CN105338686A - High-reliability intelligent switch device - Google Patents
High-reliability intelligent switch device Download PDFInfo
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- CN105338686A CN105338686A CN201410390889.9A CN201410390889A CN105338686A CN 105338686 A CN105338686 A CN 105338686A CN 201410390889 A CN201410390889 A CN 201410390889A CN 105338686 A CN105338686 A CN 105338686A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a high-reliability intelligent switch device, which comprises a shell, a capacitive screen, an LED fire line connection terminal, an electric supply fire line connection terminal and an intermediate plate, wherein the capacitive screen is arranged on the shell; a circuit board is arranged between the intermediate plate and a rear cover and comprises a current detection circuit, a thyristor, a control module, a dynamic current maintaining circuit, a zero cross detection circuit and an ambient light brightness induction module; a central processing module for controlling a capacitive touch screen assembly is electrically connected with the control module; the current detection circuit and the thyristor are connected between the LED fire line connection terminal and the electric supply fire line connection terminal in series; a zero line connection terminal and the LED fire line connection terminal are connected with a thyristor starting current circuit and a dynamic current maintaining circuit in parallel; and whether the dynamic current maintaining circuit is enabled or not is dynamically adjusted according to a detection current signal from the current detection circuit. According to the high-reliability intelligent switch device, the condition that current which flows through the control module flows through an LED lamp is avoided; and the phenomenon that the originally controlled LED lamp flickers or cannot be turned off is also avoided.
Description
Technical field
The present invention relates to mains switch technical field, be specifically related to a kind of High reliable intelligent switching device.
Background technology
Existing capacitive touch-sensitive switch, often can only control the Push And Release of LED, only consider illumination, can not be regulated the brightness of LED, can not meet the user demand of more people by switch, such as can not according to season, change to illuminance the brightness that LED is set, on the one hand, LED lamp can not well adapt to traditional controllable silicon dimmer, because LED lamp is built-in with Switching Power Supply and Switching Power Supply drives thus, and Switching Power Supply electric current is operationally usually discontinuous, namely in alternating current one-period, have the electric current non-continuous event of up to a hundred times to thousands of times, even if current continuity, when electric current the lowest point, size of current is often not enough to the maintenance electric current maintaining controllable silicon normally, when LED lamp power is less or especially obvious when high-power LED lamp is turned down by electric current by controllable silicon light modulation, due to flow through silicon controlled electric current be less than make it maintain the electric current of conducting time controllable silicon can surprisingly close, could again be switched on when the next time such as to only have be triggered, even be not enough to make controllable silicon to be triggered conducting when electric current is too small, just there is the phenomenon that LED brightness is abnormal and glimmer, on the other hand, also digital dimming switch is had at present, existing this dimmer switch is by machine controllable silicon, and completely and lamp contact and form current supply circuit, in order to the smooth switch of lamp and light modulation can be made, so single-chip microcomputer must keep normal power supply, and the electric current flowing through control circuit can flow through bulb, the undercurrent of tens milliamperes is lighted to make traditional incandescent lamp, but just may be lit concerning LED, so cause controlled LED lamp originally to occur flicker or cannot close.Therefore, how to design one and can realize LED lamp light modulation, the mains switch glimmered can be avoided again to become the direction of those skilled in the art's effort.
Summary of the invention
The object of the invention is to provide a kind of High reliable intelligent switching device, this High reliable intelligent switching device makes controllable silicon bear too high inverse electromotive force and surprisingly opens situation when solving current switching, and the electric current avoided through control module can flow through LED lamp, solve the phenomenon that controlled LED lamp originally occurs flicker or cannot close.
For achieving the above object, the technical solution used in the present invention is: a kind of High reliable intelligent switching device, comprise housing, the capacitance plate be arranged on housing, zero line binding post, LED hot terminal, civil power hot terminal, intermediate plate and bonnet, between described intermediate plate and bonnet, there is circuit board, described LED hot terminal is for connecting LED lamp, described civil power hot terminal is for connecting civil power live wire
Described circuit board comprises current detection circuit, controllable silicon, control module, zero cross detection circuit, environmental light brightness induction module; One capacitance touching control screen assembly, be electrically connected with control module for the central processing module of control capacitance formula touch screen assembly, described environmental light brightness induction module is connected to central processing module; Described intermediate plate is provided with the on & off switch be connected with control module, positive and negative light modulation key; Described positive and negative light modulation key is for controlling the time delay of trigger impulse electric current thus realizing control to thyristor operating angle, and described on & off switch produces for controlling trigger impulse electric current and closes;
Described zero cross detection circuit input is connected to live wire and the zero line of civil power, and the output of this zero cross detection circuit is connected to control module, for detecting in mains electricity information at zero point, thus generates alternating current zero cross signal;
Current detection circuit, controllable silicon is in series with between described LED hot terminal and civil power hot terminal, current detection circuit is for detecting real-time current size in civil power live wire and generating sensed current signal, and controllable silicon is for controlling the current switching flowing to load;
Described zero line binding post, LED hot terminal are parallel with scr promoter current circuit, dynamic current holding circuit;
Described scr promoter current circuit comprises resistance R20 and the electric capacity C7 of series connection, and electric capacity C7 absorbs the repercussion electromotive force in LED lamp 14 switching process, provides starting current to make controlled silicon conducting under triggering signal drives instantaneously to silicon controlled conducting simultaneously;
Be provided with silicon controlled control circuit between described controllable silicon and control module, this silicon controlled control circuit is used for providing trigger impulse electric current to controllable silicon;
Be provided with optocoupler between described dynamic current holding circuit and control module and transmit control circuit, this optocoupler transmits control circuit and determines whether to need to make dynamic current holding circuit according to starting current size;
Described control module controls silicon controlled control circuit according to alternating current zero cross signal and produces trigger impulse electric current, and according to the whether enables dynamic electric current holding circuit of the sensed current signal dynamic conditioning from current detection circuit;
Light luminance in described environmental light brightness induction module induced environment thus generate containing the brightness signal of environmental light brightness information, brightness signal is transferred to control module by described central processing module, and then the time delay of adjustment trigger impulse electric current thus the control realized thyristor operating angle.
In technique scheme, further improved plan is as follows:
1. in such scheme, described dynamic current holding circuit, for maintaining the starting current of controlled silicon conducting, it comprises reduction voltage circuit, electric bridge J3, Hall current sensing device U12, full-wave rectification amplifying circuit centered by amplifier U11, 1.25V is the source of stable pressure D3 of benchmark, nmos device U7 and electric capacity C8, described for provide the reduction voltage circuit of constant low-voltage to be positioned at source of stable pressure D3 that electric bridge J3 and 1.25V is benchmark, between nmos device U7, nmos device U7 one end is connected to controllable silicon (6) by resistance R36 and electric bridge J3, the nmos device U7 other end is by resistance R23, R26 ground connection, described 1.25V is that the source of stable pressure D3 of benchmark is between the grid and ground connection of nmos device U7, described electric capacity C8 is between the source of stable pressure D3 of benchmark at the gate pole of nmos device U7 and 1.25V, to flow through 1.25V be the electric current of the source of stable pressure D3 of benchmark is I, when I exceedes setting electric current, 1.25V is that the reference input terminal voltage of the source of stable pressure D3 of benchmark increases, 1.25V is caused to be the source of stable pressure D3 negative and positive electrode impedance step-down of benchmark, the gate voltage also corresponding reduction of nmos device U7, I just reduces thus, thus the constant current value in setting.
2. in such scheme; one switching power circuit input is connected to live wire and the zero line of civil power; for mains electricity being converted into DC low-voltage electricity and providing electric energy to control module, active rectification amplifying circuit, silicon controlled control circuit, described switching power circuit output is in series with overvoltage crowbar.
3. in such scheme, also comprise humiture induction module, for temperature, humidity in induced environment, and by the Signal transmissions containing humiture information to central processing module, and shown by capacitance touching control screen assembly.
4. in such scheme, described silicon controlled control circuit comprises triode T3, optocoupler controllable silicon U1, resistance R41, triode T3 and resistance R41 connect and between voltage end and ground connection, described resistance R41 is in parallel with the input of optocoupler controllable silicon U1, the base stage of triode T3 is connected to control module, and 2 outputs of optocoupler controllable silicon U1 are connected respectively to silicon controlled gate pole and input.
5. in such scheme, described current detection circuit adopts Hall current sensing device U3, described active rectification amplifying circuit comprises operational amplifier U4, PMOS device U9, triode T2, described operational amplifier U4 and PMOS device U is arranged in parallel and all between current detection circuit and control module, the collector and emitter of triode T2 is between the grid and ground connection of PMOS device U9, and the base stage of triode T2 is connected to control module, for receive for amplify and normal between the amplification that switches select signal.
6. in such scheme, described optocoupler transmits control circuit and comprises PMOS device U6, optocoupler U10, the source of stable pressure D3 that this PMOS device U6 is benchmark by resistance and 1.25V connects, and the output of this optocoupler U10 is connected to the gate pole of PMOS device U6, and the input of optocoupler U10 is connected to control module.
7. in such scheme, also comprise humiture induction module, for temperature, humidity in induced environment, and by the Signal transmissions containing humiture information to central processing module, and shown by capacitance touching control screen assembly.
8. in such scheme, also comprise camera, WIFI module, microphone and loudspeaker module, described WIFI module, microphone and loudspeaker module are connected to central processing module.
Because technique scheme is used, the present invention compared with prior art has following advantages and effect:
1. High reliable intelligent switching device of the present invention, which solve light high-power LED lamp (as 500W and more than) time, because high-power LED lamp induction reactance is excessive, LED mostly is Switching Power Supply and drives, make controllable silicon bear too high inverse electromotive force and unexpected situation of opening during current switching when power is larger, substantially increase the reliability applied in high-power LED lamp; Secondly, simultaneously compatible low-power LED lamp (as below 8W) and high-power LED lamp (as 500W and more than), and can the intelligent controllable silicon dimmer of measuring electric quantity in real time, solve the phenomenon because the less and electric current of LED lamp power is discontinuous, controllable silicon surprisingly being closed to cause to glimmer, improve the problem that the electrical measurement precision that causes because bearing power differs greatly is on the low side.
2. High reliable intelligent switching device of the present invention, it is separated setting for the power branch controlling also driving LED light fixture with power supply branch road, the power supplies such as control module are ensured simultaneously in LED lamp, the electric current avoided through control module can flow through LED lamp, the undercurrent of tens milliamperes is lighted to make traditional incandescent lamp, but just may be lit concerning LED, solve the phenomenon that controlled LED lamp originally occurs flicker or cannot close; Secondly, be provided with active rectification amplifying circuit between its current detection circuit and control module, improve the problem that the electrical measurement precision that causes because bearing power differs greatly is on the low side.
3. High reliable intelligent switching device of the present invention, avoid the electric current when current impulse is in the lowest point be less than the minimum maintenance electric current of controllable silicon and cause unexpected closedown, occur flicker, when bearing power is less, load current is less than controllable silicon extinction current and controllable silicon also can be caused surprisingly to close; Again, control module according to Real-time Collection to current value show that real-time current is higher than when maintaining electric current needed for controllable silicon, transmit control circuit by optocoupler dynamic current holding circuit cuts out, reach the effect improving system effectiveness, equally, when single-chip microcomputer 11 Real-time Collection to current value be always zero reach certain time length after, transmit control circuit by optocoupler and dynamic current holding circuit cut out, reach and improve the effect of system effectiveness.
4. High reliable intelligent switching device of the present invention, can environmentally in illumination intensity, the automatically brightness of adjustment LED lamp, both improve comfortableness, also saved the energy, realize amusement and leisure by switch panel simultaneously, online, information displaying, greatly facilitates the diversified demand of people.
Accompanying drawing explanation
Fig. 1 is the structural representation of High reliable intelligent switching device of the present invention;
Fig. 2 is the schematic block circuit diagram of High reliable intelligent switching device of the present invention;
Fig. 3 is the electrical block diagram of High reliable intelligent switching device of the present invention;
Fig. 4 is control module schematic diagram in High reliable intelligent switching device of the present invention;
Fig. 5 is High reliable intelligent switching device breaker in middle circuit construction of electric power schematic diagram of the present invention;
Fig. 6 is overvoltage crowbar structural representation in High reliable intelligent switching device of the present invention.
In above accompanying drawing: 1, switching power circuit; 2, overvoltage crowbar; 3, zero cross detection circuit; 4, current detection circuit; 5, active rectification amplifying circuit; 6, controllable silicon; 7, silicon controlled control circuit; 8, scr promoter current circuit; 9, dynamic current holding circuit; 10, optocoupler transmits control circuit; 11, control module; 12, on & off switch; 13, positive and negative light modulation key; 14, LED lamp; 15, capacitance touching control screen assembly; 16, central processing module; 17, humiture induction module; 18, camera; 19, WIFI module; 20, microphone and loudspeaker module; 21, display screen; 22, environmental light brightness induction module; 23, housing; 24, capacitance plate; 25, intermediate plate; 26, bonnet.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment: a kind of High reliable intelligent switching device, comprise housing 23, the capacitance plate 24 be arranged on housing 23, zero line binding post, LED hot terminal, civil power hot terminal, intermediate plate 25 and bonnet 26, between described intermediate plate 25 and bonnet 26, there is circuit board, described LED hot terminal
For connecting LED lamp 14, described civil power hot terminal is for connecting civil power live wire, and described circuit board comprises current detection circuit 4, controllable silicon 6, control module 11, zero cross detection circuit 3, environmental light brightness induction module 22; One capacitance touching control screen assembly 15, be electrically connected with control module 11 for the central processing module 16 of control capacitance formula touch screen assembly 15, described environmental light brightness induction module 22 is connected to central processing module 16; Described intermediate plate 25 is provided with the on & off switch 12 be connected with control module 11, positive and negative light modulation key 13; Described positive and negative light modulation key 13 is for controlling the time delay of trigger impulse electric current thus realizing control to controllable silicon 6 angle of flow, and described on & off switch 12 produces for controlling trigger impulse electric current and closes;
Described zero cross detection circuit 3 input is connected to live wire and the zero line of civil power, and the output of this zero cross detection circuit is connected to control module 11, for detecting in mains electricity information at zero point, thus generates alternating current zero cross signal;
Current detection circuit 4, controllable silicon 6 is in series with between described LED hot terminal and civil power hot terminal, current detection circuit 4 is for detecting real-time current size in civil power live wire and generating sensed current signal, and controllable silicon 6 is for controlling the current switching flowing to load;
Described zero line binding post, LED hot terminal are parallel with scr promoter current circuit 8, dynamic current holding circuit 9;
Described scr promoter current circuit 8 comprises resistance R20 and the electric capacity C7 of series connection, and electric capacity C7 absorbs the repercussion electromotive force in LED lamp 14 switching process, provides starting current to make controllable silicon 6 conducting under triggering signal drives instantaneously to the conducting of controllable silicon 6 simultaneously;
Described dynamic current holding circuit 9, for maintaining the starting current of controllable silicon 6 conducting, it comprises reduction voltage circuit, electric bridge J3, Hall current sensing device U12, full-wave rectification amplifying circuit centered by amplifier U11, 1.25V is the source of stable pressure D3 of benchmark, nmos device U7 and electric capacity C8, described for provide the reduction voltage circuit of constant low-voltage to be positioned at source of stable pressure D3 that electric bridge J3 and 1.25V is benchmark, between nmos device U7, nmos device U7 one end is connected to controllable silicon (6) by resistance R36 and electric bridge J3, the nmos device U7 other end is by resistance R23, R26 ground connection, described 1.25V is that the source of stable pressure D3 of benchmark is between the grid and ground connection of nmos device U7, described electric capacity C8 is between the source of stable pressure D3 of benchmark at the gate pole of nmos device U7 and 1.25V, the switching time delaying nmos device U7 effect avoid current spike, described full-wave rectification amplifying circuit is between the source of stable pressure D3 of benchmark at Hall current sensing device U12 and 1.25V, the electric current flowing through load also flows through Hall current sensing device U12 simultaneously, the current signal sensed is changed into voltage signal and is amplified by the full-wave rectification amplifying circuit centered by amplifier U11 and output to the reference input pin of the source of stable pressure D3 that 1.25V is benchmark after rectification by U12, suppose that the voltage transformed all is U, then flow through the electric current of nmos device U7 by formula:
Draw, so the electric current flowing through nmos device U7 is set by U, when I exceedes setting electric current, 1.25V is that the reference input terminal voltage of the source of stable pressure D3 of benchmark increases, 1.25V is caused to be the source of stable pressure D3 negative and positive electrode impedance step-down of benchmark, the gate voltage also corresponding reduction of nmos device U7, I just reduces thus, thus the constant current value in setting;
Be provided with silicon controlled control circuit 7 between described controllable silicon 6 and control module 11, this silicon controlled control circuit 7 provides trigger impulse electric current for giving controllable silicon 6;
Be provided with optocoupler between described dynamic current holding circuit 9 and control module 11 and transmit control circuit 10, this optocoupler transmits control circuit 10 and determines whether to need enables dynamic electric current holding circuit 9 according to starting current size;
Described control module 11 controls silicon controlled control circuit 7 according to alternating current zero cross signal and produces trigger impulse electric current, and according to the whether enables dynamic electric current holding circuit 9 of the sensed current signal dynamic conditioning from current detection circuit 4, described positive light modulation key 13 and negative light modulation key 14 are for controlling the time delay of trigger impulse electric current thus the control realized controllable silicon 6 angle of flow, and described on & off switch 12 produces for controlling trigger impulse electric current and closes;
Light luminance in described environmental light brightness induction module 22 induced environment thus generate containing the brightness signal of environmental light brightness information, brightness signal is transferred to control module 11 by described central processing module 16, and then the time delay of adjustment trigger impulse electric current thus the control realized controllable silicon 6 angle of flow, realize the brightness of adjustment LED lamp automatically, both improve comfortableness, also save the energy.
One switching power circuit 1 input is connected to live wire and the zero line of civil power; for mains electricity being converted into DC low-voltage electricity and providing electric energy to control module 11, active rectification amplifying circuit 5, silicon controlled control circuit 7, described switching power circuit 1 output is in series with overvoltage crowbar 2.
Also comprise humiture induction module 17, for temperature, humidity in induced environment, and by the Signal transmissions containing humiture information to central processing module 16, and shown by capacitance touching control screen assembly 15.
Active rectification amplifying circuit 5 is provided with between described current detection circuit 4 and control module 11, the sensed current signal received from current detection circuit 4 when control module 11 is less than set point, makes active rectification amplifying circuit 5 carry out amplifying the sensed current signal after generating amplification by detecting size of current.
Described silicon controlled control circuit 7 comprises triode T3, optocoupler controllable silicon U1, resistance R41, triode T3 and resistance R41 connect and between voltage end and ground connection, described resistance R41 is in parallel with the input of optocoupler controllable silicon U1, the base stage of triode T3 is connected to control module 11, and 2 outputs of optocoupler controllable silicon U1 are connected respectively to gate pole and the input of controllable silicon 6.
Described current detection circuit 4 adopts Hall current sensing device U3, described active rectification amplifying circuit 5 comprises operational amplifier U4, PMOS device U9, triode T2, described operational amplifier U4 and PMOS device U is arranged in parallel and all between current detection circuit 4 and control module 11, the collector and emitter of triode T2 is between the grid and ground connection of PMOS device U9, and the base stage of triode T2 is connected to control module 11, for receive for amplify and normal between the amplification that switches select signal.
Described optocoupler transmits control circuit 10 and comprises PMOS device U6, optocoupler U10, the source of stable pressure D3 that this PMOS device U6 is benchmark by resistance and 1.25V connects, the output of this optocoupler U10 is connected to the gate pole of PMOS device U6, and the input of optocoupler U10 is connected to control module 11.
Also comprise camera 18, WIFI module 19, microphone and loudspeaker module 20, described WIFI module 19, microphone and loudspeaker module 20 are connected to central processing module 16, realize amusement and leisure, information displaying by switch panel.
The present embodiment High reliable intelligent switching device course of work is as follows: as shown in Figure 2; the switching device of the present embodiment comprises switching power circuit 1, overvoltage crowbar 2, zero cross detection circuit 3, current detection circuit 4, active rectification amplifying circuit 5, controllable silicon 6, silicon controlled control circuit 7, scr promoter current circuit 8, dynamic current holding circuit 9, optocoupler transmit control circuit 10, control module 11 adopts single-chip microcomputer, button 12 and connector 13, and concrete circuit diagram please refer to Fig. 2,3,4,5.
The input of switching power circuit 1 described in Fig. 5, Fig. 6 connects city's voltage; the input of overvoltage crowbar 2 described in output connection layout 3; the mains signal of input first carries out reduced output voltage 5V constant voltage source after filtering and rectification by described switching power circuit 1, after further step-down for single-chip microcomputer 11, silicon controlled control circuit 7, active rectification amplifying circuit 5, optocoupler transmits control circuit 10 provides power supply.
The input of zero cross detection circuit 3 described in Fig. 3 connects city's voltage, U2 inside is made up of just antiparallel two infrarede emitting diodes, because alternating current positive half period and negative half-cycle all can make one of them infrarede emitting diode luminous, and pass through R5, the current limliting of R6 makes the inner triode ON ground connection of U2, T1 goes out to obtain high level, when each periodic alternating current crimps nearly 0V, light-emitting diode due to pressure drop deficiency cause end conducting, just there is low level in T1 place, when being greater than N Deng alternating voltage, T1 goes out by again recovering high level, go round and begin again the alternating current zero cross signal just obtained in each cycle.
This signal is connected to the interrupting input pin of Fig. 5 single-chip microcomputer 11, according to the setting of program, single-chip microcomputer 11 after obtaining zero cross signal through certain time delay, the input infrarede emitting diode conducting that high level makes optocoupler controllable silicon U1 is exported by the pin being connected to silicon controlled control circuit 7 described in Fig. 4, the output of U1 is high withstand voltage controllable silicon, controllable silicon 6 shown in Fig. 4 can be made after conducting to obtain reliable triggering signal, here the effect of optocoupler controllable silicon U1 is isolation, due to single-chip microcomputer 11 reference be not equal to controllable silicon 6 reference ground, so single-chip microcomputer 11 cannot Direct driver controllable silicon 6.
In Fig. 3, the L of civil power is through overcurrent sensing circuit 4, controllable silicon 6, draw L ', load 14 is connected between L ' and N, and this constitutes a basic path, and when controlled silicon conducting, load 14 obtains electric current and is lit, but when if load 14 is LED lamp, because LED lamp mostly is Switching Power Supply, it is inductive load, makes controllable silicon bear too high inverse electromotive force and surprisingly to open during current switching when power is larger.Another problem of elementary path is that electric current and input voltage exist certain phase shift when bearing power factor is poor, even if controllable silicon obtains reliable triggering signal, the pressure reduction at two ends is also enough, but because trigger current causes controllable silicon normal reliable to open not, there is flicker, for this two problems scr promoter current circuit 8 described in load place Fig. 4 in parallel in the present invention, R20 and C7 constitutes a buffer, absorb the repercussion electromotive force in inductive load 14 switching process, simultaneously also for the conducting of controllable silicon 6 provides starting current instantaneously, make controllable silicon 6 conducting smoothly, due to the electric capacity that C7 is nanofarad range, so the impact of power factor (PF) can not be brought on the load of high power factor,
Electric current when the another kind of situation that tradition controllable silicon dimmer can be encountered is Switching Power Supply work in LED lamp is non-linear discrete pulse, when current impulse is in the lowest point, electric current is less than the minimum maintenance electric current of controllable silicon and causes unexpected closedown, there is flicker, when bearing power is less, load current is less than controllable silicon extinction current and controllable silicon also can be caused surprisingly to close, the present invention is directed to the dynamic current holding circuit 9 of this problem shown in the Fig. 3 in parallel of load 14 two ends, it comprises reduction voltage circuit, electric bridge J3, Hall current sensing device U12, full-wave rectification amplifying circuit centered by amplifier U11, 1.25V is the source of stable pressure D3 of benchmark, nmos device U7 and electric capacity C8, described for provide the reduction voltage circuit of constant low-voltage to be positioned at source of stable pressure D3 that electric bridge J3 and 1.25V is benchmark, between nmos device U7, nmos device U7 one end is connected to controllable silicon (6) by resistance R36 and electric bridge J3, the nmos device U7 other end is by resistance R23, R26 ground connection, described 1.25V is that the source of stable pressure D3 of benchmark is between the grid and ground connection of nmos device U7, described electric capacity C8 is between the source of stable pressure D3 of benchmark at the gate pole of nmos device U7 and 1.25V, the switching time delaying nmos device U7 effect avoid current spike, described full-wave rectification amplifying circuit is between the source of stable pressure D3 of benchmark at Hall current sensing device U12 and 1.25V, the electric current flowing through load also flows through Hall current sensing device U12 simultaneously, the current signal sensed is changed into voltage signal and is amplified by the full-wave rectification amplifying circuit centered by amplifier U11 and output to the reference input pin of the source of stable pressure D3 that 1.25V is benchmark after rectification by U12, suppose that the voltage transformed all is U, then flow through the electric current of nmos device U7 by formula:
Draw, so the electric current flowing through nmos device U7 is set by U, when I exceedes setting electric current, 1.25V is that the reference input terminal voltage of the source of stable pressure D3 of benchmark increases, 1.25V is caused to be the source of stable pressure D3 negative and positive electrode impedance step-down of benchmark, the gate voltage also corresponding reduction of nmos device U7, I just reduces thus, thus the constant current value in setting, D4 can protect D3 make its by electric current surprisingly do not raise cause damage, P channel mosfet U6 and optocoupler U10 constitutes optocoupler and transmits control circuit 10, due to controllable current holding circuit 9 load 14 have enough operating currents or without during operating current without the need to work, so this circuit can make controllable silicon obtain enough maintenance electric currents when needs, also reduce the loss of self simultaneously.
Next the current measurement circuit 4 described in Fig. 3 is seen, here U3 is the Hall current sensing device of isolation, its input is connected on controllable silicon 6, through hall sensing and inner amplification, the analog-to-digital conversion input pin that the pulsating direct current that output 2/3.3V is biased is connected to single-chip microcomputer 11 calculates, change than being 264mV/A, floating of exporting when bearing power is less is very little, sampling error can be caused larger, if add amplifying circuit before being connected to single-chip microcomputer 11, then can cause exporting outrange when connect load is 500W, the present invention is directed to this problem and devise the amplifying circuit of active rectification shown in Fig. 25, the amplifying circuit that this circuit is made up of a dual operational amplifier, P channel mosfet U9 and N-P-N triode T2 forms, T2 is connected to the common output pin of single-chip microcomputer 11, U9 and T2 forms a channel selector, acquiescence U9 opens, the signal that U3 gathers is delivered to single-chip microcomputer 11 and samples after U4 amplifies, when single-chip microcomputer 11 sample the current value that obtains be greater than set point certain hour time, exporting high level makes U9 close, the current signal that U3 gathers then is transported to single-chip microcomputer 11 without amplification by U9, thus make signal amplification circuit 5 can improve sampling precision along with load active accommodation multiplication factor.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (9)
1. a High reliable intelligent switching device, comprise housing (23), the capacitance plate (24) be arranged on housing (23), zero line binding post, LED hot terminal, civil power hot terminal, intermediate plate (25) and bonnet (26), between described intermediate plate (25) and bonnet (26), there is circuit board, described LED hot terminal is for connecting LED lamp (14), described civil power hot terminal, for connecting civil power live wire, is characterized in that: described circuit board comprises current detection circuit (4), controllable silicon (6), control module
(11), zero cross detection circuit (3), environmental light brightness induction module (22); One capacitance touching control screen assembly (15), be electrically connected with control module (11) for the central processing module (16) of control capacitance formula touch screen assembly (15), described environmental light brightness induction module (22) is connected to central processing module (16); Described intermediate plate (25) is provided with the on & off switch (12), the positive and negative light modulation key (13) that are connected with control module (11); Described positive and negative light modulation key (13) is for controlling the time delay of trigger impulse electric current thus realizing control to controllable silicon (6) angle of flow, and described on & off switch (12) produces for controlling trigger impulse electric current and closes;
Described zero cross detection circuit (3) input is connected to live wire and the zero line of civil power, and the output of this zero cross detection circuit is connected to control module (11), for detecting in mains electricity information at zero point, thus generates alternating current zero cross signal;
Current detection circuit (4), controllable silicon (6) is in series with between described LED hot terminal and civil power hot terminal, current detection circuit (4) is for detecting real-time current size in civil power live wire and generating sensed current signal, and controllable silicon (6) is for controlling the current switching flowing to load;
Described zero line binding post, LED hot terminal are parallel with scr promoter current circuit (8), dynamic current holding circuit (9);
Described scr promoter current circuit (8) comprises resistance R20 and the electric capacity C7 of series connection, electric capacity C7 absorbs the repercussion electromotive force in LED lamp 14 switching process, provides starting current to make controllable silicon (6) conducting under triggering signal drives instantaneously to the conducting of controllable silicon (6) simultaneously;
Be provided with silicon controlled control circuit (7) between described controllable silicon (6) and control module (11), this silicon controlled control circuit (7) provides trigger impulse electric current for giving controllable silicon (6);
Be provided with optocoupler between described dynamic current holding circuit (9) and control module (11) and transmit control circuit (10), this optocoupler transmits control circuit (10) and determines whether to need to make dynamic current holding circuit (9) according to starting current size;
Described control module (11) controls silicon controlled control circuit (7) according to alternating current zero cross signal and produces trigger impulse electric current, and according to the whether enables dynamic electric current holding circuit (9) of the sensed current signal dynamic conditioning from current detection circuit (4);
Light luminance in described environmental light brightness induction module (22) induced environment thus generate containing the brightness signal of environmental light brightness information, brightness signal is transferred to control module (11) by described central processing module (16), and then the time delay of adjustment trigger impulse electric current thus the control realized controllable silicon (6) angle of flow.
2. High reliable intelligent switching device according to claim 1, it is characterized in that: described dynamic current holding circuit (9), for maintaining the starting current of controllable silicon (6) conducting, it comprises reduction voltage circuit, electric bridge J3, Hall current sensing device U12, full-wave rectification amplifying circuit centered by amplifier U11, 1.25V is the source of stable pressure D3 of benchmark, nmos device U7 and electric capacity C8, described for provide the reduction voltage circuit of constant low-voltage to be positioned at source of stable pressure D3 that electric bridge J3 and 1.25V is benchmark, between nmos device U7, nmos device U7 one end is connected to controllable silicon (6) by resistance R36 and electric bridge J3, the nmos device U7 other end passes through grounding through resistance, described 1.25V is that the source of stable pressure D3 of benchmark is between the grid and ground connection of nmos device U7, described electric capacity C8 is between the source of stable pressure D3 of benchmark at the gate pole of nmos device U7 and 1.25V, to flow through 1.25V be the electric current of the source of stable pressure D3 of benchmark is I, when I exceedes setting electric current, 1.25V is that the reference input terminal voltage of the source of stable pressure D3 of benchmark increases, 1.25V is caused to be the source of stable pressure D3 negative and positive electrode impedance step-down of benchmark, the gate voltage also corresponding reduction of nmos device U7, I just reduces thus, thus the constant current value in setting.
3. High reliable intelligent switching device according to claim 1; it is characterized in that: a switching power circuit (1) input is connected to live wire and the zero line of civil power; for mains electricity being converted into DC low-voltage electricity and providing electric energy to control module (11), active rectification amplifying circuit (5), silicon controlled control circuit (7), described switching power circuit (1) output is in series with overvoltage crowbar (2).
4. High reliable intelligent switching device according to claim 1, it is characterized in that: also comprise humiture induction module (17), for temperature, humidity in induced environment, and by the Signal transmissions containing humiture information to central processing module (16), and by capacitance touching control screen assembly (15) display.
5. High reliable intelligent switching device according to claim 1, it is characterized in that: between described current detection circuit (4) and control module (11), be provided with active rectification amplifying circuit (5), the sensed current signal received from current detection circuit (4) when control module (11) is less than set point, makes active rectification amplifying circuit (5) carry out amplifying the sensed current signal after generating amplification by detecting size of current.
6. the High reliable intelligent switching device according to any one of claim 1 ~ 4, it is characterized in that: described silicon controlled control circuit (7) comprises triode T3, optocoupler controllable silicon U1, resistance R41, triode T3 and resistance R41 connect and between voltage end and ground connection, described resistance R41 is in parallel with the input of optocoupler controllable silicon U1, the base stage of triode T3 is connected to control module (11), and 2 outputs of optocoupler controllable silicon U1 are connected respectively to gate pole and the input of controllable silicon (6).
7. the High reliable intelligent switching device according to any one of claim 1 ~ 4, it is characterized in that: described current detection circuit (4) adopts Hall current sensing device U3, described active rectification amplifying circuit (5) comprises operational amplifier U4, PMOS device U9, triode T2, described operational amplifier U4 and PMOS device U is arranged in parallel and is all positioned between current detection circuit (4) and control module (11), the collector and emitter of triode T2 is between the grid and ground connection of PMOS device U9, and the base stage of triode T2 is connected to control module (11), for receive for amplify and normal between the amplification that switches select signal.
8. the High reliable intelligent switching device according to any one of claim 1 ~ 4, it is characterized in that: described optocoupler transmits control circuit (10) and comprises PMOS device U6, optocoupler U10, the source of stable pressure D3 that this PMOS device U6 is benchmark by resistance and 1.25V connects, the output of this optocoupler U10 is connected to the gate pole of PMOS device U6, and the input of optocoupler U10 is connected to control module (11).
9. the High reliable intelligent switching device according to any one of claim 1 ~ 4, is characterized in that:
Also comprise camera (18), WIFI module (19), microphone and loudspeaker module (20), described WIFI module (19), microphone and loudspeaker module (20) are connected to central processing module (16).
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| CN105338686B (en) | 2018-09-14 |
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