CN102752901B - A kind of two-wire dimmer and control method thereof - Google Patents
A kind of two-wire dimmer and control method thereof Download PDFInfo
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Abstract
The invention discloses a kind of two-wire dimmer control method, two-wire dimmer is connected between AC power and load end, described two-wire dimmer is connected with described load end by driver, described method comprises: in the non-chopping cycle of specifying, and controls described chopping switch and is operated in linear condition; When described chopping switch of sampling is operated in linear condition, the voltage at two ends, is converted to square-wave signal, by described square-wave signal, obtains zero-acrross ing moment or the peak value moment of AC power, and exports zero cross signal or peak signal; According to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.The invention provides a kind of two-wire dimmer and control method thereof, for finding the correct zero crossing of AC power, controlling the correct copped wave of chopping switch.
Description
Technical field
The present invention relates to circuit field, particularly a kind of two-wire dimmer and control method thereof.
Background technology
Existing two-wire dimmer, is connected between electrical network (Hot) and load end (DimmedHot) usually, because the wiring of dimmer and electrical network and load end only has two, and therefore called after two-wire dimmer.
Two-wire dimmer inside can adopt MOSFET to manage usually, IGBT, or the semiconductor power device such as controllable silicon is as chopping switch.Can realize the control to line voltage by the break-make controlling chopping switch, the size of copped wave angle represents the size of dim signal.
Trailing edge dimmer utilizes controlled shutoff device (as MOSFET, IGBT etc.) to carry out the rear light regulating technology along phase angle copped wave as chopping switch.In trailing edge dimmer, control circuit accurately can control the phase angle of chopping voltage, but prerequisite to receive the zero cross signal by alternating voltage, namely from the zero-acrross ing moment of alternating voltage, after the time of control signal setting, start to turn off chopping switch, till next zero-acrross ing moment, along copped wave after realization.
See Fig. 1, this figure is a kind of circuit block diagram of existing trailing edge dimmer (two line trailing edge dimmer).
In two line trailing edge dimmer, the zero crossing of the general voltage determination alternating voltage by detecting chopping switch two ends, two inputs as zero cross detection circuit in Fig. 1 connect the two ends of chopping switch respectively.
If chopping switch is in saturation conduction state always, the pressure drop at chopping switch two ends is very little, and zero cross detection circuit is difficult to find zero-acrross ing moment by detecting chopping switch both end voltage.
In the prior art, the zero-acrross ing moment finding alternating voltage conveniently, needs exploratory copped wave, and namely turn off chopping switch in any time of alternating voltage, half ac cycle likely cuts away by this exploratory chopping way; And be purely resistive load for late-class circuit, or the LED driver that single-stage PFC circuit is formed, the loss of half ac cycle can cause very large output ripple electric current, causes the flicker of lamp.
Therefore, how providing a kind of two-wire dimmer and control method thereof, how to find the zero crossing of correct AC power, control the correct copped wave of chopping switch, is the problem that those skilled in the art need to solve.
Summary of the invention
The object of this invention is to provide a kind of two-wire dimmer and control method thereof, for finding the correct zero crossing of AC power, controlling the correct copped wave of chopping switch.
For solving the problem, the invention provides a kind of two-wire dimmer control method, two-wire dimmer is connected between AC power and load end, and described two-wire dimmer is connected with described load end by driver, and described method comprises:
In the non-chopping cycle of specifying, control chopping switch and be operated in linear condition;
When described chopping switch of sampling is operated in linear condition, the voltage at two ends, is converted to square-wave signal, by described square-wave signal, obtains zero-acrross ing moment or the peak value moment of AC power, and exports zero cross signal or peak signal;
According to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.
Preferably, described non-chopping cycle of specifying, before chopping cycle start time.
Preferably, described non-chopping cycle of specifying is consecutive periods.
Preferably, described chopping switch, in non-designated non-chopping cycle, is operated in saturation condition.
Preferably, the number of described non-chopping cycle of specifying is N/2, and wherein, N is positive integer.
The present invention also provides a kind of two-wire dimmer, is connected between AC power and load end, and described two-wire dimmer is connected with described load end by driver, and described two-wire dimmer comprises: chopping switch, zero cross detection circuit, control circuit;
Chopping switch, in the non-chopping cycle of specifying before chopping cycle, control described chopping switch be operated in linear condition by described control circuit, in remaining non-chopping cycle, described chopping switch is operated in saturation condition;
Zero cross detection circuit, when described chopping switch is operated in linear condition, described chopping switch both end voltage is AC sine wave, to sample the voltage at described chopping switch two ends, be converted to square-wave signal, by described square-wave signal, obtain the zero-acrross ing moment of AC power or peak value moment, and export zero cross signal or peak signal to control circuit;
Control circuit, receive zero cross signal or the peak signal of zero cross detection circuit output, according to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.
Preferably, the number of described non-chopping cycle of specifying is N/2, and wherein, N is positive integer.
Preferably, described driver is uncontrollable rectifier circuit, or single-level power factor circuit, or active/passive power factor circuit, or two-stage circuit.
Preferably, described chopping switch comprises the first switching tube Q1 and second switch pipe Q2, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1 and the second diode D2; The anode of the first diode D1 and the second diode D2 is connected to the two ends of the first switching tube Q1 and second switch pipe Q2; The negative electrode of the first diode D1 and the second diode D2 is connected with the first resistance R1, the second resistance R2, is input to the inverting input of comparator IC1, compares with the reference voltage of normal phase input end after the first resistance R1, the second resistance R2 dividing potential drop.
Preferably, described chopping switch comprises the first switching tube Q1, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1; The anode of the first diode D1 is connected to one end of the first switching tube Q1, the negative electrode of the first diode D1 is connected with the first resistance R1, the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage of normal phase input end.
Preferably, described chopping switch is the bidirectional switch that rectifier bridge and the first switching tube Q1 form, described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, first switching tube Q1 two ends connect rectification bridge output end, rectification bridge output end is also connected with the first resistance R1 and the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage of normal phase input end.
Compared with above-mentioned prior art, two-wire dimmer control method described in the embodiment of the present invention, comprising: in the non-chopping cycle of specifying, and controls described chopping switch and is operated in linear condition; When described chopping switch of sampling is operated in linear condition, the voltage at two ends, is converted to square-wave signal, by described square-wave signal, can obtains zero-acrross ing moment or the peak value moment of AC power easily, and export zero cross signal or peak signal; According to this zero cross signal or peak signal, just can realize accurately controlling the break-make of described chopping switch.
Two-wire dimmer described in the embodiment of the present invention and control method hinge structure thereof, have following technique effect:
1, when needing in the several ac cycles before copped wave (the non-chopping cycle of specifying), control chopping switch and be operated in linear condition, dimmer internal control circuit utilizes the voltage at chopping switch two ends, not only easily find the peak (90 degree) of alternating voltage or cross zero position, and chopping switch both end voltage very low (about 10V), do not affect the operating state of rear class driver.
2, two-wire dimmer controls chopping switch and is operated in correct copped wave state, ensures that post-stage drive circuit can detect correct chopping signal simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of existing described two-wire dimmer;
Fig. 2 is two-wire dimmer control method first embodiment flow chart of the present invention;
Fig. 3 is two-wire dimmer first embodiment circuit diagram of the present invention;
Fig. 4 is voltage Vo, the chopping switch both end voltage Vs of two-wire dimmer of the present invention and the graph of a relation of zero cross detection circuit output voltage Vdo;
Fig. 5 is two-wire dimmer second embodiment circuit diagram of the present invention;
Fig. 6 is two-wire dimmer of the present invention 3rd embodiment circuit diagram.
Embodiment
The invention provides a kind of two-wire dimmer and control method thereof, for finding the correct zero crossing of AC power, controlling the correct copped wave of chopping switch.
For convenience of description, definition: the cycle that dimmer exports chopping voltage is chopping cycle, and the cycle not exporting chopping voltage is non-chopping cycle.
Wherein, chopping voltage is in the half period of the input ac power of dimmer, has the voltage of lasting zero level.
In the non-chopping cycle of the predetermined number of chopping switch before chopping cycle, control chopping switch and be operated in linear condition, in remaining non-chopping cycle, chopping switch is operated in saturation condition.
In order to make those skilled in the art understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 2, this figure is two-wire dimmer control method first embodiment flow chart of the present invention.
Two-wire dimmer is connected between AC power and load end, and described two-wire dimmer is connected with described load end by driver.
Described in first embodiment of the invention, two-wire dimmer control method comprises:
S100, in the non-chopping cycle of specifying, control chopping switch be operated in linear condition.
Described non-chopping cycle of specifying, specifically before chopping cycle start time.
Can also comprise before step S100: in non-designated non-chopping cycle, control described chopping switch and be operated in saturation condition.
When S200, described chopping switch of sampling are operated in linear condition, the voltage at two ends, is converted to square-wave signal, by described square-wave signal, obtains zero-acrross ing moment or the peak value moment of AC power, and exports zero cross signal or peak signal;
S300, according to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.
Described non-chopping cycle of specifying is consecutive periods.In the non-chopping cycle of continuous print, sampling chopping switch both end voltage, obtains continuous print square-wave signal, gets multiple low level central instant (or high level central instant), to obtain zero-acrross ing moment (or peak value moment) comparatively accurately.
In number (be specifically as follows N/2, wherein, N the is positive integer) ac cycle of described non-chopping cycle of specifying (being 2 ac cycles in Fig. 4), control chopping switch and be operated in linear condition.
When the chopping switch in two-wire dimmer, complete conducting under the control of control circuit, when being namely operated in saturation condition, the pressure drop of chopping switch two ends is very little, is similar to zero, the AC supply voltage approximately equal of two-wire dimmer output voltage and input; When being operated in linear condition under the control of chopping switch at control circuit, chopping switch both end voltage is synchronous alternating voltage with input ac power, and two-wire dimmer output voltage is the AC supply voltage of input and the difference of chopping switch both end voltage; When turning off under the control of chopping switch at control circuit, two-wire dimmer exports no-voltage.
Due to described chopping switch be operated in linear condition time, the voltage in phase of the AC power of its two ends pressure drop and input, therefore, detect zero-acrross ing moment (zero crossing) or the peak value moment (peak point) of chopping switch both end voltage, then this zero-acrross ing moment or peak value moment are also zero-acrross ing moment or the peak value moment of input ac power.In order to obtain zero-acrross ing moment or peak value moment accurately from chopping switch both end voltage, therefore, by the voltage at chopping switch two ends by comparison circuit, be converted to square-wave signal, zero-acrross ing moment or peak value moment can be obtained accurately from square-wave signal.
Two-wire dimmer control method described in the embodiment of the present invention, due in the non-chopping cycle (the non-chopping cycle of specifying) of the predetermined number before chopping cycle, control described chopping switch and be operated in linear condition, in remaining non-chopping cycle, described chopping switch is operated in saturation condition; When described chopping switch is operated in linear condition, described chopping switch both end voltage is AC sine wave, to sample the voltage at described chopping switch two ends, be converted to square-wave signal, by described square-wave signal, zero-acrross ing moment or the peak value moment of AC power can be obtained easily, and export zero cross signal or peak signal; According to this zero cross signal or peak signal, just can realize accurately controlling the break-make of described chopping switch.
Two-wire dimmer first embodiment circuit diagram of the present invention see Fig. 3 and Fig. 4, Fig. 3; Fig. 4 is voltage Vo, the chopping switch both end voltage Vs of two-wire dimmer of the present invention and the graph of a relation of zero cross detection circuit output voltage Vdo.
Two-wire dimmer described in first embodiment of the invention, is connected between input ac power and load end.Described two-wire dimmer is connected with described load end by driver.
Described two-wire dimmer comprises: chopping switch, zero cross detection circuit, control circuit.
Chopping switch, in the non-chopping cycle of the predetermined number before chopping cycle, control described chopping switch be operated in linear condition by described control circuit, in remaining non-chopping cycle, described chopping switch is operated in saturation condition.
Zero cross detection circuit, when described chopping switch is operated in linear condition, described chopping switch both end voltage is AC sine wave, to sample the voltage at described chopping switch two ends, be converted to square-wave signal, by described square-wave signal, obtain zero-acrross ing moment or the peak value moment of AC power.
Control circuit, receive zero cross signal or the peak signal of zero cross detection circuit output, according to this zero cross signal, output signal controls the break-make of described chopping switch.
The number of the non-chopping cycle of specifying before chopping cycle starts (is specifically as follows N/2, N is positive integer) ac cycle interior (being 2 ac cycles in Fig. 4), control chopping switch and be operated in linear condition, the difference of AC-input voltage Vin and output voltage Vo is the pressure drop Vs at chopping switch two ends.
In Fig. 4, in Vo oscillogram, dotted line is Vin; Vs is sinusoidal wave.
As shown in Figure 4, in two non-chopping cycles before chopping cycle starts, the chopping switch described in control is operated in linear condition, and in remaining non-chopping cycle, controls chopping switch and be operated in saturation condition.
Non-chopping cycle of specifying of the present invention, in the present embodiment, for aforesaid, chopping cycle start before, two non-chopping cycles of continuous print; Non-designated non-chopping cycle, for except these two non-chopping cycles, all the other non-chopping cycles.
Can find out, the present invention preferably specifies non-chopping cycle, for chopping cycle start before N/2 ac cycle, N is positive integer.
Compare with a level signal Vref in zero cross detection circuit, comparing the zero cross signal obtained is square-wave signal, and be namely low level at the zero-acrross ing moment of Vin, all the other moment are high level.As shown in Figure 4, the high level mid point of square wave is peak point, and the low level mid point of square wave is zero crossing.
The method finding zero crossing can have multiple, as following three kinds of modes:
1, in half ac cycle, get the mid point of square wave high level, with the moment of this point for peak value moment, be zero-acrross ing moment through the moment of 1/4 ac cycle from peak value moment.
2, in an ac cycle, getting the low level mid point of square wave, with the moment of this point for zero-acrross ing moment, through the moment of half ac cycle from zero-acrross ing moment, is the zero-acrross ing moment that next cycle starts.
3, in multiple ac cycle, get the mid point (or low level mid point) of square wave high level continuously, the moment often between adjacent two mid points is zero-acrross ing moment (or peak value moment).
When chopping switch needs to be operated in copped wave state, two-wire dimmer internal control circuit needs alternating voltage zero-crossing signal to be detected, thus the size at copped wave angle as required, send chopping control signal and turn off to control chopping switch.
The first step: when non-chopping cycle starts, control circuit controls chopping switch and is operated in complete conducting state, i.e. saturation condition.
Second step: in the non-chopping cycle of the predetermined number (as 1 ~ 2 or multiple) before chopping cycle, control circuit controls chopping switch in the linear zone (if the conduction voltage drop of chopping switch is at about 10V) being operated in conducting state, by the voltage at chopping switch two ends of sampling, obtain square-wave signal through conversion, find the peak (90 degree of positions) of alternating voltage or cross zero position.
3rd step: after the peak (90 degree) finding alternating voltage or mistake zero position, in next cycle, according to the copped wave angle of control signal instruction, after the time that copped wave angle is corresponding from zero-acrross ing moment, or after the time that copped wave angle is corresponding from peak value moment, control chopping switch and turn off.
Such as copped wave angle A is 45 degree, and the cycle T of AC power (50Hz) is 20ms, and half ac cycle is 10ms, then 45 degree rear along copped wave angle, and corresponding chopping voltage is the time of zero
for 2.5ms, then from zero-acrross ing moment through (10ms-2.5ms), namely control after 7.5ms chopping switch turn off, until next zero-acrross ing moment.
Can also comprise the following steps in internal drive:
4th step: internal drive control circuit detects that copped wave angle changes, confirms that chopping switch is operated in copped wave state, and in next or several ac cycle again, in maximum copped wave angle, control group match circuit is operated in Low ESR.
5th step: dimmer internal control circuit controls chopping switch according to the zero crossing of accurate alternating voltage and is operated in suitable copped wave state.
Two-wire dimmer described in the embodiment of the present invention can with the rear class drive circuit of any circuit topology, as uncontrollable rectifier mode, and single-stage PFC circuit, active/passive pfc circuit, two-stage circuit (pfc circuit+DC/DC circuit) etc.
As shown in Figure 3, two-wire dimmer described in first embodiment of the invention, chopping switch comprises the first switching tube Q1 and second switch pipe Q2, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1 and the second diode D2.The anode of the first diode D1 and the second diode D2 is connected to the two ends of the first switching tube Q1 and second switch pipe Q2; The negative electrode of the first diode D1 and the second diode D2 is connected with the first resistance R1, the second resistance R2, is input to the inverting input of comparator IC1, compares with the reference voltage V ref of normal phase input end after the first resistance R1, the second resistance R2 dividing potential drop.
First switching tube Q1 and second switch pipe Q2 is specially metal-oxide-semiconductor Q1 and Q2, zero cross detection circuit is connected to the two ends of chopping switch Q1 and Q2 by the anode of diode D1 and D2, when being operated in linear condition in the non-chopping cycle of the predetermined number of chopping switch before chopping cycle, by the first diode D1 or the second diode D2, by the voltage drop detection at metal-oxide-semiconductor Q1 or Q2 two ends out, and after dividing potential drop by the first resistance R1 and the second resistance R2, be input to the inverting input of comparator IC1, after compared with the reference voltage V ref of normal phase input end, export zero cross signal (square wave) Vdo, this zero cross signal is delivered in control circuit, control circuit is according to control signal and zero cross signal, the shutoff moment of accurate control chopping switch, to reach the object accurately controlling copped wave phase angle.
Due to the first resistance R1 and the second resistance R2, by the first diode D1 or the second diode D2, be connected in parallel on the first switching tube Q1 or the second switch pipe Q2 two ends of chopping switch, therefore, the pressure drop at chopping switch Q1 or Q2 two ends, when it is operated in linear condition, change along with the change of AC power, also namely with input AC power same-phase.After dividing potential drop by the first resistance R1 and the second resistance R2, the inverting input of comparator IC1 is input to by with the synchronous sampled signal of AC power, compare with the base-level signal Vref of normal phase input end, a square-wave signal can be obtained at the output of comparator IC1.In the present embodiment, the low level central instant of this square-wave signal is the zero-acrross ing moment of AC power, and the high level moment is the peak value moment of AC power.
When pressure drop when chopping switch is operated in linear condition is very low, the first resistance R1 can omit.
See Fig. 5, this figure is two-wire dimmer second embodiment circuit diagram of the present invention.
The difference of relative first embodiment of two-wire dimmer second embodiment of the present invention is, described chopping switch is a single-way switch pipe, and corresponding zero cross detection circuit only has a diode D1.
The chopping switch of two-wire dimmer of the present invention comprises the first switching tube Q1, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1.The anode of the first diode D1 is connected to one end of the first switching tube Q1, the negative electrode of the first diode D1 is connected with the first resistance R1, the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage V ref of normal phase input end.Through comparator IC1 relatively after, export zero cross signal (square wave) Vdo, deliver in control circuit by this zero cross signal, control circuit is according to control signal and zero cross signal, the shutoff moment of accurate control chopping switch, to reach the object accurately controlling copped wave phase angle.
When pressure drop when chopping switch is operated in linear condition is very low, the first resistance R1 can omit.
See Fig. 6, this figure is two-wire dimmer of the present invention 3rd embodiment circuit diagram.
The difference of relative second embodiment of two-wire dimmer of the present invention 3rd embodiment is, described chopping switch is the bidirectional switch of rectifier bridge and single-way switch pipe composition.Owing to there being the effect of rectifier bridge, therefore zero cross detection circuit does not need diode.
The chopping switch of two-wire dimmer described in third embodiment of the invention is the bidirectional switch that rectifier bridge and the first switching tube Q1 form.
Described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2.First switching tube Q1 two ends connect rectification bridge output end, rectification bridge output end is also connected with the first resistance R1 and the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage of normal phase input end.
Through comparator IC1 relatively after, export zero cross signal (square wave) Vdo, deliver in control circuit by this zero cross signal, control circuit is according to control signal and zero cross signal, the shutoff moment of accurate control chopping switch, to reach the object accurately controlling copped wave phase angle.
When pressure drop when chopping switch is operated in linear condition is very low, the first resistance R1 can omit.
The above is only the preferred implementation of two-wire dimmer of the present invention and control method thereof; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a two-wire dimmer control method, two-wire dimmer is connected between AC power and load end, and described two-wire dimmer is connected with described load end by driver, it is characterized in that, described method comprises:
In the non-chopping cycle of specifying, control chopping switch and be operated in linear condition;
When described chopping switch of sampling is operated in linear condition, the voltage at two ends, is converted to square-wave signal, by described square-wave signal, obtains zero-acrross ing moment or the peak value moment of described chopping switch both end voltage; Obtained zero-acrross ing moment or the peak value moment of AC power by the zero-acrross ing moment of described chopping switch both end voltage or peak value moment, and export zero cross signal or peak signal;
According to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.
2. two-wire dimmer control method according to claim 1, is characterized in that, described non-chopping cycle of specifying, before chopping cycle start time.
3. two-wire dimmer control method according to claim 1, is characterized in that, described non-chopping cycle of specifying is consecutive periods.
4. two-wire dimmer control method according to claim 1, is characterized in that, described chopping switch, in non-designated non-chopping cycle, is operated in saturation condition.
5. two-wire dimmer control method according to claim 1, is characterized in that, the number of described non-chopping cycle of specifying is N/2, and wherein, N is positive integer.
6. a two-wire dimmer, is connected between AC power and load end, and described two-wire dimmer is connected with described load end by driver, it is characterized in that, described two-wire dimmer comprises: chopping switch, zero cross detection circuit, control circuit;
Chopping switch, in the non-chopping cycle of specifying before chopping cycle, control described chopping switch be operated in linear condition by described control circuit, in remaining non-chopping cycle, described chopping switch is operated in saturation condition;
Zero cross detection circuit, when described chopping switch is operated in linear condition, described chopping switch both end voltage is AC sine wave, to sample the voltage at described chopping switch two ends, be converted to square-wave signal, by described square-wave signal, obtain zero-acrross ing moment or the peak value moment of described chopping switch both end voltage; Obtained zero-acrross ing moment or the peak value moment of AC power by the zero-acrross ing moment of described chopping switch both end voltage or peak value moment, and export zero cross signal or peak signal to control circuit;
Control circuit, receive zero cross signal or the peak signal of zero cross detection circuit output, according to this zero cross signal or peak signal, output signal controls the break-make of described chopping switch.
7. two-wire dimmer according to claim 6, is characterized in that, the number of described non-chopping cycle of specifying is N/2, and wherein, N is positive integer.
8. two-wire dimmer according to claim 6, is characterized in that, described driver is uncontrollable rectifier circuit, or single-level power factor circuit, or active/passive power factor circuit, or two-stage circuit.
9. two-wire dimmer according to claim 6, it is characterized in that, described chopping switch comprises the first switching tube Q1 and second switch pipe Q2, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1 and the second diode D2; The anode of the first diode D1 and the second diode D2 is connected to the two ends of the first switching tube Q1 and second switch pipe Q2; The negative electrode of the first diode D1 and the second diode D2 is connected with the first resistance R1, the second resistance R2, is input to the inverting input of comparator IC1, compares with the reference voltage of normal phase input end after the first resistance R1, the second resistance R2 dividing potential drop.
10. two-wire dimmer according to claim 6, is characterized in that, described chopping switch comprises the first switching tube Q1, and described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, the first diode D1; The anode of the first diode D1 is connected to one end of the first switching tube Q1, the negative electrode of the first diode D1 is connected with the first resistance R1, the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage of normal phase input end.
11. two-wire dimmers according to claim 6, it is characterized in that, described chopping switch is the bidirectional switch that rectifier bridge and the first switching tube Q1 form, described zero cross detection circuit comprises comparator IC1, the first resistance R1, the second resistance R2, first switching tube Q1 two ends connect rectification bridge output end, rectification bridge output end is also connected with the first resistance R1 and the second resistance R2, be input to the inverting input of comparator IC1 after first resistance R1, the second resistance R2 dividing potential drop, compare with the reference voltage of normal phase input end.
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| CN103841704B (en) * | 2012-11-23 | 2018-07-27 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
| CN103957636A (en) * | 2014-04-28 | 2014-07-30 | Tcl-罗格朗国际电工（惠州）有限公司 | Two-wire dimming circuit |
| JP6481943B2 (en) * | 2015-09-10 | 2019-03-13 | パナソニックＩｐマネジメント株式会社 | Light control device |
| CN107102183B (en) * | 2017-06-20 | 2023-07-21 | 海盐新跃电器有限公司 | Circuit for controlling hardware detection waveform output and physical on-off method thereof |
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| CN101984547B (en) * | 2010-10-21 | 2013-01-16 | 浙江瑞德电子科技有限公司 | Silicon controlled chopping power regulation driving device |
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| CN1068665A (en) * | 1992-07-04 | 1993-02-03 | 温建红 | A kind of chopped wave compensation type voltage-stabilizer for alternating current |
| CN201656913U (en) * | 2010-05-12 | 2010-11-24 | 刘跃兵 | Closed loop control system used for adjusting power of motor |
| CN202085350U (en) * | 2011-04-20 | 2011-12-21 | 英飞特电子（杭州）有限公司 | Two-wire dimmer |
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| CN102752901A (en) | 2012-10-24 |
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