CN204721692U - A kind of LED driver - Google Patents
A kind of LED driver Download PDFInfo
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- CN204721692U CN204721692U CN201520489069.5U CN201520489069U CN204721692U CN 204721692 U CN204721692 U CN 204721692U CN 201520489069 U CN201520489069 U CN 201520489069U CN 204721692 U CN204721692 U CN 204721692U
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Abstract
LED driver disclosed in the utility model, by distributing different filter branch (filter branch at high frequency capacitance C1 place and the filter branch at electrochemical capacitor C2 place), respectively filtering is carried out to all kinds of output signals of high frequency switch power, make each filter branch can carry out device selection and optimum configurations targetedly, compared with adopting single filter circuit in prior art, taking into account cost, the basis in volume and life-span reaches better filter effect, 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.
Description
Technical field
The utility model relates to LED Driving technique field, particularly relates 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 S2; 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 S3.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 the switching harmonics current carrying capability of its high frequency capacitance 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.
Utility model content
In view of this, the utility model 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: high frequency switch power, the high frequency capacitance between two outputs being connected to described high frequency switch power, and the electrochemical capacitor be connected in series and impedance unit; Wherein:
The series arm of described electrochemical capacitor and described impedance unit is in parallel with described high frequency capacitance, and tie point is respectively as two outputs of described LED driver;
Two inputs of described high frequency switch power are respectively as two inputs of described LED driver;
The impedance of described impedance unit is greater than the equiva lent impedance of described high frequency capacitance;
The capacity of described electrochemical capacitor is greater than the capacity of described high frequency capacitance.
Preferably, described impedance unit is resistance or inductance.
Preferably, also comprise the diode in parallel with described impedance unit, sense of current when sense of current during described diode current flow is the electric discharge of described electrochemical capacitor.
Preferably, described high frequency capacitance is high-frequency film electric capacity.
Preferably, described high frequency capacitance is patch capacitor.
Preferably, described high frequency switch power comprises the AC/DC module and DC/DC module of connecting successively.
LED driver disclosed in the utility model, impedance due to described impedance unit is greater than the equiva lent impedance of described high frequency capacitance, the capacity of described electrochemical capacitor is greater than the capacity of described high frequency capacitance, so the low-yield signal (switch frequency signal S1) of the less filter capacity of needs of high frequency switch power output, mainly flow through described high frequency capacitance, and the high energy signals (discontinuous operation frequency signal S2 and dynamic pulse signal S3) of the larger filter capacity of needs that described high frequency switch power exports, mainly flow through the series arm of described impedance unit and described electrochemical capacitor, the filter branch (filter branch at high frequency capacitance C1 place and the filter branch at electrochemical capacitor C2 place) different by above-mentioned distribution carries out filtering respectively to all kinds of output signals of described high frequency switch power, make each filter branch can carry out device selection and optimum configurations targetedly, compared with adopting single filter circuit in prior art, taking into account cost, the basis in volume and life-span reaches better filter effect, 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 utility model embodiment 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 embodiments more of the present utility model, 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 utility model embodiment;
Fig. 2 is LED driver structural representation disclosed in the utility model embodiment;
Fig. 3 is the utility model embodiment another LED driver structural representation disclosed;
Fig. 4 is the utility model embodiment another LED driver structural representation disclosed;
Fig. 5 is the utility model embodiment another LED driver structural representation disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model 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.
Concrete, described LED driver, as shown in Figure 1, comprising: high frequency switch power 101, the high frequency capacitance C1 between two outputs being connected to high frequency switch power 101, and the electrochemical capacitor C2 be connected in series and impedance unit 301; Wherein:
The series arm of electrochemical capacitor C2 and impedance unit 301 is in parallel with high frequency capacitance C1, and tie point is respectively as two outputs of described LED driver;
Two inputs of high frequency switch power 101 are respectively as two inputs of described LED driver;
The impedance of impedance unit 301 is greater than the equiva lent impedance of high frequency capacitance C1;
The capacity of electrochemical capacitor C2 is greater than the capacity 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 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 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 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.
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 the series arm not having impedance unit 301 and electrochemical capacitor C2 to form, will make the LED load electric current be attached thereto 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 will rely on electrochemical capacitor C2 to absorb, to prevent this macro-energy signal directly through LED load, LED load is caused to be damaged.
The impedance of impedance unit 301 is greater than the equiva lent impedance of high frequency capacitance C1, and the various types of signal (comprising described switch frequency signal S1, described discontinuous operation frequency signal S2 and described dynamic pulse signal S3) during described LED driver can be made to output signal is preferentially by high frequency capacitance C1.In other words, impedance unit 301 does not mainly strobe, but plays the effect of preferred filter paths to described various types of signal.
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, be greater than the capacity of high frequency capacitance C1 by the capacity arranging electrochemical capacitor C2, the energy storage capacity of high frequency capacitance C1 can be made to be less than the energy storage capacity of electrochemical capacitor C2, namely make the filter capacity of high frequency capacitance C1 be less than the filter capacity of electrochemical capacitor C2.
When the energy of a signal is less than the energy storage capacity of high frequency capacitance C1, the component that this signal flows through high frequency capacitance C1 is greater than the component flowing through electrochemical capacitor C2; When the energy of a signal is much larger than the energy storage capacity of high frequency capacitance C1, owing to being limited to the filter capacity of high frequency capacitance C1, this signal can only be selected to flow through electrochemical capacitor C2, and the component that namely this signal flows through electrochemical capacitor C2 is greater than the component of high frequency capacitance C1.
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 unit 301, make the resistance value of impedance unit 301 and electrochemical capacitor C2 be greater than the resistance value of high frequency capacitance C1; By the optimum configurations of energy-storage travelling wave tube in high frequency capacitance C1 and electrochemical capacitor C2, the filter capacity of high frequency capacitance C1 is made to be less than the filter capacity of electrochemical capacitor C2, and then realizing the component that component that switch frequency signal S1 (low-yield signal) flows through high frequency capacitance C1 is greater than electrochemical capacitor C2, the component that discontinuous operation frequency signal S2 and dynamic pulse signal S3 (high energy signals) flows through electrochemical capacitor C2 is all greater than the component flowing through high frequency capacitance C1.
The present embodiment carries out filtering by the filter branch (filter branch at high frequency capacitance C1 place and the filter branch at electrochemical capacitor C2 place) that above-mentioned distribution is different respectively to all kinds of output signals of described high frequency switch power, make each filter branch can carry out device selection and optimum configurations targetedly, compared with adopting single filter circuit in prior art, taking into account cost, the basis in volume and life-span reaches better filter effect, 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.
Preferably, impedance unit 301 is resistance R (as shown in Figure 3) or inductance L (as shown in Figure 4).
In concrete practical application, the discharge and recharge time constant of resistance R and electrochemical capacitor C2 can be set to be greater than 0.01S.
What deserves to be explained is, the mode adopting the π type filter structure of high frequency capacitance and inductance formation in parallel with the output of high frequency switch power is also there is in prior art, the high frequency ripple current that described π type filter structure can export with high frequency switch power described in less capacitance filtering, but enter in underloading situation low frequency have the hiccups pattern time, by the restriction of described high frequency capacitance energy storage capacity, the low-frequency ripple electric current of frequency of having the hiccups can be very large, and the LED load be attached thereto will be made to produce low frequency stroboscopic situation.
And the described LED driver that the present embodiment provides, the charge and discharge process of electrochemical capacitor C2 is all through resistance R, because the capacity of electrochemical capacitor C2 is larger, and the discharge and recharge time constant of resistance R and electrochemical capacitor C2 is greater than 0.01S, it can be made to be greater than described LED driver having the hiccups the cycle when underloading, energy storage capacity enough when making the series arm of resistance R and electrochemical capacitor C2 can provide underloading, to reduce the fluctuating range of low-frequency ripple electric current, avoids the low frequency stroboscopic situation of LED load.
In concrete practical application, the value order of magnitude of resistance R resistance is ohm, the value order of magnitude of electrochemical capacitor C2 capacity is hundred microfarads, and both values make the discharge and recharge time constant of resistance R and electrochemical capacitor C2 be greater than 0.01S, are not specifically limited herein.
Preferably, as shown in Figure 5, described LED driver also comprises the diode D in parallel with resistance R, sense of current when sense of current during diode D conducting is electrochemical capacitor C2 electric discharge.
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 even 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.
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.
Preferably, 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.
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 utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model 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 (6)
1. a LED driver, is characterized in that, comprising: high frequency switch power, the high frequency capacitance between two outputs being connected to described high frequency switch power, and the electrochemical capacitor be connected in series and impedance unit; Wherein:
The series arm of described electrochemical capacitor and described impedance unit is in parallel with described high frequency capacitance, and tie point is respectively as two outputs of described LED driver;
Two inputs of described high frequency switch power are respectively as two inputs of described LED driver;
The impedance of described impedance unit is greater than the equiva lent impedance of described high frequency capacitance;
The capacity of described electrochemical capacitor is greater than the capacity of described high frequency capacitance.
2. LED driver according to claim 1, is characterized in that, described impedance unit is resistance or inductance.
3. LED driver according to claim 1, is characterized in that, also comprises the diode in parallel with described impedance unit, sense of current when sense of current during described diode current flow is the electric discharge of described electrochemical capacitor.
4. LED driver according to claim 1, is characterized in that, described high frequency capacitance is high-frequency film electric capacity.
5. LED driver according to claim 1, is characterized in that, described high frequency capacitance is patch capacitor.
6. LED driver as claimed in any of claims 1 to 5, 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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| CN201520489069.5U CN204721692U (en) | 2015-07-03 | 2015-07-03 | A kind of LED driver |
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| CN201520489069.5U CN204721692U (en) | 2015-07-03 | 2015-07-03 | A kind of LED driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896540A (en) * | 2016-04-13 | 2016-08-24 | 苏州立旭智能电气有限公司 | Voltage-dividing type harmonic suppression device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896540A (en) * | 2016-04-13 | 2016-08-24 | 苏州立旭智能电气有限公司 | Voltage-dividing type harmonic suppression device |
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