CN104981067A - LED driver - Google Patents
LED driver Download PDFInfo
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- CN104981067A CN104981067A CN201510395788.5A CN201510395788A CN104981067A CN 104981067 A CN104981067 A CN 104981067A CN 201510395788 A CN201510395788 A CN 201510395788A CN 104981067 A CN104981067 A CN 104981067A
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Abstract
The invention provides an LED driver. Different filter sub-circuits are allocated for various types of output signals, so that the output signals are filtered respectively. In this way, the device selecting and the parameter presetting for each filter sub-circuit can be conducted in the more targeted manner. Compared with a conventional LED driver provided with a single filter circuit in the prior art, the above LED driver is better in filtering effect on the premise that the factors of cost, size and service life are given consideration to at the same time. Therefore, the current for LED loads is kept constant. Meanwhile, the flicking/damaged condition of LED loads caused by the intermittent operation of a high-frequency switching power supply or the influence of dynamic pulse signals can be avoided.
Description
Technical field
The present invention relates to LED driver technical field, particularly relate to a kind of LED driver.
Background technology
The filter circuit that in prior art, the output of LED driver uses is more single, such as the simple output parallel electrolytic electric capacity at LED driver.Generally speaking, if the control mode that LED driver adopts is that load power demand is less, the variable frequency control mode that switching frequency is higher, see Fig. 1, the output signal of LED driver is except switch frequency signal S1, also may superpose discontinuous operation frequency signal S2 and dynamic pulse signal S3, concrete reason is: when LED load power demand is less, LED driver is by the restriction of the highest frequency upper limit, low frequency discontinuous operation pattern can be in, now, the output signal of LED driver also comprises discontinuous operation frequency signal; When LED driver input power has dynamic disturbances, this disturbance also can be passed to its output, and now, the output signal of LED driver also comprises dynamic pulse signal.In order to not affect the normal work of LED load, just require that the output filter circuit of LED driver can play filter action to above three kinds of signals.
Due to frequency or the type difference of above three kinds of signals, only use single filter may not be optimum in design; Such as, when only using electrochemical capacitor filtering, because the reliability of electrochemical capacitor and life-span are by the restriction of switching harmonics electric current, if meet the derate requirement of electrochemical capacitor to switch ripple current, then the capacitance of electric capacity can be larger, will make that the filter circuit volume of LED driver is large, cost is high; If only use high frequency capacitance, although its switching harmonics current carrying capability is comparatively large, by the restriction of its manufacture craft, its capacity is less, so meet the Large Copacity needs of driver low frequency discontinuous operation pattern with high frequency capacitance, cost can be very high.
How controlling cost, coming up in volume and the basis in life-span, to affect the described output signal that LED load normally works be a problem urgently to be resolved hurrily in filtering.
Summary of the invention
In view of this, the invention provides a kind of LED driver, to solve in prior art large with volume and cost is high for cost is to ensure the problem of filter effect.
A kind of LED driver, comprising: output connects the high frequency switch power of LED load, the first filter branch between two outputs being connected to described high frequency switch power and the second filter branch;
Wherein, the output signal of described high frequency switch power comprises at least one and the switch frequency signal of discontinuous operation frequency signal and dynamic pulse signal, and the frequency of described switch frequency signal is greater than the frequency of described discontinuous operation frequency signal;
Described first filter branch and described second filter branch are connected in parallel, and described second filter branch comprises the impedance adjustment unit and filter unit that are connected in series;
By arranging the parameter of energy-storage travelling wave tube in the impedance of described impedance adjustment unit, described first filter branch and described filter unit, the component making described switch frequency signal flow through described first filter branch is greater than the component flowing through described second filter branch, and the component making described discontinuous operation frequency signal and described dynamic pulse signal flow through described first filter branch is all less than the component flowing through described second filter branch.
Preferably, described impedance adjustment unit is inductance or resistance.
Preferably, described first filter branch comprises high frequency capacitance, and described filter unit comprises electrochemical capacitor, and the capacitance of described electrochemical capacitor is greater than the capacitance of described high frequency capacitance.
Preferably, described high frequency capacitance is high-frequency film electric capacity.
Preferably, described high frequency capacitance is patch capacitor.
Preferably, described second filter branch also comprises the diode in parallel with described impedance adjustment unit, sense of current when sense of current during described diode current flow is the electric discharge of described filter unit.
Preferably, described high frequency switch power comprises the AC/DC module and DC/DC module of connecting successively.
LED driver provided by the invention passes through for dissimilar output signal, distribute different filter branch and respectively filtering is carried out to all kinds of output signal, make each filter branch can carry out device selection and optimum configurations targetedly, compared with adopting single filter circuit in prior art, reach better filter effect taking into account on cost, volume and the basis in life-span, be conducive to the current constant of LED load, flicker or the damage of LED load can not be caused because of the discontinuous operation of high frequency switch power or dynamic pulse signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The signal output waveform figure of Fig. 1 high frequency switch power disclosed in the embodiment of the present invention;
Fig. 2 is LED driver structural representation disclosed in the embodiment of the present invention;
Fig. 3 is the embodiment of the present invention another LED driver structural representation disclosed;
Fig. 4 is the embodiment of the present invention another LED driver structural representation disclosed;
Fig. 5 is the embodiment of the present invention another LED driver structural representation disclosed;
Fig. 6 is the embodiment of the present invention another LED driver structural representation disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of LED driver, to solve in prior art large with volume and cost is high for cost is to reach the problem of better filter effect.
A kind of LED driver, as shown in Figure 2, comprising: output connects the high frequency switch power 101 of LED load, the first filter branch 102 and the second filter branch 103 between two outputs being connected to high frequency switch power 101;
Wherein, the output signal of high frequency switch power 101 comprises at least one and the switch frequency signal of discontinuous operation frequency signal and dynamic pulse signal, and the frequency of described switch frequency signal is greater than the frequency of described discontinuous operation frequency signal;
First filter branch 102 and the second filter branch 103 are connected in parallel, and the second filter branch 103 comprises the impedance adjustment unit 301 and filter unit 302 that are connected in series;
By arranging the parameter of energy-storage travelling wave tube in the impedance of impedance adjustment unit 301, the first filter branch 102 and filter unit 302, the component making described switch frequency signal flow through the first filter branch 102 is greater than the component flowing through the second filter branch 103, and the component making described discontinuous operation frequency signal and described dynamic pulse signal flow through the first filter branch 102 is all less than the component flowing through the second filter branch 103.
It should be noted that, here only limit the optimum configurations mode of energy-storage travelling wave tube in the impedance set-up mode of impedance adjustment unit 301, the first filter branch 102 and filter unit 302, and do not limit the particular circuit configurations of impedance adjustment unit 301, first filter branch 102 and filter unit 302.In other words, the only parallel filtering circuit structure of employing the present invention first filter branch 102 and the second filter branch 103, have ignored described impedance set-up mode and described optimum configurations mode will be difficult to solve the problem proposed in background technology.
Specific works principle is as follows:
The resistance value of (1) second filter branch 103 is the resistance value of impedance adjustment unit 301 and the resistance value sum of filter unit 302, make the resistance value of the second filter branch 103 be greater than the resistance value of the first filter branch 102 by the resistance value arranging impedance adjustment unit 301, thus the various types of signal (comprising described switch frequency signal, described discontinuous operation frequency signal and described dynamic pulse signal) during described LED driver is outputed signal is preferentially by the first filter branch 102 in described two parallel branches.In other words, the impedance adjustment unit 301 in the second filter branch 103 does not mainly strobe, but plays the effect of preferred filter paths to described various types of signal.
(2) well-known, common filter circuit is used for realizing filter action by the energy storage of the energy-storage travelling wave tube in it, such as square-wave signal is via the filter action of filter circuit, in the one-period of square-wave signal, when the energy that between its high period, filter circuit stores equals the energy of filter circuit release between its low period, then described square-wave signal can filter into direct current signal by filtered circuit.Therefore, by arranging the parameter of energy-storage travelling wave tube in the first filter branch 102 and described filter circuit (the second filter branch 103), the energy storage capacity of the first filter branch 102 can be made to be less than the energy storage capacity of described filter circuit (the second filter branch 103), namely to make the filter capacity of the first filter branch 102 be less than the filter capacity of described filter circuit (the second filter branch 103).
Arrange in conjunction with the setting of filter branch preferred in above-mentioned (1) and the difference of two filter branch energy storage capacity in (2), when the energy of a signal is less than the energy storage capacity of the first filter branch 102, the component that this signal flows through the first filter branch 102 is greater than the component flowing through the second filter branch 103; When the energy of a signal is much larger than the energy storage capacity of the first filter branch 102, owing to being limited to the filter capacity of the first filter branch 102, this signal can only be selected to flow through the second filter branch 103, and the component that namely this signal flows through the second filter branch 103 is greater than the component of the first filter branch 102.
Why a certain signal can not be all because two filter branch are parallel connectivity by a wherein filter branch, voltage based on parallel connectivity is equal, when preferentially by a road filter branch, residue road filter branch is also by this signal of fraction.
It should be noted that, see Fig. 1, switch frequency signal S1, discontinuous operation frequency signal S2 during high frequency switch power 101 outputs signal, dynamic pulse signal S3 three compare from energy point of view, one because the frequency higher cycle less be low-yield signal, because frequency lower cycle more greatly high energy signals both, the third party is because amplitude more greatly high energy signals.
Therefore arranged by the impedance of impedance adjustment unit 301, make the resistance value of the second filter branch 103 be greater than the resistance value of the first filter branch 102; By the optimum configurations of energy-storage travelling wave tube in the first filter branch 102 and filter unit 302, the filter capacity of the first filter branch 102 is made to be less than the filter capacity of the second filter branch 103, and then realizing the component that component that switch frequency signal S1 (low-yield signal) flows through the first filter branch 102 is greater than the second filter branch 103, the component that discontinuous operation frequency signal S2 and dynamic pulse signal S3 (high energy signals) flows through the second filter branch 103 is all greater than the component flowing through the first filter branch 102.
In sum, technical scheme provided by the invention is passed through for dissimilar output signal, distribute different filter branch and respectively filtering is carried out to all kinds of output signal, make each filter branch can carry out device selection and optimum configurations targetedly, compared with adopting single filter circuit in prior art, reach better filter effect taking into account on cost, volume and the basis in life-span, be conducive to the current constant of LED load, flicker or the damage of LED load can not be caused because of the discontinuous operation of high frequency switch power 101 or dynamic pulse signal.
Preferably, as shown in Figure 3, impedance adjustment unit 301 is resistance R, the resistance that can arrange resistance R is greater than the equiva lent impedance of the first filter branch 102, the equiva lent impedance of second filter branch 103 at resistance R place is made to be greater than the equiva lent impedance of the first filter branch 102, thus play the filter circuit that signal to be filtered is formed in parallel through the first filter branch 102 and the second filter branch 103, preferably by the first filter branch 102.
Or as shown in Figure 4, impedance adjustment unit 301 is inductance L.Here inductance L mainly utilizes it to hinder the effect of electric current, namely increases the effect of the second filter branch 103 impedance, but not its energy storage effect.
Concrete, described LED driver, as shown in Figure 5, the first filter branch 102 is high frequency capacitance C1, and filter unit 302 is electrochemical capacitor C2;
The capacitance of electrochemical capacitor C2 is greater than the capacitance of high frequency capacitance C1.
Concrete operation principle is:
The capacity of the capacity of electrochemical capacitor C2 is generally greater than (even much larger than) high frequency capacitance C1, difference is between the two not specifically limited herein, is determined by its embody rule environment.
The capacity of electrochemical capacitor C2 is greater than the capacity of high frequency capacitance C1, because the intrinsic series equivalent resistance resistance of electrochemical capacitor C2 is usually smaller, makes the impedance of electric capacity electrochemical capacitor C2 much smaller than high frequency capacitance C1 like this.If high frequency capacitance C1 and electrochemical capacitor C2 is directly in parallel, the larger high frequency ripple current (switch frequency signal) that high frequency switch power exports will mainly flow through electrochemical capacitor C2, then cannot reduce the high frequency ripple current flowing through electrochemical capacitor C2.
The described LED that the present embodiment provides drives filter circuit, when the frequency of the switch frequency signal of high frequency switch power is f, the equiva lent impedance of high frequency capacitance C1 is 1/ (2 π fC1), the impedance of impedance adjustment unit 301 is designated as Z, then Z+ [1/ (2 π fC2)] >1/ (2 π fC1), namely the equiva lent impedance of the series arm of impedance adjustment unit 301 and electrochemical capacitor C2 will be greater than the equiva lent impedance of high frequency capacitance C1.The larger switching frequency ripple current (switch frequency signal) of now high frequency switch power 101 output, to mainly flow through high frequency capacitance C1 (equivalent resistance of its series connection is less), and the switching frequency ripple current of the series arm of impedance adjustment unit 301 and electrochemical capacitor C2 is less, because the ESR equivalent resistance of electrochemical capacitor C2 is larger, when the switching harmonics electric current flowing through electrochemical capacitor C2 is less, the loss of its equivalent resistance can be effectively reduced, suppress the temperature rise that the loss of equivalent resistance brings, thus extend the life-span of electrochemical capacitor C2.According to filtering mode of the prior art, all switching frequency ripple currents that high frequency switch power exports are all through electrochemical capacitor filtering, loss on the equivalent resistance of electrochemical capacitor is comparatively large, and temperature rise is also comparatively large, easily causes the explosion of electrochemical capacitor or shortens the life-span of electrochemical capacitor.
What deserves to be explained is, based on the variable frequency control mode of background technology medium-high frequency Switching Power Supply, high frequency switch power can enter discontinuous operation pattern in underloading situation, namely work a period of time, stop a period of time, by the restriction of described high frequency capacitance C1 energy storage capacity, if there is no the second filter branch 103, the LED load electric current be attached thereto will be made to cut in and out, easily produce low frequency stroboscopic situation.Now, the discontinuous operation frequency signal S2 that high frequency switch power 101 exports needs to rely on electrochemical capacitor C2 to carry out filtering, specifically when high frequency switch power 101 works, electrochemical capacitor C2 stored energy, when high frequency switch power 101 quits work, electrochemical capacitor C2 releases energy to LED load, thus makes LED load no matter can continue when whether high frequency switch power 101 works to obtain constant current, naturally there will not be low frequency stroboscopic.
In addition, dynamic pulse signal S3 in background technology is passed to its output by high frequency switch power 101, by the restriction of high frequency capacitance C1 energy storage capacity, also the electrochemical capacitor C2 in the second filter branch 103 will be relied on to absorb, to prevent this macro-energy signal directly through LED load, LED load is caused to be damaged.
Preferably, as shown in Figure 6, described LED driver also comprises the diode D in parallel with impedance adjustment unit 301 (in this figure, example is resistance R), and sense of current during diode D conducting is the sense of current of filter unit 302 (in this figure, example is electrochemical capacitor C2) when discharging.
Under normal circumstances, the charge and discharge process of electrochemical capacitor C2 is all through resistance R; But when there is short trouble in the LED load be connected with described LED driver output, the output current of described LED driver can instantaneous quick rising, the diode D of the sense of current when sense of current when resistance R two ends turned in parallel is electrochemical capacitor C2 electric discharge, big current during fault is made to flow through diode D, form big current path, so avoid resistance R due to transient power excessive and burn out.
As shown in Figure 6, described high frequency switch power comprises the AC/DC module and DC/DC module of connecting successively, and AC/DC module is converted to DC power supply alternating current input power supplying, and the DC power supply of input is converted to the voltage and current needed for LED load by DC/DC module.
Preferably, high frequency capacitance C1 is high-frequency film electric capacity.
Or high frequency capacitance C1 is patch capacitor.
In concrete practical application, high frequency capacitance C1 can be non-electrolytic capacitor: high-frequency film electric capacity or patch capacitor, as ceramic disc capacitor, be not specifically limited herein, depending on its embody rule environment.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a LED driver, is characterized in that, comprising: output connects the high frequency switch power of LED load, the first filter branch between two outputs being connected to described high frequency switch power and the second filter branch;
Wherein, the output signal of described high frequency switch power comprises at least one and the switch frequency signal of discontinuous operation frequency signal and dynamic pulse signal, and the frequency of described switch frequency signal is greater than the frequency of described discontinuous operation frequency signal;
Described first filter branch and described second filter branch are connected in parallel, and described second filter branch comprises the impedance adjustment unit and filter unit that are connected in series;
By arranging the parameter of energy-storage travelling wave tube in the impedance of described impedance adjustment unit, described first filter branch and described filter unit, the component making described switch frequency signal flow through described first filter branch is greater than the component flowing through described second filter branch, and the component making described discontinuous operation frequency signal and described dynamic pulse signal flow through described first filter branch is all less than the component flowing through described second filter branch.
2. LED driver according to claim 1, is characterized in that, described impedance adjustment unit is inductance or resistance.
3. LED driver according to claim 1, is characterized in that, described first filter branch comprises high frequency capacitance, and described filter unit comprises electrochemical capacitor, and the capacitance of described electrochemical capacitor is greater than the capacitance of described high frequency capacitance.
4. LED driver according to claim 3, is characterized in that, described high frequency capacitance is high-frequency film electric capacity.
5. LED driver according to claim 3, is characterized in that, described high frequency capacitance is patch capacitor.
6. LED driver as claimed in any of claims 1 to 5, it is characterized in that, described second filter branch also comprises the diode in parallel with described impedance adjustment unit, sense of current when sense of current during described diode current flow is the electric discharge of described filter unit.
7. LED driver according to claim 1, is characterized in that, described high frequency switch power comprises the AC/DC module and DC/DC module of connecting successively.
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| CN201510395788.5A CN104981067B (en) | 2015-07-03 | 2015-07-03 | A kind of LED driver |
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| CN201510395788.5A CN104981067B (en) | 2015-07-03 | 2015-07-03 | A kind of LED driver |
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| CN104981067B CN104981067B (en) | 2017-09-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106253707A (en) * | 2016-08-22 | 2016-12-21 | 广东美的制冷设备有限公司 | Power control circuit and air-conditioner |
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| CN101447780A (en) * | 2007-11-28 | 2009-06-03 | 索尼株式会社 | Switched capacitor circuit, switched capacitor filter, and sigma-delta A/D converter |
| US20120056577A1 (en) * | 2009-03-10 | 2012-03-08 | Marcos Schwarz | Control System for Single-Phase Induction Motor and Control Method for Single-Phase Induction Motor |
| US20130187543A1 (en) * | 2012-01-20 | 2013-07-25 | Macroblock, Inc. | Dynamic damper and lighting driving circuit comprising the dynamic damper |
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Application publication date: 20151014 Assignee: ZHEJIANG INVENT OPTOELECTRONIC CO.,LTD. Assignor: INVENTRONICS (HANGZHOU), Inc. Contract record no.: X2021330000385 Denomination of invention: LED driver Granted publication date: 20170926 License type: Common License Record date: 20211026 |
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