CN201426195Y - Isolated high-power factor driving power source for LED fluorescent lamps - Google Patents
Isolated high-power factor driving power source for LED fluorescent lamps Download PDFInfo
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- CN201426195Y CN201426195Y CN2009201506091U CN200920150609U CN201426195Y CN 201426195 Y CN201426195 Y CN 201426195Y CN 2009201506091 U CN2009201506091 U CN 2009201506091U CN 200920150609 U CN200920150609 U CN 200920150609U CN 201426195 Y CN201426195 Y CN 201426195Y
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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Abstract
The utility model relates to an isolated high-power factor driving power source for LED fluorescent lamps, which consists of an EMI unit, an input rectifying filter circuit, a power conversion unit and an output rectifying filter circuit, wherein the EMI unit, the input rectifying filter circuit, the power conversion unit and the output rectifying filter circuit are connected sequentially, a powerfactor correction type PWM controller is arranged between the power conversion circuit and the output rectifying filter circuit, the power conversion circuit is an isolated power conversion circuit,the output rectifying filter circuit is connected to the power factor correction type PWM controller via an isolating element and a stabilized voltage loop, and the power factor correction type PWM controller is in output connection with the power conversion circuit. The driving power source utilizes the power factor correction type PWM controller to realize feedback control of power output, utilizes the isolated power conversion circuit, and then is connected to the power factor correction type PWM controller via the isolating element and the stabilized voltage loop, thereby achieving highersafety of primary isolation, increasing input power factor of the LED fluorescent lamps and reducing interference of the lamps to the electric grid.
Description
[technical field]
The utility model relates to a kind of LED fluorescent lamp driving power supply circuit, refers in particular to a kind of conversion efficiency height, uses safer isolated High Power Factor LED fluorescent lamp driving power supply.
[background technology]
Breakthrough along with the LED technology, the appearance of white light LEDs, LED has advantages such as conversion efficiency height, caloric value is low, use is durable, has been subjected to general in the industry favor, in recent years extensively popularization and application in people's daily life, and replacing the common phosphors fluorescent lamp gradually.Yet the power circuit of various at present LED fluorescent lamps all adopts is simply not isolate BUCK type AC/DC Switching Power Supply change-over circuit to cooperate behind the constant current change-over circuit the directly scheme of driving LED lamp array, so integrated circuit not only lacks necessary elementary high pressure isolation, safety in utilization is not good enough, and do not have power factor correction unit in the driving power circuit commonly used, this has caused the conversion efficiency of this type of power circuit lower (its power factor is generally only about 0.5), can't embody the energy-saving effect of LED fluorescent lamp.
[summary of the invention]
The purpose of this utility model is to have overcome above-mentioned defective, provides a kind of have power factor correction and primary and secondary isolation, the safer isolated High Power Factor LED fluorescent lamp driving power supply of the high use of energy conversion efficiency.
The purpose of this utility model is achieved in that a kind of isolated High Power Factor LED fluorescent lamp driving power supply, it comprises EMI unit, input rectifying filter circuit, power conversion circuit, the output rectifier and filter composition that links to each other successively, and its improvements are: also be provided with power factor correction type PWM controller between power conversion circuit and output rectifier and filter; Described power conversion circuit is the isolated form power conversion circuit; Described output rectifier and filter is connected into power factor correction type PWM controller by isolated component, voltage stabilizing loop, and the output of power factor correction type PWM controller connects power conversion circuit;
Described input rectifying filter circuit output is connected with input overvoltage/undervoltage protected location and is connected into power factor correction type PWM controller;
Also be provided with current-limiting protection circuit between described isolated component and power factor correction type PWM controller;
Described power factor correction type PWM controller has also been imported short-circuit protection circuit.
Than common LED fluorescent lamp driving power supply, the beneficial effects of the utility model have been to adopt power factor correction type PWM controller to carry out the FEEDBACK CONTROL of power supply output, adopted the isolated form power conversion circuit in addition, the mode that cooperates isolated component, voltage stabilizing loop to be connected into power factor correction type PWM controller has realized the greater security that primary and secondary is isolated.Improved the input power factor of LED fluorescent lamp greatly, reduced the interference of light fixture electrical network; And improved the security performance of light fixture, can not produce the electric shock phenomenon to the object of people or other contact light fixtures.
[description of drawings]
Below in conjunction with accompanying drawing in detail concrete structure of the present utility model is described in detail
Fig. 1 is a schematic block circuit diagram of the present utility model
Fig. 2 is a circuit diagram of the present utility model
[embodiment]
Below in conjunction with accompanying drawing the utility model specific embodiment is described in detail.
As shown in Figure 1, the utility model relates to a kind of isolated High Power Factor LED fluorescent lamp driving power supply, it comprises EMI unit, input rectifying filter circuit, power conversion circuit, the output rectifier and filter composition that links to each other successively, wherein the 85-264V alternating current is imported in the EMI unit, and the employing of the power conversion circuit in the power circuit is the isolated form power conversion circuit, by using isolating transformer, make non-safe elementary high pressure input AC electricity and final secondary low-voltage partly obtain safe isolation in the circuit through Power Conversion, rectifying and wave-filtering output driving LED.In between power conversion circuit and output rectifier and filter, then be provided with the PWM controller, what this PWM controller adopted is power factor correction type PWM controller, secondary output voltage current signal feeds back to elementary by isolated component, be connected into power factor correction type PWM controller by voltage stabilizing loop and current-limiting protection circuit; Power factor correction type PWM controller inserts the input overvoltage/undervoltage protected location that output connects from the input rectifying filter circuit; have access to special short-circuit protection circuit in addition, the output of PWM controller then is connected to power conversion circuit and then realizes the feedback control of whole power circuit operating state.The secondary of isolating transformer that the LED fluorescent lamp metal shell that above-mentioned isolated component can touch the people is simultaneously received the isolation power conversion circuit goes up safely, thereby make to adopt and to bear up to the 3000V high pressure not breakdownly between the metal shell of input high-voltage line to people's contact of LED fluorescent lamp of this power circuit, really meet the security regulations requirement of national two kind equipments.
Referring to Fig. 2 is the specific embodiment circuit diagram, lower left corner CN1 is a way circuit ac voltage signal input interface among the figure, external communication voltage enters by fuse MOV1 after the CN1 input, capacitor C 5, the EMI unit that inductance L 1 constitutes, then through one tunnel process resistance R 16 behind the input rectifying filter circuit rectifying and wave-filtering of diode D1-D4 and capacitor C 7 compositions, R19, R22 enters power factor correction type PWM chip U1 the 5th pin of input overvoltage/undervoltage protected location, another road enters transformer T1 elementary of the isolated form Power Conversion of input in the left side, by transformer T1, PWM chip U1 and field effect transistor Q1 and peripheral element carry out the isolated form Power Conversion; Power factor correction type PWM chip U1 the 1st pin is accepted the secondary voltage current signal of low-voltage safety by PH1 and is handled, by changing the switching frequency that the 7th pin changes field effect transistor Q1, to reach the stable and controlled of output voltage electric current; The 4th pin of power factor correction type PWM chip U1 is realized the short-circuit protection control of entire circuit by R27, R44, R45, R46, PWM chip U1, thyristor U3, resistance R 5, R9, R10, R12, capacitor C 9, C11, C12, and light isolated component PH1,2 pin form the voltage stabilizing loop, by isolated component PH1 voltage signal is fed back to the 1st pin of power factor correction type PWM chip U1, to realize the constant voltage output of circuit; And the current-limiting protection circuit that PWM chip U1, thyristor U2 and peripheral element are formed also is with 1st pin of current signal to power factor correction type PWM chip U1, with constant current output and the current-limiting protection control that realizes circuit by isolated component PH1.
It is to be noted; the utility model is not limited to above-mentioned execution mode; any simple modification, equivalent variations and modification that any those skilled in the art do the foregoing description in based on technical solutions of the utility model all belong in the protection range of the present utility model.
Claims (4)
1, a kind of isolated High Power Factor LED fluorescent lamp driving power supply, it comprises EMI unit, input rectifying filter circuit, power conversion circuit, the output rectifier and filter composition that links to each other successively, it is characterized in that: also be provided with power factor correction type PWM controller between power conversion circuit and output rectifier and filter; Described power conversion circuit is the isolated form power conversion circuit; Described output rectifier and filter is connected into power factor correction type PWM controller by isolated component, voltage stabilizing loop, and the output of power factor correction type PWM controller connects power conversion circuit.
2, isolated High Power Factor LED fluorescent lamp driving power supply as claimed in claim 1 is characterized in that: described input rectifying filter circuit output is connected with input overvoltage/undervoltage protected location and is connected into power factor correction type PWM controller.
3, isolated High Power Factor LED fluorescent lamp driving power supply as claimed in claim 1 is characterized in that: also be provided with current-limiting protection circuit between described isolated component and power factor correction type PWM controller.
4, isolated High Power Factor LED fluorescent lamp driving power supply as claimed in claim 3 is characterized in that: described power factor correction type PWM controller has also been imported short-circuit protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506091U CN201426195Y (en) | 2009-04-28 | 2009-04-28 | Isolated high-power factor driving power source for LED fluorescent lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506091U CN201426195Y (en) | 2009-04-28 | 2009-04-28 | Isolated high-power factor driving power source for LED fluorescent lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201426195Y true CN201426195Y (en) | 2010-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201506091U Expired - Lifetime CN201426195Y (en) | 2009-04-28 | 2009-04-28 | Isolated high-power factor driving power source for LED fluorescent lamps |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076153A (en) * | 2011-01-26 | 2011-05-25 | 常州家加爱光电科技有限公司 | Constant-current adjustable power supply |
| CN102215617A (en) * | 2010-04-09 | 2011-10-12 | 复旦大学 | Partition type driving circuit for general lighting LED (light emitting diode) street lamp |
-
2009
- 2009-04-28 CN CN2009201506091U patent/CN201426195Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215617A (en) * | 2010-04-09 | 2011-10-12 | 复旦大学 | Partition type driving circuit for general lighting LED (light emitting diode) street lamp |
| CN102076153A (en) * | 2011-01-26 | 2011-05-25 | 常州家加爱光电科技有限公司 | Constant-current adjustable power supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100317 |
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| CX01 | Expiry of patent term |