CN203787934U - Multifunctional fireproof short-circuit protector equipped with redundant device - Google Patents

Abstract

The utility model relates to the technical field of an electric short-circuit protection device, in particular to a multifunctional fireproof short-circuit protector equipped with a redundant device. The multifunctional fireproof short-circuit protector mainly comprises a switch power source, a current sampling device, a digital signal processor, a large-current power module, an isolation driving module, a redundant device, an electric charge absorption circuit and a load; the redundant device is a controlled mechanical switch; an end L of a 220V alternating-current power is respectively connected with a resistor R1, an input end of the switch power source, an input end of a differential amplifier and one end of the current sampling device. The multifunctional fireproof short-circuit protector is used in different alternating-current strong current places such as household power utilization, industrial power utilization places and the like; when the load is short-circuited, an abnormal power supply circuit is disconnected instantaneously at a microsecond speed, and no dangerous spark is produced on a short-circuit position; when abnormal situations such as electric leakage happen in an electrical loop, an electric-leakage circuit is also disconnected at a high speed by the device; because the device is equipped with the redundant device, even when the extreme situation that the large-power current module or the digital signal processor is abnormal or other extreme situations occur, the reliability of the device also can be guaranteed.

Description

Multifunctional fire-proof short-circuit protector with redundant apparatus

Technical field:

The utility model relates to electric short circuit protection equipment technical field, is specifically related to the multifunctional fire-proof short-circuit protector with redundant apparatus.

Background technology:

In recent years, along with Chinese national economy rapid growth, living standards of the people improve constantly, society keeps increase year after year to the demand of electricity consumption, and each occasions such as household electrical appliance, agricultural, industry nearly all be unable to do without electric energy; Under the ever-increasing background of need for electricity amount, how to guarantee that the problems such as safety utilization of electric power are also thereupon outstanding, according to incompletely statistics, after a lot of fire accident investigations, find, the electrical fire causing because of electric short circuit, electric leakage, arcing occupies the primary factor that accident causes always, bring safely serious threat to the people's lives and property, count with property necessarily conventionally because moment after electric fault initiation fire turns to dust and ashes; Therefore, how to guarantee safety utilization of electric power more, avoid the people's lives and property to incur loss safely becoming urgent problem.

The circuit breaker that we know, air switch occupies our daily electricity consumption as the leading position of short circuit overload protection always, circuit breaker or air switch are series in load circuit, during normal use, its mechanical contact is connected, load circuit obtains electric normal work, when load short circuits or overload, the induction coil of circuit breaker inside starts because short circuit obtains enough strong magnetic field the Mechanical Contact point separation rapidly that internal mechanical valve makes to be connected on electric loop, effectively cut off fault current, according to the difference of circuit breaker theory structure, some circuit breaker also adopts the different principle of the coefficient of expansion of bimetal leaf to realize separation of fault current mechanical contact etc., final all can reaching disconnects the object that mechanical contact carrys out disjunction fault current.

Conventional circuit breaker from time of being short-circuited to fault current disjunction conventionally at tens of milliseconds between hundreds of milliseconds, at short dot, easily cause larger dangerous spark, at a lot of Different high risk sites (as gas station, greasy dirt around serious kitchen, hotel, combustibles), very easily cause the generation of security incident.

For making up the drawbacks such as overlong time of mechanical type circuit breaker or air switch open failure electric current, some company High-speed Electric minor short-circuit protector that begun one's study in recent years, its super-current power unit all adopts semiconductor to carry, due to its power device circuit form reason adopting, can cause the quantity of power device significantly to increase, when being used, reality can produce very large power consumption, therefore loaded current can not be accomplished very large, wherein, the circuit structure of a kind of power device as shown in Figure 1: because alternating current 220V has positive-negative half-cycle, when positive half cycle arrives, A tube grid applies opens signal, A manages conducting, power diode conducting with A pipe string connection, positive half cycle voltage is applied to load, now no matter whether the grid of B pipe applies, open signal due to the single-phase conductivity of diode with B pipe string connection, therefore at positive half cycle, constantly in B pipe, do not have electric current to flow through, in like manner, the moment B pipe conducting that negative half period arrives, A manages cut-off, AB pipe carries respectively positive-negative half-cycle electric current, obtains approaching the sinusoidal voltage consistent with civil power in load, as shown in fig. 1, because single A pipe or B pipe cannot carry larger load current, thereby while needing the electric current of carrying to increase, certainly will to increase the quantity of A, B pipe, the diode of while and A, B pipe string connection also can be multiplied, and causes the volume of whole device to increase, therefore due to the conduction voltage drop of high-voltage diode, can not accomplish very littlely in addition, the circuit structure of above-mentioned Fig. 1 can face in large current applications that oneself power consumption increases, the serious drawback of generating heat, and is unfavorable for the reliability and stability of device.

Also some adopts bidirectional triode thyristor as super-current power unit, because the fixed pressure drop of bidirectional triode thyristor exists, generally more than 1V, according to W=I * V, if load current surpasses 10A, can at least produce the power consumption of 10W, oneself power consumption too conference causes the heating of bidirectional triode thyristor serious, this characteristic limitations its volume miniaturization, thereby be not suitable for using in the slightly large occasion of electric current.

In recent years along with the development of semiconductor technology, the new units such as the large current power semiconductor of electric power constantly come out, as GTO(Gate Turn Off Thyristor), IGCT (Integrated Gate Commutated Thyristor) etc., it not only can carry hundreds of to thousands of peaces electric current doubly, the characteristic simultaneously with quick shutoff, it is power industry main developing direction in the future, present stage because of the time that device comes out not long, expensive, therefore only limit at present super-large current carrying place application.

In the known high speed short-circuit protector product similar with the utility model, the current sample device in circuit is mainly taked following two kinds: 1, current transformer; 2, hall device; While adopting current transformer and hall device as the current sample device of high speed short-circuit protector, the delay that all can cause in current signal transmittance process due to the characteristic of device itself, general hall device time of delay can be even larger at 5uS, and its propagation delay time of current transformer can be longer, if due to the difference of process materials, the propagation delay time cannot guarantee; And the identification of short-circuit signal, the delay time of current sample device is longer, and the whole time to fault current disjunction from short circuit occurs constantly is elongated, and this spark that means short dot is larger; Due to the capacity limit of hall device, in the occasion of large current sample, mean that cost can significantly increase, and also there is magnetically saturated phenomenon in current transformer, if need to accomplish to detect large electric current, what volume also can phase strain is huge.

In the known high speed short-circuit protector product similar with the utility model, disjunction short-circuit current mainly relies on super-current power unit cutting-off of short-circuit electric current, once there are puncturing abnormal conditions in high-current semiconductor power device, product has just lost basic defencive function, when Different high risk sites is used, can because installing fault own, cause the possibility of peril, install inner irredundant backup design; When there is the worst situation, super-current power unit cannot play basic defencive function owing to puncturing.

In the known high speed short-circuit protector product similar with the utility model; because electric charge absorbing circuit is not taked in device inside; when the occasion of inductive load short circuit occurs; because the high speed of super-current power unit in device is cut off; can cause at inductive load two ends very strong induced electromotive force; because short circuit contact point exists contact resistance, also can cause powerful short circuit risk spark in short circuit place, then cause the possibility of security incident.

In the known high speed short-circuit protector product similar with the utility model, due to additional functions such as the detection of inactivity factor, electric energy detection, electric leakage interfaces, thereby make the function singleness of product.

Utility model content:

The drawbacks such as existing machinery formula circuit breaker or air switch break-time are long in order to make up, the dangerous spark of short circuit generation is excessive, the utility model provides a kind of multifunctional fire-proof short-circuit protector with redundant apparatus.

Multifunctional fire-proof short-circuit protector with redundant apparatus described in the utility model, comprise Switching Power Supply, current sampling device, digital signal processor, high-current power module, isolation drive module, redundant apparatus, electric charge absorbing circuit and load, described redundant apparatus is controlled mechanical switch, the L end of alternating current 220V respectively with the input of resistance R 1, described Switching Power Supply, the input of differential amplifier is connected with one end of current sampling device, the N of described alternating current 220V holds respectively with one end of resistance R 2, one end of the input of described Switching Power Supply, electric charge absorbing circuit is connected with load, the other end of described resistance R 2 is connected with described digital signal processor with one end of resistance R 3 respectively, the equal ground connection of the other end of the other end of described resistance R 3 and resistance R 1, the output of described Switching Power Supply is connected with the input of described differential amplifier, and the output of described differential amplifier is connected with described digital signal processor by the first photoelectrical coupler, the other end of described current sampling device is connected with one end of described high-current power module, described isolation drive module is connected with digital signal processor with one end of described high-current power module respectively, the other end of described high-current power module is connected with load with described electric charge absorbing circuit respectively by described controlled mechanical switch, described electric charge absorbing circuit is connected in parallel on the two ends of described load, one end of described controlled mechanical switch coil is connected with described digital signal processor with resistance R 5 by triode Q1 successively, the other end of described controlled mechanical switch coil is connected with power supply VCC and by the second photoelectrical coupler, is connected with described digital signal processor with resistance R 6 successively, described the second photoelectrical coupler is connected with described electric charge absorbing circuit.

As preferably, described digital signal processor is connected with creepage mutual inductor input module, LCD MODULE, RS485 bus interface, keyboard input module and LED indication/buzzer respectively.

As preferably, described current sampling device is accurate low-resistance noninductive resistance.

As preferably, described high-current power module adopts high-power MOSFET differential concatenation structure.

As preferably, described digital signal processor is built-in with electric leakage algoritic module.

As preferably, described fire prevention short-circuit protector adopts Phase synchronization detection technique and polyalgorithm judgment technology.

The utility model adopts the current signal of accurate low-resistance noninductive resistance sampling after high speed differential amplifier amplifies, by high speed the first photoelectrical coupler, enter digital signal processor, the digital signal processor input voltage of simultaneously sampling obtains the accurate synchronous phase signal without time delay, through digital signal processor internal interference, suppress, FFT conversion, a series of multinomial complex calculation such as slope computing, when digital signal processor recognizes after true property short-circuit signal, send and control signal to isolation drive module, utilize the quick turn-off characteristic of MOSFET high-current power module, isolation drive module instantaneous trip within the time of several microseconds is connected on the MOSFET high-current power module in load circuit, meanwhile: digital signal processor and controlled mechanical switch control output end output signal, the coil that is connected in controlled mechanical switch obtains electric, is connected on the controlled mechanical switch disjunction in load circuit, realizes the physical separation of electric loop, the control end output signal of the electric charge absorbing circuit of digital signal processor now, electric charge absorbing circuit moment opens, and absorbs the residual charge that may exist in self-loop, further reduces the spark of short circuit place, the corresponding LED light being connected with digital signal processor is lighted simultaneously, buzzer is opened, and realizes sound and light alarm, and LCDs shows the details of this short circuit: the moment that short circuit occurs, short circuit breaking time, the details such as fault type, after short trouble is got rid of, by " reset " button in the keyboard input module being connected with digital signal processor, can reclose load path.The utility model and similar electronic type ac short circuit protector, electronic breaker comparison, owing to having adopted high speed digital signal processor and reliable algorithm, the plurality of advantages such as do not judge, the short circuit breaking time significantly shortens by accident;

The beneficial effects of the utility model: the multifunctional fire-proof short-circuit protector with redundant apparatus described in the utility model, mainly comprises Switching Power Supply, current sampling device, digital signal processor, high-current power module, isolation drive module, redundant apparatus, electric charge absorbing circuit and load, wherein, redundant apparatus is controlled mechanical switch, the utility model adopts said structure, first, compare with mechanical type circuit breaker or air switch, the break-time of short circuit current improves thousands of times to tens thousand of times, only produces atomic little spark even can't see cremate in short circuit place, greatly reduces the possibility that security incident occurs, secondly, compare with similar electronic type high speed short-circuit protector, because this device adopts noninductive resistance as current sampling device, and adopt the measures such as electric charge absorbing circuit, electric current and voltage Phase synchronization detection technique and specific algorithm simultaneously, make the time of disjunction short circuit trouble point also than similar electronic type high speed short-circuit protector, improve several times, and can not be subject to the nonlinear characteristic of perception or capacitive load and affect the performance of this device, also there will not be misoperation, then, compare with similar electronic type high speed short-circuit protector, the redundant apparatus of taking due to this device, the controlled mechanical switch described in, even if high-current power module occurs to be punctured, the worst situations such as digital signal processor inefficacy, the controlled mechanical switch of this device not only can rely on the short-circuit protection measure disengagement failure loop carrying, and also disengagement failure loop reliably of the coil magnet valve that is subject to DSP CONTROL, and also disengagement failure loop reliably of the coil magnet valve that is subject to DSP CONTROL, guaranteed the high reliability of this device, again then, compare with similar electronic type high speed short-circuit protector, the high-current power module that this device is used adopts the circuit structure form of differential concatenation, has saved a large amount of external diodes, simple in structure and low in cost, and the micro power consumption of self, finally, compare with similar electronic type high speed short-circuit protector, this device has been expanded the various functions such as detection of electrical leakage input function, power factor (PF) measuring ability, electric weight computing function, RS485 bus interface, realizes unitary device multifunction.In addition, the utility model is used in various interchange forceful electric power places such as household electricity, commercial power, and when load is short-circuited, this device, with the abnormal supply access of speed instantaneous trip of microsecond, does not produce dangerous spark at short dot; While there is the abnormal case such as electric leakage when electric loop, this device also can cut off at a high speed electric leakage path; The redundant apparatus carrying due to this device designs, even if there are extreme abnormal conditions, and also can assurance device reliability.Eventually the above, the utility model can effectively prevent from exchanging the various security incidents that cause because of line short or electric leakage in electricity consumption place.

Accompanying drawing explanation:

For ease of explanation, the utility model is described in detail by following concrete enforcement and accompanying drawing.

Fig. 1 is the electrical block diagram of power device in prior art;

Fig. 2 is electrical block diagram of the present utility model;

Fig. 3 is the view of the utility model embodiment mono-;

Fig. 4 is the view of the utility model embodiment bis-;

Fig. 5 is the view of the utility model embodiment tri-;

Fig. 6 is the view of the utility model embodiment tetra-.

1-Switching Power Supply; 2-current sampling device; 3-digital signal processor; 4-high-current power module; 5-isolation drive module; 6-redundant apparatus; 7-electric charge absorbing circuit; 8-load; 9-differential amplifier; 10-the first photoelectrical coupler; 11-the second photoelectrical coupler; 12-creepage mutual inductor input module; 13-LCD MODULE; 14-RS485 bus interface; 15-keyboard input module; 16-LED indication/buzzer.

Embodiment:

As shown in Figure 2, this embodiment is by the following technical solutions: with the multifunctional fire-proof short-circuit protector of redundant apparatus, comprise Switching Power Supply 1, current sampling device 2, digital signal processor 3, high-current power module 4, isolation drive module 5, redundant apparatus 6, electric charge absorbing circuit 7 and load 8, described redundant apparatus 6 is controlled mechanical switch, the L end of alternating current 220V is connected with one end of current sampling device 2 with the input of resistance R 1, described Switching Power Supply 1, the input of differential amplifier 9 respectively, and the N end of described alternating current 220V is connected with load 8 with one end of resistance R 2, one end of the input of described Switching Power Supply 1, electric charge absorbing circuit 7 respectively, the other end of described resistance R 2 is connected with described digital signal processor 3 with one end of resistance R 3 respectively, the equal ground connection of the other end of the other end of described resistance R 3 and resistance R 1, the output of described Switching Power Supply 1 is connected with the input of described differential amplifier 9, and the output of described differential amplifier 9 is connected with described digital signal processor 3 by the first photoelectrical coupler 10, the other end of described current sampling device 2 is connected with one end of described high-current power module 4, described isolation drive module 5 is connected with digital signal processor 3 with one end of described high-current power module 4 respectively, the other end of described high-current power module 4 is connected with load 8 with described electric charge absorbing circuit 7 respectively by described controlled mechanical switch, described electric charge absorbing circuit 7 is connected in parallel on the two ends of described load 8, one end of described controlled mechanical switch coil is connected with described digital signal processor 3 with resistance R 5 by triode Q1 successively, the other end of described controlled mechanical switch coil is connected with power supply VCC and by the second photoelectrical coupler 11, is connected with described digital signal processor 3 with resistance R 6 successively, described the second photoelectrical coupler 11 is connected with described electric charge absorbing circuit 7.

Wherein, as shown in Figure 2, described digital signal processor 3 is connected with creepage mutual inductor input module 12, LCD MODULE 13, RS485 bus interface 14, keyboard input module 15 and LED indication/buzzer 16 respectively; Wherein above-mentioned each module or interface all can be used for the various functions such as networking or interlock, have realized the multifunction of unitary device.

As shown in Figure 2, described current sampling device 2 is accurate low-resistance noninductive resistance; In the present embodiment, the object of design is to guarantee that signal is undistorted in sampling process like this, without delay phenomenon.

As shown in Figure 2, described high-current power module 4 adopts high-power MOSFET differential concatenation structure; The object of design is to make high-current power module 4 be responsible for respectively carrying positive-negative half-cycle current path like this, and electronic breaker similar with other, electronic short circuit protector are compared, and have saved several extra single-phase large current diodes, have saved cost.

As shown in Figure 2, described digital signal processor is built-in with electric leakage algoritic module; Wherein, creepage mutual inductor input module 12 is connected with electric leakage algoritic module, detection of electrical leakage instrument transformer that like this can compatible various different models, and the occasion of the dropout of detecting electric leakage when needed, is further expanded function of the present utility model.

As shown in Figure 2, described fire prevention short-circuit protector adopts Phase synchronization detection technique and polyalgorithm judgment technology; Can guarantee that like this this device can not judge by accident, improve from short circuit occurs to the time that short circuit current cuts off simultaneously, further reduce the dangerous spark of short circuit place.

As shown in Figure 3, alternating current 220V power supply enters the input of Switching Power Supply 1, two groups of low-voltage dc voltages through isolation are exported in conversion through Switching Power Supply 1, one group to high speed differential amplifier 9 and the first photoelectrical coupler 11 power supplies at a high speed, other one group of all system power supply of giving other, Switching Power Supply 1 function in following all legends is all the same, therefore at following all chapters and sections or in describing, no longer repeats.

Embodiment mono-: as shown in Figure 3, wherein, during the normal work of this device, the signal of accurate low-resistance noninductive resistance is sent into digital signal processor 3 after the first photoelectrical coupler 11 isolation, digital signal processor 3 information such as input voltage phase of simultaneously sampling, through digital signal processor, 3 internal arithmetics are processed, when load 8 is not short-circuited or transships abnormal case, digital signal processor 3 sends closure signal to isolation drive module 5, driver module is opened high-current power module 4, the passage open of high-current power module 4; Because digital signal processor 3 to the coil path of controlled mechanical switch is under normal circumstances failure to actuate, and the short circuit mechanism of controlled mechanical switch self does not also thread off, therefore controlled mechanical switch is also in closure state, meanwhile electric charge absorbing circuit 7 is closed, be equivalent to as shown in Figure 3 open circuit, alternating current 220V is connected to the path of load 8, and load 8 obtains electric normal work.The LED light green indicating lamp that controlled by digital signal processor 3 is lighted, the buzzer 16 information ring signal that do not give a warning, and LCD MODULE 13 shows the information such as power factor (PF)s, electric weight.

Embodiment bis-: as shown in Figure 4, when load 8 short circuit, the signal of accurate low-resistance noninductive resistance inputs to digital signal processor 3 after Amplification and insulation, digital signal processor 3 is when multinomial conditional operation is defined as true property short-circuit signal, send cut-off signal and be series at the high-current power module 4 in load 8 loops to isolation drive module 5 instantaneous trips, the mechanical switch control end output signal of while digital signal processor 3, controlled mechanical switch coil obtains electric, the mechanical contact being series in load 8 loops disconnects, realize the physics disjunction of input and output---other security incident that this measure can effectively avoid high-current power module 4 because of the Leakage Current that performance is bad or temperature influence causes semiconductor high-current power module internal electron hole to be caused increase, rear class to be caused, in this electric charge absorption control output end output of digital signal processor 3 simultaneously, open signal, 7 moments of electric charge absorbing circuit that are connected in parallel on load 8 two ends close, absorption may be from the residual charge in circuit, further reduce the dangerous spark of short circuit place, when digital signal processor 3 is confirmed after true property load short circuits signal, sequential relationship between high-current power module 4, controlled mechanical switch, electric charge absorbing circuit 7 threes is: first high-current power module 4 disconnects with the speed of microsecond, within 2uS, electric charge absorbing circuit 7 is closed, and is then that controlled mechanical switch obtains the controlled mechanical switch of electric rear disconnection at Inside coil, the red led being connected with digital signal processor 3 is lighted simultaneously, and buzzer 16 information rings are warned, and show the details of this short circuit in LCD MODULE 13.

Embodiment bis-: as shown in Figure 4, when load 8 overload, signal without accurate low-resistance noninductive resistance inputs to digital signal processor 3 after Amplification and insulation, digital signal processor 3 is after delay Analysis is determined overload, with the above-mentioned control signal of equally sending, be finally passed to large power, electrically flow module 4, large power, electrically flow module 4 cuts off rapidly the overload current in load 8,7 conductings of electric charge absorbing circuit, controlled mechanical switch disconnects afterwards, the LED indicating module yellow indicator lamp that controlled by digital signal processor 3 is lighted, buzzer 16 information ring warnings.

Embodiment bis-: as shown in Figure 4, when outside creepage mutual inductor input module 12 incoming digital signal processors 3 detect the leakage current that is greater than threshold values, digital signal processor 3 sends control signal and is finally passed to high-current power module 4, high-current power module 4 disconnects, 7 conductings of electric charge absorbing circuit, controlled mechanical switch disconnects afterwards, and the electric leakage indicator light that controlled by digital signal processor 3 is lighted, buzzer 16 information ring warnings.

Embodiment bis-: in sum, as shown in Figure 4, when being short-circuited, transshipping, leaking electricity after abnormal case, the power path of load 8 is cut off and quits work; After short circuit or the eliminating of overload leak current fault, press " reset " switch in the keyboard input module that digital signal processor in figure below 3 connects, the power path of load 8 recloses, and is returned to the state of Fig. 3, load 8 is normally worked, and device reenters normal monitoring pattern.

Embodiment tri-: as shown in Figure 5, in the worst case, when large power, electrically flow module 4 puncture shorts, even if digital signal processor 3 sends cut-off signal, large power, electrically flow module 4 can not disconnect yet, if now digital signal processor 3 is also because certain reason damage, the signal of isolation drive module 5 now, the signal of controlled mechanical switch, electric charge absorbing circuit 7 is equivalent to all lose efficacy, if now there is load 8 short circuits or overload, due to increasing sharply of short circuit current, cause controlled mechanical switch induced inside coil magnetic force to strengthen and adhesive internal mechanical valve, the controlled mechanical switch that causes being connected in load 8 loops is threaded off, load 8 abnormal currents are cut off.This controlled mechanical switch is controlled by two paths of signals, the one, the short circuit that self is subsidiary and overload detection mechanical device, as long as electric current exceeds predetermined threshold values, the automatic disconnecting consumers power supply of controlled mechanical switch, the 2nd, be subject to external control as the control of triode Q1 in figure, as long as triode Q1 conducting, apply a voltage additionally to controlled mechanical switch, the effect reaching is the same with first can disconnect its mechanical contact equally; Add this mechanical switch as a kind of redundancy backup of this device, when device occurs under extreme case, this device is effective open failure electric current also, can not cause causing the possibility of serious security incident because this device internal components loses efficacy, therefore compare the high reliability of this behave energy assurance device with other like product.

Embodiment tetra-: as shown in Figure 6, when connect inductive load 8 terminal shortcircuit, because the described high-current power module of upper joint 4 can disconnect rapidly the power supply in major loop with the speed of microsecond, if the moment that high-current power module 4 disconnects is positive half cycle, according to Faraday's electromagnetic induction law:

e=-L*di/dt

Because the dt time is very little, therefore can produce at inductive load two ends high induced electromotive force contrary to former input polarity, if when electric charge absorbing circuit does not access, this induced electromotive force can be applied directly to short dot by circuit internal resistance and contact resistance, as shown in the current path 222 in figure, now can produce very large dangerous spark at short dot, very easily cause security incident.

Embodiment tetra-: as shown in Figure 6, this device inside adds after electric charge absorbing circuit 7, because electric charge absorbing circuit 7 is very little in the moment internal resistance of opening, the process that is equivalent to a large capacitor charging, therefore the induced electromotive force producing greatly electric charge is released by the current path 111 shown in Fig. 6, in short circuit place, only produce extremely small spark, so this device is not no matter while connecing inductive load or capacitive load, all can produce larger dangerous spark.

More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (5)

1. with the multifunctional fire-proof short-circuit protector of redundant apparatus, it is characterized in that: comprise Switching Power Supply (1), current sampling device (2), digital signal processor (3), high-current power module (4), isolation drive module (5), redundant apparatus (6), electric charge absorbing circuit (7) and load (8), described redundant apparatus (6) is controlled mechanical switch, the L end of alternating current 220V is connected with one end of current sampling device (2) with the input of resistance (R1), described Switching Power Supply (1), the input of differential amplifier (9) respectively, and the N end of described alternating current 220V is connected with load (8) with the input of one end of resistance (R2), described Switching Power Supply (1), one end of electric charge absorbing circuit (7) respectively, the other end of described resistance (R2) is connected with described digital signal processor (3) with one end of resistance (R3) respectively, the equal ground connection of the other end of the other end of described resistance (R3) and resistance (R1), the output of described Switching Power Supply (1) is connected with the input of described differential amplifier (9), and the output of described differential amplifier (9) is connected with described digital signal processor (3) by the first photoelectrical coupler (10), the other end of described current sampling device (2) is connected with one end of described high-current power module (4), described isolation drive module (5) is connected with digital signal processor (3) with one end of described high-current power module (4) respectively, the other end of described high-current power module (4) is connected with load (8) with described electric charge absorbing circuit (7) respectively by described controlled mechanical switch, described electric charge absorbing circuit (7) is connected in parallel on the two ends of described load (8), one end of described controlled mechanical switch coil is connected with described digital signal processor (3) with resistance (R5) by triode (Q1) successively, the other end of described controlled mechanical switch coil is connected with power supply VCC and by the second photoelectrical coupler (11), is connected with described digital signal processor (3) with resistance (R6) successively, described the second photoelectrical coupler (11) is connected with described electric charge absorbing circuit (7).

2. the multifunctional fire-proof short-circuit protector with redundant apparatus according to claim 1, is characterized in that: described digital signal processor (3) is connected with creepage mutual inductor input module (12), LCD MODULE (13), RS485 bus interface (14), keyboard input module (15) and LED indication/buzzer (16) respectively.

3. the multifunctional fire-proof short-circuit protector with redundant apparatus according to claim 1, is characterized in that: described current sampling device (2) is accurate low-resistance noninductive resistance.

4. the multifunctional fire-proof short-circuit protector with redundant apparatus according to claim 1, is characterized in that: described high-current power module (4) adopts high-power MOSFET differential concatenation structure.

5. the multifunctional fire-proof short-circuit protector with redundant apparatus according to claim 1, is characterized in that: described digital signal processor (3) is built-in with electric leakage algoritic module.