CN203691697U - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
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- CN203691697U CN203691697U CN201320868665.5U CN201320868665U CN203691697U CN 203691697 U CN203691697 U CN 203691697U CN 201320868665 U CN201320868665 U CN 201320868665U CN 203691697 U CN203691697 U CN 203691697U
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Abstract
The utility model discloses an LED constant current driving circuit, which provides constant-current driving for an LED load. The LED constant current driving circuit comprises a self-excited converter which controls the duty ratio of the LED constant current driving circuit, wherein the self-excited converter comprises a first switch element, a winding and a switch driving circuit of the first switch element, the switch driving circuit is arranged between the winding and the first switch element, and the switch driving circuit comprises a triode and a voltage stabilizing tube of which both ends are respectively connected to an emitter and a base of the triode.
Description
[technical field]
The utility model relates to a kind of constant-current drive circuit, especially refers to a kind of constant-current drive circuit of lighting device.
[background technology]
The internal characteristics of LED has determined that it is that optimal light source removes to replace traditional light source, and it has purposes widely.The advantage such as LED has that volume is little, power consumption is low, long service life, high brightness, low in calories, environmental protection, controllability are strong.But because LED is the semiconductor device of characteristic sensitivity, there is again negative temperature characteristic, thereby in application, need it to stablize constant current control.
RCC(Ringing choke converter) auto-excitation type transducer is a kind of a kind of switch power supply topological structure that adopts the output of auto-excitation type concussion mode control energy.Please refer to shown in Fig. 1, the basic principle of RCC circuit control current constant is when the first switch element Q1 winding T1-B positively biased after conducting under start-up circuit effect, drives the further saturation conduction of the first switch element Q1.Reach threshold value rear drive second switch element Q2 conducting when flowing through the peak current of the first switch element Q1, thereby the drive current of diverting switch element Q1 makes the first switch element Q1 exit and enter by district from saturation region.
But in traditional RCC circuit, the drive current of the first switch element Q1 raises along with the rising of input voltage, transistorized loss is increased, thereby cause the power loss of RCC circuit large.
Therefore,, in order to overcome above-mentioned defect, be necessary to provide a kind of improved LED constant-current drive circuit.
[utility model content]
The purpose of this utility model is to provide a kind of LED constant-current drive circuit.
To achieve these goals, the utility model adopts following technical scheme: a kind of LED constant-current drive circuit, for providing constant current, LED load drives, comprise the auto-excitation type transducer of controlling described constant-current drive circuit duty ratio, described auto-excitation type transducer comprises the switch driving circuit of the first switch element, winding and the first switch element, described switch driving circuit is between described winding and described the first switch element, and described switch driving circuit comprises that triode, two ends are connected to the emitter of described triode and the voltage-stabiliser tube of base stage.
Preferably, described switch driving circuit also comprises diode, the first current-limiting resistance and the second current-limiting resistance, described the first current-limiting resistance is connected in the base stage of described triode, described the second current-limiting resistance is connected in the emitter of described triode, described voltage-stabiliser tube one end connects described the first current-limiting resistance, the other end connects described the second current-limiting resistance, and described diode one end connects described the second current-limiting resistance, the collector electrode of other end connecting triode.
Preferably, described auto-excitation type transducer also comprises electric capacity, and described electric capacity one end connects described winding, and the other end connects described switch driving circuit.
Preferably, described auto-excitation type transducer also comprises the trigger-type control circuit being connected with described the first switch element, described trigger-type control circuit absorbs the electric current of described the first switch element to shorten the turn-off time of described the first switch element, and described trigger-type control circuit comprises second switch element, the 3rd switch element of mutual triggering.
Preferably, the second switch element of described trigger-type control circuit is triode, described the 3rd switch element is also triode, and the base stage of described second switch element connects the collector electrode of described the 3rd switch element, and the collector electrode of described second switch element connects the base stage of described the 3rd switch element.
Preferably, between the emitter of described second switch element and base stage, connect filter circuit, between the emitter of described the 3rd switch element and base stage, connect filter circuit.
Preferably, described the first switch element is triode, the base stage of described the first switch element connects the collector electrode of described second switch element and the emitter of described the 3rd switch element, and the emitter of described the first switch element connects the base stage of described second switch element and the collector electrode of described the 3rd switch element.
Preferably, between the emitter of described the first switch element and the base stage of second switch element, connect a voltage-stabiliser tube.
Preferably, between the emitter of described the first switch element and described voltage-stabiliser tube, connect filter circuit.
Preferably, described constant-current drive circuit also comprises DC transfer circuit, described DC transfer circuit connects described the first switch element, the duty ratio of DC transfer circuit described in described the first switch element control, and described trigger-type control circuit shortens the turn-off time of described the first switch element.
Compared to prior art, the utility model LED constant-current drive circuit has following advantage: the switch element constant current of auto-excitation type transducer is driven, make the power consumption of switch element stable, improved the efficiency of LED constant-current drive circuit.
[accompanying drawing explanation]
Fig. 1 is the common topological diagram of RCC constant-current drive circuit in prior art.
Fig. 2 is the circuit diagram of the first preferred embodiment of the utility model LED constant-current drive circuit.
Fig. 3 is the circuit diagram of the second preferred embodiment of the utility model LED constant-current drive circuit.
[embodiment]
Please refer to shown in Fig. 2, in the first preferred embodiment of the utility model LED constant-current drive circuit, LED constant-current drive circuit 1 drives for LED load provides constant current, comprise the auto-excitation type transducer 2 of controlling constant-current drive circuit duty ratio, auto-excitation type transducer 2 comprises the switch driving circuit 21 of the first switch element Q1, winding L 2 and the first switch element Q1, and switch driving circuit 21 is between winding L 2 and the first switch element Q1.Switch driving circuit 21 comprises that triode Q4, two ends are connected to the emitter of triode Q4 and the voltage-stabiliser tube ZD1 of base stage.The base stage of the negative pole connecting triode Q4 of voltage-stabiliser tube ZD1, the emitter of the anodal connecting triode Q4 of voltage-stabiliser tube ZD1.Winding L 2 electric currents are by switch driving circuit 21 rear drive the first switch element Q1 conductings, and the voltage at voltage-stabiliser tube ZD1 two ends is clamped at the voltage stabilizing value of ZD1, and the electric current that therefore flows through triode Q4 emitter is constant.No matter how the voltage of winding L 2 increases, and how input voltage increases, and the voltage at voltage-stabiliser tube ZD1 two ends is clamped at the voltage stabilizing value of ZD1 all the time, and the electric current that makes to flow through triode Q4 emitter is almost constant.Thereby make switch driving circuit 21 for constant-current drive circuit, drive current can not increase because of the increase of input voltage.Meanwhile, switch driving circuit 21 can produce negative pressure in gate pole one end of the first switch element Q1, can accelerate the shutoff of the first switch element Q1.
Auto-excitation type transducer 2 also comprises capacitor C 2, and capacitor C 2 one end connect winding L 2, other end connecting valve drive circuit 21.The collector electrode of triode Q4 connects capacitor C 2.
Auto-excitation type transducer 2 also comprises second switch element Q2, voltage-stabiliser tube ZD2 and sample circuit 22.In the present embodiment, second switch element Q2 is triode, and the collector electrode of second switch element Q2 connects the base stage of the first switch element Q1, grounded emitter, and base stage connects voltage-stabiliser tube ZD2.One end of voltage-stabiliser tube ZD2 connects the base stage of second switch element Q2, and the other end connects respectively emitter and the sample circuit 22 of the first switch element Q1.Same one end of sample circuit 22 connects respectively emitter and the voltage-stabiliser tube ZD2 of the first switch element Q1.Auto-excitation type transducer 2 also comprises filter circuit 23,24.Between the base stage of second switch element Q2 and voltage-stabiliser tube ZD2, be connected between the emitter of filter circuit 23, the first switch element Q1 and voltage-stabiliser tube ZD2 and be connected a filter circuit 24. Filter circuit 23,24 is for filtering.Along with flowing through the increase of electric current of the first switch element Q1 emitter, in the time arriving certain value, second switch element Q2 triggers, and absorbs the base current of the first switch element Q1, thereby turn-offs the first switch element Q1.
LED constant-current drive circuit 1 also comprises DC transfer circuit 10, and DC transfer circuit 10 connects the first switch element Q1.In the present embodiment, DC transfer circuit 10 is reduction voltage circuit, and the input of DC transfer circuit 10 connects the collector electrode of the first switch element Q1, and output connects load 12.
Please refer to shown in Fig. 3, in the second preferred embodiment of the utility model LED constant-current drive circuit, LED constant-current drive circuit 3 drives for LED load provides constant current, comprise the auto-excitation type transducer 4 of controlling constant-current drive circuit duty ratio, auto-excitation type transducer 4 comprises the switch driving circuit 41 of the first switch element Q1, winding L 2 and the first switch element Q1, and switch driving circuit 41 is between winding L 2 and the first switch element Q1.Switch driving circuit 41 comprises that triode Q4, two ends are connected to the emitter of triode Q4 and the voltage-stabiliser tube ZD1 of base stage.The base stage of the negative pole connecting triode Q4 of voltage-stabiliser tube ZD1, the emitter of the anodal connecting triode Q4 of voltage-stabiliser tube ZD1.Winding L 2 electric currents are by switch driving circuit 41 rear drive the first switch element Q1 conductings, and the voltage at voltage-stabiliser tube ZD1 two ends is clamped at the voltage stabilizing value of ZD1, and the electric current that therefore flows through triode Q4 emitter is constant.No matter how the voltage of winding L 2 increases, and how input voltage increases, and the voltage at voltage-stabiliser tube ZD1 two ends is clamped at the voltage stabilizing value of ZD1 all the time, and the electric current that makes to flow through triode Q4 emitter is almost constant.Thereby make switch driving circuit 41 for constant-current drive circuit, drive current can not increase because of the increase of input voltage.
Auto-excitation type transducer 4 also comprises capacitor C 2, and capacitor C 2 one end connect winding L 2, other end connecting valve drive circuit 21.The collector electrode of triode Q4 connects capacitor C 2.
Auto-excitation type transducer 4 also comprises the trigger-type control circuit 42 being connected with the first switch element Q1.Trigger-type control circuit 42 absorbs the electric current of the first switch element Q1, thereby shortens the turn-off time of the first switch element Q1.Trigger-type control circuit 42 comprises second switch element Q2 and the 3rd switch element Q3 of mutual triggering.The second switch element Q2 of trigger-type control circuit 42 is triode, the 3rd switch element Q3 is also triode, the base stage of second switch element Q2 connects the collector electrode of the 3rd switch element Q3, and the collector electrode of second switch element Q2 connects the base stage of the 3rd switch element Q3.In the present embodiment, second switch element Q2 is NPN type triode, and the 3rd switch element Q3 is positive-negative-positive triode.
Auto-excitation type transducer 4 also comprises the diode D7 of the filter circuit 44 that connects between the emitter of filter circuit 43, the three switch element Q3 that connect between the emitter of second switch element Q2 and base stage and base stage, one end connecting valve drive circuit 41, other end ground connection.Diode D7 provides continuous current circuit for winding L 2 in the time that the first switch element Q1 disconnects.Filter circuit 43 comprises the resistance R 14 and the capacitor C 7 that are connected in parallel.The filter circuit 43 that resistance R 14 and capacitor C 7 form, one end connects the base stage of second switch element Q2 and the collector electrode of the 3rd switch element Q3, other end ground connection.Filter circuit 44 comprises the resistance R 2 and the capacitor C 5 that are connected in parallel, one end of the filter circuit 44 that wherein resistance R 2 forms with capacitor C 4 is connected the base stage of emitter and the first switch element Q1 of the 3rd switch element Q3, and the other end connects the collector electrode of second switch element Q2 and the base stage of the 3rd switch element Q3.Between the base stage of the emitter of the first switch element Q1 and second switch element Q2, connect a voltage-stabiliser tube ZD2.Between the emitter of the first switch element Q1 and voltage-stabiliser tube ZD2, connect filter circuit 45.Filter circuit 45 comprises the resistance R 13 that connects the first switch element Q1 emitter, and between one end contact resistance R13 and voltage-stabiliser tube ZD2, the capacitor C 6 of other end ground connection.In the present embodiment, filter circuit 43,44,45 is RC filter circuit.
The emitter of the first switch element Q1 connects sample circuit 46, the other end ground connection of sample circuit 46.Sample circuit 46 comprises the resistance R 15, R16, the R17 that are connected in parallel.
LED constant-current drive circuit 3 also comprises DC transfer circuit 30, and DC transfer circuit 30 connects the first switch element Q1.In the present embodiment, DC transfer circuit 30 is reduction voltage circuit, and the input of DC transfer circuit 30 connects the collector electrode of the first switch element Q1, and output connects load 31.
The auto-excitation type transducer 4 that the utility model utilization has a trigger-type control circuit 42 is controlled the duty ratio of DC transfer circuit 30, when the current sample magnitude of voltage of sample circuit 46 reaches after threshold value, through resistance R 13, capacitor C 6 attracts, and after level and smooth elimination spike, promotes second switch element (NPN triode) Q2 conducting by voltage-stabiliser tube ZD2.After second switch element Q2 conducting, make the 3rd switch element (PNP triode) Q3 conducting, the conducting of the 3rd switch element Q3 provides again second switch element Q2 base stage a forward bias, and second switch element Q2 continues conducting.Second switch element Q2, the 3rd switch element Q3 composition trigger-type control circuit, continue to attract the base current of the first switch element Q1 until winding L 2 polarity of voltage reversions.In whole turn off process, the lower voltage of sample circuit 46 will no longer affect the shutoff of the first switch element Q1.In other embodiment, the first switch element Q1 can be also other switch elements.
In the utility model, trigger-type control circuit 42 is applied to the LED constant-current drive circuit 3 with auto-excitation type transducer 4, makes the shutoff of the first switch element Q1 of auto-excitation type transducer 4 can not be subject to the impact of the voltage of sample circuit 46.When after second switch element Q2 conducting, the second switch element Q2 of trigger-type control circuit 42 and the 3rd switch element Q3 can form from triggering, and keep conducting.Second switch element Q2 can not reduce and turn-off because of the voltage of sample circuit 46, affects and absorbs the electric current that flows through the first switch element Q1 after second switch element Q2 conducting.Therefore, there is the LED constant-current drive circuit 3 of trigger-type control circuit 41, can not be subject to the impact of sample circuit 46 voltages, when the electric current of the first switch element Q1 reaches after peak value, thereby the electric current that absorbs fast the first switch element Q1 continues to turn-off the first switch element Q1, makes the constant current accuracy of LED constant-current drive circuit 3 higher.
Should be noted that, embodiment of the present utility model has preferably implementation, and not the utility model is done to any type of restriction, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement to change or be modified to the effective embodiment being equal to, in every case do not depart from the content of technical solutions of the utility model, any modification or equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. a LED constant-current drive circuit, for providing constant current, LED load drives, comprise the auto-excitation type transducer of controlling described constant-current drive circuit duty ratio, it is characterized in that: described auto-excitation type transducer comprises the switch driving circuit of the first switch element, winding and the first switch element, described switch driving circuit is between described winding and described the first switch element, and described switch driving circuit comprises that triode, two ends are connected to the emitter of described triode and the voltage-stabiliser tube of base stage.
2. LED constant-current drive circuit as claimed in claim 1, it is characterized in that: described switch driving circuit also comprises diode, the first current-limiting resistance and the second current-limiting resistance, described the first current-limiting resistance is connected in the base stage of described triode, described the second current-limiting resistance is connected in the emitter of described triode, described voltage-stabiliser tube one end connects described the first current-limiting resistance, the other end connects described the second current-limiting resistance, described diode one end connects described the second current-limiting resistance, the collector electrode of other end connecting triode.
3. LED constant-current drive circuit as claimed in claim 2, is characterized in that: described auto-excitation type transducer also comprises electric capacity, and described electric capacity one end connects described winding, and the other end connects described switch driving circuit.
4. LED constant-current drive circuit as claimed in claim 1, it is characterized in that: described auto-excitation type transducer also comprises the trigger-type control circuit being connected with described the first switch element, described trigger-type control circuit absorbs the electric current of described the first switch element to shorten the turn-off time of described the first switch element, and described trigger-type control circuit comprises second switch element, the 3rd switch element of mutual triggering.
5. LED constant-current drive circuit as claimed in claim 4, it is characterized in that: the second switch element of described trigger-type control circuit is triode, described the 3rd switch element is also triode, the base stage of described second switch element connects the collector electrode of described the 3rd switch element, and the collector electrode of described second switch element connects the base stage of described the 3rd switch element.
6. LED constant-current drive circuit as claimed in claim 5, is characterized in that: between the emitter of described second switch element and base stage, connect filter circuit, between the emitter of described the 3rd switch element and base stage, connect filter circuit.
7. LED constant-current drive circuit as claimed in claim 5, it is characterized in that: described the first switch element is triode, the base stage of described the first switch element connects the collector electrode of described second switch element and the emitter of described the 3rd switch element, and the emitter of described the first switch element connects the base stage of described second switch element and the collector electrode of described the 3rd switch element.
8. LED constant-current drive circuit as claimed in claim 7, is characterized in that: between the emitter of described the first switch element and the base stage of second switch element, connect a voltage-stabiliser tube.
9. LED constant-current drive circuit as claimed in claim 8, is characterized in that: between the emitter of described the first switch element and described voltage-stabiliser tube, connect filter circuit.
10. LED constant-current drive circuit as claimed in claim 4, it is characterized in that: described constant-current drive circuit also comprises DC transfer circuit, described DC transfer circuit connects described the first switch element, the duty ratio of DC transfer circuit described in described the first switch element control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320868665.5U CN203691697U (en) | 2013-12-26 | 2013-12-26 | LED constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320868665.5U CN203691697U (en) | 2013-12-26 | 2013-12-26 | LED constant current driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203691697U true CN203691697U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320868665.5U Withdrawn - After Issue CN203691697U (en) | 2013-12-26 | 2013-12-26 | LED constant current driving circuit |
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| CN (1) | CN203691697U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754796A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | LED (Light Emitting Diode) constant current driving circuit |
| CN114222400A (en) * | 2021-12-15 | 2022-03-22 | 苏州欧普照明有限公司 | LED driving power supply, driving method and lamp |
-
2013
- 2013-12-26 CN CN201320868665.5U patent/CN203691697U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754796A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | LED (Light Emitting Diode) constant current driving circuit |
| CN114222400A (en) * | 2021-12-15 | 2022-03-22 | 苏州欧普照明有限公司 | LED driving power supply, driving method and lamp |
| CN114222400B (en) * | 2021-12-15 | 2023-07-25 | 苏州欧普照明有限公司 | LED driving power supply, driving method and lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140702 Effective date of abandoning: 20170929 |
|
| AV01 | Patent right actively abandoned |