CN201789653U - Non-isolated LED lamp tube constant-current driving power supply - Google Patents
Non-isolated LED lamp tube constant-current driving power supply Download PDFInfo
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- CN201789653U CN201789653U CN2009202063870U CN200920206387U CN201789653U CN 201789653 U CN201789653 U CN 201789653U CN 2009202063870 U CN2009202063870 U CN 2009202063870U CN 200920206387 U CN200920206387 U CN 200920206387U CN 201789653 U CN201789653 U CN 201789653U
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- power supply
- led lamp
- fluorescent tube
- current driving
- resistance
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Abstract
The utility model discloses a non-isolated LED lamp tube constant-current driving power supply, which comprises a main control A704 and an EMI filter circuit. A second pin of the main control A704 is connected to an LED lamp tube after passing through a Q1, an R5, an R6, an R7 and an inductor L3; the R5, the R6 and the R7 are in parallel connection; the other end of the LED lamp tube is grounded after being inputted to a chip AMC7140; a grounding resistor R12 and a grounding resistor R13 are connected onto the chip AMC7140; and the EMI filter circuit consisting of an F1, an R1, a C1 and an L1 is inputted to a bridge-type rectifier after filtering. The power supply not only is stable in constant current and small in volume, but also is low in no-load voltage and can protect an LED lamp from damage caused by over-high voltage.
Description
Technical field
The utility model relates to a kind of power supply of constant-current driving LED illuminating lamp, particularly a kind of non-isolated LED fluorescent tube constant-current driving power supply.
Background technology
The LED product has vast market prospect, and is especially unquestionable especially at lighting field.LED is exactly its power issue in the difficult problem that lighting field faced at present.Traditional LED power supply has dual mode.A kind of is resistance-capacitance depressurization, though cost is low, has the not enough and relatively poor shortcoming of current stabilization ability of the precision of voltage regulation, greatly reduces the useful life of LED; The 2nd, adopt Switching Power Supply, preferably use constant current, can not influence the useful life of LED like this, but its no overvoltage protection, constant current is poor, poor stability, and the cost higher volumes is bigger.
Summary of the invention
In order to overcome the existing defective of LED conventional power source, the utility model provides a kind of constant current effective, safe non-isolated LED fluorescent tube constant-current driving power supply.
A kind of non-isolated LED fluorescent tube constant-current driving power supply, rectifier bridge A704 the 2nd pin is successively by first resistance R 5, second resistance R 6 and the 3rd resistance R 7 of switching tube Q1, parallel connection and the positive pole that inductance L 3 is connected to the LED fluorescent tube, LED fluorescent tube negative pole is input to the OUT end of chip AMC7140, LED fluorescent tube minus earth.
Between input power supply and rectifier bridge, be provided with the EMI filter circuit of forming by fuse F1, the 3rd resistance R 1, first capacitor C 1 and first inductance L 1.
The ISET of described chip AMC7140 is through the 4th resistance R 12 and the 5th resistance R 13 ground connection of serial connection.
The beneficial effects of the utility model are: realize the constant-current driving of LED on basis with low cost, this power volume is little, can be built in LED fluorescent tube inside, and floating voltage is low, can protect the LED lamp can not damage the LED lamp because of overtension.
Description of drawings
Fig. 1 is LED fluorescent tube constant-current driving power supply circuit theory diagrams in the prior art.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Be illustrated in figure 1 as LED fluorescent tube constant-current driving power supply circuit theory diagrams in the prior art, this structural circuit does not have overvoltage protection, and constant current is poor, poor stability, and when input voltage changed greatly, output current and power is linear change thereupon, can't reach the effect of constant current.
Be illustrated in figure 2 as the utility model circuit theory diagrams, rectifier bridge A704 the 2nd pin is connected to the LED fluorescent tube after by Q1 and in parallel R5, R6, R7 and inductance L 3, and the LED fluorescent tube other end inputs to ground connection behind the AMC7140, is connected with earth resistance R on the AMC7140 chip
12, R
13EMI filter circuit by F1 and R1, C1, L1 compose in parallel inputs to the bridge rectifier bridge after the filtering.
The utility model circuit theory is: insert 90 ~ 265V AC power, form the EMI filter circuit by the R1 that is connected with F1, C1, L1, pass through the bridge rectifier bridge fixed direct voltage that weighed relatively, through R2, the R4 current-limiting resistance offers IC-8 pin starting current.When the switching tube conducting, main current loop is DB1-2 pin-Q1-R5, R6, and R7-L3-LED-U2-GND, power to LED this moment, and make inductance L 3 stored energys; When switching tube turn-offed, this moment, inductance L 3 released energy, and main current loop is L3-LED-U2-GND, kept the afterflow output of LED.Because during the switching tube conducting, the electric current that flows through LED also flows through R5 simultaneously, R6, R7, by detection R5, R6, the pressure drop on the R7 reaches the efficient of permanent power, and when the switching tube conducting, voltage provides supply power voltage to work to U2 through DZ1, passes through R
12, R
13Set continuous current, thereby reach the purpose of constant current.In the circuit, C2, C3, D1, D2, D3 is the PFC correcting circuit, the main power factor that improves input.D4, D5, R8, C6 constitutes the auxiliary power supply loop, thereby turn-offs the power supply of HV pin, reduces loss, raises the efficiency.
Claims (3)
1. non-isolated LED fluorescent tube constant-current driving power supply, it is characterized in that: rectifier bridge (A704) the 2nd pin is successively by first resistance (R5), second resistance (R6) and the 3rd resistance (R7) of switching tube (Q1), parallel connection and the positive pole that inductance (L3) is connected to the LED fluorescent tube, LED fluorescent tube negative pole is input to the OUT end of chip AMC7140, LED fluorescent tube minus earth.
2. non-isolated LED fluorescent tube constant-current driving power supply according to claim 1 is characterized in that: be provided with the EMI filter circuit of being made up of fuse (F1), the 3rd resistance (R1), first electric capacity (C1) and first inductance (L1) between input power supply and rectifier bridge.
3. non-isolated LED fluorescent tube constant-current driving power supply according to claim 1 is characterized in that: the ISET of described chip AMC7140 is through the 4th resistance (R12) and the 5th resistance (R13) ground connection of serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202063870U CN201789653U (en) | 2009-10-28 | 2009-10-28 | Non-isolated LED lamp tube constant-current driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202063870U CN201789653U (en) | 2009-10-28 | 2009-10-28 | Non-isolated LED lamp tube constant-current driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201789653U true CN201789653U (en) | 2011-04-06 |
Family
ID=43821601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202063870U Expired - Lifetime CN201789653U (en) | 2009-10-28 | 2009-10-28 | Non-isolated LED lamp tube constant-current driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201789653U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428948A (en) * | 2012-05-24 | 2013-12-04 | 海洋王照明科技股份有限公司 | LED constant current drive circuit and LED light fixture |
| CN104519612A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Wireless remote control light fixture apparatus |
-
2009
- 2009-10-28 CN CN2009202063870U patent/CN201789653U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428948A (en) * | 2012-05-24 | 2013-12-04 | 海洋王照明科技股份有限公司 | LED constant current drive circuit and LED light fixture |
| CN104519612A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Wireless remote control light fixture apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110406 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Shenzhen Dicolor Optoelectronics Co., Ltd. Document name: Notification of Expiration of Patent Right Duration |