CN103944394A - LED switching power supply controller integrated circuit - Google Patents
LED switching power supply controller integrated circuit Download PDFInfo
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- CN103944394A CN103944394A CN201410115570.5A CN201410115570A CN103944394A CN 103944394 A CN103944394 A CN 103944394A CN 201410115570 A CN201410115570 A CN 201410115570A CN 103944394 A CN103944394 A CN 103944394A
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Abstract
The invention relates to the technical field of switching power supplies, in particular to an LED switching power supply controller integrated circuit which comprises an EMI filter circuit connected with alternating current, a rectifier bridge, a CBB capacitor C1, a power factor correction circuit, a PWM control chip and a switching transformer and has the advantages of high efficiency and reasonable circuit.
Description
Technical field
The present invention relates to switch power technology field, relate in particular to LED switch power controller integrated circuit.
Background technology
LED, as novel energy-conserving light source, has the features such as light efficiency is high, environmental protection, life-span length.It is that power supply supply is converted to specific electric current and voltage with the luminous power supply changeover device of driving LED that LED needs the driving power LED driving power of constant current output while use, under normal circumstances, the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, high voltage direct current, low pressure high-frequency ac etc.LED driving power belongs to Switching Power Supply, and the quality and reliability of Switching Power Supply depends on its circuit design, production technology, and the quality of device, and meanwhile, LED driving power directly affects the useful life of LED.But often there is the shortcoming of inefficient and unreasonable circuit structure in existing LED driving power.
Summary of the invention
The object of the invention is to provide for the deficiencies in the prior art a kind of high efficiency and rational LED switch power controller integrated circuit.
For achieving the above object, the present invention adopts following technical scheme: LED switch power controller integrated circuit, it comprises the EMI filter circuit that connects alternating current, and rectifier bridge, CBB capacitor C 1, circuit of power factor correction, pwm chip and switch transformer; Described switch transformer comprises switching tube Q1, armature winding N1, secondary winding N2, rectifier diode VD1, capacitor C 2, resistance R 3 and capacitor C 7, described secondary winding N2 connects rectifier diode VD1 and capacitor C 2, and described resistance R 3 and capacitor C 7 are in parallel with rectifier diode VD1; The output of described EMI filter circuit connects the input of rectifier bridge, the output of rectifier bridge connects respectively CBB capacitor C 1, circuit of power factor correction and armature winding N1, the leakage level of armature winding N1 connecting valve pipe Q1, is connected with sampling resistor R2 between the source electrode of switching tube Q1 and ground; The output contact resistance R1 of rectifier bridge, resistance R 1 connects pwm chip so that starting current to be provided, the grid of the pulse output end connecting valve pipe Q1 of pwm chip.
Further, the input of described EMI filter circuit is connected with fuse F1, and fuse F1 connects alternating current.
Further, the input of described EMI filter circuit is connected with thermistor RT1, and thermistor RT1 connects alternating current.
Beneficial effect of the present invention is: LED switch power controller integrated circuit of the present invention comprises the EMI filter circuit that connects alternating current, and rectifier bridge, CBB capacitor C 1, circuit of power factor correction, pwm chip and switch transformer, there is the rational advantage of high efficiency and circuit.
Brief description of the drawings
Accompanying drawing 1 is schematic block circuit diagram of the present invention.
Accompanying drawing 2 is switch transformer circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated: as depicted in figs. 1 and 2, LED switch power controller integrated circuit of the present invention, it comprises the EMI filter circuit that connects alternating current, and rectifier bridge, CBB capacitor C 1, circuit of power factor correction, pwm chip and switch transformer; Described switch transformer comprises switching tube Q1, armature winding N1, secondary winding N2, rectifier diode VD1, capacitor C 2, resistance R 3 and capacitor C 7, described secondary winding N2 connects rectifier diode VD1 and capacitor C 2, and described resistance R 3 and capacitor C 7 are in parallel with rectifier diode VD1; The output of described EMI filter circuit connects the input of rectifier bridge, the output of rectifier bridge connects respectively CBB capacitor C 1, circuit of power factor correction and armature winding N1, the leakage level of armature winding N1 connecting valve pipe Q1, is connected with sampling resistor R2 between the source electrode of switching tube Q1 and ground; The output contact resistance R1 of rectifier bridge, resistance R 1 connects pwm chip so that starting current to be provided, the grid of the pulse output end connecting valve pipe Q1 of pwm chip.Further, the input of described EMI filter circuit is connected with fuse F1, and fuse F1 connects alternating current.
Preferably, the input of described EMI filter circuit is connected with thermistor RT1, thermistor RT1 connects alternating current, thermistor RT1 can prevent that surge current from causing damage to device below, in the time that power supply is not also switched on, the resistance of thermistor RT1 is very large, so can play the effect of limit inrush currents, when after the normal work of circuit, thermistor RT1 is owing to there being electric current to pass through to generate heat, cause resistance can become very little, so after normal work, the power loss of thermistor RT1 is very little.
When work, when after alternating current input circuit, after fuse and the rectification of EMI filter circuit, through passing through again 1 filtering of CBB capacitor C after rectifier bridge filtering, then pass through circuit of power factor correction, power factor is improved.Electric current arrives ground through armature winding N1, switching tube Q1 and sampling resistor R2 afterwards, forms the major loop of power input.Realize constant current control by the electric current of controlling major loop, concrete method is, by sampling resistor R2, the current signal of input is converted into voltage signal, and the duty that feeds back to the pin adjustment chip output pulse of pwm chip is recently realized.The core that power supply is realized constant current control is pwm chip, and resistance R 1 connects pwm chip so that starting current to be provided.The grid of the pulse output end of pwm chip and switching tube Q1, with conducting and the cut-off of the grid of control switch pipe Q1.Input voltage is through after switch transformer transformation, through being exported by capacitor C 2 filtering after supper-fast recovery rectifier diode VD1 rectification again.Because rectifier diode VD1 is in the on off state of high frequency when the circuit working, resistance R 3 and capacitor C 7 produce vibration with avoiding rectifier diode VD1.LED switch power controller integrated circuit of the present invention has high efficiency and the rational advantage of circuit.
The above is only preferred embodiments of the present invention, and the equivalence of doing according to structure, feature and principle described in patent claim of the present invention therefore all changes or modifies, and is included in patent claim of the present invention.
Claims (3)
1.LED switch power controller integrated circuit, is characterized in that: it comprises the EMI filter circuit that connects alternating current, and rectifier bridge, CBB capacitor C 1, circuit of power factor correction, pwm chip and switch transformer; Described switch transformer comprises switching tube Q1, armature winding N1, secondary winding N2, rectifier diode VD1, capacitor C 2, resistance R 3 and capacitor C 7, described secondary winding N2 connects rectifier diode VD1 and capacitor C 2, and described resistance R 3 and capacitor C 7 are in parallel with rectifier diode VD1; The output of described EMI filter circuit connects the input of rectifier bridge, the output of rectifier bridge connects respectively CBB capacitor C 1, circuit of power factor correction and armature winding N1, the leakage level of armature winding N1 connecting valve pipe Q1, is connected with sampling resistor R2 between the source electrode of switching tube Q1 and ground; The output contact resistance R1 of rectifier bridge, resistance R 1 connects pwm chip so that starting current to be provided, the grid of the pulse output end connecting valve pipe Q1 of pwm chip.
2. LED switch power controller integrated circuit according to claim 1, is characterized in that: the input of described EMI filter circuit is connected with fuse F1, and fuse F1 connects alternating current.
3. LED switch power controller integrated circuit according to claim 1, is characterized in that: the input of described EMI filter circuit is connected with thermistor RT1, and thermistor RT1 connects alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115570.5A CN103944394A (en) | 2014-03-26 | 2014-03-26 | LED switching power supply controller integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410115570.5A CN103944394A (en) | 2014-03-26 | 2014-03-26 | LED switching power supply controller integrated circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103944394A true CN103944394A (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410115570.5A Pending CN103944394A (en) | 2014-03-26 | 2014-03-26 | LED switching power supply controller integrated circuit |
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| CN (1) | CN103944394A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109196952A (en) * | 2016-04-25 | 2019-01-11 | 卢特龙电子公司 | Load control device for LED source |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202005042U (en) * | 2011-04-07 | 2011-10-05 | 昂宝电子（上海）有限公司 | Novel light-emitting diode (LED) drive circuit with high power factor |
| CN202385338U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED drive power supply |
| CN203136274U (en) * | 2013-03-15 | 2013-08-14 | 田津龙 | High-power-factor LED drive power supply circuit of AP3770 chip |
| CN203883679U (en) * | 2014-03-26 | 2014-10-15 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
-
2014
- 2014-03-26 CN CN201410115570.5A patent/CN103944394A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202005042U (en) * | 2011-04-07 | 2011-10-05 | 昂宝电子（上海）有限公司 | Novel light-emitting diode (LED) drive circuit with high power factor |
| CN202385338U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED drive power supply |
| CN203136274U (en) * | 2013-03-15 | 2013-08-14 | 田津龙 | High-power-factor LED drive power supply circuit of AP3770 chip |
| CN203883679U (en) * | 2014-03-26 | 2014-10-15 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109196952A (en) * | 2016-04-25 | 2019-01-11 | 卢特龙电子公司 | Load control device for LED source |
| CN109196952B (en) * | 2016-04-25 | 2021-06-18 | 路创技术有限责任公司 | Load Control Device for Light Emitting Diode Light Sources |
| US12082322B2 (en) | 2016-04-25 | 2024-09-03 | Lutron Technology Company Llc | Load control device for a light-emitting diode light source |
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Application publication date: 20140723 |