CN104039043A - Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit - Google Patents
Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit Download PDFInfo
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- CN104039043A CN104039043A CN201410241983.8A CN201410241983A CN104039043A CN 104039043 A CN104039043 A CN 104039043A CN 201410241983 A CN201410241983 A CN 201410241983A CN 104039043 A CN104039043 A CN 104039043A
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- 238000001914 filtration Methods 0.000 claims abstract description 24
- 230000006837 decompression Effects 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 230000001052 transient effect Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 7
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Abstract
The invention relates to a non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit. A capacitor is adopted to reduce voltage first and then divide the voltage, input alternating current voltage and output power change linearly by utilizing capacitive reactance, the ripple of the direct current voltage output by a voltage dividing rectification circuit is small, and the capacity of a filtering capacitor is small. A non-polar capacitor voltage reducing and dividing rectification linear LED driving circuit has the advantages of being simple in structure, low in cost, small in size, high in power factor and efficiency and long in service life. The LED driving circuit is simplified, a driving requirement of the LED is met, a non-polar capacitor is utilized to replace an electrolytic capacitor, capacitor loss is reduced, and the service life of the driving power supply is prolonged. A dimming variable resistor is provided to achieve brightness adjustment of an LED group, the shortcomings of low power factor and efficiency and no dimming of a capacitance-resistance pressure reducing type LED driving power supply are overcome, the driving power supply is especially suitable for driving LED lamps with the power ranging from 3 to 20 watts and is an improved product of the existing capacitance-resistance LED lamp driving power supply.
Description
Technical field
The present invention relates to the current transformer of electrical technology field, be that one utilizes non-polar condenser to fall the linear LED drive circuit of dividing potential drop rectification concretely, specially refer to and utilize power electronic technology control capacitor alternating current to be fallen to the LED drive circuit of the linear output of partial pressure type rectification.
Background technology
Compare with traditional incandescent lamp, fluorescent lamp and commercially available electricity-saving lamp, LED illuminating lamp has obvious advantage in many-sides such as luminous efficiency, energy-conserving and environment-protective and useful lifes, is therefore described as the most promising green light source of 21st century.Based on the consideration of efficiency and volume angle, existing LED illuminating lamp adopts constant-current switch power source and capacitance-resistance pressure drop as drive circuit more.The switching frequency of constant-current switch power source is generally in 20-100 kilocycle, the useful life of its main filtering device electrolytic capacitor is very limited, generally only have several ten thousand hours, and reduce useful life along with the rising of temperature, the electrolytic capacitor of working under the maximum temperature allowing, only have hundreds to about 1,000 hours useful life.In practical work process, the high order large ripple current impact of Switching Power Supply and the dielectric loss of electrolyte and pole plate, cause the temperature of electrolytic capacitor to raise.In integrated LED illuminating lamp, the temperature rise of LED lamp pearl, the phenomenon that makes electrolytic capacitor work in hot environment is particularly serious.On the other hand, the driving voltage of LED illuminating lamp and the relation of electric current are not simple linear relationship, change but be exponential relationship.Under the condition of rated current and rated temperature, work, can reach the useful life of LED illuminating lamp more than 50,000 hours, apparent, existing LED drive circuit did not mate with the useful life of LED illuminating lamp, and this has seriously restricted the develop rapidly of LED illuminating lamp.And though the drive circuit capacitance-resistance pressure drop of another kind of LED illuminating lamp has simple in structure, low cost and other advantages, but be subject to the restriction of volume and efficiency,, power and power factor (0.2 left and right) low, and there is the shortcoming that can not carry out to LED illuminating lamp light modulation, also cannot meet the demand of LED illumination market.
LED illumination market develops into tens to several hectowatts by several watts of power at present, and the power being most widely used is at three to 20 watts.Patent application (201310495516.3) is although adopt capacitance partial pressure rectification, but the voltage-current characteristic of LED causes input ac voltage and power output to present exponential relationship to be changed, in the time that input ac voltage changes, the power output of LED illuminating lamp changes greatly, has had a strong impact on the stability of LED illuminating lamp; And employing electrolytic capacitor, causes circuit complexity, useful life short.As can be seen here, finding a kind of LED illuminating lamp energy saving driving circuit simple in structure, that cost is low is current power electronic technology field problem urgently to be resolved hurrily.
Summary of the invention
For the deficiencies in the prior art, the technical problem to be solved in the present invention is: provide a kind of non-polar condenser to fall the linear LED drive circuit of dividing potential drop rectification.The impedance that capacitive reactance when this power utilization capacitor step-down produces, the AC-input voltage of realization to LED load and the linearity output of DC output power, prevent that LED illuminating lamp from damaging because the variation of input ac voltage causes current break, the requirement driving to adapt to LED illuminating lamp; Owing to adopting capacitance partial pressure rectification, reduce the galvanic ripple of output, and then reduced the capacity of filtering capacitor; Substitute electrolytic capacitor by ordinary capacitor and carry out filtering, improved the useful life of LED illuminating lamp.
The alternating current place in circuit of operation principle of the present invention: 220V50Hz, after the filter circuit filtering and decompression capacitor step-down of filtering capacitor, first current-limiting resistance and decompression capacitor composition, be rectified into Rectified alternating current by rectifier bridge, through isolating diode, charging diode and second current-limiting resistance, first capacitor and second capacitor are carried out to tandem charging, first capacitor powered to load LED lamp group simultaneously; When alternating current voltage is during lower than output dc voltage, the driving resistance of direct current in drive circuit, the conducting of driving power switching device, is discharged in first capacitor through discharge diode and second current-limiting resistance being stored in second electric charge in capacitor; When input ac voltage is during higher than output dc voltage, device for power switching turn-offs.
Job step and the physical process of this circuit are: alternating current is after first current-limiting resistance and decompression capacitor step-down, be rectified into Rectified alternating current by rectifier bridge, through isolating diode, charging diode and second current-limiting resistance, first capacitor and second capacitor are carried out to serial connection charge again, first capacitor is simultaneously to LED lamp group load supplying; When input ac voltage is lower than the output voltage of first capacitor, the cathode voltage of isolating diode is timing, the control utmost point of device for power switching obtains driving voltage and conducting, control second capacitor through discharge diode and second current-limiting resistance to first discharging capacitors; In the time that the reverse voltage of isolating diode drops to lower than device for power switching gate turn-off voltage, device for power switching turn-offs, and the both end voltage of first capacitor is as output voltage; The capacitive reactance being produced by decompression capacitor has limited the electric current that flows through load LED group, reach input ac voltage change within the specific limits with power output linear, the damage that the current break of having avoided LED illuminating lamp to produce because both end voltage changes causes.
The technical solution adopted for the present invention to solve the technical problems is, a kind of non-polar condenser fall the linear LED drive circuit of dividing potential drop rectification by input L and N, step-down rectifying circuit, bleeder circuit, output+and-, load (luminous tube group) DZ forms.Described step-down rectifying circuit is made up of filtering capacitor C4 and C5, first current-limiting resistance RX1, overvoltage protection transient absorption elements T VS, decompression capacitor C1, discharge resistance R1 and rectifier bridge DL; Described bleeder circuit by discharge diode D1, charging diode D2 and isolating diode D3, first capacitor C2 and second capacitor C3, drive resistance R 2 and discharge resistance R 3, voltage stabilizing didoe DW, device for power switching BG1 and second current-limiting resistance RX2 and form.
In such scheme, described discharge resistance R1, for discharging and be stored in electric charge in decompression capacitor C1 when alternating current circuit disconnecting, prevents that when alternating current from connecting again, supply voltage superposes with the voltage of decompression capacitor C1 storage and the interior device of damage circuit.
In such scheme, described voltage stabilizing didoe DW is that the control pole tension for protecting device for power switching BG1 is no more than normal use voltage, discharges resistance R 3 and is used for delivered power switching device BG1 and controls electric charge between the utmost point and negative electrode.
In such scheme, described device for power switching can be the one in triode, field effect transistor and IGBT.
The power that falls the linear LED drive circuit of dividing potential drop rectification when described non-polar condenser is greater than 7 watt-hours, and in order to reduce the wastage, current-limiting resistance RX1 and RX2 application inductance substitute.
It is as follows that each circuit connecting relation of the linear LED drive circuit of dividing potential drop rectification falls in a kind of non-polar condenser: input L is connected to the one end of the filtering capacitor C4 in step-down rectifying circuit and one end of current-limiting resistance RX1, one end of the other end of current-limiting resistance RX1 and filtering capacitor C5, one end of overvoltage protection transient absorption elements T VS, decompression capacitor C1 is connected with the one end after discharge resistance R1 parallel connection, an input of the other end of decompression capacitor C1 and rectifier bridge DL joins, the other end of input N and filtering capacitor C4, the other end of filtering capacitor C5, the other end of overvoltage protection transient absorption elements T VS and another input of rectifier bridge DL are connected, the one end of resistance R X2 in bleeder circuit, drive the positive output end of the rectifier bridge DL in one end of resistance R 2 and negative pole and the step-down rectifying circuit of discharge diode D1 to join, the other end of the driving resistance R 2 in cathode output end and the bleeder circuit of the rectifier bridge DL in step-down rectifying circuit, after voltage stabilizing didoe DW and isolating diode D3 reverse parallel connection again with discharge resistance R 3 one end in parallel, the control utmost point of the negative pole of isolating diode D3 and device for power switching BG1 is connected, the other end of current-limiting resistance RX2 in bleeder circuit is connected with output+utmost point with one end of capacitor C2, the positive pole of discharge diode D1 is connected with one end of capacitor C3 with the negative pole of charging diode D2, the other end of capacitor C3 is connected with the negative electrode of device for power switching BG1 with the positive pole of isolating diode D3, output-anode of the utmost point and device for power switching BG1, the positive pole of charging diode D2 is connected with the other end of capacitor C2, output+and-both positive and negative polarity of the utmost point and load (luminous tube group) DZ joins.
Beneficial effect of the present invention is, owing to adopting capacitor step-down, utilizes the capacitive reactance of capacitor, and making input voltage and power output is linear relationship; Adopt the rectification of capacitor dividing potential drop, reduced direct current output ripple voltage, and then reduced existing output filter capacitor capacity, improved operating efficiency and power factor; Step-down is combined with dividing potential drop, has improved power factor and efficiency, has extended the useful life of LED illuminating lamp, has dwindled the volume of circuit.Be greater than the alternative resistance-capacitance type LED drive circuit energy-saving effect of three to 20 watt-hours at power more obvious.
Brief description of the drawings
The linear LED drive circuit schematic diagram of dividing potential drop rectification falls in Fig. 1 non-polar condenser
Number in the figure:
1. step-down rectifying circuit
2. bleeder circuit
The linear LED drive circuit schematic diagram of dividing potential drop rectification falls in Fig. 2 Light modulating type non-polar condenser
Number in the figure:
1. step-down rectifying circuit
2. bleeder circuit
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further details.
The present invention is that the linear LED drive circuit of dividing potential drop rectification falls in a kind of non-polar condenser, and Fig. 1 is that the linear LED drive circuit schematic diagram of dividing potential drop rectification falls in non-polar condenser.This power supply by input L and N, step-down rectifying circuit 1, bleeder circuit 2, output+and-, load (luminous tube group) DZ forms.Described step-down rectifying circuit 1 is made up of filtering capacitor C4 and C5, current-limiting resistance RX1, overvoltage protection transient absorption elements T VS, decompression capacitor C1, discharge resistance R1 and rectifier bridge DL; Described bleeder circuit 2 is by discharge diode D1, charging diode D2 and isolating diode D3, capacitor C2 and C3, driving resistance R 2 and discharge resistance R 3, voltage stabilizing didoe DW, device for power switching BG1 and current-limiting resistance RX2 and form.
Each circuit connecting relation of this power supply is as follows: input L is connected to the one end of the filtering capacitor C4 in step-down rectifying circuit and one end of current-limiting resistance RX1, one end of the other end of current-limiting resistance RX1 and filtering capacitor C5, one end of overvoltage protection transient absorption elements T VS, decompression capacitor C1 is connected with the one end after discharge resistance R1 parallel connection, an input of the other end of decompression capacitor C1 and rectifier bridge DL joins, the other end of input N and filtering capacitor C4, the other end of filtering capacitor C5, the other end of overvoltage protection transient absorption elements T VS and another input of rectifier bridge DL are connected, the one end of resistance R X2 in bleeder circuit, drive the positive output end of the rectifier bridge DL in one end of resistance R 2 and negative pole and the step-down rectifying circuit of discharge diode D1 to join, the other end of the driving resistance R 2 in cathode output end and the bleeder circuit of the rectifier bridge DL in step-down rectifying circuit, after voltage stabilizing didoe DW and isolating diode D3 reverse parallel connection again with discharge resistance R 3 one end in parallel, the control utmost point of the negative pole of isolating diode D3 and device for power switching BG1 is connected, the other end of current-limiting resistance RX2 in bleeder circuit is connected with output+utmost point with one end of capacitor C2, the positive pole of discharge diode D1 is connected with one end of capacitor C3 with the negative pole of charging diode D2, the other end of capacitor C3 is connected with the negative electrode of device for power switching BG1 with the positive pole of isolating diode D3, output-anode of the utmost point and device for power switching BG1, the positive pole of charging diode D2 is connected with the other end of capacitor C2, output+and-both positive and negative polarity of the utmost point and load (luminous tube group) DZ joins.
When work; input L and N access civil power alternating current; alternating current is via the filter circuit filtering of filtering capacitor C4 and C5, current-limiting resistance RX1 composition; through transient state, two-way absorption diode TVS carries out after overvoltage protection; supply with decompression capacitor C1 and carry out step-down; carry out full-wave rectification through rectifier bridge DL again, the Rectified alternating current after rectification is exported by rectifier bridge DL
+ the utmost pointflow through current-limiting resistance RX2, capacitor C2, charging diode D2, capacitor C3, isolating diode D3 forms loop to a utmost point of rectifier bridge DL output, capacitor C2 and C3 carried out to partial pressure type charging and power to load DZ simultaneously.When the charging voltage after AC rectification is during lower than VD, through driving resistance R 2 poor at negative pole and the anodal two ends generation reverse voltage of isolating diode D3, driving power switching device BG1 conducting, the electric charge that is stored in capacitor C3 when BG1 conducting discharges to capacitor C2 and load DZ through discharge diode D1, current-limiting resistance RX2.When the voltage after AC rectification is during higher than VD, device for power switching BG1 turn-offs.Along with the variation of alternating voltage cycle, conducting and shutoff have realized the automatic dividing potential drop rectification of output dc voltage to device for power switching BG1.
Fig. 2 utilizes the Light modulating type non-polar condenser that the present invention makes to fall the linear LED drive circuit schematic diagram of dividing potential drop rectification, in figure, fall in the linear LED drive circuit of dividing potential drop rectification variable resistor W is set at described non-polar condenser, for load DZ output voltage is regulated, realize the object that load DZ LED lamp group is carried out to light modulation.
The present invention adopts capacitor step-down, makes drive circuit input voltage and power output be linear change, and the direct voltage ripple of capacitance partial pressure rectification circuit output is little, and then filtering capacitor capacity is little, can use common non-polar condenser.Make non-polar condenser with the present invention and fall the linear LED drive circuit of dividing potential drop rectification, have simple in structure, cost is low, volume is little, power factor (0.65-0.83) and the advantage such as efficiency is high, the life-span is grown; Within the scope of certain input ac voltage, because input voltage and the power output of LED drive circuit are linear, and then simplify LED drive circuit, adapt to the driving requirement of LED luminous tube; With the alternative electrolytic capacitor of non-polar condenser, not only reduce condenser loss, and improved the useful life of drive circuit; Be provided with light modulation variable resistor and realized the brightness regulation to LED lamp group, overcome the shortcoming that capacitance-resistance pressure-decreasing type LED drive circuit can not light modulation, especially being applicable to power driving LED illuminating lamp in the power bracket of three to 20 watts, is the improved products of existing resistance-capacitance type LED illuminating lamp driving circuit.
Claims (4)
1. the linear LED drive circuit of dividing potential drop rectification falls in a non-polar condenser, it is characterized in that: alternating current is after first current-limiting resistance and decompression capacitor step-down, be rectified into Rectified alternating current by rectifier bridge, through isolating diode, charging diode and second current-limiting resistance, first capacitor and second capacitor are carried out to serial connection charge again, first capacitor is simultaneously to LED lamp group load supplying; When input ac voltage is lower than the output voltage of first capacitor, the cathode voltage of isolating diode is timing, the control utmost point of device for power switching obtains driving voltage and conducting, control second capacitor through discharge diode and second current-limiting resistance to first discharging capacitors; In the time that the reverse voltage of isolating diode drops to lower than device for power switching gate turn-off voltage, device for power switching turn-offs, and the both end voltage of first capacitor is as output voltage; The capacitive reactance being produced by decompression capacitor has limited the electric current that flows through load LED group, reach input ac voltage change within the specific limits with power output linear, the damage that the current break of having avoided LED illuminating lamp to produce because both end voltage changes causes.
2. the linear LED drive circuit of dividing potential drop rectification falls in a kind of non-polar condenser according to claim 1, it is characterized in that: this circuit by input L and N, step-down rectifying circuit (1), bleeder circuit (2), output+and-, load (luminous tube group) DZ forms, described step-down rectifying circuit (1) is made up of filtering capacitor C4 and C5, first current-limiting resistance RX1, overvoltage protection transient absorption elements T VS, decompression capacitor C1, discharge resistance R1 and rectifier bridge DL, described bleeder circuit (2) by discharge diode D1, charging diode D2 and isolating diode D3, first capacitor C2 and second capacitor C3, drive resistance R 2 and discharge resistance R 3, voltage stabilizing didoe DW, device for power switching BG1 and second current-limiting resistance RX2 and form, it is as follows that each circuit connecting relation of the linear LED drive circuit of dividing potential drop rectification falls in a kind of non-polar condenser: input L is connected to one end of filtering capacitor C4 and the one end of current-limiting resistance RX1 in step-down rectifying circuit (1), one end of the other end of current-limiting resistance RX1 and filtering capacitor C5, one end of overvoltage protection transient absorption elements T VS, decompression capacitor C1 is connected with the one end after discharge resistance R1 parallel connection, an input of the other end of decompression capacitor C1 and rectifier bridge DL joins, the other end of input N and filtering capacitor C4, the other end of filtering capacitor C5, the other end of overvoltage protection transient absorption elements T VS and another input of rectifier bridge DL are connected, the one end of resistance R X2 in bleeder circuit (2), drive the positive output end of the rectifier bridge DL in one end of resistance R 2 and the negative pole of discharge diode D1 and step-down rectifying circuit (1) to join, the other end of the driving resistance R 2 in cathode output end and the bleeder circuit (2) of the rectifier bridge DL in step-down rectifying circuit (1), after voltage stabilizing didoe DW and isolating diode D3 reverse parallel connection again with discharge resistance R 3 one end in parallel, the control utmost point of the negative pole of isolating diode D3 and device for power switching BG1 is connected, the other end of current-limiting resistance RX2 and one end of capacitor C2 in bleeder circuit (2) are connected with output+utmost point, the positive pole of discharge diode D1 is connected with one end of capacitor C3 with the negative pole of charging diode D2, the other end of capacitor C3 is connected with the negative electrode of device for power switching BG1 with the positive pole of isolating diode D3, output-anode of the utmost point and device for power switching BG1, the positive pole of charging diode D2 is connected with the other end of capacitor C2, output+and-both positive and negative polarity of the utmost point and load (luminous tube group) DZ joins.
3. the linear LED drive circuit of dividing potential drop rectification falls in non-polar condenser according to claim 1, it is characterized in that: the power of driving power is greater than 7 watt-hours, and in order to reduce the wastage, current-limiting resistance RX1 and RX2 application inductance substitute.
4. the linear LED drive circuit of dividing potential drop rectification falls in non-polar condenser according to claim 1, it is characterized in that: variable resistor W is set, for load DZ output voltage is mediated, realizes the object that load DZ LED group is carried out to light modulation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410241983.8A CN104039043A (en) | 2014-05-30 | 2014-05-30 | Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit |
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| CN201410241983.8A CN104039043A (en) | 2014-05-30 | 2014-05-30 | Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit |
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| CN104039043A true CN104039043A (en) | 2014-09-10 |
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| CN201410241983.8A Pending CN104039043A (en) | 2014-05-30 | 2014-05-30 | Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100392A (en) * | 2016-06-12 | 2016-11-09 | 芜湖锐芯电子科技有限公司 | Eliminate working frequency ripple wave high efficiency high power factor AC/DC power circuit and method of supplying power to thereof and control method |
| CN107219389A (en) * | 2017-05-27 | 2017-09-29 | 重庆编福科技有限公司 | One kind compensates stealing formula transmitter based on Darlington optocoupler from ring |
| CN111479354A (en) * | 2019-01-04 | 2020-07-31 | 一统光电（江苏）有限公司 | Interference-free low-cost long-life L ED power supply directly using mains supply and L ED lighting appliance thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120161650A1 (en) * | 2010-12-22 | 2012-06-28 | Tsorng-Juu Liang | Led driver circuit |
| CN103501120A (en) * | 2013-10-18 | 2014-01-08 | 李香龙 | Capacitor type rectifying and step-down voltage regulator circuit |
| CN203537623U (en) * | 2013-10-18 | 2014-04-09 | 河北工业大学 | LED driving power supply |
-
2014
- 2014-05-30 CN CN201410241983.8A patent/CN104039043A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120161650A1 (en) * | 2010-12-22 | 2012-06-28 | Tsorng-Juu Liang | Led driver circuit |
| CN103501120A (en) * | 2013-10-18 | 2014-01-08 | 李香龙 | Capacitor type rectifying and step-down voltage regulator circuit |
| CN203537623U (en) * | 2013-10-18 | 2014-04-09 | 河北工业大学 | LED driving power supply |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100392A (en) * | 2016-06-12 | 2016-11-09 | 芜湖锐芯电子科技有限公司 | Eliminate working frequency ripple wave high efficiency high power factor AC/DC power circuit and method of supplying power to thereof and control method |
| CN107219389A (en) * | 2017-05-27 | 2017-09-29 | 重庆编福科技有限公司 | One kind compensates stealing formula transmitter based on Darlington optocoupler from ring |
| CN107219389B (en) * | 2017-05-27 | 2019-12-03 | 重庆编福科技有限公司 | One kind compensating stealing formula transmitter from ring based on Darlington optocoupler |
| CN111479354A (en) * | 2019-01-04 | 2020-07-31 | 一统光电（江苏）有限公司 | Interference-free low-cost long-life L ED power supply directly using mains supply and L ED lighting appliance thereof |
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