CN104902611B - Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit - Google Patents
Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit Download PDFInfo
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- CN104902611B CN104902611B CN201410083409.4A CN201410083409A CN104902611B CN 104902611 B CN104902611 B CN 104902611B CN 201410083409 A CN201410083409 A CN 201410083409A CN 104902611 B CN104902611 B CN 104902611B
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Abstract
Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit.One embodiment of the invention discloses a kind of alternating voltage adjustment circuit, receives an AC-input voltage, includes: a bridged rectifier circuit, for receiving the AC-input voltage to generate a bridge joint rectified signal；One voltage hold circuit is coupled to the bridged rectifier circuit, keeps signal for generating a voltage；And a switchable current source, for providing a current path between the output end and a reference voltage of the voltage hold circuit, wherein the current path is intermittently connected.In addition to this, another embodiment of the present invention further discloses a kind of light-emitting diode luminance adjustment circuit according to above-mentioned alternating voltage adjustment circuit, for controlling the magnitude of current of the light-emitting diode by AC-input voltage power supply.
Description
Technical field
Disclosed embodiment of this invention is related to adjustment circuit more particularly to a kind of alternating voltage adjustment circuit and one kind
Light emitting diode (Light Emitting Diode, LED) brightness regulating circuit.
Background technique
Electronic product (such as LED lamp) generally on the market can be divided into using direct current (Direct
Current, DC) or exchange (Alternating Current, AC) power supply come two kinds of design driving, however due to
The alternating voltage size of various countries is not quite similar, and (such as the U.S. is using 120 volts ACs, and Europe then uses 230 volt ACs
Electricity), therefore generally require to carry out different designs depending on sale country origin or region using the product of AC power source, actually not
Just.
In addition to this, the voltage-regulating circuit of conventional AC power needs to mention by external bulky capacitor or big resistance
For a discharge path, output voltage is caused ad infinitum up to deviate to avoid tired increase of voltage, however, in integrated circuit design
Realize that bulky capacitor or big resistance need biggish area to be laid out.In addition, the output voltage of AC power source is slight upper and lower
Drift may impact the user of some kinds of electronic product, for example, LED lamp may
Therefore it generates and changes in brightness and user is allowed not feel good.In conclusion this field needs a kind of alternating voltage adjustment circuit
To solve the above problems.
Summary of the invention
According to an exemplary embodiment of the invention, it discloses a kind of alternating voltage adjustment circuit and a kind of light emitting diode is bright
Adjustment circuit is spent, to solve the above problems.
First embodiment according to the present invention proposes a kind of alternating voltage adjustment circuit, receives an AC-input voltage, packet
Contain: a bridged rectifier circuit (bridge rectifier), for receiving the AC-input voltage to generate bridge joint rectification letter
Number；One voltage hold circuit (voltage hold circuit), is coupled to the bridged rectifier circuit, keeps for generating a voltage
Signal；And a switchable current source (switched currentsource), it is kept for providing a current path in the voltage
Between the output end of circuit and a reference voltage, wherein the current path system is intermittently connected.
Second embodiment according to the present invention proposes a kind of light-emitting diode luminance adjustment circuit, is handed over for controlling by one
The magnitude of current for flowing a light-emitting diode of input voltage power supply includes: alternating voltage tune as described in claim 1
Whole circuit keeps signal for generating the voltage according to the AC-input voltage；And a current control circuit, it is coupled to the friendship
Voltage-regulating circuit is flowed, and controls the magnitude of current of the light-emitting diode according to voltage holding signal.
Third embodiment according to the present invention proposes a kind of light-emitting diode luminance adjustment circuit, is handed over for controlling by one
The magnitude of current for flowing a light-emitting diode of input voltage power supply includes: alternating voltage adjustment as described in claim 1
Circuit keeps signal for generating the voltage according to the AC-input voltage, and wherein the alternating voltage adjustment circuit also includes:
One comparator is coupled to the voltage hold circuit, keeps signal and a reference value for comparing the voltage, and export one and compare knot
Fruit；And a current control circuit, it is coupled to the alternating voltage adjustment circuit, and keep signal and the ratio according to the voltage
Relatively result controls the magnitude of current of the light-emitting diode.
Alternating voltage adjustment circuit of the invention avoids output voltage from ad infinitum up deviating using novel method, section
It has saved the cost in design and has improved accuracy, it additionally being capable of the different alternating voltage of automatic discrimination.In addition to this, this hair
Bright light-emitting diode luminance adjustment circuit can use above-mentioned alternating voltage adjustment circuit to solve to be supplied by AC-input voltage
The brightness stability problem of the light-emitting diode of electricity.
Detailed description of the invention
Fig. 1 is the schematic diagram of the first exemplary embodiment of an alternating voltage adjustment circuit of the invention.
Fig. 2 is the operation waveform diagram of the first embodiment of the control circuit in Fig. 1.
Fig. 3 is the operation waveform diagram of the second embodiment of the control circuit in Fig. 1.
Fig. 4 is the schematic diagram of an exemplary embodiment of light-emitting diode luminance adjustment circuit of the invention.
Fig. 5 is the schematic diagram of an exemplary embodiment of current control circuit of the invention.
Fig. 6 is the schematic diagram of another exemplary embodiment of current control circuit of the invention.
Fig. 7 is the relation curve of the root-mean-square value and LED current of AC-input voltage when comparison result is 0
Figure.
Fig. 8 is the relation curve of the root-mean-square value and LED current of AC-input voltage when comparison result is 1
Figure.
[symbol description]
100 alternating voltage adjustment circuits
102 bridged rectifier circuits
104 divider
106 voltage hold circuits
108 switchable current sources
1082 current sources
1084 transistors
1086 control circuits
110 comparators
400 light-emitting diode luminance adjustment circuits
402_1~402_N light-emitting diode stacks
404_1~404_N current control circuit
4042 trsanscondutance amplifiers
4044 first trsanscondutance amplifiers
4046 second trsanscondutance amplifiers
4048 selectors
Specific embodiment
Some vocabulary is used in specification and appended claims to censure specific element.This field skill
Art personnel are, it is to be appreciated that manufacturer may call same element with different nouns.This specification and appended right
Claim is not in such a way that the difference of title is as element is distinguished, but with the difference of element functionally as differentiation
Criterion.It is an open term in the "comprising" of specification in the whole text and appended claims mentioned in, therefore answers
It is construed to " including but not limited to ".In addition, " coupling " word is comprising any direct and indirect electrical connection herein.
Therefore, if it is described herein that a first device is coupled to a second device, then this can be directly electrically connected in by representing the first device
Second device, or be electrically connected indirectly by other devices or connection means to the second device.
Fig. 1 is the schematic diagram of the first exemplary embodiment of an alternating voltage adjustment circuit 100 of the invention.Alternating voltage tune
Whole circuit 100 is used to receive an AC-input voltage Vin, and is converted into an output voltage Vc for subsequent conditioning circuit use.
Alternating voltage adjustment circuit 100 includes 102, one divider 104 of a bridged rectifier circuit (bridgerectifier), a voltage
Holding circuit (voltage hold circuit) 106 and a switchable current source (switched current source)
108.Wherein bridged rectifier circuit 102 includes four diodes (being herein only illustrative purposes, and where the limitation of non-present invention),
For receiving AC-input voltage Vin to generate a bridge joint rectified signal Vbr, rectified signal Vbr is bridged through in divider 104
The pressure-dividing output voltage Vdiv with wave amplitude after adjustment can be exported after one first resistor R1 and second resistance R2 partial pressure, and
Pressure-dividing output voltage Vdiv can enter in voltage hold circuit 106.Voltage hold circuit 106 can be by an operational amplifier, one
Diode and a capacitor constitute (being herein only illustrative purposes, and where the limitation of non-present invention), are used to track and protect
The peak value of pressure-dividing output voltage Vdiv is held, and generates output voltage Vc accordingly.
It is possible to cause output voltage Vc instantaneously up inclined because of line voltage surging (spike) in actual circuit
It moves, in order to correct this error, is needed in traditional design quite big for the capacitor design one in voltage hold circuit 106
Numerical value, or in addition increase a discharge path a to ground voltage, wherein needing by the sizable resistance of a numerical value, this two
Kind of design very Expenses Cost for current processing procedure.According to the present embodiment, switchable current source 108 can initiatively provide one
Current path is between the output end and the ground voltage of voltage hold circuit 106, and the current path system is intermittently led
Logical, wherein switchable current source 108 includes the current source 1082 being set on the current path, a transistor 1084 and one
Control circuit 1086.Wherein current source 1082 can generate a constant current I, and transistor 1084 is used to as one in the present embodiment
Switching switch (i.e. one switch).Specifically, control circuit 1086 can be according to pressure-dividing output voltage Vdiv and a critical value
Vset1 generates a control signal cmp and is sent to a grid of transistor 1084, and in other words, control circuit 1086 utilizes
Whether controlling conducting of the signal cmp to control the current path, i.e., control circuit 1086 can be using control signal cmp come interval
Property control the current path conducting.However, the above are the preferred embodiment of the present invention, actually it is any can reach it is same or
The design of similar functions, and meet other variations of spirit of the invention, belong to the scope of the present invention.
Fig. 2 is the operation waveform diagram of the first embodiment of the control circuit 1086 in Fig. 1.As shown in Fig. 2, defeated whenever dividing
When voltage Vdiv passes through critical value Vset1 from the voltage higher than critical value Vset1 down out, the control signal of control circuit 1086
Cmp will be changed into a high level by a low value, and maintain a predetermined time T；That is, whenever pressure-dividing output voltage Vdiv from
When voltage higher than critical value Vset1 passes through critical value Vset1 down, control circuit 1086 will control current path conducting
Constant current I is allowed to discharge output voltage Vc well.It is so herein only illustrative purposes, and where the limitation of non-present invention, it is practical
On, any design that can reach same or like function, and meet other variations of spirit of the invention, belong to this
The range of invention.For example, Fig. 3 is the operation waveform diagram of the second embodiment of the control circuit 1086 in Fig. 1, in Fig. 3,
Reach a spy from the number that the voltage higher than critical value Vset1 passes through critical value Vset1 down whenever pressure-dividing output voltage Vdiv
When determining number, the control signal cmp of control circuit 1086 can be just changed into the high level by the low value, and maintain predetermined time T.It is huge
From the point of view of sight ground, it may be said that the current path has an average current constantly to correct the drift phenomenon of output voltage Vc.
In addition to this, also include a comparator 110 in alternating voltage adjustment circuit 100, be used to output voltage Vc and
One reference value Vset2 is compared, and exports a comparison result Vdet.In one embodiment, which can export ratio
For the pressure-dividing output voltage Vdiv of 100:1.For example, the divider can be defeated when AC-input voltage Vin is 130 volts ACs
The pressure-dividing output voltage Vdiv of about 1.3V out；When AC-input voltage Vin is 230 volts ACs, which can be exported about
The pressure-dividing output voltage Vdiv of 2.3V.Therefore, reference value Vset2 can be set as 2V in the present embodiment.Therefore when exchange input
When voltage Vin is 130 volts AC, comparison result Vdet=0；When AC-input voltage Vin is 230 volts AC, than
Compared with result Vdet=1.So, according to the present invention and the electronic product designed just does not need respectively for different regions electricity
Pressure produces different products, but can be integrated into together.
Fig. 4 is the one of light emitting diode (Light Emitting Diode, LED) brightness regulating circuit 400 of the invention
The schematic diagram of exemplary embodiment.Light-emitting diode luminance adjustment circuit 400 is used to control is powered by an AC-input voltage Vin
Multiple light-emitting diodes stack the respective magnitude of current of 402_1~402_N, wherein N can any positive integer.Each hair
It includes more than one light-emitting diode that optical diode element, which stacks 402_1~402_N,.Light-emitting diode luminance adjustment electricity
Road 400 includes aforementioned alternating voltage adjustment circuit 100 and multiple current control circuit 404_1~404_N, wherein alternating current
AC-input voltage Vin is converted to aforementioned bridge joint rectified signal Vbr, output voltage Vc and ratio respectively by pressure adjustment circuit 100
402_1~402_N is stacked supplied to multiple light-emitting diodes compared with result Vdet, and by bridge joint rectified signal Vbr, and
Output voltage Vc and comparison result Vdet are supplied to multiple current control circuit 404_1~404_N.Multiple current control circuits
404_1~404_N is respectively intended to the magnitude of current on current path belonging to control respectively, detail with reference Fig. 5.
Fig. 5 is the schematic diagram of an exemplary embodiment of current control circuit of the invention.Current control circuit 404_1 packet
Containing a mutual conductance (transconductance, transduction) amplifier 4042, for output voltage Vc is converted to a mutual conductance
(transconductance, transduction) electric current IGM.Mutual conductance electric current IGMFor controlling the affiliated electric current of current control circuit 404_1
The magnitude of current on path, and then control the magnitude of current (the i.e. LED current in Fig. 4 of light-emitting diode 402_1
ILED).The operating method of multiple current control circuit 404_2~404_N is similar to current control circuit 404_2, therefore herein just not
It repeats more.In one embodiment, mutual conductance electric current IGMIt is inversely proportional to output voltage Vc.Also that is, flowing through light-emitting diode
The magnitude of current of 402_1 is inversely proportional to the root-mean-square value of AC-input voltage Vin, as shown in the lower-left figure of Fig. 5.In another embodiment
In, mutual conductance electric current IGMIt is proportional to output voltage Vc.Also that is, the magnitude of current for flowing through light-emitting diode 402_1 is proportional to friendship
The root-mean-square value for flowing input voltage vin, as shown in the bottom-right graph of Fig. 5.
Fig. 6 is the schematic diagram of another exemplary embodiment of current control circuit of the invention.Current control circuit 404_1
It include one first trsanscondutance amplifier 4044, one second trsanscondutance amplifier 4046 and a selector 4048, wherein selector
4048 can come selectively according to comparison result Vdet by the first trsanscondutance amplifier 4044 or the second trsanscondutance amplifier 4046
Output electric current be coupled to corresponding light-emitting diode and stack, for example, (exchanged as comparison result Vdet=0
Input voltage vin is 110 volts ACs), presentation selector 4048 can be by the output electric current coupling of the first trsanscondutance amplifier 4044
Corresponding light-emitting diode is connected to stack；Conversely, (AC-input voltage Vin is 230 as comparison result Vdet=1
Volts AC), the output electric current of the second trsanscondutance amplifier 4046 can be coupled to corresponding luminous two by presentation selector 4048
Pole pipe element stacks.In the present embodiment, the first trsanscondutance amplifier 4044 and the second trsanscondutance amplifier 4046 are by output voltage Vc
It is respectively converted into one first mutual conductance electric current IGM1 and one second mutual conductance electric current IGM2, and determine to take out according to comparison result Vdet
Take the first mutual conductance electric current IGM1Or the second mutual conductance electric current IGM2, to generate a LED current ILEDTo control current control
The magnitude of current on the affiliated current path of circuit 404_1, and then the magnitude of current of light-emitting diode 402_1 is controlled (i.e. in Fig. 4
LED current ILED).The transconductance value of first trsanscondutance amplifier 4044 and the second trsanscondutance amplifier 4046 can be set as not
With value, to increase the elasticity of design.Current control electricity is similar to as the operating method of current control circuit 404_2~404_N
Road 404_1, therefore just do not repeat herein.
Referring to FIG. 7, root-mean-square value and LED current ILED that Fig. 7 is AC-input voltage Vin are comparing knot
Fruit Vdet=0(, that is, AC-input voltage Vin is 110 volts ACs) when a graph of relation.It note that the relationship in Fig. 7
Curve graph be to compensate for causing because of the variation of AC-input voltage Vin multiple light-emitting diodes stack 402_1~
402_N brightness is followed the phenomenon that changing and is especially reversely pushed out.In other words, the first mutual conductance electric current I in Fig. 7GM1It can be inversely proportional to
The root-mean-square value of AC-input voltage Vin.In addition, Fig. 8 is the root-mean-square value and LED current of AC-input voltage Vin
ILED230 volts ACs in comparison result Vdet=1(, that is, AC-input voltage Vin) when graph of relation.Reference Fig. 8,
Second mutual conductance electric current IGM2Also the root-mean-square value of AC-input voltage Vin, and the transconductance value of the second trsanscondutance amplifier 4046 are inversely proportional to
For the half of the transconductance value of the first trsanscondutance amplifier 4044.It should be noted that the numerical value in Fig. 7 and Fig. 8 is only illustrative purposes, and
Non- limitation of the present invention, in fact, any variation that can reach same or like function, and meet invention essence of the invention
Other variations of mind, belong to the scope of the present invention.
In summary, alternating voltage adjustment circuit of the invention avoids electric leakage from causing output voltage using novel method
It ad infinitum up deviates, save the cost in design and improves accuracy, it additionally being capable of the different exchange of automatic discrimination
Voltage (such as 120 volts ACs and 230 volts ACs).In addition to this, light-emitting diode luminance of the invention adjusts electricity
Road can use above-mentioned alternating voltage adjustment circuit to solve the brightness for the light-emitting diode powered by AC-input voltage
Stable problem.
The above description is only a preferred embodiment of the present invention, all equivalent changes made according to the claims of the present invention with repair
Decorations, are all covered by the present invention.
Claims (6)
1. a kind of light-emitting diode luminance adjustment circuit, for controlling the light emitting diode member by AC-input voltage power supply
The magnitude of current of part includes:
Alternating voltage adjustment circuit receives an AC-input voltage, keeps for generating the voltage according to the AC-input voltage
Signal；Wherein, which includes:
One bridged rectifier circuit, for receiving the AC-input voltage to generate a bridge joint rectified signal；
One voltage hold circuit is coupled to the bridged rectifier circuit, keeps signal for generating a voltage；
One switchable current source, for providing a current path between the output end and a reference voltage of the voltage hold circuit,
Wherein the switchable current source compares the bridge joint rectified signal and a critical value the current path is intermittently connected；Wherein, should
Bridge joint rectified signal reflects the amplitude of the AC-input voltage immediately, and
One comparator is coupled to the voltage hold circuit, keeps signal and a reference value for comparing the voltage, and export a ratio
Relatively result；And
One current control circuit, is coupled to the alternating voltage adjustment circuit, and according to the voltage keep signal and this compare
As a result the magnitude of current of the light-emitting diode is controlled.
2. light-emitting diode luminance adjustment circuit as described in claim 1, wherein the current control circuit includes:
One first trsanscondutance amplifier, for voltage holding signal is converted to one first mutual conductance electric current；
One second trsanscondutance amplifier, for voltage holding signal is converted to one second mutual conductance electric current；And
One selector is coupled to the light-emitting diode, for carrying out selecting extraction first mutual conductance electricity according to the comparison result
Stream or the second mutual conductance electric current, to control the magnitude of current of the light-emitting diode.
3. alternating voltage adjustment circuit as described in claim 1 also includes a divider, be coupled to the bridged rectifier circuit with
And between the voltage hold circuit.
4. alternating voltage adjustment circuit as described in claim 1, wherein the switchable current source includes:
One current source is set on the current path；
One switching switch, is set on the current path；And
One control circuit is coupled to switching switch, for opening or closing switching switch, wherein when the switching is opened
Qi Shi, the current path can be switched on.
5. alternating voltage adjustment circuit as claimed in claim 4, wherein only when the bridge joint rectified signal is more than the critical value,
The control circuit can just open the switching and switch and maintain a predetermined time.
6. alternating voltage adjustment circuit as claimed in claim 4, wherein the bridge joint rectified signal is often more than that the critical value reaches
When one specific times, which can just open the switching and switch and maintain a predetermined time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410083409.4A CN104902611B (en) | 2014-03-07 | 2014-03-07 | Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410083409.4A CN104902611B (en) | 2014-03-07 | 2014-03-07 | Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit |
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| Publication Number | Publication Date |
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| CN104902611A CN104902611A (en) | 2015-09-09 |
| CN104902611B true CN104902611B (en) | 2018-12-07 |
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| CN201410083409.4A Active CN104902611B (en) | 2014-03-07 | 2014-03-07 | Alternating voltage adjustment circuit and light-emitting diode luminance adjustment circuit |
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| CN110035572B (en) * | 2018-01-11 | 2021-06-29 | 晶豪科技股份有限公司 | Controller for switching regulator, switching regulator and LED lighting system |
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| CN102143639A (en) * | 2011-04-18 | 2011-08-03 | 鸿富锦精密工业（深圳）有限公司 | LED (Light Emitting Diode) driving circuit |
| CN102710125A (en) * | 2011-03-28 | 2012-10-03 | 东芝照明技术株式会社 | Switching power supply device and lighting apparatus |
| CN102870498A (en) * | 2010-04-30 | 2013-01-09 | 皇家飞利浦电子股份有限公司 | Dimming regulator including programmable hysteretic down-converter for increasing dimming resolution of solid state lighting loads |
| CN103532378A (en) * | 2012-07-05 | 2014-01-22 | 晶豪科技股份有限公司 | Voltage converter capable of suppressing output voltage overshooting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010027817A2 (en) * | 2008-08-25 | 2010-03-11 | Maxim Integrated Products, Inc. | Power factor correction in and dimming of solid state lighting devices |
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- 2014-03-07 CN CN201410083409.4A patent/CN104902611B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102870498A (en) * | 2010-04-30 | 2013-01-09 | 皇家飞利浦电子股份有限公司 | Dimming regulator including programmable hysteretic down-converter for increasing dimming resolution of solid state lighting loads |
| CN102710125A (en) * | 2011-03-28 | 2012-10-03 | 东芝照明技术株式会社 | Switching power supply device and lighting apparatus |
| CN102143639A (en) * | 2011-04-18 | 2011-08-03 | 鸿富锦精密工业（深圳）有限公司 | LED (Light Emitting Diode) driving circuit |
| CN103532378A (en) * | 2012-07-05 | 2014-01-22 | 晶豪科技股份有限公司 | Voltage converter capable of suppressing output voltage overshooting |
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