CN103200725B - Piezo-electric resonance type LED driving circuit - Google Patents
Piezo-electric resonance type LED driving circuit Download PDFInfo
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- CN103200725B CN103200725B CN201210001857.6A CN201210001857A CN103200725B CN 103200725 B CN103200725 B CN 103200725B CN 201210001857 A CN201210001857 A CN 201210001857A CN 103200725 B CN103200725 B CN 103200725B
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Abstract
The invention provides a kind of piezo-electric resonance type LED driving circuit, its ac voltage rectifier utilizing rectifier to be provided by one civil power is direct voltage, direct voltage is made resonance to produce an inductive current by recycling quasi-resonant switching module, wherein the frequency of resonance can be promoted to the frequency of operation of piezo-electric resonator, finally inductive current is given after resonator, filter through piezo-electric resonator, make it produce a string ripple electric current, string ripple electric current exportable direct current after rectification drives light-emitting diode (LED) module.
Description
Technical field
The present invention is relevant a kind of piezo-electric resonance type LED driving circuit, refers to that one utilizes single active switch to arrange in pairs or groups traveling wave thin piezoelectric resonator to drive light-emitting diode especially.
Background technology
The oil price joint joint promotion in the world now, the supply of the energy and raw material becomes most important subject under discussion, how conservation of power and save consumptive material, is the common-denominator target of industry science and technology, wherein account for the lighting apparatus of energy resource consumption significant proportion, become energy-conservation big event.Photoelectric cell due to light-emitting diode has high color saturation, without mercury, the life-span is long, Quick-Point goes out, high brightness, little power consumption and the advantage such as compact, at present generally use light-emitting diode as lighting apparatus.
Use at present mostly piezoelectric transformer to drive circuit of LED, be after direct voltage by AC power through rectification, provide generation square-wave voltage through full-bridge or half-bridge power amplifier; Square-wave voltage is by the resonance of external inductance and piezoelectric transformer input capacitance, voltage transitions is carried out to obtain laterally zygomorphic accurate string ripple electric current input piezoelectric transformer, the alternating current rectification exported by piezoelectric transformer finally by rectifier, after direct current, is driven light-emitting diode.But using the full-bridge design of four switches or using the half-bridge of biswitch not only allow increases circuit cost and volume, and the comparatively complexity that circuit-line design is also relative.Therefore, how to allow circuit simplify can reach again identical LED driving circuit usefulness is problem demanding prompt solution.
In view of this, the present invention then for the disappearance of above-mentioned prior art, proposes a kind of piezo-electric resonance type LED driving circuit, effectively to overcome the above-mentioned problem such as described.
Summary of the invention
Main purpose of the present invention is providing a kind of piezo-electric resonance type LED driving circuit, it utilizes Single switch to replace the half bridge designs of existing used biswitch, not only can reach zero voltage switching and effectively reduce switching loss when resonance, also can reduce effect of circuit cost.
In order to achieve the above object, the invention provides a kind of piezo-electric resonance type LED driving circuit, comprise a rectifier, a quasi-resonant switching module, a piezo-electric resonator and a light-emitting diode (LED) module.Rectifier is reception one alternating voltage, as civil power, is a direct voltage by its rectification; Quasi-resonant switching module, connect rectifier, quasi-resonant switching module comprises an inductance, an electric capacity and a switch, is connected between inductance and piezoelectric oscillator after switch and Capacitance parallel connection, is direct voltage to be made resonance to produce an inductive current; Piezo-electric resonator connects quasi-resonant switching module and receiving inductance electric current, and after being given resonator, filter, make it produce a string ripple electric current; And light-emitting diode (LED) module connects piezo-electric resonator receive string ripple electric current, be after direct current by it through rectification and drive luminescence.
Preferably in execution mode, during described switch conduction, described direct voltage starts described induction charging, inductive current described in it is increased, when described switch is for cut-off, described inductance, to described capacitor discharge, makes described electric capacity start charging, makes the voltage of described electric capacity be upgraded to high voltage level by low voltage level.
Preferably in execution mode, more comprise a rectification circuit, be connected between described piezo-electric resonator and described light-emitting diode (LED) module, described rectification circuit receives described string ripple electric current, and be a direct current by its rectification, make it drive described light-emitting diode (LED) module luminous.
Preferably in execution mode, more comprise at least one transformer, be connected between described piezo-electric resonator and described rectification circuit, in order to isolate the noise that described quasi-resonant switching module produces when the resonance or the driving voltage increasing described light-emitting diode (LED) module.
Preferably in execution mode, the resonance frequency of described inductance and described electric capacity is greater than the switching frequency of described switch and the resonator, filter frequency of described piezo-electric resonator, and the switching frequency of described switch is greater than the resonator, filter frequency of described piezo-electric resonator.
Preferably in execution mode, more comprising a filter inductance, be series between described electric capacity and described piezo-electric resonator, is the noise that the described quasi-resonant switching module of filtration produces when resonance.
Preferably in execution mode, described inductance and described filter inductance are around on same iron core, form one from coupling transformer, are promoted the inductive drop of described inductance.
The present invention utilizes Single switch to replace the half bridge designs of existing used biswitch, not only can reach zero voltage switching and effectively reduce switching loss when resonance, also can reach the effect reducing circuit cost.
Under illustrated in detail by specific embodiment, when the effect being easier to understand object of the present invention, technology contents, feature and reach.
Accompanying drawing explanation
Fig. 1 is first embodiment of the present invention schematic diagram.
Fig. 2 is the equivalent circuit diagram of quasi-resonant switching module of the present invention when switch ends.
Oscillogram when Fig. 3 is quasi-resonant switching module of the present invention running.
Fig. 4 is second embodiment of the present invention schematic diagram.
Fig. 5 is third embodiment of the present invention schematic diagram.
Fig. 6 is fourth embodiment of the present invention schematic diagram.
Fig. 7 is fifth embodiment of the present invention schematic diagram.
Fig. 8 is sixth embodiment of the present invention schematic diagram.
Another oscillogram when Fig. 9 is quasi-resonant switching module of the present invention running.
Description of reference numerals: 10-rectifier; 12-quasi-resonant switching module; 122-inductance; 124-electric capacity; 126-switch; 128-parasitic diode; 14-piezo-electric resonator; 16-light-emitting diode (LED) module; 18-rectification circuit; 20-filter inductance; 22-is unshakable in one's determination; 24-transformer; 26-intermittent oscillation circuit; 28-first inductance; 30-second inductance; 32-resistance; 34-BJT switch; 36-is unshakable in one's determination; 38-electric capacity.
Embodiment
Referring to Fig. 1, is first embodiment of the present invention schematic diagram.Piezo-electric resonance type LED driving circuit comprises rectifier 10, quasi-resonant switching module 12, piezo-electric resonator 14, light-emitting diode (LED) module 16 and a rectification circuit 18.Quasi-resonant switching module 12 is connected between rectifier 10 and piezo-electric resonator 14, and rectification circuit 18 is connected to piezo-electric resonator 14 to be connected between light-emitting diode (LED) module 16.Wherein, quasi-resonant switching module 12 comprises inductance 122, electric capacity 124 and a switch 126, is connected between inductance 122 and piezo-electric resonator 14 after the drain electrode (drain) of switch 126 and electric capacity 124 parallel connection; Inductance 122 is connected between rectifier 10 and switch 126; Piezo-electric resonator 14 is connected between electric capacity 124 and rectification circuit 18.
Rectifier 10 is alternating voltage (V that reception civil power inputs
aC), and be the direct voltage (V of positive half cycle by its rectification
dC), wherein rectifier 10 can be the bridge rectifiers such as Schottky barrier diode (SBD), Quick-return diode (FRD), Zener diode (ZD).Be the equivalent circuit diagram of quasi-resonant switching module 12 of the present invention when switch ends please refer to Fig. 2 and Fig. 3, Fig. 2, Fig. 3 is the oscillogram of quasi-resonant switching module 12 of the present invention when operating.Quasi-resonant switching module 12 receives direct voltage, if when switch 126 is conducting state, as shown in oscillogram, time interval is t0-t1, and now direct voltage starts to charge to inductance 122, and the electric current on inductance 122 is increased, and its cross-pressure is V
dC.When switch 126 is cut-off state, as shown in oscillogram, time interval is t1-t2, and now inductance 122 and electric capacity 126 start resonance, produce an inductive current (i accordingly
lin) and a capacitance voltage (V
c); In detail, during resonance, inductance 122 starts to discharge to electric capacity 124, and make electric capacity 124 start charging, on it, capacitance voltage rises to high voltage level by low voltage level, and capacitance voltage is now maximum (is such as the V of twice
dC).By piezo-electric resonator 14 resonator, filter characteristic, can make after filtering, to form string ripple electric current (being piezoelectric current) by the inductive current of piezo-electric resonator 14, and be sent to rectification circuit 18, string ripple current commutates is a direct current by it, and light-emitting diode (LED) module 16 can be driven luminous.When capacitance voltage returns back to low voltage level (V from high voltage level
c=0) time, the i.e. conducting of parasitic diode 128 on switch 126, and forced harmonic motion stops.For example, when switch 126 still maintains cut-off state, after resonance terminates, as shown in oscillogram, time interval is t2-t0, now the diode current on parasitic diode 128 and the piezoelectric current (i on piezo-electric resonator 14
piezo) equal.Because the cross-pressure on electric capacity 124 is 0, the cross-pressure on inductance is made to be V
dC, namely inductance 122 starts charging.At the end of t2-t0 interval, switch 126 switches to conducting state again, namely repeats interval t0-t1; Cross-pressure now on electric capacity 124 is 0, thus, can reach effect of zero voltage switching, and then reduces switch 126 loss.It should be noted that and quasi-resonant switching module 12 can be utilized direct voltage (V
dC) frequency upgrading to close to or be greater than the frequency of operation of piezo-electric resonator 14, just can guarantee the effect reaching zero voltage switching, the relational expression of following each frequency of operation:
Wherein, L
infor the inductance value of inductance 122, C is the capacitance of electric capacity 124, f
sWfor the switching frequency of switch 126, f
piezofor the resonator, filter frequency of piezo-electric resonator 14.
The resonance frequency of inductance 122 and electric capacity 124 is greater than the switching frequency of switch 126 and the resonator, filter frequency (being frequency of operation) of piezo-electric resonator 14, and the switching frequency of switch 126 is greater than again the resonator, filter frequency of piezo-electric resonator 14.
Again as shown in Figure 4, be second embodiment of the present invention schematic diagram, it is with the first embodiment difference: can connect a filter inductance 20 between electric capacity 124 and piezo-electric resonator 14.The noise that filter inductance 20 produces when the resonance in order to filter quasi-resonant switching module 12, the filtering of piezo-electric resonator 14 can be strengthened simultaneously, such as intercept the noise that the parasitic capacitance on piezo-electric resonator 14 produces, and then allow the string wave property of piezoelectric current reach optimization.
As shown in Figure 5, for third embodiment of the present invention schematic diagram, itself and the second embodiment difference are: be set around on same unshakable in one's determination 22 by inductance 122 and filter inductance 20, form one from coupling transformer, in order to promote the ability of transmission voltage, that is, the inductive drop on inductance 122 and filter inductance 20 can be promoted.
As shown in Figure 6, for fourth embodiment of the present invention schematic diagram, itself and the first embodiment difference are: light-emitting diode (LED) module 16 itself has rectification characteristic, the string ripple current commutates that piezo-electric resonator 14 can be provided is the direct current that can drive interior light emitting diodes element 162, so can reduce the cost of rectification circuit, and then allow Integral luminous diode drive circuit design more simplify and volume lightening, have market competition advantage.
As shown in Figure 7, for fifth embodiment of the present invention schematic diagram, itself and the first embodiment difference are: set up a transformer 24, it is connected between piezo-electric resonator 14 and rectification circuit 18, the noise that quasi-resonant switching module 12 produces when resonance isolated by transformer 24, or transformer 24 can increase the driving voltage of light-emitting diode (LED) module 16.
As shown in Figure 8, for sixth embodiment of the present invention schematic diagram, itself and the first embodiment difference are: set up interval oscillating circuit (blockingoscillator), reach self-resonance effect, and interval oscillating circuit is identical with the start principle of quasi-resonant switching module 12, because both internal circuit design are slightly different, therefore the energy transferring mode of circuit is slightly different, is detailed later.Interval oscillating circuit 26 comprises the first inductance 28, second inductance 30, resistance 32 and BJT switch 34.First inductance 28 and the second inductance 30 are oppositely with being around on an iron core 36, resistance 32 is connected between the first inductance 28 and BJT switch 34 base stage (base), is connected between the second inductance 30 and piezo-electric resonator 14 after the emitter-base bandgap grading (collector) of BJT switch 34 is in parallel with electric capacity 38.When interval oscillating circuit 26 starts, an electric current (i
2) via the first inductance 28 and resistance 32 conducting BJT switch 34.When after BJT switch 34 conducting, the second inductance 30 starts charging; Meanwhile, because of the first inductance 28 and the second inductance 30 reverse coupled therefore, the base current (i of the second inductance 30
b) start to reduce, as shown in Figure 9, time interval shown in figure is t2-t0.As base current (i
b) relative to emitter current (i
c) too small time, BJT switch 34 ends.Its cut-off relational expression is:
i
b＜i
c/β
Wherein i
bfor base current, i
cfor emitter current, and β is the multiplication factor of BJT switch 34.After switch 34 ends, the second inductance 30 and electric capacity 38 resonance, time interval is t1-t2 as shown in FIG..After second inductance 30 terminates with electric capacity 38 resonance, input electric current (i
2) again via the first inductance 28 and resistance 32 conducting BJT switch 34.It should be noted that t0 and t2 shown in figure is same point, so in this embodiment, BJT switch 34 does not need the trigger signals of external active, and only needs a coil and a resistance 32, significantly can reduce circuit cost.
Can be learnt by the oscillogram of Fig. 9, when blocking oscillator is between t0 (time shaft about 1.065 place) to t1 (time shaft about 1.095 place), BJT switch 34 conducting, now the second inductance 30 charges.When t1 (1.095 place) to t0 (referring to 1.105 here) is interval, BJT switch 34 disconnects, and now the second inductance 30 discharges, the second inductance 30 resonance together with piezo-electric resonator 14, now piezoelectric voltage V
cwaveform is interval with the 3rd figure t1 to t2.It should be noted that in the embodiment of blocking oscillator, BJT switch 34 after inductance 30 and the resonance of piezo-electric resonator 14 terminate, BJT switch 34 conducting immediately.Therefore, in this embodiment, t0 and t2 in Fig. 3 overlaps.Because the second inductance 30 of intermittent oscillation circuit 26 can provide the i that the first embodiment is identical
lin-(ask the i of comparison diagram 3 and Fig. 9
linwaveform), piezo-electric resonator 14 resonance transferring energy can be made, thus drive light-emitting diode (LED) module 16.
In sum, the present invention utilizes Single switch to replace the half bridge designs of existing used biswitch, not only can reach zero voltage switching and effectively reduce switching loss when resonance, also can reach the effect reducing circuit cost.
As described above, be only preferred embodiment of the present invention, is not used for limiting scope of the invention process.Therefore namely all equalizations of doing according to the feature described in the present patent application scope and spirit change or modify, and all should be included in claim of the present invention.
Claims (6)
1. a piezo-electric resonance type LED driving circuit, is characterized in that, comprising:
One rectifier is reception one alternating voltage, is a direct voltage by its rectification;
One quasi-resonant switching module, connect described rectifier, described quasi-resonant switching module comprises an inductance, an electric capacity and a switch, is connected between described inductance and described electric capacity after described switch and described Capacitance parallel connection, is described direct voltage to be made resonance to produce an inductive current;
One piezo-electric resonator, is connect described quasi-resonant switching module and receive described inductive current, and after being given resonator, filter, makes it produce string ripple electric current surely; And
One light-emitting diode (LED) module connects described piezo-electric resonator receive described accurate string ripple electric current, is after direct current and drives luminescence by it through rectification,
Wherein, the resonance frequency of described inductance and described electric capacity is greater than the switching frequency of described switch and the resonator, filter frequency of described piezo-electric resonator, and the switching frequency of described switch is greater than the resonator, filter frequency of described piezo-electric resonator.
2. piezo-electric resonance type LED driving circuit as claimed in claim 1, it is characterized in that, during described switch conduction, described direct voltage starts described induction charging, inductive current described in it is increased, and when described switch is for cut-off, described inductance is to described capacitor discharge, make described electric capacity start charging, make the voltage of described electric capacity be upgraded to high voltage level by low voltage level.
3. piezo-electric resonance type LED driving circuit as claimed in claim 1, it is characterized in that, more comprise a rectification circuit, be connected between described piezo-electric resonator and described light-emitting diode (LED) module, described rectification circuit receives described string ripple electric current, and be a direct current by its rectification, make it drive described light-emitting diode (LED) module luminous.
4. piezo-electric resonance type LED driving circuit as claimed in claim 3, it is characterized in that, more comprise at least one transformer, be connected between described piezo-electric resonator and described rectification circuit, in order to isolate the noise that described quasi-resonant switching module produces when the resonance or the driving voltage increasing described light-emitting diode (LED) module.
5. piezo-electric resonance type LED driving circuit as claimed in claim 1, is characterized in that, more comprise a filter inductance, be series between described electric capacity and described piezo-electric resonator, is the noise that the described quasi-resonant switching module of filtration produces when resonance.
6. piezo-electric resonance type LED driving circuit as claimed in claim 5, it is characterized in that, described inductance and described filter inductance are around on same iron core, form one from coupling transformer, are promoted the inductive drop of described inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210001857.6A CN103200725B (en) | 2012-01-05 | 2012-01-05 | Piezo-electric resonance type LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210001857.6A CN103200725B (en) | 2012-01-05 | 2012-01-05 | Piezo-electric resonance type LED driving circuit |
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| CN103200725A CN103200725A (en) | 2013-07-10 |
| CN103200725B true CN103200725B (en) | 2016-03-30 |
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| CN105407583B (en) * | 2015-12-30 | 2017-03-22 | 哈尔滨工业大学 | Single-pole quasi-resonance LED driving device based on Buck-Boost circuit and Flyback circuit |
| US11387624B2 (en) * | 2020-02-04 | 2022-07-12 | Analog Devices International Unlimited Company | Resonant laser driver |
| WO2023050290A1 (en) * | 2021-09-30 | 2023-04-06 | 深圳市汇顶科技股份有限公司 | Sine wave pulse signal generating circuit and related electronic apparatus |
| CN113922792B (en) * | 2021-09-30 | 2022-10-18 | 深圳市汇顶科技股份有限公司 | Sine wave pulse signal generating circuit and related electronic device |
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| CN1592061A (en) * | 2003-09-01 | 2005-03-09 | 台达电子工业股份有限公司 | Push-pull converter and method for power supply device and uninterrupted power supply system |
| TWM365013U (en) * | 2009-01-06 | 2009-09-11 | qing-ming Lai | Portable high-voltage power supply device |
| TW201101668A (en) * | 2009-06-26 | 2011-01-01 | Midas Wei Trading Co Ltd | Piezoelectric power converter with high-power output |
| JP4844674B2 (en) * | 2007-08-17 | 2011-12-28 | 株式会社村田製作所 | Switching power supply |
| CN202602967U (en) * | 2012-01-05 | 2012-12-12 | 金威贸易有限公司 | Piezoelectric resonator type light emitting diode drive circuit |
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2012
- 2012-01-05 CN CN201210001857.6A patent/CN103200725B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592061A (en) * | 2003-09-01 | 2005-03-09 | 台达电子工业股份有限公司 | Push-pull converter and method for power supply device and uninterrupted power supply system |
| JP4844674B2 (en) * | 2007-08-17 | 2011-12-28 | 株式会社村田製作所 | Switching power supply |
| TWM365013U (en) * | 2009-01-06 | 2009-09-11 | qing-ming Lai | Portable high-voltage power supply device |
| TW201101668A (en) * | 2009-06-26 | 2011-01-01 | Midas Wei Trading Co Ltd | Piezoelectric power converter with high-power output |
| CN202602967U (en) * | 2012-01-05 | 2012-12-12 | 金威贸易有限公司 | Piezoelectric resonator type light emitting diode drive circuit |
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