CN204068191U - AFDD fault electric arc protector - Google Patents
AFDD fault electric arc protector Download PDFInfo
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- CN204068191U CN204068191U CN201420543870.9U CN201420543870U CN204068191U CN 204068191 U CN204068191 U CN 204068191U CN 201420543870 U CN201420543870 U CN 201420543870U CN 204068191 U CN204068191 U CN 204068191U
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Abstract
The utility model provides a kind of AFDD fault electric arc protector, it comprises power module for overturning step-down, and civil power L phase is held the reference voltage reference point GND as built-in system power supply, core cpu module is for the treatment of the signal received, current sense resistor module, arc current signal processing module, burst process module and dropout processing module, achieve the miniaturization of integrated power, conventional current instrument transformer is given up in arc current sampling, directly from forceful electric power circuit, gather arc current signal, achieve the with low cost of AFDD fault electric arc protector, volume is little, quality is little, higher without Flux saturation cost performance, do not limit by small product size, the test to little arc current and large arc current can be taken into account simultaneously, and precision is in 5% scope.
Description
Technical field
The utility model relates to AFDD fault electric arc protector, be specifically related to a kind of for there is arc fault to load all kinds of in terminal power distribution circuit time detection and the circuit principle structure of protective effect, have the circuit structure of residual current protecting effect concurrently simultaneously.
Background technology
What current AFDD fault electric arc protector (AFDD and arc fault detection device) adopted substantially is built-in isolated alternating current-direct current step-down switching power supply is power supply, the reference point of system power supply is connected on the neutral line, Current Transformer sampling arc current, the design difficulty of designer is increased like this in the application of actual miniature circuit breaker, the product cost designed is too high, volume is large, quality is large, in limited space, current transformer can not take into account the sampling precision of small area analysis and big current simultaneously simultaneously, Flux saturation phenomenon cannot have accurately been tested to big current, effectively can not realize the detection to fault electric arc signal and protective effect.
Utility model content
For the shortcoming and defect that prior art exists; the AFDD fault electric arc protector that the utility model is designed and developed; achieve with low cost, volume is little, quality is little, higher without Flux saturation cost performance; do not limit by small product size; can take into account the test to small area analysis and big current, and precision is in 5% scope simultaneously.
The utility model provides a kind of AFDD fault electric arc protector, and it comprises:
Civil power L phase for overturning step-down, and is held the reference voltage reference point GND as built-in system power supply by power module;
Current sense resistor module, its input is connected with the GND of power module, and the other end is connected to civil power L phase line output terminal, for directly gathering arc signal at forceful electric power circuit;
Arc current signal processing module, is connected with current sense resistor module and circuit breaker load output with its input pole, its output and core cpu model calling, for receiving the arc signal that process current sense resistor module produces;
Dropout processing module, for controlling circuit breaker tripping operation;
Burst process module, its input pin and dropout processing module are connected in parallel, burst process module output and core cpu model calling, for the treatment of when there is parallel arc in circuit, voltage signal change on the N neutral line, the voltage signal change after process changes into set of pulses Signal transmissions to core cpu processing module;
The signal that core cpu module sends for the treatment of arc current signal processing module, and output a control signal to burst process module.
Described power module adopts the convertible switch power module of non-isolated alternating current-direct current step-down.
The convertible switch power module of described non-isolated alternating current-direct current step-down comprises switch mosfet module, the D pole of described switch mosfet module with for holding the input circuit of halfwave rectifier to be connected to the N of input AC electricity, the S pole of described switch mosfet module is connected with Power Processing output circuit, the FB pole of described switch mosfet module is connected with differential pressure drop volt circuit, BP pole and the bypass noise of described MOSFEET switch module suppress circuit to be connected, output and the fast recovery diode D2 that connects between differential pressure drop volt circuit of microswitch power supply, alternating current L holds as microswitch power reference reference point by described microswitch power supply.
Described current sense resistor module adopts current sense resistor.
Described AFDD fault electric arc protector is also provided with electric leakage signal conditioning module and creepage mutual inductor.
The input piezo-resistance in parallel with between GND of described power module.
The input series diode D2 of described power module, the negative pole of diode D2 is connected with the input of power module.
The negative pole of series diode D1 between the input pin of described power module and burst process module, diode D1 is connected with the input pin of burst process module.
The beneficial effect of utility model is: the miniaturization achieving integrated power; conventional cores formula current transformer is given up in arc current sampling; directly from forceful electric power circuit, gather arc current signal; achieve AFDD fault electric arc protector with low cost, volume is little, quality is little, higher without Flux saturation cost performance; do not limit by small product size; can take into account the test to little arc current and large arc current, and precision is in 5% scope simultaneously.
Accompanying drawing explanation
Fig. 1 is logical schematic of the present utility model.
Fig. 2 is the circuit theory diagrams of power module.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
As shown in Figure 1, the utility model provides a kind of AFDD fault electric arc protector, and it comprises:
Power module is for overturning step-down; and civil power L phase is held the reference voltage reference point GND as built-in system power supply; described AFDD fault electric arc protector uses the convertible switch power module of non-isolated alternating current-direct current step-down; fast recovery rectifier diode cathode is connected to N neutral terminal, diode cathode connecting valve power module input IN pole.
Described power module adopts the convertible switch power module of miniature non-isolated alternating current-direct current step-down of reverse wiring, system power supply reference point GND is chosen at L phase line input, the input series diode D2 of described power module, the negative pole of diode D2 is connected with the input of power module, described diode D2 adopts fast recovery rectifier diode, its positive pole is connected to N neutral terminal, diode cathode connecting valve power module input IN pole.
As shown in Figure 2, the convertible switch power module of described non-isolated alternating current-direct current step-down comprises switch mosfet module, the D pole of described switch mosfet module with for holding the input circuit of halfwave rectifier to be connected to the N of input AC electricity, the S pole of described switch mosfet module is connected with Power Processing output circuit, the FB pole of described switch mosfet module is connected with differential pressure drop volt circuit, BP pole and the bypass noise of described MOSFEET switch module suppress circuit to be connected, output and the fast recovery diode D2 that connects between differential pressure drop volt circuit of microswitch power supply, alternating current L holds as microswitch power reference reference point by described microswitch power supply.
Utilize the negative half-cycle characteristic of AC power, by the direct step-down of microswitch power supply, overturn and system power supply reference point is connected to phase line plant-grid connection point, on phase line electromotive force basis, lifting 3.3 ~ 5.5V is as DC output power.The design cost of power supply own is low, for the sampling of follow-up function circuit signal can directly provide realization possibility, the little components and parts of volume few from the collection of forceful electric power circuit, mentality of designing is simple.
Input circuit holds input to carry out halfwave rectifier to N, by positive half wave current cut-off, only allow the electric current of negative half-wave to pass through, negative half-wave current by just realizing the negative DC power supply of a lifting 3.3 ~ 5.5 by switch mosfet module U2 step-down and differential pressure drop volt circuit again after diode rectification in former L phase.
Described input circuit is as follows: a pole of electric capacity C2, electric capacity C3, the negative pole of diode D6 are connected with the L phase line of power input with the negative pole of electric capacity C7, and connection current limliting wire-wound resistor R1 one end, power input N pole, current limliting wire-wound resistor R1 other end connection rectifier diode D3 positive pole, rectifier diode D3 negative pole series inductance L1 one end, inductance L 1 other end are connected with the D pole of electric capacity C3, electric capacity C2 and switch mosfet module U2.
Electric current after halfwave rectifier, through the negative half-wave current of diode D3 halfwave rectifier power input, is then input to switch mosfet module by the N phase line input of power input.
Described Power Processing output circuit circuit is as follows: switch mosfet module S pole is connected with inductance L 2 one end with the negative pole of electric capacity C4, diode D6 negative pole, electric capacity C1, and the other end of inductance L 2 is connected with power supply output cathode with diode D2 negative pole, electric capacity C7 positive pole.
Diode D6 adopts fast recovery diode, by the output stage being combined as power supply of electric capacity C4, diode D6 and electric capacity C1.
Described differential pressure drop volt circuit comprises resistance R3, resistance R2 and electric capacity C1, described divider resistance R3 mono-termination switch mosfet module FB pole is connected with one end of dropping resistor R2, described buck diode R2 one end connects R3 resistance, the other end is connected with the positive pole of electric capacity C1 and the positive pole of diode D2, described electric capacity C1 positive pole and resistance R2 one end, the positive pole of diode D2 connects, C1 negative pole and switch mosfet module S pole, electric capacity C4, resistance R3, diode D6 is connected with inductance L 2, by the acting in conjunction of input circuit and differential pressure drop volt circuit, realize out-put supply 3.3-5.5V.
Described bypass noise suppresses circuit to adopt bypass noise to suppress electric capacity C4, and its one end connects switch mosfet module BP pole, and the other end is connected with inductance L 2 one end with switch mosfet module S pole, resistance R3, diode D6 positive pole, electric capacity C1 negative pole.Bypass noise suppresses electric capacity to be used for conducting or absorbs a kind of electric capacity of alternating component in certain element or a set of pieces.AC portion in usual alternating current-direct current is removed, and allows direct current component to pass through to be added with the element of shunt capacitance.
Current sense resistor module, its input is connected with the GND of power module, the other end is connected to civil power L phase line output terminal, for directly gathering current signal at forceful electric power circuit, described current sense resistor module adopts current sense resistor, series welding is connected on circuit breaker conducting system connector, is connected to arc signal conditioning module signal input part, realizes arc signal and directly gather from forceful electric power circuit from its output lead-out wire one end.
Arc current signal processing module, is connected with current sense resistor module and circuit breaker load output with its input pole, its output and core cpu model calling, for receiving the arc signal that process current sense resistor module produces; Input connects current sense resistor output lead, and after conditioning, arc signal exports the A/D pin connecting core cpu module.
Dropout processing module, for controlling circuit breaker tripping operation, it is with thermo magnetic trip release model calling, controls dropout.
Burst process module, its input pin and dropout processing module are connected in parallel, burst process module output and core cpu model calling, for the treatment of when there is parallel arc in circuit, the voltage signal change on the N neutral line.
The input piezo-resistance in parallel with between GND of described power module.
The negative pole of series diode D1 between the input pin of described power module and burst process module, diode D1 is connected with the input pin of burst process module.
The input of described burst process module connects the negative pole of diode D1, and diode D1 positive pole is connected in N neutral terminal in parallel with diode D2 positive pole and piezo-resistance one pole, an A/D pin of the output connection CPU of burst process module.
The signal that core cpu module sends for the treatment of arc current signal processing module, and output a control signal to burst process module.
Described AFDD fault electric arc protector is also provided with electric leakage signal conditioning module and creepage mutual inductor, takes into account detection of electrical leakage and defencive function simultaneously.
Embodiment should not be considered as restriction of the present utility model, but any improvement done based on spirit of the present utility model, all should within protection range of the present utility model.
Claims (8)
1. an AFDD fault electric arc protector, is characterized in that: it comprises:
Civil power L phase for overturning step-down, and is held the reference voltage reference point GND as built-in system power supply by power module;
Current sense resistor module, its input is connected with the GND of power module, and the other end is connected to civil power L phase line output terminal, for directly gathering arc signal at forceful electric power circuit;
Arc current signal processing module, is connected with current sense resistor module and circuit breaker load output with its input pole, its output and core cpu model calling, for receiving the arc signal that process current sense resistor module produces;
Dropout processing module, for controlling circuit breaker tripping operation;
Burst process module, its input pin and dropout processing module are connected in parallel, burst process module output and core cpu model calling, for the treatment of when there is parallel arc in circuit, voltage signal change on the N neutral line, the voltage signal change after process changes into set of pulses Signal transmissions to core cpu processing module;
The signal that core cpu module sends for the treatment of arc current signal processing module, and output a control signal to burst process module.
2. AFDD fault electric arc protector according to claim 1, is characterized in that, described power module adopts the convertible switch power module of non-isolated alternating current-direct current step-down.
3. AFDD fault electric arc protector according to claim 2, it is characterized in that, the convertible switch power module of described non-isolated alternating current-direct current step-down comprises switch mosfet module, the D pole of described switch mosfet module with for holding the input circuit of halfwave rectifier to be connected to the N of input AC electricity, the S pole of described switch mosfet module is connected with Power Processing output circuit, the FB pole of described switch mosfet module is connected with differential pressure drop volt circuit, BP pole and the bypass noise of described MOSFEET switch module suppress circuit to be connected, output and the fast recovery diode D2 that connects between differential pressure drop volt circuit of microswitch power supply, alternating current L holds as microswitch power reference reference point by described microswitch power supply.
4. AFDD fault electric arc protector according to claim 1, is characterized in that, described current sense resistor module adopts current sense resistor.
5. AFDD fault electric arc protector according to claim 1, is characterized in that, described AFDD fault electric arc protector is also provided with electric leakage signal conditioning module and creepage mutual inductor.
6. AFDD fault electric arc protector according to claim 1, is characterized in that, the input piezo-resistance in parallel with between GND of described power module.
7. AFDD fault electric arc protector according to claim 1, is characterized in that, the input series diode D2 of described power module, the negative pole of diode D2 is connected with the input of power module.
8. AFDD fault electric arc protector according to claim 1, is characterized in that, the negative pole of series diode D1 between the input pin of described power module and burst process module, diode D1 is connected with the input pin of burst process module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420543870.9U CN204068191U (en) | 2014-09-19 | 2014-09-19 | AFDD fault electric arc protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420543870.9U CN204068191U (en) | 2014-09-19 | 2014-09-19 | AFDD fault electric arc protector |
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| CN204068191U true CN204068191U (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420543870.9U Withdrawn - After Issue CN204068191U (en) | 2014-09-19 | 2014-09-19 | AFDD fault electric arc protector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269814A (en) * | 2014-09-19 | 2015-01-07 | 浙江天正电气股份有限公司 | AFDD fault arc protector |
| CN106940410A (en) * | 2017-05-18 | 2017-07-11 | 艾迪迪电气（苏州）有限公司 | Arc fault protector oscillating arc testboard |
| CN107144747A (en) * | 2017-05-18 | 2017-09-08 | 艾迪迪电气（苏州）有限公司 | Arc fault protector combined test stand |
| CN107505528A (en) * | 2017-10-18 | 2017-12-22 | 福州大学 | The Intelligentized test system and method for testing of electric arc fault protection electrical equipment |
-
2014
- 2014-09-19 CN CN201420543870.9U patent/CN204068191U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269814A (en) * | 2014-09-19 | 2015-01-07 | 浙江天正电气股份有限公司 | AFDD fault arc protector |
| CN104269814B (en) * | 2014-09-19 | 2017-09-12 | 浙江天正电气股份有限公司 | AFDD fault electric arc protectors |
| CN106940410A (en) * | 2017-05-18 | 2017-07-11 | 艾迪迪电气（苏州）有限公司 | Arc fault protector oscillating arc testboard |
| CN107144747A (en) * | 2017-05-18 | 2017-09-08 | 艾迪迪电气（苏州）有限公司 | Arc fault protector combined test stand |
| CN106940410B (en) * | 2017-05-18 | 2020-08-21 | 艾迪迪电气（苏州）有限公司 | Arc fault protector vibration arc test bench |
| CN107144747B (en) * | 2017-05-18 | 2020-08-21 | 艾迪迪电气（苏州）有限公司 | Comprehensive test bench for arc fault protector |
| CN107505528A (en) * | 2017-10-18 | 2017-12-22 | 福州大学 | The Intelligentized test system and method for testing of electric arc fault protection electrical equipment |
| CN107505528B (en) * | 2017-10-18 | 2019-10-15 | 福州大学 | The Intelligentized test system and test method of electric arc fault protection electric appliance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141231 Effective date of abandoning: 20170912 |
|
| AV01 | Patent right actively abandoned |