CN104640268B - A kind of High-power-factor constant current control circuit and LED illumination device - Google Patents
A kind of High-power-factor constant current control circuit and LED illumination device Download PDFInfo
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- CN104640268B CN104640268B CN201310552793.3A CN201310552793A CN104640268B CN 104640268 B CN104640268 B CN 104640268B CN 201310552793 A CN201310552793 A CN 201310552793A CN 104640268 B CN104640268 B CN 104640268B
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Abstract
The invention belongs to LED illumination actuation techniques field, a kind of High-power-factor constant current control circuit and LED illumination device are provided.The High-power-factor constant current control circuit is on the basis of existing High-power-factor constant current control circuit, increase by a constant-current source circuit in constant-current driven chip, error amplifying circuit in constant-current driven chip is sampled by the voltage of the first end to the constant-current source circuit, sampling voltage is compared with a reference voltage, the two is amplified by error, it is output to turn-on time control circuit, then pass through the on-off of control switch circuit, adjust the input voltage of constant-current source circuit, make constant-current source circuit work in normal constant current state, so that LED load passes through constant current, to eliminate influence of the ripple to LED load, and then eliminate stroboscopic phenomenon, human eye health can be protected, promote user experience.
Description
Technical field
The invention belongs to LED illumination actuation techniques field more particularly to a kind of High-power-factor constant current control circuit and LED
Lighting apparatus.
Background technique
Obtaining alternating current and rectified rear power for load equipment from power grid is a kind of common drive scheme.If but accessing
The power factor of the load equipment of AC network is relatively low, then a degree of harmonic pollution can be caused to utility network.
It is existing in order to meet High Power Factor requirement while meeting constant current driving in LED illumination actuation techniques field
There is technology to propose a kind of constant-current driven chip by constant-current control circuit and is internally integrated active power factor correction and perseverance
Output function is flowed, it is existing as shown in figure 1 to be realized using this kind of mode to realize the implementation of high power factor constant current driving
The structure of the constant-current control circuit of high power factor constant current driving.
Wherein, whether switching circuit is used to control output of the rectifier circuit to LED load by off operating mode, pulse letter
Number generative circuit is used to generate the modulated signal of control switch connecting and disconnecting of the circuit state, and error amplifying circuit is used for switching circuit is defeated
After the voltage of outlet and the voltage of reference voltage source carry out error amplification, turn-on time control circuit, turn-on time control are given in output
Circuit processed is used for when the turn-on time of switching circuit reaches first time preset value, is exported and is turned off to pulse signal generative circuit
Signal is controlled, turn-off time control circuit is used to generate electricity to pulse signal when the turn-off time of switching circuit reaching preset value
Road exports opening control signal.In the circuit, the average value due to flowing through switching circuit is the electricity of one with rectifier circuit output
The instantaneous value of pressure differs the same frequency in-phase signal of a fixed amount, to realize High Power Factor.
But in circuit shown in FIG. 1, in actual circuit, the output of rectifier circuit is with same with two frequencys multiplication of alternating current
The half-sinusoid signal of frequency is directly output to LED load after switching circuit, therefore LED load can exist and alternating current
The stroboscopic of two frequency multiplication same frequencys, damages the health of human eye, and user experience is poor.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of High-power-factor constant current control circuit, it is intended to which solution is currently used for
The High-power-factor constant current control circuit of driving LED load makes LED load generate stroboscopic, damages the health of human eye, user's body
The problem of the property tested difference.
The embodiments of the present invention are implemented as follows, a kind of High-power-factor constant current control circuit, including rectifier circuit and
Constant-current driven chip, the constant-current driven chip include:
Switching circuit, whether for controlling output of the rectifier circuit to LED load by off operating mode；
Pulse signal generative circuit, for generating the modulated signal for controlling the on off operating mode of the switching circuit；
Turn-on time control circuit, for when the turn-on time of the switching circuit reaches first time preset value, to
The pulse signal generative circuit output shutdown control signal, to control the switching circuit shutdown；
Turn-off time control circuit, for exporting opening control signal to the pulse signal generative circuit, to control
State switching circuit conducting；
Constant-current source circuit, in the voltage change of the first end of constant-current source circuit, generating constant output electric current, with
So that the LED load passes through constant current；
Error amplifying circuit, the voltage for the first end to constant-current source circuit are sampled, and by sampling voltage and the
Output is to the turn-on time control circuit after the voltage of three reference voltage sources carries out error amplification.
The another object of the embodiment of the present invention is to provide a kind of LED illumination device, including described in LED load and connection
The High-power-factor constant current control circuit of LED load, the High-power-factor constant current control circuit are high powers as described above
Factor constant current control circuit.
The High-power-factor constant current control circuit that the embodiment of the present invention proposes is to control electricity in existing high power factor constant current
On the basis of road, increase by a constant-current source circuit in constant-current driven chip, the error amplifying circuit in constant-current driven chip by pair
The first end voltage of the constant-current source circuit is sampled, and sampling voltage is compared with a reference voltage, and the two passes through error
Amplification, is output to turn-on time control circuit, then passes through the on-off of control switch circuit, adjusts the input electricity of constant-current source circuit
Pressure makes constant-current source circuit work in normal constant current state, so that LED load passes through constant current, to eliminate ripple
Influence to LED load, and then stroboscopic phenomenon is eliminated, human eye health can be protected, user experience is promoted.
Detailed description of the invention
Fig. 1 is the structure chart for the High-power-factor constant current control circuit that the prior art provides；
Fig. 2 is the structure chart for the High-power-factor constant current control circuit that first embodiment of the invention provides；
Fig. 3 is the circuit diagram of Fig. 2；
Fig. 4 is the structure chart for the High-power-factor constant current control circuit that second embodiment of the invention provides；
Fig. 5 is the circuit diagram of Fig. 4；
Fig. 6 is the structure chart for the High-power-factor constant current control circuit that third embodiment of the invention provides；
Fig. 7 is the structure chart for the High-power-factor constant current control circuit that fourth embodiment of the invention provides.
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.
In view of the problems of the existing technology, the invention proposes a kind of High-power-factor constant current control circuit, the circuits
It is to increase by a constant-current source circuit in constant-current driven chip on the basis of existing High-power-factor constant current control circuit, constant current is driven
Error amplifying circuit in dynamic chip is sampled by first end (or input terminal) voltage to the constant-current source circuit, will be taken
Sample voltage is compared with a reference voltage, and the two is amplified by error, is output to turn-on time control circuit, is then passed through control
The on-off of switching circuit processed adjusts the first end voltage of constant-current source circuit, and constant-current source circuit is made to work in normal constant current state,
So that LED load passes through constant current.
Fig. 2 shows first embodiment of the invention provide High-power-factor constant current control circuit structure, for the ease of
Illustrate, illustrates only part relevant to first embodiment of the invention.
Specifically, the High-power-factor constant current control circuit include electric main Vac is rectified and is exported it is whole
Flow bridge circuit 2, constant-current driven chip 1, first capacitor C1, the second capacitor C2, first diode D1, inductance L1.
Wherein, constant-current driven chip 1 includes: switching circuit 11, the input terminal connection rectifier circuit 2 of switching circuit 11
Output end, the first end of the output end connection first capacitor C1 of switching circuit 11 and the cathode of first diode D1, the one or two
The plus earth of pole pipe D1；The pulse signal generative circuit 12 of connection switch circuit 11；The output end of connection switch circuit 11
Error amplifying circuit 13；The turn-on time control circuit 14 of pulse signal generative circuit 12 and error amplifying circuit 13 is connected, and
The first end of second capacitor C2 and the output end of the input terminal of turn-on time control circuit 14 and error amplifying circuit 13 connect altogether, the
The second end of two capacitor C2 connects equipotential signal ground SGND；Connect the turn-off time control circuit of pulse signal generative circuit 12
15。
It is of the existing technology in order to solve the problems, such as, it is different from shown in Fig. 1, in first embodiment of the invention, constant current driving
Chip 1 further include: constant-current source circuit 16.At this point, the output end of the first end connection switch circuit 11 of constant-current source circuit 16, constant current
The first end of the second end connection LED load of source circuit 16, the second end of the second end connection first capacitor C1 of LED load, LED
The second end of load also passes through inductance L1 and is grounded.Meanwhile pulse signal generative circuit 12, error amplifying circuit 13, turn-on time
Control circuit 14, turn-off time control circuit 15, constant-current source circuit 16, LED load first end connect equipotential signal ground
SGND；Pulse signal generative circuit 12, error amplifying circuit 13, turn-on time control circuit 14, turn-off time control circuit 15,
The power end of constant-current source circuit 16 connects direct current VCC jointly.
In first embodiment of the invention, switching circuit 11 is used to control rectifier circuit 2 to load by off operating mode
Whether output, when switching circuit 11 is in the conductive state, rectifier circuit 2 exports electric energy to load, while inductance L1 is stored
Energy, when switching circuit 11 is in an off state, rectifier circuit 2 does not export electric energy to LED load, and inductance L1 is to LED load
It releases energy；Pulse signal generative circuit 12 is used to generate the modulated signal of 11 on off operating mode of control switch circuit；Error amplification
Circuit 13 is used to be sampled the voltage of the first end (also referred to as input terminal) of constant-current source circuit 16, and by sampling voltage and third
After the voltage of reference voltage source carries out error amplification, export to turn-on time control circuit 14；Turn-on time control circuit 14 is used
In generating relatively-stationary turn-on time, that is, first time preset value according to the output of error amplifying circuit 13, and work as switching circuit
When 11 turn-on time reaches first time preset value, shutdown control signal is exported to pulse signal generative circuit 12, with control
Switching circuit 11 turns off；Turn-off time control circuit 15 is used to reach the second time preset value when the turn-off time of switching circuit 11
When, opening control signal is exported to pulse signal generative circuit 12, with the conducting of control switch circuit 11；Constant-current source circuit 16 is used for
In the voltage change of its first end, constant output electric current is generated, so that LED load passes through constant current.
Illustrate that the above-mentioned High-power-factor constant current control circuit that first embodiment of the invention provides realizes constant current driving below
Principle: from Figure 2 it can be seen that the size of current for flowing through LED load is equal with the size of current for flowing through constant-current source circuit 16, direction phase
Together, therefore only it need to guarantee 16 output constant current of constant-current source circuit.If according to the working principle of constant-current source it is found that constant-current source just
Normal work, can constant current output.
Illustrate below first embodiment of the invention provide above-mentioned High-power-factor constant current control circuit realize high power because
Several principle: as shown in Fig. 2, error amplifying circuit 13 and the second capacitor C2 constitute an average current ring, due to average current ring
With switch periods average value filtering effect, therefore, the negative terminal input signal of error amplifying circuit 13, also as constant-current source circuit
The input voltage of 16 first end voltage, constant-current source circuit 16 is compared with the voltage of third reference voltage source, therebetween
Error averaged electric current loop amplification after, average current ring output (being also the output of error amplifying circuit 13) is a superposition
The low-frequency ripple of twice AC network frequency and the DC level of high frequency switching ripple.Turn-on time control circuit 14 is according to average
The DC level of electric current loop output modulates a corresponding turn-on time Ton as first time preset value, works as switching circuit
When 11 conducting duration reaches Ton, turn-on time control circuit 14 generates a shutdown control signal and turns off switching circuit 11, it
The the second time preset value set afterwards according to turn-off time control circuit 15 generates an opening control signal to open switching circuit
11, repeatedly, form the on-off that a switch modulation signal carrys out control switch circuit 11.By setting the second time preset value
Toff is fixed value, selects suitable inductance L1, so that system work is under discontinuous operating mode, it is assumed that rectifier circuit 2 is defeated
The instantaneous value of voltage out is Uin (t), and for sinusoidal half-wave signa, output voltage Vout, each switch periods flow through inductance
The peak point current of L1 is Ip (t), is had according to the volt-second characteristic of discontinuous operating mode:
(Uin (t)-Vout) × Ton=L1 × Ip (t) (3)
Assuming to flow through the average value of the electric current of switching circuit 11 in each switch periods again is Im (t), duty ratio D,
Switch periods are T, then under discontinuous mode, input the size of average current are as follows:
Im (t)=1/2 × Ip (t) × D=1/2 × Ip (t) × Ton/T(4)
Known to convolution (3) and formula (4):
Im (t)=1/2 × Ip (t) × D=1/2 × (Ton × Ton/L1/T) × (Uin (t)-Vout) (5)
By formula (5) it is found that since Ton, T and L1 are fixed amounts, flow through switching circuit 11 average value be one with
Uin (t) differs the same frequency in-phase signal of a fixed amount, to realize High Power Factor.
Fig. 3 shows the circuit of Fig. 2.
Specifically, switching circuit 11 may include: the drain electrode of the first metal-oxide-semiconductor Q1, the first metal-oxide-semiconductor Q1 of N-type as switch
The input terminal of circuit 11, output end of the source electrode of the first metal-oxide-semiconductor Q1 as switching circuit 11, the grid connection of the first metal-oxide-semiconductor Q1
Pulse signal generative circuit 12.
Specifically, pulse signal generative circuit 12 may include: the 5th metal-oxide-semiconductor Q5 of N-type, N-type the 6th metal-oxide-semiconductor Q6,
First phase inverter U7, rest-set flip-flop U6.Wherein, the drain electrode of the 5th metal-oxide-semiconductor Q5 connects direct current VCC, the source electrode of the 5th metal-oxide-semiconductor Q5
The drain electrode of the 6th metal-oxide-semiconductor Q6 and connection switch circuit 11 are connected, the source electrode of the 6th metal-oxide-semiconductor Q6 meets equipotential signal ground SGND；The
The grid of six metal-oxide-semiconductor Q6 connects the output end of the first phase inverter U7, and the input terminal of the first phase inverter U7 connects the 5th metal-oxide-semiconductor Q5's
Grid, and connect the same-phase output pin Q of rest-set flip-flop U6；The same-phase output pin Q of rest-set flip-flop U6 connects pass simultaneously
Disconnected time control circuit 15 and turn-on time control circuit 14；The S pin of rest-set flip-flop U6 connects turn-off time control circuit 15；
The R pin of rest-set flip-flop U6 connects turn-on time control circuit 14.
Specifically, error amplifying circuit 13 may include: first error amplifier U3 and third reference voltage source 131.Its
In, third reference voltage source 131 connects the positive input terminal of first error amplifier U3, the negative input end of first error amplifier U3
Connect the first end of first capacitor C1, the output end connection turn-on time control circuit of first error amplifier U3 and the second capacitor
The first end of C2.
Specifically, turn-on time control circuit 14 may include: first comparator U5, the first current source A1, the second reverse phase
Device U4, the 4th metal-oxide-semiconductor Q4 of N-type, the third metal-oxide-semiconductor Q3 of p-type, third capacitor C3.Wherein, the input terminal of the second phase inverter U4 connects
Pulse signal generative circuit 12 is connect, the same-phase output pin of rest-set flip-flop U6 specifically in connection pulse signal generative circuit 12
The output end of Q, the second phase inverter U4 connect the grid of the 4th metal-oxide-semiconductor Q4；The of the source electrode of 4th metal-oxide-semiconductor Q4 and third capacitor C3
One end connects equipotential signal ground, the second end of the drain electrode connection third capacitor C3 of the 4th metal-oxide-semiconductor Q4, first comparator U5 jointly
Negative input end and third metal-oxide-semiconductor Q3 drain electrode, the source electrode of third metal-oxide-semiconductor Q3 connects the output end of the first current source A1；First
The positive input terminal of comparator U5 connects error amplifying circuit 13, and the output end of first comparator U5 connects pulse signal generative circuit
12, specifically connect the R pin of rest-set flip-flop U6.
Specifically, turn-off time control circuit 15 may include: the second comparator U2, the second reference voltage source 151, second
Current source A2, the 8th metal-oxide-semiconductor Q8 of N-type, p-type the 7th metal-oxide-semiconductor Q7, the 4th capacitor C4.Wherein, the grid of the 8th metal-oxide-semiconductor Q8
Pulse signal generative circuit 12 is connected, specifically the same-phase output of rest-set flip-flop U6 is drawn in connection pulse signal generative circuit 12
The source electrode of foot Q, the 8th metal-oxide-semiconductor Q8 connect equipotential signal ground SGND, the 8th metal-oxide-semiconductor Q8 with the first end of the 4th capacitor C4 jointly
The drain electrode connection second end of the 4th capacitor C4, the second comparator U2 negative input end and the 7th metal-oxide-semiconductor Q7 drain electrode；7th
The source electrode of metal-oxide-semiconductor Q7 connects the output end of the second current source A2, and the grid of the 7th metal-oxide-semiconductor Q7 connects the grid of the 8th metal-oxide-semiconductor Q8；
The positive input terminal of second comparator U2 connects the second reference voltage source 151, and the output end of the second comparator U2 connects pulse signal
Generative circuit 12 specifically connects the S pin of rest-set flip-flop U6.
Specifically, constant-current source circuit 16 may include: the first reference voltage source 161, the second error amplifier U1, N-type
Second metal-oxide-semiconductor Q2, first resistor R1.Wherein, the positive input terminal of the second error amplifier U1 connects the first reference voltage source 161,
The negative input end of second error amplifier U1 connects the source electrode of the second metal-oxide-semiconductor Q2, and the source electrode of the second metal-oxide-semiconductor Q2 connects first resistor
The first end of R1, second end of the second end of first resistor R1 as constant-current source circuit 16, the drain electrode of the second metal-oxide-semiconductor Q2 is as permanent
The first end of current source circuit 16, the grid of the second metal-oxide-semiconductor Q2 connect the output end of the second error amplifier U1.
The working principle of circuit shown in Fig. 3 described further below:
Firstly, when the same-phase output pin Q output of rest-set flip-flop U6 is high level, the first metal-oxide-semiconductor Q1 conducting, RS touching
It is low electricity that the high level of the same-phase output pin Q output of hair device U6, which feeds back to the second phase inverter U4, the second phase inverter U4 output,
Flat, so that third metal-oxide-semiconductor Q3 is connected and the 4th metal-oxide-semiconductor Q4 cut-off, the first current source A1 charges to third capacitor C3, and in third
When the voltage of the second end of capacitor C3 is less than the DC level Vcomp that error amplifying circuit 13 exports, first comparator U5 output
High level, i.e. the R pin of rest-set flip-flop U6 are high level；Meanwhile the height electricity of the same-phase output pin Q output of rest-set flip-flop U6
Redress the grid of the 8th metal-oxide-semiconductor Q8 of feeding so that the 8th metal-oxide-semiconductor Q8 conducting and the 7th metal-oxide-semiconductor Q7 ends, the second comparator U2's
Negative input end is low level, and the output of the second comparator U2 is high level, i.e., the S pin of rest-set flip-flop U6 is high level, due to
The R pin of rest-set flip-flop U6 is also high level at this time, therefore the same-phase output pin Q of rest-set flip-flop U6 keeps current height electricity
Flat output, to maintain the conducting of the first metal-oxide-semiconductor Q1.
Later, as the charging voltage of the second end of third capacitor C3 is continuously increased, when it is greater than error amplifying circuit 13
When the DC level Vcomp of output, first comparator U5 exports low level, so that the R pin jump of rest-set flip-flop U6 is low electricity
Flat, since the S pin of rest-set flip-flop U6 at this time is high level, the same-phase output pin Q jump of rest-set flip-flop U6 is low
Level so that the 6th metal-oxide-semiconductor Q6 is connected and the 5th metal-oxide-semiconductor Q5 cut-off, and then turns off the first metal-oxide-semiconductor Q1.
Later, during the first metal-oxide-semiconductor Q1 shutdown, the low level of the same-phase output pin Q output of rest-set flip-flop U6 is anti-
Feed the input terminal of the second phase inverter U4 so that the output end of the second phase inverter U4 is high level, the 4th metal-oxide-semiconductor Q4 conducting and the
Three metal-oxide-semiconductor Q3 cut-off, so that the output of first comparator U5 is high level, i.e., the R pin of rest-set flip-flop U6 is high level,
Since the S pin of rest-set flip-flop U6 at this time is high level, the same-phase output pin Q of rest-set flip-flop U6 keeps current low
Level output, to maintain the shutdown of the first metal-oxide-semiconductor Q1；Meanwhile the low level of the same-phase output pin Q output of rest-set flip-flop U6
The grid of the 8th metal-oxide-semiconductor Q8 is fed back to, so that the 8th metal-oxide-semiconductor Q8 ends and the 7th metal-oxide-semiconductor Q7 conducting, the 4th capacitor C4 starts to fill
Electricity, when the voltage of the second end of the 4th capacitor C4 is greater than the second reference voltage source 151, the second comparator U2 exports low level,
I.e. the S pin of rest-set flip-flop U6 is low level, and the R pin of rest-set flip-flop U6 is high level at this time, therefore rest-set flip-flop U6
Same-phase output pin Q exports high level, so that the first metal-oxide-semiconductor Q1 restores conducting, repeatedly, realizes the on-off of switching circuit
Control, turn-off time control circuit 15 set the fixed turn-off time, by selecting suitable inductance L1, so that system work exists
Under discontinuous mode.
Error amplifying circuit 13 (that is to say the source electrode electricity of the second metal-oxide-semiconductor Q2 by the first end voltage to constant-current source circuit
Pressure) be sampled, sampling voltage is compared with the voltage of third reference voltage source, and to the two progress error amplification after,
It is output to turn-on time control circuit 14, then passes through the on-off of control switch circuit 11, adjusts the first of constant-current source circuit 16
Voltage is held, that is to say the voltage between the source drain of the second metal-oxide-semiconductor Q2 of adjustment, makes the work of constant-current source circuit 16 normal
Constant current state, so that the constant current hold of input LED load.
Fig. 4 shows the structure of the High-power-factor constant current control circuit of second embodiment of the invention offer, for the ease of
Illustrate, illustrates only part relevant to second embodiment of the invention.
It is different from the first embodiment, which further includes second resistance R2 and 3rd resistor
It is connected in parallel between the ground terminal of inductance L1 and the first end of LED load after R3, second resistance R2 and 3rd resistor R3 series connection, and the
One end that two resistance R2 are connect with resistance R3 connects turn-off time control circuit 15 simultaneously.
At this point, being different from the first embodiment, turn-off time control circuit 15 is used for according to second resistance R2 and 3rd resistor
(in real work, the voltage division signal of second resistance R2 and 3rd resistor R3 set up the mistake for being calculated as inductive current to the voltage division signal of R3
The detection signal of zero point), opening control signal is exported to pulse signal generative circuit 12, with the conducting of control switch circuit 11, and
It is non-when the turn-off time of switching circuit 11 reaching the second time preset value, to pulse pulse signal generating circuit 12 export open
Control signal.I other words the open state of switching circuit 11 is controlled by the working condition of LED load under such structure,
Rather than by the set time control of 1 internal circuit of constant-current driven chip setting, user can be by second resistance R2 and third
The resistance value of resistance R3 sets to adjust the opening time of switching circuit 11, and flexibility is higher.
Fig. 5 shows the circuit of Fig. 4.
It is different from shown in Fig. 3, at this point, the same-phase output pin Q of rest-set flip-flop U6 is not in pulse signal generative circuit 12
It is connect with turn-off time control circuit 15；Turn-off time control circuit 15 may include: the second comparator U2, the second reference voltage
Source 151.Wherein, the negative input end connection second resistance R2 of the second comparator U2, one end for being connect with 3rd resistor R3, second
The positive input terminal of comparator U2 connects the second reference voltage source 151, and the output end connection pulse signal of the second comparator U2 generates
Circuit 12 specifically connects the S pin of rest-set flip-flop U6.The structure and connection relationship of remaining each section are same as shown in Figure 3,
This is not repeated.
Fig. 6 shows the structure of the High-power-factor constant current control circuit of third embodiment of the invention offer, for the ease of
Illustrate, illustrates only part relevant to third embodiment of the invention.
Different from first embodiment and second embodiment, which uses reverse exciting topological knot
Structure, including the rectifier circuit 2, constant-current driven chip 1, the first transformer T1, that electric main Vac is rectified and exported
Four resistance R4, the 5th resistance R5, the 5th capacitor C5, the second diode D2, the second capacitor C2.
Wherein, the output end of the first end connection rectifier circuit 2 of the primary side winding B1 of the first transformer T1, primary side winding
The second end of B1 connects constant-current driven chip 1, and the first end of the vice-side winding B2 of the first transformer T1 connects the second diode D2
Anode, the second diode D2 cathode connection LED load first end simultaneously pass through the 5th capacitor C5 connection equipotential signal ground
SGND；The second end of the first end connection vice-side winding B2 of the auxiliary winding B3 of first transformer T1 simultaneously connects equipotential signal ground
After SGND, the 4th resistance R4 and the 5th resistance R5 series connection, it is connected in parallel between the first end and second end of auxiliary winding B3；LED is negative
The second end of load connects constant-current driven chip 1.
At this point, constant-current driven chip 1 includes: switching circuit 11, the input terminal connection primary side winding B1's of switching circuit 11
Second end；Pulse signal generative circuit 12,12 connection switch circuit 11 of pulse signal generative circuit；Error amplifying circuit 13,
Error amplifying circuit 13 connects the first end of constant-current source circuit 16 and the second end of LED load；Turn-on time control circuit 14,
Turn-on time control circuit 14 connects pulse signal generative circuit 12 and error amplifying circuit 13, and the first end of the second capacitor C2
It is connect altogether with the input terminal of turn-on time control circuit 14 and the output end of error amplifying circuit 13, the second end of the second capacitor C2 connects
Meet equipotential signal ground SGND；Turn-off time control circuit 15, turn-off time control circuit 15 connect pulse signal generative circuit
12, and turn-off time control circuit 15 connects one end that the 4th resistance R4 is connect with the 5th resistance R5 simultaneously；Constant-current source circuit 16,
The second end of the first end connection LED load of constant-current source circuit 16, the second end of constant-current source circuit 16 connect equipotential signal ground
SGND.Meanwhile pulse signal generative circuit 12, error amplifying circuit 13, turn-on time control circuit 14, turn-off time control electricity
Road 15 connects equipotential signal ground SGND；Pulse signal generative circuit 12, error amplifying circuit 13, turn-on time control circuit
14, turn-off time control circuit 15, constant-current source circuit 16 power end connect direct current VCC jointly.It is each in constant-current driven chip 1
The specific structure of circuit is as described in embodiment two, and this will not be repeated here.
It is different from first embodiment and second embodiment, the second end of the first end connection LED load of constant-current source circuit 16
(i.e. the output end of LED load), error amplifying circuit 13 pass through first end voltage (the i.e. LED load to the constant-current source circuit 16
Output end voltage) it is sampled, sampling voltage is compared with a reference voltage, the two is amplified by error, is output to and is led
Logical time control circuit, then passes through the on-off of control switch circuit, adjusts the input voltage of constant-current source circuit, keeps constant-current source electric
Road works in normal constant current state, so that LED load passes through constant current.In addition, turn-off time control circuit 15 is used for
According to the voltage division signal of the 4th resistance R4 and the 5th resistance R5, opening control signal is exported to pulse signal generative circuit 12, with
Control switch circuit 11 is opened, i other words, under such structure, the open state of switching circuit 11 is equally by LED load
Working condition control, rather than by the set time control of 1 internal circuit of constant-current driven chip setting, user can be by the
The resistance value of four resistance R4 and the 5th resistance R5 sets to adjust the opening time of switching circuit 11, and flexibility is higher.
Fig. 7 shows the structure of the High-power-factor constant current control circuit of fourth embodiment of the invention offer, for the ease of
Illustrate, illustrates only part relevant to fourth embodiment of the invention.
Different from previous embodiment, which uses boost topology, including to exchange
Rectifier circuit 2, constant-current driven chip 1, the second transformer T2, the 6th resistance R6, the 7th that alternating current Vac is rectified and exported
Resistance R7, the 6th capacitor C6, third diode D3, the second capacitor C2.
Wherein, the output end of the first end connection rectifier circuit 2 of the primary side winding B4 of the second transformer T2, primary side winding
The second end of B4 connects constant-current driven chip 1, and connects the anode of third diode D3, the cathode connection of third diode D3
The first end of LED load simultaneously passes through the 6th capacitor C6 connection equipotential signal ground SGND；The vice-side winding B5 of second transformer T2
First end pass through the 6th resistance R6 and the 7th resistance R7 connection equipotential signal ground SGND that are serially connected, vice-side winding B5's
Second end connects equipotential signal ground SGND；The second end of LED load connects constant-current driven chip 1.
At this point, constant-current driven chip 1 includes: switching circuit 11, the input terminal connection primary side winding B4's of switching circuit 11
Second end；Pulse signal generative circuit 12,12 connection switch circuit 11 of pulse signal generative circuit；Error amplifying circuit 13,
Error amplifying circuit 13 connects the first end of constant-current source circuit 16 and the second end of LED load；Turn-on time control circuit 14,
Turn-on time control circuit 14 connects pulse signal generative circuit 12 and error amplifying circuit 13, and the first end of the second capacitor C2
It is connect altogether with the input terminal of turn-on time control circuit 14 and the output end of error amplifying circuit 13, the second end of the second capacitor C2 connects
Meet equipotential signal ground SGND；Turn-off time control circuit 15, turn-off time control circuit 15 connect pulse signal generative circuit
12, and turn-off time control circuit 15 connects one end that the 6th resistance R6 is connect with the 7th resistance R7 simultaneously；Constant-current source circuit 16,
The second end of the first end connection LED load of constant-current source circuit 16, the second end of constant-current source circuit 16 connect equipotential signal ground
SGND.Meanwhile pulse signal generative circuit 12, error amplifying circuit 13, turn-on time control circuit 14, turn-off time control electricity
Road 15 connects equipotential signal ground SGND；Pulse signal generative circuit 12, error amplifying circuit 13, turn-on time control circuit
14, turn-off time control circuit 15, constant-current source circuit 16 power end connect direct current VCC jointly.It is each in constant-current driven chip 1
The specific structure of circuit is as described in embodiment two, and this will not be repeated here.
Identical as embodiment three, the first end of constant-current source circuit 16 connects LED load output end, and error amplifying circuit 13 is logical
It crosses and the first end voltage (i.e. LED load output end voltage) of the constant-current source circuit 16 is sampled, by sampling voltage and a base
Quasi- voltage is compared, and the two is amplified by error, is output to turn-on time control circuit 14, then passes through control switch circuit
On-off, adjust the input voltage of constant-current source circuit, make constant-current source circuit work in normal constant current state, so that LED is negative
Load passes through constant current.In addition, turn-off time control circuit 15 is used to be believed according to the partial pressure of the 6th resistance R6 and the 7th resistance R7
Number, opening control signal is exported to pulse signal generative circuit 12, with the unlatching of control switch circuit 11, i other words, in such knot
Under structure, the open state of switching circuit 11 is controlled by the working condition of LED load, rather than by constant-current driven chip 1
The set time control of internal circuit setting, user can be set by the resistance value to the 6th resistance R6 and the 7th resistance R7 to adjust
The opening time of whole switching circuit 11, flexibility are higher.
Fifth embodiment of the invention provides a kind of LED illumination device, the Gao Gong including LED load and connection LED load
Rate factor constant current control circuit, the High-power-factor constant current control circuit are first embodiment of the invention as above to fourth embodiment
High-power-factor constant current control circuit described in middle any embodiment, this will not be repeated here.
High-power-factor constant current control circuit proposed by the present invention is on existing High-power-factor constant current control circuit basis
On, increase by a constant-current source circuit in constant-current driven chip, the error amplifying circuit in constant-current driven chip passes through to the constant current
The first end voltage of source circuit is sampled, and sampling voltage is compared with a reference voltage, and the two is amplified by error, defeated
Turn-on time control circuit is arrived out, is then passed through the on-off of control switch circuit, is adjusted the first end voltage of constant-current source circuit, make
Constant-current source circuit work is in normal constant current state, so that LED load passes through constant current, to eliminate ripple to LED
The influence of load, and then stroboscopic phenomenon is eliminated, human eye health can be protected, user experience is promoted.
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 (9)
1. a kind of High-power-factor constant current control circuit, including rectifier circuit and constant-current driven chip, which is characterized in that described
Constant-current driven chip includes:
Switching circuit, whether for controlling output of the rectifier circuit to LED load by off operating mode；
Pulse signal generative circuit, for generating the modulated signal for controlling the on off operating mode of the switching circuit；
Turn-on time control circuit, for when the turn-on time of the switching circuit reaches first time preset value, Xiang Suoshu
Pulse signal generative circuit output shutdown control signal, to control the switching circuit shutdown；
Turn-off time control circuit, for exporting opening control signal to the pulse signal generative circuit, to be opened described in control
Powered-down road conducting；
Constant-current source circuit, in the voltage change of the first end of the constant-current source circuit, generating constant output electric current, with
So that the LED load passes through constant current；
Error amplifying circuit, the voltage for the first end to the constant-current source circuit are sampled, and by sampling voltage and the
Output is to the turn-on time control circuit after the voltage of three reference voltage sources carries out error amplification；
The High-power-factor constant current control circuit further includes the first transformer, the 4th resistance, the 5th resistance, the 5th capacitor,
Two diodes, the second capacitor；It or further include the second transformer, the 6th resistance, the 7th resistance, the 6th capacitor, third diode,
Two capacitors；
The first end of the primary side winding of first transformer connects the output end of the rectifier circuit, the primary side winding
Second end connects the constant-current driven chip, and the first end of the vice-side winding of first transformer connects second diode
Anode, the cathode of second diode connects the first end of the LED load and by electricity such as the 5th capacitance connections
Gesture signal ground, the first end of the auxiliary winding of first transformer connect the second end of the vice-side winding and connect described etc.
Electric potential signal, after the 4th resistance and the 5th resistance series connection, it is connected in parallel on the first end and second of the auxiliary winding
Between end, the second end of the LED load connects the constant-current driven chip；
The input terminal of the switching circuit connects the second end of the primary side winding, and the error amplifying circuit connects the constant current
The second end of the first end of source circuit and the LED load, the turn-off time control circuit connect the 4th resistance with
One end of the 5th resistance connection, the first end of the constant-current source circuit connect the second end of the LED load, the constant current
The second end of source circuit connects the equipotential signal ground, the first end of second capacitor and the turn-on time control circuit
Input terminal and the output end of the error amplifying circuit connect altogether, and the second end of second capacitor connects the equipotential letter
Number ground；
The first end of the primary side winding of second transformer connects the output end of the rectifier circuit, the primary side winding
Second end connects the constant-current driven chip, and connects the anode of the third diode, and the cathode of the third diode connects
Connect the first end of the LED load and by the 6th capacitance connection equipotential signal ground, the secondary side of second transformer
The first end of winding passes through the 6th resistance being serially connected and connects the equipotential signal ground with the 7th resistance, described
The second end of vice-side winding connects the equipotential signal ground, and the second end of the LED load connects the constant-current driven chip；
The input terminal of the switching circuit connects the second end of the primary side winding, and the error amplifying circuit connects the constant current
The second end of the first end of source circuit and the LED load, the turn-off time control circuit connect the 6th resistance with
One end of the 7th resistance connection, the first end of the constant-current source circuit connect the second end of the LED load, the constant current
The second end of source circuit connects the equipotential signal ground, the first end of second capacitor and the turn-on time control circuit
Input terminal and the output end of the error amplifying circuit connect altogether, and the second end of second capacitor connects the equipotential letter
Number ground.
2. High-power-factor constant current control circuit as described in claim 1, which is characterized in that the high power factor constant current control
Circuit processed further includes first capacitor, the second capacitor, first diode, inductance；
The output end of the switching circuit connects the first end of the first capacitor and the cathode of the first diode, described
The plus earth of first diode；
The first end of the constant-current source circuit connects the output end of the switching circuit, and the second end of the constant-current source circuit connects
The first end of the LED load is connect, the second end of the LED load connects the second end of the first capacitor, the LED load
Second end also pass through the inductance and be grounded；
The first end of second capacitor and the output end of the error amplifying circuit and the turn-on time control circuit
Input terminal connects altogether, and the second end of second capacitor connects equipotential signal ground.
3. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the pulse signal generative circuit
It include: the 6th metal-oxide-semiconductor, the first phase inverter, rest-set flip-flop of the 5th metal-oxide-semiconductor of N-type, N-type；
The drain electrode of 5th metal-oxide-semiconductor connects direct current, and the source electrode of the 5th metal-oxide-semiconductor connects the drain electrode of the 6th metal-oxide-semiconductor
And the switching circuit is connected, the source electrode of the 6th metal-oxide-semiconductor connects equipotential signal ground, the grid connection of the 6th metal-oxide-semiconductor
The output end of first phase inverter, the input terminal of first phase inverter connect the grid of the 5th metal-oxide-semiconductor, and connect institute
The same-phase output pin of rest-set flip-flop is stated, the same-phase output pin of the rest-set flip-flop connects the turn-on time control simultaneously
Circuit processed, the S pin of the rest-set flip-flop connect the turn-off time control circuit, and the R pin of the rest-set flip-flop connects institute
State turn-on time control circuit.
4. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the turn-on time control circuit
It include: first comparator, the first current source, the second phase inverter, the 4th metal-oxide-semiconductor of N-type, the third metal-oxide-semiconductor of p-type, third capacitor；
The input terminal of second phase inverter connects the pulse signal generative circuit, the output end connection of second phase inverter
The source electrode of the grid of 4th metal-oxide-semiconductor, the 4th metal-oxide-semiconductor connect equipotential letter with the first end of the third capacitor jointly
Number ground, the drain electrode of the 4th metal-oxide-semiconductor connect the second end of the third capacitor, the first comparator negative input end and
The drain electrode of the third metal-oxide-semiconductor, the source electrode of the third metal-oxide-semiconductor connect the output end of first current source, first ratio
The error amplifying circuit is connected compared with the positive input terminal of device, the output end of the first comparator connects the pulse signal and generates
Circuit.
5. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the error amplifying circuit packet
It includes: first error amplifier and third reference voltage source；
The third reference voltage source connects the positive input terminal of the first error amplifier, and the first error amplifier is born
Input terminal connects the first end of the constant-current source circuit, and the output end of the first error amplifier connects the turn-on time control
The first end of circuit processed and second capacitor.
6. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the constant-current source circuit includes:
First reference voltage source, the second error amplifier, the second metal-oxide-semiconductor of N-type and first resistor；
The positive input terminal of second error amplifier connects first reference voltage source, and second error amplifier is born
Input terminal connects the source electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor connects the first end of the first resistor, institute
Second end of the second end of first resistor as the constant-current source circuit is stated, the drain electrode of second metal-oxide-semiconductor is as the constant current
The first end of source circuit, the grid of second metal-oxide-semiconductor connect the output end of second error amplifier.
7. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the turn-off time control circuit
It include: the second comparator, the second reference voltage source, the second current source, the 8th metal-oxide-semiconductor of N-type, the 7th metal-oxide-semiconductor of p-type, the 4th
Capacitor；
The grid of 8th metal-oxide-semiconductor connects the pulse signal generative circuit, the source electrode and the 4th capacitor of the 8th metal-oxide-semiconductor
First end connect equipotential signal ground jointly, the drain electrode of the 8th metal-oxide-semiconductor connects the second end of the 4th capacitor, described
The drain electrode of the negative input end of second comparator and the 7th metal-oxide-semiconductor, the source electrode connection of the 7th metal-oxide-semiconductor second electricity
The output end in stream source, the grid of the 7th metal-oxide-semiconductor connect the grid of the 8th metal-oxide-semiconductor, second comparator it is just defeated
Enter end and connect second reference voltage source, the output end of second comparator connects the pulse signal generative circuit.
8. High-power-factor constant current control circuit as claimed in claim 2, which is characterized in that the high power factor constant current control
Circuit processed further includes second resistance and 3rd resistor, is connected in parallel on the inductance after the second resistance and 3rd resistor series connection
Ground terminal and the LED load first end between；The turn-off time control circuit includes: the second comparator, the second base
Reference voltage source；
One end that the negative input end of second comparator connects the second resistance, being connect with the 3rd resistor, it is described
The positive input terminal of second comparator connects second reference voltage source, is that the output end of the second comparator connects the pulse letter
Number generative circuit.
9. a kind of LED illumination device, the High-power-factor constant current control circuit including LED load and the connection LED load,
It is characterized in that, the High-power-factor constant current control circuit is high power factor constant current as claimed in any one of claims 1 to 8
Control circuit.
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| CN201310552793.3A CN104640268B (en) | 2013-11-07 | 2013-11-07 | A kind of High-power-factor constant current control circuit and LED illumination device |
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| CN104981060B (en) * | 2015-06-18 | 2016-08-31 | 深圳市晟碟半导体有限公司 | A kind of linear constant current LED drive device reducing wick quantity |
| CN108513403B (en) * | 2018-04-17 | 2020-11-10 | 南京矽力微电子技术有限公司 | Control circuit and control method of power converter |
| CN111511074B (en) * | 2020-05-04 | 2021-11-23 | 陕西亚成微电子股份有限公司 | LED driving circuit and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202587506U (en) * | 2012-04-23 | 2012-12-05 | 电子科技大学 | Adjustable constant current source |
| CN102958258A (en) * | 2012-11-19 | 2013-03-06 | 深圳市明微电子股份有限公司 | High power factor constant current driving circuit |
| CN202840938U (en) * | 2012-08-27 | 2013-03-27 | 上海占空比电子科技有限公司 | Constant current control circuit capable of power factor correction |
| CN103259427A (en) * | 2013-05-28 | 2013-08-21 | 深圳市明微电子股份有限公司 | High-power-factor constant-current control circuit with open circuit protection |
| CN203279247U (en) * | 2013-02-27 | 2013-11-06 | 深圳市华高芯源科技有限公司 | Flicker-free LED drive power with high power factor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013200327A (en) * | 2012-03-23 | 2013-10-03 | Sony Corp | Light emitting element drive device, light emitting element drive method and display device |
| CN102843844B (en) * | 2012-09-28 | 2015-06-03 | 深圳市明微电子股份有限公司 | LED (Light Emitting Diode) control circuit and LED illumination device |
| CN103347350B (en) * | 2013-07-29 | 2015-04-22 | 常熟银海集成电路有限公司 | Isolated constant-current LED (light-emitting diode) drive chip of peripheral circuit free of auxiliary winding of transformer |
-
2013
- 2013-11-07 CN CN201310552793.3A patent/CN104640268B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202587506U (en) * | 2012-04-23 | 2012-12-05 | 电子科技大学 | Adjustable constant current source |
| CN202840938U (en) * | 2012-08-27 | 2013-03-27 | 上海占空比电子科技有限公司 | Constant current control circuit capable of power factor correction |
| CN102958258A (en) * | 2012-11-19 | 2013-03-06 | 深圳市明微电子股份有限公司 | High power factor constant current driving circuit |
| CN203279247U (en) * | 2013-02-27 | 2013-11-06 | 深圳市华高芯源科技有限公司 | Flicker-free LED drive power with high power factor |
| CN103259427A (en) * | 2013-05-28 | 2013-08-21 | 深圳市明微电子股份有限公司 | High-power-factor constant-current control circuit with open circuit protection |
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