CN104902609B - A kind of control circuit of piece-wise linear constant-current drive circuit firm power - Google Patents
A kind of control circuit of piece-wise linear constant-current drive circuit firm power Download PDFInfo
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- CN104902609B CN104902609B CN201410076428.4A CN201410076428A CN104902609B CN 104902609 B CN104902609 B CN 104902609B CN 201410076428 A CN201410076428 A CN 201410076428A CN 104902609 B CN104902609 B CN 104902609B
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Abstract
The embodiment of the invention discloses a kind of control circuits of piece-wise linear constant-current drive circuit firm power, including rectifier bridge (101), input sampling circuit (102), first internal reference voltage generator (103), duty ratio wave generator circuit (104), phase inverter (105), modulation circuit (106), ratio and low-frequency filter circuit (107), and the second internal reference voltage generator (108), the circuit of sampling input (102), for taking resistance pressure-dividing network, so that sampled voltage is reduced to controller acceptable low-voltage, take peak-value detection method synchronous with input voltage waveform to detect peak value simultaneously；The ratio and low-frequency filter circuit (107), for adjusting ratio, to export the DC reference voltage being negatively correlated with input voltage peak value.The present invention is used to the corresponding electric current of Negative correlation is generated, to achieve the purpose that constant output in the case where input voltage variation.
Description
Technical field
The invention belongs to power drives technical field, a kind of particularly constant function of piece-wise linear constant-current drive circuit
The control circuit of rate.
Background technique
Constant current adjust Light-emitting diode LED driving circuit in, exist due to the fluctuation of network voltage cause it is defeated
The situation of change of power out.
To piece-wise linear constant-current circuit as shown in Figure 1, the electric current for flowing through LED string takes the controlling party of segmented
Formula, every section of electric current can be configured respectively and current constant control, the current sampling unit and electricity being independently arranged by every section of LED string
It presses sampling unit to carry out the sampling of electric current and voltage, and every section of LED is controlled by total controller and reference voltage generator
Constant current state, the current waveform of segmented is as shown in Figure 2.As shown in figure 3, bold portion sine curve is that input voltage is
The waveform of voltage when 220V, the waveform of staircase waveform is input voltage when being 220V electric current；In dotted portion curve, sine curve
Be 220V*(1+10% for input voltage) when voltage waveform, staircase waveform show input voltage be 220V*(1+10%) when
Electric current waveform.After input voltage increases 10% from 220V, the current value of former four ladders, due to taking current constant control
Method, and keep initial value constant.But since voltage rises, the turn-on time for being segmented LED is elongated.The power of LED consumption is ladder
Area below formula curve is multiplied by forward voltage values.I.e.
Herein,
At the beginning of ts1 is first grading current；
At the beginning of ts2 is first grading current；
At the beginning of ts3 is third grading current；
At the beginning of ts4 is the 4th grading current；
Ts5 is the midpoint times of the 4th grading current；
For forward voltage values of the first segment LED in constant current operation；
For forward voltage values of the second segment LED in constant current operation；
For forward voltage values of the third section LED in constant current operation；
For the 4th section of forward voltage values of the LED in constant current operation；
For current value of the first segment LED in constant current operation；
For current value of the first segment LED in constant current operation；
For current value of the first segment LED in constant current operation；
For current value of the first segment LED in constant current operation.
Compared with bold portion, dotted portion area is increased, and deviates from the output work designed in normal input voltage
Rate.Actual test shows that input power increases 15% after input voltage increases by 10%.In the increased situation of input voltage,
The consumption power ratio design value of LED string is higher, and the power consumption that LED may be made to bear is excessively high, insufficient in radiating management surplus
In the case of, entire lamp temperatures may be made to increase, exacerbate the light decay of LED lamp.In the case where input voltage reduces, LED
The consumption power ratio design value of lamp bead is relatively low, makes the reduction of LED lamp light emission luminance.
Therefore for drawbacks described above present in currently available technology, it is really necessary to be studied, to provide a kind of scheme,
Defect existing in the prior art is solved, is avoided in the case where input voltage fluctuation, the power of LED lamp is unstable
Problem.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of piece-wise linear constant-current drive circuit firm powers
Control circuit can reduce the average current for flowing through LED string, in input voltage in the raised situation of input voltage
In the case where reduction, the average current for flowing through LED string can be increased, to achieve the purpose that constant output.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of control circuit of piece-wise linear constant-current drive circuit firm power, including rectifier bridge, input sampling circuit,
First internal reference voltage generator, duty ratio wave generator circuit, phase inverter, modulation circuit, ratio and low-frequency filter circuit,
And the second internal reference voltage generator,
The rectifier bridge, for generating full sinusoidal wave waveform after rectifying AC-input voltage,
The circuit of sampling input, for taking resistance pressure-dividing network, so that sampled voltage is reduced to controller and can connect
The low-voltage received, while taking peak-value detection method synchronous with input voltage waveform to detect peak value；
The first internal reference voltage generator, for generating sawtooth wave；
The duty ratio wave generator circuit, for by sawtooth signal compared with the input voltage peak signal of sampling,
Generate pulse-width signal；
The phase inverter, for generating the arteries and veins being negatively correlated with input voltage peak value for the pulse-width signal reverse phase
Wide modulated signal；
The modulation circuit, the second internal reference voltage for generating the second internal reference voltage generator with it is defeated
It is input to ratio and low-frequency filter circuit after entering the pulse-width signal modulation that voltage peak is negatively correlated,
The ratio and low-frequency filter circuit, for adjusting ratio, with export be negatively correlated with input voltage peak value it is straight
Flow reference voltage.
Preferably, it is 10-100KHz that the first internal reference voltage generator, which generates the frequency of sawtooth wave,.
Compared with prior art, beneficial effects of the present invention are as follows: in the raised situation of input voltage, can reduce stream
The average current gone here and there through LED can increase the average current for flowing through LED string, to reach in the case where input voltage reduces
The purpose of constant output, circuit structure are simple.
Detailed description of the invention
Fig. 1 is the structure principle chart of piece-wise linear constant current LED drive circuit in the prior art；
Fig. 2 is the current waveform figure of piece-wise linear constant current LED drive circuit in the prior art；
Current wave deformation when Fig. 3 is the input voltage variation of piece-wise linear constant current LED drive circuit in the prior art
Change figure；
Fig. 4 is the structural frames of the control circuit of the piece-wise linear constant-current drive circuit firm power of the embodiment of the present invention
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
In piece-wise linear constant-current drive circuit, the electric current and reference voltage base correlation of LED string are flowed through,
I.e.
Wherein,For the value of each grading current；For proportionality coefficient, the i.e. inverse of sampling resistor；For inside
Reference voltage base.
It can be found by above formula, consume power in order to compensate for the LED changed with input voltage, thus it is possible to vary internal,
It is allowed to be negatively correlated relationship with input voltage peak value.I.e.
For internal reference voltage adjusted；For proportionality coefficient；For input ac voltage peak
Value；To the power consumed on LED are as follows:
HereinFor compensated each grading current value, proportionality coefficient is adjusted, can achieve firm power
Control purpose.
Therefore, illustrated by above-mentioned principle, referring to fig. 4, show the piece-wise linear constant current driving of the embodiment of the present invention
The structural block diagram of the control circuit of circuit firm power comprising rectifier bridge 101, input sampling circuit 102, the first internal reference
Voltage generator 103, duty ratio wave generator circuit 104, phase inverter 105, modulation circuit 106, ratio and low-frequency filter circuit
107 and the second internal reference voltage generator 108, wherein rectifier bridge 101 after rectifying AC-input voltage for generating
Full sinusoidal wave waveform；Circuit of sampling input 102 for taking resistance pressure-dividing network so that sampled voltage be reduced to controller can be with
The low-voltage of receiving, while taking peak-value detection method synchronous with input voltage waveform to detect peak value；First internal reference electricity
Pressure generator 103 is for generating sawtooth wave；Duty ratio wave generator circuit 104 is used for the input of sawtooth signal and sampling electricity
Voltage crest value signal compares, and generates pulse-width signal, i.e., when input voltage is higher than standard value, the high level ratio of output becomes
Height, when input voltage is lower than standard value, the high level ratio of output is lower；Phase inverter 105 is for believing the pulsewidth modulation
Number reverse phase generates the pulse-width signal being negatively correlated with input voltage peak value；Modulation circuit 106 is used for the second internal reference
The second internal reference voltage that voltage generator 108 generates is modulated with the pulse-width signal being negatively correlated with input voltage peak value
After be input to ratio and low-frequency filter circuit 107；Ratio and low-frequency filter circuit 107 are for adjusting ratio, to export and input
The DC reference voltage that voltage peak is negatively correlated.The DC reference voltage being negatively correlated with input voltage peak value can then input
It into reference voltage module shown in FIG. 1, is realized in the raised situation of input voltage with this, can reduce and flow through LED string
Average current can increase the average current for flowing through LED string, to reach constant output in the case where input voltage reduces
The purpose of power.
Specifically should be in example, the frequency that the first internal reference voltage generator generates sawtooth wave be 10-100KHz, with
Subsequent low frequency filtering unit is facilitated to can choose the lesser capacitor of capacitance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. a kind of control circuit of piece-wise linear constant-current drive circuit firm power, which is characterized in that including rectifier bridge
(101), input sampling circuit (102), the first internal reference voltage generator (103), duty ratio wave generator circuit (104),
Phase inverter (105), modulation circuit (106), ratio and low-frequency filter circuit (107) and the second internal reference voltage generator
(108),
The rectifier bridge (101), for generating full sinusoidal wave waveform after rectifying AC-input voltage,
The circuit of sampling input (102), for taking resistance pressure-dividing network, so that sampled voltage is reduced to controller and can connect
The low-voltage received, while taking peak-value detection method synchronous with input voltage waveform to detect peak value；
The first internal reference voltage generator (103), for generating sawtooth wave；
The duty ratio wave generator circuit (104), for by sawtooth signal compared with the input voltage peak signal of sampling,
Generate pulse-width signal；
The phase inverter (105), for generating the arteries and veins being negatively correlated with input voltage peak value for the pulse-width signal reverse phase
Wide modulated signal；
The modulation circuit (106), the second internal reference voltage for generating the second internal reference voltage generator (108)
It is input to ratio and low-frequency filter circuit (107) after modulating with the pulse-width signal being negatively correlated with input voltage peak value,
The ratio and low-frequency filter circuit (107), for adjusting ratio, with export be negatively correlated with input voltage peak value it is straight
Flow reference voltage, the voltage of output are as follows:
Vref-Adj=K2×Vref/Vp-ac
Vref-AdjFor DC reference voltage adjusted；K2For proportionality coefficient；Vp-acFor input voltage peak value, VrefFor internal reference
Voltage reference.
2. the control circuit of piece-wise linear constant-current drive circuit firm power according to claim 1, which is characterized in that
The frequency that first internal reference voltage generator generates sawtooth wave is 10-100KHz.
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| CN106455227B (en) * | 2016-11-11 | 2019-02-01 | 深圳市明微电子股份有限公司 | A kind of LED linear constant-current control circuit and LED light emission device |
| CN108347801B (en) * | 2017-01-24 | 2019-12-17 | 华润矽威科技（上海）有限公司 | full-voltage input single-section linear LED driving circuit and driving method thereof |
| CN109392213A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of low-voltage output linear constant current LED driving method |
| US11415623B2 (en) * | 2019-03-28 | 2022-08-16 | Teradyne, Inc. | Test system supporting reverse compliance |
| CN112636399B (en) * | 2019-09-24 | 2023-08-04 | 北京小米移动软件有限公司 | Charging method and device, terminal equipment and storage medium |
| CN113270997A (en) * | 2021-06-07 | 2021-08-17 | 浙江精英电器有限公司 | Progressive control method and control circuit for surge steps of inverter |
| CN113630933B (en) * | 2021-09-18 | 2024-02-27 | 上海三思电子工程有限公司 | LED driver, driving circuit and driving method |
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| CN201509346U (en) * | 2009-10-23 | 2010-06-16 | 亚源科技股份有限公司 | LED power supply device capable of fixing maximum and minimum brightness |
| CN201758477U (en) * | 2010-08-27 | 2011-03-09 | 奥斯兰姆有限公司 | Light-adjusting control circuit for pulse width modulation (PWM) light adjustment and light-emitting unit driving device |
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