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Publication numberCN100432683 C
Publication typeGrant
Application numberCN 200510033926
Publication date12 Nov 2008
Filing date31 Mar 2005
Priority date31 Mar 2005
Also published asCN1841074A
Publication number200510033926.1, CN 100432683 C, CN 100432683C, CN 200510033926, CN-C-100432683, CN100432683 C, CN100432683C, CN200510033926, CN200510033926.1
Inventors吴伟宾, 沈乾军, 伟 王, 新 王
Applicant珠海格力电器股份有限公司
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Fault arc detection method and protection circuit thereof
CN 100432683 C
Abstract  translated from Chinese
本发明公开了一种故障电弧检测方法及其保护电路,该方法能通过保护电路检测到危险电弧,属于电子领域。 The present invention discloses a method of arc fault detection and protection circuit, which can protect the circuit detects dangerous arc belongs to the field of electronics. 该方法为:通过信号采样装置实时对电流信号进行采样,并将采样数据提供给信号处理模块,信号处理模块处理完电流信号后,将结果传递给电弧检测控制装置进行检测,电弧检测控制装置在检测到电弧时产生电弧标志,发出切断电路的控制信号,达到对负载的保护。 The method is: the real-time current signal is sampled by the signal sampling means, and the sampling data to the signal processing module, signal processing module after processing the current signals, the detection result to the control unit detects an arc, the arc detection control device When the arc arc generation detection flag control signal emitted cut off the circuit, to protect the load. 本发明的优点在于:在使用电器线路产生断续电弧时,该方法能及时检测到电弧并依靠保护电路切断电源,有效地防止电弧火灾的发生。 Advantage of the present invention is that: When using electrical lines generate intermittent arc, which can promptly detect an arc and rely on the protection circuit cut off power to effectively prevent the occurrence of an arc of fire.
Claims(12)  translated from Chinese
1、故障电弧检测方法,该方法能通过故障电弧保护电路检测到危险电弧,其特征在于包括步骤: 通过信号采样装置(2)实时对电流信号进行采样,并将采样数据提供给信号处理模块; 信号处理模块处理完电流信号,将结果传递给电弧检测控制装置进行检测,电弧检测控制装置为单片机(7),其检测判断是否有故障电弧产生的程序为: (1)单片机进行上电复位,然后到步骤(2); (2)单片机程序初始化,此时所有标志位为0,模拟信号转换为数字信号对应的数值AD为AD0,A/D转换信号采样从单片机的一个引脚输入,然后到步骤(3); (3)单片机判断A/D转换是否完成,当没有新AD值产生时,A/D转换完成标志为0,并继续判断是否新的AD值产生;当有新的AD值产生时,A/D转换完成标志为1,并记下新的AD值AD1,然后到步骤(4); (4)单片机清零A/D转换完成标志,并且比较AD1值和AD0值,不相等到步骤(5),相等则到步骤(8); (5)单片机自动更新AD值,用当前AD值AD1替换已有的AD值AD0,然后到步骤(6); (6)单片机检测电弧标志,当电弧标志为0时,转到步骤(14);当电弧标志为1时,到步骤(7); (7)单片机发出切断电源的控制信号; (8)单片机检测发现电弧标志,当发现电弧标志为0时转到步骤(9),当发现电弧标志为1时转到步骤(10); (9)保存此刻时间,记为T1,置位发现电弧标志,即发现电弧标志为1,然后到步骤(10); (10)单片机检测电弧标志,当电弧标志为0时到步骤(11),当电弧标志为1时转到步骤(13); (11)第一次时间判断,用当前时间T2减去电流波形移位开始时间T1,得时间差TS1,当TS1大于设定值T设1时转到步骤(12),小于设定值T设1时转到步骤(3); (12)置位电弧标志,即电弧标志为1,然后到步骤(13); (13)第二次时间判断,用当前时间T3减去电流波形移位开始时间T1,得一时间差TS2,当TS2大于设定值T设2时转到步骤(14),小于设定值T设2时转到步骤(3); (14)将所有的标志清零,并转到步骤(3); 当单片机(7)检测到电弧时,产生电弧标志。 1, arc fault detection method by arc fault protection circuit detects dangerous arcing, comprising the steps of: (2) real-time current signal is sampled by the signal sampling means, and the sampling data to the signal processing module; signal processing module processed current signal passes the results to the control unit detects an arc detection, the arc detection control unit for the microcontroller (7), to determine whether there are procedures for detecting arcing faults: (1) single-chip power-on reset, then step (2); (2) single-chip initialization, then all flags to 0, the analog signal into a digital signal corresponding to the value of AD is AD0, A / D conversion signals sampled from a microcontroller pin, then to step (3); and (3) SCM judge A / D conversion is complete, when no new value generating AD, A / D conversion completion flag to 0 and continue to determine whether the new AD value generated; when new AD When the value of the produce, A / D conversion completion flag is 1, and note the new AD value AD1, and then to the step (4); (4) MCU clears A / D conversion completion flag, and compare values AD1 and AD0 value, is not equal to the step (5), it is equal to step (8); (5) SCM AD value is automatically updated with the current AD value to replace the existing AD value AD1 AD0, then step (6); (6) single-chip detection arc sign, when the arc flag is 0, go to step (14); when the flag is 1 arc, to step (7); (7) off the power to issue control signals microcontroller; (8) SCM detected arc flag, When they find the arc flag is 0, go to step (9), when the flag is to find the arc step 1 (10); (9) to save time at the moment, referred to as T1, set arc found signs that found signs of an arc 1, and then to step (10); (10) SCM detect an arc sign, when the arc flag is 0:00 to step (11), when the arc flag is 1, go to step (13); (11) the first time to judge , with the current time minus the current waveform T2 shift starting time T1, the time difference was TS1, TS1 is greater than when the step is set to 1 when the set T (12) value to less than the set value T set at step 1 (3) ; (12) Arc flag is set, i.e., an arc of a flag, and then to step (13); (13) a second time to judge, with the current time minus the current waveform T3 shift starting time T1, to obtain a time difference TS2, When TS2 is greater than the set value T set 2:00 to step (14), less than the set value T set to steps 2 (3); (14) all the flags are cleared, and go to step (3); When the microcontroller (7) detects an arc, arcing flag.
2、 根据权利要求1所述的故障电弧检测方法,其特征在于:信号釆样装置(2)采样的信号为电流波形。 2. The arc fault detection method according to claim 1, characterized in that: the signal samples preclude means (2) for the sampled current waveform signal.
3、 根据权利要求1所述的故障电弧检测方法,其特征在于:信号处理模块对电流波形进行处理。 3, arc fault detection method according to claim 1 or claim 2, wherein: a signal processing module for processing the current waveform.
4、根据权利要求1所述的故障电弧检测方法,其特征在于:电弧检测控制装置(7)对处理的电流波形进行判断、检测。 4. The arc fault detection method according to claim 1, characterized in that: the arc detection control means (7) for processing the current waveform judge detected.
5、 根据权利要求1所述的故障电弧检测方法,其特征在于:单片机(7)检测、判断电流波形的程序包括中断程序:设置一时间段T,每隔时间T,程序就会自动定时中断,中断后重新计时。 5. The arc fault detection method according to claim 1, wherein: the microcontroller (7) is detected, the program determines the current waveform interrupt program comprises: setting a period of time T, at intervals of time T, the timer interrupt program will automatically re-timer interrupt.
6、 根据权利要求1所述的故障电弧检测方法,其特征在于:单片机(7)检测、判断电流波形的程序包括中断程序:A/D转换完成中断,单片机保存电流值,置位A/D转换完成标志。 6. The arc fault detection method as claimed in claim 1, characterized in that: the microcontroller (7) detection and determination of the current waveform interrupt routine procedures include: A / D conversion complete interrupt, the device maintains the current value, set bit A / D conversion complete flag.
7、 故障电弧保护电路,包括电源部分,其特征在于:所述的故障电弧保护电路还包括信号采样装置(2)、信号处理模块、电弧检测控制装置(7)和切断电源模块,所述的信号釆样装置(2)为带铁芯的电流互感器;所述的信号处理模块依次连接了全波二极管整流桥(3)、分压电阻Ri (4)和R3 (5);所述的电弧检测控制装置(7) 为单片机;所述的切断电源模块依次连接了三极管(10)和执行机构部分(9)。 7, arc fault protection circuits, including power supply section, wherein: arc fault protection circuit further comprises a signal sampling device (2), a signal processing module, the arc detection control unit (7) and cut off the power supply module, said Bian-like signal means (2) with a core of a current transformer; said signal processing module sequentially connected full-wave diode rectifier bridge (3), voltage dividing resistors Ri (4) and R3 (5); wherein arc detection control means (7) for the microcontroller; said turn off the power module connected to the transistor (10) and the actuator section (9).
8、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为常闭触点继电器。 8. The arc fault protection circuit of claim 7, wherein: said actuator section (9) is a normally closed contact relays.
9、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为常开触点继电器。 9, according to claim 7, wherein the arc fault protection circuit, characterized in that: the actuator portion (9) is normally open relay contacts.
10、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为上电脱扣器。 10. The arc fault protection circuit of claim 7, wherein: said actuator section (9) of the power trip.
11、 根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为断电脱扣器。 11, according to claim 7, wherein the arc fault protection circuit, characterized in that: the actuator portion (9) for the power trip.
12、根据权利要求7所述的故障电弧保护电路,其特征在于:所述的执行机构部分(9)为可控硅。 12, according to claim 7, wherein the arc fault protection circuit, characterized in that: the actuator section (9) of the SCR.
Description  translated from Chinese

故障电弧检测方法及其保护电路技术领域本发明涉及一种故障电弧检测方法及其保护电路,特别涉及一种能检测到危险电弧并自动切断电源的故障电弧保护电路。 Arc fault detection methods and relates to an arc fault detection and protection circuit protection Technical Field The present invention particularly relates to an arc fault protection circuit can detect dangerous arcing and automatically cut off power supply. 背景技术近年来,随着家用电器的普及,电气火灾呈上升趋势,其中故陣电弧(电弧、电火花)是引起电气火灾的主要原因。 In recent years, with the popularity of home appliances, electrical fires upward trend, so the array arc (arc, spark) is the main cause of electrical fires. 故障电弧可以分短路电弧和接触不良电弧。 Arc fault can be divided into short circuiting arc and poor contact arcing. 短路电弧是由电路相线之间、相线零线之间、相线地线之间短路引起的大电流产生的电弧。 Short circuit arc between circuit phase by phase line between the zero line, arc large current generation caused by short-circuit between phase ground. 其中短路电弧又可分为持续短路电弧、断续短路电弧。 Which can be divided into continuous short circuit arc short circuit arc, intermittent short circuit arc. 持续短路电弧弓I起火灾的特点是短路电弧能在瞬间产生高温,引起周围易燃物瞬间燃烧;断续短路电弧引起火灾的特点是断续短路电弧持续的时间短,但是能在一段时间内持续产生电弧,引起周围温度持续升高,从而引起周围易燃物燃烧。 I bow sustained short circuit arc fires are characterized by short circuiting arc can produce high temperature in an instant, causing surrounding combustible instantaneous combustion; intermittent short circuit caused by the characteristics of the arc of fire was intermittent short circuit arc of short duration, but can within a period of time continuous arc, causing the ambient temperature continues to rise, causing the surrounding combustion of inflammable materials. 接触不良电弧是由于负载设备的接线端子松动等引起的接触不良产生的电弧。 Arc is an arc due to poor contact terminals load equipment caused by loose contact failure generated. 接触不良电弧弓I起火灾的特点是接触不良电弧能在一段时间内,持续产生电弧,弓l起周围温度持续升高,从而引起周围易目前,电气线路的过流、漏电、过压保护只能对持续短路电弧起到保护作用,而对其他的电弧不一定能起到保护作用。 I bow to poor contact arcing fires are characterized by poor contact arcing energy over a period of time, continuous arcing bow l ambient temperature continues to rise, causing around easily now, electrical circuit overcurrent, leakage, overvoltage protection only capable of sustained short-circuit the arc play a protective role, while the other arc does not necessarily play a protective role. 当前已有的故障电弧保护装置,主要针对电力线路中出现的故障电弧,其特征是瞬间产生的大电流持续放电产生的电弧。 The current conventional arc fault protection devices, mainly for power lines arcing fault occurs, wherein the arc current moment discharge generated from continuing. 对于电器线路中出现的故障电弧,如接触不良、小电流短路产生的断续的故障电弧,还没有可靠的保护。 For electrical arc fault lines appear, such as poor contact, intermittent short circuit arc fault currents generated by small, there is no reliable protection. 因此对于断续故障电弧引起的电气火灾的保护还存在很大的缺陷。 So there is a big flaw for intermittent arc fault protection due to electrical fires. 发明内容本发明提供了一种当被保护线路中出现断续电弧时能检测到危险电弧并自动切断电路的故障电弧检测方法及其保护电路。 The present invention provides an intermittent arc when the protected circuit to detect when a dangerous arc and arc fault detection circuit automatically cut off its protection circuit. 当在被保护的线路中出现断续故障电弧时,该方法能及时检测到电弧并在其弓I 起电气火灾前切断电源,从而避免火灾或重大事件的发生,达到对电器的保护。 When the intermittent arc fault in the protected circuit, the method can detect the arc and in a timely manner before its bow I fire off electrical power to avoid the occurrence of fires or major incidents, achieve electrical protection. 实现本发明的技术方案-故障电弧检测方法,该方法能通过故障电弧保护电路检测到危险电弧,其特征在于包括步骤:通过信号采样装置实时对电流信号进行采样,并将采样数据提供给信号处理模块;信号处理模块处理完电流信号,将结果传递给电弧检测控制装置进行检测,当电弧检测控制装置检测到电弧时,产生电弧标志。 Implementation of the present invention, the technical solution - arc fault detection method by arc fault protection circuit detects dangerous arcing, comprising the steps of: sampling a current signal in real time via the signal sampling means, and the sampling data to the signal processing module; signal processing module processed current signal passes the results to the arc detection control unit detects, when the arc detection control unit detects an arc, arcing flag. 其中:所述的信号采样装置采样的信号为电流波形; 所述的信号处理模块对电流波形进行处理;所述的电弧检测控制装置对处理后的电流波形进行判断、检测。 Wherein: signal sampling means for sampling the current waveform signal; the signal processing module for processing the current waveform; said arc detecting means for controlling the current waveform judge treated, detection. 故障电弧保护电路,包括电源部分,其特征在于:所述的故障电弧保护器还包括信号采样装置、信号处理模块、电弧检测控制装置和切断电源模块;所述的信号采样装置为带铁芯的电流互感器;所述的信号处理模块依次连接了全波二极管整流桥、分压电阻Ri和R3;所述的电弧检测控制装置为单片机;所述的切断电源模块依次连接了三极管和执行机构部分。 Arc fault protection circuit, including power part, characterized by: arc fault protection device further comprises a signal sampling device, a signal processing module, arc detection controls and cut off the power supply module; signal sampling device for the band said core current transformer; a signal processing module in turn is connected to a full-wave diode rectifier bridge, voltage divider resistors Ri and R3; arc detection control means for the microcontroller; said turn off the power module connected to the transistor and actuator section . 所述的执行机构部分为常闭触点继电器。 The actuator portion normally closed contact relays. 所述的执行机构部分为常开触点继电器。 The actuator portion normally open contact relay. 所述的执行机构部分为上电脱扣器。 Actuator portion of the power trip. 所述的执行机构部分为断电脱扣器。 Actuator portion of the trip is off. 所述的执行机构部分为可控硅。 Actuator portion of the SCR. 本发明的优点是:在电器上使用的时候,线路产生断续电弧时, 能及时检测到电弧并切断电源,有效地防止电弧火灾的发生。 Advantages of the present invention are: when used in the electrical, the line produces intermittent arc, the arc is detected in time and cut off the power to effectively prevent the occurrence of an arc of fire. 附图说明图1是本发明执行机构部分为常闭触点继电器和上电脱扣器的图2是本发明执行机构部分为常开触点继电器和断电脱扣器的电路原理图。 Figure 1 is a part of the implementation mechanism of the present invention is a normally closed contact relay and power-tripping of Figure 2 is part of the implementation mechanism of the present invention is a normally open contact relays and power tripping a circuit schematic. 图3是本发明执行机构部分为可控硅电路原理图。 Figure 3 is a part of the implementation mechanism of the present invention, the SCR circuit diagram. 图4是单片机对处理的电流波形进行判断、检测的流程图。 Figure 4 is a single-chip current waveform processing to judge flowchart detection. 图5、图6是单片机程序中断的流程图。 FIGS. 5 and 6 is a flowchart MCU program interruption. 具体实施方式实施例l:如图1所示,被保护的电路由AC220V输入端8输入220V交流电压,经故障电弧保护电路的常闭触点继电器9,由AC220V输出端ll输出。 DETAILED DESCRIPTION Embodiments Example l: 1, a protected circuit from input 8 input AC220V 220V AC voltage, the arc fault protection circuit normally closed contact relays 9, AC220V output from the output terminal ll. 被保护线路连接该故障电弧保护电路,直流电源VCC为故障电弧保护电路提供电源。 The protected line connecting the arc fault protection circuit, the DC power supply VCC provides power for arc fault protection circuitry. 电路正常时,电流耳感器2检测到的波形为连续的负载电流波形;当电路有电弧产生时,由于电流互感器2的特性,使电流互感器2检测到的电流波形有移位。 Circuit is normal, the current ear sensor 2 detected waveform as a continuous load current waveform; when the circuit has arcing, since the characteristics of the current transformer 2 so that the current transformer 2 detected current waveform has shifted. 电流互感器2检测穿过其的被保护线路中的交流电流信号,然后将检测到的电流波形信号由全波整流桥3整流,并且由电阻Ri4和R35分压后变为直流信号,然后将该直流信号输入到单片机7,单片机7通过比较前后采样电流的AD值,AD值是指模拟信号转为数字信号对应的数值,来判断电流波形是否有移位现象,从而判断是否有故障电弧。 Current transformer 2 detected through its protected lines alternating current signal, then the detected current waveform signal by a full wave rectifier bridge rectifier 3, and by the resistance Ri4 and R35 after dividing into a DC signal, and then the The DC signal input to the microcontroller 7, the microcontroller 7 through before and after sampling the current AD value, AD value refers to an analog signal to digital signal corresponding to the value, to determine whether the current waveform shifting phenomenon, in order to determine whether the fault arc. 当没有检测到故障电弧时,单片机7发出低电平信号,三极管10是截止的,电源通过常闭触点继电器9为被保护的电器提供工作电压;当检测到被保护电路中有故障电弧产生时,单片机7发出高电平控制信号,使得三极管10导通,此时位于集电极的常闭触点继电器9断开,实现切断电源,达到对电路的保护,避免电气火灾的发生。 When no fault is detected arc, the microcontroller 7 a low signal, the transistor 10 is off, the power supply through a normally closed contact relay 9 provides the operating voltage is a protected electrical appliances; when it detects a fault in the protected circuit arc , the microcontroller 7 issue high-level control signal so that the transistor 10 turns on, then located off NC contact relay 9 collector to achieve cut off power to the circuit to achieve protection against electrical fires. 当故障电弧排除后,电源通过电阻R26重新对故障保护电路通电复位,单片机重新开始工作。 When the fault arc to exclude, power supply through resistor R26 to re-energize the fault protection circuit microcontroller reset back to work. 如图4、图5、图6所示,单片机的工作流程如下: (1)单片机进行上电复位,单片机上电后,电源VCC经过电阻R2,至单片机引脚使单片机复位,然后到步骤(2);(2) 单片机程序初始化,此时所有标志位为0,模拟信号转换为数字信号对应的数值AD为ADo, A/D转换信号采样从单片机的一个引脚输入,然后到步骤(3);(3) 单片机判断A/D转换是否完成,当没有新AD值产生时,A/D 转换完成标志为O,并继续判断是否新的AD值产生;当有新的AD值产生时,A/D转换完成标志为1,并记下新的AD值ADi,然后到步骤(4);(4) 单片机清零A/D转换完成标志,并且比较ADi值和ADo值, 不相等则到步骤(5),相等则到步骤(8);(5) 单片机自动更新AD值,用当前AD值ADi替换已有的AD值AD0,然后到步骤(6);(6) 单片机检测电弧标志,当电弧标志为0时,转到步骤(14);当电弧标志为l时,到步骤(7);(7) 单片机发出切断电源的控制信号;(8) 单片机检测发现电弧标志,当发现电弧标志为0时转到步骤(9),当发现电弧标志为1时转到步骤(10);(9) 保存此刻时间,记为Tl,置位发现电弧标志,即发现电弧标志为l,然后到步骤(10);(10) 单片机检测电弧标志,当电弧标志为O时到步骤(11),当电弧标志为1时转到步骤(13);(11) 第一次时间判断,用当前时间T2减去电流波形移位开始时间Tl,得时间差Tsi,当TS1大于设定值T设i时转到步骤(12), 小于设定值T设i时转到步骤(3);(12) 置位电弧标志,即电弧标志为l,然后到步骤(13);(13) 第二次时间判断,用当前时间T3减去电流波形移位开始时间Tl,得一时间差Ts2,当Ts2大于设定值T设2时转到步骤(14), 小于设定值T设2时转到步骤(3);(14) 将所有的标志清零,并转到步骤(3);单片机是定时采样,当以下两种方式中有一种出现时,单片机中断工作,执行中断程序,然后再继续从中断的地方继续工作。 Figures 4, 5, 6, SCM workflow is as follows: (1) single-chip power-on reset, the microcontroller power, the power supply VCC via a resistor R2, to the microcontroller pins and reset the device, then step ( 2); (2) single-chip initialization, then all flags to 0, the analog signal into a digital signal corresponding to the value of AD is ADo, A / D conversion signals sampled from a microcontroller input pin, and then to step (3 ); and (3) SCM judge A / D conversion is complete, when no new value generating AD, A / D conversion completion flag is O, and continue to determine whether the new AD value generated; when a new AD value generated, A / D conversion completion flag is 1, and note the new AD value ADi, and then to the step (4); (4) MCU clears A / D conversion completion flag, and the value and compare ADi ADo value, not equal to Step (5), are equal to step (8); (5) SCM AD value is automatically updated with the current AD value ADi replace the existing AD value AD0, then step (6); (6) SCM detect an arc sign, When the arc flag is 0, go to step (14); when the arc flag is l, to step (7); (7) off the power to issue control signals microcontroller; (8) SCM detected arc flag, when found in an arc Go to step flag is 0 (9), when the flag is to find the arc step 1:00 (10); (9) to save time at the moment, denoted by Tl, set arc found signs that found signs of an arc l, then to step (10); (10) SCM detect an arc sign, when the arc flag is O when to step (11), when the arc flag is 1:00 to step (13); (11) the first time to judge, with the current Time T2 minus current waveform shift start time Tl, have time difference Tsi, when TS1 is greater than the set value when T set to step i (12), less than the set value when T set to step i (3); (12 ) set arc sign that the arc symbol for l, then step (13); (13) second time to judge, with the current time minus the current waveform T3 shift start time Tl, have a time difference Ts2, when more than Ts2 When the set value T set to step 2 (14), less than the value set to step time T 2 (3); (14) all the flags are cleared, and go to step (3); SCM is a timing sampling, when there is a two ways occurs, the interrupt working, execute the interrupt routine, and then continue to work from where it left off. (1) 定时中断,设置一时间段T,每隔时间T,程序就会自动定时中断,中断后再重新计时;(2) A/D转换完成中断,保存电流值,置位A/D转换完成标志, 即A/D转换完成标志为l。 (1) The timer interrupt, set a time period T, every time T, the program will automatically timer interrupt, the interrupt and re-timing; (2) A / D conversion complete interrupt, saving the current value, set bit A / D converter completion flag, the A / D conversion completion flag is l. 实施例2:本实施例与实施例1最大的不同在于:执行机构部分为常开触点继电器。 Example 2: This Example is an embodiment that the biggest difference: the actuator portion normally open contact relay. 当判断无电弧故障时,单片机7控制输出引脚置为高电平使三极管10导通,位于集电极的常开继电器9吸合,电源通过闭合的继电器给电路供电,保护电路正常运行;当判断出有故障电弧时,单片机7会发出低电平控制信号,使得三极管10截止,此时常开触点继电器9断开,实现切断电源,达到对电路的保护。 When it is determined no arc fault microcontroller 7 controls the output pin is high the transistor 10 is turned on, the normally open relay is located in the collector 9 pull the power supply to the circuit through the closed relay power protection circuit the normal operation; when When it is decided that arc fault microcontroller 7 will send low-level control signal so that the transistor 10 off, then disconnect the normally open contact relay 9 to achieve off the power, reach circuit protection. 实施例3:本实施例与实施例1最大的不同在于:执行机构部分为上电脱扣器。 Example 3: Example 1 of the present embodiment embodiment is that the biggest difference: the actuator portion of the power trip. 当判断无电弧故障时,单片机7控制输出引脚置为低电平,三极管10截止,位于三极管集电极的上电脱扣器9闭合,电源通过闭合的脱扣器供电,电路正常运行;当判断出有故障电弧时,单片机7会发出高电平控制信号,使得三极管IO导通,此时上电脱扣器9断开, 实现切断电源,达到对电路的保护。 When it is determined no arc fault microcontroller 7 controls the output pin is low, the transistor 10 is turned off, is located on the power transistor collector release 9 is closed, release the power supply through the closed circuit running; when When it is decided that arc fault microcontroller 7 will send high-level control signal so that the transistor IO turns on, then release 9 Disconnect the power to achieve off the power, reach circuit protection. 实施例4:本实施例与实施例1最大的不同在于:执行机构部分为断电脱扣器。 Example 4: This Example is an embodiment that the biggest difference: the actuator portion of power trip. 当判断无电弧故障时,单片机7控制输出引脚置为高电平使三极管10导通,位于集电极的断电脱扣器9闭合,电源通过闭合的脱扣器给电路供电,保护电路正常运行;当判断出有故障电弧时,单片机会7发出低电平控制信号,使得三极管10截止,此时断电脱扣器9 断开,实现切断电源,达到对电路的保护。 When it is determined no arc fault microcontroller 7 controls the output pin is high the transistor 10 is turned on, located off the trip collector 9 is closed, the power to release through the closed circuit supply protection circuit is normal run; when it is judged arc fault microcontroller 7 will send out low-level control signal so that the transistor 10 off, then disconnect the power release 9, to achieve off the power, reach for circuit protection. 实施例5:本实施例与实施例1最大的不同在于:执行机构部分为可控硅。 Example 5: This Example is an embodiment that the biggest difference: the actuator portion of the SCR. 当判断无电弧故障时,单片机7控制输出引脚置为低电平,使得三极管10截止,光耦13和光耦16导通,可控硅9和可控硅17导通,电源通过导通的可控硅给电路供电,电路正常运行;当判断出有故障电弧时,单片机7会发出高电平控制信号,三极管10导通,使得光耦13和光耦16截止,可控硅9和可控硅17断开,实现切断电源,达到对电路的保护。 When it is determined no arc fault microcontroller 7 controls the output pin is low, so that the transistor 10 is turned off, the optocoupler 13 and 16 optocoupler conduction, SCR 9 and SCR 17 is turned on, the power is turned on by SCR power supply to the circuit, the circuit running; when it is judged that there is an arc fault microcontroller 7 will send high-level control signal, the transistor 10 is turned on so optocoupler optocoupler 13 and 16 off, SCR 9 and controllable Silicon 17 turning off, cut off power to the circuit to achieve protection.

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Classifications
International ClassificationH02H3/26, G01R31/00, G01R19/00, G01R31/08
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