CN102752900B

CN102752900B - Method for controlling auxiliary source circuit of two-line light modulator

Info

Publication number: CN102752900B
Application number: CN201110083892.2A
Authority: CN
Inventors: 邹剑华; 夏清峰; 任丽君; 华桂潮
Original assignee: Led One Hangzhou Co Ltd
Current assignee: Led One Hangzhou Co Ltd
Priority date: 2011-04-02
Filing date: 2011-04-02
Publication date: 2014-10-29
Anticipated expiration: 2031-04-02
Also published as: WO2012136044A1; CN102752900A

Abstract

The invention provides a method for controlling an auxiliary source circuit of a two-line light modulator. The auxiliary source circuit comprises: an auxiliary source capacitor and a cut-off switch which form a series branch, and a chopping switch connected in parallel with the series branch. The method comprises the following steps: detecting a current auxiliary source voltage, and determining whether the auxiliary source voltage is lower than a set lower limiting value, if the auxiliary source voltage is lower than the set lower limiting value, further determining whether the chopping switch is in a chopping period, if the chopping switch is in the chopping period, the auxiliary source capacitor being not charged, and if the chopping switch is not in the chopping period, the auxiliary source capacitor being charged. With the method in an embodiment, defects in the prior art can be solved, and the circuit is simple and is relative low in cost.

Description

A kind of control method of auxiliary source circuit of two-wire dimmer

Technical field

The present invention relates to accessory power supply technical field, particularly relate to a kind of control method of auxiliary source circuit of two-wire dimmer.

Background technology

Dimmer is a kind of for changing the luminous flux of lighting device light source, a kind of electric device of adjusting illumination level.Dimmer is connected between electrical network (Hot) and load end (Dimmed Hot) conventionally, and the current effective value of inputting light source by change reaches the object of light modulation.

The line of existing conventional dimmer and electrical network and load end only has two, therefore can be called two-wire dimmer.Two-wire dimmer inside can adopt MOSFET (Metal-Oxide-SemiconductorField-Effect Transistor conventionally, metal-oxide layer-semiconductor-field-effect transistor), the semiconductor power device such as IGBT (Insulated GateBipolar Transistor, insulated gate bipolar transistor) or controllable silicon is as chopping switch.By controlling the break-make of described chopping switch, can realize the control to line voltage, the size of the copped wave angle of chopping switch represents the size of dim signal.

In order to adapt to the demand of color illumination system, require two-wire dimmer can there is the multiple regulative modes such as color and/or brightness.Conventionally the inside of two-wire dimmer has more circuit, even needs with digital control approaches such as single-chip microcomputers, therefore need to be produced as in the inside of two-wire dimmer the accessory power supply of single-chip microcomputer or All other routes power supply.

With reference to Fig. 1, be the auxiliary source circuit figure of the two-wire dimmer of prior art.Accessory power supply 124 in this circuit is when chopping switch 110 and 112 all ends, and the voltage drop while utilizing chopping switch cut-off is to capacitor C 1 charging.At the positive half cycle of sine wave, by body diode and the load of diode D1, capacitor C 1, chopping switch 112, form charge circuit; At sinusoidal wave negative half period, by body diode and the load of diode D2, capacitor C 1, chopping switch 112, form charge circuit, then through accessory power supply, 124 voltage stabilizings obtain boost voltage Vcc.

Because obtaining of this boost voltage Vcc is that the voltage that utilizes chopping switch cut-off to produce obtains, therefore, obtain minimum boost voltage just needs a minimum copped wave angle (not conducting of chopping switch).And even chopping switch has (very little angle) the not conducting of very short time, all can to circuit, bring very large electromagnetic interference due to the sudden change of electric current and voltage; Meanwhile, in capacitor C 1, can bear the crest voltage of line voltage, after accessory power supply 124, be transformed into low-voltage signal Vcc, give other circuit supplies, make the cost of this circuit high, efficiency is low.

Summary of the invention

In view of this, the object of this invention is to provide a kind of control method of auxiliary source circuit of two-wire dimmer, can solve defect of the prior art, and circuit is simple, cost is lower.

For achieving the above object, the invention provides following scheme: a kind of control method of auxiliary source circuit of two-wire dimmer, described auxiliary source circuit comprises: the auxiliary source electric capacity and cut-out switch that form series arm; The chopping switch in parallel with described series arm; Said method comprising the steps of:

Step 1: start;

Step 2: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step 3; If not, return to step 1;

Step 3: judge that described chopping switch whether in chopping cycle, if so, controls described auxiliary source electric capacity and do not charge, return to step 1; If not, control described auxiliary source capacitor charging, return to step 1.

Preferably, in described step 3, described auxiliary source electric capacity is not charged as: turn-off described cut-out switch; Described auxiliary source capacitor charging is: turn-off described in described chopping switch and conducting and cut off switch.

Preferably, in described step 3,

Described auxiliary source electric capacity is not charged as: judge that whether described chopping voltage control signal is chopping switch described in conducting, if so, chopping switch described in conducting; If not, turn-off described chopping switch and turn-off described cut-out switch;

Described auxiliary source capacitor charging is: turn-off described in described chopping switch and conducting and cut off switch.

Preferably, after step 1, before step 2, described method also comprises:

Step 11: detect current auxiliary source voltage, judge that whether described auxiliary source voltage is higher than capping value, if so, turn-off described cut-out switch, return to step 11; If not, enter step 2.

Preferably, after step 1, before entering step 11, also comprise:

Step 21: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than the false voltage value of setting, if so, enters step 22; If not, enter step 11;

Step 22: output failure control signal, turn-offs described cut-out switch;

Step 23: judge that described auxiliary source voltage, whether lower than the false voltage value of setting, if so, enters step 11; If not, return to step 22.

Preferably, after step 1, before step 2, described method also comprises:

Step 11: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step 12; If not, enter step 2;

Step 12: judge that whether described chopping voltage control signal is chopping switch described in conducting, if so, chopping switch described in conducting, returns to step 11; If not, turn-off described chopping switch and turn-off described cut-out switch, return to step 11.

Preferably, after step 1, before entering step 11, also comprise:

Step 22: output failure control signal, turn-offs described cut-out switch;

The embodiment of the present invention also provides a kind of control method of auxiliary source circuit of two-wire dimmer, and described auxiliary source circuit comprises: rectifying device and auxiliary source capacitances in series, form a series arm; Cut off switch in parallel with described series arm, form a parallel branch; Chopping switch is connected with described parallel branch again; Said method comprising the steps of:

Step 1: start;

Preferably, in described step 3, described auxiliary source electric capacity is not charged as: described in conducting, cut off switch; Described auxiliary source capacitor charging is: turn-off described cut-out switch.

Preferably, after step 1, before step 2, described method also comprises:

Step 11: detect current auxiliary source voltage, judge that whether described auxiliary source voltage is higher than capping value, if so, cut off switch described in conducting, return to step 11; If not, enter step 2.

Preferably, after step 1, before entering step 11, also comprise:

Step 22: output failure control signal, cuts off switch described in conducting;

According to specific embodiment provided by the invention, the invention discloses following technique effect:

Method described in the embodiment of the present invention, when auxiliary source voltage is during lower than a certain preset value, at least one chopping switch is turn-offed, the load of the alternative chopping switch turn-offing of auxiliary source electric capacity and AC power, described two-wire dimmer output forms loop, AC power is given described auxiliary source capacitor charging, obtains auxiliary source voltage; When auxiliary source voltage reaches after certain value, make the complete conducting of chopping switch, be operated in saturation condition, stop, to auxiliary source capacitor charging, with this, reducing the loss of circuit; When described two-wire dimmer is during in chopping cycle, cut off the charge circuit to described auxiliary source electric capacity.

Adopt the control method of the embodiment of the present invention, because chopping switch is operated on off state, and nonlinear state, can be so that the auxiliary source circuit loss of described two-wire dimmer be very little, efficiency is high; Meanwhile, adopt described method and device, can be so that the auxiliary source circuit of described two-wire dimmer need minimum copped wave angle restriction, so electromagnetic interference is little.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the auxiliary source circuit figure of the two-wire dimmer of prior art;

Fig. 2 is the structure chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one;

Fig. 3 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one;

Fig. 4 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two;

Fig. 5 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention three;

Fig. 6 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention four;

Fig. 7 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention five;

Fig. 8 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention six;

Fig. 9 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention seven;

Figure 10 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention eight;

Figure 11 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention nine;

Figure 12 is the chopping voltage control signal oscillogram of the embodiment of the present invention;

The first implementation circuit diagram of the auxiliary source circuit of Figure 13 embodiment of the present invention;

Figure 14 is the output voltage waveform of circuit shown in Figure 13;

The second implementation circuit diagram of the auxiliary source circuit of Figure 15 embodiment of the present invention;

Figure 16 is the output voltage waveform of circuit shown in Figure 15;

The third implementation circuit diagram of the auxiliary source circuit of Figure 17 embodiment of the present invention;

The 4th kind of implementation circuit diagram of the auxiliary source circuit of Figure 18 embodiment of the present invention;

Figure 19 is the structure chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two;

Figure 20 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention ten;

Figure 21 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 11;

Figure 22 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 12;

Figure 23 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 13;

Figure 24 is the 5th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention;

Figure 25 is the output voltage waveform of circuit shown in Figure 24;

Figure 26 is the 6th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention;

Figure 27 is the output voltage waveform of circuit shown in Figure 26;

Figure 28 is the 7th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention;

Figure 29 is the 8th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

The control method of the auxiliary source circuit of two-wire dimmer described in the embodiment of the present invention, when auxiliary source voltage is during lower than a certain preset value, at least one chopping switch is turn-offed, the load of the alternative chopping switch turn-offing of auxiliary source electric capacity and AC power, described two-wire dimmer output forms loop, AC power is given described auxiliary source capacitor charging, obtains auxiliary source voltage; When auxiliary source voltage reaches after certain value, make the complete conducting of chopping switch, be operated in saturation condition, stop, to auxiliary source capacitor charging, with this, reducing the loss of circuit; When described two-wire dimmer is during in chopping cycle, cut off the charge circuit to described auxiliary source electric capacity.

The auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention comprises: chopping switch, auxiliary source electric capacity, cut-out switch.Described auxiliary source electric capacity and described cut-out switch form series arm; Described chopping switch is in parallel with described series arm.Concrete, can be as shown in Figure 2.

With reference to Fig. 2, it is the structure chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one.The accessory power supply of described two-wire dimmer can comprise: chopping switch 10, auxiliary source electric capacity 20, cut-out switch 30 and control device 40.

Described auxiliary source electric capacity 20 forms series arm with described cut-out switch 30; Described chopping switch 10 is in parallel with described series arm.

When described cut-out switch 30 conductings and 10 shutoff of described chopping switch, described auxiliary source electric capacity 20 is in parallel with described chopping switch 10, described auxiliary source electric capacity 20 chargings; When described cut-out switch 30 shutoffs or described chopping switch 10 and the 30 equal conducting of cut-out switch, described auxiliary source electric capacity 20 stops charging.

Described control device 40, input signal is Vg and Vb, output first signal V1 and secondary signal V2.Input signal wherein.Wherein, the chopping voltage control signal that input signal Vg is two-wire dimmer, input signal Vb is chopping cycle detection signal.Described chopping cycle detection signal Vb and chopping voltage control signal Vg can be produced by control circuit of chopping (not shown this circuit).

Wherein: described chopping voltage control signal Vg exports the signal of chopping voltage in chopping cycle for controlling described two-wire dimmer, at auxiliary source electric capacity 20 not under charge condition, when described chopping voltage control signal Vg output makes the signal of chopping switch 10 shutoffs, chopping switch 10 turn-offs, and described two-wire dimmer is output as no-voltage; When described chopping voltage control signal Vg output makes the signal of chopping switch 10 conductings, chopping switch 10 conductings, described two-wire dimmer is output as non-zero voltage.If chopping switch 10 break-make alternately within the half period of AC power, two-wire dimmer output chopping voltage, if chopping switch 10 in AC power conducting all the time in the cycle, two-wire dimmer output voltage is the alternating voltage of input.

Wherein, described chopping cycle refers to: in the half period of input ac power, no-voltage and non-zero voltage alternately appear in two-wire dimmer output voltage; Described non-chopping cycle refers to: the cycle that there is no lasting no-voltage in dimmer output voltage.Two-wire dimmer is when chopping cycle, and output voltage V o is chopping voltage.

Chopping cycle detection signal Vb is for detecting the signal of control circuit of chopping output chopping cycle, comprise two states, state one and state two,, when control circuit of chopping is controlled two-wire dimmer output voltage in chopping cycle, chopping cycle detection signal Vb is state one; When control circuit of chopping is controlled two-wire dimmer output voltage in non-chopping cycle, chopping cycle detection signal Vb is state two.Described control device 40 is for detection of auxiliary source voltage, and according to described auxiliary source voltage vcc and input signal Vg, output first signal V1 and secondary signal V2, control respectively described chopping switch 10 and cut off conducting or the shutoff of switch 30.

After described chopping switch 10 and output load series connection, be connected in parallel on input power Vin two ends.

Described output load can be the load of Switching Power Supply class, as LED driver, and gas discharge lamp ballast etc.; The light source that described output load drives can be LED lamp, fluorescent lamp, Halogen lamp LED etc., and light source like other property class.

Corresponding to the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one, the embodiment of the present invention provides a kind of accessory power supply control method of two-wire dimmer.

With reference to Fig. 3, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one.Described method specifically comprises the following steps:

Step S101: start;

Step S102: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S103; If not, return to step S101;

Step S103: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S104; If not, enter step S105;

Step S104: auxiliary source electric capacity 20 does not charge, returns to step S101;

Step S105: 20 chargings of auxiliary source electric capacity, return to step S101.

In the embodiment of the present invention, to the auxiliary source circuit shown in Fig. 2:

The electric capacity of auxiliary source described in step S104 20 does not charge and can be specially: turn-off described cut-out switch 30; Or, further judge whether described chopping voltage control signal Vg is Continuity signal, if so, chopping switch 10 described in conducting, otherwise, turn-off described chopping switch 10 and turn-off described cut-out switch 30.

The electric capacity of auxiliary source described in step S105 20 charging can be specially: turn-off described in described chopping switch 10 and conducting and cut off switch 30.

Concrete difference as shown in Figure 4 and Figure 5.

With reference to Fig. 4, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two.Described method specifically comprises the following steps:

Step S201: start;

Step S202: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S203; If not, return to step S201;

Step S203: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S204; If not, enter step S205;

Step S204: turn-off described cut-out switch 30, return to step S201;

Step S205: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S201.

Described in the embodiment of the present invention two, in method, when described cut-out switch 30 conductings and 10 shutoff of described chopping switch, described auxiliary source electric capacity 20 is in parallel with described chopping switch 10, described auxiliary source electric capacity 20 chargings; When described cut-out switch 30 turn-offs, described auxiliary source electric capacity 20 stops charging.

With reference to Fig. 5, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention three.Described method specifically comprises the following steps:

Step S301: start;

Step S302: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S303; If not, return to step S301;

Step S303: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S304; If not, enter step S307;

Step S304: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S305; If not, enter step S306;

Step S305: described in conducting, chopping switch 10, returns to step S301;

Step S306: turn-off described chopping switch 10 and turn-off described cut-out switch 30, returning to step S301;

Step S307: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S301.

Described in the embodiment of the present invention three, described in method and embodiment bis-, the difference of method is: when definite described auxiliary source voltage is when preset lower limit and described chopping switch 10 are in chopping cycle, further judge that whether described chopping voltage control signal Vg is the signal of chopping switch 10 described in conducting, if so, chopping switch 10 described in conducting; Otherwise, turn-off described chopping switch 10 and turn-off described cut-out switch 30.

With reference to Fig. 6, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention four.Described method specifically comprises the following steps:

Step S401: start;

Step S402: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S403; If not, enter step S404;

Step S403: turn-off described cut-out switch 30, return to step S401;

Step S404: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S405; If not, return to step S401;

Step S405: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S406; If not, enter step S407;

Step S406: turn-off described cut-out switch 30, return to step S404;

Step S407: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S404.

Described in the embodiment of the present invention four, described in method and embodiment bis-, the difference of method is: when judging current auxiliary source voltage whether lower than preset lower limit, first judge that whether current auxiliary source voltage is higher than the higher limit of setting, if so, turn-off described cut-out switch 30; Otherwise, more further judge that whether current auxiliary source voltage is lower than preset lower limit.

Accordingly, with reference to Fig. 7, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention five.Described method specifically comprises the following steps:

Step S501: start;

Step S502: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S503; If not, enter step S504;

Step S503: turn-off described cut-out switch 30, return to step S501;

Step S504: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S505; If not, return to step S501;

Step S505: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S506; If not, enter step S509;

Step S506: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S507; If not, enter step S508;

Step S507: described in conducting, chopping switch 10, returns to step S504;

Step S508: turn-off described chopping switch 10 and turn-off described cut-out switch 30, returning to step S504;

Step S509: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S504.

Described in the embodiment of the present invention five, described in method and embodiment tri-, the difference of method is: when judging current auxiliary source voltage whether lower than preset lower limit, first judge that whether current auxiliary source voltage is higher than the higher limit of setting, if so, turn-off described cut-out switch 30; Otherwise, more further judge that whether current auxiliary source voltage is lower than preset lower limit.

With reference to Fig. 8, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention six.Described in embodiment six, the difference of method and embodiment tetra-is: when described auxiliary source voltage is during higher than capping value, can, by judgement chopping voltage control signal, control chopping switch 10 and cut off switch 30; That is, when two-wire dimmer need to be exported non-zero voltage, control chopping switch 10 conductings, and when two-wire dimmer need to be exported no-voltage, control chopping switch 10 to turn-off, cut off switch 30 and turn-off.

Described method specifically comprises the following steps:

Step S601: start;

Step S602: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S603; If not, enter step S606;

Step S603: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S604; If not, enter step S605;

Step S604: described in conducting, chopping switch 10, returns to step S602;

Step S605: turn-off described chopping switch 10, turn-off described cut-out switch 30, return to step S602;

Step S606: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S607; If not, return to step S602;

Step S607: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S608; If not, enter step S609;

Step S608: turn-off described cut-out switch 30, return to step S606;

Step S609: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S606.

Method described in the embodiment of the present invention six, when auxiliary source voltage is during higher than capping value, shows not need to continue as 20 chargings of auxiliary source electric capacity.And during chopping switch 10 conducting, its two ends pressure drop is zero, no matter described cut-out switch 30 is conducting or shutoff, can not cause the charging to auxiliary source electric capacity 20.Now, while only needing to guarantee that described chopping switch 10 turn-offs, described cut-out switch 30 turn-offs.Need to guarantee that the reason of cutting off switch 30 shutoffs is, when chopping switch 10 turn-offs, its both end voltage is line voltage, not destroyed in order to guarantee auxiliary source electric capacity 20 and other devices, need to, when chopping switch 10 turn-offs, stop to 20 chargings of auxiliary source electric capacity.Equally, in method, when described cut-out switch 30 turn-offs, also can reach the object that described auxiliary source electric capacity 20 is not charged described in embodiment six.

With reference to Fig. 9, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention seven.Described in embodiment seven, the difference of method and embodiment five is: when described auxiliary source voltage is during higher than capping value, can, by judgement chopping voltage control signal Vg, control chopping switch 10 and cut off switch 30; That is, when two-wire dimmer need to be exported non-zero voltage, control chopping switch 10 conductings, and when two-wire dimmer need to be exported no-voltage, control chopping switch 10 to turn-off, cut off switch 30 and turn-off.

Described method specifically comprises the following steps:

Step S701: start;

Step S702: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S703; If not, enter step S706;

Step S703: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S704; If not, enter step S705;

Step S704: described in conducting, chopping switch 10, returns to step S702;

Step S705: turn-off described chopping switch 10, turn-off described cut-out switch 30, return to step S702;

Step S706: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S707; If not, return to step S702;

Step S707: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S708; If not, enter step S911;

Step S708: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S709; If not, enter step S910;

Step S709: described in conducting, chopping switch 10, returns to step S706;

Step S710: turn-off described chopping switch 10 and turn-off described cut-out switch 30, returning to step S706;

Step S711: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S706.

Method described in the embodiment of the present invention seven, when the step described in the step of auxiliary source voltage during higher than capping value is similar to the embodiment six of Fig. 8.

In the present invention as described in embodiment mono-to seven method, detect auxiliary source voltage, if auxiliary source voltage lower than preset lower limit, and the chopping switch of two-wire dimmer is when non-chopping cycle, control described chopping switch 10 and turn-off, control described cut-out switch 30 conductings simultaneously.Now, in two-wire dimmer, auxiliary source electric capacity 20 forms loop with the output load of two-wire dimmer, and AC power is 20 chargings of auxiliary source electric capacity by this loop, auxiliary source voltage raises, and the output voltage of two-wire dimmer is the poor of input ac voltage and auxiliary source voltage.

When auxiliary source voltage, is controlled described cut-out switch 30 and turn-offed during in chopping cycle lower than preset lower limit and chopping switch 10.Now, in two-wire dimmer, AC power stops the charging to auxiliary source electric capacity 20, and auxiliary source electric capacity 20 releases energy to load; Two-wire dimmer output voltage is zero.Or, when auxiliary source voltage is lower than preset lower limit and chopping switch 10 during in chopping cycle, judge chopping voltage control signal Vg for whether conducting, if conducting, control described chopping switch 10 conductings, if turn-off, control described chopping switch 10 and turn-off, and control described cut-out switch 30 and also turn-off.

When auxiliary source voltage is during higher than capping value, control described cut-out switch 30 and turn-off.Or, when auxiliary source voltage is during higher than capping value, judge chopping voltage control signal Vg for whether conducting, if described chopping switch 10 conductings are controlled in conducting, if turn-off, control described chopping switch 10 and turn-off, and control described cut-out switch 30 and also turn-off.

Preferably, can Voltage stabilizing module or boost module be set at auxiliary source electric capacity 20 outputs.Described Voltage stabilizing module can comprise voltage-stabilizing device or the voltage stabilizing circuit consisting of voltage-stabilizing device or linear voltage-stabilizing circuit etc.; Described boost module can for boost converter circuit etc., for example, can be BOOST circuit.

It should be noted that, in actual applications, the magnitude of voltage when preset lower limit that auxiliary source voltage can be set can normally be worked higher than auxiliary source circuit.Can guarantee like this: when auxiliary source voltage is lower than preset lower limit, and chopping switch in two-wire dimmer is in the time period in chopping cycle, in auxiliary source electric capacity 20 can only discharge the time period that can not charge to auxiliary source load, still guarantee that the minimum of auxiliary source voltage can maintain the normal work of auxiliary source circuit.

In charging process, auxiliary source electric capacity 20 voltages equal chopping switch 10 both end voltage, therefore chopping switch 10 both end voltage can not surpass the higher limit that auxiliary source voltage is set, while being two-wire dimmer output non-zero voltage, its output voltage and alternating voltage differ and are no more than auxiliary source upper voltage limit value.For example, if AC-input voltage Vin is that line voltage is (as 110Vac, 220Vac, or 277Vac), and the higher limit of auxiliary source voltage vcc is controlled at several V conventionally to tens V, AC-input voltage Vin is much larger than chopping switch 10 both end voltage, so the output voltage of two-wire dimmer equals the voltage that AC-input voltage Vin deducts chopping switch 10 two ends, is non-zero voltage.

Meanwhile, in the embodiment of the present invention, because chopping switch 10 is operated on off state, and nonlinear state, therefore the auxiliary source circuit loss of described two-wire dimmer is very little, and efficiency is high.

The auxiliary source circuit of the embodiment of the present invention does not need the restriction of minimum copped wave angle, so electromagnetic interference is little.

With reference to Figure 10, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention eight.Described in embodiment eight, the difference of method and embodiment six is: before judging that described auxiliary source voltage is whether higher than capping value, first judge that whether described auxiliary source voltage is higher than the false voltage value of setting; If higher than the false voltage value of setting, directly turn-off described cut-out switch 30, more whether detect described auxiliary source voltage lower than false voltage value; If turn-offed after described cut-out switch 30 still higher than described false voltage value, export failure control signal and control and turn-off described cut-out switch 30, if turn-off after described cut-out switch 30 lower than described false voltage value, do not export failure control signal and enter normal mode of operation.When judge described auxiliary source voltage whether higher than set false voltage value time its when the determination result is NO, enter normal mode of operation, judge that whether described auxiliary source voltage is higher than capping value.

Concrete, method can comprise the following steps described in embodiment eight:

Step S801: start;

Step S802: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than the false voltage value of setting, if so, enters step S803; If not, enter step S805;

Step S803: output failure control signal, turn-offs described cut-out switch 30;

Step S804: judge that described auxiliary source voltage, whether lower than the false voltage value of setting, if so, enters step S805; If not, return to step S803;

Step S805: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S806; If not, enter step S809;

Step S806: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S807; If not, enter step S808;

Step S807: described in conducting, chopping switch 10, returns to step S805;

Step S808: turn-off described chopping switch 10, turn-off described cut-out switch 30, return to step S805;

Step S809: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S810; If not, return to step S802;

Step S810: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S811; If not, enter step S812;

Step S811: turn-off described cut-out switch 30, return to step S809;

Step S812: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S809.

Method described in the embodiment of the present invention eight; before entering normal mode of operation; first judge that whether described auxiliary source voltage is higher than the false voltage value of setting; if higher than the false voltage value of setting; export failure control signal; only auxiliary source voltage lower than set false voltage value time, then start normal work, realized thus the protection to auxiliary source circuit.

Corresponding, with reference to Figure 11, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention nine.Described in embodiment nine, the difference of method and embodiment seven is: before judging that described auxiliary source voltage is whether higher than capping value, first judge that whether described auxiliary source voltage is higher than the false voltage value of setting.

Concrete, method can comprise the following steps described in embodiment nine:

Step S901: start;

Step S902: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than the false voltage value of setting, if so, enters step S903; If not, enter step S905;

Step S903: output failure control signal, turn-offs described cut-out switch 30;

Step S904: judge that described auxiliary source voltage, whether lower than the false voltage value of setting, if so, enters step S905; If not, return to step S903;

Step S905: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S906; If not, enter step S909;

Step S906: judge that whether described chopping voltage control signal is chopping switch 10 described in conducting, if so, enters step S907; If not, enter step S908;

Step S907: described in conducting, chopping switch 10, returns to step S905;

Step S908: turn-off described chopping switch 10, turn-off described cut-out switch 30, return to step S905;

Step S909: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S910; If not, return to step S902;

Step S910: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S911; If not, enter step S912;

Step S911: judge that whether described chopping voltage control signal Vg is chopping switch 10 described in conducting, if so, enters step S912; If not, enter step S914;

Step S912: described in conducting, chopping switch 10, returns to step S909;

Step S913: turn-off described chopping switch 10 and turn-off described cut-out switch 30, returning to step S909;

Step S914: turn-off described in described chopping switch 10 and conducting and cut off switch 30, return to step S909.

Method described in the embodiment of the present invention nine; before entering normal mode of operation; first judge that whether described auxiliary source voltage is higher than the false voltage value of setting; if higher than the false voltage value of setting; export failure control signal; only auxiliary source voltage lower than set false voltage value time, then start normal work, realized thus the protection to auxiliary source circuit.

The embodiment of Figure 10 (being embodiment eight), and the embodiment of Figure 11 (being embodiment nine), for having added error protection on the embodiment basis at Fig. 8 (being embodiment six) and Fig. 9 (being embodiment seven).Also: before entering normal mode of operation, first judge that whether described auxiliary source voltage is higher than the false voltage value of setting.

If higher than the false voltage value of setting; export failure control signal, this fault-signal is controlled auxiliary source electric capacity 20 and is not charged, only auxiliary source voltage lower than set false voltage value time; start again normal work, realized thus the protection to auxiliary source circuit.

Simultaneously; the process embodiment of this error protection is not only applicable to the embodiment of Fig. 8 and Fig. 9; equally also be applicable to the embodiment of Fig. 6 (being embodiment tetra-) and Fig. 7 (being embodiment five); with the embodiment of Figure 10 and Figure 11 be similarly; before judging that described auxiliary source voltage is whether higher than capping value; first judge that described auxiliary source voltage, whether higher than the false voltage value of setting, does not repeat them here.

A kind of conditioning signal that chopping voltage sends as two-wire dimmer, to the light source drive of rear class, is distinguished different conditioning signals by the difference at copped wave phase angle, and the light source drive of rear class responds this variation, can realize the adjusting to light source.

The applicable chopping voltage send mode of the present invention is: chopping cycle and non-chopping cycle be appearance alternately, and in chopping cycle, dimmer sends chopping voltage to the light source drive of rear class, to transmit conditioning signal.

With reference to Figure 12, it is the two-wire dimmer output voltage V o oscillogram of the embodiment of the present invention.As shown in figure 12, chopping switch, under the control of chopping voltage control signal Vg, makes dimmer output voltage V o comprise two states, and state one is non-chopping cycle, and state two is chopping cycle.

Chopping cycle detection signal Vb, also comprises two states.When Vo is during in chopping cycle, chopping cycle detection signal Vb is state one, after control device 40 receives Vb and is state one, controls auxiliary source electric capacity and does not charge; When Vo is during in non-chopping cycle, chopping cycle detection signal Vb is state two, after control device 40 receives Vb and is state two, controls auxiliary source electric capacity and charges when lower than lower limit.

Shown in Fig. 2, the auxiliary source circuit structure chart of the two-wire dimmer of the embodiment of the present invention one, described auxiliary source electric capacity 20 forms series arm with described cut-out switch 30; Described chopping switch 10 is in parallel with described series arm.

Described control device 40, for detection of auxiliary source voltage, is used for controlling the first signal V1 of described chopping switch 10 break-makes and the secondary signal V2 of described cut-out switch 30 break-makes of control according to described auxiliary source Voltage-output.

Concrete, when described chopping voltage control signal Vg is while turn-offing chopping switch 10, described control circuit 40 output first signal V1 control chopping switch 10 and turn-off, and output secondary signal V2 control is cut off switch 30 and turn-offed, and makes described two-wire dimmer output no-voltage.

In the embodiment of the present invention, described chopping voltage control signal Vg and chopping cycle detection signal Vb can be provided by control circuit of chopping (not shown).

When described auxiliary source voltage is lower than preset lower limit, and described chopping switch 10 is when non-chopping cycle, controls described auxiliary source electric capacity 20 and charges in non-chopping cycle.

Below the specific implementation form of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention one is described in detail.

With reference to Figure 13, the first implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 13, in circuit, described chopping switch 10 is comprised of rectifier bridge and single-way switch.

As shown in figure 13, described auxiliary source electric capacity 20 is C1, and described cut-out switch 30 is Q2; Described auxiliary source capacitor C 1 is connected with described cut-out switch Q2, forms a series arm; Described series arm is in parallel with the rectification bridge output end of described chopping switch 10, and the rectifier bridge input of chopping switch 10 is connected between one end and output load one end of input voltage vin, and the other end of output load connects the other end of input voltage vin.

Described series arm is specially: the minus earth of described auxiliary source capacitor C 1, the positive pole of described auxiliary source capacitor C 1 connects one end of described cut-out switch Q2.

Particularly, series arm one end, i.e. the other end of described cut-out switch Q2, connects the rectifier bridge output plus terminal of described chopping switch 10; The other end of series arm, the negative pole of auxiliary source capacitor C 1 connects the rectifier bridge output negative terminal of described chopping switch 10.

Described chopping switch 10 is the bidirectional switch that a switching tube Q1 and a rectifier bridge form; Wherein, described rectifier bridge is comprised of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4.

When described switching tube Q1 is metal-oxide-semiconductor, its source electrode connects the common port on described series arm and ground, and drain electrode connects the other end of described series arm.

Described the first diode D1 and the second diode D2 series connection, the negative electrode of described the first diode D1 connects the anode of described the second diode D2.Described the 3rd diode D3 connects with the 4th diode D4, and the negative electrode of described the 3rd diode D3 connects the anode of described the 4th diode D4.

The anode of the anode of described the first diode D1 and described the 3rd diode D3 together connects the source electrode of described switching tube Q1; The negative electrode of the negative electrode of described the second diode D2 and described the 4th diode D4 together connects the drain electrode of described switching tube Q1.

The common port of described the first diode D1 and the second diode D2 is as one end of a termination input voltage vin of described two-wire dimmer; The common port of described the 3rd diode D3 and the 4th diode D4 is connected one end of output load as the other end of described two-wire dimmer, two-wire dimmer output voltage is Vo; After two-wire dimmer and output load series connection, be connected in parallel on input voltage vin two ends.

The grid of described switching tube Q1 meets first signal V1; The control termination secondary signal V2 of described cut-out switch Q2.

In described auxiliary source capacitor C 1, voltage is auxiliary source voltage vcc.

It should be noted that, the switching tube Q1 that forms chopping switch 10 shown in Figure 13 only be take metal-oxide-semiconductor and is described as example.In actual applications, any unidirectional switching tube can form as diagram switching tube Q1 the chopping switch of the embodiment of the present invention.

Shown in Figure 13 in circuit, when control switch pipe Q1 turn-offs, cuts off switch Q2 conducting, this two-wire dimmer obtains auxiliary source voltage, i.e. auxiliary source capacitor charging, is that the voltage Vo at load two ends is the poor of input voltage vin and auxiliary source voltage vcc at the output voltage of dimmer; When control switch pipe Q1 conducting, cut-out switch Q2 turn-off, described auxiliary source capacitor C 1 is to the electric discharge of auxiliary source load (not shown), and the output voltage V o of dimmer equals input voltage vin; When control switch pipe Q1 turn-offs, cuts off switch Q2 shutoff, described auxiliary source capacitor C 1 electric discharge, the output voltage V o of dimmer is zero.

To auxiliary source circuit shown in Figure 13, if within the half period of alternating voltage Vin, make described two-wire dimmer alternately be output as no-voltage and non-zero voltage, the output voltage of described two-wire dimmer is chopping voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 13 is the rear control signal along dimmer, in chopping cycle, the waveform of output voltage V o is as shown in figure 14.

In Figure 14, the input voltage vin that dotted line is described two-wire dimmer, is sinusoidal ac; When being embodied as described auxiliary source electric capacity and not charging, the output voltage V o of described two-wire dimmer is chopping voltage in chopping cycle.

With reference to Figure 15, the second implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 15, in circuit, described chopping switch 10 is comprised of single-way switch.Compare with circuit shown in Figure 13, shown in Figure 15, circuit also comprises: the rectifying device D5 connecting with described auxiliary source capacitor C 1 and cut-out switch Q2.

As shown in figure 15, described auxiliary source electric capacity 20 is C1, and described cut-out switch 30 is Q2; Described auxiliary source capacitor C 1, described cut-out switch Q2 and rectifying device D5 series connection, form a series arm; Described series arm and described chopping switch 10 and be connected in input voltage vin and output load between.

Described series arm is specially: the negative pole of described auxiliary source capacitor C 1 connects one end of output load, and the positive pole of described auxiliary source capacitor C 1 connects one end of described cut-out switch Q2; The negative electrode of rectifying device D5 described in another termination of described cut-out switch Q2, the anode of described rectifying device D5 connects one end of described input voltage vin.

Described chopping switch 10 comprises: metal-oxide-semiconductor Q1; The source electrode of described metal-oxide-semiconductor Q1 connects one end of output load, and the drain electrode of described metal-oxide-semiconductor Q1 connects one end that described series arm connects input voltage vin.After two-wire dimmer and load series connection, be connected in parallel on input voltage vin two ends.

The grid of described metal-oxide-semiconductor Q1 meets first signal V1; The control termination secondary signal V2 of described cut-out switch Q2.In described auxiliary source capacitor C 1, voltage is auxiliary source voltage vcc.

Circuit shown in Figure 15 is similar to the operation principle of the circuit shown in Figure 13, does not repeat them here.Different from circuit shown in Figure 13, circuit shown in Figure 15, when two-wire dimmer sends chopping voltage, is exported chopping voltage in the half period; In another half period, the body diode conducting of described metal-oxide-semiconductor Q1.Be, the chopping voltage of described two-wire dimmer output, in an ac cycle, is chopping voltage in one of them half period, in another half period, is AC-input voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 15 is the rear control signal along dimmer, in chopping cycle, the output voltage waveforms of circuit shown in Figure 15 is as shown in figure 16.

It should be noted that, shown in Figure 15, form chopping switch 10 and only take metal-oxide-semiconductor and describe as example.In actual applications, can adopt the mode of single-way switch pipe reverse parallel connection diode to substitute the chopping switch that the switching tube Q1 shown in Figure 15 forms the embodiment of the present invention.For example, the chopping switch shown in Figure 17 10.

With reference to Figure 17, the third implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 17, in circuit, described chopping switch 10 is comprised of single-way switch.Compare with circuit shown in Figure 15, shown in Figure 17, in circuit, by switching tube Q1 reverse parallel connection diode D6, substitute the Q1 in Figure 15.

As shown in figure 17, described auxiliary source electric capacity 20 is C1, and described cut-out switch 30 is Q2; Described auxiliary source capacitor C 1, described cut-out switch Q2 and rectifying device D5 series connection, form a series arm; Described series arm and described chopping switch 10 and be connected in input voltage vin and output load between.

Described chopping switch 10 comprises: switching tube Q1 and the 6th diode D6; The emitter of described switching tube Q1 connects one end of output load, and the collector electrode of described switching tube Q1 connects one end that described series arm connects input voltage vin.

The negative electrode of described the 6th diode D6 connects the collector electrode of described switching tube Q1, and the anode of described the 6th diode D6 connects the emitter of described switching tube Q1.

The grid of described switching tube Q1 meets the first control signal V1; Control termination the second control signal V2 of described cut-out switch Q2.

Circuit shown in Figure 17 is similar to the operation principle of the circuit shown in Figure 15, does not repeat them here.

With reference to Figure 18, the 4th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 18, in circuit, described chopping switch 10 is two metal-oxide-semiconductors.

As shown in figure 18, described auxiliary source electric capacity 20 is C1, and described cut-out switch 30 is Q2; Described auxiliary source capacitor C 1, described cut-out switch Q2, connect with two diodes respectively, form two series arms; Each paralleled power switches in described each series arm and described chopping switch 10.

Described the first series arm is specially: the minus earth of described auxiliary source capacitor C 1, and the positive pole of described auxiliary source capacitor C 1 connects one end of described cut-out switch Q2; The negative electrode of another termination the 7th diode D7 of described cut-out switch Q2.

Described the second series arm is specially: the minus earth of described auxiliary source capacitor C 1, and the positive pole of described auxiliary source capacitor C 1 connects one end of described cut-out switch Q2; The negative electrode of another termination the 8th diode D8 of described cut-out switch Q2.

Described chopping switch 10 comprises: the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4.The source electrode of the source electrode of described the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4 is ground connection together.

Described the first series arm is in parallel with the 3rd metal-oxide-semiconductor Q3 of chopping switch 10, and described the second series arm is in parallel with the 4th metal-oxide-semiconductor Q4 of chopping switch 10.

Particularly, one end of the first series arm (i.e. the anode of the 7th diode D7) connects the drain electrode of the 3rd metal-oxide-semiconductor Q3, and the other end of the first series arm (being the negative pole of auxiliary source capacitor C 1) connects the source electrode of the 3rd metal-oxide-semiconductor Q3; One end of the second series arm (i.e. the anode of the 8th diode D8) connects the drain electrode of the 4th metal-oxide-semiconductor Q4, and the other end of the second series arm (being the negative pole of auxiliary source capacitor C 1) connects the source electrode of the 4th metal-oxide-semiconductor Q4.

The drain electrode of described the 3rd metal-oxide-semiconductor Q3 connects one end of input voltage vin; The drain electrode of described the 4th metal-oxide-semiconductor Q4 connects one end of output load, the other end of another termination input voltage vin of output load.

The grid of the grid of described the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4 meets the first control signal V1; Control termination the second control signal V2 of described cut-out switch Q2.

Shown in Figure 18 in circuit, when alternating voltage Vin is positive half period, controlling the 3rd metal-oxide-semiconductor Q3 turn-offs, and control while cutting off switch Q2 conducting, this two-wire dimmer obtains auxiliary source voltage, being auxiliary source capacitor C 1 charging, the output voltage of dimmer, is that the voltage Vo at load two ends is the poor of input voltage vin and auxiliary source voltage vcc; When alternating voltage Vin is negative half-cycle, controlling the 4th metal-oxide-semiconductor Q4 turn-offs, and control while cutting off switch Q2 conducting, this two-wire dimmer obtains auxiliary source voltage, being auxiliary source capacitor C 1 charging, the output voltage of dimmer, is that the voltage Vo at load two ends is the poor of input voltage vin and auxiliary source voltage vcc.

When controlling the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4 conducting, and control while cutting off switch Q2 shutoff, described auxiliary source capacitor C 1 is to the electric discharge of auxiliary source load (not shown), and the output voltage V o of dimmer equals input voltage vin; When controlling the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4 shutoff, cut-out switch Q2 shutoff, described auxiliary source capacitor C 1 is to auxiliary source load discharge, and the output voltage V o of dimmer is zero.

Preferably, in the embodiment of the present invention, described chopping switch can be for one or more; Each chopping switch can be single-way switch or bidirectional switch.

Preferably, the described series arm in parallel with chopping switch can be for one or more.

The embodiment of the present invention also provides a kind of auxiliary source circuit of two-wire dimmer.The difference of the circuit providing with previous embodiment is, this circuit comprises: chopping switch, auxiliary source electric capacity, cut off switch, rectifying device.Described rectifying device and described auxiliary source capacitances in series, form a series arm; Described cut-out switch is in parallel with described series arm, forms a parallel branch; Described chopping switch is connected with described parallel branch again.Concrete, can be as shown in figure 19.

With reference to Figure 19, it is the structure chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two.The accessory power supply of described two-wire dimmer can comprise: chopping switch 100, auxiliary source electric capacity 200, cut-out switch 300, rectifying device 400, control device 500.

Described rectifying device 400 is connected with described auxiliary source electric capacity 200, forms a series arm; Described cut-out switch 300 is in parallel with described series arm, forms a parallel branch; Described chopping switch 100 is connected with described parallel branch again.

When described cut-out switch 300 turn-offs, described auxiliary source electric capacity 200 is connected with described chopping switch 100, and auxiliary source electric capacity 200 is by described rectifying device 400 chargings; When 300 conducting of described cut-out switch, described auxiliary source electric capacity 200 stops charging.

Described chopping switch 100, cut-out switch 300 are connected in parallel on input power Vin two ends simultaneously and after output load series connection.

The input signal of described control device 500 is Vg and Vb, output first signal V1 and secondary signal V2.Wherein, the chopping voltage control signal that input signal Vg is dimmer, input signal Vb is chopping cycle detection signal.Described chopping cycle detection signal Vb and chopping voltage control signal Vg are that control circuit of chopping (not shown this circuit) produces.

Wherein: described chopping voltage control signal Vg exports the signal of chopping voltage in chopping cycle for controlling described two-wire dimmer.

Chopping cycle detection signal Vb is for detecting the signal of control circuit of chopping output chopping cycle, comprise two states, state one and state two, when control circuit of chopping is controlled dimmer output voltage in chopping cycle, chopping cycle detection signal Vb is state one, when control circuit of chopping is controlled dimmer output voltage in non-chopping cycle, chopping cycle detection signal Vb is state two.

Wherein, described chopping cycle refers to: in the half period of input ac power, no-voltage and non-zero voltage alternately appear in dimmer output voltage; Described non-chopping cycle refers to: the cycle that there is no lasting no-voltage in dimmer output voltage.

Described control device 500 is for detection of auxiliary source voltage, according to described auxiliary source voltage vcc and input signal Vg and chopping cycle detection signal Vb, output first signal V1 and secondary signal V2 control respectively described chopping switch 100 and cut off conducting or the shutoff of switch 300.

In the situation that auxiliary source electric capacity does not charge, when described chopping voltage control signal Vg output makes the signal of chopping switch 100 shutoffs, control device 500 output first signal V1 control chopping switch 100 and turn-off, output secondary signal V2 controls and cuts off switch 300 conductings, and described two-wire dimmer is output as no-voltage; When chopping voltage control signal Vg output does not make the signal of chopping switch 100 shutoffs, control device 500 output first signal V1 control chopping switch 100 conductings, at the voltage vcc of auxiliary source electric capacity 200 lower than lower limit, auxiliary source electric capacity 200 needs under charge condition, control device 500 output secondary signal V2 control and cut off switch 300 shutoffs, auxiliary source electric capacity 200 is connected in parallel on and is cut off switch 300 two ends by rectifying device, conventionally the voltage vcc of auxiliary source electric capacity 200 is very low, only has several V left and right, two-wire dimmer output non-zero voltage; At the voltage vcc of auxiliary source electric capacity 200, higher than higher limit, auxiliary source electric capacity 200 does not need under charge condition, and control device 500 output secondary signal V2 control and cut off switch 300 conductings, two-wire dimmer output non-zero voltage.

Corresponding to the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two, the embodiment of the present invention provides a kind of accessory power supply control method of two-wire dimmer.

With reference to Figure 20, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention ten.Described method specifically comprises the following steps:

Step S1001: start;

Step S1002: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S1003; If not, return to step S1002;

Step S1003: judge that described chopping switch 100 whether in chopping cycle, if so, enters step S1004; If not, enter step S1005;

Step S1004: auxiliary source electric capacity 200 does not charge, returns to step S1001;

Step S1005: 200 chargings of auxiliary source electric capacity, return to step S1001.

In the embodiment of the present invention, to the auxiliary source circuit shown in Figure 19: the electric capacity of auxiliary source described in step S1004 20 does not charge and can be specially: cut off switch 300 described in conducting; 20 chargings of the electric capacity of auxiliary source described in step S1005 can be specially: turn-off described cut-out switch 300.

Specifically can be as shown in figure 21.

With reference to Figure 21, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 11.Described method specifically comprises the following steps:

Step S1101: start;

Step S1102: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S1103; If not, return to step S1101;

Step S1103: judge that described chopping switch 10 whether in chopping cycle, if so, enters step S1104; If not, enter step S1105;

Step S1104: cut off switch 300 described in conducting, return to step S1101;

Step S1105: turn-off described cut-out switch 300, return to step S1101.

Method described in the embodiment of the present invention 11, when described cut-out switch 300 turn-offs, described auxiliary source electric capacity 200 is connected with described chopping switch 100, and auxiliary source electric capacity 200 is by described rectifying device 400 chargings; When 300 conducting of described cut-out switch, described auxiliary source electric capacity 200 stops charging.

With reference to Figure 22, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 12.Described method specifically comprises the following steps:

Step S1201: start;

Step S1202: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S1203; If not, enter step S1204;

Step S1203: cut off switch 30 described in conducting, return to step S1201;

Step S1204: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S1205; If not, return to step S1201;

Step S1205: judge that described chopping switch 100 whether in chopping cycle, if so, enters step S1206; If not, enter step S1207;

Step S1206: cut off switch 300 described in conducting, return to step S1204;

Step S1207: turn-off described cut-out switch 300, return to step S1204.

Method described in the embodiment of the present invention 12, detects auxiliary source voltage, when auxiliary source voltage, is controlled described cut-out switch 300 and turn-offed during in non-chopping cycle lower than preset lower limit and described chopping switch 100.Now, in two-wire dimmer, described auxiliary source electric capacity 200 and 300 parallel connections of cut-out switch, form a parallel branch, and this parallel branch is connected with described chopping switch 100 again, and forms loop with the output load of two-wire dimmer.Now, AC power is 200 chargings of auxiliary source electric capacity by this loop, and auxiliary source voltage is raise, and the output voltage of two-wire dimmer is the poor of input ac voltage and auxiliary source voltage.

If auxiliary source voltage when the chopping cycle, is controlled described cut-out switch 300 conductings lower than preset lower limit and described chopping switch 100.Now, the conducting short circuit of described cut-out switch 300 series arm that forms of auxiliary source electric capacity 200 and rectifying device, described auxiliary source electric capacity 200 releases energy to auxiliary source load (not shown).The output voltage V o of two-wire dimmer is zero.

When auxiliary source voltage is during higher than capping value, control described cut-out switch 300 conductings.Now, if described chopping switch 100 replaces break-make within the half period of AC power, two-wire dimmer is exported chopping voltage; If described chopping switch 100 is in AC power conducting all the time in the cycle, the output voltage of two-wire dimmer is the alternating voltage of input.

Preferably, described chopping switch can be for one or more; Each chopping switch can be single-way switch or bidirectional switch.

Preferably, Voltage stabilizing module or boost module can be set at the output of described auxiliary source electric capacity.Described Voltage stabilizing module can comprise voltage-stabilizing device or the voltage stabilizing circuit consisting of voltage-stabilizing device or linear voltage-stabilizing circuit etc.; Described boost module can for boost converter circuit etc., for example, can be BOOST circuit.

It should be noted that, in actual applications, the magnitude of voltage when preset lower limit that described auxiliary source voltage can be set can normally be worked higher than auxiliary source circuit.Can guarantee like this: when auxiliary source voltage lower than described preset lower limit in the time period in two-wire dimmer chopping cycle, in auxiliary source electric capacity can only discharge the time period that can not charge to auxiliary source load, still guarantee that the minimum of auxiliary source voltage can maintain the normal work of auxiliary source circuit.

Due in charging process, the voltage of auxiliary source electric capacity equals to cut off switch ends voltage, therefore cut off switch ends voltage and can not surpass the capping value of auxiliary source voltage, while being two-wire dimmer output non-zero voltage, the difference of its output voltage and input ac voltage is no more than the capping value of auxiliary source voltage.

Meanwhile, because chopping switch is operated on off state, and nonlinear state, so the auxiliary source circuit loss of the embodiment of the present invention is very little, efficiency is high.

With reference to Figure 23, it is the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention 13.Described in embodiment 13, the difference of method and embodiment 12 is: before judging that described auxiliary source voltage is whether higher than capping value, first judge that whether described auxiliary source voltage is higher than the false voltage value of setting.

Concrete, method can comprise the following steps described in embodiment 13:

Step S1301: start;

Step S1302: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than the false voltage value of setting, if so, enters step S1303; If not, enter step S1305;

Step S1303: output failure control signal, cuts off switch 300 described in conducting;

Step S1304: judge that described auxiliary source voltage, whether lower than the false voltage value of setting, if so, enters step S1305; If not, return to step S1303;

Step S1305: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether higher than capping value, if so, enters step S1306; If not, enter step S1307;

Step S1306: cut off switch 300 described in conducting, return to step S1305;

Step S1307: detect current auxiliary source voltage, judge that described auxiliary source voltage, whether lower than preset lower limit, if so, enters step S1308; If not, return to step S1302;

Step S1308: judge that described chopping switch 100 whether in chopping cycle, if so, enters step S1309; If not, enter step S1310;

Step S1309: cut off switch 300 described in conducting, return to step S1307;

Step S1310: turn-off described cut-out switch 300, return to step S1307.

Method described in the embodiment of the present invention 13, when detect auxiliary source voltage higher than set false voltage value time, cut off switch 300 described in conducting, and then whether detect described auxiliary source voltage lower than the false voltage value of setting; If cut off after switch 300 conductings, described auxiliary source voltage, lower than the false voltage value of setting, is not exported failure control signal and is directly entered normal mode of operation; If cut off after switch 300 conductings, described auxiliary source voltage, still higher than the false voltage value of setting, continues output failure control signal and controls described cut-out switch conduction.Can realize thus, in the situation that abnormal or fault appear in auxiliary source circuit, auxiliary source circuit be protected.

The present embodiment is compared to embodiment 12 (being the embodiment shown in Figure 22), for having added on the basis at embodiment 12: before entering normal mode of operation, first judge that described auxiliary source voltage is whether higher than the step of the false voltage value of setting.If higher than the false voltage value of setting, export failure control signal, this fault-signal is controlled auxiliary source electric capacity and is not charged, only auxiliary source voltage lower than set false voltage value time, then start normal work, realized thus the protection to auxiliary source circuit.

Shown in Figure 19, the auxiliary source circuit structure chart of the two-wire dimmer of the embodiment of the present invention two, described rectifying device 400 is connected with described auxiliary source electric capacity 200, forms a series arm; Described cut-out switch 300 is in parallel with described series arm, forms a parallel branch; Described chopping switch 100 is connected with described parallel branch again.

In the present invention as described in embodiment ten to 13 method, when described cut-out switch 300 turn-offs, described auxiliary source electric capacity 200 connect with described chopping switch 100, auxiliary source electric capacity 200 passes through described rectifying device 400 and charges; When 300 conducting of described cut-out switch, described auxiliary source electric capacity 200 stops charging.

When described chopping switch 100 turn-offs, no matter whether auxiliary source electric capacity charges, and described two-wire dimmer output voltage V o is no-voltage; When described chopping switch 100 conducting, no matter whether auxiliary source electric capacity charges, and described two-wire dimmer output voltage V o is non-zero voltage.This be due to, when first signal V1 controls chopping switch 100 conducting, and secondary signal V2 controls described cut-out switch 300 also during conducting, described AC-input voltage Vin forms loop by chopping switch 100, cut-out switch 300 and output load, output load voltage, being that dimmer output voltage V o equals input ac voltage Vin, is non-zero voltage; When first signal V1 controls chopping switch 100 conducting, and when secondary signal V2 controls described cut-out switch 300 shutoff, described AC-input voltage Vin forms loop by chopping switch 100, auxiliary source electric capacity 200, rectifying device 400 and output load, output load voltage, be that dimmer output voltage V o equals the poor of input ac voltage Vin and auxiliary source voltage vcc, conventionally the voltage vcc of auxiliary source electric capacity 200 is very low, only has several volts left and right, therefore, dimmer output voltage V o is also non-zero voltage.

Described control device 500, for detection of auxiliary source voltage vcc, according to described auxiliary source voltage and chopping cycle detection signal Vb, output is for controlling the first signal V1 of described chopping switch 100 break-makes and the secondary signal V2 of described cut-out switch 300 break-makes of control.

Particularly, detect auxiliary source voltage, if auxiliary source voltage lower than preset lower limit, and the chopping switch of two-wire dimmer is when non-chopping cycle, described control device 500 is according to chopping cycle detection signal Vb, and output secondary signal V2 controls described cut-out switch 300 and turn-offs.Now, in two-wire dimmer, auxiliary source electric capacity 200 series connection chopping switch 100, and form loop with the output load of two-wire dimmer, AC power is 200 chargings of auxiliary source electric capacity by this loop, auxiliary source voltage vcc raises, and the output voltage of two-wire dimmer is the poor of input ac voltage and auxiliary source voltage.

When auxiliary source voltage is lower than preset lower limit and chopping switch during in chopping cycle, described control device 500 is according to chopping cycle detection signal Vb, and secondary signal V2 controls described cut-out switch 300 conductings.Now, in two-wire dimmer, AC power stops the charging to auxiliary source electric capacity 200, and auxiliary source electric capacity 200 releases energy to auxiliary source load.

When auxiliary source voltage is during higher than capping value, described control device 500 is according to chopping cycle detection signal Vb, and secondary signal V2 controls described cut-out switch 300 conductings.

At the chopping switch of two-wire dimmer during in chopping cycle, described control device 500 is according to described chopping voltage control signal Vg, and output first signal V1 controls the break-make of described chopping switch 100, and making dimmer output voltage V o is chopping voltage.

Below the specific implementation form of the auxiliary source circuit of the two-wire dimmer of the embodiment of the present invention two is described in detail.

With reference to Figure 24, be the 5th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 24, in circuit, described chopping switch 100 is comprised of rectifier bridge and single-way switch.

As shown in figure 24, described auxiliary source electric capacity 200 is C1, and described cut-out switch 300 is Q2, and described rectifying device is D11; Described auxiliary source capacitor C 1 is connected with rectifying device D11, forms a series arm, and this series arm is in parallel with described cut-out switch Q2 again, forms a parallel branch; Described chopping switch 100 is connected with this parallel branch.

Described parallel branch is specially: the negative pole of described auxiliary source capacitor C 1 connect common reference end (), the positive pole of described auxiliary source capacitor C 1 connects the negative electrode of described rectifying device D11; The two ends of described cut-out switch Q2 connect respectively the negative pole of described auxiliary source capacitor C 1 and the anode of described rectifying device D11.

Described chopping switch 100 is the bidirectional switch that a switching tube Q5 and a rectifier bridge form; Wherein, described rectifier bridge is comprised of the 12 diode D12, the 13 diode D13, the 14 diode D14, the 15 diode D15.

Described the 12 diode D12 and the 13 diode D13 series connection, the negative electrode of described the 12 diode D12 connects the anode of described the 13 diode D13.

Described the 14 diode D14 and the 15 diode D15 series connection, the negative electrode of described the 14 diode D14 connects the anode of the 15 diode D15.

Described the 12 anode of diode D12 and the anode of the 14 diode D14 together connect the source electrode of described switching tube Q5; Described the 13 negative electrode of diode D13 and the negative electrode of described the 15 diode D15 together connect the anode and the common port that cuts off switch Q2 of described rectifying device D11.

Switching tube Q5 be take metal-oxide-semiconductor as example, and the drain electrode of described switching tube Q5 connects the common port of the negative pole of described cut-out switch Q2 and described auxiliary source capacitor C 1.

The common port of described the 12 diode D12 and the 13 diode D13 is as a termination input voltage vin of described two-wire dimmer; The common port of described the 14 diode D14 and the 15 diode D15 is as another termination output load of described two-wire dimmer, and two-wire dimmer output voltage is Vo.

After two-wire dimmer and load series connection, be connected in parallel on input Vin two ends.

The grid of described switching tube Q5 meets first signal V1; The control termination secondary signal V2 of described cut-out switch Q2.

It should be noted that, the switching tube Q5 that forms chopping switch 100 shown in Figure 24 only be take metal-oxide-semiconductor and is described as example.In actual applications, any unidirectional switching tube can form as diagram switching tube Q1 the chopping switch of the embodiment of the present invention.

Shown in Figure 24, in circuit, when control switch pipe Q5 conducting, cut-out switch Q2 turn-off, this two-wire dimmer obtains auxiliary source voltage, and output voltage V o is the poor of input voltage vin and auxiliary source voltage vcc; When control switch pipe Q5 conducting, cut-out switch Q2 conducting, described auxiliary source capacitor C 1 electric discharge, its output voltage equals input voltage vin; When control switch pipe Q5 turn-offs, cuts off switch Q2 conducting, described auxiliary source capacitor C 1 is to the electric discharge of auxiliary source load (not shown), and its output voltage is zero.

To auxiliary source circuit shown in Figure 24, if within the half period of alternating voltage Vin, make two-wire dimmer alternately be output as no-voltage and non-zero voltage, the output voltage of described two-wire dimmer is chopping voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 24 is rear during along dimmer control signal, in chopping cycle, the waveform of output voltage V o can be as shown in figure 25.

With reference to Figure 26, be the 6th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 26, in circuit, described chopping switch 100 is comprised of single-way switch.

As shown in figure 26, described auxiliary source electric capacity 200 is C1, and described cut-out switch 300 is Q2, and described rectifying device is D11; Described auxiliary source capacitor C 1 is connected with rectifying device D11, forms a series arm, and this series arm is in parallel with described cut-out switch Q2 again, forms a parallel branch; Described chopping switch 100 is connected with this parallel branch.

Described parallel branch is specially: the negative pole of described auxiliary source capacitor C 1 connects output load one end, and the positive pole of described auxiliary source capacitor C 1 connects the negative electrode of described rectifying device D11; The two ends of described cut-out switch Q2 connect respectively the negative pole of described auxiliary source capacitor C 1 and the anode of described rectifying device D11.

Described chopping switch 100 comprises: switching tube Q5; The source electrode of described switching tube Q5 connects the common port of the anode of described cut-out switch Q2 and described rectifying device D11; The drain electrode of described switching tube Q5 connects one end of described input voltage vin.

The other end of input voltage vin is connected with the other end of output load.

Circuit shown in Figure 26 is similar to the operation principle of the circuit shown in Figure 24, does not repeat them here.Different from circuit shown in Figure 24, circuit shown in Figure 26, when two-wire dimmer sends chopping voltage, is exported chopping voltage in the half period; In another half period, the body diode conducting of described switching tube Q5.Be, the chopping voltage of described two-wire dimmer output, in an ac cycle, is chopping voltage in one of them half period, in another half period, is AC-input voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 26 is rear during along dimmer control signal, in chopping cycle, output voltage V o waveform as shown in figure 27.

It should be noted that, the switching tube Q5 that forms chopping switch 100 shown in Figure 26 only be take metal-oxide-semiconductor and is described as example.In actual applications, can adopt the mode of single-way switch pipe reverse parallel connection diode to substitute the chopping switch that the switching tube Q5 shown in Figure 26 forms the embodiment of the present invention.For example, the chopping switch shown in Figure 28 100.

With reference to Figure 28, be the 7th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 28, in circuit, described chopping switch 100 is comprised of single-way switch.Compare with circuit shown in Figure 26, shown in Figure 28, in circuit, by switching tube Q5 reverse parallel connection diode D16, substitute the Q5 in Figure 26.

As shown in figure 28, the structure of described parallel branch is identical with Figure 26, does not repeat them here.

Described chopping switch 100 comprises: switching tube Q5 and the 16 diode D16; The emitter of described switching tube Q5 connects the common port of the anode of described cut-out switch Q2 and described rectifying device D11, and the collector electrode of described switching tube Q5 connects described input voltage vin.

The negative electrode of described the 16 diode D16 connects the collector electrode of described switching tube Q5, and the anode of described the 16 diode D16 connects the emitter of described switching tube Q5.

Circuit shown in Figure 28 is similar to the operation principle of the circuit shown in Figure 26, does not repeat them here.

With reference to Figure 29, be the 8th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the present invention.Shown in Figure 29, in circuit, described chopping switch 100 comprises two metal-oxide-semiconductors.

As shown in figure 29, described auxiliary source electric capacity 200 is C1, and described cut-out switch 300 comprises the 6th switching tube Q6 and the 7th switching tube Q7, and described rectifying device comprises the 17 diode D17 and the 18 diode D18.

The parallel branch that described auxiliary source electric capacity, rectifying device, cut-out switch form is specially: the minus earth of described auxiliary source capacitor C 1, and the positive pole of described auxiliary source capacitor C 1 connects respectively the 17 negative electrode of diode D17 and the negative electrode of the 18 diode D18; The two ends of described the 6th switching tube Q6 connect respectively the negative pole of described auxiliary source capacitor C 1 and the anode of the 17 diode D17; The two ends of described the 7th switching tube Q7 connect respectively the negative pole of described auxiliary source capacitor C 1 and the anode of the 18 diode D18.

Described chopping switch 100 comprises the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9.

The source electrode of described the 8th metal-oxide-semiconductor Q8 connects the common port of the anode of described the 6th switching tube Q6 and described the 17 diode D17, and the drain electrode of described the 8th metal-oxide-semiconductor Q8 connects one end of input voltage vin.

The source electrode of described the 9th metal-oxide-semiconductor Q9 connects the common port of the anode of described the 7th switching tube Q7 and described the 18 diode D18, and the drain electrode of described the 9th metal-oxide-semiconductor Q9 connects output load one end.

The grid of the grid of described the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9 meets the first control signal V1; Control termination the second control signal V2 of the control end of described the 6th switching tube Q6 and the 7th switching tube Q7.

Circuit shown in Figure 29, detects auxiliary source voltage vcc, if auxiliary source voltage vcc lower than preset lower limit, and chopping cycle detection signal Vb is while being non-chopping cycle, controls the 6th switching tube Q6 and the 7th switching tube Q7 and turn-offs.Now, in two-wire dimmer, auxiliary source capacitor C 1 is by the 17 diode D17 (or the 18 diode D18) and the 6th switching tube Q6 (or the 7th switching tube Q7), with connect with the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9, and form loop with the output load of two-wire dimmer, AC power is 1 charging of auxiliary source capacitor C by this loop, and auxiliary source voltage vcc raises, and the output voltage of two-wire dimmer is the poor of input voltage vin and auxiliary source voltage vcc.

If auxiliary source voltage vcc is lower than preset lower limit, and chopping cycle detection signal Vb is while being chopping cycle, controls the 6th switching tube Q6 and the 7th switching tube Q7 conducting.Now, the conducting short circuit of the 6th switching tube Q6 (or the 7th switching tube Q7) series arm of auxiliary source capacitor C 1 and the 17 diode D17 (or the 18 diode D18), auxiliary source capacitor C 1 releases energy to auxiliary source load (auxiliary source load is not shown); Two-wire dimmer output voltage is zero.

When auxiliary source voltage vcc higher than set higher limit time, control the 6th switching tube Q6 and the 7th switching tube Q7 conducting; Now, if the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9 replace break-make within the half period of AC power, two-wire dimmer output chopping voltage, if the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9 in AC power conducting all the time in the cycle, two-wire dimmer output voltage is the alternating voltage of input.

Control method to the auxiliary source circuit of a kind of two-wire dimmer provided by the present invention above, be described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.

Claims

1. a control method for the auxiliary source circuit of two-wire dimmer, is characterized in that, described auxiliary source circuit comprises: the auxiliary source electric capacity and cut-out switch that form series arm; The chopping switch in parallel with described series arm;

Said method comprising the steps of:

Step 1: start;

Step 3: judge that described chopping switch whether in chopping cycle, if so, controls described auxiliary source electric capacity and do not charge, return to step 1; If not, control described auxiliary source capacitor charging, return to step 1;

In described step 3,

Described auxiliary source electric capacity is not charged as: turn-off described cut-out switch;

Described auxiliary source capacitor charging is: turn-off described in described chopping switch and conducting and cut off switch;

Or

Described auxiliary source electric capacity is not charged as: judge that whether chopping voltage control signal is chopping switch described in conducting, if so, chopping switch described in conducting; If not, turn-off described chopping switch and turn-off described cut-out switch;

2. method according to claim 1, is characterized in that, after step 1, before step 2, described method also comprises:

3. method according to claim 2, is characterized in that, after step 1, before entering step 11, also comprises:

Step 22: output failure control signal, turn-offs described cut-out switch;

4. method according to claim 1, is characterized in that, after step 1, before step 2, described method also comprises:

5. method according to claim 4, is characterized in that, after step 1, before entering step 11, also comprises:

Step 22: output failure control signal, turn-offs described cut-out switch;

6. a control method for the auxiliary source circuit of two-wire dimmer, is characterized in that, described auxiliary source circuit comprises: rectifying device and auxiliary source capacitances in series, form a series arm; Cut off switch in parallel with described series arm, form a parallel branch; Chopping switch is connected with described parallel branch again;

Said method comprising the steps of:

Step 1: start;

In described step 3,

Described auxiliary source electric capacity is not charged as: described in conducting, cut off switch;

Described auxiliary source capacitor charging is: turn-off described cut-out switch.

7. method according to claim 6, is characterized in that, after step 1, before step 2, described method also comprises:

8. method according to claim 7, is characterized in that, after step 1, before entering step 11, also comprises: