CN204465928U - Be applicable to the light adjusting circuit on controllable silicon dimmer circuit and light adjusting system - Google Patents
Be applicable to the light adjusting circuit on controllable silicon dimmer circuit and light adjusting system Download PDFInfo
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- CN204465928U CN204465928U CN201420870798.0U CN201420870798U CN204465928U CN 204465928 U CN204465928 U CN 204465928U CN 201420870798 U CN201420870798 U CN 201420870798U CN 204465928 U CN204465928 U CN 204465928U
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Abstract
The utility model provides a kind of and is applicable to light adjusting circuit on controllable silicon dimmer circuit and light adjusting system, by the current sample end of circuit of power factor correction connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by input signal, sine voltage signal is converted by input signal, and bias current and input signal positive correlation.Thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensures that the operating state of thyristor operating angle is normal and stable, avoiding the stroboscopic problem of LED, improve the dimming effect to LED.
Description
Technical field
The utility model relates to a kind of technical field of LED illumination, particularly relates to a kind ofly to be applicable to light adjusting circuit on controllable silicon dimmer circuit and light adjusting system.
Background technology
The solid-state semiconductor device of LED (Light Emitting Diode, light-emitting diode) to be a kind of can be by electric energy conversion visible ray, it directly can be converted into light electricity.LED due to have energy-saving and environmental protection, can the lot of advantages such as light-operated, practical, stability is high, the response time is short, long-life, be widely used in various lighting field in the today of advocating low-carbon (LC) life.
Existing based on controllable silicon dimmer in the technology of LED light modulation, the output of controllable silicon dimmer is connected with rectification circuit, rectification circuit output end is connected to busbar voltage, one end of transformer primary side is connected to busbar voltage, the other end is connected to the current sample pin of integrated circuit (integrated circuit, IC) by resistance; Upper input d. c. voltage signal of current sample pin (CS) of integrated circuit, integrated circuit is for realizing the correction of the power factor to transformer primary side, by the size of the d. c. voltage signal of adjustment CS end, change the primary current peak value size of the transformer connected in this circuit, thus realize controllable silicon dimmer light modulation is carried out to LED.
But; when position, busbar voltage the lowest point; the threshold value that switching tube turns off can become that very little (this is owing to turning off threshold value in circuit of power factor correction and busbar voltage is proportional; busbar voltage is close to zero; turn off threshold value also close to zero); at this moment fixing on current sample pin DC voltage bias amount usually can be greater than this and turn off threshold value; thus integrated circuit is forced to quit work during causing; and then result through silicon controlled latching current and maintain electric current be not connected; controllable silicon turns off in advance, thus LED there will be serious stroboscopic.
Utility model content
The utility model provides a kind of and is applicable to light adjusting circuit on controllable silicon dimmer circuit and light adjusting system, in order to solve the stroboscopic problem that controllable silicon dimmer control LED etc. occurs.
On the one hand, the utility model provides a kind of light adjusting circuit be applicable on controllable silicon dimmer circuit, it is characterized in that, comprising:
Signaling conversion circuit, circuit of power factor correction;
Described signaling conversion circuit, for input signal is converted to sine voltage signal, and exports the current sample end of described circuit of power factor correction to;
Described circuit of power factor correction, for receiving described sine voltage signal from described current sample termination and realizing power factor correction, the sine-wave current signal that described sine voltage signal is corresponding is the primary current sum of transformer in bias current and described circuit of power factor correction;
Wherein, described bias current is controlled to produce by described input signal, and this bias current value and described input signal values positive correlation.
Further, light adjusting circuit as above, described signaling conversion circuit comprises:
One triode, the base stage of triode described in this is connected with described input signal by a resistance (R3), and the base stage of this triode is by a resistance (R4) ground connection; The transmitting collection of described triode is by resistance (R5) ground connection; The collector electrode of described triode is connected with the current sample end of described circuit of power factor correction by resistance (R7), and the collector electrode of this triode is connected to busbar voltage by resistance (R1).
Further, light adjusting circuit as above, described input signal is d. c. voltage signal or is pulse width modulation (PWM) signal.
Further, light adjusting circuit as above, if described input signal is described d. c. voltage signal, then also comprises in described signaling conversion circuit: the direct voltage source be connected with the base stage of described triode; Or,
If described input signal is described pwm signal, then described signaling conversion circuit also comprises: pwm signal source and electric capacity; Described pwm signal source is connected with the positive pole of described resistance (R3) and described electric capacity by a resistance (R8); The minus earth of described electric capacity.
Further, light adjusting circuit as above, described circuit of power factor correction also comprises: integrated circuit (IC), and the CS pin of described IC is described current sample end, and described IC also comprises supply power voltage pin and ground pin; One end (C) of described transformer primary side is connected to described busbar voltage, and the other end (D) is connected to described CS pin by resistance (R2) and by resistance (R6) ground connection.
Further, light adjusting circuit as above, described integrated circuit also comprises the GATE pin as output control terminal, described circuit of power factor correction also comprises: switching tube, and described switching tube is connected with the other end (D) of described transformer primary side, resistance (R6), resistance (R2) and described GATE pin respectively.
Further, light adjusting circuit as above, described switching tube is triode, then the base stage of this triode is connected with described GATE pin, collector electrode is connected with the other end (D) of described transformer primary side, launches collection and is connected between resistance (R2) and resistance (R6); Or,
Described switching tube is mos field effect transistor metal-oxide-semiconductor, then the grid of this metal-oxide-semiconductor is connected with described GATE pin, drain electrode is connected with the other end (D) of described transformer primary side, and source electrode is connected between resistance (R2) and resistance (R6).
On the other hand, the utility model also provides a kind of light adjusting system, it is characterized in that, comprises light adjusting circuit as above, power supply, controllable silicon dimmer and LED load;
The output of power supply is connected with controllable silicon dimmer, and controllable silicon dimmer is connected with described light adjusting circuit, and the secondary of the transformer in light adjusting circuit is connected with LED load.
What the utility model provided is a kind ofly applicable to light adjusting circuit on controllable silicon dimmer circuit and light adjusting system, by the current sample end of circuit of power factor correction connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by input signal, sine voltage signal is converted by input signal, and bias current and input signal positive correlation.Thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensures that the operating state of thyristor operating angle is normal and stable, avoiding the stroboscopic problem of LED, improve the dimming effect to LED.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The circuit diagram being applicable to another embodiment of light adjusting circuit on controllable silicon dimmer circuit that Fig. 1 provides for the utility model;
The circuit diagram being applicable to another embodiment of light adjusting circuit on controllable silicon dimmer circuit that Fig. 2 provides for the utility model;
The structural representation of an embodiment of a kind of light adjusting system that Fig. 3 provides for the utility model.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In light adjusting circuit embodiment being applicable on controllable silicon dimmer circuit that the utility model provides, this light adjusting circuit comprises: signaling conversion circuit, circuit of power factor correction;
Signaling conversion circuit, for input signal is converted to sine voltage signal, and exports the current sample end of circuit of power factor correction to;
Circuit of power factor correction, for receiving described sine voltage signal from current sample termination and realizing power factor correction, the sine-wave current signal that sine voltage signal is corresponding is the primary current sum of transformer in bias current and circuit of power factor correction;
Wherein, bias current is controlled to produce by input signal, and this bias current value and input signal values positive correlation.
Wherein, input signal can be direct current signal, also can be various types of signals such as pulse width modulation (Pulse WidthModulation, PWM) signal, and signaling conversion circuit is used for input signal to be converted to sine voltage signal.Be understandable that, for different input signals, signaling conversion circuit can have different circuit structures, and signaling conversion circuit also can adopt existing various types of circuit structure, only guarantees input signal to be converted to sine voltage signal.
Circuit of power factor correction, for receiving sine voltage signal realize capability correction, to improve the power factor value of this signal as much as possible to from current sample termination.It should be noted that, this circuit of power factor correction can be existing various types of LED drive integrated circult, such as: with the type such as constant-current LED drive integrated circult of active power factor correction (Active Power Factor Correction, APFC).Such circuit of power factor correction can realize Active Power Factor Correction, can export constant electric current for LED load.
Due to the primary current sum that sine-wave current signal that sine voltage signal is corresponding is bias current and transformer, and bias current is controlled to produce by input signal, and this bias current value and input signal values positive correlation, therefore, the current peak on the former limit of transformer can be changed by the size adjusting input signal, thus realize LED light modulation.In prior art; add in the current sample endlap of circuit of power factor correction and be generally DC biased level; the shutoff threshold value of this circuit of power factor correction when busbar voltage trough can be less than the DC biased level of superposition usually, thus circuit of power factor correction may be caused to be forced to quit work.In the utility model, the envelope of the sine voltage signal of the current sample end input of circuit of power factor correction is consistent with the envelope of busbar voltage, when in busbar voltage wave trough position, the sine voltage signal also vanishing of current sample end input, the normal operating conditions of circuit can not be interfered with, make circuit of power factor correction continuous operation, thus ensure that the operating state of thyristor operating angle is normal and stable, avoid the stroboscopic problem of LED, improve the dimming effect to LED.
The light adjusting circuit that what the present embodiment provided be applicable on controllable silicon dimmer circuit, by the current sample end of circuit of power factor correction connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by input signal, sine voltage signal is converted by input signal, and bias current and input signal positive correlation.Thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensures that the operating state of thyristor operating angle is normal and stable, avoiding the stroboscopic problem of LED, improve the dimming effect to LED.
The circuit diagram being applicable to another embodiment of light adjusting circuit on controllable silicon dimmer circuit that Fig. 1 provides for the utility model, as shown in Figure 1, provide the concrete enforcement scene that input signal is d. c. voltage signal in the present embodiment, in the preferred embodiment, signaling conversion circuit comprises:
The base stage of one triode Q1, this triode Q1 is connected with d. c. voltage signal Vbias by a resistance (R3), and the base stage of this triode is by a resistance (R4) ground connection; The transmitting collection of triode is by resistance (R5) ground connection; The collector electrode of triode is connected with the current sample end CS of circuit of power factor correction by resistance (R7), and the collector electrode of this triode is connected to busbar voltage by resistance (R1).
Wherein, Vbias is direct voltage source.In the present embodiment, circuit of power factor correction also comprises integrated circuit (IC), and the CS pin of integrated circuit (IC) is current sample end, and integrated circuit also comprises supply power voltage pin and grounding pin.One end (C) of transformer primary side is connected to busbar voltage Vbus, and the other end (D) is connected to the CS pin of IC by resistance (R2), and by resistance (R6) ground connection.
Concrete, the A point voltage due in Fig. 1:
Va＝(1+β)×ib×R5+Vbe， (1)
Arrange can obtain according to (1) and (2):
That is:
Wherein, β is the current amplification factor of triode (Q1), and ib is the base current of triode (Q1), and Vbe is emitter junction voltage, and Ic is bias current.
Due to
for definite value, and Vbe is relevant with selected device, depends on the device attribute of triode, is therefore also definite value.
Ib and Vbias positive correlation can be learnt by formula (3), thus Vbias-ib × R3 and Vbias positive correlation.Again due to primary current sum that sine-wave current signal that the sine voltage signal of the current sample end of circuit of power factor correction is corresponding is bias current and transformer, therefore, bias current Ic and d. c. voltage signal Vbias positive correlation, described bias current Ic can be controlled by described d. c. voltage signal Vbias, by adjusting the size of described d. c. voltage signal Vbias, the current peak on transformer (T1) former limit can be changed, thus realize LED light modulation.
Further, the GATE pin of integrated circuit (IC) is as output control terminal, circuit of power factor correction can also be connected to the former limit other end (D) of transformer (T1) further by a switching tube (Q2), and switching tube (Q2) resistance (R2) is connected to the current sample end of circuit of power factor correction, i.e. the CS pin of integrated circuit (IC).Switching tube (Q2) is by a resistance (R6) ground connection.Circuit of power factor correction can carry out control switch pipe (Q2) whether conducting by exporting different values to switching tube (Q2).
Wherein, switching tube (Q2) can be triode, also can be mos field effect transistor metal-oxide-semiconductor; If switching tube is triode, then this triode base stage with output control terminal be connected, collector electrode is connected with the other end (D) of transformer primary side, launch collection be connected between resistance (R2) and resistance (R6); If switching tube is mos field effect transistor (Metal Oxid Semiconductor, MOS) manage, then the grid of this metal-oxide-semiconductor is connected with output control terminal, drain electrode is connected with the other end (D) of transformer primary side, and source electrode is connected between resistance (R2) and resistance (R6).
The light adjusting circuit that what the present embodiment provided be applicable on controllable silicon dimmer circuit, by the current sample end CS pin of integrated circuit (IC) connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by d. c. voltage signal, sine voltage signal is converted by d. c. voltage signal, and bias current and d. c. voltage signal positive correlation.Thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensures that the operating state of thyristor operating angle is normal and stable, avoiding the stroboscopic problem of LED, improve the dimming effect to LED.
The circuit diagram being applicable to another embodiment of light adjusting circuit on controllable silicon dimmer circuit that Fig. 2 provides for the utility model, as shown in Figure 2, the concrete enforcement scene that input signal is pwm signal is provided in the present embodiment, be with difference embodiment illustrated in fig. 1, in Fig. 1, input signal is d. c. voltage signal, in the present embodiment, input signal is pwm signal, in order to the enforcement scene of compatible PWM light modulation.
In this embodiment, the base stage of triode (Q1) no longer connects d. c. voltage signal, but pwm signal source is connected with the positive pole of resistance (R3) and electric capacity by a resistance (R8); The minus earth of electric capacity.The connected mode of miscellaneous part with embodiment illustrated in fig. 1 in all identical.
Pwm signal exports a direct current signal to R3 after resistance R8 and electric capacity C1 filtering, and it realizes effect and embodiment illustrated in fig. 1 similar.Specific implementation principle and circuit connecting mode all can associated description in embodiment shown in Figure 1, do not repeating at this.
The light adjusting circuit that what the present embodiment provided be applicable on controllable silicon dimmer circuit, by the current sample end CS pin of integrated circuit (IC) connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by d. c. voltage signal, sine voltage signal is converted by d. c. voltage signal, and bias current and d. c. voltage signal positive correlation.This d. c. voltage signal is obtained after resistance and capacitor filtering by pwm signal, thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensure that the operating state of thyristor operating angle is normal and stable, avoid the stroboscopic problem of LED, improve the dimming effect to LED, and the compatibility enforcement scene of PWM light modulation.
The structural representation of an embodiment of a kind of light adjusting system that Fig. 3 provides for the utility model, as shown in Figure 3, this system comprises: light adjusting circuit 2 as above, power supply 1, controllable silicon dimmer 3 and LED load 4;
The output of power supply 1 is connected with controllable silicon dimmer 3, and controllable silicon dimmer 3 is connected with described light adjusting circuit 2, and the secondary of the transformer in light adjusting circuit is connected with LED load 4.
The light adjusting system that the present embodiment provides, by the current sample end of the circuit of power factor correction in light adjusting circuit connects a sine voltage signal, this sine voltage signal is the primary current sum of a bias current and transformer, and bias current is controlled to produce by input signal, sine voltage signal is converted by input signal, and bias current and input signal positive correlation.Thus this light adjusting circuit is when coordinating controllable silicon dimmer to use, ensures that the operating state of thyristor operating angle is normal and stable, avoiding the stroboscopic problem of LED, improve the dimming effect to LED.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (8)
1. for a light adjusting circuit for controllable silicon dimmer, it is characterized in that, comprising:
Signaling conversion circuit, circuit of power factor correction;
Described signaling conversion circuit, for input signal is converted to sine voltage signal, and exports the current sample end of described circuit of power factor correction to;
Described circuit of power factor correction, for receiving described sine voltage signal from described current sample termination and realizing power factor correction, the sine-wave current signal that described sine voltage signal is corresponding is the primary current sum of transformer in bias current and described circuit of power factor correction;
Wherein, described bias current is controlled to produce by described input signal, and this bias current value and described input signal values positive correlation.
2. light adjusting circuit according to claim 1, is characterized in that, described signaling conversion circuit comprises:
One triode, the base stage of triode described in this is connected with described input signal by a resistance R3, and the base stage of this triode is by a resistance R4 ground connection; The transmitting collection of described triode is by resistance R5 ground connection; The collector electrode of described triode is connected with the current sample end of described circuit of power factor correction by resistance R7, and the collector electrode of this triode is connected to busbar voltage by resistance R1.
3. light adjusting circuit according to claim 2, is characterized in that, described input signal is d. c. voltage signal or is pulse width modulation (PWM) signal.
4. light adjusting circuit according to claim 3, is characterized in that, if described input signal is described d. c. voltage signal, then also comprises in described signaling conversion circuit: the direct voltage source be connected with the base stage of described triode; Or,
If described input signal is described pwm signal, then described signaling conversion circuit also comprises: pwm signal source and electric capacity; Described pwm signal source is connected with the positive pole of described resistance R3 and described electric capacity by a resistance R8; The minus earth of described electric capacity.
5. the light adjusting circuit according to any one of claim 2-4, is characterized in that, described circuit of power factor correction also comprises: integrated circuit (IC), and the CS pin of described IC is described current sample end, and described IC also comprises supply power voltage pin and ground pin; One end (C) of described transformer primary side is connected to described busbar voltage, and the other end (D) is connected to described CS pin by resistance R2 and by resistance R6 ground connection.
6. light adjusting circuit according to claim 5, it is characterized in that, described integrated circuit also comprises the GATE pin as output control terminal, described circuit of power factor correction also comprises: switching tube, and described switching tube is connected with the other end (D) of described transformer primary side, resistance R6, resistance R2 and described GATE pin respectively.
7. light adjusting circuit according to claim 6, it is characterized in that, described switching tube is triode, then the base stage of this triode is connected with described GATE pin, collector electrode is connected with the other end (D) of described transformer primary side, launches collection and is connected between resistance R2 and resistance R6; Or,
Described switching tube is mos field effect transistor metal-oxide-semiconductor, then the grid of this metal-oxide-semiconductor is connected with described GATE pin, and drain electrode is connected with the other end (D) of described transformer primary side, and source electrode is connected between resistance R2 and resistance R6.
8. a light adjusting system, is characterized in that, comprises the light adjusting circuit as described in any one of claim 1-7, power supply, controllable silicon dimmer and LED load;
The output of power supply is connected with controllable silicon dimmer, and controllable silicon dimmer is connected with described light adjusting circuit, and the secondary of the transformer in light adjusting circuit is connected with LED load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420870798.0U CN204465928U (en) | 2014-12-31 | 2014-12-31 | Be applicable to the light adjusting circuit on controllable silicon dimmer circuit and light adjusting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420870798.0U CN204465928U (en) | 2014-12-31 | 2014-12-31 | Be applicable to the light adjusting circuit on controllable silicon dimmer circuit and light adjusting system |
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| CN204465928U true CN204465928U (en) | 2015-07-08 |
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| CN201420870798.0U Withdrawn - After Issue CN204465928U (en) | 2014-12-31 | 2014-12-31 | Be applicable to the light adjusting circuit on controllable silicon dimmer circuit and light adjusting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540292A (en) * | 2014-12-31 | 2015-04-22 | 生迪光电科技股份有限公司 | Dimming circuit applicable to silicon-controlled light regulator circuit and dimming system |
-
2014
- 2014-12-31 CN CN201420870798.0U patent/CN204465928U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540292A (en) * | 2014-12-31 | 2015-04-22 | 生迪光电科技股份有限公司 | Dimming circuit applicable to silicon-controlled light regulator circuit and dimming system |
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Granted publication date: 20150708 Effective date of abandoning: 20170922 |
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