CN105338684B - Multifunctional capacitor formula contact-making switch - Google Patents
Multifunctional capacitor formula contact-making switch Download PDFInfo
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- CN105338684B CN105338684B CN201410390841.8A CN201410390841A CN105338684B CN 105338684 B CN105338684 B CN 105338684B CN 201410390841 A CN201410390841 A CN 201410390841A CN 105338684 B CN105338684 B CN 105338684B
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Abstract
The present invention discloses a kind of Multifunctional capacitor formula contact-making switch, capacitance plate including housing, on housing, the circuit board include current detection circuit, silicon-controlled, control module, zero cross detection circuit, the on ＆ off switch being connected with control module, positive and negative light modulation key；The zero curve wire connection terminal, LED hot terminal are parallel with scr promoter current circuit, dynamic current holding circuit；It is described it is silicon-controlled silicon controlled control circuit is provided between control module, this silicon controlled control circuit be used for it is silicon-controlled offer trigger pulse electric current；Optocoupler is provided between the dynamic current holding circuit and control module and transfers control circuit.LED lamp power of the present invention is smaller and electric current discontinuously make it is silicon-controlled accidental switch off the phenomenon that causing flicker, and avoid the electric current through control module and can flow through LED lamp, solve the phenomenon that controlled LED lamp occurs flickering or can not close originally.
Description
Technical field
The present invention relates to power switch technical fields, and in particular to a kind of Multifunctional capacitor formula contact-making switch.
Background technology
Existing capacitive touch-sensitive switch can only often control the Push And Release of LED light, take into consideration only illumination, can not lead to
Switch is crossed to adjust the brightness of LED light, it is impossible to meet the use demand of more people；It such as cannot be according to season, become to illuminance
Change the brightness that going, LED light is set；On the one hand, LED lamp cannot well adapt to traditional controllable silicon dimmer, because LED light
Tool is built-in with Switching Power Supply and thus Switching Power Supply drives, and the electric current of Switching Power Supply at work is usually discontinuous, that is, is handing over
The electric current non-continuous event of up to a hundred times to thousands of times is had in galvanic electricity a cycle, it is electric at electric current the lowest point even if electric current is continuous
Stream size is often not enough to maintain the maintenance electric current of silicon-controlled normally, when LED lamp power is smaller or great power LED
Be especially apparent when lamps and lanterns are turned down electric current by controllable silicon light modulation, due to flow through silicon-controlled electric current be less than make its maintain conducting
It is silicon-controlled during electric current to accidental switch off, it could only be switched on when being triggered next times, be even less than when electric current is too small again
So that the silicon-controlled conducting that is triggered, there have been the phenomenon that LED light brightness exception and flicker；On the other hand, also there is number at present
Dimmer switch, existing this dimmer switch even form current supply circuit with lamp string completely by machine controllable silicon, in order to
Lamp can be made smoothly to switch and dim, so microcontroller must keep normal power supply, and the electric current for flowing through control circuit can flowing through lamps
Bubble, tens milliamperes of electric current is insufficient to allow traditional incandescent lamp to light, but may be lit for LED light, so causing
Originally controlled LED lamp occurs flickering or can not close.Therefore, how designing one kind can realize that LED lamp dims,
Being avoided that the power switch of flicker again becomes the direction that those skilled in the art make great efforts.
The content of the invention
It is an object of the present invention to provide a kind of Multifunctional capacitor formula contact-making switch, this Multifunctional capacitor formula contact-making switch solves
Make the silicon-controlled situation born excessively high inverse electromotive force and surprisingly opened during current switching, and avoid the electricity through control module
Stream can flow through LED lamp, solve the phenomenon that controlled LED lamp occurs flickering or can not close originally.
In order to achieve the above objectives, the technical solution adopted by the present invention is：A kind of Multifunctional capacitor formula contact-making switch, including shell
Body, the capacitance plate on housing, zero curve wire connection terminal, LED hot terminals, alternating current hot terminal, intermediate plate
And rear cover, there is circuit board, LED hot terminals is described for connecting LED lamp between the intermediate plate and rear cover
For alternating current hot terminal for connecting alternating current firewire, the circuit board includes current detection circuit, silicon-controlled, dynamic current dimension
Hold circuit, control module, zero cross detection circuit, the on ＆ off switch being connected with control module, positive and negative light modulation key；
The zero cross detection circuit input terminal is connected to the firewire and zero curve of alternating current, and the output terminal of this zero cross detection circuit connects
Control module is connected to, for detecting zero point information in mains AC, so as to generate alternating current zero cross signal；
Current detection circuit, silicon-controlled, electricity are in series between LED hot terminals and alternating current hot terminal
Current detection circuit is silicon-controlled to be flowed into for controlling for detecting real-time current size in alternating current firewire and generating sensed current signal
The current switching of load；
The zero curve wire connection terminal, LED hot terminal are parallel with scr promoter current circuit, dynamic current maintains
Circuit；
The scr promoter current circuit includes the resistance R20 of series connection and capacitance C7, capacitance C7 absorb LED lamp 14 and open
Inverse electromotive force during pass, at the same provide that starting current causes to silicon-controlled conducting moment can in the case where trigger signal drives
Control silicon conducting, the dynamic current holding circuit, for maintaining the starting current of controlled silicon conducting；
It is described it is silicon-controlled silicon controlled control circuit is provided between control module, this silicon controlled control circuit is used for can
It controls silicon and trigger pulse electric current is provided；
Optocoupler is provided between the dynamic current holding circuit and control module and transfers control circuit, this optocoupler transfers control
Circuit processed is determined the need for according to starting current size so that dynamic current holding circuit；
The control module controls silicon controlled control circuit to generate trigger pulse electric current according to alternating current zero cross signal, and
According to the whether enabled dynamic current holding circuit of sensed current signal dynamic adjustment from current detection circuit, the positive and negative tune
For controlling the delay of trigger pulse electric current, so as to fulfill the control to thyristor operating angle, the on ＆ off switch is used to control light key
Trigger pulse electric current is generated and closed.
Further improved scheme is as follows in above-mentioned technical proposal：
1. in said program, a switching power circuit input terminal is connected to the firewire and zero curve of alternating current, for alternating current to be handed over
Galvanic electricity is converted into DC low-voltage electricity and provides electric energy to control module, active rectification amplifying circuit, silicon controlled control circuit, described
Switching power circuit output terminal is in series with overvoltage crowbar.
2. in said program, active rectification amplifying circuit is provided between the current detection circuit and control module, when
Control module receives the sensed current signal from current detection circuit and is less than setting value so that active rectification amplifying circuit will be examined
It surveys size of current and is amplified the amplified sensed current signal of generation.
3. in said program, the silicon controlled control circuit includes triode T3, the silicon-controlled U1 of optocoupler, resistance R41, three poles
Pipe T3 and resistance R41 connects and is located between voltage end and ground connection, and the input terminal of the resistance R41 and silicon-controlled U1 of optocoupler is simultaneously
Connection, the base stage of triode T3 are connected to control module, and 2 output terminals of the silicon-controlled U1 of optocoupler are connected respectively to silicon-controlled gate pole
And input terminal.
4. in said program, the current detection circuit is using Hall current sensing device U3, the active rectification amplification
Circuit includes operational amplifier U4, PMOS device U9, triode T2, and the operational amplifier U4 and PMOS device U9 are arranged in series
And be respectively positioned between current detection circuit and control module, the collector and emitter of triode T2 is located at the grid of PMOS device U9
Between pole and ground connection, and the base stage of triode T2 is connected to control module, for receive for amplification and it is normal between switch
Amplification selection signal.
5. in said program, the optocoupler, which transfers control circuit, includes PMOS device U6, optocoupler U10, this PMOS device U6
It is connected by resistance with the source of stable pressure D3 on the basis of 1.25V, the output terminal of this optocoupler U10 is connected to the gate pole of PMOS device U6,
The input terminal of optocoupler U10 is connected to control module.
Since above-mentioned technical proposal is used, the present invention has following advantages and effect compared with prior art：
1. Multifunctional capacitor formula contact-making switch of the present invention, which solve and light high-power LED lamp (such as 500W and more than)
When, since high-power LED lamp induction reactance is excessive, LED light is mostly Switching Power Supply driving, and when current switching when power is larger makes
The silicon-controlled situation born excessively high inverse electromotive force and surprisingly opened, substantially increases what is applied in high-power LED lamp
Reliability；Secondly, while compatible low-power LED lamp (such as 8W and following) and high-power LED lamp (such as 500W and more than), and
Can measuring electric quantity in real time intelligent controllable silicon dimmer, solve due to LED lamp power is smaller and electric current discontinuously make it is silicon-controlled
The phenomenon that causing flicker is accidental switched off, improves that electrical measurement precision caused by differing greatly due to bearing power is relatively low to ask
Topic.
2. Multifunctional capacitor formula contact-making switch of the present invention is used to control and drives power branch and the power supply of LED lamp
Power branch is separately positioned, ensures the power supplies such as control module simultaneously in LED lamp, avoiding the electric current through control module can flow through
LED lamp, tens milliamperes of electric current is insufficient to allow traditional incandescent lamp to light, but may be lit for LED light, solves
Originally the phenomenon that controlled LED lamp occurs flickering or can not close；Secondly, current detection circuit and control module
Between be provided with active rectification amplifying circuit, it is relatively low to improve electrical measurement precision caused by differing greatly due to bearing power
The problem of.
3. Multifunctional capacitor formula contact-making switch of the present invention, avoid the electric current when current impulse is in the lowest point be less than it is silicon-controlled
Minimum maintenance electric current and cause to accidental switch off, flicker, when bearing power is smaller, load current is less than silicon-controlled minimum
Electric current is maintained to also result in silicon-controlled accidental switch off；Again, silicon-controlled offer can not only be given most by dynamic current holding circuit
Small maintenance electric current, this circuit can reduce itself current drain automatically when flowing through silicon-controlled electric current and gradually increase, and reach raising
The effect of system effectiveness, equally, when the current value that microcontroller 11 collects in real time be always zero reach certain time length after, pass through light
Coupling transfers control circuit and closes dynamic current holding circuit, achievees the effect that improve system effectiveness.
Description of the drawings
Fig. 1 is the structure diagram of Multifunctional capacitor formula contact-making switch of the present invention；
Fig. 2 is the schematic block circuit diagram of Multifunctional capacitor formula contact-making switch of the present invention；
Fig. 3 is the electrical block diagram of Multifunctional capacitor formula contact-making switch of the present invention；
Fig. 4 is control module schematic diagram in Multifunctional capacitor formula contact-making switch of the present invention；
Fig. 5 is switching power circuit structure diagram in Multifunctional capacitor formula contact-making switch of the present invention；
Fig. 6 is overvoltage crowbar structure diagram in Multifunctional capacitor formula contact-making switch of the present invention.
In the figures above：1st, switching power circuit；2nd, overvoltage crowbar；3rd, zero cross detection circuit；4th, current detecting electricity
Road；5th, active rectification amplifying circuit；6th, it is silicon-controlled；7th, silicon controlled control circuit；8th, scr promoter current circuit；9th, dynamic electric
Flow holding circuit；10th, optocoupler transfers control circuit；11st, control module；12nd, on ＆ off switch；13rd, positive and negative light modulation key；14th, LED light
Tool；15th, housing；16th, capacitance plate；17th, intermediate plate；18th, rear cover.
Specific embodiment
With reference to embodiment, the invention will be further described：
Embodiment：A kind of Multifunctional capacitor formula contact-making switch, capacitance plate 16 including housing 15, on housing 15,
Zero curve wire connection terminal, LED hot terminals, alternating current hot terminal, intermediate plate 17 and rear cover 18,17 He of intermediate plate
There is circuit board, for LED hot terminals for connecting LED lamp, the alternating current hot terminal is sub between rear cover 18
For connecting alternating current firewire, the circuit board includes current detection circuit 4, silicon-controlled 6, control module 11, zero cross detection circuit
3rd, on ＆ off switch 12, the positive and negative light modulation key 13 being connected with control module 11；
3 input terminal of zero cross detection circuit is connected to the firewire and zero curve of alternating current, the output terminal of this zero cross detection circuit
Control module 11 is connected to, for detecting zero point information in mains AC, so as to generate alternating current zero cross signal；
Current detection circuit 4, silicon-controlled 6 are in series between LED hot terminals and alternating current hot terminal,
Current detection circuit 4 is used to control for detecting real-time current size in alternating current firewire and generating sensed current signal, silicon-controlled 6
Flow into the starting current break-make of load；
The zero curve wire connection terminal, LED hot terminal are parallel with scr promoter current circuit 8, dynamic current dimension
Hold circuit 9；
The scr promoter current circuit 8 includes the resistance R20 of series connection and capacitance C7, capacitance C7 absorb LED lamp 14
Inverse electromotive force in switching process, while to drive in trigger signal to silicon-controlled 6 conducting moment offer starting current
Under it is silicon-controlled 6 conducting；
The dynamic current holding circuit 9, for maintaining the starting current of silicon-controlled 6 conducting, including reduction voltage circuit, electricity
Bridge J3, Hall current sensing device U12, the full-wave rectification amplifying circuit centered on amplifier U11, the voltage stabilizing on the basis of 1.25V
Source D3, NMOS device U7 and capacitance C8, the reduction voltage circuit for being used to provide constant low-voltage are located at electric bridge J3 and 1.25V for base
Between accurate source of stable pressure D3, NMOS device U7, NMOS device U7 one end is connected to silicon-controlled (6) by resistance R36 and electric bridge J3,
The NMOS device U7 other ends are grounded by resistance R23, R26, and the source of stable pressure D3 on the basis of the 1.25V is located at NMOS device U7's
Between grid and ground connection, the capacitance C8 is located between the source of stable pressure D3 on the basis of the gate pole and 1.25V of NMOS device U7, acts on
It is that the switch time of NMOS device U7 is delayed to avoid current spike, the full-wave rectification amplifying circuit is located at Hall current inductor
Between source of stable pressure D3 on the basis of part U12 and 1.25V, flow through the electric current of load while also flow through Hall current sensing device U12,
The current signal sensed is changed into voltage signal and is amplified by the full-wave rectification amplifying circuit centered on amplifier U11 by U12
With the reference input foot of source of stable pressure D3 being output to after rectification on the basis of 1.25V, it is assumed that convert voltage all as U, then flow through
The electric current of NMOS device U7 is by formula：
It draws, so the electric current for flowing through NMOS device U7 is set by U, when I is more than setting electric current, on the basis of 1.25V
The reference input terminal voltage of source of stable pressure D3 increases, and the source of stable pressure D3 negative and positive electrode impedances on the basis of 1.25V is caused to be lower, NMOS devices
The gate voltage of part U7 also accordingly reduces, thus I just reduces, so as to the constant current value in setting；
Optocoupler is provided between the dynamic current holding circuit 9 and control module 11 and transfers control circuit 10, this optocoupler
Control circuit 10 is transferred to be determined the need for according to starting current size so that dynamic current holding circuit 9；
The control module 11 controls silicon controlled control circuit 7 to generate trigger pulse electricity according to alternating current zero cross signal
Stream, and according to the whether enabled dynamic current holding circuit 9 of sensed current signal dynamic adjustment from current detection circuit 4, institute
Positive and negative light modulator 13 is stated for controlling the delay of trigger pulse electric current so as to fulfill the control to silicon-controlled 6 angle of flow, it is described to open
Key 12 is used to that trigger pulse electric current to be controlled to generate and close；
One switching power circuit, 1 input terminal is connected to the firewire and zero curve of alternating current, for mains AC to be converted into directly
It flows low tension and provides electric energy, the Switching Power Supply to control module 11, active rectification amplifying circuit 5, silicon controlled control circuit 7
1 output terminal of circuit is in series with overvoltage crowbar 2.
Active rectification amplifying circuit 5 is provided between the current detection circuit 4 and control module 11, when control module 11
It receives the sensed current signal from current detection circuit 4 and is less than setting value so that active rectification amplifying circuit 5 will detect electric current
Size is amplified the amplified sensed current signal of generation.
The silicon controlled control circuit 7 includes triode T3, the silicon-controlled U1 of optocoupler, resistance R41, triode T3 and resistance
R41 connects and is located between voltage end and ground connection, and the resistance R41 is in parallel with the input terminal of the silicon-controlled U1 of optocoupler, triode T3
Base stage be connected to control module 11,2 output terminals of the silicon-controlled U1 of optocoupler are connected respectively to silicon-controlled 6 gate pole and input
End.
The current detection circuit 4 uses Hall current sensing device U3, and the active rectification amplifying circuit 5 includes computing
Amplifier U4, PMOS device U9, triode T2, the operational amplifier U4 and PMOS device U9 are arranged in series and are respectively positioned on electric current
Between detection circuit 4 and control module 11, the collector and emitter of triode T2 is located at grid and the ground connection of PMOS device U9
Between, and the base stage of triode T2 is connected to control module 11, for receive for amplification and it is normal between the amplification that switches
Selection signal.
The optocoupler, which transfers control circuit 10, includes PMOS device U6, optocoupler U10, this PMOS device U6 by resistance with
Source of stable pressure D3 series connection on the basis of 1.25V, the output terminal of this optocoupler U10 are connected to the gate pole of PMOS device U6, and optocoupler U10's is defeated
Enter end and be connected to control module 11.
The present embodiment Multifunctional capacitor formula contact-making switch course of work is as follows：As shown in Figure 2, the contact of the present embodiment is opened
Pass includes switching power circuit 1, overvoltage crowbar 2, zero cross detection circuit 3, current detection circuit 4, active rectification amplification electricity
Road 5, silicon-controlled 6, silicon controlled control circuit 7, scr promoter current circuit 8, dynamic current holding circuit 9, optocoupler transfer control
Circuit 10 processed, control module 11 are using microcontroller, button 12 and connector 13, and specific circuit diagram please refers to Fig.2,3,4,5.
Input terminal connection city's voltage of switching power circuit 1 described in Fig. 5, Fig. 6, overvoltage protection described in output terminal connection figure 3
The input terminal of circuit 2, the mains signal of input first pass through the switching power circuit 1 be filtered and rectification after be depressured it is defeated
Go out 5V constant voltage sources, be microcontroller 11, silicon controlled control circuit 7, active rectification amplifying circuit 5, light after being further depressured
Coupling transfers control circuit 10 and provides power supply.
Input terminal connection city's voltage of zero cross detection circuit 3 described in Fig. 3, by just antiparallel two infraluminescences inside U2
Diode forms, since alternating current positive half period and negative half-cycle can make one of infrared light-emitting diode shine, and
Triode ON inside U2 is grounded by the current limliting of R5, R6, T1 goes out to obtain high level, and nearly 0V is crimped in each periodic alternating current
When, light emitting diode, there have been low level at T1, waits alternating voltages to be more than diode since pressure drop deficiency causes cut-off to turn on
T1 goes out by recovering high level again during conduction voltage drop, has just obtained the alternating current zero cross signal in each cycle in cycles.
This is signally attached to the interrupting input foot of Fig. 5 microcontrollers 11, and according to the setting of program, microcontroller 11 was obtaining
By certain delay after zero-signal, exporting high level by the pin for being connected to silicon controlled control circuit 7 described in Fig. 4 makes optocoupler
The input terminal infrared light-emitting diode conducting of silicon-controlled U1, the output terminal of U1 is the silicon-controlled of high voltage, and Fig. 4 institutes can be made after conducting
Show that silicon-controlled 6 obtain reliable trigger signal, the effect of the silicon-controlled U1 of optocoupler here is isolation, due to the reference ground of microcontroller 11
Reference not equal to silicon-controlled 6, so microcontroller 11 can not directly drive silicon-controlled 6.
The L of alternating current is through overcurrent sensing circuit 4 in Fig. 3, and silicon-controlled 6, L ' is drawn, load 14 is connected between L ' and N, this
A basic access is constituted, 14 acquisition electric currents are loaded when controlled silicon conducting and are lit, but if load 14 is LED light
It is inductive load since LED lamp is mostly Switching Power Supply during tool, when current switching when power is larger makes silicon-controlled hold
It is accidental switched off by excessively high inverse electromotive force.Another problem of elementary path be when bearing power factor is poor electric current and
Input voltage is there are certain phase shift, even if silicon-controlled obtain reliable trigger signal, the pressure difference at both ends is also enough, but due to triggering
Electric current not enough and cause it is silicon-controlled can not normal reliable open, flicker, the present invention in for both of these problems at load
Scr promoter current circuit 8 described in Fig. 4 in parallel, R20 and C7 constitute a buffer, absorb 14 switching process of inductive load
In inverse electromotive force, while also provide starting current for silicon-controlled 6 conducting moment, make silicon-controlled 6 smoothly conductings, due to C7
It is the capacitance of nanofarad range, so the influence of power factor (PF) will not be carried out to the load-strap of high power factor,
Another situation that traditional controllable silicon dimmer can be encountered is that electric current when Switching Power Supply works in LED lamp is non-
Linear discrete pulse, when current impulse is in the lowest point, electric current is less than the maintenance electric current of silicon-controlled minimum and causes unexpected pass
It closes, flickers, when bearing power is smaller, load current also results in silicon-controlled accident less than silicon-controlled extinction current
It closes, the present invention is loading 14 both ends parallel connection, one dynamic current holding circuit 9 shown in Fig. 3, bag for this problem
Include reduction voltage circuit, electric bridge J3, Hall current sensing device U12, full-wave rectification amplifying circuit, 1.25V centered on amplifier U11
On the basis of source of stable pressure D3, NMOS device U7 and capacitance C8, it is described to be located at electric bridge for providing the reduction voltage circuit of constant low-voltage
Between source of stable pressure D3, NMOS device U7 on the basis of J3 and 1.25V, NMOS device U7 one end is connected by resistance R36 and electric bridge J3
It is connected to silicon-controlled (6), the NMOS device U7 other ends are grounded by resistance R23, R26, source of stable pressure D3 on the basis of the 1.25V
Between the grid of NMOS device U7 and ground connection, the capacitance C8 is located at steady on the basis of the gate pole and 1.25V of NMOS device U7
Between potential source D3, effect is that the switch time of NMOS device U7 is delayed to avoid current spike, the full-wave rectification amplifying circuit position
Between the source of stable pressure D3 on the basis of Hall current sensing device U12 and 1.25V, flow through the electric current of load while also flow through Hall
The current signal sensed is changed into voltage signal and passes through the all-wave centered on amplifier U11 by current inductor part U12, U12
Rectification amplifying circuit amplify and rectification after be output to the reference input foot of source of stable pressure D3 on the basis of 1.25V, it is assumed that convert all
Voltage is U, then flows through the electric current of NMOS device U7 by formula：
It draws, so the electric current for flowing through NMOS device U7 is set by U, when I is more than setting electric current, on the basis of 1.25V
The reference input terminal voltage of source of stable pressure D3 increases, and the source of stable pressure D3 negative and positive electrode impedances on the basis of 1.25V is caused to be lower, NMOS devices
The gate voltage of part U7 also accordingly reduces, thus I just reduces, and so as to the constant current value in setting, D4 can protect D3 to make it
Surprisingly being raised from electric current causes to damage, and P-channel MOSFETU6 and optocoupler U10 constitute optocoupler and transfer control circuit 10, due to
Controllable current holding circuit 9 has enough operating currents or during without operating current without work loading 14, so this circuit can
So that silicon-controlled obtain enough maintenance electric currents when needed.
The current measurement circuit 4 described in Fig. 3 is looked next at, U3 here is the Hall current sensing device isolated, it
Input terminal is connected on silicon-controlled 6, and by hall sensing and internal amplification, the pulsating direct current of output 2/3.3V biasings is connected to list
The analog-to-digital conversion input pin of piece machine 11 is calculated, and converts ratio as 264mV/A, and the floating exported when bearing power is smaller is very
It is small, sampling error can be caused larger, if adding in amplifying circuit before microcontroller 11 is connected to, can cause, which ought connect load, is
Output outranges during 500W, and the present invention devises active rectification amplifying circuit shown in Fig. 25 for this problem, this circuit is by one
The amplifying circuit of a dual operational amplifier composition, P-channel MOSFETU9 and N-P-N triode T2 compositions, T2 are connected to microcontroller
11 common output foot, U9 and T2 form a channel selector, and acquiescence U9 is closed, and the signal of U3 acquisitions conveys after U4 amplifies
It is sampled to microcontroller 11, when microcontroller 11 samples obtained current value more than setting value certain time, output high level makes U9
Conducting, the current signal of U3 acquisitions then by U9 are transported to microcontroller 11 without amplification, so that signal amplification circuit 5 can be with
Load active accommodation amplification factor improves sampling precision.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of Multifunctional capacitor formula contact-making switch, capacitance plate (16), zero curve including housing (15), on housing (15)
Wire connection terminal, LED hot terminals, alternating current hot terminal, intermediate plate (17) and rear cover (18), the intermediate plate (17)
There is circuit board between rear cover (18), LED hot terminals is used to connect LED lamp (14), the alternating current firewire
Wire connection terminal is used to connect alternating current firewire, it is characterised in that：Including：The circuit board includes current detection circuit (4), silicon-controlled
(6), control module (11), zero cross detection circuit (3), the on ＆ off switch (12) being connected with control module (11), positive and negative light modulation key
(13)；
Zero cross detection circuit (3) input terminal is connected to the firewire and zero curve of alternating current, and the output terminal of this zero cross detection circuit connects
Control module (11) is connected to, for detecting zero point information in mains AC, so as to generate alternating current zero cross signal；
Current detection circuit (4), silicon-controlled (6) are in series between LED hot terminals and alternating current hot terminal,
For detecting real-time current size in alternating current firewire and generating sensed current signal, silicon-controlled (6) are used for current detection circuit (4)
Control flows into the starting current break-make of load；
The zero curve wire connection terminal, LED hot terminal are parallel with scr promoter current circuit (8), dynamic current maintains
Circuit (9)；
The scr promoter current circuit (8) includes the resistance R20 of series connection and capacitance C7, capacitance C7 absorb LED lamp 14 and open
Inverse electromotive force during pass, while to drive in trigger signal to the conducting moment offer starting current of silicon-controlled (6)
Under silicon-controlled (6) turn on；The dynamic current holding circuit (9), for maintaining the maintenance electric current that silicon-controlled (6) turn on；
Silicon controlled control circuit (7), this silicon controlled control circuit are provided between silicon-controlled (6) and control module (11)
(7) it is used to provide trigger pulse electric current to silicon-controlled (6)；
Optocoupler is provided between the dynamic current holding circuit (9) and control module (11) and transfers control circuit (10), this light
Coupling transfers control circuit (10) and is determined the need for according to starting current size so that dynamic current holding circuit (9)；
The control module (11) controls silicon controlled control circuit (7) to generate trigger pulse electricity according to alternating current zero cross signal
Stream, and according to the whether enabled dynamic current holding circuit of sensed current signal dynamic adjustment from current detection circuit (4)
(9), the positive and negative light modulation key (13) is used to control the delay of trigger pulse electric current so as to fulfill the control to silicon-controlled (6) angle of flow
System, the on ＆ off switch (12) are used to that trigger pulse electric current to be controlled to generate and close.
2. Multifunctional capacitor formula contact-making switch according to claim 1, it is characterised in that：The current detection circuit (4)
Active rectification amplifying circuit (5) is provided between control module (11), when control module (11) is received from current detecting electricity
The sensed current signal on road (4) is less than setting value so that active rectification amplifying circuit (5) is amplified life by size of current is detected
Into amplified sensed current signal.
3. Multifunctional capacitor formula contact-making switch according to claim 2, it is characterised in that：One switching power circuit (1) is defeated
Enter end and be connected to the firewire and zero curve of alternating current, for by mains AC be converted into DC low-voltage electricity and to control module (11),
Active rectification amplifying circuit (5), silicon controlled control circuit (7) provide electric energy, and switching power circuit (1) output terminal is in series with
Overvoltage crowbar (2).
4. Multifunctional capacitor formula contact-making switch described in any one of claim 1 to 3, it is characterised in that：It is described controllable
Silicon control circuit (7) includes triode T3, the silicon-controlled U1 of optocoupler, resistance R41, triode T3 and resistance R41 connect and is located at electricity
Between pressure side and ground connection, the resistance R41 is in parallel with the input terminal of the silicon-controlled U1 of optocoupler, and the base stage of triode T3 is connected to control
Module (11), 2 output terminals of the silicon-controlled U1 of optocoupler are connected respectively to the gate pole and input terminal of silicon-controlled (6).
5. the Multifunctional capacitor formula contact-making switch according to any one of claim 2~3, it is characterised in that：The electric current
Detection circuit (4) use Hall current sensing device U3, the active rectification amplifying circuit (5) include operational amplifier U4,
PMOS device U9, triode T2, the operational amplifier U4 and PMOS device U9 are arranged in series and are respectively positioned on current detection circuit
(4) between control module (11), the collector and emitter of triode T2 is located between grid and the ground connection of PMOS device U9,
And the base stage of triode T2 is connected to control module (11), for receive for amplification and it is normal between the amplification selection that switches
Signal.
6. Multifunctional capacitor formula contact-making switch described in any one of claim 1 to 3, it is characterised in that：The optocoupler
Transfer control circuit (10) include PMOS device U6, optocoupler U10, this PMOS device U6 by resistance with it is steady on the basis of 1.25V
Potential source D3 connects, the output terminal of this optocoupler U10 is connected to the gate pole of PMOS device U6, and the input terminal of optocoupler U10 is connected to control
Module (11).
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| CN101646289A (en) * | 2009-06-29 | 2010-02-10 | 潘忠浩 | Light-adjusting and speed-adjusting control circuit and control method thereof |
| CN102404917A (en) * | 2010-11-12 | 2012-04-04 | 孙善齐 | Reactance type LED lighting current control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101646289A (en) * | 2009-06-29 | 2010-02-10 | 潘忠浩 | Light-adjusting and speed-adjusting control circuit and control method thereof |
| CN102404917A (en) * | 2010-11-12 | 2012-04-04 | 孙善齐 | Reactance type LED lighting current control method |
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