CN104981067B - A kind of LED driver - Google Patents
A kind of LED driver Download PDFInfo
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- CN104981067B CN104981067B CN201510395788.5A CN201510395788A CN104981067B CN 104981067 B CN104981067 B CN 104981067B CN 201510395788 A CN201510395788 A CN 201510395788A CN 104981067 B CN104981067 B CN 104981067B
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Abstract
The present invention provides a kind of LED driver and passed through for different types of output signal, the different filter branch of distribution is filtered respectively to all kinds of output signals, each filter branch is enabled targetedly to carry out device selection and parameter setting, more in the prior art using for single filter circuit, taking into account cost, volume and more preferable filter effect is reached on the basis of the life-span, be conducive to the electric current of LED load constant, will not caused by the discontinuous operation or dynamic pulse signal of high frequency switch power LED load flicker or damage.
Description
Technical field
The present invention relates to LED driver technical field, more particularly to a kind of LED driver.
Background technology
Filter circuit used in the output end of LED driver is relatively simple in the prior art, such as simple in LED drivings
The output end parallel electrolytic electric capacity of device.In general, if the control mode that LED driver is used is smaller for load power demand
The higher VFC mode of switching frequency, referring to Fig. 1, the output signal of LED driver in addition to switch frequency signal S1,
It is also possible to be superimposed discontinuous operation frequency signal S2 and dynamic pulse signal S3, concrete reason is：Power is smaller needed for LED load
In the case of, LED driver is limited by the highest frequency upper limit, can be in low frequency discontinuous operation pattern, now, LED driver
Output signal also include discontinuous operation frequency signal；When LED driver input power has dynamic disturbances, the disturbance can also be passed
Its output end is handed to, now, the output signal of LED driver also includes dynamic pulse signal.In order to not influence LED load just
Often work, it is desirable to which the output end filter circuit of LED driver can play filter action to three of the above signal.
Because the frequency or type of three of the above signal are different, only may not be in design using only single wave filter
Optimal；For example in the case of being filtered using only electrochemical capacitor, because the reliability of electrochemical capacitor and life-span are electric by switching harmonics
The limitation of stream, if in order to meet drop volume requirement of the electrochemical capacitor to switch ripple current, the capacitance of electric capacity can be than larger, it will
So that the filter circuit volume of LED driver is big, cost is high；If using only high frequency capacitance, although its switching harmonics electric current is held
Larger by ability, but limited by its manufacture craft, its capacity is smaller, thus with high frequency capacitance meet driver low frequency between knock off
The Large Copacity of operation mode needs, and cost can be very high.
How the output of LED load normal work is influenceed in control cost, volume and on the basis of the life-span to filter out
Signal is a problem urgently to be resolved hurrily.
The content of the invention
In view of this, it is big and cost is a height of with volume in the prior art to solve the invention provides a kind of LED driver
The problem of cost is to ensure filter effect.
A kind of LED driver, including：Output end connects the high frequency switch power of LED load, is connected to the HF switch
The first filter branch and the second filter branch between two output ends of power supply；
Wherein, the output signal of the high frequency switch power includes discontinuous operation frequency signal and dynamic pulse signal extremely
Few one and switch frequency signal, the frequency of the switch frequency signal are more than the frequency of the discontinuous operation frequency signal；
First filter branch and second filter branch are connected in parallel, and second filter branch includes series connection and connected
The impedance adjustment unit and filter unit connect；
Energy storage member in impedance, first filter branch and the filter unit by setting the impedance adjustment unit
The parameter of part so that the component that the switch frequency signal flows through first filter branch filters branch more than flowing through described second
The component on road so that the discontinuous operation frequency signal and the dynamic pulse signal flow through the component of first filter branch
Respectively less than flow through the component of second filter branch.
It is preferred that, the impedance adjustment unit is inductance or resistance.
It is preferred that, first filter branch includes high frequency capacitance, and the filter unit includes electrochemical capacitor, the electrolysis
The capacitance of electric capacity is more than the capacitance of the high frequency capacitance.
It is preferred that, the high frequency capacitance is high-frequency film electric capacity.
It is preferred that, the high frequency capacitance is patch capacitor.
It is preferred that, second filter branch also includes the diode in parallel with the impedance adjustment unit, two pole
Sense of current when sense of current when pipe is turned on discharges for the filter unit.
It is preferred that, the high frequency switch power includes the AC/DC modules and DC/DC modules being sequentially connected in series.
The LED driver that the present invention is provided is by for different types of output signal, distributing different filter branch pair
All kinds of output signals are filtered respectively so that each filter branch can targetedly carry out device selection and parameter setting,
Use more in the prior art for single filter circuit, taking into account cost, volume and more preferable filter is reached on the basis of the life-span
Ripple effect, is conducive to the electric current of LED load constant, will not be made because of the discontinuous operation or dynamic pulse signal of high frequency switch power
Into the flicker or damage of LED load.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the signal output waveform figure of 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 another LED driver structural representation disclosed in the embodiment of the present invention；
Fig. 4 is another LED driver structural representation disclosed in the embodiment of the present invention；
Fig. 5 is another LED driver structural representation disclosed in the embodiment of the present invention；
Fig. 6 is another LED driver structural representation disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The invention provides a kind of LED driver, to solve in the prior art so that volume is big and a height of cost of cost reaches
The problem of to more preferable filter effect.
A kind of LED driver, as shown in Fig. 2 including：Output end connects the high frequency switch power 101 of LED load, connection
The first filter branch 102 and the second filter branch 103 between two output ends of high frequency switch power 101；
Wherein, the output signal of high frequency switch power 101 includes discontinuous operation frequency signal and dynamic pulse signal extremely
Few one and switch frequency signal, the frequency of the switch frequency signal are more than the frequency of the discontinuous operation frequency signal；
First filter branch 102 and the second filter branch 103 are connected in parallel, and the second filter branch 103 includes being connected in series
Impedance adjustment unit 301 and filter unit 302；
Energy-storage travelling wave tube in impedance, the first filter branch 102 and filter unit 302 by setting impedance adjustment unit 301
Parameter so that the switch frequency signal flow through the first filter branch 102 component be more than flow through the second filter branch 103
Component so that the component that the discontinuous operation frequency signal and the dynamic pulse signal flow through the first filter branch 102 is small
In the component for flowing through the second filter branch 103.
It is worth noting that, only limiting the impedance set-up mode of impedance adjustment unit 301, the first filter branch 102 here
With the parameter setting mode of energy-storage travelling wave tube in filter unit 302, without limit impedance adjustment unit 301, the first filter branch 102
With the particular circuit configurations of filter unit 302.In other words, only with the filter branch of the first filter branch 102 and second of the invention
103 parallel filtering circuit structure, have ignored the impedance set-up mode and the parameter setting mode will be difficult to solve background
The problem of being proposed in technology.
Concrete operating principle is as follows：
The impedance value of (1) second filter branch 103 is the resistance of the impedance value and filter unit 302 of impedance adjustment unit 301
Anti- value sum, by setting the impedance value of impedance adjustment unit 301 so that the impedance value of the second filter branch 103 is more than the first filter
The impedance value of ripple branch road 102, so that various types of signal (including the switching frequency in the LED driver output signal
Signal, the discontinuous operation frequency signal and the dynamic pulse signal) preferential the first filter by two parallel branch
Ripple branch road 102.In other words, the impedance adjustment unit 301 in the second filter branch 103 does not strobe mainly, but to institute
State various types of signal and play a part of preferred filter paths.
(2) it is well known that common filter circuit is to act on realizing that filtering is made by the energy storage of the energy-storage travelling wave tube in it
, such as one square-wave signal via filter circuit filter action, when in a cycle of square-wave signal, its high period
Between filter circuit store energy be equal to its low period between filter circuit discharge energy when, then the square-wave signal can be filtered
Wave circuit filters into direct current signal.Therefore, by setting the first filter branch 102 and the filter circuit (the second filter branch
103) parameter of energy-storage travelling wave tube in, enables to the energy storage capacity of the first filter branch 102 to be less than the filter circuit (the second filter
Ripple branch road 103) energy storage capacity, that is, cause the first filter branch 102 filter capacity be less than the filter circuit (second filtering
Branch road 103) filter capacity.
Set with reference to the difference of two filter branch energy storage capacities in the setting of preferred filter branch in above-mentioned (1) and (2), when
When the energy of one signal is less than the energy storage capacity of the first filter branch 102, the signal flows through the component of the first filter branch 102
More than the component for 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
When, due to being limited to the filter capacity of the first filter branch 102, the signal can only select to flow through the second filter branch 103, i.e., should
Signal flows through component of the component more than the first filter branch 102 of the second filter branch 103.
Why a certain signal will not be all because two filter branch are to be connected in parallel by wherein one filter branch
Relation, the voltage based on parallel connectivity is equal, preferentially by filter branch all the way in the case of, remaining road filter branch
Also by the fraction signal.
It should be noted that referring to Fig. 1, switch frequency signal S1 in the output signal of high frequency switch power 101, knock off
Working frequency signal S2, dynamic pulse signal S3 three compare from energy point of view, one because the frequency higher cycle smaller be
Low energy signal, because frequency relatively low cycle more greatly high energy signals both the, the third party is because of amplitude more greatly high-energy
Signal.
Therefore set by the impedance of impedance adjustment unit 301 so that the impedance value of the second filter branch 103 is more than first
The impedance value of filter branch 102；Pass through the parameter setting of energy-storage travelling wave tube in the first filter branch 102 and filter unit 302 so that
The filter capacity of first filter branch 102 is less than the filter capacity of the second filter branch 103, and then realizes switch frequency signal S1
(low energy signal) flows through component of the component more than the second filter branch 103 of the first filter branch 102, discontinuous operation frequency letter
The component that number S2 and dynamic pulse signal S3 (high energy signals) flows through the second filter branch 103 is all higher than flowing through the first filtering branch
The component on road 102.
In summary, the technical scheme that the present invention is provided is by for different types of output signal, distributing different filters
Ripple branch road is filtered respectively to all kinds of output signals so that each filter branch can targetedly carry out device selection and ginseng
Number is set, and is used more in the prior art for single filter circuit, is being taken into account cost, volume and reached more on the basis of the life-span
Good filter effect, is conducive to the electric current of LED load constant, will not be because of the discontinuous operation or dynamic of high frequency switch power 101
Pulse signal causes the flicker or damage of LED load.
It is preferred that, as shown in figure 3, impedance adjustment unit 301 is resistance R, resistance R resistance can be set to be more than the first filter
The equiva lent impedance of ripple branch road 102 so that the equiva lent impedance of the second filter branch 103 where resistance R is more than the first filter branch
102 equiva lent impedance, so as to play signal to be filtered by the first filter branch 102 and the parallel connection of the second filter branch 103
Into filter circuit when, preferably pass through the first filter branch 102.
Or, as shown in figure 4, impedance adjustment unit 301 is inductance L.Here inductance L mainly hinders the work of electric current using it
With, that is, increase the effect of the impedance of the second filter branch 103, rather than its energy storage is acted on.
Specifically, the LED driver, as shown in figure 5, the first filter branch 102 is high frequency capacitance C1, filter unit
302 be electrochemical capacitor C2；
Electrochemical capacitor C2 capacitance is more than high frequency capacitance C1 capacitance.
Specifically operation principle is：
Electrochemical capacitor C2 capacity is generally more than (or even much larger than) high frequency capacitance C1 capacity, between the two
Difference is not specifically limited herein, depending on its visual concrete application environment.
Electrochemical capacitor C2 capacity is more than high frequency capacitance C1 capacity, due to electrochemical capacitor C2 intrinsic series equivalent resistance
Resistance is generally smaller, electric capacity electrochemical capacitor C2 impedance is much smaller than high frequency capacitance C1.If high frequency capacitance C1 and electrolysis
Electric capacity C2 is directly in parallel, and the larger high frequency ripple current (switch frequency signal) of high frequency switch power output will mainly flow through electricity
Electric capacity C2 is solved, then can not reduce the high frequency ripple current for flowing through electrochemical capacitor C2.
The LED driving filter circuits that the present embodiment is provided, the frequency of the switch frequency signal of high frequency switch power is f
When, high frequency capacitance C1 equiva lent impedance is 1/ (2 π fC1), and the impedance of impedance adjustment unit 301 is designated as Z, then Z+ [1/ (2 π fC2)]
>1/ (2 π fC1), i.e. the equiva lent impedance of impedance adjustment unit 301 and electrochemical capacitor C2 series arm will be greater than high frequency capacitance C1
Equiva lent impedance.The larger switching frequency ripple current (switch frequency signal) that now high frequency switch power 101 is exported, by master
Flow through high frequency capacitance C1 (its connect equivalent resistance smaller), and impedance adjustment unit 301 and electrochemical capacitor C2 series connection branch
The switching frequency ripple current on road is less, because electrochemical capacitor C2 ESR equivalent resistances are larger, when flowing through opening for electrochemical capacitor C2
When pass ripple current is smaller, the loss of its equivalent resistance can be effectively reduced, suppresses the temperature rise that the loss of equivalent resistance is brought, so that
Extend electrochemical capacitor C2 life-span.According to filtering mode of the prior art, all switches of high frequency switch power output
Frequency ripple current is all filtered by electrochemical capacitor, and the loss on the equivalent resistance of electrochemical capacitor is larger, and temperature rise is also larger, Yi Yin
Play the explosion of electrochemical capacitor or shorten the life-span of electrochemical capacitor.
What deserves to be explained is, for the VFC mode based on background technology medium-high frequency Switching Power Supply, HF switch electricity
Source can enter discontinuous operation pattern in the case of underloading, that is, work a period of time, stop a period of time, by the high frequency capacitance C1
The limitation of energy storage capacity, if without the second filter branch 103, it will the LED load electric current being attached thereto is cut in and out, easily production
Raw low frequency stroboscopic situation.Now, the discontinuous operation frequency signal S2 that high frequency switch power 101 is exported needs to rely on electrochemical capacitor C2
It is specifically that electrochemical capacitor C2 storage energies stop in high frequency switch power 101 when high frequency switch power 101 works to filter
During work, electrochemical capacitor C2 releases energy to LED load so that LED load no matter high frequency switch power 101 work with
It can continue to obtain constant current in the case of no, be not in low frequency stroboscopic naturally.
In addition, the dynamic pulse signal S3 in background technology is transferred to its output end by high frequency switch power 101, by height
The limitation of frequency electric capacity C1 energy storage capacities, will also rely on the electrochemical capacitor C2 in the second filter branch 103 to absorb, to prevent this big
Energy signal is directly over LED load, causes LED load to be damaged.
It is preferred that, as shown in fig. 6, the LED driver is also included with impedance adjustment unit 301, (example is electricity in this figure
Hinder R) in parallel diode D, sense of current when diode D is turned on is that (example is electrochemical capacitor to filter unit 302 in this figure
Sense of current when C2) discharging.
Under normal circumstances, electrochemical capacitor C2 charge and discharge process passes through resistance R；But exported when with the LED driver
When there is short trouble in the connected LED load in end, the output current of the LED driver can instantaneous rapid increase, in resistance R two
The diode D of sense of current when holding sense of current during turned in parallel for electrochemical capacitor C2 electric discharges so that big electricity during failure
Stream flows through diode D, forms high current path, and then avoid resistance R from being burnt out because transient power is excessive.
As shown in fig. 6, the high frequency switch power includes the AC/DC modules and DC/DC modules being sequentially connected in series, AC/DC moulds
Alternating current input power supplying is converted to dc source by block, and DC/DC modules are converted to the dc source of input the electricity needed for LED load
Pressure and electric current.
It is preferred that, high frequency capacitance C1 is high-frequency film electric capacity.
Or, high frequency capacitance C1 is patch capacitor.
In specific practical application, high frequency capacitance C1 can be non-electrolytic capacitor：High-frequency film electric capacity or paster electricity
Hold, such as ceramic disc capacitor is not specifically limited herein, depending on its concrete application environment.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
1. a kind of LED driver, it is characterised in that including：Output end connects the high frequency switch power of LED load, is connected to institute
State the first filter branch and the second filter branch between two output ends of high frequency switch power；
Wherein, the output signal of the high frequency switch power includes at least the one of discontinuous operation frequency signal and dynamic pulse signal
Person and switch frequency signal, the frequency of the switch frequency signal are more than the frequency of the discontinuous operation frequency signal；
First filter branch and second filter branch are connected in parallel, and second filter branch includes what is be connected in series
Impedance adjustment unit and filter unit；
Energy-storage travelling wave tube in impedance, first filter branch and the filter unit by setting the impedance adjustment unit
Parameter, makes the impedance value of second filter branch be more than impedance value, first filter branch of first filter branch
Energy storage capacity be less than second filter branch energy storage capacity, and then cause the switch frequency signal flow through described first
The component of filter branch, which is more than, flows through the component of second filter branch so that the discontinuous operation frequency signal and described dynamic
The component that state pulse signal flows through first filter branch is respectively less than the component for flowing through second filter branch.
2. LED driver according to claim 1, it is characterised in that the impedance adjustment unit is inductance or resistance.
3. LED driver according to claim 1, it is characterised in that first filter branch includes high frequency capacitance, institute
Stating filter unit includes electrochemical capacitor, and the capacitance of the electrochemical capacitor is more than the capacitance of the high frequency capacitance.
4. LED driver according to claim 3, it is characterised in that the high frequency capacitance is high-frequency film electric capacity.
5. LED driver according to claim 3, it is characterised in that the high frequency capacitance is patch capacitor.
6. LED driver as claimed in any of claims 1 to 5, it is characterised in that second filter branch is also
Including the diode in parallel with the impedance adjustment unit, the sense of current during diode current flow is put for the filter unit
Sense of current when electric.
7. LED driver according to claim 1, it is characterised in that the high frequency switch power includes what is be sequentially connected in series
AC/DC modules and DC/DC modules.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN104981067A CN104981067A (en) | 2015-10-14 |
| CN104981067B true CN104981067B (en) | 2017-09-26 |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009135595A (en) * | 2007-11-28 | 2009-06-18 | Sony Corp | Switched capacitor circuit, switched capacitor filter, and sigma-delta a/d converter |
| BRPI0900726B1 (en) * | 2009-03-10 | 2019-04-24 | Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda | SINGLE INDUCTION MOTOR CONTROL SYSTEM AND SINGLE INDUCTION MOTOR CONTROL METHOD |
| TWI455432B (en) * | 2012-01-20 | 2014-10-01 | Macroblock Inc | Dynamic damper module for a driving circuit |
| CN203708103U (en) * | 2014-01-14 | 2014-07-09 | 艾默生网络能源有限公司 | Electromagnetic interference (EMI) filter and switching power supply |
| CN204258608U (en) * | 2014-09-01 | 2015-04-08 | 成都芯源系统有限公司 | Ripple suppression circuit and circuit system comprising same |
| CN104754830A (en) * | 2015-03-26 | 2015-07-01 | 谢晶 | Light dimming circuit |
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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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