CN202282893U - LED driving power supply rapid starting device - Google Patents
LED driving power supply rapid starting device Download PDFInfo
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- CN202282893U CN202282893U CN2011204140328U CN201120414032U CN202282893U CN 202282893 U CN202282893 U CN 202282893U CN 2011204140328 U CN2011204140328 U CN 2011204140328U CN 201120414032 U CN201120414032 U CN 201120414032U CN 202282893 U CN202282893 U CN 202282893U
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Abstract
The present utility model discloses an LED driving power supply rapid starting device. The device comprises a bias circuit, a power supply circuit and a control unit, the bias circuit is composed of a starting resistor and a driving capacitor, and is used for providing grid offset voltage for a power switch tube of the power supply circuit; the power supply circuit comprises the power switch tube, a switching device and a power supply capacitor, the power supply capacitor is used for providing working current and voltage for the control unit; and the control unit is used for opening the switching device during the starting process, enabling current to pass through the power switch tube and the switching device, and charging the power supply capacitor rapidly and realizing rapid starting of an LED driving power supply. The present utility model also discloses an LED driving power supply rapid starting circuit.
Description
Technical field
The utility model relates to a kind of LED driving power start-up circuit, relates in particular to a kind of fast start circuit of LED driving power.
Background technology
Fig. 1 is the sketch map of traditional LED power driving circuit.Starting resistance R3 receives the V+ of driving control unit CU and the negative electrode of the diode D3 that supplies power after connect with power supply capacitor C 1 among the figure; Wherein R3 gives the power supply capacitor C 1 charging when starting; When the voltage on the power supply capacitor C 1 reaches its operating voltage; Power-supply system is worked, and supplies power for the V+ of supply power capacitor C 3 and control unit CU through auxiliary winding Nf and the power supply diode D3 of transformer T1.The FB end that output sampling resistor R6 connects with R5 and receives control unit CU.The other end of sampling resistor R6 is received the anode of power supply diode D3 and Nf one end of the auxiliary winding of transformer T1.The grid of power switch pipe Q1 is received the Vg end of control unit CU, and the end of the former limit of transformer T1 winding Np is received in the drain electrode of power switch pipe Q1, and the source electrode of power switch pipe Q1 is received the end of inductive current sampling resistor Rs1 and the CS end of control unit CU.The other end of the former limit winding Np of transformer T1 is received the anode of input rectifier with opening resistance R 3.The other end of the other end of the other end of inductive current sampling resistor Rs1, the GND of control unit CU, sampling resistor R5, the auxiliary winding Nf of transformer T1 is with the ground end that is connected to the input rectifying bridge.The secondary winding Ns of transformer T1 provides a constant voltage or an electric current to output behind adopt stream diode D1, filter capacitor C4, C5.R9 is dummy load.
Because power supply capacitor C 1 needs to give control unit CU inner module and the power supply of power switch pipe Q1 gate drive circuit, needs bigger appearance value, about 10uF to tens uF usually.Will bring a problem like this, when starting, starting resistance R3 gives the charging interval long (several seconds approximately) of power supply capacitor C 1.Though can shorten start-up time through reducing starting resistance, can when operate as normal, produce bigger loss like this.
The utility model content
The purpose of the utility model is to solve the aforementioned problems in the prior, the circuit that provides a kind of LED driving power to start fast, the start-up time of shortening system.
In order to realize above-mentioned utility model purpose; The utility model provides a kind of LED driving power device for rapidly starting; Comprise a biasing circuit, power supply circuits and a control unit; Said biasing circuit comprises a starting resistance and a drive capacitor, for the power switch pipe of said power supply circuits provides gate bias voltage; Said power supply circuits comprise a power switch pipe, a switching device and a power supply electric capacity, and said power supply electric capacity is that said control unit provides operating current and voltage; Said control unit is opened said switching device in start-up course, make electric current through said power switch pipe and said switching device, realizes the LED driving power for said power supply capacitor fast charging and starts fast.
Further, said biasing circuit comprises the starting resistance and the drive capacitor than low-capacitance of big resistance, and the grid at said power switch pipe after the LED driving power powers on produces bias voltage fast.
The switching device of said power supply circuits, open-minded in LED driving power start-up course, make electric current can pass through said power switch pipe and said switching device, be said power supply capacitor fast charging, make the LED driving power start fast.
Said control unit makes electric current through said power switch pipe and said switching device in the start-up course, said switching device is controlled by said control unit according to said power supply capacitance voltage height after starting.
Said control unit is just controlled said switching device according to said power supply capacitance voltage, and in the course of normal operation, said power supply electric capacity is lower than system thresholds, and said switching device opens and closes automatically, guarantees that said power supply capacitance voltage satisfies system's operate as normal.
Further, said switching device is used separately by MOSFET or diode, perhaps is composed in series by MOSFET and diode.
The utility model provides a kind of LED driving power circuit simultaneously, comprising: input power supply, transformer, output rectifier diode, and LED driving power fast start circuit as indicated above are used for starting fast said LED driving power.
Compared with prior art, the utility model can adopt relatively large starting resistance of resistance and the less relatively drive capacitor of appearance value.Because starting resistance is bigger, so its loss is very little; Because drive capacitor appearance value is less, and the time constant of production is just smaller, start-up time is about the hundreds of millisecond usually simultaneously.So just realized under the situation of not losing efficient, operating voltage is provided for fast control unit CU, system is started fast.Meanwhile, feedback stream diode D1 can give drive capacitor C1 power supply at power switch pipe Q1 blocking interval, and for the grid of power switch pipe Q1 provides driving voltage, to reduce the quiescent current on the starting resistance R3, raise the efficiency.
Description of drawings
Can detail and appendedly graphicly further understood through following utility model about the advantage of the utility model and spirit.
Fig. 1 is traditional LED driving power sketch map;
Fig. 2 is that the shown LED driving power of the utility model is realized the enforcement circuit of startup fast.
Embodiment
Specify the specific embodiment of the utility model below in conjunction with accompanying drawing.
Traditional LED driving power will cause producing long start-up time or bigger loss because the appearance value of power supply capacitor C 1 is bigger.The circuit that the utility model expectation provides a kind of LED driving power to start fast, the start-up time of shortening system.In order to realize above-mentioned utility model purpose; The utility model provides a kind of LED driving power fast start circuit; Comprise a biasing circuit, power supply circuits and a control unit; This biasing circuit comprises a starting resistance and a drive capacitor, for the power switch pipe of these power supply circuits provides gate bias voltage; These power supply circuits comprise a power switch pipe, a switching device and a power supply electric capacity, and this power supply electric capacity provides operating current and voltage for this control unit; This control unit is just controlled this switching device according to this power supply capacitance voltage, makes electric current through this power switch pipe and this switching device, realizes the LED driving power for this power supply capacitor fast charging and starts fast.
Below will combine Fig. 2 to specify the utility model.Fig. 2 is that the shown LED driving power of the utility model is realized the enforcement circuit of startup fast.The utility model adopts source drive, gives the supply power mode of power supply capacitor C 3 chargings through power switch pipe Q1, power switch S1, thereby has realized biasing circuit and control unit CU power supply circuits separately.Biasing circuit just can use bigger starting resistance R3 of resistance and the less relatively drive capacitor C1 of appearance value like this.Thereby realized the purpose that start-up time is short, loss is little.After system's operate as normal, the auxiliary winding Nf of transformer T1 gives the V+ power supply of power supply capacitor C 3 and control unit CU through power supply diode D3.Cause the V+ brownout when the input voltage zero-crossing timing is long; During like LED illumination phase-cut dimming; Control unit CU can do comparison through voltage and the benchmark of its inner setting that V+ end goes to detect on the power supply capacitor C 3; If voltage is during less than the benchmark of its inside, control unit CU will open the inner power switch S1 of control unit CU through the KS1 end, gives the V+ power supply of power supply capacitor C 3 and control unit CU in the S2 off-phases.
As shown in Figure 2, this LED driving power fast start circuit comprises starting resistance R3, drive capacitor C1, feedback stream diode D1, power switch S1, relay diode D2, source drive switching tube S2, control unit CU, power switch pipe Q1 and power supply capacitor C 3.
This starting resistance R3 and drive capacitor C1 series connection; Be connected to the negative electrode of feedback stream diode D1, the grid of power switch pipe Q1 and the ST end of control unit CU, the anode of feedback stream diode D1 is connected to an end of control unit CU in-line power switch S 1, the drain electrode of source class driving switch pipe S2 and the source electrode of power switch pipe Q1.The control end of S1 is connected to the KS1 end of control unit CU, and the other end of S1 connects the anode of relay diode D2, and the negative electrode of D2 is connected to the feeder ear V+ of control unit CU, the positive pole of power supply capacitor C 3 and the negative electrode of power supply diode D3.The anode of D3 is connected to an end and the sampling resistor R6 of the auxiliary winding Nf of transformer T1, and R6 connects with R5 simultaneously, connects the FB end of control unit CU.The source electrode of source class driving switch pipe S2 is connected to the CS end of inductance sampling resistor Rs1 and control unit CU.The drain electrode of power switch pipe Q1 connects the elementary winding Np of transformer T1.The other end of drive capacitor C1, power supply capacitor C 3, inductive current sampling resistor Rs1, output sampling resistor R5 and the GND end of control unit CU are connected to the ground end of rectifier diode DB1 together.The secondary winding Ns of transformer T1 provides a constant voltage or an electric current to output behind adopt stream diode D4, filter capacitor C4, C5.R9 is dummy load.
Starting resistance R3, this starting resistance provides a starting current for control unit CU.Wherein the end of starting resistance R3 is connected to the Vbulk end of rectifier bridge and an end of the elementary winding of transformer T1.The other end is connected to the end of drive capacitor C1, the grid of power switch pipe Q1, the negative electrode of feedback stream diode D1 and the ST end of control unit CU.
Drive capacitor C1, this drive capacitor provides the starting resistor of driving voltage and control unit CU for power switch pipe Q1.The one of which end connects starting resistance R3, the grid of power switch pipe Q1, the negative electrode of feedback stream diode D1 and the ST end of control unit CU.The other end of drive capacitor C1 is held with being connected to.
Power switch pipe Q1, this power switch pipe can give the power supply capacitor C 3 power supplies through power switch S1 when the value that the voltage of power supply on the capacitor C 3 sets less than control unit CU.Its grid is connected to an end of drive capacitor C1 and starting resistance, and drain electrode is connected to an end of the elementary winding of transformer T1, and source electrode is connected to anode, the drain electrode of source drive switching tube S2 and the end of power switch S1 of feedback stream diode D1.
Drive capacitor C1, this drive capacitor provides driving voltage for power switch pipe Q1.The one of which end connects starting resistance R3, the grid of power switch pipe Q1, the negative electrode of feedback stream diode D1 and the ST end of control unit CU, and the other end is held with being connected to.
Feedback stream diode D1, this feedback stream diode is given drive capacitor C1 power supply at power switch pipe Q1 blocking interval.Its negative electrode is connected to the end of drive capacitor C1, the ST end of the grid of power switch pipe Q1 and control unit CU.Anode is connected to the source electrode of power switch pipe Q1, the end of power switch S1 and the drain electrode of source drive switching tube.
Power switch S1, this power switch is open-minded when the value that the voltage of power supply on the capacitor C 3 sets less than control unit CU, and gives the power supply capacitor C 3 power supplies with power switch pipe Q1.The one of which end is connected to anode, the drain terminal of source class driving switch pipe S2 and the source electrode of power switch pipe Q1 of feedback stream diode D1.The other end connects the anode that is fed to relay diode D2.Its control end connects the KS1 of control unit CU.
Relay diode D2, this relay diode are used for preventing that the voltage on the power supply capacitor C 3 is bled off by S2 when source drive switching tube S2 opens.Its anode is received the end of power switch S1, its negative electrode receive power supply capacitor C 3 just with the V+ of control unit CU end.The power switch S1 and the relay diode D2 order of connection can be exchanged.
Power supply capacitor C 3, this power supply electric capacity provides required voltage for control unit CU.Its anodal V+ of control unit CU and the negative electrode of power supply diode D3, minus earth end of connecting.
Source drive switching tube S2; The control of this source drive switching tube controlled unit CU when system's operate as normal; Conducting and the shutoff of driving power switching tube Q1, thus reach the electric current in the control transformer T1 primary winding, make output voltage or electric current be in constant state.Equally when value that the voltage on the capacitor C 3 of supplying power sets less than control unit CU, power switch S1 is open-minded, and source drive switching tube S2 is operated on off state.In the S2 off-phases, just can pass through power switch pipe Q1, power switch S1 and relay diode D2 give the V+ power supply of power supply capacitor C 3 and control unit CU.Its drain electrode is connected to anode, the end of power switch S1 and the source electrode of power switch pipe Q1 of its feedback stream diode D1.Source electrode connects the CS end of inductive current sampling resistor Rs1 and control unit CU.Grid is connected to the KS2 end of control unit CU.
Control unit CU, this control unit CU is responsible for the logic and the controlled function of whole power-supply system.When system start-up; When this control unit CU detects voltage on the power supply capacitor C 3 less than the benchmark of its set inside at V+ end; Hold to send through KS1 and open signal, thereby realize that energy gives the V+ end power supply of power supply capacitor C 3 and control unit CU from power switch pipe Q1, power switch S1 and relay diode D2 to power switch S1.After control unit CU started completion, the ST of this control unit CU end can be the voltage constant on the drive capacitor C1 a fixing value, like 15V; Hold to power switch S1 through KS1 and to send cut-off signals, fast start circuit turn-offs.
When this control unit CU detects voltage on the power supply capacitor C 3 less than the benchmark of its set inside at V+ end; Will hold to send through KS1 and open signal, thereby realize that energy gives the V+ end power supply of power supply capacitor C 3 and control unit CU from power switch pipe Q1, power switch S1 and relay diode D2 to power switch S1.
The LED driving power fast start circuit that the utility model provided adopts relatively large starting resistance R3 and the less relatively drive capacitor C1 of appearance value of resistance.Because starting resistance R3 is bigger, so its loss is just very little; Simultaneously because drive capacitor C1 appearance value is less, it is just smaller that the time constant of being produced by R3*C1--is start-up time--, can design about the hundreds of millisecond usually.So just realized under situation about not lowering efficiency, operating voltage is provided for fast control unit CU, system is started fast.Adopt source drive, and give drive capacitor C1 power supply via feedback stream diode D1,,, raise the efficiency to reduce the quiescent current on the starting resistance R3 for the grid of power switch pipe Q1 provides driving voltage from the source electrode of power switch pipe Q1.Adopt power switch S1 and control unit CU; Control unit CU detects the voltage on the power supply capacitor C 3 through the V+ end; When voltage during less than the value of control unit CU inner setting; Control unit CU holds to send to power switch S1 from KS1 and opens signal, thereby realizes that energy gives the V+ end power supply of power supply capacitor C 3 and control unit CU from power switch pipe Q1, power switch S1.This feedback stream diode, power switch, relay diode, source drive switching tube all are positioned at this control unit CU inside, and the position of this power switch and relay diode is interchangeable.
In another embodiment, the utility model also can omit power switch S1, is directly given the power supply circuits of power supply capacitor C 3 by relay diode D2.This kind power supply circuits only influence the working range of V+ terminal voltage, the flexibility that loss part system effectiveness and system restart.
In another embodiment, the utility model also can omit relay diode D2, is directly given the power supply circuits of power supply capacitor C 3 by power switch S1.
The utility model provides a kind of LED driving power circuit simultaneously, comprising: input power supply, transformer, output rectifier diode, and LED driving power fast start circuit as indicated above are used for starting fast the LED driving power.
The preferred embodiment of the just the utility model described in this specification, above embodiment is only in order to the technical scheme of explanation the utility model but not to the restriction of the utility model.All those skilled in the art according to the design of the utility model through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within the scope of the utility model.
Claims (6)
1. a LED driving power device for rapidly starting comprises a biasing circuit, power supply circuits and a control unit, and said biasing circuit comprises a starting resistance and a drive capacitor, for the power switch pipe of said power supply circuits provides gate bias voltage; Said power supply circuits comprise a power switch pipe, a switching device and a power supply electric capacity, and said power supply electric capacity is that said control unit provides operating current and voltage; Said control unit is opened said switching device in start-up course, make electric current through said power switch pipe and said switching device, realizes the LED driving power for said power supply capacitor fast charging and starts fast.
2. LED driving power device for rapidly starting as claimed in claim 1; It is characterized in that; Said biasing circuit comprises the starting resistance and the drive capacitor than low-capacitance of big resistance, and the grid at said power switch pipe after the LED driving power powers on produces bias voltage fast.
3. LED driving power device for rapidly starting as claimed in claim 1; It is characterized in that; The switching device of said power supply circuits, open-minded in LED driving power start-up course, make electric current can pass through said power switch pipe and said switching device; Be said power supply capacitor fast charging, make the LED driving power start fast.
4. LED driving power device for rapidly starting as claimed in claim 1; It is characterized in that; Said control unit; Make electric current through said power switch pipe and said switching device in the start-up course, after starting said switching device according to said power supply capacitance voltage height by said control unit control switch.
5. LED driving power device for rapidly starting as claimed in claim 1; It is characterized in that said control unit is just controlled said switching device according to said power supply capacitance voltage; In the course of normal operation; Said power supply electric capacity is lower than system thresholds, and said switching device opens and closes automatically, guarantees that said power supply capacitance voltage satisfies system's operate as normal.
6. like the described LED driving power of claim 3 device for rapidly starting, it is characterized in that said switching device is used separately by MOSFET or diode, perhaps use by MOSFET and diode series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204140328U CN202282893U (en) | 2011-10-27 | 2011-10-27 | LED driving power supply rapid starting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204140328U CN202282893U (en) | 2011-10-27 | 2011-10-27 | LED driving power supply rapid starting device |
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| CN202282893U true CN202282893U (en) | 2012-06-20 |
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| CN2011204140328U Expired - Lifetime CN202282893U (en) | 2011-10-27 | 2011-10-27 | LED driving power supply rapid starting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510619A (en) * | 2011-10-27 | 2012-06-20 | 上海晶丰明源半导体有限公司 | Quick start-up device of LED (light-emitting diode) driving power supply |
| CN112235903A (en) * | 2020-10-29 | 2021-01-15 | 深圳市必易微电子股份有限公司 | Control circuit, control method and LED drive circuit thereof |
| CN113037070A (en) * | 2019-12-25 | 2021-06-25 | 上海芯熠微电子有限公司 | Fast starting circuit of switching power supply |
-
2011
- 2011-10-27 CN CN2011204140328U patent/CN202282893U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510619A (en) * | 2011-10-27 | 2012-06-20 | 上海晶丰明源半导体有限公司 | Quick start-up device of LED (light-emitting diode) driving power supply |
| CN113037070A (en) * | 2019-12-25 | 2021-06-25 | 上海芯熠微电子有限公司 | Fast starting circuit of switching power supply |
| CN113037070B (en) * | 2019-12-25 | 2022-11-29 | 上海芯熠微电子有限公司 | Fast starting circuit of switching power supply |
| CN112235903A (en) * | 2020-10-29 | 2021-01-15 | 深圳市必易微电子股份有限公司 | Control circuit, control method and LED drive circuit thereof |
| CN112235903B (en) * | 2020-10-29 | 2024-05-28 | 深圳市必易微电子股份有限公司 | Control circuit, control method and LED driving circuit thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: Shanghai semiconducto Limited by Share Ltd Address before: 201204 Shanghai city Pudong New Area in 299 Lane Road, Room 502 No. 6 Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120620 |