Electric operation controller of circuit breaker

Abstract

The utility model discloses an electric operation controller of a circuit breaker. The electric operation controller comprises a processor, a command detection circuit, a closing drive circuit, an opening drive circuit and an over-current detection circuit, the processor is connected with the command detection circuit, the closing drive circuit, the opening drive circuit and the over-current detection circuit, receives an opening command and a closing command acquired by the command detection circuit and an electric operation loop current acquired by the over-current detection circuit, and outputs an opening signal and a closing signal; the opening driving circuit drives an opening motor to execute opening control according to the opening signal; and the closing driving circuit drives the closing electromagnet to execute closing control according to the closing signal. Based on over-current detection, the processor can realize locked-rotor state identification and control the relay to disconnect the motor in the locked-rotor state, so that the risk that the motor smokes and even is on fire due to locked-rotor can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to an electric operating controller of a circuit breaker. Background Art

[0002] The existing electric controller generally uses a thyristor to drive a relay, which controls the motor power supply. The electric controller has the following problems: 1. When the motor is stalled for a long time, the current is large and the heat is large, causing the motor to smoke or even catch fire; 2. The existing electric control circuit (referred to as the control power supply) and the motor power supply circuit (referred to as the electric control power supply) use the same circuit. When the motor is stalled, the current is large, the power supply is overloaded, and the control circuit loses power, causing the entire control system to crash; 3. The opening and closing control circuit is easily interfered with and causes malfunctions.

[0003] In addition, the electric control controller has the problem that the impact current of the closing electromagnet is too large, which causes the control relay contacts to stick, and then causes the closing electromagnet to be energized for a long time, resulting in smoke or fire. Utility Model Content

[0004] Therefore, in view of at least one of the above problems, the utility model provides an electric controller for a circuit breaker.

[0005] The utility model is implemented by the following scheme:

[0006] An electric controller for a circuit breaker comprises: a processor, a command detection circuit, a closing drive circuit, an opening drive circuit and an overcurrent detection circuit; wherein:

[0007] The command detection circuit is used to collect the opening and closing commands of the external device and send them to the processor;

[0008] The overcurrent detection circuit is used to detect the electric operating circuit current of the closing drive circuit and the opening drive circuit;

[0009] The processor is connected to the command detection circuit, the closing drive circuit, the opening drive circuit and the overcurrent detection circuit, receives the opening command, the closing command and the electric operation circuit current, and outputs the opening signal and the closing signal;

[0010] The opening drive circuit is used to drive the opening motor to perform opening control according to the opening signal;

[0011] The closing drive circuit is used to drive the closing electromagnet to perform closing control according to the closing signal.

[0012] Among them, in one embodiment, the electric control controller includes a separate control power supply +A and an electric control power supply +M; the control power supply +A outputs a first power supply directly or through a protection circuit to power the control circuit of the closing drive circuit and the control circuit of the opening drive circuit; the first power supply then outputs a second power supply to power the processor after DC step-down and voltage stabilization; the electric control power supply +M is used to power the electric control circuit of the closing drive circuit and the electric control circuit of the opening drive circuit.

[0013] Among them, in one embodiment, the overcurrent detection circuit includes a Hall current sensor U5; the Hall current sensor U5 is powered by a processor power supply; the sampling input terminal and the sampling output terminal of the Hall current sensor U5 are connected in series in the electric control circuit, and its sampling input terminal is connected to the negative pole of the electric control power supply of the opening drive circuit and the negative pole of the electric control power supply of the closing drive circuit; its sampling output terminal is connected to the negative pole of the electric control power supply; the output terminal of the Hall current sensor U5 outputs an overcurrent detection signal through an RC filter circuit and sends it to the processor.

[0014] In one embodiment, the opening drive circuit includes a relay K1 and a switch tube Q7; the opening signal controls the closing and closing of the relay K1 through the switch tube Q7; when the opening signal is input into the control end of the switch tube Q7, the switch tube Q7 is turned on, the relay K1 is closed, and the electric control circuit of the opening drive circuit is connected to the electric control power supply +M to be energized, thereby driving the opening motor to operate.

[0015] In one embodiment, the closing drive circuit includes a relay K2 and a switch tube Q9; the closing signal controls the closing and closing of the relay K2 through the switch tube Q9; when the closing signal is input, the switch tube Q9 is turned on, the relay K2 is closed, and the electric operating circuit of the closing drive circuit is connected to the electric operating power supply +M to be energized, driving the closing electromagnet to operate.

[0016] In one embodiment, the closing drive circuit further includes a delayed shutdown circuit for controlling the closing electromagnet to perform delayed shutdown after actuation.

[0017] Wherein, in one embodiment, the delayed shutdown circuit includes a diode D10, a voltage stabilizing circuit, a timing circuit and a power transistor Q12; the diode D10 and the power transistor Q12 are connected in series in the electric operating circuit of the closing electromagnet, the anode of the diode D10 is connected to the electric operating circuit power supply of the closing drive circuit, and the cathode of the diode D10 is connected to one end of the closing electromagnet; the other end of the closing electromagnet is connected to the first driving end of the power transistor Q12; the second driving end of the power transistor Q12 is connected to the negative electrode of the electric operating power supply of the closing drive circuit; the input end of the voltage stabilizing circuit is connected to the cathode of the diode D10, and the output end is connected to the timing circuit for powering the timing circuit; the output end of the voltage stabilizing circuit is also connected to the control end of the power transistor Q12 through a voltage divider bias circuit, so as to control the power transistor Q12 to turn on when the electric operating circuit of the closing drive circuit is powered on; the driving end of the timing circuit is connected to the control end of the power transistor Q12, and is used to ground the control end of the power transistor Q12 after a delay to turn off the power transistor Q12.

[0018] In one embodiment, the timing circuit includes resistors R45, R46, capacitor C18 and switch tube Q11, the output of the voltage stabilizing circuit is connected to the control end of the switch tube Q11 through the resistor R45, the control end of the switch tube Q11 is connected to the negative electrode of the electric power supply of the closing drive circuit through the parallel resistor R46 and capacitor C18, the first drive end of the switch tube Q11 is connected to the control end of the power transistor Q12, and the second drive end of the switch tube Q11 is connected to the negative electrode of the electric power supply of the closing drive circuit.

[0019] In one embodiment, it also includes an electrical operation state detection circuit; the electrical operation state detection circuit includes an energy storage state switch S8, including a first state pin, a second state pin and a common pin, the common pin of which is connected to the negative pole of the electrical operation power supply of the electrical operation controller, the first state pin of which is connected to the opening drive circuit, when the circuit breaker is closed, the first state pin of which is connected to the common pin, and the control loop of the opening drive circuit is in a working state, the second state pin of which is connected to the closing drive circuit, when the circuit breaker is opened, the second state pin of the energy storage state switch S8 is connected to the common pin, and the control loop of the closing drive circuit is in a working state.

[0020] In one embodiment, the electrical operation state detection circuit also includes a resistor R36, a voltage regulator tube ZD2 and a switch tube Q10; the second state pin of the energy storage state switch S8 is connected to the control end of the switch tube Q10 through the resistor; the first driving end of the switch tube Q10 is connected to the processor power supply through the resistor, and outputs an energy storage state detection signal to the processor; the second driving end of the switch tube Q10 is connected to the negative electrode of the control power supply of the electrical operation controller; the resistor R36 and the voltage regulator tube ZD2 constitute a voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected to the control end of the switch tube Q10, and a voltage bias is provided for the control end of the switch tube Q10, so that the switch tube Q10 is turned on when the second state pin of the energy storage state switch S8 is suspended.

[0021] Among them, in one embodiment, the electric controller also includes a remote / local state detection circuit; the remote / local state detection circuit includes an optocoupler U3 and a remote / local switch S6; includes a first state pin, a second state pin and a common pin, and its first state pin is connected to the opening drive circuit and the closing drive circuit; its common pin is connected to the first power supply; the positive pole of the transmitting end of the optocoupler U3 is connected to the second state pin of the remote / local switch S6 through a resistor, the negative pole of the transmitting end of the optocoupler U3 is connected to the negative pole of the control power supply, and the receiving end C pole and the receiving end E pole of the optocoupler U3 are open-circuited output; when the first state pin is connected to the common pin, the control power supply of the opening drive circuit and the control circuit of the closing drive circuit are energized; when the second state pin is connected to the common pin, the control circuit of the opening drive circuit and the control circuit of the closing drive circuit are powered on, and at the same time, the receiving end of the optocoupler U3 is turned on.

[0022] Among them, in one embodiment, it also includes a power-off detection circuit, which includes an optocoupler U4; the positive pole of the transmitting end of the optocoupler U4 is connected to the electric control circuit power supply of the opening drive circuit and the electric control circuit power supply of the closing drive circuit through a resistor, and is connected to the negative pole of the electric control power supply through a resistor, and the negative pole of the transmitting end of the optocoupler U4 is connected to the negative pole of the electric control power supply; the receiving end C pole of the optocoupler U4 is connected to the processor power supply through a resistor, and sends a power-off detection signal to the processor; the receiving end E pole of the optocoupler U4 is connected to the negative pole of the control power supply.

[0023] Wherein, in one embodiment, the electric operation controller further includes a circuit breaker state detection circuit, including a closing state detection circuit and a tripping state detection circuit;

[0024] The closing state detection circuit includes a voltage-dividing filter circuit and a transistor Q1; the introduced closing state signal is connected to the base of the transistor Q1 via the voltage-dividing filter circuit, and the emitter of the transistor Q1 is connected to the negative electrode of the control power supply; the collector of the transistor Q1 is connected to the processor power supply through a resistor, and outputs the closing state detection signal to the processor;

[0025] The tripping state detection circuit includes a voltage-dividing filter circuit and a transistor Q2; the introduced tripping state signal is connected to the base of the transistor Q2 via the voltage-dividing filter circuit, and the emitter of the transistor Q2 is connected to the negative electrode of the control power supply; the collector of the transistor Q2 is connected to the processor power supply through a resistor, and outputs a closing state detection signal to the processor.

[0026] The technical solution provided by the utility model has the following technical effects:

[0027] 1. By detecting the current of the electric control circuit, the motor stall state can be identified, and the control relay can be used to disconnect the motor in the stall state, which can effectively solve the risk of motor stalling, smoking, or even fire;

[0028] 2. By isolating the control power supply from the electrical power supply, the system crash can be effectively prevented;

[0029] 3. By adding a delayed disconnection circuit and disconnecting the closing electromagnet in time, it can effectively prevent the relay from sticking and causing the electromagnet to smoke or even catch fire, thereby improving the reliability and safety of the product;

[0030] 4. By detecting the electric power supply, the electric power supply in abnormal state can be identified and disconnected, which can effectively avoid the risk of repeated startup of the switch power supply due to overload, resulting in remote inability to control the electric operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a system block diagram of an electric control controller of the utility model;

[0032] Figure 2 It is a circuit principle diagram of the DC step-down voltage stabilizing circuit of the electric control controller of the utility model;

[0033] Figure 3 It is a circuit principle diagram of the remote / local state detection circuit of the electric controller of the utility model;

[0034] Figure 4 It is a circuit principle diagram of the electric operation state detection circuit, the opening drive circuit and the closing drive circuit of the electric operation controller of the utility model;

[0035] Figure 5 It is a circuit principle diagram of the auxiliary switch input circuit of the electric controller of the utility model;

[0036] Figure 6 It is a circuit principle diagram of the power-off detection circuit of the electric control controller of the utility model;

[0037] Figure 7 It is a circuit principle diagram of the overcurrent detection circuit of the electric controller of the utility model;

[0038] Figure 8 It is a circuit principle diagram of the circuit breaker state detection circuit of the electric operation controller of the utility model;

[0039] Fig. 9 It is a circuit principle diagram of the command detection circuit of the electric control controller of the utility model;

[0040] Fig.10 The utility model is a circuit diagram of a processor circuit of an electric control controller. DETAILED DESCRIPTION

[0041] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0042] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figure 1 As shown, the utility model provides an embodiment of an electric control controller for a circuit breaker, including a 32-bit processor, a DC step-down voltage stabilizing circuit, an auxiliary switch input circuit, a remote / local state detection circuit, a circuit breaker state detection circuit, a command detection circuit, a power-off detection circuit, an overcurrent detection circuit, a closing drive circuit, an opening drive circuit and other functional modules, which can analyze the opening / closing / tripping of the circuit breaker in real time, detect the remote opening and closing control commands in real time and effectively filter out interference signals; detect the circuit breaker and the electric control state in real time during the control process to realize a closed control loop; detect the voltage and current in real time during the control process, disconnect the electric control power supply in an abnormal state, and realize the protection of the electric control motor and the electromagnet. The processor controls the output of the opening signal and the closing signal according to the electric control loop current collected by the overcurrent detection circuit, which can be realized by conventional technical means such as a single limit comparison method and an inverse time overcurrent protection algorithm. This part is not the focus of the utility model and will not be described in detail here.

[0044] The circuit description of each module is as follows:

[0045] This electric control controller uses a separate control power supply +A and electric control power supply +M. The control power supply +A outputs 24V power supply after passing through the DC step-down voltage stabilization circuit, and the power supply DVDD supplies power to the processor, the electric control status detection circuit, the control circuit of the closing drive circuit, and the control circuit of the opening drive circuit; the electric control power supply +M is used to supply power to the electric control circuit of the closing drive circuit and the electric control circuit of the opening drive circuit. -A represents the negative pole of the control power supply; -M represents the negative pole of the electric control power supply. The closing and opening control circuit and the closing and opening drive circuit (electric control power supply) of this electric control controller use power supplies from different circuits, which can effectively prevent the risk of the entire control system collapsing due to large current when the motor is blocked, power overload protection, and power failure of the control circuit.

[0046] like Figure 2 As shown, the DC step-down voltage stabilizing circuit is used to power the opening and closing control circuit, including temperature fuses PT1, PT2, transient voltage suppression tube TV1, diode D1, capacitors C1, C2, C3, C4, E1, resistor R1 and power management chip U1, etc. The control power supply +A outputs the power supply +A0 through PT2 to power the switch in the auxiliary alarm attachment of the circuit breaker; and outputs the power supply 24V to power the control circuit of each drive circuit after passing through the protection circuit composed of PT1, TV1 and D1. The power supply 24V then outputs the power supply DVDD through the power management chip U1 to power the processor.

[0047] like Figure 3As shown, in order to be suitable for remote control and local control operations, the electric controller is also provided with a remote / local switch S6 and a remote / local state detection circuit, wherein the remote / local switch S6 is a micro switch, and the state switching is controlled by a mechanical switch; the remote / local state detection circuit is composed of connector JP3, resistors R11, R12, optocoupler U3, connector JP4, etc. The three terminals of JP3 are respectively connected to the normally open pin, normally closed pin and common pin of the remote / local switch S6, which are used to set the electric controller to the local / manual state or the remote automatic / state. The normally open pin of S6 is connected to the power supply 24V0 through JP3, and the normally closed pin is connected to the control end of the resistor R11 and the optocoupler U3 through JP3; the common pin is connected to the power supply 24V through JP3. When the normally closed pin and the common pin of S6 are short-circuited, the electric controller is set to the local / manual state, the optocoupler U3 is powered on and the output is open-circuited through JP4; when the normally open pin and the common pin of S6 are short-circuited, the electric controller is set to the remote / automatic state, at this time, the power supply 24V supplies power to the power supply 24V0 (the power supply 24V0 represents the control circuit power supply of the opening drive circuit and the control circuit power supply of the closing drive circuit), the electric state detection circuit, the control circuit of the opening drive circuit and the control circuit of the closing drive circuit are powered on, and the energy storage state detection and opening and closing operations can be performed. This electric controller uses a mechanical switch for physical electrical isolation of remote / local control to prevent remote misoperation when the electric operator handles the local state.

[0048] like Figure 4 As shown, in order to effectively remotely control the opening and closing mechanism of the circuit breaker, the electric controller is provided with an opening drive circuit, a closing drive circuit, an energy storage state switch and an electric operation state detection circuit. Among them:

[0049] The opening drive circuit is composed of relay K1, resistors R33, R34, transistor Q7, diodes D7, D8 and terminal JP6. Resistors R33, R34 and transistor Q7 form a relay drive circuit to drive relay K1, and the electric power supply +M1 is the electric power supply of the opening drive circuit. When Q7 is turned on, relay K1 is energized, the electric power supply +M1 and the power supply +M are turned on, the opening motor is powered on, and the motor drives the mechanism to complete the opening energy storage. When Q7 is turned off, relay K1 is turned off, the opening motor loses power, and the opening action ends.

[0050] When executing the opening control, the energy storage state switch S8 is in the closing / energy storage state, that is, the normally closed pin and the common pin of S8 are short-circuited, and the emitter of Q7 is connected to the negative pole of the control power supply -A through the energy storage state switch S8. This state indicates that the circuit breaker is currently in the closing state, allowing the opening control to be executed.

[0051] The specific circuit connection is as follows:

[0052] Q7 is an NPN transistor; the two ends of the coil of relay K1 are connected to the power supply 24V0 and the collector of Q7 respectively; the switch of relay K1 is connected to the power supply +M and the motor power supply +M1 respectively; the control signal OPEN_CTL is connected to the base of Q7 after being divided by resistors R33 and R34; the emitter of Q7 is connected to the control loop virtual ground OP_-A of the opening gate drive circuit, and the control loop virtual ground OP_-A is connected to the normally closed pin CSW_NC of the energy storage state switch S8.

[0053] D7 and D8 are preferred settings. D7 and D8 are respectively connected in parallel with the relay coil and the motor to provide a back electromotive force discharge path.

[0054] like Figure 4As shown, the electrical operation state detection circuit is composed of resistors R36, R41, R42, R43, voltage regulator ZD2, transistor Q10, plug-in terminal JP7 and energy storage state switch S8. Plug-in terminal JP7 is used to connect to the energy storage state switch S8. The energy storage state switch S8 is a micro switch used to detect the electrical operation state of the circuit breaker and switch between the opening state and the closing state. The normally open pin CSW_NO of the energy storage state switch S8 is connected to the virtual ground CL_A of the control circuit of the closing drive circuit, the normally closed pin CSW_NC is connected to the virtual ground OP_A of the control circuit of the opening drive circuit, and the common pin CSW_COM is connected to the negative electrode GND of the control power supply. Resistors R36, R41, R42, R43, voltage regulator ZD2, transistor Q10 and other devices constitute the state detection circuit of the energy storage state switch S8, and detect the voltage of CL_-A. When the electric operator is in the closing state, the energy storage state switch S8 is cut to the control circuit of the opening drive circuit (the normally closed pin of the energy storage state switch S8 is connected to the common pin), and CL_-A is suspended and pulled up to 24V by R36; after conversion by the state detection circuit, Q10 outputs a low level, indicating that the electric operator completes the closing action (energy release); conversely, when the electric operator is in the opening state, the energy storage state switch S8 is cut to the control circuit of the closing drive circuit (the normally open pin of the energy storage state switch S8 is connected to the common pin), and CL_-A is cut to GND, and Q10 outputs a high level, indicating that the electric operator completes the opening action (energy storage). The specific circuit connection relationship is: R36, R42, R43 and ZD2 constitute the base bias voltage of Q10: CL_-A is connected to the power supply 24V0 through resistor R36, connected to the negative pole of the control power supply -A through ZD2, and connected to the base of Q10 through resistor R42. The base of Q10 is connected to the negative pole of the control power supply -A through resistor R43; the collector of Q10 is connected to the power supply DVDD through resistor R41, and the electrical operation status detection signal CHARGED_DET is output at the same time. This electrical operation status detection circuit uses a physical switch to switch the isolation command to execute repeatedly. When executing the opening / closing action, the controller will detect the state of the electrical operation in real time. The opening command can only be executed when it is in the closing state, and vice versa, the closing command can only be executed when it is in the opening state.

[0055] like Figure 4 As shown, the closing drive circuit includes resistors R37, R38, transistor Q9, relay K2, diode D9 and a delayed shutdown circuit. When receiving the closing signal, Q9 is turned on, controlling the relay K2 to attract, connecting the electric power supply +M2 and the power supply +M, supplying power to the closing electromagnet, and the closing electromagnet is actuated.

[0056] The time-delay shutdown circuit is composed of resistors R44, R45, R46, R47, R48, capacitor C18, voltage regulator ZD1, diodes D10, D11, transistor Q11, power MOS tube Q12, connector JP6, etc. Among them, connector JP6 is used to connect the closing electromagnet; R44 and ZD1 form a voltage regulator circuit, R45, R46 and C18, Q11 form a timing circuit, and diodes D10 and Q12 are connected in series in the driving circuit of the closing electromagnet. The specific circuit connection relationship is: the anode of D10 is connected to the electric power supply +M2, the cathode of D10 is connected to one end of the closing electromagnet; the other end of the closing electromagnet is connected to the D pole of Q12; the S pole of 12 is connected to the negative pole of the power supply -M0 of the electric power circuit of the closing drive circuit; the output end of the voltage regulator circuit is also connected to the control end of Q12 through a voltage divider bias circuit composed of R47 and R48, so as to control Q12 to turn on when the electric power supply +M2 is powered on. The input end of the voltage regulator circuit is connected to the cathode of the diode D10, and the output end is connected to the timing circuit to form a relatively stable reference power supply to supply power to the timing circuit; in the timing circuit, the output of the voltage regulator circuit is connected to the base of Q11 through the resistor R45, the control end of Q11 is connected to the negative pole of the power supply -M0 through the parallel resistor R46 and capacitor C18, the emitter of Q11 is connected to the G pole of Q12, and the collector of Q11 is connected to the negative pole of the power supply -M0 of the electric power circuit of the closing drive circuit. The driving end of the timing circuit is connected to the control end of Q12, and after the timing of the timing circuit ends, the control end of Q12 is pulled down to turn off Q12. In this embodiment, Q11 is an NPN transistor, which can provide a base voltage of 0.7V as a switch reference. The voltage stabilizing circuit supplies power to the timing circuit to accurately control the timing duration of the timing circuit, that is, the working duration of the closing electromagnet; so that after the closing drive circuit is powered on for a period of time, the base voltage of Q11 rises to 0.7V, and Q11 is turned on. Q11 controls the on and off of Q12. When Q11 is in the off state, Q12 is in the on state through the voltage bias of R47 and R48, and the electromagnet performs the closing action; when Q11 is in the on state, Q12 is in the off state, and the power is cut off after the electromagnet completes the closing action. Adding a delayed disconnection circuit to the closing drive circuit can prevent the risk of smoke or fire caused by the closing electromagnet being powered on for a long time due to the excessive impact current of the closing electromagnet and the long power-on time, which may cause the relay K2 contacts to stick.

[0057] like Figure 5As shown, the external interface of the electric controller includes connectors JP1 and JP2. Among them, JP1 is used to connect with the remote closing switch S1 and the remote opening switch S2, input the opening command OP_CMD_IN and the closing command CL_CMD_IN, and JP1 is also used to connect the electric power supply +M, the negative pole of the electric power supply -M, the control power supply +A, and the negative pole of the control power supply -A. The control power supply +A is isolated from the electric power supply +M to prevent the system from crashing. JP2 is used to connect with the auxiliary alarm accessories of the circuit breaker, and the circuit breaker auxiliary alarm switches S3 and S4 introduce electric operation to detect the circuit breaker status. When the circuit breaker is in the closed state, S3 is turned on; when it is in the tripped state, S4 is turned on. The electric controller is provided with a circuit breaker status detection circuit, which is composed of S3 and Q1 related devices to form a closing state detection circuit; and the opening state detection circuit is composed of S4 and Q2 related devices. When closing is completed, S3 is turned on and the collector of Q1 outputs a low level; when tripping, S4 is turned on and the collector of Q2 outputs a low level; the opening state is the energy storage state, which is completed by the above-mentioned electrical operation state detection circuit.

[0058] like Figure 6 As shown, in order to detect the electric power supply and release the control command in time, disconnect the electric power supply in an abnormal state, which can effectively avoid the risk of repeated startup of the switch power supply due to overload, resulting in the remote inability to control the electric operation, and a power failure detection circuit is also provided, wherein the power failure detection circuit is composed of resistors R13A, R13B, R13C, R14 and optocoupler U4 and other devices, which convert the 24V electric power supply into high and low levels that the processor can recognize. When the processor detects an overload power failure, it releases the command and waits for the execution of the next command. Power failure detection can disconnect the electric power supply in an abnormal state, preventing the problem of repeated opening and closing after power overload protection, repeated overload, and uncontrollable when the electric operations of multiple circuit breakers are operated simultaneously. The specific circuit connection relationship is: the positive pole of the transmitting end of the optocoupler U4 is connected to the electric power supply +M1 of the opening drive circuit and the electric power supply +M2 of the closing drive circuit through resistors R13A and R13B respectively, and is connected to the negative pole of the electric power supply -M0 through resistor R13C, and the negative pole of the transmitting end of the optocoupler U4 is connected to the negative pole of the electric power supply -M0; the receiving end C pole of the optocoupler U4 is connected to the power supply DVDD through resistor R14, and sends a power-off detection signal to the processor U2; the receiving end E pole of the optocoupler U4 is grounded. When any power supply of the electric power supply +M1 or the electric power supply +M2 is powered, U4 is powered on, and VOL_DET outputs a low-level signal; when both the electric power supply +M1 and the electric power supply +M2 are powered off, U4 loses power and shuts down, and VOL_DET outputs a high-level signal, sending a power-off alarm. In this embodiment, the electric control power supply +M1 and the electric control power supply +M2 are connected to the electric control power supply +M in time sharing. Therefore, this power failure detection circuit uses one optical coupler to perform power failure detection on the electric control power supply +M1 and the electric control power supply +M2 respectively, saving hardware overhead.

[0059] like Figure 7 As shown, the overcurrent detection circuit is composed of a Hall current sensor U5, a resistor R24, and capacitors C23, C24 and other devices. The processor collects the driving current in the process of executing the opening command and the closing command in real time, and quickly disconnects the opening and closing relays and disconnects the electric power supply through the current inverse time algorithm and other algorithms. In this embodiment, the Hall current sensor U5 adopts a chip package, the model is SDC1600, powered by the power supply DVDD, and has a built-in sampling resistor. The specific circuit connection relationship is: the sampling input terminal IP+ and the sampling output terminal IP- of the Hall current sensor U5 are respectively connected to the negative pole of the electric power supply -M0 and the negative pole of the electric power supply -M; the output terminal VOUT of the Hall current sensor U5 outputs the overcurrent detection signal CS_AD through the RC filter circuit composed of R24 and C24, and sends it to the processor U2. In this embodiment, the Hall current sensor U5 also has a filter input terminal FILTTER, and the filter input terminal FILTER is connected to the negative pole of the control power supply -A through the capacitor C23. The Hall current sensor provides small-sized, isolated current detection. It uses the control circuit power supply to detect the drive current of the electric control circuit, meeting the isolation requirements of the control power supply and the electric control power supply. By adding current detection and combining the algorithm processing of the processor, the control relay disconnects the motor in the stalled state, which can effectively solve the problem of motor stalling, smoking, or even fire.

[0060] like Figure 8 and Fig. 9 As shown, this embodiment includes multiple state detection circuits such as a circuit breaker state detection circuit and a command detection circuit. These state detection circuits have the same or similar circuit structure, and are used to convert the 24V state signal into high and low levels that can be recognized by the processor U2. For example, the opening command detection circuit includes resistors R25, R26, R27, capacitor C14, transient voltage suppression tube TV6 and transistor Q4, etc., which convert the remote 24V control command into high and low level signals that can be recognized by the processor. The specific circuit connection relationship is: the opening command OP_CMD_IN is connected to the base of the transistor Q4 through the resistor R25; the base of the transistor Q1 is grounded through the parallel R26, C14 and TV6; the collector of the transistor Q4 is pulled up to the power supply DVDD through the resistor R27 to output the opening command detection signal OPEN_CMD_DET. Input the opening command OP_CMD_IN and output the signal OPEN_CMD_DET. When the opening command OP_CMD_IN is a high-level signal, Q4 is turned on and the signal OPEN_CMD_DET outputs a low-level signal; otherwise, Q4 is turned off and the signal OPEN_CMD_DET outputs a high-level signal. R25, R26 and C14 form a resistor divider circuit and an RC filter circuit for threshold determination and interference filtering.

[0061] This electric controller uses a processor for control. It will detect control commands such as the opening command OP_CMD_IN, the closing command OP_CMD_IN, and the circuit breaker states such as the closing state, the opening state, and the tripping state, and perform corresponding actions based on the detection results. This operation mode can effectively filter out invalid control commands.

[0062] like Fig.10 As shown, the processor U2 uses a 32-bit processor, which can provide powerful processing capabilities. The processor U2 is connected to each functional module to filter out invalid control commands; by increasing current detection and algorithm processing, the control relay disconnects the motor in a blocked state, which can effectively solve the problem of motor blocking, smoking, or even fire; by detecting the electric power supply and releasing the control command in time, disconnecting the electric power supply in an abnormal state, it can effectively avoid overload causing repeated startup of the switch power supply, resulting in remote inability to control the electric operation.

[0063] The electric controller of the utility model has the following advantages:

[0064] 1. By detecting the current of the electric control circuit, the motor stall state can be identified, and the control relay can be used to disconnect the motor in the stall state, which can effectively solve the problem of motor stalling, smoking, or even fire;

[0065] 2. By isolating the control power supply from the electrical power supply, the system crash can be effectively prevented;

[0066] 3. By adding a delayed disconnection circuit, the electromagnet can be disconnected in time to prevent the relay from sticking and causing the electromagnet to smoke or even catch fire, which can effectively improve the reliability and safety of the product;

[0067] 4. By detecting the electric power supply, the electric power supply in abnormal state can be identified and disconnected, which can effectively avoid the risk of repeated startup of the switch power supply due to overload, resulting in remote inability to control the electric operation.

[0068] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An electric controller for a circuit breaker, characterized in that: include: Processor, command detection circuit, closing drive circuit, opening drive circuit and overcurrent detection circuit; wherein: The command detection circuit is used to collect the opening and closing commands of the external device and send them to the processor; The overcurrent detection circuit is used to detect the electric operating circuit current of the closing drive circuit and the opening drive circuit; The processor is connected to the command detection circuit, the closing drive circuit, the opening drive circuit and the overcurrent detection circuit, receives the opening command, the closing command and the electric operation circuit current, and outputs the opening signal and the closing signal; The opening drive circuit is used to drive the opening motor to perform opening control according to the opening signal; The closing drive circuit is used to drive the closing electromagnet to perform closing control according to the closing signal.

2. The electric controller of the circuit breaker according to claim 1, characterized in that: The electric control controller includes a separate control power supply +A and an electric control power supply +M; the control power supply +A outputs a first power supply directly or through a protection circuit to power the control circuit of the closing drive circuit and the control circuit of the opening drive circuit; the first power supply then outputs a second power supply to power the processor after DC step-down and voltage stabilization; the electric control power supply +M is used to power the electric control circuit of the closing drive circuit and the electric control circuit of the opening drive circuit.

3. The electric controller of the circuit breaker according to claim 2, characterized in that: The overcurrent detection circuit includes a Hall current sensor U5; the Hall current sensor U5 is powered by a processor power supply; the sampling input and sampling output of the Hall current sensor U5 are connected in series in the electric control circuit, and its sampling input is connected to the negative pole of the electric control power supply of the opening drive circuit and the negative pole of the electric control power supply of the closing drive circuit; its sampling output is connected to the negative pole of the electric control power supply; the output of the Hall current sensor U5 outputs an overcurrent detection signal through an RC filter circuit and sends it to the processor.

4. The electric controller of the circuit breaker according to claim 2, characterized in that: The opening drive circuit includes a relay K1 and a switch tube Q7; the opening signal controls the closing and closing of the relay K1 through the switch tube Q7; when the opening signal is input to the control end of the switch tube Q7, the switch tube Q7 is turned on, the relay K1 is closed, and the electric control circuit of the opening drive circuit is connected to the electric control power supply +M to energize, driving the opening motor to operate.

5. The electric controller of the circuit breaker according to claim 2, characterized in that: The closing drive circuit includes a relay K2 and a switch tube Q9; the closing signal controls the closing and closing of the relay K2 through the switch tube Q9; when the closing signal is input, the switch tube Q9 is turned on, the relay K2 is closed, the electric operating circuit of the closing drive circuit and the electric operating power supply +M are connected to energize, and the closing electromagnet is driven to operate.

6. The electric controller of the circuit breaker according to claim 5, characterized in that: The closing drive circuit also includes a delayed shutdown circuit, which is used to control the closing electromagnet to perform delayed shutdown after actuation.

7. The electric controller of the circuit breaker according to claim 6, characterized in that: The delayed shutdown circuit includes a diode D10, a voltage stabilizing circuit, a timing circuit and a power transistor Q12; the diode D10 and the power transistor Q12 are connected in series in the electric operating circuit of the closing electromagnet, the anode of the diode D10 is connected to the electric operating circuit power supply of the closing drive circuit, and the cathode of the diode D10 is connected to one end of the closing electromagnet; the other end of the closing electromagnet is connected to the first driving end of the power transistor Q12; the second driving end of the power transistor Q12 is connected to the negative electrode of the electric operating power supply of the closing drive circuit; the input end of the voltage stabilizing circuit is connected to the cathode of the diode D10, and the output end is connected to the timing circuit for powering the timing circuit; the output end of the voltage stabilizing circuit is also connected to the control end of the power transistor Q12 through a voltage divider bias circuit, so as to control the power transistor Q12 to be turned on when the electric operating circuit of the closing drive circuit is powered on; the driving end of the timing circuit is connected to the control end of the power transistor Q12, and is used to ground the control end of the power transistor Q12 after a delay to turn off the power transistor Q12.

8. The electric controller of the circuit breaker according to claim 7, characterized in that: The timing circuit includes resistors R45, R46, capacitor C18 and switch tube Q11. The output of the voltage stabilizing circuit is connected to the control end of the switch tube Q11 through the resistor R45. The control end of the switch tube Q11 is connected to the negative electrode of the electric power supply of the closing drive circuit through the parallel resistor R46 and capacitor C18. The first drive end of the switch tube Q11 is connected to the control end of the power transistor Q12, and the second drive end of the switch tube Q11 is connected to the negative electrode of the electric power supply of the closing drive circuit.

9. The electric controller of the circuit breaker according to claim 2, characterized in that: It also includes an electrical operation state detection circuit; the electrical operation state detection circuit includes an energy storage state switch S8, including a first state pin, a second state pin and a common pin, the common pin of which is connected to the negative pole of the electrical operation power supply of the electrical operation controller, the first state pin of which is connected to the opening drive circuit, when the circuit breaker is closed, the first state pin of which is connected to the common pin, and the control loop of the opening drive circuit is in a working state, the second state pin of which is connected to the closing drive circuit, when the circuit breaker is opened, the second state pin of the energy storage state switch S8 is connected to the common pin, and the control loop of the closing drive circuit is in a working state.

10. The electric controller of the circuit breaker according to claim 9, characterized in that: The electric operation state detection circuit also includes a resistor R36, a voltage regulator tube ZD2 and a switch tube Q10; the second state pin of the energy storage state switch S8 is connected to the control end of the switch tube Q10 through the resistor; the first drive end of the switch tube Q10 is connected to the processor power supply through the resistor, and outputs an energy storage state detection signal to the processor; the second drive end of the switch tube Q10 is connected to the negative electrode of the control power supply of the electric operation controller; the resistor R36 and the voltage regulator tube ZD2 constitute a voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected to the control end of the switch tube Q10, and a voltage bias is provided for the control end of the switch tube Q10, so that the switch tube Q10 is turned on when the second state pin of the energy storage state switch S8 is suspended.

11. The electric controller of the circuit breaker according to claim 2, characterized in that: It also includes a remote / local state detection circuit; the remote / local state detection circuit includes an optical coupler U3 and a remote / local switch S6; It includes a first state pin, a second state pin and a common pin, wherein the first state pin is connected to the opening drive circuit and the closing drive circuit; the common pin is connected to a first power supply; the positive pole of the transmitting end of the optocoupler U3 is connected to the second state pin of the remote / local switch S6 through a resistor, the negative pole of the transmitting end of the optocoupler U3 is connected to the negative pole of the control power supply, and the receiving end C pole and the receiving end E pole of the optocoupler U3 are open-circuited outputs; when the first state pin is connected to the common pin, the control power supply of the opening drive circuit and the control circuit of the closing drive circuit are powered; when the second state pin is connected to the common pin, the control circuit of the opening drive circuit and the control circuit of the closing drive circuit are powered off, and at the same time, the receiving end of the optocoupler U3 is turned on.

12. The electric controller of the circuit breaker according to claim 2, characterized in that: It also includes a power-off detection circuit, which includes an optocoupler U4; the positive pole of the transmitting end of the optocoupler U4 is connected to the electric control circuit power supply of the opening drive circuit and the electric control circuit power supply of the closing drive circuit through a resistor, and is connected to the negative pole of the electric control power supply through a resistor, and the negative pole of the transmitting end of the optocoupler U4 is connected to the negative pole of the electric control power supply; the receiving end C pole of the optocoupler U4 is connected to the processor power supply through a resistor, and a power-off detection signal is sent to the processor; the receiving end E pole of the optocoupler U4 is connected to the negative pole of the control power supply.

13. The electric controller of the circuit breaker according to claim 2, characterized in that: It also includes a circuit breaker state detection circuit, including a closing state detection circuit and a tripping state detection circuit; The closing state detection circuit includes a voltage-dividing filter circuit and a transistor Q1; the introduced closing state signal is connected to the base of the transistor Q1 via the voltage-dividing filter circuit, and the emitter of the transistor Q1 is connected to the negative electrode of the control power supply; the collector of the transistor Q1 is connected to the processor power supply through a resistor, and outputs the closing state detection signal to the processor; The tripping state detection circuit includes a voltage-dividing filter circuit and a transistor Q2; the introduced tripping state signal is connected to the base of the transistor Q2 via the voltage-dividing filter circuit, and the emitter of the transistor Q2 is connected to the negative electrode of the control power supply; the collector of the transistor Q2 is connected to the processor power supply through a resistor, and outputs a closing state detection signal to the processor.

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