CN205305183U - LED driver control circuit , LED driver and LED lighting system - Google Patents
LED driver control circuit , LED driver and LED lighting system Download PDFInfo
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- CN205305183U CN205305183U CN201520865038.5U CN201520865038U CN205305183U CN 205305183 U CN205305183 U CN 205305183U CN 201520865038 U CN201520865038 U CN 201520865038U CN 205305183 U CN205305183 U CN 205305183U
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Abstract
The utility model provides a LED driver control circuit, LED driver and LED lighting system, LED driver control circuit includes: control circuit, judgement circuit and conditioning signal generating circuit, control circuit is arranged in the sampled signal who gathers the output of the main circuit by the LED driver to to contrast with base mark signal, exports the control signal who matches with the comparative result, and the output signal of control main circuit is the setting value, judge that the circuit is used for output power failure signal when main circuit input end falls the electricity, conditioning signal generating circuit is used for when acquireing power failure signal, and to control circuit's input output conditioning signal, conditioning signal is through superposeing with sampled signal or base mark signal for the size that is less than the setting value before not adjusting of setting value after the primary regulation. Consequently, in the system behind the electricity, the instantaneous output of main circuit reduces, and for prior art, it is right to have reduced the damage of LED lamp has prolonged the life of LED lamp.
Description
Technical field
The application relates to electronic circuit technology field, more particularly, it relates to a kind of LED driver control circuit, LED driver and LED illumination System.
Background technology
At present, LED is widely used in lighting field, generally adopts direct current supply mode due to LED, therefore, usual each LED is configured with one for realizing the LED driver of power source conversion function, and described LED driver for being converted to unidirectional current supply LED by the line voltage of input.
Referring to Fig. 1, described LED driver includes main circuit 10 and control circuit 20, described main circuit 10 is for being converted to DC supply input to LED by input power Vin, described control circuit 20 is for detecting and the output signal of telecommunication of described main circuit 10 of sampling, and by the signal of telecommunication that obtains of sampling with a reference signal compares and under other control circuit effect of inside, what output and comparative result matched controls signal to described main circuit 10, so that the output signal of telecommunication of described main circuit 10 is preset value constitutes closed-loop control system.
If fruit, when described LED driver repeat switch machine at short notice, owing to the auxiliary electric power supply Vcc of described control circuit 20 also has little time power-off, therefore, after described LED driver repeats to power on, the sampled signal of described control circuit 20 is zero, through comparing with reference signal and make control system be in degree of depth open loop situations under the effect of control circuit 20; Described control circuit 20 can export for controlling the instantaneous control signal with maximum power output of described main circuit 10, there is overshoot in the output electric current that can cause described main circuit 10, so that the life-span of described LED is impaired, What is more, directly burns described LED.
Utility model content
In view of this, the application provides a kind of LED driver control circuit, LED driver and LED illumination System, for solving in prior art after described LED driver repeats to power on, the sampled signal of described control circuit is zero, control system is in degree of depth open loop situations, described main circuit 10 is instantaneous with maximum power output, causes that overshoot occurs in the output electric current of described main circuit so that the problem that life-span of described LED is impaired.
To achieve these goals, it is proposed that scheme as follows:
A kind of LED driver control circuit, is applied in LED driver, is provided with transformator in the main circuit of described LED driver, including:
Control circuit, decision circuitry and adjustment signal generating circuit;
The first input end of described control circuit is connected with the sampling end of described main circuit, the second end is used for obtaining reference signal, described control circuit is for contrasting the sampled signal collected by described first input end and described reference signal, the control signal that output matches with comparative result, with control described main circuit output signal for setting value;
The input of described decision circuitry is connected with the vice-side winding of described transformator, for judging the input whether power down of described main circuit, if it is, output power-off signal;
The input of described adjustment signal generating circuit is connected with the outfan of described decision circuitry, outfan is connected with the input of described control circuit, when getting described power-off signal, described adjustment signal generating circuit is used for the input output regulation signal to described control circuit, described adjustment signal is by superposing with described sampled signal or reference signal so that the size less than the setting value before not regulating of the described setting value after first adjustment.
Preferably, in above-mentioned LED driver control circuit, when getting described power-off signal, described adjustment signal generating circuit is for pressing, to the output of described control circuit, the adjustment signal presetting slope gradual change, described adjustment signal is by superposing with described sampled signal or reference signal, described setting value after regulating is gradually increased to the setting value before not regulating by 0, and wherein, the described setting value after described preliminary adjustment is 0.
Preferably, in above-mentioned LED driver control circuit, the outfan of described adjustment signal generating circuit is connected with the first input end of described control circuit, when getting described power-off signal, for export one identical with described reference signal and by a fixed slope to 0 close adjustment signal, wherein, the described setting value after described preliminary adjustment is 0.
Preferably, in above-mentioned LED driver control circuit, the outfan of described adjustment signal generating circuit is connected with the second input of described control circuit, when getting described power-off signal, for export one contrary with described reference signal and by a fixed slope to 0 close adjustment signal, wherein, the described setting value after described preliminary adjustment is 0.
Preferably, in above-mentioned LED driver control circuit, described decision circuitry includes:
Comparator, for the voltage signal on described vice-side winding and predetermined level signal being compared, when the voltage signal on described vice-side winding is less than described predetermined level signal, to the triggering signal that timer output is lasting;
Timer, for starting timing after getting described lasting triggering signal, exports power-off signal when timing time exceedes preset value.
Preferably, in above-mentioned LED driver control circuit, described vice-side winding is secondary main winding or secondary auxiliary winding.
Preferably, in above-mentioned LED driver control circuit, described sampled signal is level signal, current signal or power signal.
A kind of LED driver, including LED driver control circuit disclosed in main circuit and above-mentioned any one.
A kind of LED illumination System, above-mentioned LED driver and the LED illumination lamp being connected with described LED driver.
Can be seen that from above-mentioned technical scheme, when applying LED driver control circuit disclosed in the above embodiments of the present application and described LED driver being carried out closed loop adjustment, when there is power-down conditions in the input described main circuit being detected, described adjustment signal generating circuit is to the input output regulation signal of described control circuit, the instantaneous output making described main circuit reduces, in terms of existing technologies, reduce the damage to described LED, extend the service life of described LED.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the electrical block diagram of a kind of LED driver disclosed in prior art;
The structural representation of a kind of LED driver control circuit that Fig. 2 provides for the embodiment of the present application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
It is directed in prior art when LED driver repeats to power on, control system is in degree of depth open loop situations, easily there is overshoot in the output electric current of described main circuit, DC voltage that LED obtains and electric current is made far to surpass its rated value, therefore can make the problem that the life-span of described LED is impaired, this application discloses a kind of new LED driver control circuit.
Referring to Fig. 2, LED driver control circuit disclosed in the present application, it is applied in LED driver, the main circuit 10 of described LED driver is provided with transformator T, described LED driver control circuit includes:
Control circuit 20, decision circuitry 30 and adjustment signal generating circuit 40;
Wherein, the first input end of described control circuit 20 is connected with the sampling end of described main circuit 10, the second end is used for obtaining reference signal Vr, described control circuit 20 is for contrasting the sampled signal Vs collected by described first input end and described reference signal Vr, the control signal that output matches with comparative result, with control described main circuit 10 output signal for setting value;
Wherein, described setting value is the output current value of the described main circuit 10 desired by described LED driver, it is together decided on by the oversampling ratio K and described reference signal Vr of described sampled signal Vs, namely the amplitude of the setting value of the output electric current of described main circuit 10 is equal to Vr/K, as obtained sampled signal Vs by sampling resistor Rs, then the voltage signal on Rs is described sampled signal Vs, current signal on Rs is Vs/R, described R is the resistance size of resistance Rs, therefore oversampling ratio K=R now;
The input of described decision circuitry 30 is connected with the vice-side winding of described transformator T, for judging the input whether power down of described main circuit 10, if it is, output power-off signal is to described adjustment signal generating circuit 40;
The input of described adjustment signal generating circuit 40 is connected with the outfan of described decision circuitry 30, outfan and the input of described control circuit 20 first input end or second input of described control circuit 20 (the described input here refer to) are connected, for when getting described power-off signal, to the input output regulation signal Vc of described control circuit 20, described adjustment signal Vc is by superposing with described sampled signal Vs or reference signal Vr so that the size less than the setting value before not regulating of the described setting value after first adjustment.
Wherein, after being superposed with described sampled signal Vs by described adjustment signal Vc, entirety compares as sampled signal with described reference signal Vr, time its equivalent deduct on the basis at described reference signal Vr adjustment signal Vc, reference signal Vr and described sampled signal Vs after deducting Vc is compared, to obtain sampled signal Vs by sampling resistor Rs, now the setting value of the output circuit of described main circuit 10 is (Vr-Vc)/K=(Vr-Vc)/R, described R is the resistance of described sampling resistor RS; After being superposed with described reference signal Vr by described adjustment signal Vc, entirety compares as reference signal with described sampled signal Vs, it should be pointed out that now described Vc can represent positive voltage; To obtain sampled signal Vs by sampling resistor Rs, now the setting value of the output circuit of described main circuit 10 is (Vr+Vc)/K=(Vr+Vc)/R, it should be pointed out that now described Vc can represent negative voltage. It is understood that user is by reasonably setting the size of described adjustment signal Vc, setting value (the Vr-Vc)/R after adjusting and (Vr+Vc)/R can be made less than the described setting value Vr/R before not regulating.
When applying technical scheme disclosed in the above embodiments of the present application and described LED driver being carried out closed loop adjustment, when there is power-down conditions in the input described main circuit 10 being detected, described adjustment signal generating circuit 40 is to the input output regulation signal of described control circuit 20, the instantaneous output making described main circuit 10 reduces, in terms of existing technologies, reduce the damage to described LED, extend the service life of described LED.
It is understandable that, instantaneous output for preventing described main circuit 10 is too high, the problem of output current overshoot, the setting value after described adjustment in the above embodiments of the present application can be a gradual change value, in order to greatest extent described LED be protected, in the above embodiments of the present application, can by reasonably the size of described adjustment signal being set, it is 0 that described setting value after described preliminary adjustment be can set that, described setting value is by the setting value before 0 increase most adjustment. concrete, when the outfan of described adjustment signal generating circuit 40 is connected with the first input end of described control circuit 20, when getting described power-off signal, described adjustment signal generating circuit 40 for export one identical with described reference signal Vr and by a fixed slope to 0 close adjustment signal Vc, wherein, described setting value after described preliminary adjustment is 0, namely the initial value of described adjustment signal Vc is identical with the value of described reference signal Vr, and described adjustment signal Vc presets slope by one and progressively becomes 0, i.e. described setting value (Vr-Vc)/R=(Vr-Vr)/R=0 after now preliminary adjustment, described setting value is incrementally increased to the setting value before not regulating by 0.When the outfan of described adjustment signal generating circuit 40 is connected with the second input of described control circuit 20, when getting described power-off signal, described adjustment signal generating circuit 40 for export one contrary with described reference signal Vr and by a fixed slope to 0 close adjustment signal, wherein, described setting value after described preliminary adjustment is 0, the initial value of described adjustment signal Vc counts with the value of described reference signal Vr is counter each other, i.e. described setting value (Vr+Vc)/R=(Vr-Vr)/R=0 after now preliminary adjustment.
Referring to technical scheme disclosed in the above embodiments of the present application, when applying above-mentioned LED driver control circuit, when the input power down of main circuit 10, power-off signal is exported to regulating signal generating circuit 40 by described decision circuitry 30, described adjustment signal generating circuit 40 controls described control circuit makes its setting value set to 0, so after the input of described main circuit 10 re-powers, simultaneously because the setting value of described adjustment signal generating circuit 40 begins to ramp up from 0, even if therefore now the accessory power supply of described adjustment signal generating circuit 40 has little time power down, loop is without being in degree of depth open loop situations, namely it is too high to avoid described main circuit 10 instantaneous output, output current overshoot problem.
Wherein, the gradual slope of described adjustment signal can according to user's request sets itself.
It is understandable that, in the prior art, voltage signal on the vice-side winding of described main circuit 10 is generally square-wave signal, therefore, in order to ensure the properly functioning of described LED driver, voltage on described vice-side winding when being 0 or low level described main circuit 10 be likely to and run on normal operating conditions, therefore described decision circuitry 30 just cannot export power-off signal immediately when the voltage detected on described vice-side winding is 0 or low level. It is directed to this, disclosed in the above embodiments of the present application, described decision circuitry 30 may include that comparator and timer, described comparator, for the voltage signal on described vice-side winding and predetermined level signal are compared, when the voltage signal on described vice-side winding is less than described predetermined level signal, the voltage signal shown on now described vice-side winding is 0 or low level, to the triggering signal that the output of described timer is lasting; Described timer, for starting timing, when timing time T exceedes preset value Ts after getting described lasting triggering signal, it was shown that the input end of described main circuit, in power-down state, exports power-off signal, when described triggering signal interruption, stops timing.
It is understood that the connecting object of described decision circuitry 30 input can according to user's request sets itself, for instance described vice-side winding is secondary main winding or secondary auxiliary winding. Described sampled signal Vs is equally possible to be selected voluntarily according to user's request, for instance it can be level signal, current signal or power signal.
It is understood that be directed to above-mentioned LED driver control circuit, disclosed herein as well is a kind of LED driver, including the LED driver control circuit disclosed in the above-mentioned any one embodiment of main circuit 10 and the application.
Certainly, with above-described embodiment disclosed in LED driver corresponding, disclosed herein as well is a kind of a kind of LED illumination System applying the open LED driver of above-described embodiment, including: LED driver disclosed in the above embodiments of the present application and the LED illumination lamp being connected with described LED driver.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially. And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment. When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this utility model. The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein when without departing from spirit or scope of the present utility model, can realize in other embodiments. Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (9)
1. a LED driver control circuit, is applied in LED driver, is provided with transformator, it is characterised in that including in the main circuit of described LED driver:
Control circuit, decision circuitry and adjustment signal generating circuit;
The first input end of described control circuit is connected with the sampling end of described main circuit, the second end is used for obtaining reference signal, described control circuit is for contrasting the sampled signal collected by described first input end and described reference signal, the control signal that output matches with comparative result, with control described main circuit output signal for setting value;
The input of described decision circuitry is connected with the vice-side winding of described transformator, for judging the input whether power down of described main circuit, if it is, output power-off signal;
The input of described adjustment signal generating circuit is connected with the outfan of described decision circuitry, outfan is connected with the input of described control circuit, when getting described power-off signal, described adjustment signal generating circuit is used for the input output regulation signal to described control circuit, described adjustment signal is by superposing with described sampled signal or reference signal so that the size less than the setting value before not regulating of the described setting value after first adjustment.
2. LED driver control circuit according to claim 1, it is characterized in that, when getting described power-off signal, described adjustment signal generating circuit is for pressing, to the output of described control circuit, the adjustment signal presetting slope gradual change, described adjustment signal is by superposing with described sampled signal or reference signal, described setting value after regulating is gradually increased to the setting value before not regulating by 0, and wherein, the described setting value after described first adjustment is 0.
3. LED driver control circuit according to claim 1, it is characterised in that the outfan of described adjustment signal generating circuit is connected with the first input end of described control circuit, described in getting
During power-off signal, for export one identical with described reference signal and by a fixed slope to 0 close adjustment signal, wherein, the described setting value after described first adjustment is 0.
4. LED driver control circuit according to claim 1, it is characterized in that, the outfan of described adjustment signal generating circuit is connected with the second input of described control circuit, when getting described power-off signal, for export one contrary with described reference signal and by a fixed slope to 0 close adjustment signal, wherein, the described setting value after described first adjustment is 0.
5. LED driver control circuit according to claim 1, it is characterised in that described decision circuitry includes:
Comparator, for the voltage signal on described vice-side winding and predetermined level signal being compared, when the voltage signal on described vice-side winding is less than described predetermined level signal, to the triggering signal that timer output is lasting;
Timer, for starting timing after getting described lasting triggering signal, exports power-off signal when timing time exceedes preset value.
6. LED driver control circuit according to claim 1, it is characterised in that described vice-side winding is secondary main winding or secondary auxiliary winding.
7. LED driver control circuit according to claim 1, it is characterised in that described sampled signal is level signal, current signal or power signal.
8. a LED driver, including main circuit, it is characterised in that also include LED driver control circuit disclosed in claim 1-7 any one.
9. a LED illumination System, it is characterised in that including: LED driver described in claim 8 and the LED illumination lamp being connected with described LED driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520865038.5U CN205305183U (en) | 2015-11-02 | 2015-11-02 | LED driver control circuit , LED driver and LED lighting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520865038.5U CN205305183U (en) | 2015-11-02 | 2015-11-02 | LED driver control circuit , LED driver and LED lighting system |
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| CN205305183U true CN205305183U (en) | 2016-06-08 |
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| CN201520865038.5U Active CN205305183U (en) | 2015-11-02 | 2015-11-02 | LED driver control circuit , LED driver and LED lighting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567951A (en) * | 2022-03-10 | 2022-05-31 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
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2015
- 2015-11-02 CN CN201520865038.5U patent/CN205305183U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567951A (en) * | 2022-03-10 | 2022-05-31 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
| CN114567951B (en) * | 2022-03-10 | 2023-12-22 | 四维生态科技（杭州）有限公司 | Method and device for adjusting lighting system and computer storage medium |
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