CN213845192U

CN213845192U - Miniature circuit breaker

Info

Publication number: CN213845192U
Application number: CN202120236222.9U
Authority: CN
Inventors: 杨家发; 金福根; 肖民
Original assignee: Nanjing Zhengtailong Technology Co ltd
Current assignee: Nanjing Zhengtailong Technology Co ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-07-30
Anticipated expiration: 2031-01-28

Abstract

The utility model provides a miniature circuit breaker, include: the system comprises a first power supply, a second power supply, a controller, an electronic switch, a driving device and a contact system capable of realizing the closing and opening of the miniature circuit breaker; the first power supply and the second power supply are connected with the controller and can supply power to the controller; the first power supply is a direct-current energy storage power supply, is connected with the driving device through an electronic switch and supplies power to the driving device; the controller is connected with the electronic switch and controls the on and off of the electronic switch; the driving device and the contact system have a mechanical connection relationship to drive the opening of the contact system. The advantages are that: when the power grid has power failure, the direct-current energy storage power supply is used for supplying power, so that the power failure and the brake opening of the miniature circuit breaker are realized, and the impact of overvoltage generated in the moment of incoming electricity on the power grid or equipment can be solved; meanwhile, compared with the existing voltage-loss brake-separating mode, the power consumption can be greatly reduced.

Description

Miniature circuit breaker

Technical Field

The utility model belongs to the low-voltage apparatus field, concretely relates to miniature circuit breaker.

Background

After the power grid is cut off, instantaneous overvoltage can be generated at the moment of power supply recovery, the overvoltage is related to the number of loads at that time, the more the loads are, the more the instantaneous overvoltage is, the overvoltage can impact electric equipment in the power grid, and in the serious case, an electrical fire can be generated or electric shock hidden danger can be caused to personnel nearby the electric equipment, so that power failure and brake opening of the circuit breaker are particularly necessary.

At present, in order to realize power failure brake opening, a contactor is connected in series in a circuit, the contactor adopts a magnetic latching mode to realize circuit closing, magnetic latching loses power after power failure to realize power failure brake opening, referring to fig. 1, if a power grid fails, a voltage-loss release loses magnetic latching force, an armature moves upwards under the pulling force of a spring 1 to drive a hook to be disengaged from a lock chain, and the lock chain moves leftwards under the action of a spring 2 to separate a main contact. In this way, if the closing of the main contact needs to be ensured, the voltage-loss release needs to be electrified all the time, the magnetic holding force is used for overcoming the pulling force of the spring 2, and therefore, when the main contact is closed, the voltage-loss release needs to consume electric energy all the time.

Disclosure of Invention

The utility model provides a pair of miniature circuit breaker aims at solving the problem that current miniature circuit breaker can not have a power failure and separate the floodgate, and can realize the demand of low-power consumption.

In order to achieve the above object, the present invention provides a miniature circuit breaker, including: the system comprises a first power supply, a second power supply, a controller, an electronic switch, a driving device and a contact system capable of realizing the closing and opening of the miniature circuit breaker; the first power supply and the second power supply are connected with the controller and can supply power to the controller; the first power supply is a direct-current energy storage power supply, is connected with the driving device through an electronic switch and supplies power to the driving device; the controller is connected with the electronic switch and controls the on and off of the electronic switch; the driving device and the contact system have a mechanical connection relationship to drive the opening of the contact system.

After power failure, the controller controls the electronic switch to be conducted, and the first power supply supplies power to the driving device, so that the driving device works to drive the opening of the contact system.

Further, the second power source is an ac-to-dc power source (i.e., ac input, dc output), the input ac power is taken from the power grid, and the dc output terminal thereof is connected to the first power source to charge the first power source.

Optionally, the second power source is connected to the driving device through an electronic switch to supply power to the driving device. When the power grid is electrified and the contact system needs to be switched off, the second power supply can be used for supplying power to the driving device, so that the switching-off of the contact system is realized.

Optionally, the connection relationship between the controller and the first power supply and the second power supply further includes a voltage sampling connection, which performs voltage detection and charging management on the first power supply and the second power supply, and ensures that the output voltage of the first power supply is always maintained at the voltage level required by the driving device.

Optionally, the electronic switch is a MOS transistor switch.

Optionally, the first power source is a super capacitor or a rechargeable battery.

Optionally, the drive means is a dc motor or a dc electromagnetic trip.

Optionally, the dc electromagnetic trip comprises a first drive winding and a second drive winding, the first drive winding being connected to a first power source and the second drive winding being connected to a second power source.

The utility model has the advantages that: when the power grid has power failure, the direct-current energy storage power supply is used for supplying power, so that the power failure and the brake opening of the miniature circuit breaker are realized, and the impact of instantaneous overvoltage generated in the moment of incoming electricity on the power grid or equipment can be solved; meanwhile, compared with the existing voltage-loss switching-off mode, the direct-current energy storage power supply does not need to provide electric energy for switching-on when the power grid is electrified, and only needs to provide the electric energy for switching-off after power failure, so that the power consumption can be greatly reduced.

Drawings

FIG. 1: the principle schematic diagram of the existing voltage-loss tripping is shown.

FIG. 2: the utility model discloses a schematic block diagram of principle.

FIG. 3: the utility model discloses a drive schematic diagram one.

FIG. 4: the utility model discloses a charging reason picture of first power.

FIG. 5: the utility model discloses a drive schematic diagram two.

FIG. 6: the utility model discloses a drive schematic diagram three.

1. The power supply comprises a first power supply, 2, a second power supply, 3, a controller, 4, an electronic switch, 5, a driving device and 6, a contact system.

Detailed Description

It should be noted that the directional indicators (such as up, down, left, right, … …) related to the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly; the description of "first", "second", etc. referred to in this application is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated, whereby the features defined as "first", "second", etc. may explicitly or implicitly include at least one such feature; the term "connected" as used herein is to be construed broadly and, unless expressly stated or limited otherwise, may be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 2, the utility model provides a pair of miniature circuit breaker, include: the circuit breaker comprises a first power supply 1, a second power supply 2, a controller 3, an electronic switch 4, a driving device 5 and a contact system 6 capable of realizing the closing and opening of the circuit breaker; the first power supply 1 and the second power supply 2 are connected with the controller 3 and can supply power to the controller 3; the first power supply 1 is a direct-current energy storage power supply, is connected with the driving device 5 through the electronic switch 4 and supplies power to the driving device 5; the controller 3 is connected with the electronic switch 4 and controls the on and off of the electronic switch 4; the driving device 5 is in mechanical connection with the contact system 6 and drives the opening of the contact system 6.

Here, the first power supply 1 is implemented by a super capacitor, the electronic switch 4 is implemented by a MOS transistor switch, and the driving device 5 is implemented by a dc electromagnetic release, and referring to fig. 3, a specific connection method is provided, which is:

the positive electrode of the output end of the super capacitor C is connected with the positive electrode of the output end of the second power supply AC/DC, and then connected with the resistor R2 and the pin 2 of the MOS transistor Q2, the other end of the resistor R2 is connected with the C electrode of the triode Q1 and the pin 1 of the MOS transistor Q2, the B electrode of the triode Q1 is connected with the resistor R1, the other end of the resistor R1 is connected with the high-low level output pin I/O1 of the controller CPU, the E electrode of the triode Q1 is connected with the common ground GND (which can be regarded as the negative electrode of the DC power supply), the pin 3 of the MOS transistor Q2 is connected with the T1 end of the winding of the DC electromagnetic release TK, the capacitor C1 and the capacitor C2, and the T2 end of the winding of the DC electromagnetic release TK, the other end of the capacitor C1 and the other end of the capacitor C2 are connected with the GND.

Referring to fig. 4, the positive electrode of the output terminal of the second power AC/DC is connected to pin 2 of MOS transistor Q6, capacitor C3, resistor R16, and resistor R14, the other end of capacitor C3 is connected to GND, the other end of resistor R16 is connected to resistor R17 and sampling pin AD1 of the controller CPU, the other end of resistor R17 is connected to GND, the other end of resistor R14 is connected to the C electrode of transistor Q5 and pin 1 of MOS transistor Q6, the B electrode of transistor Q5 is connected to resistor R13, the other end of resistor R13 is connected to high-low level output pin I/O2 of the controller CPU, the E electrode of transistor Q5 is connected to GND, pin 3 of MOS transistor Q6 is connected to resistor R15, the other end of resistor R15 is connected to regulator Z1, resistor R18, the positive electrode of super capacitor C is connected to GND, the other end of regulator Z1 is connected to the resistor R18, and the sampling pin AD 19 and the control pin AD2 of the controller CPU, the other end of the resistor R19 is connected with GND, and the cathode of the super capacitor C is connected with GND.

With reference to fig. 2, 3, and 4, the process of implementing the switching-off after power failure is as follows: the controller 3 can detect the voltage of the first power supply 1 and the second power supply 2 respectively, meanwhile, the first power supply 1 and the second power supply 2 can both supply power for the controller 3, after the power grid has a power failure, naturally, the second power supply 2 has no output voltage, at the moment, the first power supply 1 supplies power for the controller 3, the controller 3 detects that the second power supply 2 has no voltage output, the first power supply 1 has voltage output and judges the power grid power failure, at the moment, the controller 3 sends out a driving signal to enable the electronic switch 4 to be conducted, the first power supply 1 supplies power for the driving device 5, the driving device 5 is enabled to act, and the opening of the contact system 6 is realized.

Further, the second power source 2 is an ac-to-dc power source (i.e., ac input, dc output), the input ac power is taken from the power grid, and the dc output terminal thereof is connected to the first power source 1 to charge the first power source 1. The second power supply 2 is used for charging the first power supply 1, so that the requirement of the storage capacity of the first power supply 1 can be reduced, the size of the first power supply 1 is reduced, and the first power supply is easier to install in a miniature circuit breaker. It is conceivable that the capacity of the first power source 1 is large enough to fully realize the amount of power required for the power cut-off throughout the life cycle of the miniature circuit breaker.

Optionally, the second power source 2 is connected to the driving device 5 through an electronic switch 4 to supply power to the driving device 5. When the contact system 6 needs to be opened, the second power supply 2 can be used for supplying power to the driving device, so that the opening of the contact system 6 is realized. The advantage of so setting up lies in, when the electric wire netting has the electricity, if because other trouble, need carry out the separating brake to miniature circuit breaker, need not to utilize first power 1 to supply power for drive arrangement 5, reduce the charge-discharge number of times of first power 1 to the life of extension first power 1.

Optionally, the connection relationship between the controller 3 and the first power supply 1 further includes a voltage sampling connection, which performs voltage detection on the first power supply 1 for charging management, so as to ensure that the output voltage of the first power supply 1 is always maintained at the voltage level required by the driving device 5. The quality of the first power supply 1 can be judged by detecting the voltage condition of the first power supply 1, and if necessary, corresponding communication means are added to inform a power utilization manager or a user, so that the miniature circuit breaker is maintained, and the implementation success rate of power failure and brake opening is ensured.

In the selection of the direct-current energy storage power supply, the direct-current energy storage power supply is implemented by using a rechargeable battery, and the implementation principle of the direct-current energy storage power supply is consistent with the implementation principle of the super capacitor, and the implementation principle can be simply understood as that all places related to the super capacitor in the drawing are directly replaced by the rechargeable battery.

Specifically, referring to fig. 5, after the positive electrode of the output terminal of the super capacitor C is connected to the positive electrode of the output terminal of the second power supply AC/DC, the super capacitor C is connected to the resistance R2 and the pin 2 of the MOS transistor Q2, the other end of the resistance R2 is connected to the C electrode of the transistor Q1 and the pin 1 of the MOS transistor Q2, the B electrode of the transistor Q1 is connected to the resistance R1, the other end of the resistance R1 is connected to the high-low level output pin I/O1 of the controller CPU, the E electrode of the transistor Q1 is connected to GND, the pin 3 of the MOS transistor Q2 is connected to the positive electrode of the winding of the DC motor a, the capacitor C1 and the capacitor C2, and the negative electrode of the winding of the DC motor a, the other end of the capacitor C1 and the other end of the capacitor C2 are connected to GND.

Alternatively, the dc electromagnetic trip may also be implemented with two windings, a first drive winding connected to a first power source and a second drive winding connected to a second power source. Specifically, referring to fig. 6, the positive electrode of the output end of the super capacitor C is connected to the resistor R2 and the pin 2 of the MOS transistor Q2, the other end of the resistor R2 is connected to the C electrode of the transistor Q1 and the pin 1 of the MOS transistor Q2, the B electrode of the transistor Q1 is connected to the resistor R1, the other end of the resistor R1 is connected to the high/low level output pin I/O1 of the controller CPU, the E electrode of the transistor Q1 is connected to GND, the pin 3 of the MOS transistor Q2 is connected to the T1 end of the first drive winding of the dc electromagnetic release TK, the capacitor C1 and the capacitor C2, and the T2 end of the first drive winding of the dc electromagnetic release TK, the other end of the capacitor C1 and the other end of the capacitor C2 are connected to GND.

The positive pole of the output end of the second power supply AC/DC is connected with a resistor R3 and a pin 2 of a MOS tube Q4, the other end of a resistor R3 is connected with a C pole of a triode Q3 and a pin 1 of a MOS tube Q4, a B pole of a triode Q3 is connected with a resistor R4, the other end of the resistor R4 is connected with a high-low level output pin I/O3 of the controller CPU, an E pole of a triode Q3 is connected with GND, a pin 3 of the MOS tube Q4 is connected with a T3 end of a second driving winding of the direct current electromagnetic release TK, a capacitor C3 and a capacitor C4, and a T4 end of the second driving winding of the direct current electromagnetic release TK, the other end of the capacitor C3 and the other end of the capacitor C4 are connected with GND.

In order to understand better how the tripping of contact system is realized to electromagnetic trip, we can refer to the patent that application number is CN201510280723.6, the name is the tripping system of electric leakage circuit breaker, disclose operating device (correspond the utility model discloses a contact system) in detail constitutes and electromagnetic type electric leakage trip (correspond the utility model discloses a direct current electromagnetic trip) drive operating device realizes tripping (corresponds the technical scheme of the tripping of the utility model) in this patent.

In this solution, mention is made of: "when tripping current reaches the regulation scope, the thimble of electric leakage release can promote the release lever action, and the release lever then promotes the driving lever, and operating device realizes the tripping operation", corresponds to the utility model discloses in, we can understand it into: when power is cut off, the controller controls the electronic switch to be closed to supply power to the driving device, and power cut and brake opening of the miniature circuit breaker are achieved.

Similarly, in order to better understand how the motor performs opening and closing of the contact system, we may refer to a patent with an authorization publication number of CN105609383B and a name of an opening and closing operation control device and a circuit breaker, and in this patent, a technical scheme for performing opening and closing operations on a miniature circuit breaker by using the motor is disclosed. In the technical scheme, the motor is subjected to power supply control, when the motor is controlled to rotate forwards, a series of power transmission devices are driven, the handle of the miniature circuit breaker is switched on, and when the motor is controlled to rotate backwards, a series of power transmission devices are driven, so that the handle of the miniature circuit breaker is switched off.

It should be understood that controlling the forward and reverse rotation of the motor is a well-established technology, and the forward and reverse rotation of the motor can be realized by changing the positive and negative poles of the power supply of the direct current motor.

In view of this, the utility model provides an among the technical scheme, be connected the output and the motor of first power, as long as define the relation of the positive, negative power supply order and the motor just, the reversal of motor, just can realize miniature circuit breaker's separating brake action, realize the purpose of having a power failure separating brake.

Finally, it should be noted that the above-disclosed embodiments of the present invention are only provided to help illustrate the present invention. The preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. It is obvious that all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

Claims

1. A miniature circuit breaker, comprising: the system comprises a first power supply, a second power supply, a controller, an electronic switch, a driving device and a contact system capable of realizing the closing and opening of the miniature circuit breaker;

the first power supply and the second power supply are connected with the controller and can supply power to the controller;

the first power supply is a direct-current energy storage power supply, is connected with the driving device through an electronic switch and supplies power to the driving device;

the controller is connected with the electronic switch and controls the electronic switch to be switched on and off;

the driving device and the contact system have a mechanical connection relationship to drive the opening of the contact system.

2. The miniature circuit breaker of claim 1 wherein said second power source is an ac to dc power source and the input ac power is taken from the power grid.

3. The miniature circuit breaker of claim 2 wherein said second power source is connected to said first power source for charging said first power source.

4. A miniature circuit breaker according to claim 2 wherein said second power source is connected to said drive means through an electronic switch to provide power to said drive means.

5. The miniature circuit breaker of claim 3 wherein said controller is connected to said first power source and said second power source in a manner that further comprises a voltage sampling connection for voltage sensing and charge management of said first power source and said second power source.

6. The miniature circuit breaker of any of claims 1-5, wherein said first power source is a super capacitor or rechargeable battery.

7. A miniature circuit breaker according to any of claims 1-5 wherein said electronic switch is a MOS tube switch.

8. A miniature circuit breaker according to any of claims 1-5 wherein said actuating means is a DC motor or a DC electromagnetic trip.

9. The miniature circuit breaker of claim 8 wherein said dc electromagnetic trip comprises a first drive winding and a second drive winding, said first drive winding being connected to a first power source and said second drive winding being connected to a second power source.