CN114498549B - Control circuit and method for circuit breaker and electronic equipment - Google Patents
Control circuit and method for circuit breaker and electronic equipment Download PDFInfo
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- CN114498549B CN114498549B CN202210103111.XA CN202210103111A CN114498549B CN 114498549 B CN114498549 B CN 114498549B CN 202210103111 A CN202210103111 A CN 202210103111A CN 114498549 B CN114498549 B CN 114498549B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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Abstract
The application provides a control circuit, a method and electronic equipment for a circuit breaker, wherein in the control circuit, a current change rate comparison module outputs a first comparison signal according to the magnitude relation between the current change rate of a bus at the current moment and a first preset threshold value; the locking module outputs a second comparison signal; the safety current comparison module outputs a third comparison signal according to the magnitude relation between the current of the bus at the current moment and the safety current; the control module controls the circuit breaker to be turned off under the conditions that the current change rate of the first comparison signal representing the bus at the current moment is larger than a first preset threshold value, the current change rate of the second comparison signal representing the bus at the first moment is larger than the first preset threshold value and the current of the third comparison signal representing the bus at the current moment is larger than the safety current. By implementing the application, the circuit breaker can be controlled to make corresponding actions aiming at different fault types, and the requirements of the current standard on the circuit breaker are met.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a control circuit and method for a circuit breaker and electronic equipment.
Background
In a power supply system, a circuit breaker is required to realize a system fault protection function. The control method of the system fault protection adopted in the prior art is that when the current of a power supply system where the circuit breaker is located is overlarge, the circuit breaker is immediately controlled to be turned off. The control method is used for controlling the circuit breaker to be turned off immediately when the current of the power supply system exceeds a certain threshold value no matter what fault state the power supply system is in. However, according to the requirements for a circuit breaker in standard GB/T14048.1-2012, if the power supply system is struck by lightning, or the current caused by overload of the power supply system exceeds a certain threshold value, it is not desirable that the circuit breaker be turned off or turned off immediately. Namely, the control method in the prior art cannot meet the action requirement of the current standard on the breaker when the breaker breaks down, and the malfunction of the breaker is easy to cause.
Disclosure of Invention
The application provides a control circuit, a control method and electronic equipment for a circuit breaker, which can distinguish fault types of a power supply system, so that the circuit breaker is controlled to make corresponding actions aiming at different fault types, the requirements of the current standard on the circuit breaker are met, and the accuracy and the safety are high.
In a first aspect, an embodiment of the present application provides a control circuit of a circuit breaker, where the circuit breaker is connected in series to a bus of a power supply system, and the control circuit includes a current change rate comparison module, a locking module, a control module, and a safety current comparison module; the output end of the current change rate comparison module is coupled to the input end of the locking module and the first input end of the control module; the output end of the locking module is coupled with the second input end of the control module; the output end of the safety current comparison module is coupled with the third input end of the control module.
In specific implementation, the current change rate comparison module outputs a first comparison signal according to the magnitude relation between the current change rate of the bus at the current moment and a first preset threshold value; the locking module outputs a second comparison signal; the second comparison signal is determined according to the magnitude relation between the current change rate of the bus at the first moment and a first preset threshold value; the first moment is before the current moment and is separated from the current moment by a first preset time length; the control module determines that the power supply system is in a first state under the condition that the current change rate of the first comparison signal representing the current moment of the bus is larger than a first preset threshold value and the current change rate of the second comparison signal representing the current moment of the bus is larger than the first preset threshold value; the safety current comparison module outputs a third comparison signal according to the magnitude relation between the current of the bus at the current moment and the safety current; the control module is in a first state of the power supply system, the first state of the power supply system can be regarded as short circuit or normal load shedding, and under the condition that the current of the third comparison signal representing the current moment of the bus is larger than the safety current, the power supply system is regarded as short circuit, and the circuit breaker is controlled to be turned off, so that the protection of the power supply system is realized.
With reference to the first aspect, in a first possible implementation manner, the control module determines that the power supply system is in the second state when the current change rate of the first comparison signal representing the current moment of the bus is smaller than a first preset threshold value and the current change rate of the second comparison signal representing the first moment of the bus is larger than the first preset threshold value; at this point, the second state of the power supply system may be considered to be a lightning strike, and the control module controls the circuit breaker to be inactive.
With reference to the first aspect or with reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, when the power supply system is in the first state and the current of the third comparison signal at the current moment of the bus is smaller than the safety current, the control module 1112 considers that the power supply system is normally switched off, and no fault occurs, and does not need to control the circuit breaker to be turned off, that is, the circuit breaker is controlled to be inactive.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a third possible implementation manner, the control circuit further includes an over-current comparing module, and an output terminal of the over-current comparing module is coupled to a fourth input terminal of the control module.
In specific implementation, the overload current comparison module outputs a fourth comparison signal according to the magnitude relation between the current of the bus at the current moment and the overload current; wherein the overload current is greater than the safety current; the control module determines that the power supply system is in a third state under the condition that the current change rate of the first comparison signal representing the current moment of the bus is smaller than a first preset threshold value and the current change rate of the second comparison signal representing the current moment of the bus is smaller than the first preset threshold value; at this point, the third state of the power supply system may be considered to be overloaded or operating properly. And under the condition that the power supply system is in a third state and the fourth comparison signal indicates that the current of the bus at the current moment is larger than the overload current, the control module considers that the power supply system is overloaded and controls the circuit breaker to be turned off.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, when the power supply system is in the third state and the current of the fourth comparison signal representing the current moment of the bus is smaller than the overload current, the control module considers that the power supply system works normally and controls the circuit breaker to not act.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner, the circuit breaker includes a mechanical switch and a solid-state switch connected in parallel with the mechanical switch; the solid-state switch is firstly closed in the closing process of the circuit breaker; and the control module controls the solid-state switch to be turned off if the current change rate of the bus at the current moment is larger than a first preset threshold value and the current of the bus at the current moment is larger than the overload current in the switching-on process of the circuit breaker.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the control module continues to control the mechanical switch to be turned on when the current change rate of the bus at the current moment is smaller than a first preset threshold value or the current of the bus at the current moment is smaller than an overload current in the process of closing the circuit breaker.
With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner, the circuit breaker includes a mechanical switch and a solid-state switch connected in parallel with the mechanical switch; the control module also comprises a mechanical control sub-module and a delay sub-module; the mechanical control sub-module controls the mechanical switch to be turned off, and the delay sub-module delays a second preset time period after the mechanical switch is turned off to control the solid-state switch to be turned off.
With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner, the delaying submodule delays, after the mechanical switch is turned off, the second preset duration to control the solid-state switch to be turned off, and specifically implemented as follows: and when the current passing through the mechanical switch in the turn-off process of the mechanical switch is smaller than the preset reference current, the delay submodule delays a second preset time period to control the solid-state switch to be turned off.
With reference to the seventh possible implementation manner to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the mechanical switch is not operated when the solid-state switch is in an off state.
In a second aspect, an embodiment of the present application provides a control method for a circuit breaker, where the circuit breaker is connected in series to a bus of a power supply system, the control method specifically includes: the current change rate of the bus at the current moment is larger than a first preset threshold value, and the current change rate of the bus at the first moment is larger than the first preset threshold value, so that the power supply system is determined to be in a first state; the first moment is before the current moment and is separated from the current moment by a first preset time length; and under the condition that the power supply system is in the first state and the current of the bus at the current moment is larger than the safety current, controlling the circuit breaker to be turned off.
With reference to the second aspect, in a first possible implementation manner, a current change rate of the bus at the current moment is smaller than a first preset threshold, and the current change rate of the bus at the first moment is larger than the first preset threshold, so as to determine that the power supply system is in a second state; when the power supply system is in the second state, the control circuit breaker does not operate.
With reference to the second aspect or with reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, if the current at the current moment of the bus is less than the safety current in a case that the power supply system is in the first state, the circuit breaker is controlled to be not operated.
With reference to the second aspect or any one of the foregoing possible implementation manners of the second aspect, in a third possible implementation manner, when a current change rate at a current moment of the bus is smaller than a first preset threshold value, and a current change rate at the first moment of the bus is smaller than the first preset threshold value, determining that the power supply system is in a third state; when the power supply system is in a third state and the current of the bus at the current moment is larger than the overload current, the circuit breaker is controlled to be turned off; wherein the overload current is greater than the safety current.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, in a case that the power supply system is in the third state and the current at the current moment of the bus is less than the overload current, the circuit breaker is controlled to be not operated.
With reference to the second aspect or any one of the possible implementation manners of the second aspect, in a fifth possible implementation manner, the circuit breaker includes a mechanical switch and a solid-state switch connected in parallel with the mechanical switch; the solid-state switch is firstly closed in the closing process of the circuit breaker; and in the switching-on process of the circuit breaker, if the current change rate of the bus at the current moment is larger than a first preset threshold value and the current of the bus at the current moment is larger than the overload current, controlling the solid-state switch to be switched off.
With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, during closing of the circuit breaker, if a current change rate of the bus at the current moment is smaller than a first preset threshold value, or a current of the bus at the current moment is smaller than an overload current, the mechanical switch is continuously controlled to be closed.
With reference to the second aspect or any one of the possible implementation manners of the second aspect, in a seventh possible implementation manner, the circuit breaker includes a mechanical switch and a solid-state switch connected in parallel with the mechanical switch; the circuit breaker is controlled to be turned off, and the method can be specifically realized as follows: and controlling the mechanical switch to be turned off, and delaying a second preset time period after the mechanical switch is controlled to be turned off to control the solid-state switch to be turned off.
With reference to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner, the solid-state switch is controlled to be turned off by delaying a second preset duration after the mechanical switch is controlled to be turned off, which is specifically implemented: in the process of controlling the mechanical switch to be turned off, acquiring current passing through the mechanical switch; and when the current passing through the mechanical switch is smaller than the preset reference current, delaying the second preset duration to control the solid-state switch to be turned off.
With reference to the seventh possible implementation manner to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, the mechanical switch is not operated when the solid-state switch is in an off state.
In a third aspect, an embodiment of the present application provides an electronic device, including a circuit breaker and a control circuit for the circuit breaker in combination with the first aspect or in combination with any one of the possible implementations of the first aspect.
It should be understood that the implementation and advantages of the various aspects of the application described above may be referenced to one another.
Drawings
FIG. 1 is a block diagram of an electronic device according to an embodiment of the present application;
fig. 2 is a block diagram of a control circuit for a circuit breaker according to an embodiment of the present application;
Fig. 3 is a block diagram of a control circuit for a circuit breaker according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a control circuit for a circuit breaker according to an embodiment of the present application;
FIGS. 5A-5B are schematic circuit diagrams of a portion of a control module according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram of a control circuit for a circuit breaker according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The implementation of the technical scheme of the application is further described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram of an electronic device according to an embodiment of the present application. As shown in fig. 1, an electronic device 11 is provided between a power source 12 and a load 13, and the electronic device 11 includes a circuit breaker 110 and a control circuit 111. In a specific implementation, the circuit breaker 110 may be connected in series to a positive BUS bar bus+ between the power source 12 and the load 13, or the circuit breaker 110 may be connected in series to a negative BUS bar BUS (not shown) between the power source 12 and the load 13, or the positive BUS bar bus+ and the negative BUS bar BUS are respectively connected in series to a circuit breaker (not shown). In general, the present application does not limit the number of circuit breakers and the bus bar positions in which the circuit breakers are disposed.
The control circuit 111 may establish at least one of an electrical connection or a mechanical connection with the circuit breaker 110. Illustratively, the circuit breaker 110 is specifically a solid state switch (solid state breaker), and the control circuit 111 is electrically connected to a control terminal of the solid state switch, and controls the on or off of the solid state switch by controlling a level of the control terminal of the solid state switch; or the circuit breaker 110 is specifically a mechanical switch (MECHANICAL BREAKER), the mechanical switch comprises a fixed contact and a movable contact, the fixed contact is connected in series on the positive BUS bus+, a mechanical linkage connection relationship is formed between the movable contact and the control circuit 111, and the control circuit 111 can control the closing or opening of the mechanical switch by controlling the contact or separation of the movable contact and the fixed contact of the mechanical switch; or the circuit breaker 110 is specifically a hybrid circuit breaker (hybrid solid state breaker) that includes both a solid state switch and a mechanical switch, the control circuit 111 establishes an electrical connection with both the control terminal of the solid state switch and the moving contact of the mechanical switch in mechanical linkage.
The power source 12 may be, for example, a power cell (e.g., nickel-cadmium, nickel-hydrogen, lithium ion, lithium polymer, etc.), a battery, a photovoltaic panel, or an electrical grid, among others. Alternatively, the power supply 12 may be used to couple a higher level circuit such as an AC/DC converter (ALTERNATING CURRENT/Direct-Currentconverter) or other DC/DC converter (e.g., BUCK converter, BOOST converter, BUCK-BOOST converter, etc.), etc. In other words, the power source 12 may be a direct power source or an indirect power source transmitted through a circuit.
The load 13 may be, for example, a photovoltaic inverter, an electric car, another DC/DC converter, a DC/AC converter (Direct-Current/ALTEMATING CURRENTCONVERTER), or the like.
In some possible embodiments, the control circuit 111 may include individual components, embodied as individual packaged components soldered to a printed circuit board (Printed Circuit Board, PCB).
Alternatively, in some possible embodiments, the control circuit 111 may be disposed inside a chip, that is, the components included in the control circuit 111 may be manufactured by doping, exposing, and the like on silicon using silicon as a body. That is, the control circuit 111 may be embodied as a central processing unit (central processing unit, CPU), other general purpose processor, digital signal processor (DIGITAL SIGNAL processor, DSP), application Specific Integrated Circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like.
In some possible embodiments, a rogowski coil may also be provided on the BUS (e.g., positive BUS bus+), which may detect the rate of change of current of the positive BUS bus+, and transmit the detected rate of change of current to the control circuit 111.
In the embodiment of the application, the control circuit 111 adopts different circuit structures, obtains the current change rate of the bus and the current of the bus, and distinguishes the fault type of the power supply system according to at least one or more of the magnitude relation between the current change rate of the bus and the first preset threshold, the magnitude relation between the current of the bus and the safety current and the magnitude relation between the current of the bus and the overload current, so that the control circuit breaker can make corresponding actions according to different fault types, the requirement of the current standard on the circuit breaker is met, the accuracy is high, and the safety is good.
The specific structure of the control circuit for the circuit breaker will be described with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a block diagram of a control circuit for a circuit breaker according to an embodiment of the present application. As shown in fig. 2, the control circuit includes a current change rate comparison module 1110, a lock module 1111, a control module 1112, and a safety current comparison module 1113. Wherein the output of the current change rate comparison module 1110 is coupled to the input of the locking module 1111 and the first input ① of the control module 1112; an output of the locking module 1111 is coupled to a second input ② of the control module 1112; an output of the safety current comparison module 1113 is coupled to a third input ③ of the control module 1112.
It should be noted that the term "coupled" as used herein refers to either a direct or an indirect connection. For example, a may be coupled to B, either directly, or indirectly, through one or more other electrical components, such as directly, and C may be directly, and directly, such that a connection is achieved between a and B through C.
The current change rate comparison module 1110 may output a first comparison signal according to a magnitude relationship between a current change rate of the bus at a current time and a first preset threshold. For example, the current change rate of the bus may be denoted as di/dt, the first preset threshold may be denoted as shortcircuit _min, and if at the present moment, di/dt is greater than shortcircuit _min, the first comparison signal is at a high level (i.e. 1); if at the current time, di/dt is less than shortcircuit _min, the first comparison signal is low (i.e., 0).
The locking module 1111 outputs a second comparison signal determined according to the magnitude relationship between the current change rate of the bus bar at the first time and the first preset threshold. The first time is before the current time and is separated from the current time by a first preset time length. The locking module 1111 may be embodied as a rising edge triggered delay and may lock the output of the current change rate comparison module 1110 at the first time. That is, at the first time, di/dt is greater than shortcircuit _min, the output of the current change rate comparing module 1110 at the first time is at a high level (i.e. 1), and the output of the current change rate comparing module 1110 before the first time is at a low level (i.e. 0), then the locking module 1111 monitors a rising edge of the output of the current change rate comparing module 1110 at the first time, and triggers the locking module 1111 to lock the high level for a first preset period of time. Optionally, the locking module 1111 may further be provided with an inverter, and the locking module 1111 outputs a low level (i.e. 0) for a first preset period of time, and resumes outputting a high level (i.e. 1) after the first preset period of time.
The first preset duration is related to a parameter value selected by RC in the lock module, for example, the first preset duration may be 30 μs. In practical application, the first preset duration can be determined according to the test standard requirements of the standard on lightning stroke, and different RC parameters are selected based on different first preset durations.
The control module 1112 determines that the power supply system is in the first state when the first comparison signal indicates that the current change rate of the bus at the current time is greater than a first preset threshold (i.e., the first comparison signal is 1), and the second comparison signal indicates that the current change rate of the bus at the first time is greater than the first preset threshold (i.e., the second comparison signal is 1). In other words, the control module 1112 determines that the power supply system is in the first state if the current rate of change of the bus bar is greater than the first preset threshold for a period of time that is longer than the first preset duration. The first state of the power supply system may be considered to be a short circuit or a normal cut load.
The safety current comparison module 1113 may output a third comparison signal according to a magnitude relation between the current of the bus bar at the present time and the safety current. For example, the current of the bus may be denoted as I BUS, the safety current may be denoted as I nom, and if at the present moment I BUS is greater than I nom, the third comparison signal is high (i.e., 1); if at the current time, I BUS is less than I nom, the third comparison signal is low (i.e., 0). Wherein the safety current is related to the individual devices used in the power supply system, i.e. the safety current is a device property, which may be 500A for example.
When the power supply system is in the first state and the current of the bus at the current moment represented by the third comparison signal is greater than the safety current (i.e. the third comparison signal is 1), the control module 1112 considers that the power supply system is short-circuited, and controls the circuit breaker to be turned off. Because the circuit breaker is connected in series on the bus of the power supply system, the control module 1112 controls the circuit breaker to be turned off, and cuts off the path of the power supply for supplying power to the load, thereby realizing the protection of the power supply system.
In some possible embodiments, when the power supply system is in the first state and the current of the bus at the current moment represented by the third comparison signal is smaller than the safety current (i.e., the third comparison signal is 0), the control module 1112 considers that the power supply system is normally switched off, and no fault occurs, and the circuit breaker is not required to be controlled to be turned off, i.e., the control module 1112 controls the circuit breaker to be inactive.
It should be noted that, the present application is based on the control of the power supply system when it is operating normally, that is, the circuit breaker is closed in the default state, and the control module controlling the circuit breaker to be inactive may be understood as the control module controlling the circuit breaker to be in the closed state.
In some possible embodiments, the control module 1112 determines that the power supply system is in the second state if the first comparison signal indicates that the current rate of change of the bus at the current time is less than the first preset threshold (i.e., the first comparison signal is 0), and the second comparison signal indicates that the current rate of change of the bus at the first time is greater than the first preset threshold (i.e., the second comparison signal is 1). In other words, the control module 1112 determines that the power supply system is in the second state if the current rate of change of the bus is greater than the first preset threshold, but the current rate of change of the bus decreases to less than the first preset threshold after the first preset period. At this time, the second state of the power supply system may be considered to be that a lightning strike has occurred.
When the power supply system is in the second state, the control module 1112 considers that the power supply system is struck by lightning and controls the circuit breaker to be inactive, so that the circuit breaker is prevented from being turned off by mistake when the lightning strikes occur.
In the embodiment of the application, the locking module is added in the control circuit, so that the control circuit can output the current change rate of the bus at the first moment, and the power supply system can be distinguished from lightning stroke, short circuit and normal load shedding according to the magnitude relation between the current change rate of the bus at the current moment and the first preset threshold value and the magnitude relation between the current change rate of the bus at the first moment and the first preset threshold value; and the short circuit is further distinguished from normal cut load according to the magnitude relation between the current of the bus and the safety current. The control circuit provided by the embodiment of the application can distinguish short circuit, normal load shedding and lightning stroke, so that different operations can be performed aiming at different types of faults, the accuracy of the operations is improved, and the requirements of the current standard on the circuit breaker are met.
Referring to fig. 3, fig. 3 is a block diagram illustrating a control circuit for a circuit breaker according to an embodiment of the present application. As shown in fig. 3, the control circuit further comprises an over-current comparison module 1114, an output of the over-current comparison module 1114 being coupled to a fourth input ④ of the control module 1112.
In a specific implementation, the overload current comparison module 1114 may output a fourth comparison signal according to a magnitude relation between the current of the bus at the current time and the overload current. For example, the current of the bus may be denoted as I BUS, the overload current may be denoted as I overload_max, and if at the present moment I BUS is greater than I overload_max, the fourth comparison signal is high (i.e., 1); if at the current time, I BUS is smaller than I overload_max, the fourth comparison signal is low (i.e., 0). The overload current is also related to each device used in the power supply system, but is greater than the safety current, which may be 1000A, for example. In some possible embodiments, the control module 1112 determines that the power supply system is in the third state if the first comparison signal characterizes the current change rate of the bus at the current time is less than a first preset threshold (i.e., the first comparison signal is 0), and the second comparison signal characterizes the current change rate of the bus at the first time is less than the first preset threshold (i.e., the second comparison signal is 0). At this point, the third state of the power supply system may be considered to be overloaded or operating properly.
For example, when the power supply system is in the third state and the current of the fourth comparison signal indicates that the current of the bus at the present moment is greater than the overload current (i.e., the fourth comparison signal is 1), the control module 1112 considers that the power supply system is overloaded, and controls the circuit breaker to be turned off.
For another example, when the power supply system is in the third state and the current of the fourth comparison signal indicates that the current of the bus at the current moment is less than the overload current (i.e., the fourth comparison signal is 0), the control module 1112 considers that the power supply system is working normally, and controls the circuit breaker to not act.
In summary, the power supply circuit provided by the embodiment of the application can distinguish working conditions of short circuit, lightning stroke, overload, normal load shedding and normal working, can control the circuit breaker to make different actions according to different fault types, meets the requirements of the current standard on the circuit breaker, and has high accuracy and good safety.
Specific circuit diagrams of the control circuit provided in the embodiment of the present application are exemplarily described below with reference to fig. 4 to 6.
In some possible implementations, referring to fig. 4, fig. 4 is a schematic circuit diagram of a control circuit for a circuit breaker according to an embodiment of the present application. As shown in fig. 4, the locking module 1111 includes a monostable 1 and a nand gate Q 41; the control module 1112 includes an AND gate Q 42, an AND gate Q 43, an AND gate Q 44, an OR gate Q 45, and a latch U 41.
In particular implementations, the output of the current rate comparison module 1110 is coupled to the input of the monostable 1, one input of the AND gate Q 42, and the input of the latch U 41; and the output of monostable 1 is coupled to two inputs of nand gate Q 41, and the output of nand gate Q 41 is coupled to the other input of and gate Q 42; the output of AND gate Q 42 is coupled to one input of AND gate Q 43, the other input of AND gate Q 43 is coupled to safe current comparison module 1113, and the output of AND gate Q 43 is coupled to one input of OR gate Q 45; an output of latch U 41 is coupled to one input of and gate Q 44, an output of over-current comparison block 1114 is coupled to another input of and gate Q 44, and an output of and gate Q 44 is coupled to another input of or gate Q 45.
Illustratively, when the control module 1112 considers that the power supply system is shorted, then there are: the current change rate of the bus at the current moment is greater than a first preset threshold, i.e. di/dt is greater than shortcircuit _min, the first comparison signal output by the current change rate comparison module 1110 at the current moment is at a high level (i.e. 1), and one input end of the and gate Q 42 is at 1. And, the current change rate of the bus at the first moment is also greater than the first preset threshold, and the output of the current change rate comparison module 1110 at the first moment is also 1, so that the monostable trigger 1 is triggered to maintain the first preset time from the first moment to the output of the high level at the current moment (i.e. 1) and then to restore to the low level (i.e. 0). In other words, the nand gate Q 4 1 outputs 1 at the current time, and the other input terminal of the and gate Q 42 is also 1. At this time, if both input terminals of the and gate Q 42 are 1, the and gate Q 42 outputs 1 (i.e., one input terminal of the and gate Q 43 is 1). In addition, the current of the bus at the present moment is greater than the safety current, i.e. I BUS＞Inom, and the safety current comparing module 1113 outputs a high level (i.e. 1), then the other input terminal of the and gate Q 43 is also 1. In general, both inputs of AND gate Q 43 are 1, and gate Q 43 outputs a1 (i.e., one input of OR gate Q 45 is 1), then regardless of whether the other input of OR gate Q 45 is 0 or 1, The output of or gate Q 45 (i.e., point a) is high, which can control the circuit breaker to turn off.
The control module 1112 considers that the power supply system is normally off-load, although the first comparison signal output by the current change rate comparison module 1110 at the current time is 1, and the second comparison signal output by the locking module 1111 at the current time is also 1 (i.e. the nand gate Q 41 also outputs 1). At this time, both input terminals of the and gate Q 42 are 1, the and gate Q 42 outputs 1, and one input terminal of the and gate Q 43 is 1. But the current of the bus at the present moment is smaller than the safe current, i.e. I BUS＜Inom, and the safe current comparing module 1113 outputs a low level (i.e. 0), the other input terminal of the and gate Q 43 is 0. In general, the AND gate Q 43 has one input of 0, the AND gate Q 43 outputs 0 (i.e., one input of OR gate Q 45 is 0), and the overload current is greater than the safety current, i.e., I nom＜Ioverload_max, and I BUS＜Ioverload_max is present, the overload current comparison module 1114 outputs a low level (i.e., 0), such that the AND gate Q 44 has one input of 0, the AND gate Q 44 outputs 0 (i.e., the other input of OR gate Q 45 is also 0), and therefore the output of OR gate Q 45 (i.e., point A) is low, and point A is low.
It should be noted that, the present application is based on the control of the normal operation of the power supply system, that is, the circuit breaker is closed in the default state, and the point a is low level at this time, which is also understood as controlling the circuit breaker to be inactive.
The control module 1112 considers that the power supply system is struck by lightning, and then: the current change rate of the bus at the current moment is smaller than a first preset threshold, i.e. di/dt is smaller than shortcircuit _min, the first comparison signal output by the current change rate comparison module 1110 at the current moment is at a low level (i.e. 0), at this moment, if one input end of the and gate Q 42 is 0, the and gate Q 42 outputs 0 (i.e. one input end of the and gate Q 43 is 0), and the and gate Q 43 outputs 0 (i.e. one input end of the or gate Q 45 is 0). In addition, the current change rate of the bus at the first moment is greater than the first preset threshold, the current change rate comparing module 1110 outputs 1 at the first moment, and the latch U 41 is triggered by the rising edge, so that the latch U 41 outputs 0 to the and gate Q 44 from the first moment, so that one input end of the and gate Q 44 is 0, the and gate Q 44 outputs 0 (i.e. the other input end of the or gate Q 45 is also 0), and therefore, the output end of the or gate Q 45 (i.e. the point a) is low, the point a is low, and the circuit breaker is controlled to be inactive, so as to keep the circuit breaker closed.
When the control module 1112 considers that the power supply system is overloaded, then there are: the current change rate of the bus at the first moment is smaller than the first preset threshold, the current change rate of the bus at the current moment is also smaller than the first preset threshold, i.e. di/dt is smaller than shortcircuit _min, the current change rate comparison module 1110 outputs a low level (i.e. 0) at the current moment and the first moment, and the latch U 41 is triggered by a rising edge, so that the latch U 41 outputs 1 to the and gate Q 44 from the first moment to the current moment, so that one input terminal of the and gate Q 44 is 1. In addition, the current of the bus at the current moment is greater than the overload current, i.e. I BUS＞Ioverload_max, and the overload current comparison module 1114 outputs 1, then the other input terminal of the and gate Q 44 is also 1. In general, the two inputs of AND gate Q 44 are both 1 and AND gate Q 44 outputs a1 (i.e., one input of OR gate Q 45 is a 1), then the output of OR gate Q 45 (i.e., point A) is high, which can control the circuit breaker to turn off, regardless of whether the other input of OR gate Q 45 is a 0 or a 1.
When the control module 1112 considers that the power supply system is working normally, there are: the current change rate of the bus at the first moment is smaller than the first preset threshold, the current change rate of the bus at the current moment is also smaller than the first preset threshold, i.e. di/dt is smaller than shortcircuit _min, the current change rate comparison module 1110 outputs a low level (i.e. 0) at the current moment and the first moment, at this time, the and gate Q 42 has one input terminal of 0, the and gate Q 42 outputs 0 (i.e. one input terminal of the and gate Q 43 is 0), and the and gate Q 43 outputs 0 (i.e. one input terminal of the or gate Q 45 is 0). And, the current of the bus at the current moment is smaller than the overload current, i.e. I BUS＜Ioverload_max, the overload current comparison module 1114 outputs 0, the other input end of the and gate Q 44 is also 0, the and gate Q 44 outputs 0 (i.e. one input end of the or gate Q 45 is 0), the two input ends of the or gate Q 45 are both 0, the output end of the or gate Q 45 (i.e. point a) is low level, point a is low level, the circuit breaker is controlled to be not operated, and the circuit breaker is kept closed.
In some possible implementations, the circuit breaker provided by the embodiment of the application can be a hybrid circuit breaker, and the hybrid circuit breaker comprises a mechanical switch and a solid-state switch connected in parallel with the mechanical switch. It can be seen that the adoption of the hybrid circuit breaker can combine the advantages of small conduction loss of the mechanical switch and high solid-state switching speed.
The control module provided by the embodiment of the application further comprises a mechanical control sub-module and a delay sub-module. The mechanical control sub-module can control the mechanical switch to be turned off, and the delay sub-module can delay a second preset duration to control the solid-state switch to be turned off after the mechanical switch is turned off. Specific circuit implementations may be seen in fig. 5A-5B.
Referring to fig. 5A, fig. 5A is a schematic circuit diagram of a portion of a control module according to an embodiment of the present application. As shown in fig. 5A, the mechanical control submodule 11121 includes a latch U 51 and the control module 1112 shown in fig. 4 described above, and the delay submodule 11122A may include a monostable flip-flop 2, a nand gate Q 51, a and gate Q 52, and a latch U 52.
The point a described in fig. 4 is coupled to the input terminal of the latch U 51, and the level of one output terminal (i.e., point B) of the latch U 51 controls the mechanical switch to be turned on or off. The input of the monostable 2 and one input of the and gate Q 52 are coupled at the point B, the output of the monostable 2 is coupled to two inputs of the nand gate Q 51, the output of the nand gate Q 51 is coupled to the other input of the and gate Q 52, the output of the and gate Q 52 is coupled to the input of the latch U 52, and the level of one output (i.e., point C) of the latch U 52 controls the closing or opening of the solid state switch. In the schematic circuit diagram shown in fig. 5A, when the B-point level output of the mechanical control sub-module 11121 is high, the mechanical switch is controlled to be turned off, the monostable trigger 2 is triggered to maintain the output high level for a second preset period of time and then to return to low level, the nand gate Q 51 correspondingly maintains the output low level for the second preset period of time and then returns to high level, when the nand gate Q 51 returns to output high level, the and gate Q 52 outputs high level, and one output end (i.e., point C) of the trigger latch U 52 outputs low level, so as to control the solid switch to be turned off.
Further, referring to fig. 5B, the schematic circuit diagram shown in fig. 5B differs from the schematic circuit diagram shown in fig. 5A in that the delay sub-module 11122B in fig. 5B further includes a commutation state judgment sub-module, one input terminal of the and gate Q 52 is coupled to the output terminal of the nand gate Q 51, and the other input terminal of the and gate Q 52 is coupled to the output terminal of the commutation state judgment sub-module. The commutation state judging submodule is specifically used for judging the magnitude relation between the current passing through the mechanical switch and the preset reference current in the turn-off process of the mechanical switch. For example, when the current passing through the mechanical switch during the turn-off process of the mechanical switch is smaller than the preset reference current, the commutation state judgment submodule outputs a high level (i.e. 1), and the and gate Q 52 may output a high level after the second preset of the high level is output at the point B, and trigger one output end (i.e. point C) of the latch U 52 to output a low level, so as to control the solid-state switch to be turned off. The magnitude of the preset reference current is preset according to the specific use of the power supply system, and may be 50A, for example.
For example, the mechanical switch may be deactivated by providing interlocking means (not shown) at points B and C, such that the solid state switch is in an off state.
In some possible implementations, referring to fig. 6, fig. 6 is a schematic circuit diagram of a control circuit for a circuit breaker according to an embodiment of the present application. As shown in fig. 6, in the embodiment described above in connection with fig. 4 to 5B, the control module provided in the embodiment of the present application further includes an and gate Q 61, an and gate Q 62, and an or gate Q 63. Wherein, one input end of the and gate Q 61 is coupled to the current change rate comparison module 1110, the other input end of the and gate Q 61 is coupled to the overload current comparison module 1114, the output end of the and gate Q 61 is coupled to one input end of the and gate Q 62, the other input end of the and gate Q 62 is used for receiving a closing command for the circuit breaker, the output end of the and gate Q 62 is coupled to one input end of the or gate Q 63, the other input end of the or gate Q 63 is coupled to the output end of the and gate Q 52, and the output end of the or gate Q 63 is coupled to the latch U 52.
The embodiment of the application adds a way of controlling the solid state switch to be turned off by arranging an or gate Q 63 between the and gate Q 52 and the latch U 52. In a specific implementation, the other input end of the and gate Q 62 receives a closing instruction for the circuit breaker (i.e., the other input end of the and gate Q 62 is 1), and the solid switch is closed first at this time, but if the power supply system fails, i.e., the current change rate of the bus at the current moment is greater than a first preset threshold (i.e., the current change rate comparison module 1110 outputs 1), and the current of the bus at the current moment is greater than the overload current (i.e., the overload current comparison module 1114 outputs 1), both input ends of the and gate Q 61 are 1, and the and gate Q 61 outputs 1, so that one input end of the and gate Q 62 is 1. In addition, the other input end of the and gate Q 62 receives a closing command for the circuit breaker (i.e., the other input end of the and gate Q 62 is also 1), the and gate Q 62 outputs 1, the or gate Q 63 outputs 1, and one output end (i.e., point D) of the latch U 52 outputs a low level to control the solid-state switch to be turned off.
Optionally, if the power supply system fails, that is, the current change rate of the bus at the current time is less than the first preset threshold (that is, the current change rate comparing module 1110 outputs 0), or the current of the bus at the current time is less than the overload current (that is, the overload current comparing module 1114 outputs 0), any input terminal of the and gate Q 61 is 0, the and gate Q 61 outputs 0, so that one input terminal of the and gate Q 62 is 0, the and gate Q 62 outputs 0, and the branches of the and gate Q 61 and the and gate Q 62 are disabled, the control circuit may continuously control the mechanical switch to be closed.
Because the solid-state switch is closed first and then the mechanical switch is closed when the hybrid circuit breaker is closed, the solid-state switch is closed instead of continuously closing the mechanical switch under the condition that short circuit occurs in the closing process.
It will be appreciated that the circuits shown in fig. 4 to 6 are only exemplary, and that other circuit representations are possible, for example, the nand gate may be specifically a connection of an and gate and an not gate, the monostable flip-flop may be a delay, etc. The safety current comparison module, the current change rate comparison module and the overload current comparison module may refer to the application of the comparator in the prior art, and will not be described herein.
In some possible embodiments, the circuits shown in fig. 4 to 6 may be made of silicon as a body by doping, exposing, etc. the silicon. Namely, the control of the circuit breaker in the embodiment of the application can be realized by a controller.
The controller can determine that the power supply system is in a first state when the current change rate of the bus at the current moment is greater than a first preset threshold value and the current change rate of the bus at the first moment is greater than the first preset threshold value; the first time is before the current time and is separated from the current time by a first preset time length.
For example, the controller controls the circuit breaker to be turned off when the power supply system is in the first state and the current of the bus at the present moment is greater than the safety current.
For another example, when the power supply system is in the first state, the controller controls the circuit breaker to be inactive if the current of the bus at the present time is smaller than the safety current.
In some possible embodiments, the controller determines that the power supply system is in the second state when the current change rate of the bus at the current moment is less than a first preset threshold value and the current change rate of the bus at the first moment is greater than the first preset threshold value; and in the case that the power supply system is in the second state, the control circuit breaker is not operated.
Optionally, when the current change rate of the bus at the current moment is smaller than a first preset threshold value and the current change rate of the bus at the first moment is smaller than the first preset threshold value, the controller determines that the power supply system is in a third state; and under the condition that the power supply system is in a third state and the current of the bus at the current moment is larger than the overload current, the circuit breaker is controlled to be turned off, wherein the overload current is larger than the safety current.
Or the controller controls the breaker to be not operated under the condition that the power supply system is in a third state and the current of the bus at the current moment is smaller than the overload current.
In some possible embodiments, the circuit breaker includes a mechanical switch and a solid state switch in parallel with the mechanical switch; the solid-state switch is closed firstly in the closing process of the circuit breaker. Before the controller determines that the power supply system is in the first state, in the process of controlling the circuit breaker to be switched on, if the current change rate of the bus at the current moment is larger than a first preset threshold value and the current of the bus at the current moment is larger than the overload current, the controller controls the solid-state switch to be switched off.
Optionally, in the process of controlling the circuit breaker to close, if the current change rate of the bus at the current moment is smaller than a first preset threshold value or the current of the bus at the current moment is smaller than the overload current, the controller continues to control the mechanical switch to close.
In some possible embodiments, the controller controls the mechanical switch to be turned off, and delays the second preset time period after controlling the mechanical switch to be turned off to control the solid state switch to be turned off.
Further, the controller obtains the current passing through the mechanical switch in the process of controlling the mechanical switch to be turned off; and when the current passing through the mechanical switch is smaller than the preset reference current, delaying the second preset duration to control the solid-state switch to be turned off.
Alternatively, the controller may control the mechanical switch to be inactive with the solid state switch in an off state.
The embodiment of the present application specifically implements control of the circuit breaker by the controller, and the signal data flow inside the controller may refer to the embodiments described above with reference to fig. 2 to 6, so that the technical effects of the embodiments described above with reference to fig. 2 to 6 may be implemented, which are not described herein.
It should be noted that the above-described terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (19)
1. The control circuit for the circuit breaker is characterized in that the circuit breaker is connected in series on a bus of a power supply system, and comprises a current change rate comparison module, a locking module, a control module, an overload current comparison module and a safety current comparison module; wherein the output end of the current change rate comparison module is coupled to the input end of the locking module and the first input end of the control module; the output end of the locking module is coupled with the second input end of the control module; the output end of the safety current comparison module is coupled with the third input end of the control module, and the output end of the overload current comparison module is coupled with the fourth input end of the control module;
The current change rate comparison module is used for outputting a first comparison signal according to the magnitude relation between the current change rate of the bus at the current moment and a first preset threshold value;
The locking module is used for outputting a second comparison signal; the second comparison signal is output after a first preset time is determined and locked according to the magnitude relation between the current change rate of the bus at the first moment and the first preset threshold value; wherein the first time is before the current time and is separated from the current time by the first preset time length;
The control module is configured to determine that the power supply system is in a first state when the first comparison signal indicates that the current change rate of the bus at the current moment is greater than the first preset threshold, and the second comparison signal indicates that the current change rate of the bus at the first moment is greater than the first preset threshold;
the safety current comparison module is used for outputting a third comparison signal according to the magnitude relation between the current of the bus at the current moment and the safety current;
the control module is further used for controlling the circuit breaker to be turned off under the condition that the power supply system is in the first state and the third comparison signal represents that the current of the bus at the current moment is larger than the safety current;
The overload current comparison module is used for outputting a fourth comparison signal according to the magnitude relation between the current of the bus at the current moment and the overload current; wherein the overload current is greater than the safety current;
The control module is further configured to determine that the power supply system is in a third state when the first comparison signal indicates that the current change rate of the bus at the current moment is smaller than the first preset threshold value, and the second comparison signal indicates that the current change rate of the bus at the first moment is smaller than the first preset threshold value;
the control module is further used for controlling the circuit breaker to be turned off under the condition that the power supply system is in the third state and the fourth comparison signal indicates that the current of the bus at the current moment is larger than the overload current;
wherein the locking module comprises a monostable trigger 1 and a NAND gate The control module comprises an AND gateAnd gateAnd gateOR gateLatch deviceThe output end of the current change rate comparison module is coupled to the input end of the monostable trigger 1 and the AND gateIs connected with the input end of the (a) the latchAn output of the monostable 1 is coupled to the NAND gateIs provided with a pair of input terminals, the NAND gateIs coupled to the AND gate at its outputIs connected with the other input end of the AND gateIs coupled to the AND gate at its outputIs an input of the AND gateIs coupled to the other input of the safety current comparison module, the AND gateIs coupled to the OR gateIs connected to the input of the latchIs coupled to the AND gateAn output of the over-current comparing module is coupled to the AND gateIs connected with the other input end of the AND gateIs coupled to the OR gateIs provided with a first input terminal for receiving a signal, the OR gateAs an output of the control module.
2. The control circuit of claim 1, wherein,
The control module is further configured to determine that the power supply system is in a second state when the first comparison signal indicates that the current change rate of the bus at the current moment is smaller than the first preset threshold value, and the second comparison signal indicates that the current change rate of the bus at the first moment is larger than the first preset threshold value;
And the control module is also used for controlling the circuit breaker to be not operated under the condition that the power supply system is in the second state.
3. The control circuit of claim 1, wherein,
The control module is further configured to control the circuit breaker to be inactive when the power supply system is in the first state and the third comparison signal indicates that the current at the current moment of the bus is smaller than the safety current.
4. The control circuit of claim 1, wherein,
And the control module is further used for controlling the circuit breaker to be not operated under the condition that the power supply system is in the third state and the fourth comparison signal indicates that the current of the bus at the current moment is smaller than the overload current.
5. The control circuit of any of claims 1-4, wherein the circuit breaker comprises a mechanical switch and a solid state switch in parallel with the mechanical switch; the solid-state switch is firstly closed in the closing process of the circuit breaker;
And the control module is also used for controlling the solid-state switch to be turned off if the current change rate of the bus at the current moment is larger than the first preset threshold value or the current of the bus at the current moment is larger than the overload current in the switching-on process of the circuit breaker.
6. The control circuit of claim 5, wherein the control circuit comprises a logic circuit,
And the control module is further used for continuously controlling the mechanical switch to be closed if the current change rate of the bus at the current moment is smaller than the first preset threshold value and the current of the bus at the current moment is smaller than the overload current in the closing process of the circuit breaker.
7. The control circuit of any of claims 1-4, wherein the circuit breaker comprises a mechanical switch and a solid state switch in parallel with the mechanical switch;
The control module further comprises a mechanical control sub-module and a delay sub-module; wherein,
The mechanical control sub-module is used for controlling the mechanical switch to be turned off, and the delay sub-module is used for delaying a second preset time period after the mechanical switch is turned off to control the solid-state switch to be turned off.
8. The control circuit of claim 7, wherein the delay sub-module is configured to delay a second preset duration to control the solid state switch to turn off after the mechanical switch turns off, and specifically comprises:
the delay submodule is used for delaying the second preset duration to control the solid-state switch to be turned off when the current passing through the mechanical switch in the turn-off process of the mechanical switch is smaller than the preset reference current.
9. The control circuit of claim 5, wherein the mechanical switch is deactivated with the solid state switch in an off state.
10. A control method for a circuit breaker, characterized in that the method is applied to a control circuit according to any one of claims 1-9, the circuit breaker being connected in series on a bus bar of a power supply system, the control method comprising:
when the current change rate of the bus at the current moment is larger than a first preset threshold value, and the current change rate of the bus at the first moment is larger than the first preset threshold value and is locked for a first preset duration, determining that the power supply system is in a first state; wherein the first time is before the current time and is separated from the current time by a first preset time length;
When the power supply system is in the first state and the current of the bus at the current moment is larger than the safety current, the circuit breaker is controlled to be turned off;
When the current change rate of the bus at the current moment is smaller than the first preset threshold value and the current change rate of the bus at the first moment is smaller than the first preset threshold value, determining that the power supply system is in a third state;
When the power supply system is in the third state and the current of the bus at the current moment is larger than the overload current, the circuit breaker is controlled to be turned off; wherein the overload current is greater than the safety current.
11. The control method according to claim 10, characterized in that the control method further comprises:
The current change rate of the bus at the current moment is smaller than the first preset threshold value, and the current change rate of the bus at the first moment is larger than the first preset threshold value, so that the power supply system is determined to be in a second state;
And controlling the circuit breaker to be inactive when the power supply system is in the second state.
12. The control method according to claim 10, characterized in that the control method further comprises:
And under the condition that the power supply system is in the first state, if the current of the bus at the current moment is smaller than the safety current, controlling the circuit breaker to be not operated.
13. The control method according to claim 10, characterized in that the control method further comprises:
And controlling the circuit breaker to be not operated under the condition that the power supply system is in the third state and the current of the bus at the current moment is smaller than the overload current.
14. The control method according to any one of claims 10 to 13, wherein the circuit breaker comprises a mechanical switch and a solid state switch connected in parallel with the mechanical switch; the solid-state switch is firstly closed in the closing process of the circuit breaker;
before the determining that the power supply system is in the first state, the control method further includes:
and in the switching-on process of the circuit breaker, if the current change rate of the bus at the current moment is larger than the first preset threshold value or the current of the bus at the current moment is larger than the overload current, controlling the solid-state switch to be switched off.
15. The control method according to claim 14, characterized in that the control method further comprises:
And in the switching-on process of the circuit breaker, if the current change rate of the bus at the current moment is smaller than the first preset threshold value and the current of the bus at the current moment is smaller than the overload current, continuing to control the mechanical switch to be switched on.
16. The control method according to any one of claims 10 to 13, wherein the circuit breaker comprises a mechanical switch and a solid state switch connected in parallel with the mechanical switch;
The control of the circuit breaker to turn off specifically includes:
And controlling the mechanical switch to be turned off, and delaying a second preset time period after controlling the mechanical switch to be turned off to control the solid-state switch to be turned off.
17. The control method according to claim 16, wherein the delaying the control of the solid state switch to turn off for a second preset time period after the control of the mechanical switch to turn off specifically comprises:
acquiring current passing through the mechanical switch in the process of controlling the mechanical switch to be turned off;
And when the current passing through the mechanical switch is smaller than a preset reference current, delaying the second preset time period to control the solid-state switch to be turned off.
18. The control method according to claim 14, wherein the mechanical switch is not operated in a case where the solid state switch is in an off state.
19. An electronic device comprising a circuit breaker and a control circuit for a circuit breaker according to any of claims 1-9.
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| CN110932245A (en) * | 2019-12-06 | 2020-03-27 | 全球能源互联网研究院有限公司 | Hybrid direct current circuit breaker, control protection device and method |
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