CN102751880A

CN102751880A - Method for controlling auxiliary source circuit of two-line light modulator

Info

Publication number: CN102751880A
Application number: CN201110083760XA
Authority: CN
Inventors: 姜德来; 葛良安; 华桂潮
Original assignee: Led One Hangzhou Co Ltd
Current assignee: Inventronics Hangzhou Co Ltd; Led One Hangzhou Co Ltd
Priority date: 2011-04-02
Filing date: 2011-04-02
Publication date: 2012-10-24
Anticipated expiration: 2031-04-02
Also published as: WO2012136043A1; CN102751880B

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 a chopping voltage control signal is to turn off the chopping switch, if no, the auxiliary source capacitor being charged, and if yes, the auxiliary source capacitor being not 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 the 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 be used for the changing luminous flux of lighting device light source, a kind of electric device of adjusting illumination level.Dimmer is connected between electrical network (Hot) and the load end (Dimmed Hot) usually, reaches the purpose of light modulation through the current effective value that changes the input light source.

The existing dimmer commonly used and the line of electrical network and load end have only two, therefore can be called two-wire dimmer.Two-wire dimmer inside can be adopted MOSFET (Metal-Oxide-SemiconductorField-Effect Transistor usually; Metal-oxide layer-semiconductor-field-effect transistor), semiconductor power devices such as IGBT (Insulated GateBipolar Transistor, insulated gate bipolar transistor) or controllable silicon are as chopping switch.Break-make through controlling said chopping switch can realize the control to line voltage, and the size of the copped wave angle of chopping switch is represented the size of dim signal.

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

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 when utilizing chopping switch to end is to capacitor C 1 charging.At the positive half cycle of sine wave, form charge circuit by the body diode and the load of diode D1, capacitor C 1, chopping switch 112; At sinusoidal wave negative half period, form charge circuit by the body diode and the load of diode D2, capacitor C 1, chopping switch 112, obtain boost voltage Vcc through accessory power supply 124 voltage stabilizings then.

Because obtaining of this boost voltage Vcc is that the voltage that utilizes chopping switch to end generation obtains, therefore, obtain the copped wave angle (not conducting of chopping switch) that minimum boost voltage just needs a minimum.Even and chopping switch has (very little angle) the not conducting of very short time, all can bring very big electromagnetic interference to circuit owing to the sudden change of electric current and voltage; Simultaneously, can bear the crest voltage of line voltage on the capacitor C 1, be transformed into low-voltage signal Vcc, give other circuit supplies, make that the cost of this circuit is high, efficient is low through behind the accessory power supply 124.

Summary of the invention

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

For realizing above-mentioned purpose, the invention provides following scheme: the control method of the auxiliary source circuit of two-wire dimmer, said auxiliary source circuit comprises: the auxiliary source electric capacity and cut-out switch that constitute series arm; The chopping switch parallelly connected with said series arm; Said method comprising the steps of:

Step 1: beginning;

Step 2: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step 3; If, do not return step 1;

Step 3: judge whether said chopping voltage control signal is to turn-off said chopping switch, if not, controls said auxiliary source electric capacity charging, returns step 1; If, control said auxiliary source electric capacity and do not charge, return step 1.

Preferably, in said step 3, said auxiliary source electric capacity is charged as: turn-off the said cut-out switch of said chopping switch and conducting; Said auxiliary source electric capacity is not charged as: turn-off said chopping switch and turn-off said cut-out switch.

Preferably, after step 1, before the step 2, said method also comprises:

Step 11: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if, turn-off said cut-out switch, return step 11; If, do not get into step 2.

Preferably, after step 1, before the step 2, said method also comprises:

Step 11: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step 12; If, do not get into step 2;

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

Preferably, after step 1, get into before the step 11, also comprise:

Step 21: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the false voltage value of setting, if get into step 22; If, do not get into step 11;

Step 22: the output failure control signal, turn-off said cut-out switch;

Step 23: judge whether said auxiliary source voltage is lower than the false voltage value of setting, if get into step 11; If, do not return step 22.

The embodiment of the invention also provides a kind of control method of auxiliary source circuit of two-wire dimmer, and said auxiliary source circuit comprises: rectifying device and auxiliary source capacitances in series constitute a series connection branch road; It is parallelly connected with said series arm to cut off switch, constitutes a parallelly connected branch road; Chopping switch is connected with said parallel branch again; Said method comprising the steps of:

Step 1: beginning;

Preferably, in said step 3, said auxiliary source electric capacity is charged as: turn-off said cut-out switch; Said auxiliary source electric capacity is not charged as: the said cut-out switch of conducting.

Preferably, after step 1, before the step 2, said method also comprises:

Step 11: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if the said cut-out switch of conducting returns step 11; If, do not get into step 2.

Preferably, after step 1, get into before the step 11, also comprise:

Step 22: output failure control signal, the said cut-out switch of conducting;

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

The said method of the embodiment of the invention; When auxiliary source voltage is lower than a certain preset value; At least one chopping switch is turn-offed; Auxiliary source electric capacity substitutes chopping switch and AC power, the said two-wire dimmer output load of turn-offing and forms the loop, and AC power is given said auxiliary source electric capacity charging, obtains auxiliary source voltage; After auxiliary source voltage reaches certain value, make the complete conducting of chopping switch, be operated in saturation condition, stop to reduce the loss of circuit with this to the charging of auxiliary source electric capacity; When the no-voltage in the said two-wire dimmer output of the needs chopping voltage, cut off the charge circuit of giving said auxiliary source electric capacity.

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

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.

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 invention one;

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

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

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

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

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

Fig. 8 is a kind of transmission form oscillogram of typical chopping voltage;

First kind of implementation circuit diagram of the auxiliary source circuit of Fig. 9 embodiment of the invention;

Figure 10 is the oscillogram of circuit output voltage shown in Figure 9;

Figure 11 is second kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 12 is the output voltage waveform of circuit shown in Figure 11;

Figure 13 is the third implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 14 is the 4th a kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 15 is the structure chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the invention two;

Figure 16 is the control method flow chart of auxiliary source circuit of the two-wire dimmer of the embodiment of the invention six;

Figure 17 is the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention seven;

Figure 18 is the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention eight;

Figure 19 is the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention nine;

Figure 20 is the 5th a kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 21 is the oscillogram of circuit output voltage shown in Figure 20;

Figure 22 is the 6th a kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 23 is the output voltage waveform of circuit shown in Figure 22;

Figure 24 is the 7th a kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention;

Figure 25 is the 8th a kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.

The control method of the auxiliary source circuit of the said two-wire dimmer of the embodiment of the invention; When auxiliary source voltage is lower than a certain preset value; At least one chopping switch is turn-offed; The load of alternative chopping switch that turn-offs of auxiliary source electric capacity and AC power, said two-wire dimmer output forms the loop, and AC power is given said auxiliary source electric capacity charging, acquisition auxiliary source voltage; After auxiliary source voltage reaches certain value, make the complete conducting of chopping switch, be operated in saturation condition, stop to reduce the loss of circuit with this to the charging of auxiliary source electric capacity; When the no-voltage in the said two-wire dimmer output of the needs chopping voltage, cut off the charge circuit of giving said auxiliary source electric capacity.

The auxiliary source circuit of the two-wire dimmer of the embodiment of the invention comprises: chopping switch, auxiliary source electric capacity, cut-out switch.Said auxiliary source electric capacity and said cut-out switch constitute series arm; Said chopping switch is parallelly connected with said series arm.Concrete, can be as shown in Figure 2.

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

Said auxiliary source electric capacity 20 constitutes series arm with said cut-out switch 30; Said chopping switch 10 is parallelly connected with said series arm.

When said cut-out switch 30 conductings and said chopping switch 10 turn-offed, said auxiliary source electric capacity 20 was parallelly connected with said chopping switch 10, and said auxiliary source electric capacity 20 charges; When said cut-out switch 30 turn-off, or said chopping switch 10 when cutting off the equal conducting of switch 30, said auxiliary source electric capacity 20 stops to charge.

Said control device 40, input signal is Vg, exports the first signal V1 and secondary signal V2.Wherein input signal Vg is the chopping voltage control signal of dimmer.Said control device 40 is used to detect auxiliary source voltage, according to said auxiliary source voltage and input signal Vg, exports the first signal V1 and secondary signal V2 and controls said chopping switch 10 and conducting or the shutoff of cutting off switch 30 respectively.

After connecting with the output load, said chopping switch 10 is connected in parallel on input power supply Vin two ends.

Said chopping voltage control signal is the signal of the said two-wire dimmer output voltage of control.At auxiliary source electric capacity not under the charge condition, when said chopping voltage control signal output made the signal that chopping switch 10 turn-offs, chopping switch 10 turn-offed, and said two-wire dimmer is output as no-voltage; When said chopping voltage control signal output makes the signal of chopping switch 10 conductings, chopping switch 10 conductings, said two-wire dimmer is output as non-zero voltage.If chopping switch 10 replaces break-make in the half period of AC power, then two-wire dimmer is exported chopping voltage, and in AC power conducting all the time in the cycle, then the two-wire dimmer output voltage is the alternating voltage of input as if chopping switch 10.

Said output load can be the load of Switching Power Supply class, like led driver, and gas discharge lamp ballast etc.; The light source of said output load driving can be the LED lamp, fluorescent lamp, Halogen lamp LED etc., and other characteristic similar light source.

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

With reference to Fig. 3, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention one.Said method specifically may further comprise the steps:

Step S101: beginning;

Step S102: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S103; If, do not return step S101;

Step S103: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S104; If get into step S105;

Step S104: 20 chargings of auxiliary source electric capacity, return step S101;

Step S105: auxiliary source electric capacity 20 does not charge, and returns step S101.

In the embodiment of the invention, to auxiliary source circuit shown in Figure 2,20 chargings of the electric capacity of auxiliary source described in the step S104 can be specially: turn-off chopping switch 10 and conducting and cut off switch 30; The electric capacity of auxiliary source described in the step S105 20 does not charge and is specially: turn-off chopping switch 10 and turn-off cut-out switch 30.Specifically can be as shown in Figure 4.

With reference to Fig. 4, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention two.Said method specifically may further comprise the steps:

Step S201: beginning;

Step S202: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S203; If, do not return step S201;

Step S203: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S204; If get into step S205;

Step S204: turn-off said chopping switch 10, the said cut-out switch 30 of conducting returns step S201;

Step S205: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S201.

In the embodiment of the invention two said methods, when said cut-out switch 30 conductings and said chopping switch 10 turn-offed, said auxiliary source electric capacity 20 was parallelly connected with said chopping switch 10, and said auxiliary source electric capacity 20 charges; When said cut-out switch 30 turn-off, or said chopping switch 10 when cutting off the equal conducting of switch 30, said auxiliary source electric capacity 20 stops to charge.

With reference to Fig. 5, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention three.Said method specifically may further comprise the steps:

Step S301: beginning;

Step S302: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step S303; If, do not get into step S304;

Step S303: turn-off said cut-out switch 30, return step S301;

Step S304: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S305; If, do not return step S301;

Step S305: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S306; If get into step S307;

Step S306: turn-off said chopping switch 10, the said cut-out switch 30 of conducting returns step S304;

Step S307: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S304.

Among the present invention like embodiment one, two, three said methods; Detect auxiliary source voltage, if auxiliary source voltage is lower than preset lower limit, and the output voltage of two-wire dimmer is need export non-zero voltage the time; Control said chopping switch 10 and turn-off, control said cut-out switch 30 conductings simultaneously.At this moment; In the two-wire dimmer, auxiliary source electric capacity 20 forms the loop with the output load of dimmer, and AC power is 20 chargings of auxiliary source electric capacity through 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 the output voltage that is lower than preset lower limit and two-wire dimmer when auxiliary source voltage need be exported no-voltage, then control said chopping switch 10 and turn-off, control said cut-out switch 30 simultaneously and also turn-off.At this moment, in the two-wire dimmer, AC power stops the charging to auxiliary source electric capacity 20, and auxiliary source electric capacity 20 releases energy to load; The two-wire dimmer output voltage is zero.

When auxiliary source voltage is higher than the capping value, controls said cut-out switch 30 and turn-off.

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

Need to prove that in practical application, the preset lower limit that auxiliary source voltage can be set is higher than the magnitude of voltage of auxiliary source circuit can operate as normal the time.Can guarantee like this: when auxiliary source voltage is lower than preset lower limit; And be in the time period of two-wire dimmer output no-voltage; Promptly in auxiliary source electric capacity 20 can only discharge the time period that can not charge to the auxiliary source load, guarantee that still the minimum of auxiliary source voltage can keep the operate as normal of auxiliary source circuit.

Because in the charging process; Auxiliary source electric capacity 20 voltages equal chopping switch 10 voltage; Therefore chopping switch 10 voltage can not surpass the higher limit that auxiliary source voltage is set; When 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 line voltage (like 110Vac, 220Vac, or 277Vac); And the higher limit of auxiliary source voltage vcc is controlled at several V usually to tens V; Then AC-input voltage Vin is much larger than chopping switch 10 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.

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

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

With reference to Fig. 6, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention four.The difference of embodiment four said methods and embodiment three is: when said auxiliary source voltage is higher than the capping value, can when chopping switch 10 turn-offs, also turn-off and cut off switch 30 through chopping voltage control signal control chopping switch 10; That is, when two-wire dimmer need be exported non-zero voltage, 10 conductings of control chopping switch, and when two-wire dimmer need be exported no-voltage, control chopping switch 10 turn-offed, and cut off switch 30 and turn-offed.

Said method specifically may further comprise the steps:

Step S401: beginning;

Step S402: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step S403; If, do not get into step S406;

Step S403: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S404; If get into step S405;

Step S404: the said chopping switch 10 of conducting, return step S402;

Step S405: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S402;

Step S406: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S407; If, do not return step S402;

Step S407: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S408; If get into step S409;

Step S408: turn-off said chopping switch 10, the said cut-out switch 30 of conducting returns step S406;

Step S409: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S406.

The embodiment of the invention four said methods when auxiliary source voltage is higher than the capping value, show to continue as 20 chargings of auxiliary source electric capacity.And during chopping switch 10 conductings, its two ends pressure drop is zero, and no matter said cut-out switch 30 is conductings or turn-offs, and can not cause the charging to auxiliary source electric capacity 20.At this moment, when only needing to guarantee that said chopping switch 10 turn-offs, said cut-out switch 30 turn-offs and gets final product.Need to guarantee that the reason of cutting off switch 30 shutoffs is, when chopping switch 10 turn-offed, its voltage was a line voltage, in order to guarantee that auxiliary source electric capacity 20 and other devices are not damaged, need when chopping switch 10 turn-offs, stop to 20 chargings of auxiliary source electric capacity.Equally, in the embodiment four said methods, when said cut-out switch 30 turn-offs, also can reach the purpose that said auxiliary source electric capacity 20 is not charged.

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 invention five.The difference of embodiment five said methods and embodiment three is: before judging whether said auxiliary source voltage is higher than the capping value, judge whether said auxiliary source voltage is higher than the false voltage value of setting earlier; If be higher than the false voltage value of setting, then directly turn-off said cut-out switch 30, detect said auxiliary source voltage again and whether be lower than the false voltage value; If still be higher than said false voltage value after turn-offing said cut-out switch 30; Then export failure control signal and the said cut-out switch 30 of control shutoff; If be lower than said false voltage value after turn-offing said cut-out switch 30, then do not export failure control signal and get into normal mode of operation.Its judged result gets into normal mode of operation for not the time when judging whether said auxiliary source voltage is higher than the false voltage value of setting, judges whether said auxiliary source voltage is higher than the capping value.

Concrete, embodiment five said methods can may further comprise the steps:

Step S501: beginning;

Step S502: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the false voltage value of setting, if get into step S503; If, do not get into step S505;

Step S503: the output failure control signal, and turn-off said cut-out switch 30;

Step S504: judge whether said auxiliary source voltage is lower than the false voltage value of setting, if get into step S505; If, do not return step S503;

Step S505: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step S506; If, do not get into step S509;

Step S506: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S507; If get into step S508;

Step S507: the said chopping switch 10 of conducting, return step S505;

Step S508: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S505;

Step S509: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S510; If, do not return step S502;

Step S510: judge that whether said chopping voltage control signal is to turn-off said chopping switch 10, if not, gets into step S511; If get into step S512;

Step S511: turn-off said chopping switch 10, the said cut-out switch 30 of conducting returns step S509;

Step S512: turn-off said chopping switch 10, turn-off said cut-out switch 30, return step S509.

The embodiment of the invention five said methods; Before getting into normal mode of operation, judge at first whether said auxiliary source voltage is higher than the false voltage value of setting, if be higher than the false voltage value of setting; Then export failure control signal; Only when auxiliary source voltage is lower than the false voltage value of setting, begin operate as normal again, realized protection thus auxiliary source circuit.

Chopping voltage to the light source drive of back level, is distinguished different conditioning signal through the difference at copped wave phase angle as a kind of conditioning signal, and this variation of light source drive response of back level can realize the adjusting to light source.

The send mode of said chopping voltage has multiple, can for: (1) two-wire dimmer is exported chopping voltage all the time, and each constantly all sends conditioning signal; (2) two-wire dimmer a plurality of AC power cycles of interval are sent one group of chopping voltage, and said one group of chopping voltage can be the chopping voltage in one or more AC power cycle.Specifically, 10 alternate conduction in the partial periodicity of AC power of chopping switch, two-wire dimmer output chopping voltage, and conducting all the time in all the other cycles of AC power, the two-wire dimmer output voltage is an input ac voltage.

With reference to Fig. 8, be a kind of transmission form oscillogram of typical chopping voltage.Chopping voltage shown in Figure 8 is the oscillogram of aforementioned (2) kind send mode, and a plurality of AC power cycles are sent one group of chopping voltage at interval, and this group chopping voltage comprises the chopping voltage of (shown in Figure 8 is 4) in several AC power cycles.

The auxiliary source circuit of the said two-wire dimmer of the embodiment of the invention, when auxiliary source voltage was lower than preset lower limit, this two-wire dimmer output non-zero voltage was obtained accessory power supply; And when said two-wire dimmer is exported no-voltage, cut off the charge circuit of said auxiliary source electric capacity 20, stop to obtain accessory power supply.

Preferably; The control method of the auxiliary source circuit that can the embodiment of the invention one to five be provided and the chopping voltage send mode (2) of the said two-wire dimmer that Fig. 8 provides combine; Make accessory power supply only in the time of said two-wire dimmer output no-voltage, stop to obtain accessory power supply, and this no-voltage only continue (promptly to send in several ac cycles of chopping voltage) in several ac cycles.This mode is more prone to obtain stable auxiliary source; Simultaneously, only copped wave in several cycles of AC power can further reduce EMI (Electromagnetic Interference, electromagnetic interference).

In conjunction with shown in Figure 2, the auxiliary source circuit structure chart of the two-wire dimmer of the embodiment of the invention one, said auxiliary source electric capacity 20 constitutes series arm with said cut-out switch 30; Said chopping switch 10 is parallelly connected with said series arm.

Said control device 40 is used to detect auxiliary source voltage, is used to control the first signal V1 of said chopping switch 10 break-makes and the secondary signal V2 of said cut-out switch 30 break-makes of control according to said auxiliary source voltage output.

Concrete; When said chopping voltage control signal Vg is when turn-offing chopping switch 10; 10 shutoffs of said control device 40 outputs first signal V1 control chopping switch, output secondary signal V2 control is cut off switch 30 and is turn-offed, and makes said two-wire dimmer export no-voltage.

When said chopping voltage control signal Vg is not when turn-offing chopping switch 10 (being the said chopping switch 10 of conducting); Be lower than lower limit at the auxiliary source voltage vcc; Auxiliary source electric capacity 20 needs under the situation of charging, and said control device 40 outputs first signal V1 control chopping switch 10 turn-offs, and switch 30 conductings are cut off in output secondary signal V2 control; At this moment, the voltage at chopping switch 10 two ends gives auxiliary source electric capacity 20 chargings through cutting off switch 30; If AC-input voltage Vin is that line voltage is (like 110Vac; 220Vac; 277Vac), and the auxiliary source voltage vcc is controlled at several V usually to tens V, and then AC-input voltage Vin is much larger than chopping switch 10 voltage; Therefore 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.

When said chopping voltage control signal Vg is not when turn-offing chopping switch 10; Be higher than higher limit at the auxiliary source voltage vcc; Auxiliary source electric capacity 20 does not need under the charge condition, 10 conductings of said control device 40 outputs first signal V1 control chopping switch, and output secondary signal V2 control is cut off switch 30 and is turn-offed; The two-wire dimmer output voltage is an AC-input voltage, also is non-zero voltage.

Concrete way of realization in the face of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention one describes in detail down.

With reference to Fig. 9, first kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 9, said chopping switch 10 is made up of rectifier bridge and single-way switch.

As shown in Figure 9, said auxiliary source electric capacity 20 is C1, and said cut-out switch 30 is Q2; Said auxiliary source capacitor C 1 is connected with said cut-out switch Q2, constitutes a series connection branch road; Said series arm is parallelly connected with the rectification bridge output end of said chopping switch 10, and the rectifier bridge input of chopping switch 10 is connected between the 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.

Said series arm is specially: the minus earth of said auxiliary source capacitor C 1, the positive pole of said auxiliary source capacitor C 1 connect the end of said cut-out switch Q2.

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

Said chopping switch 10 is the bidirectional switch that a switching tube Q1 and a rectifier bridge constitute; Wherein, said rectifier bridge is made up of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4.

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

Said first diode D1 and second diode D2 series connection, the negative electrode of the said first diode D1 connects the anode of the said second diode D2.

Said the 3rd diode D3 connects with the 4th diode D4, and the negative electrode of said the 3rd diode D3 connects the anode of said the 4th diode D4.

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

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

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

Voltage is the auxiliary source voltage vcc on the said auxiliary source capacitor C 1.

Need to prove that the switching tube Q1 of formation chopping switch 10 shown in Figure 9 only is that example describes with the metal-oxide-semiconductor.In practical application, any unidirectional switching tube can constitute the chopping switch of the embodiment of the invention as diagram switching tube Q1.

In the circuit shown in Figure 9; 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 C 1 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, when cutting off switch Q2 shutoff, said auxiliary source capacitor C 1 is to the 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, said auxiliary source capacitor C 1 discharge, the output voltage V o of dimmer is zero.

To auxiliary source circuit shown in Figure 9, if in the half period of alternating voltage Vin, make said two-wire dimmer alternately be output as no-voltage and non-zero voltage, then the output voltage of said two-wire dimmer is a chopping voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 9 be during afterwards along the control signal of dimmer, the waveform of output voltage V o is shown in figure 10.

Among Figure 10, dotted line is the input voltage vin of said two-wire dimmer, is sinusoidal ac; When being embodied as said auxiliary source electric capacity and not charging, the output voltage V o of said two-wire dimmer is chopping voltage.

With reference to Figure 11, second kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 11, said chopping switch 10 is made up of single-way switch.Compare with circuit shown in Figure 9, circuit shown in Figure 11 also comprises: the rectifying device D5 that connects with said auxiliary source capacitor C 1 and cut-out switch Q2.

Shown in figure 11, said auxiliary source electric capacity 20 is C1, and said cut-out switch 30 is Q2; Said auxiliary source capacitor C 1, said cut-out switch Q2 and rectifying device D5 series connection constitute a series connection branch road; Said series arm and said chopping switch 10 and be connected in input voltage vin and the output load between.

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

Said chopping switch 10 comprises: metal-oxide-semiconductor Q1; The source electrode of said metal-oxide-semiconductor Q1 connects an end of output load, and the drain electrode of said switching tube Q1 connects the end that said series arm connects input voltage vin.Be connected in parallel on the input voltage vin two ends after two-wire dimmer and the load series connection.

Circuit shown in Figure 11 is similar with the operation principle of circuit shown in Figure 9, repeats no more at this.Different with circuit shown in Figure 9 is when circuit shown in Figure 11 sends chopping voltage at two-wire dimmer, to export chopping voltage in the half period; In another half period, the body diode conducting of said switching tube Q1.Be, the chopping voltage of said two-wire dimmer output is a chopping voltage in one of them half period in an ac cycle, is AC-input voltage in another half period.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 10 be during afterwards along the control signal of dimmer, the output voltage waveforms of circuit shown in Figure 11 is shown in figure 12.

Need to prove that formation chopping switch 10 shown in Figure 11 only is that example describes with the metal-oxide-semiconductor.In practical application, can adopt the mode of single-way switch pipe reverse parallel connection diode to substitute the chopping switch that switching tube Q1 shown in Figure 11 constitutes the embodiment of the invention.For example, chopping switch 10 shown in Figure 13.

With reference to Figure 13, the third implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 13, said chopping switch 10 is made up of single-way switch.Compare with circuit shown in Figure 11, substitute the Q1 among Figure 11 by switching tube Q1 reverse parallel connection diode D6 in the circuit shown in Figure 13.

Shown in figure 13, said auxiliary source electric capacity 20 is C1, and said cut-out switch 30 is Q2; Said auxiliary source capacitor C 1, said cut-out switch Q2 and rectifying device D5 series connection constitute a series connection branch road; Said series arm and said chopping switch 10 and be connected in input voltage vin and the output load between.

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

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

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

Circuit shown in Figure 13 is similar with the operation principle of circuit shown in Figure 11, repeats no more at this.

With reference to Figure 14, the 4th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 14, said chopping switch 10 is made up of two metal-oxide-semiconductors.

Shown in figure 14, said auxiliary source electric capacity 20 is C1, and said cut-out switch 30 is Q2; Said auxiliary source capacitor C 1, said cut-out switch Q2, connect with two diodes respectively, constitute two series arms; Said each series arm is parallelly connected with each switching tube in the said chopping switch 10.

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

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

Said 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 said the 3rd metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4 is ground connection together.

Said first series arm is parallelly connected with the 3rd metal-oxide-semiconductor Q3 of chopping switch 10, and said second series arm is parallelly connected with the 4th metal-oxide-semiconductor Q4 of chopping switch 10.

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

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

Circuit shown in Figure 14 is similar with the operation principle of circuit shown in Figure 9, repeats no more at this.

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

Preferably, the said series arm parallelly connected with chopping switch can be for one or more.

The embodiment of the invention also provides a kind of auxiliary source circuit of two-wire dimmer.The difference of the circuit that provides with previous embodiment is that this circuit comprises: chopping switch, auxiliary source electric capacity, cut off switch, rectifying device.Said rectifying device and said auxiliary source capacitances in series constitute a series connection branch road; Said cut-out switch is parallelly connected with said series arm, constitutes a parallelly connected branch road; Said chopping switch is connected with said parallel branch again.Concrete, can be shown in figure 15.

With reference to Figure 15, be the structure chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention two.The accessory power supply of said two-wire dimmer can comprise: chopping switch 100, auxiliary source electric capacity 200, cut-out switch 300, rectifying device 400, control device 500.

Said rectifying device 400 is connected with said auxiliary source electric capacity 200, constitutes a series connection branch road; Said cut-out switch 300 is parallelly connected with said series arm, constitutes a parallelly connected branch road; Said chopping switch 100 is connected with said parallel branch again.

When said cut-out switch 300 turn-offed, said auxiliary source electric capacity 200 was connected with said chopping switch 100, and auxiliary source electric capacity 200 is through said rectifying device 400 chargings; When said cut-out switch 300 conductings, said auxiliary source electric capacity 200 stops charging.

Said chopping switch 100, cut off switch 300 simultaneously and be connected in parallel on input power supply Vin two ends after the output load series connection.Said control device 500 input signals are Vg, export the first signal V1 and secondary signal V2.Wherein input signal Vg is the chopping voltage control signal of dimmer.Said control device 500 is used to detect auxiliary source voltage, according to said auxiliary source voltage and input signal Vg, exports the first signal V1 and secondary signal V2 and controls said chopping switch 100 and conducting or the shutoff of cutting off switch 300 respectively.

Said chopping voltage control signal Vg is the signal of the said two-wire dimmer output voltage of control.

When said chopping voltage control signal output made the signal of chopping switch 100 shutoffs, control device 500 outputs first signal V1 control chopping switch 100 turn-offed, and output secondary signal V2 controls and cuts off switch 300 conductings, and said two-wire dimmer is output as no-voltage; When the output of chopping voltage control signal does not make the signal of chopping switch 100 shutoffs; 100 conductings of control device 500 outputs first signal V1 control chopping switch; Voltage vcc at auxiliary source electric capacity 200 is lower than lower limit, and auxiliary source electric capacity 200 needs under the charge condition, and control device 500 output secondary signal V2 controls are cut off switch 300 and turn-offed; Auxiliary source electric capacity 200 is connected in parallel on through rectifying device and cuts off switch 300 two ends; Usually the voltage vcc of auxiliary source electric capacity 200 is very low, has only about several V two-wire dimmer output non-zero voltage; Voltage vcc at auxiliary source electric capacity 200 is higher than higher limit, and auxiliary source electric capacity 200 does not need under the charge condition, and control device 500 output secondary signal V2 controls are 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 invention two, the embodiment of the invention provides a kind of accessory power supply control method of two-wire dimmer.

With reference to Figure 16, be the control method flow chart of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention six.Said method specifically may further comprise the steps:

Step S601: beginning;

Step S602: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S603; If, do not return step S602;

Step S603: judge that whether said chopping voltage control signal is to turn-off said chopping switch 100, if not, gets into step S604; If get into step S605;

Step S604: 200 chargings of auxiliary source electric capacity, return step S602;

Step S605: auxiliary source electric capacity 200 does not charge, and returns step S602.

Need to prove that in the embodiment of the invention, when said chopping voltage control signal output made the signal of chopping switch 100 shutoffs, said two-wire dimmer was output as no-voltage; When said chopping voltage control signal output made the signal of chopping switch 100 conductings, said two-wire dimmer was output as non-zero voltage.

In the embodiment of the invention, to auxiliary source circuit shown in Figure 15,200 chargings of the electric capacity of auxiliary source described in the step S604 can be specially: turn-off and cut off switch 300; The electric capacity of auxiliary source described in the step S605 200 does not charge and is specially: switch 300 is cut off in conducting.Specifically can be shown in figure 17.

With reference to Figure 17, be the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention seven.Said method specifically may further comprise the steps:

Step S701: beginning;

Step S702: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S703; If, do not return step S702;

Step S703: judge that whether said chopping voltage control signal is to turn-off said chopping switch 100, if not, gets into step S704; If get into step S705;

Step S704: turn-off said cut-out switch 300, return step S702;

Step S705: the said cut-out switch 300 of conducting, return step S702.

The embodiment of the invention seven said methods, when said cut-out switch 300 turn-offed, said auxiliary source electric capacity 200 was connected with said chopping switch 100, and auxiliary source electric capacity 200 is through said rectifying device 400 chargings; When said cut-out switch 300 conductings, said auxiliary source electric capacity 200 stops charging.

With reference to Figure 18, be the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention eight.Said method specifically may further comprise the steps:

Step S801: beginning;

Step S802: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step S803; If, do not get into step S804;

Step S803: the said cut-out switch 300 of conducting, return step S802;

Step S804: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S805; If, do not return step S802;

Step S805: judge that whether said chopping voltage control signal is to turn-off said chopping switch 100, if not, gets into step S806; If get into step S807;

Step S806: turn-off said cut-out switch 300, return step S804;

Step S807: the said cut-out switch 300 of conducting, return step S804.

The embodiment of the invention eight said methods detect auxiliary source voltage, when auxiliary source voltage is lower than preset lower limit and 100 conductings of said chopping switch, controls said cut-out switch 300 and turn-off.At this moment, in the two-wire dimmer, said auxiliary source electric capacity 200 with cut off switch 300 parallel connections, constitute a parallelly connected branch road, this parallel branch again with said chopping switch 100 series connection, and form the loop with the output load of two-wire dimmer.At this moment, AC power is 200 chargings of auxiliary source electric capacity through 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 when auxiliary source voltage is lower than preset lower limit and 100 shutoffs of said chopping switch, control said cut-out switch 300 conductings.At this moment, the conducting short circuit of said cut-out switch 300 series arm that constitutes of auxiliary source electric capacity 200 and rectifying device, said auxiliary source electric capacity 200 releases energy to auxiliary source load (not shown).The output voltage of two-wire dimmer is zero.

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

Preferably, said 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 said auxiliary source electric capacity.Said Voltage stabilizing module can comprise voltage-stabilizing device or the voltage stabilizing circuit that is made up of voltage-stabilizing device or linear voltage-stabilizing circuit etc.; Said boost module can for example can be the BOOST circuit for boost converter circuit etc.

Need to prove that in practical application, the preset lower limit that said auxiliary source voltage can be set is higher than the magnitude of voltage of auxiliary source circuit can operate as normal the time.Can guarantee like this: export in the time period of no-voltage when auxiliary source voltage is lower than said preset lower limit and is in two-wire dimmer; Promptly in auxiliary source electric capacity can only discharge the time period that can not charge to the auxiliary source load, guarantee that still the minimum of auxiliary source voltage can keep the operate as normal of auxiliary source circuit.

Because in charging process; The voltage of auxiliary source electric capacity equals to cut off switch ends voltage; Therefore cut off the capping value that switch ends voltage can not surpass auxiliary source voltage; When 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.

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

With reference to Figure 19, be the accessory power supply control method flow chart of the two-wire dimmer of the embodiment of the invention nine.Said method specifically may further comprise the steps:

Step S901: beginning;

Step S902: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the false voltage value of setting, if get into step S903; If, do not get into step S905;

Step S903: output failure control signal, and the said cut-out switch 300 of conducting;

Step S904: judge whether said auxiliary source voltage is lower than the false voltage value of setting, if get into step S905; If, do not return step S903;

Step S905: detect current auxiliary source voltage, judge whether said auxiliary source voltage is higher than the capping value, if get into step S906; If, do not get into step S907;

Step S906: the said cut-out switch 300 of conducting, return step S905;

Step S907: detect current auxiliary source voltage, judge whether said auxiliary source voltage is lower than preset lower limit, if get into step S908; If, do not return step S902;

Step S908: judge that whether said chopping voltage control signal is to turn-off said chopping switch 100, if not, gets into step S909; If get into step S910;

Step S909: turn-off said cut-out switch 300, return step S907;

Step S910: the said cut-out switch 300 of conducting, return step S907.

The embodiment of the invention nine said methods, when detecting auxiliary source voltage and be higher than the false voltage value of setting, the said cut-out switch 300 of conducting, and then detect the false voltage value whether said auxiliary source voltage is lower than setting; If after cutting off switch 300 conductings, said auxiliary source voltage is lower than the false voltage value of setting, does not then export failure control signal and directly gets into normal mode of operation; If after cutting off switch 300 conductings, said auxiliary source voltage still is higher than the false voltage value of setting, then continues the output failure control signal and control said cut-out switch conduction.Can realize thus, occur at auxiliary source circuit under the situation of unusual or fault auxiliary source circuit being protected.

Same; The control mode of the auxiliary source circuit that also can the embodiment of the invention seven to nine be provided and the chopping voltage send mode (2) of the said two-wire dimmer that Fig. 8 provides combine; Make accessory power supply only in the time of said two-wire dimmer output no-voltage, stop to obtain accessory power supply, and this no-voltage only continue (promptly to send in several ac cycles of chopping voltage) in several ac cycles.This mode is more prone to obtain stable auxiliary source; Simultaneously, only copped wave in several cycles of AC power can further reduce EMI.

In conjunction with shown in Figure 15, the auxiliary source circuit structure chart of the two-wire dimmer of the embodiment of the invention two, said rectifying device 400 is connected with said auxiliary source electric capacity 200, constitutes a series connection branch road; Said cut-out switch 300 is parallelly connected with said series arm, constitutes a parallelly connected branch road; Said chopping switch 100 is connected with said parallel branch again.

Said control circuit 500 is used to detect the auxiliary source voltage vcc, is used to control the first signal V1 of said chopping switch 100 break-makes and the secondary signal V2 of said cut-out switch 300 break-makes of control according to said auxiliary source voltage output.

Concrete, when said chopping voltage control signal Vg was shutoff chopping switch 100, said control circuit 500 was exported first signal V1 control chopping switch 100 and is turn-offed, and exported secondary signal V2 and controlled 300 conductings of cut-out switch, two-wire dimmer output no-voltage.

When said chopping voltage control signal Vg is not when turn-offing chopping switch 100; 100 conductings of said control circuit 500 outputs first signal V1 control chopping switch; Be lower than lower limit at the auxiliary source voltage vcc; Auxiliary source electric capacity 200 needs under the charge condition, and output secondary signal V2 control is cut off switch 300 and turn-offed, and cuts off the voltage at switch 300 two ends and gives auxiliary source electric capacity 200 chargings through rectifying device 400; If AC-input voltage Vin is that line voltage is (like 110Vac; 220Vac; 277Vac), and the auxiliary source voltage vcc is controlled at several V usually to tens V, and AC-input voltage Vin is much larger than chopping switch 100 voltage; Therefore the output voltage of two-wire dimmer equals the voltage that AC-input voltage Vin deducts chopping switch 100 two ends, is non-zero voltage.

When said chopping voltage control signal Vg is not when turn-offing chopping switch 100; 100 conductings of said control circuit 500 outputs first signal V1 control chopping switch; Be higher than higher limit at the auxiliary source voltage vcc, auxiliary source electric capacity 200 does not need under the charge condition, and switch 300 conductings are cut off in output secondary signal V2 control; The two-wire dimmer output voltage is an AC-input voltage, also is non-zero voltage.

Concrete way of realization in the face of the auxiliary source circuit of the two-wire dimmer of the embodiment of the invention two describes in detail down.

With reference to Figure 20, be the 5th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 20, said chopping switch 100 is made up of rectifier bridge and single-way switch.

Shown in figure 20, said auxiliary source electric capacity 200 is C1, and said cut-out switch 300 is Q2, and said rectifying device is D11; Said auxiliary source capacitor C 1 is connected with rectifying device D11, constitutes a series connection branch road, and this series arm is parallelly connected with said cut-out switch Q2 again, constitutes a parallelly connected branch road; Said chopping switch 100 is connected with this parallel branch.

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

Said chopping switch 100 is the bidirectional switch that a switching tube Q5 and a rectifier bridge constitute; Wherein, said rectifier bridge is made up of the 12 diode D12, the 13 diode D13, the 14 diode D14, the 15 diode D15.

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

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

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

The drain electrode of said switching tube Q5 connects the common port of the negative pole of said cut-out switch Q2 and said auxiliary source capacitor C 1.

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

Be connected in parallel on input Vin two ends after two-wire dimmer and the load series connection.

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

Need to prove that the switching tube Q5 of formation chopping switch 100 shown in Figure 20 only is that example describes with the metal-oxide-semiconductor.In practical application, any unidirectional switching tube can constitute the chopping switch of the embodiment of the invention as diagram switching tube Q1.

In the circuit shown in Figure 20, when control switch pipe Q5 conducting, cut-out switch Q2 shutoff, 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, when cutting off switch Q2 conducting, said auxiliary source capacitor C 1 discharge, its output voltage equals input voltage vin; When control switch pipe Q5 turn-offed, cuts off switch Q2 conducting, said auxiliary source capacitor C 1 was to the discharge of auxiliary source load (not shown), and its output voltage is zero.

To auxiliary source circuit shown in Figure 20, if in the half period of alternating voltage Vin, make two-wire dimmer alternately be output as no-voltage and non-zero voltage, then the output voltage of said two-wire dimmer is a chopping voltage.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 20 be during afterwards along the dimmer control signal, the waveform of output voltage V o can be shown in figure 21.

With reference to Figure 22, be the 6th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 22, said chopping switch 100 is made up of single-way switch.

Shown in figure 22, said auxiliary source electric capacity 200 is C1, and said cut-out switch 300 is Q2, and said rectifying device is D11; Said auxiliary source capacitor C 1 is connected with rectifying device D11, constitutes a series connection branch road, and this series arm is parallelly connected with said cut-out switch Q2 again, constitutes a parallelly connected branch road; Said chopping switch 100 is connected with this parallel branch.

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

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

The other end of input voltage vin links to each other with the other end of output load.

Circuit shown in Figure 22 is similar with the operation principle of circuit shown in Figure 20, repeats no more at this.Different with circuit shown in Figure 20 is when circuit shown in Figure 22 sends chopping voltage at two-wire dimmer, to export chopping voltage in the half period; In another half period, the body diode conducting of said switching tube Q5.Be, the chopping voltage of said two-wire dimmer output is a chopping voltage in one of them half period in an ac cycle, is AC-input voltage in another half period.Concrete, when the chopping voltage control signal Vg of circuit shown in Figure 22 be during afterwards along the dimmer control signal, output voltage V o waveform is shown in figure 23.

Need to prove that the switching tube Q5 of formation chopping switch 100 shown in Figure 22 only is that example describes with the metal-oxide-semiconductor.In practical application, can adopt the mode of single-way switch pipe reverse parallel connection diode to substitute the chopping switch that switching tube Q5 shown in Figure 22 constitutes the embodiment of the invention.For example, chopping switch 100 shown in Figure 24.

With reference to Figure 24, be the 7th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 24, said chopping switch 100 is made up of single-way switch.Compare with circuit shown in Figure 22, substitute the Q5 among Figure 22 by switching tube Q5 reverse parallel connection diode D16 in the circuit shown in Figure 24.

Shown in figure 24, the structure of said parallel branch is identical with Figure 22, repeats no more at this.

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

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

Circuit shown in Figure 24 is similar with the operation principle of circuit shown in Figure 22, repeats no more at this.

With reference to Figure 25, be the 8th kind of implementation circuit diagram of the auxiliary source circuit of the embodiment of the invention.In the circuit shown in Figure 25, said chopping switch 100 is made up of two metal-oxide-semiconductors.

Shown in figure 25, said auxiliary source electric capacity 200 is C1, and said cut-out switch 300 comprises the 6th switching tube Q6 and the 7th switching tube Q7, and said rectifying device comprises the 17 diode D17 and the 18 diode D18.

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

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

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

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

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

Circuit shown in Figure 25 detects the auxiliary source voltage vcc, if the auxiliary source voltage vcc is lower than preset lower limit, and when the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9 conducting, controls the 6th switching tube Q6 and the 7th switching tube Q7 and turn-offs.At this moment; In the two-wire dimmer, auxiliary source capacitor C 1 is passed through the 17 diode D17 (or the 18 diode D18) and the 6th switching tube Q6 (or the 7th switching tube Q7) parallel connection, and connects with the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9; Form the loop with the output load of two-wire dimmer; AC power is 1 charging of auxiliary source capacitor C through this loop, and the 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 the auxiliary source voltage vcc is lower than preset lower limit, and the 8th metal-oxide-semiconductor Q8 and the 9th metal-oxide-semiconductor Q9 control the 6th switching tube Q6 and the 7th switching tube Q7 conducting when turn-offing.At this moment; 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 (the auxiliary source load is not shown); The two-wire dimmer output voltage is zero.

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

More than to the control method of the auxiliary source circuit of a kind of two-wire dimmer provided by the present invention; Carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part all can change on embodiment and range of application.In sum, this description should not be construed as limitation of the present invention.

Claims

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

Said method comprising the steps of:

Step 1: beginning;

2. method according to claim 1 is characterized in that, in said step 3,

Said auxiliary source electric capacity is charged as: turn-off the said cut-out switch of said chopping switch and conducting;

Said auxiliary source electric capacity is not charged as: turn-off said chopping switch and turn-off said cut-out switch.

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

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

5. according to claim 3 or 4 described methods, it is characterized in that, after step 1, get into before the step 11, also comprise:

Step 22: the output failure control signal, turn-off said cut-out switch;

6. the control method of the auxiliary source circuit of a two-wire dimmer is characterized in that, said auxiliary source circuit comprises: rectifying device and auxiliary source capacitances in series constitute a series connection branch road; It is parallelly connected with said series arm to cut off switch, constitutes a parallelly connected branch road; Chopping switch is connected with said parallel branch again;

Said method comprising the steps of:

Step 1: beginning;

7. method according to claim 6 is characterized in that, in said step 3,

Said auxiliary source electric capacity is charged as: turn-off said cut-out switch;

Said auxiliary source electric capacity is not charged as: the said cut-out switch of conducting.

8. method according to claim 7 is characterized in that, after step 1, before the step 2, said method also comprises:

9. method according to claim 8 is characterized in that, after step 1, gets into before the step 11, also comprises:

Step 22: output failure control signal, the said cut-out switch of conducting;