CN101030772A - Solid state AC switch - Google Patents

Abstract

An electronic switch for AC currents has only solid state components, including a main bipolar or unipolar switch circuit to switch AC current from an AC line to a load, at least one current limit circuit, a current measurement circuit, a current range setting circuit, a maximum current setting circuit, and a temperature control circuit. All these circuits are controlled by a control logic circuit intended mainly to open and close the switch circuit by means of a manual command and/or according to signals from the circuits.

Description

Solid state AC switch

Technical field

The present invention relates to a kind of alternating current solid-state mains switch that can control the leakage current of the electric current that flows into load and ac line, can manage and shove or overcurrent and detection dead short circuit or abnormal current, can operate by a local hand push button or a remote signal, electromechanical equipment than a reality has less size and weight, can be used for any needs installs in the application of total solidity electronic switch, it is firm that these electronic switches are designed to be, the erection unit that is used for arduous environment reliably, to obtain long life-span, peace and quiet, thereby the operation of safety is controlled completely to equipment.

Background technology

In fact, ac voltage is by electro-mechanical circuit interrupter or electronic equipment control, and the latter is also referred to as solid-state relay, hereinafter referred to as SSR.This electro-mechanical circuit interrupter does not provide the protection to load and this circuit, and does not provide about the state of this ac circuit or flow into the information of the electric current of this load; Have only when these equipment and just can have these performances based on heat and equipment of magnetic principle (but always plant equipment) when using when using or with common fuse with other, in any case the equipment in the main circuit breaker of must being added in this equipment has increased the complexity of size, cost and distribution.

Then; all such electromechanical equipments also have a shortcoming at least, not have lasting operation lifetime, and this is that mechanical structure by the ON/OFF contact causes; regular meeting makes decreased performance, in the time of especially in being installed in an equipment that has noise or a temperature and humidity compression shock.And, owing to more and more appear in the electronics housing of other electronic equipment, also more and more need to be reduced in the electromagnetic noise that produces during the ON/OFF machinery contact.

And; as considering dynamo-electric noise, the use of SSR switch is a danger close, because they have a very high noise factor; and SSR does not assure to loading on the better protection of anti-overcurrent aspect, because they move when open circuit fault or over-current detection slowly.If do not have suitable connection outside or additional electron device, this SSR can't be used for monitoring load efficiency or the mobile electronic installation of electric current.

Summary of the invention

The present invention relates to a kind of solid switchgear,, can solve all problems in the mechanical structure of actual circuit breaker if especially be used for arduous environment.

This switch of the present invention what actual circuit breaker in office is not satisfied the demand or must be united with miscellaneous equipment or electronic device can control load and ac circuit in the electronic equipment of use.

Rely on advanced solid-state power switch technology, these problems can both solve now, and the present invention just relates to a kind of actual solution of this problem, and a kind of alternating current solid-state switch is provided, and this switch can effectively replace actual electromechanical equipment and SSR.

First target of the present invention provides a kind of solid-state switch, without any mechanical part, is applied to alternating voltage, can be easily and the function that replaces electromechanical equipment and SSR to carry out easily.

Another target of the present invention provides a kind of alternating current solid-state switch, can start by manual and/or a remote command, does not need to use such mechanical device of on/off operation.

Another target of the present invention provides a kind of alternating current solid-state switch, can measure the electric current and the line leak electric current that flow into load.

Another target of the present invention provides a kind of alternating current solid-state switch, can manage abnormal current in the uncertain time without a doubt, as overcurrent, spike, shove and dead short circuit or abnormal current or short circuit current.

Another target of the present invention provides a kind of alternating current solid-state switch, and external environmental factor is had hyperimmunization, and self can not produce electromagnetic noise.

Another target of the present invention provides a kind of alternating current solid-state switch, has weight, size and the cost that reduces than traditional electromechanical equipment.

Another target of the present invention provides a kind of alternating current solid-state switch, can indicate its state of user by the mode of lamp.

Another target of the present invention provides a kind of alternating current solid-state switch, can increase the fail safe of erection unit, reduces maintenance and reduces maintenance cost energetically.

Another target of the present invention provides a kind of AC power supplies switch, and it can replace an electro-mechanical circuit interrupter simply.

Another target of the present invention provides a kind of AC power supplies switch, because its coarse reaching with the structure of robust does not adopt screw to carry out being connected of cable, therefore has the particularly high environment body protective degree of anti-vibration of anti-environmental factor.

According to the present invention, these targets only adopt solid-state element manufacturing, alternating current solid-state ac switch by an electronic circuit control to realize by one, and by with the alternating current safe handling required special safe, reliably reach protection scheme and realize.

Description of drawings

Fig. 1 is the block diagram according to a solid-state ac switch of the present invention.

Fig. 1 a is the block diagram according to the solid-state ac switch of preferred second execution mode.

Fig. 2 is the schematic diagram of main switch circuit.

Fig. 3 is the plane graph of seeing from this main switch circuit top.

Fig. 4 is the end view of the main circuit switch of Fig. 3.

Fig. 5 is an illustrative circuitry of measuring ac line leakage current.

Fig. 6 is the schematic diagram in low over-current state protection stage.

Fig. 7 is the schematic diagram in high over-current state protection stage.

Fig. 8 is the short-circuit condition schematic diagram in protection stage.

Fig. 9 is the top view of main switch circuit.

Figure 10 is the schematic diagram of the current source circuit of this switch.

Embodiment

The alternating current solid-state ac switch that describes below can be applied to a lot of aspects effectively.

The block diagram of Fig. 1 shows an application that drives load 8 in the E-communication phase line, wherein all two line L (line) and N (neutral) controlled by a main switch circuit 4, be equivalent to and be embodied as two ac line L and N, but sometimes also can be applicable to a line.

With reference to figure 1, the lead of described ac line L and N and ground wire H are connected to this solid-state ac switch by suitable connecting terminal 1,7, and terminal 1,7th, specialized designs are come anti-vibration and temperature, pressure.

From described ac line, the shielded power supply 13 in inside produces all required voltages of this solid-state ac switch.

This solid-state ac switch itself and load thereof are subjected to the protection of a common due care equipment 2.

L links to each other with N with this AC line, can insert the circuit of a measurement as the leakage current 3 of the difference between current that flows into described circuit.

This main switch circuit 4 is these solid-state ac switch most important parts, and it can realize that this fin is necessary for consume the heat that produces under exceptional condition by using power fet transistor 18 to be fixed on the suitable fin 20.

First execution mode according to Fig. 1, load 8 is subjected to the control of current limiter circuit 5 and current measurement circuit 6, this current measurement circuit 6 is connected to current range initialization circuit 9, and this initialization circuit 9 is used for selecting different current ranges at this same solid-state ac switch.

This switch also comprises a temperature-control circuit 11, is used to protect main switch circuit 4, with flowing when temperature is abnormal when raising interruptive current.

Circuit 3,5,9,10 link to each other with a control logic circuit 12 with 11, be mainly used in according to from user's order and/or from circuit 3,5,9,10 and 11 signal, the transistor 18 by direct driving main switch circuit 4 comes switching load 8.

Suppose that control logic circuit 12 has following function:

The maximum leakage current that allows is controlled,

The control of restriction current signal,

Current range is set control,

Maximum current control,

The control of fin maximum temperature,

Interface signal control,

The ON/OFF of circuit 4.

The all functions of control logic circuit 12 can realize that numerical value wherein such as timing value or current threshold or voltage reference value obtain by electric capacity or precision resistance by analogue device.Same function can also realize that wherein all parameters can be easy to better be implemented and be programmed or be modified as threshold value, timing value and other more complicated functions by using more flexible and programmable control logic unit.But main switch circuit 4 manual operations also can be controlled by electronic signal.

For this reason, this solid-state ac switch is as described in the application, has a manually interface circuit 15 of control, having a button is used for making load effective or invalid, with a RCI circuit 17, be used for by an on/off commands line and the every function of other holding wires this solid-state ac switch of control.

This solid-state ac switch has tally circuit 16, notifies function information about this equipment with a plurality of lamps.Especially, wish that these lamps indicate being connected of this switch and this ac line, ON/OFF or interrupt status (if possible occurring under the protected mode).

Described lamp can illuminatedly be fixing or flicker pattern when detecting abnormality.

This interface circuit 15 and 17 and signal circuit 16 by an electric insulation circuit 14 of making by optical isolator, be connected to the circuit electrical isolation of ac voltage with other.

This solid-state ac switch has a LVPS circuit 13, is used for all internal circuits of dc driven with three independent outputs.In three dc low-voltages, one of them is exclusively used in 12, the second of drive control logic circuits and is used to drive and the relevant circuit of this L ac line, and the 3rd is used to drive and the relevant circuit of N ac line.

For the more deep the present invention that understands, referring now to Fig. 2 relevant, 3,4 with main switch circuit 4.

The most a kind of solid switch element of suitable alternating current is field effect transistor (FET).Two unidirectional low-cost power fets 18 constitute main switch circuit 4, and are fixed on the fin 20.

On every ac circuit L and the N, main switch 4 is made of the power fet or the igbt transistor 18 of two back-to-back connections of series connection.For fear of the protection stage after used up power and the different temperature stride that is less than in the normal running this ac solid-state switch is caused trouble, these transistors 18 have similar structure.For this reason, these transistors 18 are fixed on the fin 20.The main effect of this fin is under the worst short-circuit conditions, collects in whole volume range and spread heat rapid as far as possible and that equably transistor 18 is consumed.This fin is to be made by a firm metal with high thermal conductance, with the heat that produces at its volume inner accumulated transistor 18 rapidly, especially protects them when overcurrent or short circuit current or the generation of high gradient temperature.

The inside of fin 20 is inserted with a temperature sensor 21, as the protection equipment that prevents the working temperature limit circuit.Control logic circuit 12 monitors the temperature of fin 20, opens main switch circuit 4 definitely with the junction temperature of protection internal power FET.

The time constant of this fin depends on settling time, and the speed of control logic circuit 12 of thermal characteristics, the temperature sensor 11 of power fet transistor 18.The selection of two power fet transistors 18 is good voltage retardance abilities of having considered the two poles of the earth that the alternating current that provided is provided in the main switch circuit 4, a power fet provides retardance during the half period of a utmost point, another power fet provides retardance during the half period of another utmost point.Like this retardance ability of this power fet by use one very simple and detect the circuit 5 of current limliting very fast, and be designed to activate load and check fault during step-down relatively once more when voltage then, and be improved by zero cross point place at alternating current.

Current limiter circuit 5 can be easy to and detect very fast overcurrent or the caused abnormal current of the resistive short of short trouble or moment that causes as by dead short circuit.

The combination of the design of the performance of power fet transistor 18 types, the design of current limiter circuit 5 and fin make it possible to realize one have the high safety blocking ability have very much repellence solid-state ac switch.

The peak voltage that the worst dead circuit or the situation of short circuit can appear at the cycle reaches the time marquis of maximum Vpp, and still, even in this case, control logic circuit 12 just can recover through the time of several microseconds.

Always closing of main switch circuit 4 only is activated at the zero point in cycle, and this is to measure contingent subsequently abnormal current for the voltage place at lower about 6-8Vms.This method has reduced the power loss on the fin, also allows the permanent short-circuit condition of irregular time.

Current-limiting circuit 5 is signaled control logic circuit 12 all electric currents above the value of setting in the current maxima circuit 10, this circuit 10 is designed to a current source circuit that has by the value that characteristic determined of power fet transistor 18, and is embodied as a simple shunt resistance.

Especially, when the signal from current-limiting circuit 5 is activated, the first timer that is positioned at logical circuit 12 begins to count down, and still allow flow through transistor 18 of overcurrent or short circuit current to reset up to it, this is the very short time, all be a few microsecond levels under all situations, this time always is shorter than the time that transistor 18 is supported under the dangerous situation of similar short circuit current state.The second timer that is positioned at logical circuit 12 begins counting with first, and in second all time, logical circuit 12 activates main switch 4 and first timer.

When second timer is reset, it sends order to disconnect the ac lines from load 8 clearly to main switch circuit 4.

This control both allowed to insert need higher initial current peak load, allow again with better results management short circuit current to safe bearing load and circuit.

Current measurement circuit 6 is independently circuit, realizes by a comparator and a pulse modulation design.Current value I ms that this current measurement circuit 6 is measured and the accurate reference voltage in the current range circuit 9 compare.

Fig. 5 shows the structural principle of leakage current measurement circuit 3.This circuit utilizes three coils 19,19 ' and 19 " difference between current that detects the conductor of flowing through measures the leakage current of ac line L and N, and three coil combination are installed in one independently in the circuit, and this circuit also can be inserted in this solid-state ac switch.

Especially, if coil 19 " on the induced voltage Udiff that records greater than a maximum Udiff MAX (characteristic that depends on erection unit); the leakage current of one of ac line L or N is just too big, and main switch circuit 4 is just disconnected by an appropriate command from control logic circuit 12.

Utilize RCI circuit 17, this ac solid-state switch can activate by an external signal, and other signal of circuit 17 can be used to understand following function:

Flowing of electric current,

Over-current state,

The leakage current state,

Higher state of temperature,

Malfunction.

The block diagram of Fig. 1 a shows the solid-state switch according to second preferred implementation of the present invention.Be marked by identical reference marker with the first execution mode identical functions frame.

Control logic circuit 12 programmable setting main switches are demarcated current value (Inom), restriction current value (Ilim), the restriction current value is included in described main switch and demarcates between current value and the described lowest high-current value, the very first time is (Tlim1) at interval, second time interval (Tlim2) and the 3rd time interval (Tlim3).

Preferably, this restriction current value is the maximum current that can not have the load of flowing through of destruction.

Limiting the reference level of electric current I lim and demarcation electric current I nom can realize by a nominal voltage distributor easily, or is programmed in the Nonvolatile programmable resistor, to strengthen the performance of whole programmable system.

Current source circuit 40 links to each other with control logic circuit 12 with main switch 4, is used for the maximum current (Imax) that regulation transistor 18 can be supported following of abominable condition of work.

This current source circuit 40 realizes by a pair of bypass resistance (is used for every pair of transistor 18) and little related elements, and it is used to manage strides through the voltage of these bypasses and detect maximum current Imax and load current Iload.

Current source circuit 40 regulation when the electric current of striding when the voltage of bypass reaches 0.6V be Imax.This moment, this current source circuit 40 disconnected main switch 4 with circuit Offcs, and set up signal Imax for control logic circuit 12.

Iload is the current value that flows through load 8, is used by circuital current limiter 5, current source circuit 40 and circuital current measuring circuit 6.

Circuital current measuring circuit 6 produces a pulse-width signal Ipwm to control logic circuit 12 from signal Iload, and this logical circuit 12 calculates the value of Ieff.

When electric current surpassed the safety level that Imax represents, current source circuit 40 was opened transistor 18 immediately and is produced the Imax signal, as shown in Figure 8.

Current limiter circuit 5 is used for avoid the shoving interference of (inrush current) and short circuit of protection equipment.

As everyone knows, when occurring shoving, the response of actual electro-mechanical circuit interrupter depends on the mechanical structure of bimetallic blade.(K Z...) is used to mate specific load and this circuit breaker to the normal response curve of electro-mechanical circuit interrupter for B, C.

According to the present invention, this solid-state switch of mentioning here is designed to software emulation with described curve and acts on and shove.For this reason, some parameters that defined must be programmed in the control logic circuit 12 and be used for management and shove by external module interface 17.

These parameters are divided into low and high overcurrent and short-circuit condition according to load electricity levels of current with all shoving, and by Tlim1 above-mentioned, Tlim2, Tlim3, Inom and Ilim define.

As an embodiment, if the demarcation electric current of switch is 5A (ampere), Ilim can be set at 7A, and Tlim1 can be set at 500ms, and Tlim2 is set at 120ms, and Tlim3 is set at 10ms.

Come back to current limiter circuit 5 now, this circuit is realized by high-speed comparator, in order to the level of Control current Ilim, Inom and Iload.

Particularly, there are two independently comparators the inside of this demand limiter 5: a high overcurrent condition that is used for when Iload＞Ilim, another is used for the low overcurrent condition when Iload＞Inom.

When detecting low overcurrent condition, control logic circuit 12 reads the circuit Ovlow that is set by the circuit of demand limiter 5, and activates first timer Tlim1, shown in figure 06.This switch is under the low over-current state, because surpass the calibration value of electric current.Tlim1 is activated, and this over-current state remains to Tlim1 always to be finished.Afterwards, if Iload＜Inom then switch operate as normal are perhaps opened switch clearly by the on/off commands that control logic unit 12 sends to main switch circuit 4.

When demand limiter 5 detected high overcurrent condition, this limiter was set circuit Offcl, and it makes main switch circuit 4 open transistor 18.Control logic unit 12 reads also the circuit Ovhgh that is set by current limiter circuit 5 then, and in the program of time T lim2 start detection abnormal conditions, activates main switch in each cycle.Afterwards, if Iload＜Inom then switch normally move, if or Iload＜Ilim but Iload＞Inom then switch enters low over-current state, or send to by control logic unit 12 circuit main switch 4 explicit command open switch.

Beginning then starts the short circuit program at time T lim3 just greater than Imax if shove.During the short-circuit condition, by bypass resistance 50 determined electric currents in transistor 18, move and each cycle directly immediately open main switch 4.This process is carried out the Tlim3 time, and starts at the zero cross point of subsequent cycle.

It should be noted that the common load of shoving begins with short-circuit condition, through from high to low over-current state, step into normal operation at last then.

The difference of the management of two kinds of overcurrent conditions is that for high overcurrent, as shown in Figure 7, load 8 is separated immediately to be similar to the process of using under the short circuit condition.

Fig. 6,7 and 8 show the behavior of the AC solid-state switch when detecting abnormal current and flow.Especially, Fig. 6 is a detected low over-current state when Inom＜Iload＜Ilim; High over-current state when Fig. 7 is Ilim＜Iload; Protection when Fig. 8 represents short-circuit condition Iload＞Imax.

It should be noted that for the sake of security the detection of short circuit condition preferentially and is promptly managed by current source circuit 40, and does not rely on the activity of control logic unit 12.

But 4 manual operations of circuit main switch, or can control by a signal of telecommunication.

Especially, with reference to figure 2, main switch 4 circuit are the ON/OFF signals that are used to detect respectively from control logic unit 12, and from the Offcs and the Offcl signal of current source circuit 40 and demand limiter 5.

Signal Temp obtains from temperature sensor 21.

, and and if only if play a role during normal running by the in house software program control from the ON/OFF signal of control logic unit 12.This signal is used for activation main switch 4.

Should be noted that control logic unit 12 has only supervisory role, can not interfere described switching function when abnormal current occurs.Because according to software-firmware program, control logic unit 12 is not used to get involved at a high speed.

The very careful Applied Digital technology of this equipment according to the present invention, but and never be used for the switch life function.These functions are arranged in the direct control of the logical circuit of current source circuit 40 and demand limiter 5.

Determined to manage by this way this switch and be because, especially when beginning, or when short-circuit state occurs, electric current produces the high interference spike, these spikes can start the inner house dog or the function of interruption or reset control logic unit 12, thereby bring inevitable interference immediately (calculating with several delicate levels) to reach the main switch appreciable impact in 4 life-spans.

The manual control interface 15 that has a button in the circuit of this solid-state ac switch in addition is used for activating or the deexcitation load, also has circuit signal lamp 16, is used to notify functional about equipment.

Wish especially these lamps can indicator cock with being connected of ac circuit, ON/OFF and protected mode under the situation of all generations.

The Long-distance Control of this switch realizes by an infrared interface 14 that uses 17 control logic circuits 12 and external module interfaces.This mode has been simplified number of elements, especially is generally used for separating the optical coupler part of high-pressure section and low-pressure section.The use of control logic unit 12 means the management that is forwarded to the mass data of external module interface by infrared interface 14.All parameters are programmed by external module interface 17, and the function of switch can utilize manual control interface 15 and signal lamp 16 to be embodied as independently module by manual control and instruction, and is in one network integrated in the time of maybe near being installed in external module interface 17.

This infrared interface also is selected to avoid the mechanical connection of 17 of the main body of switch and interface modules.This scheme also is achieved on the waterproofing protection level.

Interface module 17 necessary power supplys from the external network bus be connected obtain.

By implementing network-bus protocol, determined a kind of product that can programme and control by software, can be used as a kind of network or product independently.

By using external module interface 17, this device programming parameter is programmed into from external system the memory 60 of control logic circuit 12.

Memory 60 also is used for the operating state of storage switch when interrupting.

For strong realization, all electronic cards of this equipment all concentrate in the resin mass of an epossidic.Can guarantee to resist the more performance of environmental factor like this, and determine to use the production line that designs for the ocean specially.

Application Example

The present invention relates to a kind of alternating current solid-state electronic circuit breaker, have novel notion, as relate to maritime applications.

The maritime affairs erection unit will suffer vibrations, temperature, pressure, humidity, salinity and electromagnetic noise, and submarine cable is always not only complicated but also heavy.

AC switch according to the present invention is a solid-state electronic circuit breaker, be used for this maritime applications, with the problem of avoiding existing on ship today, as space, reliability, weight and size, fail safe, maintainability, reduce the danger of fire, increase the safety on the ship, have the automatic ability of maintenance and equipment self-diagnosis ability.

Some characteristics of this ac solid-state power switch can be able to better explanation by following Application Example.

When external system sends order activation load 8, meanwhile, verify whether this ac circuit electric current does not take place leak, be sent to external module interface 17 by 3 measurements of circuit leakage current and by infrared interface 14.

This characteristic makes at each activation command constantly and the state that can understand this ac circuit in all activated time in load 8, and what the ac circuit in also can notification operator equipment is out of joint, to carry out maintenance fast and safely.

If this switch is installed in the complex apparatus, and is exposed under the rugged environment, and must observe the desired safety regulation of this maritime affairs electronic mounting equipment the time, this ability is extremely important.

Should be noted that if the leakage on this ac circuit also is detected under the situation of external system not having when the operator presses button with activator switch, signal lamp begins flicker, load is disconnected immediately to be connected.

Second embodiment shows the mode that load can be activated.

If load is an incandescent lamp, as known, resistance is similar to a short circuit during its cooling.Current source circuit 40 starts short-circuit protection when detecting electric current I load greater than Imax; Immediately, these current source 40 protective transistors 18, then, in following one-period, control logic unit 12 activates main switch 4, and this process repeats up to having passed through time T lim3, and perhaps the level of Iload is reduced to a safe condition (as shown in Figure 8).

If electric current I load reduces, then high overcurrent protection is activated, and behavior as shown in Figure 7.

If the electric current I load greater than restriction electric current I lim is limited to Ilim, current limiter circuit 5 is protective transistor 18 again.

The high overcurrent protection of Ovhgh on control logic unit 12 detection lines also begins a series of repeatability with time T lim2 and infers.

The function of 12 the supervision switches in control logic unit, and direct Control current and protecting, these functions realize by discrete electronic component.

The value that detects Iload when current limiter circuit 5 is lower than Ilim but is higher than Inom and to load when dangerous, the low overcurrent protection of operation in a similar fashion.

Claims (13)

1, be used for the electronic switch of AC electric current, comprise,

Bipolarity or unipolarity main switch circuit are used to switch this AC electric current from AC circuit to a load;

A current measurement circuit;

A current source circuit, it limits the maximum current (Imax) that main switch can be supported, and described current source is directly connected to described main switch, and is arranged to make described maximum current to produce a voltage that is suitable for causing disconnecting this main switch;

A programmable control logic unit, being used to set a main switch demarcates current value (Inom), is included in restriction current value (Ilim), very first time interval (Tlim1), second time interval (Tlim2) and the 3rd time interval (Tlim3) between described main switch Calibration Circuit value and the described lowest high-current value

Described control logic unit is used for disconnecting and closing described main switch;

A current limiter circuit, be used for relatively this AC electric current and described demarcation electric current and described restriction electric current, described demand limiter is set to be used to send a corresponding command signal, and (Ovlow Ovhgh) gives this control logic unit and directly disconnect this main switch;

Wherein, when occurring shoving,

If described shoving greater than this maximum current, this current source circuit starts a short circuit process, wherein this current source circuit directly disconnects this main switch and activates this control logic unit triggering described the 3rd time interval, and closes described main switch circuit at the zero cross point place in each cycle of this ac electric current and expire up to described the 3rd time interval;

If described shoving is lower than this maximum current but is higher than this restriction electric current, this of current limiter circuit startup exceeds flows through journey, wherein this current limiter circuit directly disconnects this main switch and activates this control logic unit triggering described second time interval, and closes described main switch circuit at the zero cross point in each cycle of this ac electric current and expire up to described second time interval;

If described shoving is lower than this restriction electric current but is higher than this demarcation electric current, this current limiter circuit starts a low overcurrent process, wherein this current limiter circuit activates this control logic unit triggering described very first time at interval, and closes described main switch circuit and expire at interval up to this very first time;

Wherein, in each described process, if described shove before time corresponding is expired at interval, be not reduced to corresponding scope than low value under, then this logic control element finally disconnects this main switch.

2, electronic switch according to claim 1, wherein this control logic unit is programmable, drive this main switch by this way, feasible each waveform that shoves that obtains like this, the response curve of the standard of analog machine electrical circuit breakers for short circuit, high overcurrent and low overcurrent process.

3. electronic switch according to claim 1, wherein this restriction electric current is corresponding to flowing through load but the maximum current of non-breaking load, wherein is allowed to flow through shoving of flowing in the journey and blocked to described restriction current value by described current limiter circuit exceeding.

4. electronic switch according to claim 1, wherein this main switch circuit comprises at least one pair of power fet or the igbt transistor that is used for each AC circuit, described transistor has high thermal conductance or has on the hard metal fin of exhaust outlet being fixed on one, and a temperature sensor is inserted in the fin and with a temperature-control circuit and is connected.

5. electronic switch according to claim 4, wherein current source circuit comprises a pair of bypass resistance, is used for every pair of transistor of described main switch.

6. electronic switch according to claim 1, wherein current limiter circuit comprises at least two independently high-speed comparator circuit, first comparator circuit is used for the comparison load current and demarcates electric current, and second comparator circuit is used for comparison load current and restriction electric current.

7. electronic switch according to claim 1, wherein the reference level of this demarcation electric current and restriction electric current obtains by a voltage divider.

8. electronic switch according to claim 1, wherein the reference level of this demarcation electric current and this restriction electric current is programmed in the Nonvolatile programmable resistance.

9. electronic switch according to claim 1, also comprise, be connected to circuit this AC circuit (L and N), that be used for measuring the leakage current of the difference between currents that flows as described circuit, described circuit comprises independently coil of coil on each AC line conductor and, and wherein the difference between current in induced voltage and L and the N circuit is proportional.

10. electronic switch according to claim 1, comprise that also a manual control interface circuit and a RCI are used for programming and control this control logic unit, described circuit is connected to this control logic circuit, electric insulation circuit of middle insertion.

11. electronic switch according to claim 6, wherein said electric insulation circuit are infrared interfaces.

12. electronic switch according to claim 1; also comprise a tally circuit; be connected with this control logic circuit; described signal circuit has at least two lamps; these lamps are combined in together and glimmer or luminous continuously; provide information, be activated or deexcitation, or protection operation or wrong the generation are not arranged about this ac solid-state switch that is connected to this ac circuit.

13. according to the described electronic switch of the arbitrary claim in front, also comprise a low dc voltage source circuit, has output one or more and this ac line electricity insulation, one of output is used for drive control logic circuit, and other outputs are used to drive remaining circuit relevant with the alternating voltage of circuit L and N.

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