CN104703372A - Dimming circuit and method - Google Patents
Dimming circuit and method Download PDFInfo
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- CN104703372A CN104703372A CN201310671347.4A CN201310671347A CN104703372A CN 104703372 A CN104703372 A CN 104703372A CN 201310671347 A CN201310671347 A CN 201310671347A CN 104703372 A CN104703372 A CN 104703372A
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Abstract
The invention relates to a dimming circuit. The dimming circuit comprises an alternating current-direct current conversion circuit and a direct current-alternating current conversion circuit, wherein alternating current-direct current conversion circuit is used for converting alternating-current voltage into direct-current voltage, and the direct current-alternating current conversion circuit is used for converting the direct-current voltage into the working voltage of a lamp. The direct current-alternating current conversion circuit comprises a drive circuit used for providing drive voltage between a reference contact and a control contact and a conversion circuit which is coupled to the drive circuit and comprises at least one switch. The dimming circuit has the advantages that at least one electric parameter between the reference contact and the control contact is adjusted to change the working frequency of the direct current-alternating current conversion circuit so as to adjust the brightness of the lamp; each electric parameter selected from one inductance parameter and one capacitance parameter; the dimming circuit provides simple circuit connection, and dimming is achieved by changing the electric parameters between the reference contact and the control contact.
Description
Technical field
The present invention is about a kind of light adjusting circuit and light-dimming method, and this light adjusting circuit and light-dimming method can be used for gaseous discharge lamp or other lamps of the same type, particularly relates to a kind ofly carry out the light adjusting circuit of three tunnel light modulations and apply the light-dimming method of this light adjusting circuit.
Background technology
In order to meet the demand of different application condition and the target of energy-saving and emission-reduction of throwing light on, there is the various dimming ballast that can control gaseous discharge lamp brightness change.
Gaseous discharge lamp changes the electric current flowing through gaseous discharge lamp and then the object reaching the brightness of adjustments of gas discharge lamp by the operating frequency of the ballast of change gas discharge lamp.The core of dimming ballast can be summed up as carries out FREQUENCY CONTROL to ballast inverter, by controlling the frequency of oscillation of ballast internal inverters, realizes the adjustment of gaseous discharge lamp brightness.US Patent No. 6078143 discloses the type of the gate drive circuit for this ballast circuit, be with the gaseous discharge lamp of the complementary conductivity type switch of the DC-AC converter of FEEDBACK CONTROL pair of series connection, but this ballast circuit does not realize light modulation by gate drive circuit.
The sectional dimming that the light modulation of gas discharge lamp ballast is divided into the continuous light tuning of gradual change and brightness to change step by step.Common sectional dimming can be three road light adjusting types.
The gaseous discharge lamp of traditional sectional dimming, mostly control different power stages by use one integrated circuit (IC), and then the brightness of gaseous discharge lamp is controlled, reach energy-conservation object, but because the unit price of integrated circuit (IC) is higher, the price of gaseous discharge lamp cannot be effectively reduced.
US Patent No. 5866993 discloses the three road dimmable ballast circuit that one can not use integrated circuit (IC).This three roads dimmable ballast circuit adopts PPFC (Passive Power Factor Correction) to be connected with complicated circuit, utilizes frequency conversion function to produce different high-frequency signals to reach the object of light modulation.This topology employs electromagnetic interface filter and the circuit more and more complicated than the number of elements of conventional gas discharge lamp.
Therefore, be necessary light adjusting circuit and light-dimming method that a kind of improvement is provided, use the connection of simple circuit just can realize three tunnel light modulations and solve above mentioned technical problem.
Summary of the invention
Main purpose of the present invention is to provide a kind of light adjusting circuit and light-dimming method, can be connected can realize gaseous discharge lamp or other Deng tri-tunnel light modulations of the same type by simple circuit.
One aspect of the present invention is to provide a kind of light adjusting circuit.Described light adjusting circuit comprises an AC-DC change-over circuit, for converting an alternating voltage of AC power to a direct voltage.One DC-ac conversion circuit, be coupled between described AC-DC change-over circuit and a lamp, described DC-ac conversion circuit is used for the operating voltage described direct voltage being converted to described lamp, described DC-ac conversion circuit also comprises: one drive circuit, for controlling to provide a driving voltage between contact at a reference-junction and one, described drive circuit comprises a variable electrical quantity generation module to provide at least one electrical quantity, and described electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter; One change-over circuit, is coupled to described drive circuit and comprises at least one switch, and the conducting state of described at least one switch determined by the driving voltage of described drive circuit.By regulating the described at least one electrical quantity between described reference-junction and described control contact, change the operating frequency of described DC-ac conversion circuit, thus regulate the brightness of described lamp.
Another aspect of the present invention is to provide a kind of light-dimming method, for regulating the brightness of a lamp.Described light-dimming method comprises and converts the alternating voltage of an AC power to a direct voltage by an AC-DC change-over circuit.By a DC-ac conversion circuit, described direct voltage is converted to an operating voltage of described lamp.By the brightness regulating an operating frequency of described DC-ac conversion circuit to regulate described lamp, described operating frequency is regulated specifically to comprise: determine that a reference-junction and of described DC-ac conversion circuit controls contact, the voltage between described reference-junction and described control contact determines the conducting state of at least one switch in DC-ac conversion circuit; By the operating frequency regulating at least one electrical quantity between described reference-junction and described control contact to regulate described DC-ac conversion circuit, described electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter.
The present invention is mainly through changing the electrical quantity of place in circuit, electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter, thus the operating frequency changing DC-ac conversion circuit regulates the brightness of lamp, connected the object reaching gaseous discharge lamp three tunnel light modulation by simple circuit.
Accompanying drawing explanation
In order to understand the present invention better, in conjunction with the drawings the specific embodiment of the present invention is described further, wherein:
Fig. 1 is the functional block diagram of light adjusting circuit of the present invention.
Fig. 2 is the circuit diagram of the first execution mode of light adjusting circuit in Fig. 1.
Fig. 3 is the circuit diagram of the second execution mode of light adjusting circuit in Fig. 1.
Fig. 4 is the circuit diagram of the 3rd execution mode of light adjusting circuit in Fig. 1.
Figure 5 shows that the schematic diagram of three road input incoming transport power supplys of light adjusting circuit of the present invention.
Embodiment
Unless otherwise defined, technical term used herein or scientific terminology should be in field belonging to the present invention the ordinary meaning that the personage with general technical ability understands." first " " second " used in patent application specification of the present invention and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different parts.Equally, the similar word such as " " or " " does not represent restricted number yet, but represents to there is at least one." comprise " or the similar word such as " comprising " mean to appear at " comprising " or " comprising " before element or object contain the element or object that appear at " comprising " or " comprising " presented hereinafter and equivalent, do not get rid of other elements or object." connection " or " being connected " etc. similar word be not defined in physics or the connection of machinery, no matter but can comprise electrical connection, be direct or indirectly.
Figure 1 shows that the functional block diagram of light adjusting circuit 100 of the present invention.One multi-channel input is in order to connect AC power and alternating voltage is supplied to light adjusting circuit 100.In embodiment of the present invention, multi-channel input is three road inputs, comprises the first contact N, the second contact J
1with the 3rd contact J
2.This light adjusting circuit 100 comprises AC-DC change-over circuit 101, DC-ac conversion circuit 102 and load 109.Wherein DC-ac conversion circuit 102 comprises drive circuit 103, change-over circuit 105 resonant cavity 107.AC-DC change-over circuit 101 is coupled to described three road inputs, and DC-ac conversion circuit 102 is coupled between AC-DC change-over circuit 101 and load 109.Alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, and direct voltage is converted to the operating voltage of load 109 by DC-ac conversion circuit 102.This load 109 is a lamp, such as, be gaseous discharge lamp, LED, compact fluorescent lamp (CFL), also can be other lamps of the same type.Drive circuit 103 comprises variable electrical quantity generation module 111, a variable electrical quantity is provided for giving drive circuit 103, change the operating frequency of DC-ac conversion circuit 102, thus regulating the brightness of described lamp, variable electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter.
Figure 2 shows that the light adjusting circuit 100 of first embodiment of the invention.First contact N of three road inputs is in order to connect the first end (being such as one end of the neutral line) of AC power, the second contact J of described three road inputs
1with the 3rd contact J
2in order to connect second end (being such as one end of live wire) of AC power.The two-way output of AC-DC change-over circuit 101 has contact 16 and contact 18.Described light adjusting circuit 100 also comprises two in order to connect the first wire 12 and the benchmark wire 14 of AC-DC change-over circuit 101 and load 109.AC-DC change-over circuit 101 is by switch D
1, D
3, D
10, D
9, D
2, D
4the bridge rectifier formed.Switch D
1with switch D
3series connection, switch D
10with switch D
9series connection, switch D
2with switch D
4series connection, and these three series circuits are parallel between contact 16 and contact 18.Switch D
1with switch D
3between contact 15 be coupled with the first contact N.Switch D
10with switch D
9between contact 17 and the second contact J
1coupling.Switch D
2with switch D
4between contact 19 and the 3rd contact J
2coupling.These switches D
1, D
3, D
10, D
9, D
2, D
4can be the definite value such as diode, MOSFT, IGBT, half controlled or controlled switching device.In the alternative, switch D
1, D
3, D
10, D
9, D
2, D
4jointly or respectively can be removed and be replaced by a pair Ultrafast recovery diode.In other implementations, switch D
1, D
3, D
10, D
9, D
2, D
4can be integrated in a packaging part.
In the exemplary embodiment illustrated in fig. 2, due to the instability of civil power, electric capacity C can be set
17, electric capacity C
18with electric capacity C
19to reach the object of filtering.Electric capacity C
17be arranged between the first contact N and contact 16, and electric capacity C
17with switch D
1in parallel.Electric capacity C
18be arranged on the second contact J
1and between contact 18, and electric capacity C
18with switch D
9in parallel.Electric capacity C
19be arranged on the 3rd contact J
2and between contact 18, and electric capacity C
19with switch D
4in parallel.At the second contact J
1with electric capacity C
18between fuse F is set
1, at the 3rd contact J
2with electric capacity C
19between fuse F is set
2.In other implementations, described electric capacity C
17, C
18, C
19be movable to other points in circuit, such as but not limited to switch D
1, D
9, D
4deng in parallel.In other embodiments, electric capacity can not had or have more electric capacity and switch D
1, D
9, D
4etc. being connected in parallel.
In the exemplary embodiment illustrated in fig. 2, AC-DC change-over circuit 101 also comprises the inductance L for filtering
1, electric capacity C
1with electric capacity C
2.Electric capacity C
2two ends be coupled in respectively on the first wire 12 and benchmark wire 14.Electric capacity C
1two ends be coupled in respectively on the first wire 12 and benchmark wire 14, and with electric capacity C
2form a parallel circuits.Inductance L
1be positioned at electric capacity C
1with electric capacity C
2between two end points on the first wire 12.In the present embodiment, electric capacity C
2it is an electrochemical capacitor.
In the exemplary embodiment illustrated in fig. 2, drive circuit 103 is coupled to AC-DC change-over circuit 101, and is connected between the first wire 12 and benchmark wire 14.
In the exemplary embodiment illustrated in fig. 2, change-over circuit 105 comprises the first switch M be connected in series between the first wire 12 and benchmark wire 14
1with second switch M
2, the first switch M
1with second switch M
2between comprise a reference-junction 20.As the first switch M
1with second switch M
2when comprising n raceway groove and p channel enhancement MOSFET respectively, the first switch M
1with second switch M
2source electrode intersect at reference-junction 20, the first switch M
1with second switch M
2grid or drive end be coupled in control contact 22.First switch M
1grid and control to be connected with between contact 22 to drive resistance R
3.Second switch M
2grid and control to be connected with between contact 22 to drive resistance R
4.Drive circuit 103 also comprises resistance R
1with resistance R
2.Resistance R
2coupled one end to the first wire 12, the other end with drive resistance R
3intersect at and control contact 22.Resistance R
1coupled one end to benchmark wire 14, the other end is coupled to second switch M
2grid.Drive circuit 103 is at reference-junction 20 and control to provide driving voltage between contact 22.Reference-junction 20 and the driving voltage controlled between contact 22 can control the first switch M
1with second switch M
2conducting state.First switch M
1with second switch M
2other devices or semiconductor pair of possessing complementary conductive pattern can be comprised, such as PNP and NPN bipolar junction transistor.
In the exemplary embodiment illustrated in fig. 2, drive circuit 103 also comprises the 3rd bi-directional voltage clamp circuit 26 being connected to reference-junction 20 and controlling between contact 22.3rd bi-directional voltage clamp circuit 26 comprises back-to-back Zener diode D
7with Zener diode D
8.Zener diode D
7negative electrode be coupled to control contact 22, Zener diode D
8negative electrode be coupled to reference-junction 20.In other embodiments, also can be Zener diode D
7anode be coupled to control contact 22, Zener diode D
8anode be coupled to reference-junction 20.3rd bi-directional voltage clamp circuit 26 impels fundamental component and the resonant inductance T of (such as, from reference-junction 20 to benchmark wire 14) voltage in load 109
2in alternating current between phase angle at lamp V
lampzero is reached between 109 burn period.
In the exemplary embodiment illustrated in fig. 2, preferably electric capacity C is set between reference-junction 20 and control contact 22
4, to limit the rate of change of driving voltage between reference-junction 20 and control contact 22 in advance.This contributes to ensureing at the first switch M
1with second switch M
2switch during dead band time interval, wherein, two switches are closed between each switch conduction times.
In the exemplary embodiment illustrated in fig. 2, in drive circuit 103, the variable electrical quantity generation module 111 shown in Fig. 1 is capacitance modules 113.Capacitance module 113, inductance L
2with feedback inductance T
1be connected on successively and control between contact 22 and reference-junction 20.Second bi-directional voltage clamp circuit 28 is coupling in inductance L
2two ends, in order to limit inductance L
2the drift of upper generating positive and negative voltage.Second bi-directional voltage clamp circuit 28 is back-to-back Zener diode D
13with Zener diode D
14.Zener diode D
13anode be coupled to capacitance module 113 and inductance L
2middle contact.Zener diode D
14anode be coupled to inductance L
2with feedback inductance T
1middle contact.Second bi-directional voltage clamp circuit 28 and inductance L
2parallel connection, its voltage rating should fully be greater than in the control voltage controlling to carry out between contact 22 and reference-junction 20 changing, so that this bi-directional voltage clamp circuit 28 not conducting during light adjusting circuit 100 normal running.In other embodiments, also can be Zener diode D
13negative electrode be coupled to capacitance module 113 and inductance L
2middle contact, Zener diode D
14negative electrode be coupled to inductance L
2with feedback inductance T
1middle contact
In Fig. 2 and Fig. 3 illustrated embodiment, capacitance module 113 is provided with contact A and contact B, and contact A is coupled to Zener diode D
13anode, contact B be coupled to control contact 22.In other embodiments, contact A also can be coupled to Zener diode D
13negative electrode.Capacitance module 113 comprises capacitance adjustment unit 11, first control circuit 13 and second control circuit 15.Capacitance adjustment unit 11 is made up of two capacitive branch in parallel.First capacitive branch comprises the 3rd control switch M be connected in series
4with the first electric capacity C
7.First electric capacity C
7one end be connected to contact B, the other end is connected to the 3rd control switch M
4one end, the 3rd control switch M
4the other end be connected to contact A.Second capacitive branch comprises the 4th control switch M be connected in series
6with the second electric capacity C
8.Second electric capacity C
8one end be connected to contact B, the other end is connected to the 4th control switch M
6one end, the 4th control switch M
6the other end be connected to contact A.In the present embodiment, the 3rd control switch M
4with the 4th control switch M
6can be MOSFET, but be not limited to MOSFET.3rd control switch M
4by the second contact J being connected to three road inputs
1first control circuit 13 control.4th control switch M
6by the 3rd contact J being connected to three road inputs
2second control circuit 15 control.In other embodiments, capacitance module 113 can comprise plural capacitive branch and the control circuit corresponding with it.
In the embodiment shown in figure 2, first control circuit 13 comprises resistance R
6, resistance R
11, resistance R
12, the first diode D
15with electric capacity C
12.Resistance R
6, the first diode D
15with resistance R
11connect successively, wherein resistance R
6coupled one end to the second contact J of three road inputs
1, resistance R
6the other end be connected to the first diode D
15anode, the first diode D
15negative electrode be connected to resistance R
11one end, resistance R
11the other end be coupled to the 3rd control switch M
4source electrode.Resistance R
12one end be connected to the first diode D
15negative electrode, the other end is coupled to the 3rd control switch M
4grid.Electric capacity C
12one end be connected to resistance R
12with the 3rd control switch M
4contact in the middle of grid, the other end is connected to resistance R
11with the 3rd control switch M
4contact in the middle of source electrode.When the first contact N is connected to the first end of AC power, the second contact J
1when being connected to the second end of AC power, voltage signal passes through the effect of resistance and electric capacity in first control circuit 13 to the 3rd control switch M
4there is provided the control voltage (be such as 15V) identical with power turn-on sequential, wherein the first diode D
15for filtering negative voltage, when making the second contact J1 input positive voltage, the 3rd control switch M
4conducting.Also can connect comparator (not shown) in first control circuit 13 in other embodiments, make the second contact J
1when input voltage is greater than a positive threshold value, the 3rd control switch M
4conducting.
Second control circuit 15 comprises resistance R
8, resistance R
10, resistance R
13, the second diode D
16with electric capacity C
14.Resistance R
8, the second diode D
16with resistance R
10connect successively, wherein resistance R
8coupled one end to the 3rd contact J of three road inputs
2, resistance R
8the other end be connected to the second diode D
16anode, the second diode D
16negative electrode be connected to resistance R
10one end, resistance R
10the other end be coupled to the 4th control switch M
6source electrode.Resistance R
13one end be connected to the second diode D
16negative electrode, the other end is coupled to the 4th control switch M
6grid.Electric capacity C
14one end be connected to resistance R
13with the 4th control switch M
6contact in the middle of grid, the other end is connected to resistance R
10with the 4th control switch M
6contact in the middle of source electrode.When the first contact N is connected to the first end of AC power, the 3rd contact J
2when being connected to the second end of AC power, voltage signal passes through the effect of resistance and electric capacity in second control circuit 15 to the 4th control switch M
6the control voltage (be such as 15V) identical with power turn-on sequential is provided.Wherein the second diode D
16for filtering negative voltage, make the 3rd contact J
2during input positive voltage, the 4th control switch M
6conducting.
In the embodiment shown in figure 2, between contact A and contact B can the first bi-directional voltage clamp circuit 30 in parallel to protect the 3rd control switch M
4with the 4th control switch M
6.This first bi-directional voltage clamp circuit 30 is back-to-back Zener diode D
20with Zener diode D
21, wherein Zener diode D
20negative electrode be coupled to contact B, Zener diode D
21negative electrode be coupled to contact A.In other embodiments, Zener diode D
20anode be coupled to contact B, Zener diode D
21anode be coupled to contact A.
Execution mode shown in Fig. 2, resonant cavity 107 is coupled to load 109, and load 109 can be lamp V
lamp109.Resonant cavity 107 comprises resonant capacitance C
16A, resonant inductance T
2, load capacitance C
16Bwith capacitance C
9.Wherein, resonant inductance T
2one end be connected to reference-junction 20, the other end is coupled to lamp V
lampone end of 109, lamp V
lampthe other end of 109 is connected to capacitance C
9one end, capacitance C
9the other end be coupled to benchmark wire 14.Resonant capacitance C
16Awith resonant inductance T
2in order to determine lamp V
lampthe resonance frequency of 109.Resonant capacitance C
16Awith load capacitance C
16Bwith lamp V
lamp109 is in parallel.
Feedback inductance T
1with resonant inductance T
2intercouple, the polarity shown in relevant point detecting electric current can be had in load 109.By the first inductance L
2, capacitance module 113, feedback inductance T
1in feedback signal be coupling on reference-junction 20.Resistance R
1with resistance R
2in order to start the feedback operation of drive circuit 103.In this start-up course, because the excitation of DC bus-bar voltage is by resistance R
1with resistance R
2charge to capacitance module 113, the voltage on capacitance module 113 is initially zero, during start-up course, and the first inductance L
2with feedback inductance T
1low ESR charge path is provided.
The second execution mode as shown in Figure 3, resistance R in the first control circuit 13 of capacitance module 113
11two ends can shunt regulator diode D
23, wherein voltage stabilizing didoe D
23negative electrode be coupled to the first diode D
15negative electrode.Resistance R in the second control circuit 15 of capacitance module 113
10two ends can shunt regulator diode D
22, wherein voltage stabilizing didoe D
22negative electrode be coupled to the second diode D
16negative electrode, in order to input stable control voltage.
In other embodiments, first control circuit 13 and second control circuit 15 also can be other ON-OFF control circuit known by those skilled in the art, and wherein first control circuit 13 and second control circuit 15 can adopt identical or different circuit.
In the 3rd execution mode shown in Fig. 4, the variable electrical quantity generation module 111 shown in Fig. 1 is inductor modules 213.The 3rd electric capacity C3, inductor module 213 and feedback inductance T is sequentially connected in series between reference-junction 20 and control contact 22
1.Index portion identical between Fig. 4 and Fig. 2 represents identical parts, substantially omits the explanation to these parts in Fig. 4.
In the diagram, inductor module 213 is provided with contact C and contact D, and it comprises adjustment of inductance unit 21.This adjustment of inductance unit 21 is made up of two inductive branches in parallel, and the first inductive branch comprises the 3rd control switch M be connected in series
4with the second inductance L
7.Second inductive branch comprises the 4th control switch M be connected in series
6with the 3rd inductance L
8.3rd control switch M
4by being connected to the second contact J
1first control circuit 13 control, the 4th control switch M
6by being connected to the 3rd contact J
2second control circuit 15 control.
Figure 5 shows that the schematic diagram of light adjusting circuit 100 3 road of the present invention input incoming transport power supply, in this embodiment, load 109 is lamp V to composition graphs 2
lamp109.When reality uses, light adjusting circuit 100 is connected to civil power (AC power), and a multi sectional switch (in figure and not shown) can be coordinated to remove connection first contact N, the second contact J
1with the 3rd contact J
2.In embodiments, multi sectional switch such as can be four-part form, comprises closedown, low-light level, intermediate light and high brightness.
When this multi sectional switch switches to closedown, three contacts N, J of multi-channel input
1and J
2be not communicated to civil power, light adjusting circuit 100 is in off state, lamp V
lamp109 do not work.
As shown in A in Fig. 5, composition graphs 2 or Fig. 3 illustrated embodiment, when multi sectional switch switches to primary importance, the first contact N is connected to the first end of AC power, the second contact J
1be connected to the second end of AC power.The voltage that AC power exports gives the 3rd control switch M by first control circuit 13
4there is provided positive control voltage, the 3rd control switch M
4conducting.With the 3rd control switch M
4first electric capacity C of series connection
7be connected between contact A, B.Now, alternating voltage is by being converted to direct voltage after AC-DC change-over circuit 101.By DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the second contact J
1with being connected into of the first contact N, the first electric capacity C
7be coupled to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a low operating frequency, lamp V
lamp109 export a low-light level.
As shown in B in Fig. 5, composition graphs 2 or Fig. 3 illustrated embodiment, when multi sectional switch switches to the second place, the first contact N is connected to the first end of AC power, the 3rd contact J
2be connected to the second end of AC power.3rd contact J
2the voltage exported gives the 4th control switch M by second control circuit 15
6there is provided positive control voltage, the 4th control switch M
6conducting.With the 4th control switch M
6second electric capacity C of series connection
8be connected between contact A, B.Now, alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, by DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the 3rd contact J
2with being connected into of the first contact N, the second electric capacity C
8be coupled to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a medium operating frequency, lamp V
lamp109 export an intermediate light.
As shown in C in Fig. 5, composition graphs 2 or Fig. 3 illustrated embodiment, when multi sectional switch switches to the 3rd position, the first contact N is connected to the first end of AC power, the second contact J
1with the 3rd contact J
2all be connected to the second end of AC power.The voltage that AC power exports gives the 3rd control switch M by first control circuit 13
4there is provided positive control voltage, the 3rd control switch M
4conducting.The voltage that AC power exports gives the 4th control switch M by second control circuit 15
6there is provided positive control voltage, the 4th control switch M
6conducting.With the 3rd control switch M
4first electric capacity C of series connection
7and with the 4th control switch M
6second electric capacity C of series connection
8parallel connection is linked between contact A, B.Now, alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, by DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the second contact J
1, the 3rd contact J
2aC power is connected into, the first electric capacity C with while the first contact N
7with the second electric capacity C
8be coupled in parallel to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a high operate frequency, lamp V
lamp109 export a high brightness.
The input being optionally coupled to AC power by multi-channel input makes light adjusting circuit 100 be operated in different coupled mode, to change the capacitance parameter between access control contact 22 and reference-junction 20, thus change the operating frequency of DC-ac conversion circuit 102, reach and regulate lamp V
lampthe object of 109 brightness.
Please in the lump shown in composition graphs 4 and Fig. 5, in this embodiment, when this multi sectional switch switches to closedown, three contacts N, J
1and J
2be not communicated to civil power, light adjusting circuit 100 is in off state, lamp V
lamp109 do not work.
As shown in A in Fig. 5, when multi sectional switch switches to primary importance, the first contact N is connected to the first end of AC power, the second contact J
1be connected to the second end of AC power.The voltage that AC power exports gives the 3rd control switch M by first control circuit 13
4there is provided positive control voltage, the 3rd control switch M
4conducting.With the 3rd control switch M
4second inductance L of series connection
7be connected between contact C, D.Now, alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, by DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the second contact J
1with being connected into of the first contact N, the second inductance L
7be coupled to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a low operating frequency, lamp V
lamp109 outputs one are low waits brightness.
As shown in B in Fig. 5, when multi sectional switch switches to the second place, the first contact N is connected to the first end of AC power, the 3rd contact J
2be connected to the second end of AC power.The voltage that AC power exports gives the 4th control switch M by second control circuit 15
6there is provided positive control voltage, the 4th control switch M
6conducting.With the 4th control switch M
63rd inductance L of series connection
8be connected between contact C, D.Now, alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, by DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the 3rd contact J
2with being connected into of the first contact N, the 3rd inductance L
8be coupled to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a medium operating frequency, lamp V
lamp109 export brightness in one.
As shown in C in Fig. 5, when multi sectional switch switches to the 3rd position, the first contact N is connected to the first end of AC power, the second contact J
1with the 3rd contact J
2all be connected to the second end of AC power.The voltage that AC power exports gives the 3rd control switch M by first control circuit 13
4there is provided positive control voltage, the 3rd control switch M
4conducting.The voltage that AC power exports gives the 4th control switch M by second control circuit 15
6there is provided positive control voltage, the 4th control switch M
6conducting.With the 3rd control switch M
4second inductance L of series connection
7and with the 4th control switch M
63rd inductance L of series connection
8parallel connection is linked between contact C, D.Now, alternating voltage is converted to direct voltage by AC-DC change-over circuit 101, by DC-ac conversion circuit 102, direct voltage is converted into lamp V
lampthe operating voltage of 109.Therefore by the second contact J
1, the 3rd contact J
2be connected into AC power, the second inductance L with the first contact N simultaneously
7with the 3rd inductance L
8be coupled in parallel to reference-junction 20 and control between contact 22, DC-ac conversion circuit 102 produces a high operate frequency, lamp V
lamp109 export a high brightness.
The input being optionally coupled to AC power by multi-channel input makes light adjusting circuit 100 be operated in different coupled mode, to change the inductance parameters between access control contact 22 and reference-junction 20, thus change the operating frequency of DC-ac conversion circuit 102, reach and regulate lamp V
lampthe object of 109 brightness.
In other embodiments, the electrical quantity changed between reference-junction 20 and control contact 22 can also comprise feedback inductance T
1replace with a variable inductor module, or by electric capacity C
4replace with a variable capacitance module, be not limited to and change by changing coupled mode between three road inputs and AC power.
In sum, light adjusting circuit 100 of the present invention, by the first contact N, the second contact J of three road inputs
1, the 3rd contact J
2different from the annexation between power supply (civil power), namely the coupled mode of described multi-channel input is changed to the electrical quantity regulating reference-junction 20 and control between contact 22, thus change the operating frequency of DC-ac conversion circuit 102, and then corresponding adjustment lamp V
lampthe brightness of 109.Use the circuit of control IC or complexity to carry out controlling compared to prior art, the present invention uses simple electronic component to connect the object that just can reach three tunnel light modulations, reduces cost.
Although describe the present invention in conjunction with specific execution mode, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to be encompassed in all such modifications in true spirit of the present invention and scope and modification.
Claims (10)
1. a light adjusting circuit, it comprises:
One AC-DC change-over circuit, for converting an alternating voltage of AC power to a direct voltage; And
One DC-ac conversion circuit, is coupled between described AC-DC change-over circuit and a lamp, and described DC-ac conversion circuit is used for the operating voltage described direct voltage being converted to described lamp, and described DC-ac conversion circuit also comprises:
One drive circuit, for controlling to provide a driving voltage between contact at a reference-junction and one, described drive circuit comprises a variable electrical quantity generation module to provide at least one electrical quantity, and described electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter; And
One change-over circuit, is coupled to described drive circuit and comprises at least one switch, and the conducting state of described at least one switch determined by the driving voltage of described drive circuit;
By regulating the described at least one electrical quantity between described reference-junction and described control contact, change the operating frequency of described DC-ac conversion circuit, thus regulate the brightness of described lamp.
2. light adjusting circuit as claimed in claim 1, it is characterized in that, one multi-channel input, be coupled between described AC power and described AC-DC change-over circuit, for receiving the alternating voltage of described AC power, the input that described multi-channel input is optionally coupled to described AC power makes light adjusting circuit be operated in different coupled mode.
3. light adjusting circuit as claimed in claim 2, it is characterized in that, described variable electrical quantity generation module is a capacitance module, described capacitance module is coupled to described reference-junction and controls between contact for providing described capacitance parameter, described capacitance module is also coupled to described multi-channel input, and the coupled mode of described multi-channel input determines the described capacitance parameter of described capacitance module.
4. light adjusting circuit as claimed in claim 3, it is characterized in that, described capacitance module also comprises:
Multiple control circuit, is coupled to described multi-channel input; And
Multiple capacitive branch, be coupled in parallel to described reference-junction and control between contact, each described capacitive branch correspondence is coupled to described control circuit, each described capacitive branch comprises a control switch and an electric capacity, and the coupled mode of described multi-channel input determines the conducting state of control switch described in described capacitive branch.
5. light adjusting circuit as claimed in claim 2, it is characterized in that, described variable electrical quantity generation module is an inductor module, described inductor module is coupled to described reference-junction and controls between contact for providing described inductance parameters, described inductor module is also coupled to described multi-channel input, and the coupled mode of described multi-channel input determines the described inductance parameters of described inductor module.
6. light adjusting circuit as claimed in claim 5, it is characterized in that, described inductor module also comprises
Multiple control circuit, is coupled to described multi-channel input; And
Multiple inductive branch, be coupled in parallel to described reference-junction and control between contact, each described inductive branch correspondence is coupled to described control circuit, each described inductive branch comprises a control switch and an inductance, and the coupled mode of described multi-channel input determines the conducting state of control switch described in described inductive branch.
7. light adjusting circuit as claimed in claim 1, it is characterized in that, described DC-ac conversion circuit also comprises the resonant cavity being coupled to described lamp.
8. light adjusting circuit as claimed in claim 1, it is characterized in that, described at least one switch comprises the semiconductor pair be connected in series, described reference-junction be described semiconductor right one connect contact, described control contact by a resistively couple to the right drive end of each described semiconductor.
9. a light-dimming method, for regulating the brightness of a lamp, it comprises:
The alternating voltage of an AC power is converted to a direct voltage by an AC-DC change-over circuit;
By a DC-ac conversion circuit, described direct voltage is converted to an operating voltage of described lamp; And
By the brightness regulating an operating frequency of described DC-ac conversion circuit to regulate described lamp, described operating frequency is regulated specifically to comprise:
Determine that a reference-junction and of described DC-ac conversion circuit controls contact, the voltage between described reference-junction and described control contact determines the conducting state of at least one switch in DC-ac conversion circuit; And
By the operating frequency regulating at least one electrical quantity between described reference-junction and described control contact to regulate described DC-ac conversion circuit, described electrical quantity is at least one parameter selected from an inductance parameters and a capacitance parameter.
10. light-dimming method as claimed in claim 9, is characterized in that, regulate described at least one electrical quantity specifically to comprise
An alternating voltage is received by a multi-channel input;
The input being optionally coupled to described AC power by described multi-channel input makes to apply the circuit working of described light-dimming method in different coupled mode; And
Change the coupled mode of described multi-channel input to regulate at least one electrical quantity between described reference-junction and described control contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671347.4A CN104703372A (en) | 2013-12-10 | 2013-12-10 | Dimming circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671347.4A CN104703372A (en) | 2013-12-10 | 2013-12-10 | Dimming circuit and method |
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| Publication Number | Publication Date |
|---|---|
| CN104703372A true CN104703372A (en) | 2015-06-10 |
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ID=53350030
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310671347.4A Pending CN104703372A (en) | 2013-12-10 | 2013-12-10 | Dimming circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688662A (en) * | 2019-01-02 | 2019-04-26 | 中冶南方工程技术有限公司 | A kind of landscape brightening intelligent regulating device and method |
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| US20100302821A1 (en) * | 2009-05-27 | 2010-12-02 | Osram Sylvania Inc. | Operating Resonant Load Circuit, Dimming Circuit and Dimming Method |
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| CN2096197U (en) * | 1991-07-10 | 1992-02-12 | 霍俊 | Section light regulating electronic fluorescent lamp |
| US20040113564A1 (en) * | 2002-12-11 | 2004-06-17 | Glaser John Stanley | Dimmable self-oscillating electronic ballast for fluorescent lamp |
| CN2859993Y (en) * | 2005-12-26 | 2007-01-17 | 福州永德吉照明电器有限公司 | Three-step dimming fluorescent lamp |
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Application publication date: 20150610 |