CN205017654U - Drive circuit of ballast type LED lamp - Google Patents
Drive circuit of ballast type LED lamp Download PDFInfo
- Publication number
- CN205017654U CN205017654U CN201520769251.6U CN201520769251U CN205017654U CN 205017654 U CN205017654 U CN 205017654U CN 201520769251 U CN201520769251 U CN 201520769251U CN 205017654 U CN205017654 U CN 205017654U
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- resistance
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- transistor
- filter capacitor
- optocoupler
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- 239000003990 capacitor Substances 0.000 claims description 31
- 238000005070 sampling Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a drive circuit of ballast type LED lamp, it increases the power identification circuit to have adopted in sampling circuit's series -wound loop to and provide the technical scheme that exoelectric resistance R4 implemented control to filter capacitance C1. The utility model provides a during ballast formula power supply circuit stop work and power outage back output all can have the voltage that is higher than 50V for a long time, consequently be not conform to the problem of relevant standard. And this technical scheme does not increase the loss of circuit.
Description
Technical field
The utility model relates to a kind of driving power of solid luminous lamp, more particularly, relates to a kind of drive circuit of ballast formula LED.
Background technology
LED semiconductor lighting is the new industry that State Council accelerates cultivation and development strategy.In the recent period, the Department of Science and Technology has worked out " semiconductor lighting development in science and technology " 12 " ad hoc planning ", in the application technical research of the key task of ad hoc planning, proposes and develops efficient, low cost, highly reliable LED drive power.Which illustrate the importance of LED drive power in technology of semiconductor illumination application field.
Because the life-span of LED depends on driving power, the lamp failure of more than 99% is all because driving power causes, the life-span of LED reaches more than 50000h, but the life-span of driving power supporting with it is generally only about 10000h. so can LED lighting device one of the key link of application be its driving power problem.For prior art Problems existing, Chinese patent notification number CN202931605U, Chinese patent notification number CN203340369U, Chinese patent notification number CN203340329U, Chinese patent notification number CN203675406U etc., propose the brand new technical scheme of the driving power of ballast formula LED, this driving power compared with the existing technology has high efficiency, highly reliable, the distinguishing feature such as long-life and low cost.In the application aspect of high-power LED lamp, because the temperature characterisitic of the lamp voltage-current characteristic of LED is generally-4mV/ DEG C, even if the temperature characterisitic of this voltage-current characteristic shows to carry out driving LED lamp with constant-current source, when temperature wide variation (region is different, season is different, lamp starting the variations in temperature to stable man-hour), the power of lamp can be made to change, and this is the indeterminable technical problem of driving of existing LED.And the inherent characteristic of driving power according to ballast formula LED, just can efficiently solve this technical problem, when changing at modulating voltage temperature influence, the driving power of ballast formula LED can make the power of LED keep stable.The above-mentioned fact shows, what LED needed is not constant-current source, neither constant pressure source, but can meet the ballast formula driving power that LED requires.Accordingly, the driving power of ballast formula LED will be the direction of future development.In the circuit of above-mentioned ballast formula driving power, the output of its circuit, in order to obtain less output ripple, carrys out filtering with regard to needing the very large electric capacity of access.This circuit demonstrates excellent performance normal hour.But when foregoing circuit quits work and after power cut-off, because above-mentioned filter capacitor does not have discharge loop, all can there is the voltage higher than 50V in output, therefore do not meet the regulation of relevant criterion for a long time.
Summary of the invention
In view of the above-mentioned defect that prior art exists, after the utility model provides a kind of power-off, the circuit of electric discharge can be provided for filter capacitor.
In order to achieve the above object, the utility model takes following technical scheme: a kind of drive circuit of ballast formula LED, comprise sample circuit, direct current exports and filter circuit, it is characterized in that: in the series loop of described sample circuit, be connected to power supply identification circuit, for filter capacitor (C1) provides the control circuit of the 4th resistance (R4) of electric discharge after described direct current exports and the two ends of filter circuit are connected to power-off.
Described power supply identification circuit is made up of the input (B1) of optocoupler, the positive pole of the input (B1) of optocoupler is connected with one end of the 5th resistance (R5), (N) that its other end and power supply input holds and is connected, for filter capacitor (C1) provides the output (B2) of control circuit by optocoupler of the 4th resistance (R4) of discharge loop after described power-off, first resistance (R1), the first transistor (Q1), second resistance (R2), 3rd resistance (R3), transistor seconds (Q2), 4th resistance (R4) is formed, the output (B2) of optocoupler connect with the first resistance (R1) after the positive pole of a termination filter capacitor (C1) and contact (E1), the base stage of another termination the first transistor (Q1), the positive pole of one termination filter capacitor (C1) of the second resistance (R2) and contact (E1), the collector electrode of another termination the first transistor (Q1), the emitter of the first transistor (Q1) connects negative pole and the contact (E2) of filter capacitor (C1), the collector electrode of one termination the first transistor (Q1) of the 3rd resistance (R3) and the junction of the second resistance (R2), the base stage of another termination transistor seconds (Q2), the positive pole of one termination filter capacitor (C1) of the 4th resistance (R4) and contact (E1), the collector electrode of another termination transistor seconds (Q2), the emitter of transistor seconds (Q2) connects negative pole and the contact (E2) of filter capacitor (C1).
The utility model has the advantage of: after adopting the technical solution of the utility model, because filtered electrical has resistance R4 after a loss of power for filter capacitor provides discharge loop, the electric charge that filter capacitor is stored very short after a loss of power time discharges, and solves the problem that ballast formula driving power does not meet relevant criterion.Of the present utility modelly to be also advantageous in that: control as filter capacitor C1 provides the resistance R4 of electric discharge by the power supply identification circuit be arranged in the series loop of sample circuit, make discharge resistance R4 at the normal operation of the driving power circuit not place in circuit of ballast formula LED, only have and just access as filter capacitor C1 discharges after a loss of power.Such mode of operation did not have the problem of discharge loop after both having solved filter capacitor power-off, do not increase again the loss of circuit.
Accompanying drawing explanation
Fig. 1 is the part circuit structure schematic diagram of the driving power of existing ballast formula LED.
Fig. 2 is the part circuit structure schematic diagram of the driving power of ballast formula LED containing technical solutions of the utility model.
Embodiment
Shown in Fig. 1 is the existing driving circuit structure schematic diagram with the ballast formula LED of short-circuit protection and open-circuit-protection.
Shown in Fig. 2 is the part circuit structure schematic diagram of the driving power of ballast formula LED containing technical solution of the present invention.In figure, in the series loop of sample circuit, be also connected to power supply identification circuit, the control circuit of the resistance R4 of electric discharge is provided for filter capacitor C1 after direct current exports and the two ends of filter circuit are connected to power-off.Described power supply identification circuit is made up of the input B1 of optocoupler, the positive pole of the input B1 of optocoupler is connected with one end of resistance R5, the N that its other end and power supply input holds and is connected, for filter capacitor C1 provides the output B2 of control circuit by optocoupler of the 4th resistance R4 of discharge loop after described power-off, resistance R1, transistor Q1, resistance R2, resistance R3, transistor Q2, resistance R4 is formed, the positive pole of a termination filter capacitor C1 and contact E1 after the output B2 of optocoupler connects with resistance R1, the base stage of another termination transistor Q1, the positive pole of the one termination filter capacitor C1 of resistance R2 and contact E1, the collector electrode of another termination transistor Q1, the emitter of transistor Q1 meets negative pole and the contact E2 of filter capacitor C1, the collector electrode of one termination transistor Q1 of resistance R3 and the junction of resistance R2, the base stage of another termination transistor Q2, the positive pole of the one termination filter capacitor C1 of resistance R4 and contact E1, the collector electrode of another termination transistor Q2, the emitter of transistor Q2 meets negative pole and the contact E2 of filter capacitor C1.
In the circuit of fig. 2, input B1 due to optocoupler be series connection in the series loop of the sample circuit of the driving of ballast formula LED, be to solve power supply identification circuit and direct current exports and the problem on common ground between filter circuit two circuit with the input B1 of optocoupler as power supply identification circuit.As seen from the figure, the access of the input B1 of optocoupler does not increase the loss of circuit.
In the circuit of fig. 2, the output B2 of optocoupler, resistance R1 are the base resistances of transistor Q1, resistance R2 is the collector load resistor of transistor Q1, resistance R3 is the base resistance of transistor Q2, and resistance R4 is the collector load resistor (being also the discharge resistance after filter capacitor C1 power-off) of transistor Q2.
The operation principle of the technical solution of the utility model: when the drive circuit of ballast formula LED normally works, the input B1 being connected on the optocoupler in the series loop of sample circuit has electric current, the output B2 resistance decreasing of optocoupler, the output B2 of the optocoupler of resistance R1 and resistance decreasing provides base current (can make transistor Q1 saturation conduction) to transistor Q1, transistor Q1 saturation conduction.The current collection very electronegative potential of transistor Q1, transistor Q2 ends, and resistance R4 disconnects.When the input power-off of the driving of ballast formula LED, the input B1 being connected on the optocoupler in the series loop of sample circuit does not have electric current, and the resistance of the output B2 of optocoupler is very large (being equivalent to open circuit), and transistor Q1 is because ending without base current.The current collection very high potential of transistor Q1, transistor Q2 conducting (saturation conduction), resistance R4 is attempted by the two ends of filter capacitor C1, is discharged the time very short after a loss of power for the electric charge of filter capacitor storage.The power of transistor Q2 is decided by the size of resistance R4, and the size of resistance R4 also determines discharge time.Take into account both the present embodiment resistance R4 preferably 10 ~ 20 kilohms.
What above-mentioned the utility model was enumerated is only better embodiment of the present utility model, and all equivalent technology conversion done under operation principle of the present utility model and thinking, are all considered as protection range of the present utility model.
Claims (2)
1. the drive circuit of a ballast formula LED, comprise sample circuit, direct current exports and filter circuit, it is characterized in that: in the series loop of described sample circuit, be connected to power supply identification circuit, for filter capacitor (C1) provides the control circuit of the 4th resistance (R4) of electric discharge after described direct current exports and the two ends of filter circuit are connected to power-off.
2. the drive circuit of a kind of ballast formula LED according to claim 1, it is characterized in that: described power supply identification circuit is made up of the input (B1) of optocoupler, the positive pole of the input (B1) of optocoupler is connected with one end of the 5th resistance (R5), (N) that its other end and power supply input holds and is connected, for filter capacitor (C1) provides the output (B2) of control circuit by optocoupler of the 4th resistance (R4) of discharge loop after described power-off, first resistance (R1), the first transistor (Q1), second resistance (R2), 3rd resistance (R3), transistor seconds (Q2), 4th resistance (R4) is formed, the output (B2) of optocoupler connect with the first resistance (R1) after the positive pole of a termination filter capacitor (C1) and contact (E1), the base stage of another termination the first transistor (Q1), the positive pole of one termination filter capacitor (C1) of the second resistance (R2) and contact (E1), the collector electrode of another termination the first transistor (Q1), the emitter of the first transistor (Q1) connects negative pole and the contact (E2) of filter capacitor (C1), the collector electrode of one termination the first transistor (Q1) of the 3rd resistance (R3) and the junction of the second resistance (R2), the base stage of another termination transistor seconds (Q2), the positive pole of one termination filter capacitor (C1) of the 4th resistance (R4) and contact (E1), the collector electrode of another termination transistor seconds (Q2), the emitter of transistor seconds (Q2) connects negative pole and the contact (E2) of filter capacitor (C1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520769251.6U CN205017654U (en) | 2015-09-28 | 2015-09-28 | Drive circuit of ballast type LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520769251.6U CN205017654U (en) | 2015-09-28 | 2015-09-28 | Drive circuit of ballast type LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205017654U true CN205017654U (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520769251.6U Expired - Fee Related CN205017654U (en) | 2015-09-28 | 2015-09-28 | Drive circuit of ballast type LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205017654U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559932A (en) * | 2015-09-28 | 2017-04-05 | 李顺华 | A kind of drive circuit of ballast formula LED |
-
2015
- 2015-09-28 CN CN201520769251.6U patent/CN205017654U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559932A (en) * | 2015-09-28 | 2017-04-05 | 李顺华 | A kind of drive circuit of ballast formula LED |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 |