CN204392640U - A kind of delay startup circuit - Google Patents
A kind of delay startup circuit Download PDFInfo
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- CN204392640U CN204392640U CN201520018688.6U CN201520018688U CN204392640U CN 204392640 U CN204392640 U CN 204392640U CN 201520018688 U CN201520018688 U CN 201520018688U CN 204392640 U CN204392640 U CN 204392640U
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- type triode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
This application discloses a kind of delay startup circuit, comprise RC charging circuit, NPN type triode, transistor and the first resistance, wherein: the base stage of described NPN type triode takes back collector electrode through described first resistance R1; Between the collector electrode that described RC charging circuit is connected to described NPN type triode and ground, and be connected with the control end of described transistor, for controlling the output end signal of described transistor; The base stage of NPN type triode described in the output termination of described transistor, the earth terminal ground connection of described transistor, solves the problem that output voltage is on the low side or delay time is not enough of the delay startup circuit occurred because component parameter value is different.
Description
Technical field
The utility model relates to electric and electronic technical field, more particularly, relates to a kind of delay startup circuit.
Background technology
The LED driver of high-quality generally adopts two-stage type circuit structure; front stage circuits realizes Active Power Factor Correction and provides the functions such as DC bus-bar voltage for late-class circuit; late-class circuit realizes the function such as sampling and circuit protection of the output of constant-current source, light modulation and various data; and late-class circuit needs certain time delay to restart; in this delay time, front stage circuits completes preparation, and during to avoid starting shooting, front stage circuit working sequential is chaotic.
Fig. 1 is a kind of common delay startup circuit, and comprise resistance R1, electric capacity C1, resistance R2 and NPN type triode Q1, its operation principle is: after powering on, input voltage V
incharged to C1 by R1, after the base voltage of Q1 is greater than the tube voltage drop between base stage and emitter, Q1 starts conducting, its emitter voltage (i.e. output voltage V
out) slowly rise; After charging certain time interval T, output voltage V
outbe enough to start late-class circuit, the time, T was start-up time delay.
But this design is output voltage V when practice
outoften than input voltage V
inmuch lower, cause late-class circuit cisco unity malfunction sometimes, the reason of this result is caused to be that R1 value is excessive, make the base current of Q1 less than normal, pressure drop between collector electrode and emitter is excessive to be caused, if and R1 is got little, the value of C1 will strain great talent mutually and can meet the requirement of circuit to delay time, but adopt the electric capacity of large capacitance to be worthless concerning the LED driver with certain cost and cloth board space, so, the output voltage V occurred because component parameter value is different how is solved
outthe problem that on the low side or delay time is not enough, just becomes this area problem demanding prompt solution.
Utility model content
In view of this, the utility model provides a kind of delay startup circuit, to solve the problem that output voltage is on the low side or delay time is not enough of the delay startup circuit occurred because component parameter value is different.
A kind of delay startup circuit, comprises RC charging circuit, NPN type triode, transistor and the first resistance, wherein:
The base stage of described NPN type triode takes back collector electrode through described first resistance R1;
Between the collector electrode that described RC charging circuit is connected to described NPN type triode and ground, and be connected with the control end of described transistor, for controlling the output end signal of described transistor;
The base stage of NPN type triode described in the output termination of described transistor, the earth terminal ground connection of described transistor.
Wherein, described RC charging circuit comprises the second resistance between collector electrode and ground and the 3rd resistance that are serially connected in described NPN type triode successively, and is connected in parallel on the electric capacity at described 3rd resistance two ends.
Wherein, described transistor is PNP type triode; The grounded collector of described PNP type triode, its base stage connects the tie point of described second resistance and described 3rd resistance, and its emitter connects the base stage of described NPN type triode.
Wherein, described RC charging circuit comprises the second resistance between collector electrode and ground, electric capacity and the 3rd resistance that are serially connected in described NPN type triode successively.
Wherein, described transistor is NMOS tube; The source ground of described NMOS tube, its grid connects the tie point of described electric capacity and described 3rd resistance, and its drain electrode connects the base stage of described NPN type triode.
As can be seen from above-mentioned technical scheme, the transistor in the utility model in the conducting of delay startup circuit powered on moment, along with input voltage V
inrC charging circuit is charged, input voltage V
incontrol NPN type triode conducting by the first resistance, NPN type triode emitter starts output voltage, i.e. output voltage V
out; After certain hour, RC charging circuit completes charging, input voltage V
inby the first resistance control NPN triode saturation conduction, output voltage V
outreach stationary value.Start-up time delay is determined by the component parameter value of RC charging circuit, output voltage V
outstationary value by input voltage V
invalue determine, there will not be the component parameter value because of RC charging circuit different and cause output voltage V
outthe problem that on the low side or delay time is not enough.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment 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 only 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.
Fig. 1 is a kind of delay startup circuit structural representation disclosed in prior art;
Fig. 2 is a kind of delay startup circuit structural representation disclosed in the utility model embodiment;
Fig. 3 is the particular circuit configurations schematic diagram of the first implementation of delay startup circuit in Fig. 2;
Fig. 4 is the particular circuit configurations schematic diagram of the second implementation of delay startup circuit in Fig. 2.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only 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.
See Fig. 2, the utility model embodiment discloses a kind of delay startup circuit, to solve the problem of the LED driver late-class circuit cisco unity malfunction caused because component parameter value difference impacts delay startup circuit performance, comprise RC charging circuit 10, NPN type triode Q1, transistor Q2 and the first resistance R1, wherein:
The base stage of NPN type triode Q1 takes back collector electrode through the first resistance R1; The input of the current collection of NPN type triode Q1 very delay startup circuit, in order to receive the input voltage V that power circuit provides
in, the output of the transmitting of NPN type triode Q1 very delay startup circuit, in order to provide output voltage V to the circuit module that such as LED driver late-class circuit etc. needs time delay to restart
out;
RC charging circuit 10 is connected between the collector electrode of NPN type triode Q1 and ground, and is connected with the control end of transistor Q2, for controlling the output end signal of transistor Q2;
The base stage of the output termination NPN type triode Q1 of transistor Q2, the earth terminal ground connection of transistor Q2.
The operation principle of described delay startup circuit is: transistor Q2 in the conducting of delay startup circuit powered on moment, along with input voltage V
inrC charging circuit 10 is charged, NPN type triode Q1 conducting, input voltage V
inthe emitter voltage of NPN type triode Q1 is controlled, i.e. output voltage V by the first resistance R1
out; After certain hour, RC charging circuit 10 completes charging, input voltage V
inelectric current through the first resistance R1 flows into NPN type triode Q1 base stage enough greatly, makes NPN type triode Q1 saturation conduction, now output voltage V
outwith input voltage V
inbetween almost without pressure reduction, meet the requirement of LED driver late-class circuit to starting resistor, output voltage V
outfinal stationary value by input voltage V
invalue determine.Start-up time delay is determined by the component parameter value of RC charging circuit 10, in order to meet the requirement to delay time, the following provides the implementation that delay startup circuit two kinds is different:
1) in Fig. 2 the particular circuit configurations of the first implementation of delay startup circuit as shown in Figure 3, wherein:
RC charging circuit 10 comprises and is serially connected in the second resistance R2 between the collector electrode of NPN type triode Q1 and ground and the 3rd resistance R3 successively, and is connected in parallel on the electric capacity C1 at the 3rd resistance R3 two ends;
Transistor Q2 is PNP type triode, and the earth terminal of transistor Q2, control end and output be the collector electrode of corresponding PNP type triode, base stage and emitter respectively; The grounded collector of PNP type triode Q2, its base stage connects the tie point of the second resistance R2 and the 3rd resistance R3, and its emitter connects the base stage of NPN type triode Q1.
The operation principle of circuit shown in Fig. 3 is:
Delay startup circuit powered on moment, electric capacity C1 both end voltage V
c1=0, three resistance R3 is shorted, now the base voltage V of PNP type triode Q2
b-2=V
c1=0, PNP type triode Q2 transient switching; The emitter voltage V of PNP type triode Q2
e-2equal its base voltage V
b-2add tube voltage drop between the emitter of PNP type triode Q2 and base stage (suppose that tube voltage drop is 0.6V, below as), i.e. V
e-2=V
b-2+ 0.6=V
c1+ 0.6; Along with input voltage V
into the continuous charging of electric capacity C1, the emitter voltage V of PNP type triode Q2
e-2continuous rising, finally makes NPN type triode Q1 conducting, and now the emitter of NPN type triode Q1 starts output voltage, i.e. output voltage V
outvoltage to start from scratch rising; From the characteristic of triode, the emitter voltage V of NPN type triode Q1
e-1equal its base voltage V
b-1deduct the tube voltage drop between the base stage of NPN type triode Q1 and emitter, i.e. V
e-1=V
b-1-0.6, again because V
b-1=V
e-2, therefore V
e-1=V
c1, the emitter voltage V of visible NPN type triode Q1
e-1equal electric capacity C1 both end voltage in linear conducting phase, and change along with the change of electric capacity C1 both end voltage; Electric capacity C1 charges after certain hour, the emitter voltage V of NPN type triode Q1
e-1rise to the starting resistor of LED driver late-class circuit, now LED driver late-class circuit starts to start work, and time delay terminates, and delay time is start to start work during this period of time to LED driver late-class circuit from delay startup circuit powers on.
After electric capacity C1 charges, electric capacity C1 both end voltage value is at V
in* R3/ (R2+R3) place stablizes, and is now selected within the specific limits by the aspect ratio of the second resistance R2 and the 3rd resistance R3, ensures the voltage stabilizing value V of electric capacity C1
in* R3/ (R2+R3) and input voltage V
indeviation very little, input voltage V
inthe base current flowing into NPN type triode Q1 through the first resistance R1 is very large, makes NPN type triode Q1 saturation conduction, output voltage V
outwith input voltage V
inbetween almost without pressure reduction, thus meet LED drive late-class circuit to the requirement of starting resistor.
Visible, this programme only needs to consider the aspect ratio of the second resistance R2 and the 3rd resistance R3 to select within the specific limits, can meet LED and drive late-class circuit to the requirement of starting resistor; Delay time is by the second resistance R2, and the value of the 3rd resistance R3 and electric capacity C1 arbitrarily sets, and can avoid the problem occurring delay time deficiency.
2) in Fig. 2 the particular circuit configurations of the second implementation of delay startup circuit as shown in Figure 4, wherein:
RC charging circuit 10 comprises and is serially connected in the second resistance R2, electric capacity C1 between the collector electrode of NPN type triode Q1 and ground and the 3rd resistance R3 successively;
Transistor Q2 is NMOS tube, and the earth terminal of transistor Q2, control end and output be the source electrode of corresponding PMOS, grid and drain electrode respectively; The source ground of NMOS tube Q2, its grid connects the tie point of electric capacity C1 and the 3rd resistance R3, and its drain electrode connects the base stage of NPN type triode Q1.
The operation principle of circuit shown in Fig. 4 is:
Delay startup circuit powered on moment, electric capacity C1 both end voltage be zero, NMOS tube Q2 grid voltage equal V
in* R3/ (R2+R3), makes NMOS tube Q2 moment saturation conduction, and its drain electrode output voltage is almost nil, controls NPN type triode Q1 and closes, output voltage V
out=0;
Along with input voltage V
into the continuous charging of electric capacity C1, electric capacity C1 both end voltage constantly rises until reach V
in, the second resistance R2 and the 3rd resistance R3 both end voltage constantly reduce until be zero thereupon, and NMOS tube Q2 exits saturation conduction thereupon, enters linear conducting region, then ends, and accordingly, the drain voltage of NMOS tube Q2 slowly rises to V by zero
in; In this process, input voltage V
inthe electric current flowing into NPN triode Q1 through the first resistance R1 changes from small to big, and controls NPN type triode Q1 by by the end of linear conducting, finally enters saturation conduction state, and the emitter voltage controlling NPN type triode Q1 (is also output voltage V
out) slowly from the starting resistor be raised to needed for LED driver late-class circuit above freezing, so far, time delay terminates.
In this programme, because NPN type triode Q1 is finally in saturation conduction state, output voltage V
outwith input voltage V
inpressure reduction very little, thus meet LED drive late-class circuit to the requirement of starting resistor.The final voltage at electric capacity C1 two ends is V
in, NMOS tube Q2 is finally in cut-off state, and delay time is by the second resistance R2, and the value of the 3rd resistance R3 and electric capacity C1 arbitrarily sets, and can meet the requirement to delay time.
In sum, the transistor in the utility model in the conducting of delay startup circuit powered on moment, along with input voltage V
inrC charging circuit is charged, input voltage V
incontrol NPN type triode conducting by the first resistance, NPN type triode emitter starts output voltage, i.e. output voltage V
out; After certain hour, RC charging circuit completes charging, input voltage V
inby the first resistance control NPN triode saturation conduction, output voltage V
outreach stationary value.Start-up time delay is determined by the component parameter value of RC charging circuit, output voltage V
outstationary value by input voltage V
invalue determine, there will not be the component parameter value because of RC charging circuit different and cause output voltage V
outthe problem that on the low side or delay time is not enough.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a delay startup circuit, is characterized in that, comprises RC charging circuit, NPN type triode, transistor and the first resistance, wherein:
The base stage of described NPN type triode takes back collector electrode through described first resistance R1;
Between the collector electrode that described RC charging circuit is connected to described NPN type triode and ground, and be connected with the control end of described transistor, for controlling the output end signal of described transistor;
The base stage of NPN type triode described in the output termination of described transistor, the earth terminal ground connection of described transistor.
2. delay startup circuit according to claim 1, is characterized in that, described RC charging circuit comprises the second resistance between collector electrode and ground and the 3rd resistance that are serially connected in described NPN type triode successively, and is connected in parallel on the electric capacity at described 3rd resistance two ends.
3. delay startup circuit according to claim 2, it is characterized in that, described transistor is PNP type triode, wherein: the grounded collector of described PNP type triode, its base stage connects the tie point of described second resistance and described 3rd resistance, and its emitter connects the base stage of described NPN type triode.
4. delay startup circuit according to claim 1, is characterized in that, described RC charging circuit comprises the second resistance between collector electrode and ground, electric capacity and the 3rd resistance that are serially connected in described NPN type triode successively.
5. delay startup circuit according to claim 4, it is characterized in that, described transistor is NMOS tube, wherein: the source ground of described NMOS tube, its grid connects the tie point of described electric capacity and described 3rd resistance, and its drain electrode connects the base stage of described NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520018688.6U CN204392640U (en) | 2015-01-12 | 2015-01-12 | A kind of delay startup circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520018688.6U CN204392640U (en) | 2015-01-12 | 2015-01-12 | A kind of delay startup circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204392640U true CN204392640U (en) | 2015-06-10 |
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| CN201520018688.6U Active CN204392640U (en) | 2015-01-12 | 2015-01-12 | A kind of delay startup circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
| CN109672434A (en) * | 2018-12-24 | 2019-04-23 | 优数通（北京）科技有限公司 | A kind of automobile electronic controller supply voltage delay unlatching protection circuit |
| CN110996467A (en) * | 2019-12-31 | 2020-04-10 | 深圳市英可瑞直流技术有限公司 | Illumination dimming control method |
| CN111049466A (en) * | 2019-12-10 | 2020-04-21 | 珠海凯邦电机制造有限公司 | Anti-interference circuit, device and electrical equipment |
| CN112804793A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
-
2015
- 2015-01-12 CN CN201520018688.6U patent/CN204392640U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
| CN109672434A (en) * | 2018-12-24 | 2019-04-23 | 优数通（北京）科技有限公司 | A kind of automobile electronic controller supply voltage delay unlatching protection circuit |
| CN111049466A (en) * | 2019-12-10 | 2020-04-21 | 珠海凯邦电机制造有限公司 | Anti-interference circuit, device and electrical equipment |
| CN110996467A (en) * | 2019-12-31 | 2020-04-10 | 深圳市英可瑞直流技术有限公司 | Illumination dimming control method |
| CN112804793A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
| CN112804793B (en) * | 2021-04-13 | 2021-12-21 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
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| GR01 | Patent grant |