CN203312762U - Three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection - Google Patents
Three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection Download PDFInfo
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- CN203312762U CN203312762U CN2013202609180U CN201320260918U CN203312762U CN 203312762 U CN203312762 U CN 203312762U CN 2013202609180 U CN2013202609180 U CN 2013202609180U CN 201320260918 U CN201320260918 U CN 201320260918U CN 203312762 U CN203312762 U CN 203312762U
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Abstract
The utility model discloses a three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection. The three-phase overvoltage and undervoltage miniature circuit breaker is composed of a main loop, a system power supply, an overvoltage detection circuit, an undervoltage detection circuit, an electric leakage detection circuit and a tripping loop. A capacitance isolation straight-through alternating circuit is disposed in the system power supply. Operational amplifiers are disposed in the overvoltage detection circuit, the undervoltage detection circuit and the electric leakage detection circuit. A 5V voltage detection chip is adopted to detect and determine voltage signals which are amplified and compared through the operational amplifiers, and to give a tripping order, and thus a functional of the tripping loop is realized.
Description
Technical field
The utility model relates to a kind of miniature circuit breaker, particularly a kind of earth leakage protective three-phase overvoltage, under-voltage miniature circuit breaker be with, belong to low-voltage circuit breaker manufacturing technology field.
Background technology
At present, on market, roughly can be divided into overvoltage, under-voltage and earth leakage protective circuit breaker: single-phase overvoltage/undervoltage protection, single-phase earth leakage protective circuit breaker and single-phase overvoltage adds the large class of earth leakage circuit breaker two of earth leakage protective and three-phase.On market, seldom have and possess simultaneously overvoltage/undervoltage and earth leakage protective in the three-phase miniature circuit breaker of one.Analyze reason mainly by following some: 1. the profile of this serial miniature circuit breaker product is substantially all normal structure, and its mounting means and inside dimension space are fixed substantially.General overvoltage/undervoltage and leakage function are all to be controlled and realized by electronic device, and the function that realize is many, and its wiring board size must increase, and implements more difficult.2. the cost requirement of these series of products low and require reliable, thereby greatly limited type selecting and the design of electronic device.3. household electricity is mostly the single-phase electricity user, the electricity consumption user of three-phase electricity seldom occurs, has restricted the development of family expenses three-phase overvoltage/undervoltage circuit breaker.
Summary of the invention
The utility model purpose is to overcome the deficiency that above-mentioned technology exists, and a kind of low cost is provided, high performancely is with earth leakage protective three-phase overvoltage/undervoltage miniature circuit breaker.
For achieving the above object.The utility model has been taked following technical scheme:
Described in the utility modelly be with earth leakage protective three-phase overvoltage/undervoltage miniature circuit breaker, include major loop, system power supply, over-voltage detection circuit, undervoltage detection circuit, electric-leakage detection circuit, dropout loop, it is characterized in that: in system power supply, be provided with electric capacity every straight-through alternating current road; In over-voltage detection circuit and undervoltage detection circuit and electric-leakage detection circuit, be provided with operational amplifier, adopt the 5V voltage checking chip to detect, judge the voltage signal that amplifies, compares through operational amplifier, sending the order of threading off, thereby realizing the function in dropout loop.
The utility model technology after above-mentioned design compared with prior art, has the following advantages:
1,, keeping the constant situation of original miniature circuit breaker overall dimension, by increasing the form of an annex, realize the overvoltage of three-phase, the protection of under-voltage and leakage function.Not only reduced the design cost of outward appearance, and perfect the realization coordinate with former miniature circuit breaker, facilitate customer upgrade and installation.
2, the overvoltage of this miniature circuit breaker, under-voltage and creepage protection function be mainly by the operational amplifier of two 4 passages, utilizes it to amplify and comparison principle realizes.Thereby the design of the hardware circuit of greatly simplifying, saved the space that hardware circuit takies.
3, the defencive function of circuit adopts the design principle of amplifying circuit, draws according to certain computing formula.Make circuit have higher stability and reliability.
The accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the utility model
Wherein: 1-major loop 2-system power supply 3-over-voltage detection circuit 4-undervoltage detection circuit 5-electric-leakage detection circuit 6-dropout loop
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the present utility model is described in further detail:
Described in the utility modelly be with earth leakage protective three-phase overvoltage/undervoltage miniature circuit breaker, formed by major loop 1, system power supply 2, over-voltage detection circuit 3, undervoltage detection circuit 4, electric-leakage detection circuit 5, dropout loop 6.System power supply 2 obtains working power by capacitance decompression from major loop 1, stable working power is provided for respectively over-voltage detection circuit 3, undervoltage detection circuit 4, electric-leakage detection circuit 5.Over-voltage detection circuit 3 detects the voltage condition of major loop in real time, when any phase voltage value in three-phase phase voltage surpasses the overvoltage threshold values, sends trip signal notice dropout loop 6.Undervoltage detection circuit 4 detects the voltage condition of major loop in real time, when in three-phase phase voltage, any phase voltage value is lower than under-voltage threshold values, sends trip signal notice dropout loop 6.Electric-leakage detection circuit 5 is responsible for detecting in real time the electric leakage situation that major loop produces, and sends trip signal notice dropout loop 6 if produce electric leakage.Dropout loop 6 is mainly used in receiving the trip signal of over-voltage detection circuit 3, undervoltage detection circuit 4, electric-leakage detection circuit 5, when the wherein trip signal on any road being detected, send the moving contact that the order of threading off touches major loop 1, cut off major loop 1 power supply.
As shown in Figure 2: the present embodiment with earth leakage protective three-phase overvoltage/undervoltage miniature circuit breaker, utilize the voltage detecting function of the amplification of operational amplifier and comparing function, voltage checking chip to realize the overvoltage of three-phase phase voltage, under-voltage and earth leakage protective.
Over-voltage detection circuit 3 circuit adopt operational amplification circuits, will exchange that A, B, C three-phase voltage value are dwindled, become direct current signal DC_A, DC_B and DC_C after rectification, filtering.Direct voltage is elevated to the dropout trigger voltage when overvoltage, triggers trip circuit.Wherein D2, D5, D8 are respectively the exclusive disjunction diodes of three direct current signals, get the voltage that wherein voltage is the highest and drive dropout loop 6, and Trip_V is the drop away voltage of output.
Electric-leakage detection circuit 5 carries out detection of electrical leakage by sampling resistor R17 to the CT creepage mutual inductor of major loop 1, utilizes the amplification principle of amplifier, faint electric leakage signal is enlarged into to the driving signal in dropout loop 6.When leakage current reaches the electric leakage threshold values, drive dropout loop 6, Gate is electric leakage dropout driving voltage.
Dropout loop 6:U3 is the 5V voltage checking chip, mainly uses and the output voltage signal that detects overvoltage, under-voltage circuit (Trip_V " drop away voltage " value).3 pin of its U3 are output low level when voltage is normal, and its input voltage will be over 5V when overvoltage or when under-voltage, and the Vout output of U3 is drawn high and driven the Q3 controlled silicon conducting by power supply VCC_12V, makes the L2 tripping coil obtain the electric order of threading off of sending.In addition " Gate " port triggered on pin at silicon controlled is the triggering signal of electric leakage, namely, when electric leakage reaches certain value, triggers the controllable silicon action.
Claims (1)
1. be with earth leakage protective three-phase overvoltage/undervoltage miniature circuit breaker for one kind, include major loop, system power supply, over-voltage detection circuit, undervoltage detection circuit, electric-leakage detection circuit, dropout loop, it is characterized in that: in system power supply, be provided with electric capacity every straight-through alternating current road; In over-voltage detection circuit and undervoltage detection circuit and electric-leakage detection circuit, be provided with operational amplifier, adopt the 5V voltage checking chip to detect, judge the voltage signal that amplifies, compares through operational amplifier, sending the order of threading off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202609180U CN203312762U (en) | 2013-05-09 | 2013-05-09 | Three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202609180U CN203312762U (en) | 2013-05-09 | 2013-05-09 | Three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203312762U true CN203312762U (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202609180U Expired - Lifetime CN203312762U (en) | 2013-05-09 | 2013-05-09 | Three-phase overvoltage and undervoltage miniature circuit breaker with earth leakage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203312762U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872765A (en) * | 2017-04-10 | 2017-06-20 | 浦北县金洋电厨具有限公司 | Input voltage measurement device |
| CN107404110A (en) * | 2017-07-13 | 2017-11-28 | 成都麦隆电气有限公司 | A kind of non-isolated energy storage three-phase off-network inversion electric power system |
-
2013
- 2013-05-09 CN CN2013202609180U patent/CN203312762U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872765A (en) * | 2017-04-10 | 2017-06-20 | 浦北县金洋电厨具有限公司 | Input voltage measurement device |
| CN107404110A (en) * | 2017-07-13 | 2017-11-28 | 成都麦隆电气有限公司 | A kind of non-isolated energy storage three-phase off-network inversion electric power system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |
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| CX01 | Expiry of patent term |