay, the coil of the first relay is electrically connected to a second relay, the coil of the second relay is electrically connected to a third relay, the coil of the third relay is electrically connected to the output end of the third connector, and the coil of the first relay is connected to the output end of the fourth connector. In this embodiment, all relays are single-pole double-throw relays.

[0022] In this embodiment, taking the application of CT equipment as an example, the self-locking and unlocking circuit also includes a second connector, a fifth relay, a fourth relay and a fifth connector. The output end of the second connector is connected to another external solid-state relay to output a 24V control signal to the solid-state relay when a high level is input to the second connector, thereby further controlling the connection or disconnection of the 220V power supply; the input end of the fifth connector is connected to an external main control board to output a 24V control signal to the main control board when a high level is input.

[0023] refer to Figure 1, the 2nd contact of the first connector CN4 is connected to GND, and the 1st contact is connected to the normally closed contact 9 of the first relay RLY4. The 2nd contact of the fourth connector CN3 is connected to the coil of the second relay RLY3 through the diode D4, the other end of the coil of the second relay RLY3 is connected to the normally closed contact 11 of the third relay RLY5, the normally open contacts 8 and 9 of the third relay RLY5 are connected to GND, the normally closed contact 6 of the third relay RLY5 is connected to the coil of the fourth relay RLY1, and the 2nd contact of the fifth connector CN1 is connected to the other end of the coil of the fourth relay RLY1 through the diode D3. The normally closed contact 6 of the fourth relay RLY1 is connected to the coil of the fifth relay RLY2, the normally open contact 8 of the fifth relay RLY2 is open-closed connected to the normally closed contact 6 of the fourth relay RLY1, and the normally open contact 9 of the fifth relay RLY2 is connected to the 1st contact of the second connector CN2. The normally open contact 8 of the first relay RLY4 is connected to the normally closed contact 6 of the second relay RLY3 for opening and closing connection, and the normally closed contact 6 of the second relay RLY3 is connected to the coil of the first relay RLY4, and the other end of the coil is connected to GND. The 2 contacts of the fourth connector CN3 are also connected to the normally closed contact 11 of the second relay RLY3 through the diode D4. The 2 contacts of the third connector CN5 are connected to the coil of the third relay RLY5, and the other end of the coil is connected to GND. The normally closed contact 6 of the fourth relay RLY1 is connected to the coil of the fifth relay RLY2, and the other end of the coil is connected to GND.

[0024] Through the above self-locking and unlocking circuit, it can be achieved: When the fifth connector CN1 obtains a pulse signal, it should be understood that the pulse signal width in this embodiment is greater than the start-up time of the relay, the third connector CN5 and the fourth connector CN3 maintain a low level, and the 1st contact of the second connector CN2 outputs a high level; When the fourth connector CN3 obtains a pulse signal, the third connector CN5 and the fifth connector CN1 maintain a low level, and the first contact of the first connector CN4 outputs a high level; When the fifth connector CN1 and the third connector CN5 simultaneously obtain pulse signals, the contact 1 of the second connector CN2 outputs a low level; When the fifth connector CN1, the third connector CN5 and the fourth connector CN3 are all at low levels, the circuit is self-locking and maintains the previous state; When the fifth connector CN1, the third connector CN5 and the fourth connector CN3 are all at high level, the first connector CN4 and the 1 contact of the first connector CN4 output low level; When the fifth connector CN1 is at a low level, the third connector CN5 obtains a pulse signal, and the fourth connector CN3 is at a low level, the circuit is self-locking and maintains the previous state; When the fifth connector CN1 and the fourth connector CN3 simultaneously obtain the pulse signal and the third connector CN5 is at a low level, the first connector CN4 and the second connector CN2 output a high level at the first contact.

[0025] The truth table corresponding to the above function implementation is as follows: Table 1 Truth table

[0026] This embodiment further discloses a control method of a self-locking and unlocking circuit based on pulse control, which specifically includes: Set the second connector A to low level output, set the second connector B to high level output, relay A is energized, thereby controlling the first connector A to output high level, thereby controlling the external solid-state relay to conduct, and relay A is self-holding; The second connector B is set to a low level, and the relay A continues to be self-holding, so as to keep the external solid-state relay turned on when the external main control board loses power or restarts.

[0027] Set the second connector B to a high level, set the second connector A to a high level, the coil of relay C is turned on, thereby controlling the coil of relay B to self-hold disconnection, relay A loses power, and the first connector A outputs a low level, thereby controlling the external solid-state relay to disconnect.

[0028] For example, when in use, taking the CT equipment main control board controlling the power on and off of the high voltage system and simulating the action of the CT equipment high voltage system when the main control board is powered off or restarted as an example, this embodiment shows a situation processing flow: When contact 2 of the third connector CN5 is at a low level, contact 2 of the fifth connector CN1 is set to a high level. At this time, the coil of the fourth relay RLY1 cannot be connected to GND because the normally open contacts 6 and 8 of the third relay RLY5 are not closed, so the fourth relay RLY1 does not operate, and the coil of the fifth relay RLY2 is energized through the normally closed contacts 4 and 6 of the fourth relay RLY1. At this time, the normally closed contacts 9 and 11 of the fifth relay RLY2 are connected to VCC_24V, and contact 1 of the second connector CN2 is energized, thereby controlling the external solid-state relay to turn on the high-voltage 220V power supply, and the fifth relay RLY2 is self-holding through the normally open contacts 6 and 8.

[0029] Further, when the 2nd contact of the third connector CN5 is at a low level, the 2nd contact of the fourth connector CN3 is set to a high level. Since the normally open contacts 9 and 11 of the third relay RLY5 are not closed, the coil of the second relay RLY3 cannot be connected to GND, so the second relay RLY3 does not operate, and the coil of the first relay RLY4 is energized through the normally closed contacts 4 and 6 of the second relay RLY3. At this time, the normally open contacts 11 and 9 of the first relay RLY4 are connected to VCC_24V, and the 1st contact of the first connector CN4 is energized, thereby controlling the external solid-state relay to turn on the high-voltage 220V power supply, and the first relay RLY4 is self-holding through the normally open contacts 6 and 8.

[0030] After the above two operations, when the 2 contacts of the fifth connector CN1 or the 2 contacts of the fourth connector CN3 lose power, the fifth relay RLY2 and the first relay RLY4 are still in the self-holding state, so that the 220V power supply and 24V control power supply can be maintained when the main control board of the CT equipment loses power or restarts.

[0031] Further, contact 2 of the fifth connector CN1 is set to a high level, and then contact 2 of the third connector CN5 is set to a high level, the normally open contacts 6 and 8 of the third relay RLY5 connect the coil of the fourth relay RLY1, and at the same time, its normally closed contacts 4 and 6 are opened, and the self-holding circuit of the coil of the fourth relay RLY1 is disconnected, the normally open contacts 11 and 9 of the fifth relay RLY2 are opened, and contact 1 of the second connector CN2 loses power, thereby controlling the external solid-state relay to open and shut down the high-voltage 220V power supply.

[0032] Further, contact 2 of the fourth connector CN3 is set to a high level, and then contact 2 of the third connector CN5 is set to a high level, the normally open contacts 9 and 11 of the third relay RLY5 connect the coil of the second relay RLY3, and at the same time, its normally closed contacts 4 and 6 are opened, and the self-holding circuit of the coil of the second relay RLY3 is disconnected, the normally open contacts 11 and 9 of the first relay RLY4 are opened, and contact 1 of the first connector CN4 loses power, thereby controlling the external solid-state relay to open and shut down the high-voltage 220V power supply.

[0033] In summary, the self-locking and unlocking circuit technology disclosed in this embodiment can control the high-voltage system to start and stop in sequence through the main control board, and can also maintain the 220V power supply of the high-voltage system when the main control board is powered off or restarted.

[0034] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-locking and unlocking circuit based on pulse control, characterized in that: include: a first connector having an output end connected to an external solid-state relay; a third connector and a fourth connector, wherein input ends of the third connector and the fourth connector are connected to an external main control board; The input end of the first connector is electrically connected to a first relay, the coil of the first relay is electrically connected to a second relay, the coil of the second relay is electrically connected to a third relay, the coil of the third relay is electrically connected to the output end of the third connector, and the coil of the first relay is connected to the output end of the fourth connector.

2. The self-locking and unlocking circuit based on pulse control according to claim 1, characterized in that: The first relay, the second relay and the third relay are single-pole double-throw relays.

3. The self-locking and unlocking circuit based on pulse control according to claim 1, characterized in that: One end of the first connector is connected to the normally open contact of the first relay, and the other end is connected to GND.

4. The self-locking and unlocking circuit based on pulse control as claimed in claim 3, characterized in that: One end of the coil of the first relay is connected to the normally closed contact of the second relay, the normally closed contact of the second relay is connected to the normally open contact of the first relay, one end of the coil of the second relay is connected to one end of the fourth connector, and the other end of the coil of the second relay is connected to the normally closed contact of the third relay.

5. The self-locking and unlocking circuit based on pulse control as claimed in claim 4, characterized in that: One end of the coil of the third relay is connected to one end of the third connector, and the other end of the coil of the third relay is connected to GND.

6. The self-locking and unlocking circuit based on pulse control as claimed in claim 4, characterized in that: A fourth relay is also included, wherein another normally closed contact of the third relay is electrically connected to one end of a coil of the fourth relay, and the other end of the coil is electrically connected to a fifth connector.

7. The self-locking and unlocking circuit based on pulse control as claimed in claim 6, characterized in that: A fifth relay is also included, wherein the normally closed contact of the fourth relay is connected to the coil and the normally open contact of the fifth relay.

8. The self-locking and unlocking circuit based on pulse control according to claim 7, characterized in that: Another normally open contact of the fifth relay is electrically connected to the second connector.

9. The self-locking and unlocking circuit based on pulse control according to claim 7, characterized in that: The pulse signal width is greater than the start-up time of the first relay, the second relay, the third relay, the fourth relay and the fifth relay.

10. A control method for a self-locking and unlocking circuit based on pulse control, applied to the self-locking and unlocking circuit according to any one of claims 1 to 9, characterized in that: The third connector is set to a low level output, and the fourth connector is set to a high level output, the first relay is energized, thereby controlling the first connector to output a high level, thereby controlling the external solid-state relay to be turned on, and the first relay is self-holding; The fourth connector is set to a low level, and the first relay continues to be self-holding, so as to keep the external solid-state relay turned on when the external main control board loses power or restarts; The fourth connector is set to a high level, the third connector is set to a high level, the coil of the third relay is turned on, thereby controlling the coil of the second relay to be disconnected, the first relay loses power, and the first connector outputs a low level, thereby controlling the external solid-state relay to be disconnected.

Images