CN108633123A - Filter buffer circuit, with its lighting device and for the power supply of lighting device - Google Patents
Filter buffer circuit, with its lighting device and for the power supply of lighting device Download PDFInfo
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- CN108633123A CN108633123A CN201710160458.7A CN201710160458A CN108633123A CN 108633123 A CN108633123 A CN 108633123A CN 201710160458 A CN201710160458 A CN 201710160458A CN 108633123 A CN108633123 A CN 108633123A
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- buffer circuit
- circuit
- filtering
- capacitor
- lighting device
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
This application provides a kind of filtering buffer circuits (20).It includes snubber resistor (21) and buffer condenser (34) to filter buffer circuit (20), wherein buffer condenser (34) is LC filter circuits (34).
Description
Technical field
The present invention relates to a kind of filtering buffer circuit, a kind of lighting devices and one kind with filtering buffer circuit with filter
The power supply of wave buffer circuit.
Background technology
When electronic device is connected to electronic unit (such as light modulating device) as capacity load, electronic device it is defeated
Enter electric current often to vibrate.These oscillations can usually cause the damage of electronic device even to damage.Further, since these are vibrated, it is defeated
Very small value can be dropped to by entering electric current, even across zero-point voltage.Therefore, input current can drop to the dimension of capacity load
Hold electric current or less.
Drop to the failure for maintaining electric current or less that can lead to electronic device.Especially electronic device be lighting device (for example,
LED light etc.) and capacity load be with bidirectional thyristor and/or alternating current triode (TRIAC) (for example, forward position dims
Device) light modulating device in the case of, oscillation can cause due to along the electric current of light modulating device decline caused by by lighting device
The flicker of the light of transmitting.
To solve the above-mentioned problems, especially flicker problem may include buffer circuit in electronic device.Conventional buffering electricity
The resistor-capacitor circuit connecting with the power sources in parallel of circuit is route to constitute.In this way, the input current of electronic device
It is always above the maintenance electric current of capacity load.
However, conventional buffer circuit has the shortcomings that.As an example, being needed more due to welding more electronic units
More production stages and more built-up times, so two electronic units of addition are (that is, the resistor and capacitance of buffer circuit
Device) cause the production cost (so-called BOM costs, BOM are the abbreviations of " bill of materials ") of each device to increase.Especially for
It produces in batches for for the device of mass production, this is very unfavorable.
In addition, in the case where electronic device is lighting device, the thin film capacitor (film of the socket of lighting device
Cap) it is typically used as buffer condenser.However, since socket (insert by the E27 screw sockets for being especially commonly used in so-called LED incandescent lamps
Seat) size it is very big, the size of buffer condenser is also very big, so as to cause unnecessary loss.
Even more seriously, the high temperature in electronic device (especially in lighting device) can be due to the temperature of buffer condenser
Sensibility and the capacitance for influencing buffer condenser.This can cause unstable in electronic device.
In addition, high surge current may be about subjected to (also referred to as per 10ms by being currently used in the buffer condenser of lighting device
Inrush current).Due to piezoelectric effect, this is produced for the unwanted audible noise of Client application institute.
Invention content
In view of the disadvantages mentioned above of conventional buffer circuit, the object of the present invention is to provide a kind of less sensitive to high temperature and can be with
The buffer circuit produced in a manner of cost-effective.It is a further object to provide with less sensitive to high temperature and can be with
A kind of lighting device for the buffer circuit that cost-effective mode produces and a kind of power supply.
The purpose according to the filtering buffer circuit, lighting device and power supply of independent claims by realizing.Appurtenance
Profit requires, the description and the appended drawings give preferred embodiment.
It thus provides a kind of filtering buffer circuit.It includes snubber resistor and buffer condenser to filter buffer circuit.It is slow
It is LC filter circuits to rush capacitor.That is, buffer condenser is with inductor (hereafter also called LC filter inductances
Device) and capacitor (hereafter also called LC filter condensers) resonance circuit.
The key idea of the present invention is to be multiplexed the LC filter condensers of LC filter circuits, so that it also provides buffering electricity
The function of the capacitor on road.LC filter circuits may be needed in entire circuit, to reduce the electromagnetic interference in circuit (EMI),
To improve and the relevant Electronic Performance of such as power supply.LC filter circuits may be adapted to be connected to LC filtering to coming to be provided to
The high fdrequency component and/or low frequency component of the signal of the electronic device of circuit are filtered.
By confirming that LC filter circuits with equiva lent impedance and thereby with equivalent capacitance value, can provide while have slow
Rush the general-purpose capacitor of the function of capacitor and LC filter condensers.LC filter circuits and snubber resistor collectively form tool
There is the resistor-capacitor circuit of suitable with the conventional performance of buffer circuit or identical performance.Due to being multiplexed LC filtered electricals
Container, so with conventional buffer circuit compared with the combination of conventional LC filter circuits, the quantity of electronic unit reduces, and filters
Wave buffer circuit is compacter.
Therefore, filtering buffer circuit is simultaneously as routine LC filter circuits and conventional buffer circuit, wherein conventional LC filtering
For circuit for being filtered to the high-frequency signal from power supply, conventional buffer circuit prevents the main circuit current from electronic circuit
Less than the maintenance electric current for the light modulating device or switching device that can be connect with filtering buffer circuit.
Due to filtering the cramped construction of buffer circuit, so the filtering buffer circuit in electronic device needs smaller sky
Between.In addition, the reduction of electronic unit quantity realizes the reduction of the job step needed for assembling buffer circuit, this reduces slow
Rush the cost of circuit.
Especially it is possible that filtering buffer circuit only includes snubber resistor and the LC filtered electricals as buffer condenser
Road.In other words, filtering buffer circuit can be made of snubber resistor and buffer condenser.Here and hereinafter, if it is electric
Route electronic component " composition ", then the circuit can be only including these electronic units and for these electronic units are mutually electric
The additive wire for connecting and being electrically connected with the other electronic unit outside circuit.
According to the preferred embodiment of filtering buffer circuit, LC filter circuits include LC filter inductors and LC filter capacitors
Device.LC filter condensers have the first capacitor and the second capacitor.First capacitor is connected in parallel with the second capacitor.LC is filtered
Wave capacitor may include the other capacitors being connected in parallel with the first capacitor and/or the second capacitor.Preferably, first
Capacitor and the second capacitor are dimensionally different.It, can be by properly selecting this extremely by using at least two capacitors
Lack the value of two capacitors highly precisely to adjust the value of entire LC filter condensers.LC filter circuits can also include can be with
Cause the LC filter resistors of damping in circuit.Preferably, LC filter inductors and LC filter condensers are buffered about filtering
The input terminal of circuit is connected in series with.
According at least one embodiment of filtering buffer circuit, filtering buffer circuit does not have any other capacitor.
That is filtering buffer circuit only includes the LC filter condensers being made of at least two capacitors being connected in parallel.
According at least one embodiment of filtering buffer circuit, the first capacitor of LC filter condensers and/or the second electricity
Container has the function of buffer condenser.That is, being multiplexed the first capacitor and/or the second capacitor.Here, LC is filtered
The equiva lent impedance of circuit can be corresponding with the impedance of buffer condenser.
In addition, as an alternative, LC filter inductors can help to improve the performance of buffer condenser.Namely
It says, LC filter condensers (preferably, including the first capacitor and the second capacitor) and LC filter inductors both can be by
Multiplexing, to provide buffer condenser for buffer circuit.By being multiplexed LC filter circuits, buffer condenser has more available
Value, this is because the value of the value of different LC filter inductors and LC filter condensers can be combined.This realizes essence
The value for really adjusting buffer condenser, so as to improve the performance of filtering buffer condenser.
According at least one embodiment, filtering buffer circuit includes at least one input terminal.Input terminal may be adapted to and filter
The power supply of buffer circuit is connected.Snubber resistor is connected in series with at least one input terminal.In contrast, conventional buffer circuit
Snubber resistor is usually connected in parallel with input terminal.The position for changing snubber resistor relative to input terminal is permissible by buffering electricity
Resistance device is used together with LC filter circuits.
According at least one embodiment of filtering buffer circuit, LC filter circuits and/or LC filter inductors and buffering electricity
Resistance device is connected in series with.In addition, LC filter circuits can be connected in series with at least one input terminal.In contrast, conventional buffer circuit
Buffer condenser be usually connected in parallel with input terminal.However, allowing to combine LC filter condensers to high-frequency signal due to existing
The LC filter inductors being filtered, so different electric connection modes can be suitable.
Filtering buffer circuit may include at least one output end.At least one output end can be with LC filter circuits simultaneously
Connection connection.Electronic circuit (such as consumption circuit and/or lighting circuit with light modulating device) can be at least one output
End is connected.At least one output end can be connected to the transformer of isolation.
At least one input terminal can be connected to power supply (for example, Switching Power Supply).Filtering buffer circuit can protect electronics
Circuit is from high-frequency signal (the especially spike caused by power supply).Meanwhile filter buffer circuit can inhibit it is undesirable
Oscillation is transferred into electronic circuit.That is, filtering buffer circuit has conventional LC filter circuits and conventional buffering electricity simultaneously
The function on road.
According to preferred embodiment, filtering buffer circuit includes at least one output end.At least one output end is suitable
In being connected to light modulating device (especially leading edge dimmer).In addition, as an alternative, at least one output end can
It is adapted to be coupled to electronic circuit (for example, lighting circuit).
Preferably, leading edge dimmer is so-called phase-cut dimmer or TRIAC light modulators.Under normal conditions, to forward position tune
Light device provides sine voltage signal.After input voltage crosses point of zero voltage, input voltage increases.It is increasing therebetween, forward position tune
Light device inhibits the output of the electronic unit to wanting modulated light for a period of time, is transmitted to the energy of control to electronic unit.It is on the contrary
As the same, output is inhibited a period of time by trailing edge dimmer before voltage gets over zero crossing.In general, along light modulation after leading edge dimmer ratio
Device is less expensive more reliable.
Further it is provided that a kind of lighting device.Preferably, lighting device includes filtering buffer circuit according to the present invention.
That is, disclosed be disclosed with the filtering relevant all features of buffer circuit also for lighting device, vice versa.
Therefore, lighting device includes that there is the filtering of snubber resistor, buffer condenser and at least one output end to buffer
Circuit.Buffer condenser is LC filter circuits.In addition, lighting device includes having light modulating device and at least one light emitting diode
Lighting circuit.Lighting circuit is connected at least one output end of filtering buffer circuit.
Light modulating device may include thyristor and/or TRIAC.Particularly, light modulating device is applicable to that luminous two will be provided to
The electric current and/or voltage of pole pipe are adjusted.Preferably, light modulating device is leading edge dimmer.
Filtering buffer circuit is used to have the advantages that in lighting device several.For example, by using with LC filter capacitors
The LC filter circuits of device (at least with the first capacitor and the second capacitor), the equivalent capacitance value of LC filter circuits increase, from
And provide better light modulator compatibility.
According at least one embodiment, lighting device further includes power supply.Filtering buffer circuit is connected to power supply and power for illumination
Between road so that be filtered to the high fdrequency component from power supply by filtering buffer circuit.Power supply can be Switching Power Supply.By
The electric current that power supply provides can have high fdrequency component (for example, spike).It, can due to the LC filter circuits in filtering buffer circuit
To remove these high fdrequency components from the electric current provided.
Further it is provided that a kind of power supply for lighting device.Preferably, power supply includes filtering buffering according to the present invention
Circuit.Moreover it is preferred that power supply is suitable for providing electric current and/or voltage to lighting device according to the present invention.That is, institute
Disclosed to be disclosed also for power supply with filtering buffer circuit and/or the relevant all features of lighting device, vice versa.
Therefore, power supply includes having the filtering of snubber resistor and the buffer condenser as LC filter circuits buffering electricity
Road.In addition, power supply includes at least one output end for power supply to be connected to lighting device.For example, described at least one defeated
Outlet can be connected to a part for the isolation voltage device of lighting device.Lighting device may include with light modulating device and extremely
The lighting circuit of a few light emitting diode.
Filtering buffer circuit can also be included therein capacity load and high fdrequency component can cause failure and/or damage
In other electronic devices.For example, filtering buffer circuit can be used in power supply changeover device, electric ballast and/or transformer.
Description of the drawings
Illustrate the preferred embodiment of the present invention below with reference to the accompanying drawings.
Fig. 1 shows the electronic circuit of the exemplary embodiment of filtering buffer circuit according to the present invention.
Fig. 2 shows the electronic circuits for the exemplary embodiment for substituting buffer circuit.
Fig. 3 A, Fig. 3 B and Fig. 3 C show the changing currents with time curve of the exemplary embodiment of buffer circuit.
Fig. 3 D show the time-varying voltage characteristic of leading edge dimmer.
Fig. 4 A and Fig. 4 B respectively illustrate the electronic circuit of the exemplary embodiment of filtering buffer circuit according to the present invention
With the changing currents with time characteristic and time-varying voltage characteristic of the simulation of the exemplary embodiment.
Fig. 5 A and Fig. 5 B respectively illustrate the electronic circuit and the exemplary reality for the exemplary embodiment for substituting buffer circuit
Apply the changing currents with time characteristic and time-varying voltage characteristic of the simulation of example.
Specific implementation mode
Hereinafter, the preferred embodiment of the present invention will be described with reference to the drawings.Here, identical, similar in attached drawing or have
The element of same or similar effect is provided with identical reference numeral.The figure of element shown in the accompanying drawings and ruler each other
Very little relationship is not considered as proportional.On the contrary, individual component can be shown with the size of amplification, enable to more
It illustrates and/or more fully understands well.
With reference to the circuit diagram of figure 1, the exemplary embodiment of filtering buffer circuit 20 according to the present invention is described in detail.Filtering
Buffer circuit 20 includes snubber resistor 21 and the buffer condenser as LC filter circuits 34.LC filter circuits 34 are filtered including LC
Wave inductor 31 and LC filter condensers.In the present embodiment, LC filter condensers are by the first capacitor 41 and the second capacitor
42 are constituted.However, may exist the capacitor of different number in LC filter condensers.
It further includes two input terminals 11,12 and two output ends 101,102 to filter buffer circuit 20.Input terminal 11 and input
End 12 is adapted to be coupled to power supply.Output end 101 and output end 102 are adapted to be coupled to have at least one light emitting diode
Lighting device electronic device 10.Electronic device 10 can also include light modulating device (not shown).
In the present embodiment, input terminal 11 and input terminal 12 are constituted via input resistor 22 and by four diodes 501
Rectification circuit 50 be connected to filtering buffer circuit 20 main circuit.Four diodes 501 can have different values for adjusting
The characteristic of whole current circuit 50.
Snubber resistor 21 and LC filter circuits 34 are connected in series with input terminal 11,12.In addition, LC filter circuits 34 with it is defeated
Outlet 101,102 is connected in parallel.
As described hereinafter, LC filter circuits 34 can have the function of capacitor.The impedance of LC filter inductors is XL=
ω L, and the impedance of LC filter condensers 41,42 is XC=(ω C1/2)-1, wherein ω is the frequency of input signal, and L is LC filters
The inductance value of wave inductor 31, C1/2It is the capacitance of the first capacitor 41 or the second capacitor 42 respectively.By considering the first electricity
Container 41 and the second capacitor 42 are connected in parallel, then the equiva lent impedance of LC filter circuits 34 can be written as：
It can be by appropriateThe each capacitance C of selection1And C2And inductance value L comes
Adjust the equiva lent impedance.Therefore, LC filter circuits 34 can provide the function of buffer condenser and high frequency filter simultaneously.
With reference to the circuit diagram of figure 2, the exemplary embodiment for substituting buffer circuit 20 ' is described in detail.Filtering with Fig. 1 buffers
Circuit 20 is compared, the replacement buffer circuit 20 ' of Fig. 2 include have be serially connected after it is whole again with input terminal 11,12 simultaneously
The conventional buffer circuit for substituting snubber resistor 23 and substituting buffer condenser 43 of connection connection.Buffer circuit 20 ' is substituted also to wrap
Include the LC filter circuits 34 being connected in parallel with conventional buffer circuit.Therefore, it substitutes buffer circuit 20 ' and needs additional replacement buffering
Capacitor 43, to provide the effect of buffer circuit and LC filter circuits simultaneously.
Filtering buffering electricity according to the present invention is described in detail in the changing currents with time with reference to shown in figure 3A, Fig. 3 B and Fig. 3 C
Road 20.Electric current is provided with arbitrary unit (a.u.) shown in Fig. 3 A, Fig. 3 B and Fig. 3 C.
Here, Fig. 3 A show the electronics that leading edge dimmer is connected in the case of no any buffer circuit 20,20'
The changing currents with time 611 of device 10 (especially lighting device).Electric current 611 has even zeroaxial intense oscillations.Especially
In the case where electronic device 10 is lighting device, this oscillation can lead to the intense flashes of the light emitted by lighting device.
Fig. 3 B show the time-varying buffer current 62 of buffer circuit 20,20 '.Electric current 62 follows resistor-capacitor circuit
Common step response, i.e. I (t)=exp (- t/RC), wherein R be snubber resistor 21,23 resistance value, C be buffering capacitance
The capacitance of device 34,43.
Fig. 3 C show the changing currents with time 612 of the electronic circuit of A according to fig. 3, but introduce buffering electricity in circuit at this time
Road 20,20 '.Buffer circuit 20,20 ' improves entire current level, to prevent electric current 612 by zero, therefore prevents from dodging
It is bright.
With reference to the time-varying voltage 63,64 of figure 3D, detailed description is combined with filtering buffer circuit 20 according to the present invention to be made
Leading edge dimmer.Each voltage is provided with arbitrary unit (a.u.).The figure shows the input as light modulator and by adjusting
Light device is changed into the sinusoidal voltage 64 of the rule of dimmer output voltage 63.Ahead of the curve in light modulator, voltage by zero it
In certain time period afterwards, voltage is suppressed.
With reference to figure 4A and Fig. 5 A circuit diagram and Fig. 4 B and Fig. 5 B in changing currents with time 81,81 ' curve and when power transformation
Filtering buffer circuit 20 according to the present invention is described in detail in the curve of pressure 82,82 '.
The circuit diagram of principle figure 4 above A and Fig. 5 A are corresponding with the circuit diagram of Fig. 1 and Fig. 2 respectively.Fig. 4 A are shown according to this
The filtering buffer circuit 20 of invention, and Fig. 5 A show and substitute buffer circuit 20 '.In Fig. 4 A and Fig. 5 A, buffer circuit 20
It is connected to the ground 71 with the respective rectification circuit of buffer circuit 20 ' 50.In addition, buffer circuit 20,20 ' include output end 101,
102。
The circuit diagram of Fig. 4 A and Fig. 5 A distinguish analog buffer circuit for the circuit simulation software using entitled LTSpice
20 and buffer circuit 20 ' current characteristics and voltage characteristic.In simulations, it is carried respectively to buffer circuit 20 and buffer circuit 20 '
For step voltage, and output voltage 82,82 ' and output current 81,81 ' are modeled as to the function of time.As a result it is shown respectively
In Fig. 4 B and Fig. 5 B.
For filtering buffer circuit 20 and substitute buffer circuit 20 ', analog voltage 82,82 ' rise with the time and
It is saturated after about 0.4ms.Analog current 81,81 ' has peak value after simulating initial time and is dropped to almost after about 0.4ms
It is zero, but without more zero crossing.
For different buffer circuits 20,20 ', when analog current 81,81 ' and analog voltage 82,82 ' are having the same
Become characteristic.In addition, for different buffer circuits 20,20 ', saturation voltage and peak point current are identical.This shows basis
The filtering buffer circuit 20 of the present invention have with include typical resistors-capacitor circuit as buffer replacement buffering it is electric
The identical characteristic of characteristic on road 20 '.
The present invention is not limited to the descriptions based on embodiment.On the contrary, the present invention includes the arbitrary of arbitrary new feature and feature
Combination especially includes the arbitrary combination of the feature in patent claims book, even if this feature or the combination itself do not have
The clear stipulaties in patent claims book or illustrative embodiments.
Reference numerals list
11、12：Input terminal
101、102：Output end
10：Electronic device/lighting device
20：Filter buffer circuit
20’：Substitute buffer circuit
21：Snubber resistor
22：Input resistor
23：Substitute snubber resistor
34：LC filter circuits
31：LC filter inductors
41：First capacitor
42：Second capacitor
43：Substitute buffer condenser
50：Rectification circuit
501：Diode
611：Changing currents with time without buffer circuit
62：The changing currents with time of buffer circuit
612：There is the changing currents with time of buffer circuit
63：The time-varying voltage of leading edge dimmer
64：There is no the time-varying voltage of leading edge dimmer
71：Ground
81：Filter the analog current of buffer circuit
82：Filter the analog voltage of buffer circuit
81’：Substitute the analog current of buffer circuit
82’：Substitute the analog voltage of buffer circuit
Claims (10)
1. a kind of filtering buffer circuit (20), including：Snubber resistor (21) and buffer condenser (34), wherein the buffering
Capacitor (34) is LC filter circuits (34).
2. filtering buffer circuit (20) according to claim 1, wherein the LC filter circuits (34) include LC filtered electricals
Sensor (31) and the LC filter condensers with the first capacitor (41) and the second capacitor (42), wherein first capacitance
Device (41) is connected in parallel with second capacitor (42).
3. filtering buffer circuit (20) according to claim 2, does not have any other capacitor.
4. filtering buffer circuit (20) according to claim 2, wherein first capacitance of the LC filter condensers
Device (41) and/or second capacitor (42) have the function of the buffer condenser (34).
5. filtering buffer circuit (20) according to claim 1 or 2 further includes at least one input terminal (11,12),
In, the snubber resistor (21) is connected in series with at least one input terminal (11,12).
6. filtering buffer circuit (20) according to claim 5, wherein the LC filter circuits and/or LC filtering
Inductor (31) is connected in series with the snubber resistor (21).
7. filtering buffer circuit (20) according to claim 1 or 2 further includes at least one output end (101,102), institute
It states at least one output end (101,102) and is adapted to be coupled to light modulating device, be especially connected to leading edge dimmer.
8. a kind of lighting device, including：
Filtering buffer circuit (20) according to claim 1, at least one output end (101,102), and
Lighting circuit (10), with light modulating device and at least one light emitting diode, wherein
The lighting circuit (10) is connected at least one output end (101,102) of the filtering buffer circuit (20).
9. lighting device according to claim 8 further includes power supply, wherein the filtering buffer circuit (20) is connected to
Between the power supply and the lighting device (10) so that by the filtering buffer circuit (20) to the height from the power supply
Frequency component is filtered.
10. a kind of power supply for lighting device, including filtering buffer circuit (20) according to claim 1 and for will
The power supply is connected at least one output end (101,102) of lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160458.7A CN108633123B (en) | 2017-03-17 | 2017-03-17 | Filter buffer circuit, lighting device with same and power supply for lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160458.7A CN108633123B (en) | 2017-03-17 | 2017-03-17 | Filter buffer circuit, lighting device with same and power supply for lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108633123A true CN108633123A (en) | 2018-10-09 |
| CN108633123B CN108633123B (en) | 2020-11-24 |
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ID=63687014
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710160458.7A Active CN108633123B (en) | 2017-03-17 | 2017-03-17 | Filter buffer circuit, lighting device with same and power supply for lighting device |
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| CN108633123B (en) | 2020-11-24 |
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