Circuit breaker starting system and circuit breaker

Abstract

The utility model provides a circuit breaker starting system and a circuit breaker, and belongs to the technical field of circuit breakers, and the circuit breaker starting system comprises a detection circuit, a power-on starting circuit, a drive circuit and a relay. The detection circuit generates a power-on signal based on an AC signal output by an AC source. The power-on starting circuit is connected with the detection circuit, and responds to the power-on signal to generate a first starting signal lasting for a preset duration; the driving circuit is connected with the power-on starting circuit, and responds to the first starting signal to generate a driving signal group in a first state; the relay responds to the driving signal set in the first state to control the contact end to be attracted. Therefore, the relay is controlled to be closed at the moment when the alternating current source is powered on every time, so that the alternating current source supplies power to the rear-end load to trigger the auxiliary power supply circuit of the circuit breaker to supply power, and the problem that the relay cannot be powered on after being disconnected under the abnormal conditions of collision, vibration and the like in the production or transportation process is solved; therefore, the dead halt state of the circuit breaker caused by power failure is eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and particularly relates to a circuit breaker starting system and a circuit breaker. Background Art

[0002] With the intelligent development of circuit breakers, circuit breakers already have wireless communication functions, and circuit breakers with wireless communication functions have been widely used in intelligent meters. Taking the application on an intelligent electricity meter as an example, using a circuit breaker can not only monitor parameters such as the current and voltage of the electricity meter in real time, but also users can remotely view the electricity meter data and control the switch state of the circuit breaker through a terminal device, realizing intelligent and convenient management of electricity use.

[0003] Currently, the wireless communication function of a circuit breaker is usually realized by setting a communication component (such as Bluetooth, etc.) and a controller in the circuit breaker. In order to prevent the circuit breaker from consuming alternating current passing through the electricity meter, a battery and a magnetic latching relay are also set in the circuit breaker. First, alternating current supplies power to the controller through the normally closed magnetic latching relay, and the controller controls to turn on the battery power supply mode and at the same time controls the magnetic latching relay to disconnect to cut off the alternating current power supply, so that alternating current is not consumed during the operation of the circuit breaker.

[0004] However, in actual use, the magnetic latching relay may be subject to external strong collisions or vibrations during production or transportation, causing the normally closed magnetic latching relay to malfunction and accidentally disconnect. At this time, when alternating current is powered on again, power cannot be supplied to the controller through the magnetic latching relay, so that the controller cannot start the battery power supply mode, that is, neither alternating current nor the battery can supply power, resulting in the circuit breaker being in a dead state. Therefore, how to prevent the circuit breaker from being unable to supply power and resulting in a dead state is an urgent problem to be solved at present. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present application provides a circuit breaker starting system and a circuit breaker.

[0006] In a first aspect, a circuit breaker starting system provided by the present application includes:

[0007] A detection circuit, connected to an AC source, generating a power-on signal based on an AC signal output by the AC source;

[0008] A power-on starting circuit, connected to the detection circuit and an auxiliary power supply circuit, generating a first starting signal that lasts for a preset duration according to the output of the auxiliary power supply circuit and the power-on signal;

[0009] A relay, connected to the AC source;

[0010] The drive circuit is connected to the power-on startup circuit and the relay, and controls the relay to close in response to the first startup signal, so that the AC source supplies power to the circuit breaker.

[0011] Optionally, the circuit breaker startup system further includes a controller;

[0012] The controller includes a power supply terminal connected to the relay and the auxiliary power supply circuit, a detection terminal connected to the detection circuit, and an output terminal connected to the drive circuit;

[0013] The controller responds to the power-on signal input at the detection terminal, outputs a second startup signal after the preset duration through the output terminal, and controls the auxiliary power supply circuit to supply power to the circuit breaker;

[0014] The drive circuit responds to the second startup signal and controls the relay to open, so as to cut off the power supply from the AC source to the circuit breaker.

[0015] Optionally, the detection circuit is further configured to generate a power-off signal when the AC source is disconnected;

[0016] The controller also responds to the power-off signal input at the detection terminal, controls the auxiliary power supply circuit to stop supplying power, and outputs the first startup signal through the output terminal;

[0017] The drive circuit responds to the first startup signal to control the contact terminal of the relay to close.

[0018] Optionally, the relay includes a coil terminal connected to the drive circuit and a contact terminal connected to the controller and the AC source;

[0019] The drive circuit generates a first-state drive signal group in response to the first startup signal, and generates a second-state drive signal group in response to the second startup signal;

[0020] The coil terminal of the relay is connected to the first-state drive signal group to drive the contact terminal to close; the coil terminal of the relay is connected to the second-state drive signal group to drive the contact terminal to open.

[0021] Optionally, the detection circuit includes a first diode and a first resistor;

[0022] The first diode includes an anode connected to the live wire terminal of the AC source and a cathode connected to the first resistor;

[0023] The first resistor includes a first end connected to the cathode of the first diode and a second end connected to the power-on startup circuit.

[0024] Optionally, the power-on startup circuit includes a first switching transistor and a first capacitor;

[0025] The first switching transistor includes a control electrode connected to the detection circuit, a first electrode connected to the auxiliary power supply circuit, and a second electrode connected to the first capacitor;

[0026] The first capacitor includes a first end connected to the second electrode of the first switching transistor and a second end connected to the drive circuit.

[0027] Optionally, the power-on startup circuit further includes a second diode; the second diode includes a cathode connected to the second end of the first capacitor and an anode grounded.

[0028] Optionally, the drive circuit includes a first drive sub-circuit and a second drive sub-circuit;

[0029] The output terminal of the controller includes a first output terminal for outputting the first startup signal and a second output terminal for outputting a second startup signal;

[0030] The first drive sub-circuit is connected to the first output terminal of the controller, the power-on startup circuit, and the coil terminal, and outputs a set of drive signals in the first state in response to the first startup signal;

[0031] The second drive sub-circuit is connected to the second output terminal of the controller and the coil terminal, and outputs a set of drive signals in the second state in response to the second startup signal.

[0032] Optionally, the first drive sub-circuit includes a second switching transistor, a third switching transistor, a second resistor, and a third resistor;

[0033] The second switching transistor includes a control electrode connected to the first output terminal of the controller and the power-on startup circuit, a first electrode connected to the negative electrode of the coil terminal and the first end of the third resistor, and a second electrode grounded;

[0034] The third switching transistor includes a control electrode connected to the second end of the third resistor and the first end of the second resistor, a first electrode connected to the auxiliary power supply circuit and the second end of the second resistor, and a second electrode connected to the positive electrode of the coil terminal.

[0035] Optionally, the second drive sub-circuit includes a fourth switching transistor, a fifth switching transistor, a fourth resistor, and a fifth resistor;

[0036] The fourth switching transistor includes a control electrode connected to the second output terminal of the controller, a first electrode connected to the positive electrode of the coil terminal and the first end of the fifth resistor, and a second electrode grounded;

[0037] The fifth switching transistor includes a control electrode connected to the second end of the fifth resistor and the first end of the fourth resistor, a first electrode connected to the auxiliary power supply circuit and the second end of the fourth resistor, and a second electrode connected to the negative electrode of the coil terminal.

[0038] Optionally, the detection circuit is further configured to generate a power-off signal when the AC source is disconnected;

[0039] The controller also responds to the power-off signal input at the detection terminal, controls the auxiliary power supply circuit to stop supplying power, and outputs the first start signal through the output terminal to control the contact terminal of the relay to be attracted.

[0040] In a second aspect, in an embodiment, the present application provides a circuit breaker including the above-mentioned circuit breaker starting system.

[0041] Through the above technical solutions, the present application at least includes the following beneficial technical effects: At the beginning stage of each power-on, the detection circuit generates a power-on signal based on the AC signal output by the AC source. Subsequently, the power-on starting circuit generates a first start signal that lasts for a preset duration based on the power-on signal. After receiving the first start signal, the driving circuit generates a driving signal group in a first state to make the contact terminal of the relay attracted, thereby realizing that at the moment of each AC source power-on, the relay is first controlled to close, enabling the AC source to supply power to the rear-end load, triggering the auxiliary power supply circuit of the circuit breaker to supply power, avoiding the problem that the relay cannot be powered on after being disconnected under abnormal conditions such as collision and vibration during production or transportation, and thus eliminating the problem of the circuit breaker being in a dead state due to the inability to supply power. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0043] Figure 1 It is a block diagram of a circuit breaker starting system in an embodiment of the present application;

[0044] Figure 2 It is a connection structure diagram of a detection circuit and a power-on starting circuit in an embodiment of the present application;

[0045] Figure 3Connection structure diagram of the drive circuit in an embodiment of the present application;

[0046] Figure 4 Connection structure diagram of the auxiliary power supply circuit in an embodiment of the present application.

[0047] Explanation of reference numerals: 1. Detection circuit; 2. Power-on startup circuit; 3. Drive circuit; 31. First drive sub-circuit; 32. Second drive sub-circuit; 4. Relay; 5. Controller; 6. AC rectification circuit. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present application.

[0049] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or description". Any embodiment described as "exemplary" in the present application is not necessarily construed as being more preferred or having more advantages than other embodiments. In order to enable any person skilled in the art to implement and use the present application, the following description is given. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art can recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid unnecessary details from obscuring the description of the present application. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0050] In the first aspect, as Figure 1As shown, in one embodiment, the present application provides a breaker starting system, which includes a detection circuit 1, a power-on starting circuit 2, a driving circuit 3, and a relay 4. Among them, the detection circuit 1 is connected to the AC source and generates a power-on signal based on the AC signal output by the AC source; the power-on starting circuit 2 is connected to the detection circuit 1 and the auxiliary power supply circuit, and generates a first starting signal that lasts for a preset duration according to the output of the auxiliary power supply circuit and the power-on signal; the relay 4 is connected to the AC source; the driving circuit 3 is connected to the power-on starting circuit 2 and the relay 4, and controls the relay 4 to be attracted in response to the first starting signal, so that the AC source supplies power to the breaker.

[0051] Among them, the preset duration can be an instantaneous duration at the microsecond level. After the AC source is powered on, a first starting signal that lasts for a preset duration is generated, and the driving circuit 3 is triggered by the first starting signal to generate a driving signal group in the first state, so that the relay 4 is controlled to close at the moment when the AC source is powered on.

[0052] Among them, the auxiliary power supply circuit may include a battery, and the battery may be a dry battery that is detachably arranged on the breaker.

[0053] In the above-mentioned embodiment, at the beginning of each power-on, the detection circuit 1 generates a power-on signal based on the AC signal output by the AC source. Subsequently, the power-on starting circuit 2 generates a first starting signal that lasts for a preset duration based on the power-on signal. After receiving the first starting signal, the driving circuit 3 generates a driving signal group in the first state, so that the contact end of the relay 4 is attracted, thereby realizing that at the moment when the AC source is powered on each time, the relay 4 is first controlled to close, so that the AC source supplies power to the backend load, triggering the auxiliary power supply circuit of the breaker to supply power, avoiding the problem that the relay 4 cannot be powered on after being disconnected under abnormal conditions such as collision and vibration during production or transportation, and thus eliminating the problem that the breaker appears in a dead state due to the inability to supply power. Refer to Figure 1 As a further embodiment of the breaker starting system, the breaker starting system further includes a controller 5. The controller 5 includes a power supply terminal connected to the relay 4 and the auxiliary power supply circuit, a detection terminal connected to the detection circuit 1, and an output terminal connected to the driving circuit 3; the controller 5 outputs a second starting signal through the output terminal after a preset duration in response to the power-on signal input by the detection terminal, and controls the auxiliary power supply circuit to supply power to the breaker; the driving circuit 3 controls the relay 4 to disconnect in response to the second starting signal, so as to cut off the power supply from the AC source to the breaker.

[0054] As an example, the AC source or the auxiliary power supply circuit supplying power to the breaker means supplying power to the backend load and the controller 5 in the breaker, where the backend load may be a communication component, such as a Bluetooth module, etc.

[0055] In some embodiments, the detection circuit 1 is further configured to generate a power-down signal when the AC power source is disconnected. The controller 5 also responds to the power-down signal input at the detection terminal, controls the auxiliary power supply circuit to stop supplying power, and outputs the first start signal through the output terminal; the drive circuit 3 responds to the first start signal to control the relay 4 to close.

[0056] Among them, the disconnection of the AC power source may be caused by the incorrect installation of the circuit breaker on the electricity meter or the disconnection of the AC power source due to the removal from the electricity meter, or may be due to the interruption of the AC power source caused by a power outage in the power grid. In the scenario where the AC power source is disconnected, since the circuit breaker does not need to detect the electricity meter data, the circuit breaker does not need to work.

[0057] In some embodiments, the relay 4 includes a coil terminal connected to the drive circuit 3 and a contact terminal connected to the controller and the AC power source; the drive circuit 3 generates a drive signal group in a first state in response to the first start signal, and generates a drive signal group in a second state in response to the second start signal; the coil terminal of the relay 4 is connected to the drive signal group in the first state to drive the contact terminal to close; the coil terminal of the relay 4 is connected to the drive signal group in the second state to drive the contact terminal to open.

[0058] Combined Figure 3 , by way of example, the relay 4 may be a magnetic latching relay. The coil terminal of the relay 4 may include the positive electrode of the coil terminal and the negative electrode of the coil terminal, and a coil is connected between the positive electrode and the negative electrode of the coil terminal. The contact terminal may include a stationary contact terminal and a moving contact terminal, and the moving contact terminal is connected to the moving contact inside the relay 4, and the stationary contact terminal is connected to the stationary contact; Figure 3 Pin 8 of the relay in [reference] is the negative electrode of the coil terminal, pin 1 is the positive electrode of the coil terminal, pin 6 is the moving contact terminal, and pin 4 is the stationary contact terminal. For example, the moving contact terminal may be connected to the AC power source, and the stationary contact terminal may be connected to the rear-end load. When a positive current provided by the drive signal group in the first state is received between the positive electrode and the negative electrode of the coil terminal of the relay 4, a magnetic field will be generated in the coil, thereby applying an electromagnetic force to the moving contact inside the relay 4, causing the moving contact to move towards the stationary contact and close with it, so that the AC power source is conducted to the rear-end load.

[0059] As an example, the working state of the circuit breaker can be divided into three stages in chronological order. The first stage is the AC power-on stage. At the moment when the AC power is turned on, the control relay 4 is closed to supply power from the AC power source to the backend loads such as the controller 5. The second stage is the continuous power supply stage of the AC power source. In this stage, the controller 5 has been powered on. At this time, in order not to consume the energy of the AC power source and cause the electricity meter to count, the controller 5 disconnects the power supply of the AC power source and switches to the auxiliary power supply circuit for power supply. Specifically, after a preset duration after the controller 5 receives the power-on signal, a second start signal is generated, so that the drive circuit 3 generates a drive signal group in the second state based on the second start signal. The drive signal group in the second state is used to control the contact end of the relay 4 to disconnect, so as to cut off the power supply from the AC power source to the backend loads. At the same time, the controller 5 controls the auxiliary power supply circuit to start power supply, thus realizing the change from the AC power source power supply to the auxiliary power supply circuit power supply. The third stage is the AC power-off stage. When the AC power source is disconnected, first, the detection circuit 1 generates a power-off signal and feeds it back to the controller 5, so that the controller 5 outputs a first start signal. The drive circuit 3 generates a drive signal group in the first state based on the first start signal, and makes the relay 4 attract to conduct the AC power source and the backend loads, so as to supply power to the backend loads faster when the AC power source is powered on next time. At the same time, since the circuit breaker does not need to work, the power supply of the auxiliary power supply circuit is disconnected, and the circuit breaker is in a power-off state to avoid the energy consumption of the auxiliary power supply circuit. In summary, the above three stages constitute a complete working process for the start-up and disconnection of the circuit breaker, ensuring the stability of the circuit breaker during operation in different stages.

[0060] Referring to Figure 2 , as an implementation manner of the detection circuit 1, the detection circuit 1 includes a first diode D1 and a first resistor R1. Among them, the first diode D1 includes an anode connected to the live wire end of the AC power source and a cathode connected to the first resistor R1; the first resistor R1 includes a first end connected to the cathode of the first diode D1 and a second end connected to the power-on start circuit 2.

[0061] As an example, multiple first resistors R1 can be provided. Referring to Figure 3 , Figure 3 illustrates an embodiment in which five first resistors R1 are provided. The five first resistors R1 are sequentially connected in series between the cathode of the first diode D1 and the power-on start circuit 2.

[0062] In some embodiments, the detection circuit 1 further includes a filtering sub-circuit. The filtering sub-circuit includes a second capacitor C2 and a sixth resistor R6. Among them, the second capacitor C2 includes a first end connected to the first resistor R1 and the power-on start circuit 2 and a second end grounded, and the sixth resistor R6 and the second capacitor C2 are connected in parallel.

[0063] In the above embodiments, the first diode D1 is a rectifying element that converts the AC signal at the live wire end of the AC source into unidirectional pulsating DC power. The voltage output from the cathode of the first diode D1 is divided by one or more first resistors R1 to generate a power-on signal, so as to ensure that the power-on signal output to the power-on startup circuit 2 and the controller 5 is within an appropriate range. Then, by setting the second capacitor C2 and the sixth resistor R6 in parallel to form a filtering sub-circuit, high-frequency noise and ripple in the voltage signal are filtered out, and the first capacitor C1 is also used to prevent damage to subsequent circuits caused by the generated instantaneous high voltage.

[0064] Referring to Figure 2 , as an embodiment of the power-on startup circuit 2, the power-on startup circuit 2 includes a first switching transistor Q1 and a first capacitor C1. Among them, the first switching transistor Q1 includes a control electrode connected to the detection circuit 1, a first electrode connected to the auxiliary power supply circuit, and a second electrode connected to the first capacitor C1; the first capacitor C1 includes a first end connected to the second electrode of the first switching transistor Q1 and a second end connected to the drive circuit 3.

[0065] In some embodiments, the power-on startup circuit 2 further includes a second diode D2; the second diode D2 includes a cathode connected to the second end of the first capacitor C1 and an anode grounded.

[0066] In some embodiments, the power-on startup circuit 2 further includes a seventh resistor R7 and an eighth resistor R8. The seventh resistor R7 includes a first end connected to the control electrode of the first switching transistor Q1 and a second end connected to the second electrode of the first switching transistor Q1, the first end of the eighth resistor R8, and the first end of the first capacitor C1.

[0067] As an example, the power-on startup circuit 2 generates a first startup signal that lasts for a preset duration. The preset duration is the charging duration of the first capacitor C1, and the preset duration is positively correlated with the capacitance value of the first capacitor C1. Therefore, different preset durations can be set by adjusting the capacitance value of the first capacitor C1. For example, the first capacitor C1 can be a capacitor with a capacitance value of 470 nF to 1 μF.

[0068] In the above-described embodiment, when the detection circuit 1 detects that the AC power supply outputs an AC signal, the first switching transistor Q1 is turned on, and the auxiliary power supply circuit charges the first capacitor C1 through the first switching transistor Q1. During the charging process, the charge in the first capacitor C1 changes to generate a current, causing the first capacitor C1 to conduct, and a high-level first start signal is output from the second terminal of the first capacitor C1. After the first capacitor C1 is fully charged, the charge in the first capacitor C1 no longer changes, causing the first capacitor C1 to stop conducting, and the first start signal is no longer output from the second terminal of the first capacitor C1. The second diode D2 serves as a discharging element for discharging the residual charge in the first capacitor C1 after the AC power source is powered off. In addition, the seventh resistor R7 and the eighth resistor R8 form a voltage dividing network for adjusting the voltage at the control electrode of the first switching transistor Q1 to ensure that the first switching transistor Q1 operates within a suitable voltage range.

[0069] Referring to Figure 3 , as an embodiment of the driving circuit 3, the driving circuit 3 includes a first driving sub-circuit 31 and a second driving sub-circuit 32; the output terminal of the controller 5 includes a first output terminal for outputting a first start signal and a second output terminal for outputting a second start signal; the first driving sub-circuit 31 is connected to the first output terminal of the controller 5, the power-on start circuit 2, and the coil terminal, and outputs a driving signal group in a first state in response to the first start signal; the second driving sub-circuit 32 is connected to the second output terminal of the controller 5 and the coil terminal, and outputs a driving signal group in a second state in response to the second start signal.

[0070] Combined with Figure 3 , as an example, the high-level first start signal PB1 is output by the controller 5 or the power-on start circuit 2, and the high-level second start signal PB2 is output by the controller 5. The driving signal group may include a first driving signal and a second start signal. The first driving signal is input to the positive electrode of the coil terminal of the relay 4, and the second start signal is input to the negative electrode of the coil terminal of the relay 4. The driving signal group in the first state may be a high-level first driving signal and a low-level second start signal, and the driving signal group in the second state may be a low-level first driving signal and a high-level second start signal. In this way, when the driving signal group is in the first state, the potential of the positive electrode of the coil terminal of the relay 4 is higher than the potential of the negative electrode of its coil terminal, causing the coil to be energized to provide an electromagnetic force to drive the contact terminal of the relay 4 to close. When the driving signal group is in the second state, the positive and negative electrodes of the coil terminal of the relay 4 are reversely connected, and the coil cannot provide an electromagnetic force to cause the contact terminal of the relay 4 to release.

[0071] As an implementation of the first driving sub - circuit 31, the first driving sub - circuit 31 includes a second switching transistor Q2, a third switching transistor Q3, a second resistor R2, and a third resistor R3. Among them, the second switching transistor Q2 includes a control electrode connected to the first output terminal of the controller 5 and the power - on startup circuit 2, a first electrode connected to the negative electrode of the coil terminal and the first end of the third resistor R3, and a second electrode grounded. The third switching transistor Q3 includes a control electrode connected to the second end of the third resistor R3 and the first end of the second resistor R2, a first electrode connected to the auxiliary power supply circuit and the second end of the second resistor R2, and a second electrode connected to the positive electrode of the coil terminal.

[0072] In some embodiments, the first driving sub - circuit 31 further includes a ninth resistor R9 and a tenth resistor R10. The ninth resistor R9 includes a first end connected to the controller 5 and the power - on startup circuit 2, and a second end connected to the first end of the tenth resistor R10 and the control electrode of the second switching transistor Q2; the tenth resistor R10 further includes a second end connected to the second electrode of the second switching transistor Q2 and the ground.

[0073] As an example, the second switching transistor Q2 can be an NMOS transistor, and the third switching transistor Q3 can be a PMOS transistor.

[0074] In the above - mentioned implementation, when the control electrode of the second switching transistor Q2 receives a high - level first startup signal, the second switching transistor Q2 conducts, pulling down the negative electrode of the coil terminal to the ground to output a low - level second startup signal to the negative electrode of the coil terminal. At the same time, the control electrode of the third switching transistor Q3 is also pulled down to the ground through the third resistor R3, enabling the third switching transistor Q3 to conduct, connecting the output of the auxiliary power supply circuit and the positive electrode of the coil terminal, and outputting a high - level first driving signal to the positive electrode of the coil terminal, that is, the driving signal group is in the first state at this time. In addition, the ninth resistor R9 and the tenth resistor R10 are used to limit the current and pull down the input of the control electrode of the second switching transistor Q2, so that the second switching transistor Q2 can conduct or cut off smoothly. The second resistor R2 and the third resistor R3 are voltage - dividing resistors of the third switching transistor Q3, so as to output a high level to the control electrode of the third switching transistor Q3 when the second switching transistor Q2 is not conducting, to keep the third switching transistor Q3 cut off.

[0075] As an implementation of the second drive sub - circuit 32, the second drive sub - circuit 32 includes a fourth switching transistor Q4, a fifth switching transistor Q5, a fourth resistor R4, and a fifth resistor R5. The fourth switching transistor Q4 includes a control electrode connected to the second output terminal of the controller 5, a first electrode connected to the positive electrode of the coil terminal and the first terminal of the fifth resistor R5, and a second electrode grounded; the fifth switching transistor Q5 includes a control electrode connected to the second terminal of the fifth resistor R5 and the first terminal of the fourth resistor R4, a first electrode connected to the auxiliary power supply circuit and the second terminal of the fourth resistor R4, and a second electrode connected to the negative electrode of the coil terminal.

[0076] In some embodiments, the second drive sub - circuit 32 includes an eleventh resistor R11 and a twelfth resistor R12. Among them, the eleventh resistor R11 includes a first terminal connected to the controller 5 and a second terminal connected to the first terminal of the twelfth resistor R12 and the control electrode of the fourth switching transistor Q4; the twelfth resistor R12 further includes a second terminal connected to the second electrode of the fourth switching transistor Q4 and the ground.

[0077] In the above - mentioned implementation, when the control electrode of the fourth switching transistor Q4 receives a high - level second start signal, the fourth switching transistor Q4 conducts, pulling down the positive electrode of the coil terminal to the ground to output a low - level first drive signal to the positive electrode of the coil terminal. At the same time, the control electrode of the fifth switching transistor Q5 is also pulled down to the ground through the fifth resistor R5, so that the fifth switching transistor Q5 conducts, connecting the auxiliary power supply circuit and the negative electrode of the coil terminal, and outputting a high - level second start signal to the negative electrode of the coil terminal. That is, at this time, the drive signal group is in the second state. In addition, the eleventh resistor R11 and the twelfth resistor R12 are used to limit the current and pull down the input of the control electrode of the fourth switching transistor Q4, so that the fourth switching transistor Q4 can conduct or cut off smoothly. The fourth resistor R4 and the fifth resistor R5 are voltage - dividing resistors of the fifth switching transistor Q5, so as to output a high level to the control electrode of the fifth switching transistor Q5 when the fourth switching transistor Q4 is not conducting, to keep the fifth switching transistor Q5 cut off.

[0078] Referring to Figure 3 , as a further implementation of the circuit breaker starting system, the circuit breaker starting system further includes an AC rectification circuit 6 disposed between the AC source and the relay 4. The AC rectification circuit 6 includes a varistor RV1, a fuse resistor FR1, and a third diode D3. The varistor RV1 includes a first terminal connected to the live wire terminal of the AC source and the first terminal of the fuse resistor FR1, and a second terminal connected to the neutral wire terminal of the AC source and the ground; the third diode D3 includes an anode connected to the second terminal of the fuse resistor FR1 and a cathode connected to the contact terminal of the relay 4.

[0079] In the above embodiments, an AC signal of 220V is output from the live wire terminal L and the neutral wire terminal N of the AC source. Overvoltage protection is provided by the varistor RV1, and the fuse resistor FR1 prevents damage caused by excessive current. Subsequently, the alternating current is converted into direct current by the third diode D3 and then connected to the relay 4, so as to control the power supply of the AC source through the on-off of the relay 4.

[0080] Referring to Figure 4 , as an embodiment of the auxiliary power supply circuit. The auxiliary power supply circuit further includes a fourth diode D4 and an electrostatic protection diode D5. Among them, the electrostatic protection diode D5 includes a first end connected to the positive electrode V+ of the battery and the anode of the fourth diode D4, and a second end connected to the negative electrode V- of the battery and the ground.

[0081] In the above embodiments, the electrostatic protection diode D5 is used to absorb the electrostatic impact generated at the battery interface and protect the circuit from damage. The fourth diode D4 is an anti-back charging diode to ensure that the backend load does not charge the battery reversely.

[0082] In a second aspect, in one embodiment, the present application provides a circuit breaker, and the circuit breaker includes the circuit breaker starting system as described above.

[0083] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

Claims

1. A circuit breaker starting system, characterized in that, Comprising: A detection circuit, connected to an AC source, generating a power-on signal based on an AC signal output by the AC source; A power-on startup circuit, connected to the detection circuit and an auxiliary power supply circuit, generating a first startup signal that lasts for a preset duration according to the output of the auxiliary power supply circuit and the power-on signal; A relay, connected to the AC source; A drive circuit is connected to the power-on startup circuit and the relay, and controls the relay to close in response to the first startup signal, so that the AC source supplies power to the circuit breaker.

2. The circuit breaker starting system according to claim 1, characterized in that The circuit breaker startup system further includes a controller; The controller includes a power supply terminal connected to the relay and the auxiliary power supply circuit, a detection terminal connected to the detection circuit, and an output terminal connected to the drive circuit; The controller outputs a second startup signal through the output terminal after the preset duration in response to the power-on signal input by the detection terminal, and controls the auxiliary power supply circuit to supply power to the circuit breaker; The drive circuit controls the relay to open in response to the second startup signal to cut off the power supply from the AC source to the circuit breaker.

3. The circuit breaker starting system according to claim 2, wherein The detection circuit is further configured to generate a power-off signal when the AC source is disconnected; The controller also controls the auxiliary power supply circuit to stop supplying power in response to the power-off signal input by the detection terminal, and outputs the first startup signal through the output terminal; The drive circuit controls the relay to close in response to the first startup signal.

4. The circuit breaker starting system according to any one of claims 2 to 3, characterized in that, The relay includes a coil terminal connected to the drive circuit and a contact terminal connected to the controller and the AC source; The drive circuit generates a first-state drive signal group in response to the first startup signal and a second-state drive signal group in response to the second startup signal; The coil terminal of the relay is connected to the first-state drive signal group to drive the contact terminal to close; The coil terminal of the relay is connected to the second-state drive signal group to drive the contact terminal to open.

5. The circuit breaker starting system according to claim 1, characterized in that, The detection circuit includes a first diode and a first resistor; The first diode includes an anode connected to the live wire terminal of the AC source and a cathode connected to the first resistor; The first resistor includes a first end connected to the cathode of the first diode and a second end connected to the power-on startup circuit.

6. The circuit breaker starting system according to claim 1, characterized in that The power-on startup circuit includes a first switching tube and a first capacitor; The first switching tube includes a control electrode connected to the detection circuit, a first electrode connected to the auxiliary power supply circuit, and a second electrode connected to the first capacitor; The first capacitor includes a first end connected to the second electrode of the first switching tube and a second end connected to the drive circuit.

7. The circuit breaker starting system according to claim 6, characterized in that, The power-on startup circuit further includes a second diode; the second diode includes a cathode connected to the second end of the first capacitor and an anode grounded.

8. The circuit breaker starting system according to claim 4, characterized in that, The drive circuit includes a first drive sub-circuit and a second drive sub-circuit; The output terminal of the controller includes a first output terminal for outputting the first startup signal and a second output terminal for outputting the second startup signal; The first drive sub - circuit is connected to the first output terminal of the controller, the power - on startup circuit, and the coil terminal, and outputs the drive signal group in the first state in response to the first startup signal; The second drive sub - circuit is connected to the second output terminal of the controller and the coil terminal, and outputs the drive signal group in the second state in response to the second startup signal.

9. The circuit breaker starting system according to claim 8, characterized in that, The first drive sub - circuit includes a second switching transistor, a third switching transistor, a second resistor, and a third resistor; The second switching transistor includes a control electrode connected to the first output terminal of the controller and the power - on startup circuit, a first electrode connected to the negative electrode of the coil terminal and the first end of the third resistor, and a second electrode grounded; The third switching transistor includes a control electrode connected to the second end of the third resistor and the first end of the second resistor, a first electrode connected to the auxiliary power supply circuit and the second end of the second resistor, and a second electrode connected to the positive electrode of the coil terminal.

10. The circuit breaker starting system according to claim 8, characterized in that, The second drive sub - circuit includes a fourth switching transistor, a fifth switching transistor, a fourth resistor, and a fifth resistor; The fourth switching transistor includes a control electrode connected to the second output terminal of the controller, a first electrode connected to the positive electrode of the coil terminal and the first end of the fifth resistor, and a second electrode grounded; The fifth switching transistor includes a control electrode connected to the second end of the fifth resistor and the first end of the fourth resistor, a first electrode connected to the auxiliary power supply circuit and the second end of the fourth resistor, and a second electrode connected to the negative electrode of the coil terminal.

11. A circuit breaker, characterized in that, It includes a circuit breaker startup system according to any one of claims 1 to 10.

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