CN105958825A - Primary side current control drive circuit - Google Patents
Primary side current control drive circuit Download PDFInfo
- Publication number
- CN105958825A CN105958825A CN201610398181.7A CN201610398181A CN105958825A CN 105958825 A CN105958825 A CN 105958825A CN 201610398181 A CN201610398181 A CN 201610398181A CN 105958825 A CN105958825 A CN 105958825A
- Authority
- CN
- China
- Prior art keywords
- unit
- ripple
- primary current
- current
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a primary side current control drive circuit. A primary side current drive control unit controls a switch tube according to a current reference signal and the first sampling signal outputted by a primary side current sampling unit such that primary side current is stabilized at a set value, the load current is stable, the set value is adjusted according to the compensation signal outputted by a compensation signal generation unit, the load current is not changed with the change of load voltage, the load adjustment rate is raised, and the stable current driving is realized. At the same time, through a ripple removing unit, the output ripple after the series connection of a power unit and the ripple removing unit is eliminated or reduced through the ripple removing unit, the low ripple output is realized without accelerating a loop response speed, and the problem that the output ripple and a PF value are in mutual suppression and can not be balanced at the same time in the prior art is avoided.
Description
Technical field
The present invention relates to LED actuation techniques field, particularly relate to a kind of primary current and control drive circuit.
Background technology
LED, as a kind of novel illumination device, owing to its luminous efficiency is high, is widely used in illumination neck
Territory, and it typically requires current stabilization and drives, the LED driver driven as its current stabilization in the prior art is
Realize characteristic with low cost and simple in construction, frequently with single-stage solution.
Use single-stage primary current driver as shown in Figure 1, eliminate the optical coupling isolation circuit of complexity,
But owing to PFC (Power Factor Correction, PFC) function taken into account by needs, i.e.
It controls loop needs the slowest response speed just can have higher PF (Power Factor, power factor)
Value, therefore, it is relatively slow that it controls loop response speed, and this can cause output electric current to have bigger ripple,
The cycle of this ripple is the half in input ac voltage cycle.And when controlling loop response speed,
Although the ripple of output electric current can be reduced, but reduce PF value simultaneously.
Therefore, single-stage primary current driver of the prior art, the mutually restriction of its output ripple and PF value,
It is difficult to realize high PF value and low ripple simultaneously.
Summary of the invention
In view of this, the invention provides a kind of primary current and control drive circuit, to solve prior art
It is difficult to realize high PF value and the problem of low ripple simultaneously, and the primary current that the present invention provides controls to drive
Circuit has the highest load regulation.
To achieve these goals, the technical scheme that the embodiment of the present invention provides is as follows:
A kind of primary current controls drive circuit, including: transformator, primary circuit and secondary circuit；Its
In:
Described transformator includes: primary side winding, the first vice-side winding and the second vice-side winding；
Described primary circuit includes: primary current drives control unit, primary current sampling unit, compensation
Signal generation unit and switching tube；After described primary side winding, switching tube and the series connection of primary current sampling unit
It is linked into input power；
Described primary current sampling unit characterizes the first sampled signal of primary current for obtaining；
Described compensation signal generation unit is for producing a compensation signal relevant to load voltage；
Described primary current drives control unit to receive described first sampled signal and described compensation signal, and
Described first sampled signal received is compared with current reference signal, controls institute according to comparative result
State switching tube, so that described primary current is stable in setting value, and then make load current stable；According to connecing
The described compensation signal received adjusts described setting value so that described load current is not with the change of load voltage
And change；
Described secondary circuit includes: the power cell being connected with described first vice-side winding, and with described
What the second vice-side winding was connected removes ripple unit；The outfan of described power cell and described remove ripple unit
Outfan series connection after be load supplying, described in remove the output ripple of ripple unit and described power cell
Output ripple opposite in phase.
Preferably, described compensation signal generation unit includes that the tertiary winding, the described tertiary winding are used for obtaining
Compensation signal positively related with described load voltage；The earth terminal of the described tertiary winding and described primary circuit
Ground be connected.
Preferably, described compensation signal generation unit also includes: the first resistance and the second resistance；
One end of described first resistance is connected with the other end of the described tertiary winding；
The other end of described first resistance is connected with one end of described second resistance, and described compensation signal passes through
The junction point of described first resistance and the second resistance is input to primary current and drives control unit.
Preferably, described primary current sampling unit includes the 3rd resistance；
Described primary side winding, switching tube and the 3rd resistance are linked into described input power after being sequentially connected in series；
The other end of described second resistance is connected with the common port of described switching tube and the 3rd resistance, and described
By described first resistance and the connection of described second resistance after one sampled signal and described compensation Signal averaging
Point is input to primary current and drives control unit.
Preferably, the described tertiary winding is additionally operable to drive control unit to provide power supply electricity into described primary current
Source.
Preferably, described power cell is the first commutator unit, and described first commutator unit is to described
The output voltage of the second vice-side winding carries out rectifying and wave-filtering.
Preferably, go ripple unit to include described in: the second commutator unit, DC/DC varitron unit and
Voltage loop controls subelement；
The input of described second commutator unit is connected with the two ends of described second vice-side winding；
The outfan of described second commutator unit is connected with the input of described DC/DC varitron unit；
The outfan of described DC/DC varitron unit removes the outfan of ripple unit described in being；
Described Voltage loop control the input of subelement respectively with the outfan of described DC/DC varitron unit
It is connected with the outfan of described power cell；
Described Voltage loop controls the outfan of subelement and the control end phase of described DC/DC varitron unit
Even；
Described Voltage loop controls subelement for obtaining the second of the output voltage removing ripple unit described in sign
Sampled signal, obtains the ripple signal of described power cell, and according to described second sampling and described power
The ripple signal of unit removes the output ripple of ripple unit and the output ripple of described power cell described in controlling
In opposite direction.
Preferably, described Voltage loop control subelement be additionally operable to control described in go that ripple unit exports average
Voltage is constant.
Preferably, described DC/DC varitron unit is buck circuit.
Preferably, described first commutator unit and described second commutator unit all include: diode and
Electric capacity；
The anode of described diode is an input of the commutator unit at its place；
The negative electrode of described diode is connected with one end of described electric capacity；
The other end of described electric capacity is another input of commutator unit at its place.
The application provides a kind of primary current to control drive circuit, drives control unit root by primary current
The first sampled signal exported according to current reference signal and primary current sampling unit, controls switching tube,
So that primary current is stable in setting value, and then make load current stable；And produce single according to compensating signal
The compensation signal of unit's output adjusts described setting value so that described load current is not with the change of load voltage
And change, and then improve load regulation, it is achieved current stabilization drives；Meanwhile, ripple unit is removed by described
Eliminate or reduce described power cell with described go ripple unit to connect after output ripple, it is not necessary to by adding
Fast loop response speed realizes low ripple output, it is to avoid in prior art, output ripple and PF value are mutually
Restriction, the problem being difficult to simultaneously take into account.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 controls the structural representation of drive circuit for a kind of primary current that prior art provides；
Fig. 2 controls the structural representation of drive circuit for a kind of primary current that the application one embodiment provides；
Fig. 3 controls the structural representation of drive circuit for a kind of primary current that another embodiment of the application provides
Figure；
Fig. 4 controls the circuit diagram of subelement for a kind of Voltage loop that the application one embodiment provides；
Fig. 5 controls the circuit signal of subelement for another Voltage loop that another embodiment of the application provides
Figure.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The invention provides a kind of primary current and control drive circuit, real to solve the while that prior art being difficult to
Existing high PF value and the problem of low ripple, and there is the highest load regulation.
Concrete, described primary current controls drive circuit, as in figure 2 it is shown, include: transformator T, former
Limit circuit 100 and secondary circuit 200；Wherein:
Transformator T includes: primary side winding S1, the first vice-side winding S2 and the second vice-side winding S3；
Primary circuit 100 includes: primary current drive control unit 101, primary current sampling unit 102,
Compensate signal generation unit 103 and switching tube K；Primary side winding S1, switching tube K and primary current sampling
Being linked into input power (voltage is Vin) after unit 102 series connection, described input power can be to export
The front stage circuits of voltage Vin；
Secondary circuit 200 includes: the power cell 201 being connected with the first vice-side winding S2, and with
What two vice-side winding S3 were connected removes ripple unit 202；The outfan of power cell 201 and remove ripple unit
It is load supplying after the outfan series connection of 202.
Concrete operation principle is:
Loop controls to be a kind of control mode being usually used in on-off circuit, is used for controlling described on-off circuit
The duty of breaker in middle, it is possible to make the output voltage of on-off circuit or outputting current steadily in a certain value.
Loop control circuit of the prior art generally includes the regulation circuit of the device such as integrated transporting discharging and capacitance-resistance,
And often regulate for closed loop；Described loop control circuit is usually provided with reference edge and (connects a benchmark letter
Number) and sampling end (connecting the sampled signal characterizing output voltage/output electric current) so that this sampled signal
Followed by the change of this reference signal, reach the output voltage/outputting current steadily of described on-off circuit at certain
The purpose of certain value；If this reference signal changes, then output voltage/output electric current also can change accordingly.This
Invention have employed above-mentioned loop control principle.
In the present embodiment, primary current sampling unit 102 is for obtaining the first sampling letter of primary current I1
Number VS1.Compensate signal generation unit 103 for producing a compensation signal VF relevant to load voltage；
Primary current drives control unit 101 for receiving the first sampled signal VS1 and compensating signal VF and right
The first sampled signal VS1 received compares with current reference signal Viref, according to comparative result control
Switching tube K, so that primary current I1 is stable in setting value, and then makes load current stable；And according to connecing
Receive compensation signal VF adjust described setting value so that described load current not with load voltage change and
Change；Power needed for power cell 201 output loading；Go output ripple and the merit of ripple unit 202
The output ripple opposite in phase of rate unit 201, for offsetting the output ripple of power cell 201 so that
Ripple in load diminishes.In concrete actual application, described setting value is by the first sampled signal VS1
Determine with the ratio of current reference signal Viref, be not specifically limited herein.
Concrete, primary current drives control unit 101 to realize the PFC function of circuit and former by controlling
Limit electric current I1 realizes the function of outputting current steadily.Realize the function of PFC as prior art, permissible
Use fixed frequency, the fixing mode such as switching tube ON time or peak value control.But it is negative in order to improve
I.e. no matter carry regulation, load, its output electric current all keeps constant, compensating signal generation unit
The compensation signal VF of 103 and the first sampled signal VS1 of primary current sampling unit 102 are simultaneously entered former
Limit electric current drives the current sample end of control unit 101.
When compensating signal VF and load voltage size positive correlation, use and compensate signal VF and first sampling
With current reference signal Viref[(VS1+VF after signal VS1 superposition) compare with Viref] compare
Relatively, or the first sampled signal VS1 and current reference signal Viref and compensation signal VF subtract each other [VS1
Compare with (Viref-VF)] after compare output control signal control switching tube K duty.
Load voltage Vout increases, and compensates signal VF and increases, then in the case of current reference signal Viref is constant,
First sampled signal VS1 reduces, and primary current drives control unit 101 to control switching tube K so that former
Limit electric current I1 reduces；In like manner, load voltage Vout reduces, and compensates signal VF and reduces, then current reference
In the case of signal Viref is constant, the first sampled signal VS1 increases, and primary current drives control unit
101 control switching tube K so that primary current I1 increases.In sum, by under different loads,
Changing the size of primary current I1, during to obtain load change, described primary current controls drive circuit
Electric current Iout is constant in output.
When compensating signal VF with load voltage size negative correlation, use the first sampled signal VS1 and benefit
Repay after signal VF subtracts each other with reference signal Viref[(VS1-VF) with Viref] compare, or adopt
Enter with compensation signal VF and Viref sum [VS1 and (VF+Viref)] by the first sampled signal VS1
Row compares load voltage: load voltage Vout increases, and compensates signal VF and reduces, then current reference signal
In the case of Viref is constant, the first sampled signal VS1 reduces, and primary current drives control unit 101 to control
Switching tube K processed so that primary current I1 reduces；In like manner, load voltage Vout reduces, and compensates signal
VF increases, then, in the case of current reference signal Viref is constant, the first sampled signal VS1 increases, former
Limit electric current drives control unit 101 to control switching tube K so that primary current I1 increases.In sum,
By under different loads, changing the size of primary current I1, during to obtain load change, described former limit
The output electric current Iout that electric current controls drive circuit is constant.
The described primary current that the present embodiment provides controls drive circuit, has taken into account the electricity of primary current technology
Line structure is simple, the feature of low cost, drives control unit 101 to realize current stabilization by primary current and exports
With high PF value, the function of ripple drops by going ripple unit 202 to realize, it is not necessary to by accelerating loop response
Speed realizes low ripple output, it is to avoid low ripple that existing primary current circuit is difficult to and high PF
The compatibility function of value, and improve described by compensating the compensation signal VF of signal generation unit 103 output
Primary current controls the load regulation of drive circuit, makes described primary current control the output of drive circuit
Electric current will not change along with load change.
In another specific embodiment of the present invention, on the basis of Fig. 2, it is preferred that as it is shown on figure 3,
Compensate signal generation unit 103 and include tertiary winding S4；The output voltage of tertiary winding S4 and primary side winding
The output voltage of S1, the first vice-side winding S2 and the second vice-side winding S3 is all directly proportional, therefore the 3rd around
The voltage of group S4 is directly proportional to load voltage.Tertiary winding S4 earth terminal is connected with the ground of primary circuit,
Therefore, tertiary winding S4 may be used for obtaining and load voltage positively related compensation signal.
Preferably, as it is shown on figure 3, compensate signal generation unit 103 and also include: the first resistance R1 and the
Two resistance R2；
One end of first resistance R1 is connected with the other end of tertiary winding S4；
The other end of the first resistance R1 and one end of the second resistance R2 are connected, and described compensation signal is by the
The junction point of one resistance R1 and the second resistance R2 is input to primary current and drives control unit 101；
The other end of the second resistance R2 is connected with the outfan of primary current sampling unit 102, described compensation
Signal is input to former limit after being superposed by the first resistance R1 and the second resistance R2 with described first sampled signal
Electric current drives control unit 101.
In the present embodiment, when the benchmark (i.e. current reference signal Viref) of primary current I1 is constant, when negative
Carrying voltage Vout to increase, the out-put supply V1 of power cell 201 increases, then the output of tertiary winding S4
Voltage V4 increases, then compensate the compensation signal VF that signal acquiring unit 103 produces and increase, then corresponding,
When first sampled signal VS1 of primary current I1 is less, switching tube K1 begins to action so that former limit
Electric current I1 reduces, and counteracts the increase of the electric current I2 increasing the power cell 201 caused because of load voltage,
Thus proof load electric current Iout's is constant.
Preferably, as it is shown on figure 3, primary current drives control unit 101 to include, primary current controls core
Sheet, described primary current control chip includes built-in electric current loop 111 and current reference signal Viref；Electricity
The sampling end of stream ring 111 receives and compensates signal VF and the superposed signal of the first sampled signal VS1, and root
Comparative result output comparison signal according to (VF+VS1) with Viref；
Tertiary winding S4 is additionally operable to provide power supply into described primary current control chip.
Preferably, as it is shown on figure 3, described primary current control chip also includes driving controlling subelement 112；
The input controlling subelement 112 is driven to be connected with electric current loop 111 outfan；
Driving the outfan controlling subelement 112 is the outfan that primary current drives control unit 101；
Control subelement 112 is driven to receive the comparison signal of electric current loop output, and according to described comparison signal
Output drive signal, the duty of described driving Signal-controlled switch pipe K makes primary current I1 with load
The increase of voltage Vout and reduce.
Preferably, as it is shown on figure 3, primary current sampling unit 102 includes the 3rd resistance R3, the 3rd electricity
Resistance R3 is sampling resistor；
Primary side winding S1, switching tube K and the 3rd resistance R3 are linked into described input power after being sequentially connected in series；
The other end of the second resistance R2 is connected with the common port of switching tube K and the 3rd resistance R3.
Preferably, as it is shown on figure 3, power cell is the first commutator unit 211, to the first vice-side winding
After the output voltage of S2 carries out rectifying and wave-filtering, it is input to load.Ripple unit 202 is gone to include: second is whole
Stream subelement 221, DC/DC varitron unit 222 and Voltage loop control subelement 223；
The input of the second commutator unit 221 and the two ends of the second vice-side winding S3 are connected；
The outfan of the second commutator unit 221 is connected with the input of DC/DC varitron unit 222；
The outfan that outfan is ripple unit 202 of DC/DC varitron unit 222；
Voltage loop control the input of subelement 223 respectively with the outfan of DC/DC varitron unit 222
It is connected with the outfan of power cell 201；
Voltage loop controls the outfan of subelement 223 and is connected with the control end of DC/DC varitron unit 222；
Voltage loop controls subelement 223 and removes the second of ripple unit 202 output voltage V2 for obtaining sign
Sampled signal VS2, obtain power cell 201 ripple signal VFB, and according to the second sampled signal VS2,
Ripple signal VFB controls to go to the output ripple of ripple unit 202 and the output ripple side of power cell 201
To on the contrary；The so-called real-time voltage referring to export when power cell 201 in opposite direction is the most electric higher than it
During pressure, going the real-time voltage that ripple unit 202 exports less than its average voltage, therefore both ripples are
Can cancel out each other, the ripple in load reduces；Actual and that load average voltage is actual is power cell
201 and go the average voltage sum that ripple unit 202 exports.
For the ripple being completely eliminated in load, setting simultaneously goes the output voltage V2's of ripple unit 202
Ripple is in opposite direction, equal in magnitude with the ripple of the output voltage V1 of power cell 201.Ripple signal
The average voltage of VFB determines the average voltage of ripple unit 202 output；Ripple signal VFB's is flat
All voltage is determined by the size of the peak-to-peak value of power cell 201 output ripple Vpp, relative to load voltage
Change, power cell 201 output ripple Vpp change be slowly, so going ripple unit 202 defeated
The meansigma methods going out voltage is almost unchanged.
Preferably, constant in order to ensure the meansigma methods of ripple unit 202 output voltage, Voltage loop controls
Unit receives or built-in DC reference signal Vref, and according to the second sampled signal VS2, power cell 201
Ripple signal VFB and DC reference signal Vref control to go output ripple and the power of ripple unit 202
The output ripple of unit 201 is in opposite direction.
Therefore, the average voltage going ripple unit 202 to export does not changes with load change, and removes ripple
The output voltage V2 institute band ripple of unit 202 and the ripple direction of the output voltage V1 of power cell 201
On the contrary, equal in magnitude.When load becomes big, described primary current controls the output voltage Vout of drive circuit
Increase, then the output voltage V1 of power cell 201 increases along with the increase of load voltage Vout；This
Time, the voltage on the first vice-side winding S2 and the second vice-side winding S3 can defeated along with power cell 201
Go out voltage V1 to increase and increase, and load current Iout be the change of precision under primary current control,
Therefore the change relative to load voltage Vout is faint, so removing the output of ripple unit 202
Constant, and its input voltage (being the voltage of the second vice-side winding S3) increases, then its input current I3
Reduce.
Transformer current relational expression is N1*I1=N2*I2+N3*I3；Wherein, N1, N2, N3 are respectively
Primary side winding S1, the first vice-side winding S2 and the number of turn of the second vice-side winding S3；I1, I2, I3 are respectively
It is to flow through the electric current on primary side winding S1, the first vice-side winding S2 and the second vice-side winding S3.Former limit electricity
Flow control indeed through control primary current I1 peak steady in a certain value, realize control output
Electric current Iout is constant, therefore drives under the control of control unit 101 at primary current, and primary current I1 protects
Hold constant；And when loading increase, the reduction of the electric current I3 on the second vice-side winding S3 result in the first secondary
The increase of the electric current I2 on winding S2；When this shows load change, load current also can change, make
Described primary current controls the output electric current Iout of drive circuit can not be stable in setting value accurately.
It is thus desirable to inject one to convert relevant compensation signal VF with load voltage to electric current loop 111, when
When load increases (load voltage Vout increase), control first sampled signal VS1 of primary current I1
The pipe that opens the light time less starts action, reduces primary current I1 with this, counteracts by the second vice-side winding S3
Electric current I3 reduce the increments of the electric current I2 of the first vice-side winding S2 caused, therefore, the first secondary
Electric current I2 on winding S2 can keep constant, improves load regulation with this.In like manner, when load lightens,
The output removing ripple unit 202 is held essentially constant, and its input voltage (the second vice-side winding S3
Voltage) reduce, then the electric current I3 on the second vice-side winding S3 increases accordingly；Corresponding control former limit electricity
First sampled signal VS1 of stream I1 controls switching tube action time bigger, increases primary current I1 with this, supports
Disappear and increased subtracting of the electric current I2 of the first vice-side winding S2 that causes by the electric current I3 on the second vice-side winding S3
In a small amount, then the electric current I2 on the first vice-side winding S2 can keep constant, improves load regulation with this.
In another specific embodiment of the present invention, on the basis of Fig. 2, it is preferred that as it is shown on figure 3,
DC/DC varitron unit 222 is buck circuit.
Preferably, as it is shown on figure 3, the first commutator unit 211 and the second commutator unit 221 all wrap
Include: diode D and electric capacity C；
The anode of diode D is an input of the commutator unit at its place；
The negative electrode of diode D is connected with one end of electric capacity C；
The other end of electric capacity C is another input of the commutator unit at its place.
It addition, electric current loop 111 and Voltage loop control subelement 223 all can use reality of the prior art
Existing form, repeats the most one by one.
In concrete actual application, characterize the second sampled signal removing ripple unit 202 output voltage V2
VS2 can be from removing the outfan of ripple unit 202, namely the outfan sampling of buck circuit obtains.
What deserves to be explained is, in order to reduce or eliminate load ripple, make the output ripple of ripple unit
In opposite direction with the output ripple of power cell, Voltage loop control subelement 223 can by with output ripple
Relevant feedback signal VFB and go second sampled signal VS2 of ripple unit 202 output voltage V2
Superposed signal (VFB+VS2) carries out Vref with DC reference signal and compares (as shown in Figure 4), or
Also the second sampled signal VS2 removing ripple unit 202 output voltage V2 can be entered with (Vref-VFB)
Row compares (as shown in Figure 5).All in the protection domain of the application, its concrete application ring can be regarded
Depending on border.
In like manner, compensation signal VF positively related with load voltage can also act on the benchmark of electric current loop 111
End, current reference signal Viref with compensate the difference (Viref-VF) of signal VF as the of primary current I1
The comparison signal of one sampled signal VS1 so that primary current I1 increases along with load voltage Vout and subtracts
Little, thus carry out stablizing of proof load electric current Iout constant.
Particularly, under conditions of described primary current control drive circuit can also apply to light modulation, specifically
Dimming mode is similar with prior art, and here is omitted.
In the present invention, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is
With the difference of other embodiments, between each embodiment, identical similar portion sees mutually.
Below it is only the preferred embodiment of the present invention, makes to skilled artisans appreciate that or realize this
Invention.Multiple amendment to these embodiments will be apparent to one skilled in the art,
Generic principles defined herein can without departing from the spirit or scope of the present invention, at it
Its embodiment realizes.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and
It is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a primary current controls drive circuit, it is characterised in that including: transformator, primary circuit
And secondary circuit；Wherein:
Described transformator includes: primary side winding, the first vice-side winding and the second vice-side winding；
Described primary circuit includes: primary current drives control unit, primary current sampling unit, compensation
Signal generation unit and switching tube；After described primary side winding, switching tube and the series connection of primary current sampling unit
It is linked into input power；
Described primary current sampling unit characterizes the first sampled signal of primary current for obtaining；
Described compensation signal generation unit is for producing a compensation signal relevant to load voltage；
Described primary current drives control unit to receive described first sampled signal and described compensation signal, and
Described first sampled signal received is compared with current reference signal, controls institute according to comparative result
State switching tube, so that described primary current is stable in setting value, and then make load current stable；According to connecing
The described compensation signal received adjusts described setting value so that described load current is not with the change of load voltage
And change；
Described secondary circuit includes: the power cell being connected with described first vice-side winding, and with described
What the second vice-side winding was connected removes ripple unit；The outfan of described power cell and described remove ripple unit
Outfan series connection after be load supplying, described in remove the output ripple of ripple unit and described power cell
Output ripple opposite in phase.
Primary current the most according to claim 1 controls drive circuit, it is characterised in that described benefit
Repaying signal generation unit and include the tertiary winding, the described tertiary winding is for obtaining and described load voltage positive
The compensation signal closed；The earth terminal of the described tertiary winding is connected with the ground of described primary circuit.
Primary current the most according to claim 2 controls drive circuit, it is characterised in that described benefit
Repay signal generation unit also to include: the first resistance and the second resistance；
One end of described first resistance is connected with the other end of the described tertiary winding；
The other end of described first resistance is connected with one end of described second resistance, and described compensation signal passes through
The junction point of described first resistance and the second resistance is input to primary current and drives control unit.
Primary current the most according to claim 3 controls drive circuit, it is characterised in that described former
Limit current sampling unit includes the 3rd resistance；
Described primary side winding, switching tube and the 3rd resistance are linked into described input power after being sequentially connected in series；
The other end of described second resistance is connected with the common port of described switching tube and the 3rd resistance, and described
By described first resistance and the connection of described second resistance after one sampled signal and described compensation Signal averaging
Point is input to primary current and drives control unit.
Primary current the most according to claim 2 controls drive circuit, it is characterised in that described the
Three winding is additionally operable to drive control unit to provide power supply into described primary current.
6. control drive circuit according to the primary current described in any one of claim 1-5, it is characterised in that
Described power cell is the first commutator unit, and described first commutator unit is to described second vice-side winding
Output voltage carry out rectifying and wave-filtering.
Primary current the most according to claim 6 control drive circuit, it is characterised in that described in go
Ripple unit includes: the second commutator unit, DC/DC varitron unit and Voltage loop control subelement；
The input of described second commutator unit is connected with the two ends of described second vice-side winding；
The outfan of described second commutator unit is connected with the input of described DC/DC varitron unit；
The outfan of described DC/DC varitron unit removes the outfan of ripple unit described in being；
Described Voltage loop control the input of subelement respectively with the outfan of described DC/DC varitron unit
It is connected with the outfan of described power cell；
Described Voltage loop controls the outfan of subelement and the control end phase of described DC/DC varitron unit
Even；
Described Voltage loop controls subelement and goes the second of ripple unit output voltage to adopt described in sign for obtaining
Sample signal and the ripple signal of described power cell, and according to described second sampled signal and described power list
The ripple signal of unit goes to the output ripple of ripple unit and the output ripple side of described power cell described in controlling
To on the contrary.
Primary current the most according to claim 7 controls drive circuit, it is characterised in that described electricity
The average voltage that pressure ring control subelement is additionally operable to go ripple unit to export described in control is constant.
Primary current the most according to claim 8 controls drive circuit, it is characterised in that described
DC/DC varitron unit is buck circuit.
Primary current the most according to claim 7 controls drive circuit, it is characterised in that described
First commutator unit and described second commutator unit all include: diode and electric capacity；
The anode of described diode is an input of the commutator unit at its place；
The negative electrode of described diode is connected with one end of described electric capacity；
The other end of described electric capacity is another input of commutator unit at its place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610398181.7A CN105958825B (en) | 2016-06-07 | 2016-06-07 | A kind of primary current control driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610398181.7A CN105958825B (en) | 2016-06-07 | 2016-06-07 | A kind of primary current control driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105958825A true CN105958825A (en) | 2016-09-21 |
| CN105958825B CN105958825B (en) | 2019-04-02 |
Family
ID=56907780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610398181.7A Active CN105958825B (en) | 2016-06-07 | 2016-06-07 | A kind of primary current control driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105958825B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947586A (en) * | 2017-11-07 | 2018-04-20 | 陕西亚成微电子股份有限公司 | A kind of Switching Power Supply fast-response control circuit and control method |
| CN110504826A (en) * | 2018-05-18 | 2019-11-26 | 华润矽威科技（上海）有限公司 | LED drive system goes ripple circuit and method |
| CN113541511A (en) * | 2021-08-16 | 2021-10-22 | 阳光电源股份有限公司 | Hydrogen production power supply and hydrogen production system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110228571A1 (en) * | 2010-03-17 | 2011-09-22 | Chin-Yen Lin | Primary Side Current Controller and Related Power Supply |
| US20130215649A1 (en) * | 2012-02-16 | 2013-08-22 | Fremont Micro Devices (Sz) Limited | Primary-side regulated modulation controller with improved transient response and audile noise |
| CN104703346A (en) * | 2015-02-13 | 2015-06-10 | 英飞特电子（杭州）股份有限公司 | LED driver |
| CN104853493A (en) * | 2015-05-15 | 2015-08-19 | 昂宝电子（上海）有限公司 | Output current adjustment system in power conversion system and method |
-
2016
- 2016-06-07 CN CN201610398181.7A patent/CN105958825B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110228571A1 (en) * | 2010-03-17 | 2011-09-22 | Chin-Yen Lin | Primary Side Current Controller and Related Power Supply |
| US20130215649A1 (en) * | 2012-02-16 | 2013-08-22 | Fremont Micro Devices (Sz) Limited | Primary-side regulated modulation controller with improved transient response and audile noise |
| CN104703346A (en) * | 2015-02-13 | 2015-06-10 | 英飞特电子（杭州）股份有限公司 | LED driver |
| CN104853493A (en) * | 2015-05-15 | 2015-08-19 | 昂宝电子（上海）有限公司 | Output current adjustment system in power conversion system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947586A (en) * | 2017-11-07 | 2018-04-20 | 陕西亚成微电子股份有限公司 | A kind of Switching Power Supply fast-response control circuit and control method |
| CN110504826A (en) * | 2018-05-18 | 2019-11-26 | 华润矽威科技（上海）有限公司 | LED drive system goes ripple circuit and method |
| CN113541511A (en) * | 2021-08-16 | 2021-10-22 | 阳光电源股份有限公司 | Hydrogen production power supply and hydrogen production system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105958825B (en) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10390393B2 (en) | Ripple suppression circuit, suppression method and LED lighting apparatus | |
| CN102098853B (en) | Light emitting element driving system, driving control circuit and driving method | |
| US10015848B2 (en) | Primary side controlled LED driver with ripple cancellation | |
| US10256712B2 (en) | Current ripple sensing controller for a single-stage LED driver | |
| CN104539154B (en) | Switch converter and control circuit thereof | |
| US9872353B2 (en) | LED lighting device and LED illuminating device | |
| CN107852090B (en) | Inverse-excitation type pfc converter with adaptive power factor correcting | |
| CN102332827B (en) | Power supply converter with electricity-saving mechanism and power supply conversion method | |
| EP3595413B1 (en) | Constant current led power supply circuit with maximum output power limiting circuit | |
| CN106304492B (en) | double-circuit constant current circuit and power supply device | |
| CN103763830A (en) | Light-emitting element driving system and drive and control circuit and driving method | |
| CN105934056B (en) | A kind of LED dimming driving circuit | |
| US20140063868A1 (en) | Power supply apparatus with power factor correction and pulse width modulation mechanism and method thereof | |
| TWI511606B (en) | Light emitting diode driving apparatus | |
| CN104349549B (en) | Ignition device and ligthing paraphernalia | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| WO2015109977A1 (en) | Led drive circuit | |
| CN106793243A (en) | 0~10V LED dim signals change-over circuits and LED power light adjusting circuit | |
| CN112785971B (en) | Display device and negative-pressure step power supply circuit | |
| CN104377971A (en) | Flyback direct-drive LED power circuit on basis of voltage feedback and television set | |
| CN105958825A (en) | Primary side current control drive circuit | |
| CN110212765B (en) | Power supply and power supply circuit thereof | |
| CN205546103U (en) | Flyback drive circuit | |
| CN109102780A (en) | Backlight source circuit, backlight module, display device | |
| CN203675399U (en) | Light-emitting element driving system and driving control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |