阅读说明：本技术 一种cb级自动转换开关的脱扣检测电路及方法 (Tripping detection circuit and method for CB-level automatic transfer switch ) 是由 李超 李松泽 刘琦 张雨龙 薄同伟 于 2020-12-25 设计创作，主要内容包括：本发明提供了一种CB级自动转换开关的脱扣检测电路及方法,包括：微控制器,第一三极管、第二三极管、第一电源反馈点、第二电源反馈点、第一继电器；第一电源反馈点的一端与外接电源相连,第一电源反馈点的另一端与第二电源反馈点的一端相连,第二电源反馈点的另一端与第三三极管发射极相连,第三三极管基极与微控制器相连,第三三极管集电极与第一继电器相连；第一三极管集电极与外接电源相连,第一三极管基极与第一电源反馈点的另一端相连,第二三极管集电极与外接电源相连,第二三极管基极与第一电源反馈点的另一端相连,第一三极管以及第二三极管均与微电机相连。通过本发明可以缓解现有技术中读取脱扣反馈状态的抢点信号困难的技术问题。(The invention provides a tripping detection circuit and a method of a CB-level automatic transfer switch, which comprises the following steps: the microcontroller is used for controlling the power supply of the power supply to work; one end of the first power supply feedback point is connected with an external power supply, the other end of the first power supply feedback point is connected with one end of the second power supply feedback point, the other end of the second power supply feedback point is connected with an emitting electrode of a third triode, a base electrode of the third triode is connected with the microcontroller, and a collector electrode of the third triode is connected with the first relay; the collector of the first triode is connected with an external power supply, the base of the first triode is connected with the other end of the first power supply feedback point, the collector of the second triode is connected with the external power supply, the base of the second triode is connected with the other end of the first power supply feedback point, and the first triode and the second triode are both connected with the micromotor. The technical problem that the point grabbing signal in the tripping feedback state is difficult to read in the prior art can be solved through the method and the device.)

1. A trip detection circuit of a CB level automatic transfer switch is characterized by comprising:

the microcontroller is used for controlling the power supply of the power supply to work;

one end of the first power supply feedback point is connected with an external power supply, the other end of the first power supply feedback point is connected with one end of the second power supply feedback point, the other end of the second power supply feedback point is connected with an emitting electrode of the third triode, a base electrode of the third triode is connected with the microcontroller, and a collector electrode of the third triode is connected with the first relay;

the collector of the first triode is connected with an external power supply, the base of the first triode is connected with the other end of the first power supply feedback point, and the emitter of the first triode is grounded;

the collector of the second triode is connected with an external power supply, the base of the second triode is connected with the other end of the first power supply feedback point, and the emitter of the second triode is grounded;

the first triode and the second triode are both connected with the micromotor.

2. The trip detection circuit of a class CB automatic transfer switch of claim 1 further comprising a fourth transistor and a second relay;

and the collector of the fourth triode is connected with the other end of the second power supply feedback point, and the fourth triode is connected with the second relay.

3. A trip detection method of a CB-level automatic transfer switch adopting a trip detection circuit of the CB-level automatic transfer switch is characterized in that,

the method comprises the following steps of obtaining the opening and closing state of a first power supply feedback point and the opening and closing state of a second power supply feedback point, and obtaining the opening and closing state of the first power supply feedback point and the opening and closing state of the second power supply feedback point by a microcontroller and judging:

if the first power supply feedback point and the second power supply feedback point are closed, the microcontroller judges that the power supply is not tripped;

if the first power supply feedback point is closed and the second power supply feedback point is opened, the microcontroller judges that the second power supply is tripped;

and if the first power supply feedback point is disconnected, a pin connected with the first triode in the microcontroller acquires a high level, and a pin connected with the second triode in the microcontroller acquires a high level, the microcontroller judges that the first power supply is tripped.

Technical Field

The invention relates to the technical field of tripping detection, in particular to a tripping detection circuit and a method of a CB-level automatic change-over switch.

Background

In the prior art, two circuit breaker tripping feedback contacts in the CB-level automatic transfer switch are often connected in series to a motor power supply loop, when a certain circuit breaker of the automatic transfer switch is tripped, a motor power supply cannot supply power, the motor power supply is electrically disconnected, the automatic transfer switch is forbidden to switch when the circuit breaker is tripped, and safety is guaranteed.

The trip feedback contact is connected in series in the motor power supply loop (the voltage of the motor power supply loop is AC220V or AC380V), the trip feedback contact is connected in series in the motor strong current loop and then feeds back a strong current signal, the controller of the automatic change-over switch is a weak current signal, and the controller is difficult to read the strong current signal of the trip feedback state (more complex realization is needed and the cost is increased). However, the existing controller needs to read the trip state and perform audible and visual alarm, so that each circuit breaker needs a plurality of trip feedback contacts, one trip feedback contact is connected in series to the motor loop, and the other trip feedback contact is provided for the controller. This increases the cost on the one hand and on the other hand it is possible that some circuit breakers do not support more than 2 trip feedback contacts.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a trip detection circuit and method for a CB-level automatic transfer switch, so as to alleviate the technical problem in the prior art that it is difficult to read the robbing point signal of the trip feedback state, and at the same time, the trip detection can be still implemented under the condition that the circuit breaker does not support multiple feedback nodes, thereby reducing the cost.

In a first aspect, an embodiment of the present invention provides a trip detection circuit for a CB-level automatic transfer switch, including:

the microcontroller is used for controlling the power supply of the power supply to work;

one end of the first power supply feedback point is connected with an external power supply, the other end of the first power supply feedback point is connected with one end of the second power supply feedback point, the other end of the second power supply feedback point is connected with an emitting electrode of the third triode, a base electrode of the third triode is connected with the microcontroller, and a collector electrode of the third triode is connected with the first relay;

the collector of the first triode is connected with an external power supply, the base of the first triode is connected with the other end of the first power supply feedback point, and the emitter of the first triode is grounded;

the collector of the second triode is connected with an external power supply, the base of the second triode is connected with the other end of the first power supply feedback point, and the emitter of the second triode is grounded;

the first triode and the second triode are both connected with the micromotor.

Preferably, the power supply further comprises a fourth triode and a second relay;

and the collector of the fourth triode is connected with the other end of the second power supply feedback point, and the fourth triode is connected with the second relay.

Preferably, the invention provides a trip detection method of a CB level automatic transfer switch,

the method comprises the following steps of obtaining the opening and closing state of a first power supply feedback point and the opening and closing state of a second power supply feedback point, and obtaining the opening and closing state of the first power supply feedback point and the opening and closing state of the second power supply feedback point by a microcontroller and judging:

the method comprises the following steps of obtaining the opening and closing state of a first power supply feedback point and the opening and closing state of a second power supply feedback point, and obtaining the opening and closing state of the first power supply feedback point and the opening and closing state of the second power supply feedback point by a microcontroller and judging:

if the first power supply feedback point and the second power supply feedback point are closed, the microcontroller judges that the power supply is not tripped;

if the first power supply feedback point is closed and the second power supply feedback point is opened, the microcontroller judges that the second power supply is tripped;

if the first power supply feedback point is disconnected, a pin connected with the first triode in the microcontroller acquires a high level, a pin connected with the second triode in the microcontroller acquires a high level, and when the second power supply feedback point is disconnected, the microcontroller judges that the first power supply is tripped.

The embodiment of the invention has the following beneficial effects: the invention provides a tripping detection circuit and a method of a CB-level automatic transfer switch, which comprises the following steps: the microcontroller is used for controlling the power supply of the power supply to work; one end of the first power supply feedback point is connected with an external power supply, the other end of the first power supply feedback point is connected with one end of the second power supply feedback point, the other end of the second power supply feedback point is connected with an emitting electrode of a third triode, a base electrode of the third triode is connected with the microcontroller, and a collector electrode of the third triode is connected with the first relay; the collector of the first triode is connected with an external power supply, the base of the first triode is connected with the other end of the first power supply feedback point, and the emitter of the first triode is grounded; the collector of the second triode is connected with an external power supply, the base of the second triode is connected with the other end of the first power supply feedback point, and the emitter of the second triode is grounded; the first triode and the second triode are both connected with the micromotor. The circuit and the method provided by the invention can solve the technical problem that the prior art has difficulty in reading the point grabbing signal of the tripping feedback state, and can still realize tripping detection under the condition that a short circuit does not support a plurality of feedback nodes, thereby reducing the cost.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a circuit diagram of a trip detection circuit of a CB-class automatic transfer switch according to an embodiment of the present invention;

fig. 2 is a flowchart of a trip detection method for a CB-level automatic transfer switch according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, a trip feedback contact is connected in series in a motor power supply loop (the voltage of the motor power supply loop is AC220V or AC380V), the trip feedback contact is connected in series in the motor strong current loop and then feeds back a strong current signal, a controller of an automatic transfer switch is a weak current signal, and the controller reads the strong current signal in a trip feedback state to become difficult.

In order to facilitate understanding of the present embodiment, a detailed description is first given of a trip detection circuit of a CB-class automatic transfer switch disclosed in the embodiment of the present invention.

The first embodiment is as follows:

the embodiment of the invention provides a tripping detection circuit of a CB-level automatic transfer switch, which comprises:

the microcontroller is used for controlling the power supply of the power supply to work;

one end of the first power supply feedback point is connected with an external power supply, the other end of the first power supply feedback point is connected with one end of the second power supply feedback point, the other end of the second power supply feedback point is connected with an emitting electrode of the third triode, a base electrode of the third triode is connected with the microcontroller, and a collector electrode of the third triode is connected with the first relay;

the collector of the first triode is connected with an external power supply, the base of the first triode is connected with the other end of the first power supply feedback point, and the emitter of the first triode is grounded;

the collector of the second triode is connected with an external power supply, the base of the second triode is connected with the other end of the first power supply feedback point, and the emitter of the second triode is grounded;

the first triode and the second triode are both connected with the micromotor.

Preferably, the power supply further comprises a fourth triode and a second relay;

and the collector of the fourth triode is connected with the other end of the second power supply feedback point, and the fourth triode is connected with the second relay.

Specifically, when the first power supply is not tripped, the first power supply feedback point is closed, the first triode is conducted, the base of the triode outputs a high level, the triode is conducted at the moment, and the microcontroller pin reads a low level, otherwise, when the first power supply is tripped, the first power supply feedback point is disconnected, the triode is disconnected, the microcontroller pin reads a high level, and the second power supply is the same;

the 24V power supply is also a power supply for the coil of the relay, and is connected in series with a first power supply feedback point (S1) and a second power supply feedback point (S2), and finally, the coil of the relay. When the automatic transfer switch works normally and does not overflow, neither of the internal circuit breakers is tripped, the trip feedback contacts S1 and S2 are closed, and the power supply of the coil of the 24V relay is conducted. When the CPU controls the motor to drive and control the first relay, the coil of the first relay is electrified, the contact of the first relay can be normally closed, so that the motor is electrified, and the automatic change-over switch is normally changed. When tripping occurs, the tripping feedback point of S1 or S2 is disconnected, at the moment, the coil of the first relay is controlled by the motor drive to be not electrified, the first relay cannot work no matter whether the CPU is controlled or not, the motor drive contact of the first relay cannot be closed, the motor cannot be electrified, and the electrical forbidding conversion is realized; at this time, even if the CPU program is abnormal and an erroneous control command occurs, the contact of the first relay does not operate, the motor is not electrified, the automatic transfer switch is not switched, and safety is ensured.

Example two:

the second embodiment of the invention provides a tripping detection method of a CB-level automatic change-over switch,

the method comprises the following steps of obtaining the opening and closing state of a first power supply feedback point and the opening and closing state of a second power supply feedback point, and obtaining the opening and closing state of the first power supply feedback point and the opening and closing state of the second power supply feedback point by a microcontroller and judging:

if the first power supply feedback point and the second power supply feedback point are both opened and closed, the microcontroller judges that the trip is not generated;

if the first power supply feedback point is closed and the second power supply feedback point is opened, the microcontroller judges that the second power supply is tripped;

if the first power supply feedback point is disconnected, a pin connected with the first triode in the microcontroller acquires a high level, a pin connected with the second triode in the microcontroller acquires a high level, and the microcontroller judges that the first power supply is tripped.

Further, if a pin connected with the first triode in the microcontroller acquires a high level and a pin connected with the second triode in the microcontroller acquires a low level, the microcontroller judges that the system is abnormal.

Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.