CN105958825B - A kind of primary current control driving circuit - Google Patents
A kind of primary current control driving circuit Download PDFInfo
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- CN105958825B CN105958825B CN201610398181.7A CN201610398181A CN105958825B CN 105958825 B CN105958825 B CN 105958825B CN 201610398181 A CN201610398181 A CN 201610398181A CN 105958825 B CN105958825 B CN 105958825B
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- 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
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- 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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application provides a kind of primary current control driving circuit, the first sampled signal that primary current drive control unit is exported according to current reference signal and primary current sampling unit, control switch pipe, so that primary current is stablized in setting value, and then stablize load current, and adjust the setting value according to the thermal compensation signal that thermal compensation signal generates unit output, so that the load current does not change with the variation of load voltage, and then load regulation is improved, realize current stabilization driving；Meanwhile by it is described go ripple unit eliminate or reduce the power cell with it is described go ripple unit to connect after output ripple；Without realizing that low ripple exports, and avoids output ripple in the prior art and PF value mutually restricts, is difficult to the problem of combining by accelerating loop response speed.
Description
Technical field
The present invention relates to field of LED drive technologies more particularly to a kind of primary current to control driving circuit.
Background technique
LED is widely used in lighting area due to its luminous efficiency height as a kind of novel illumination device, and it is logical
Often current stabilization is needed to drive, in the prior art as the LED driver of its current stabilization driving in order to which cost of implementation is cheap and structure letter
Single characteristic, frequently with single-stage solution.
Using single-stage primary current driver as shown in Figure 1, complicated optical coupling isolation circuit is eliminated, but due to needing
PFC (Power Factor Correction, PFC) function is taken into account, i.e. its control loop needs very slow sound
Higher PF (Power Factor, power factor) value can be had by answering speed, and therefore, control loop response speed is slower, and
This can cause to export electric current with biggish ripple, and the period of the ripple is the half in input ac voltage period.And when control
When loop response speed is very fast, although the ripple of output electric current can be reduced, but PF value is reduced simultaneously.
Therefore, single-stage primary current driver in the prior art, output ripple and PF value mutually restrict, it is difficult to simultaneously
Realize high PF value and low ripple.
Summary of the invention
In view of this, the present invention provides a kind of primary currents to control driving circuit, it is difficult to simultaneously with solving the prior art
The problem of realizing high PF value and low ripple, and primary current provided by the invention control driving circuit is adjusted with very high load
Whole rate.
To achieve the goals above, technical solution provided in an embodiment of the present invention is as follows:
A kind of primary current control driving circuit, comprising: transformer, primary circuit and secondary circuit；Wherein:
The transformer includes: primary side winding, the first vice-side winding and the second vice-side winding；
The primary circuit includes: primary current drive control unit, primary current sampling unit, thermal compensation signal generation list
Member and switching tube；Input power is linked into after the primary side winding, switching tube and the series connection of primary current sampling unit；
The primary current sampling unit is used to obtain the first sampled signal of characterization primary current；
The thermal compensation signal generates unit for generating a thermal compensation signal relevant to load voltage；
The primary current drive control unit receives first sampled signal and the thermal compensation signal, and to received
First sampled signal is compared with current reference signal, the switching tube is controlled according to comparison result, so that the original
Side electric current is stablized in setting value, and then stablizes load current；The thermal compensation signal adjusts the setting value based on the received, makes
The load current is obtained not change with the variation of load voltage；
The secondary circuit includes: the power cell being connected with first vice-side winding, and with the described second secondary side
What winding was connected removes ripple unit；It is load after the output end of the power cell and the output end series connection for removing ripple unit
Power supply, the output ripple opposite in phase of the output ripple for removing ripple unit and the power cell.
Preferably, it includes the tertiary winding that the thermal compensation signal, which generates unit, and the tertiary winding is born for obtaining with described
Carry the positively related thermal compensation signal of voltage；The ground terminal of the tertiary winding is connected with the ground of the primary circuit.
Preferably, the thermal compensation signal generates unit further include: first resistor and second resistance；
One end of the first resistor is connected with the other end of the tertiary winding；
The other end of the first resistor is connected with one end of the second resistance, and the thermal compensation signal passes through described first
Resistance and the tie point of second resistance are input to primary current drive control unit.
Preferably, the primary current sampling unit includes 3rd resistor；
The primary side winding, switching tube and 3rd resistor are linked into the input power after being sequentially connected in series；
The other end of the second resistance is connected with the common end of the switching tube and 3rd resistor, the first sampling letter
Number and the thermal compensation signal superposition after by the tie point of the first resistor and the second resistance be input to primary current drive
Dynamic control unit.
Preferably, the tertiary winding is also used to provide power supply for the primary current drive control unit.
Preferably, the power cell is the first rectification subelement, and the first rectification subelement is to the described second secondary side
The output voltage of winding carries out rectifying and wave-filtering.
Preferably, it is described go ripple unit include: the second rectification subelement, DC/DC transformation subelement and Voltage loop control
Subelement；
The input terminal of the second rectification subelement is connected with the both ends of second vice-side winding；
The output end of the second rectification subelement is connected with the input terminal of DC/DC transformation subelement；
The output end of the DC/DC transformation subelement is the output end for removing ripple unit；
The input terminal of the Voltage loop control subelement converts the output end and the function of subelement with the DC/DC respectively
The output end of rate unit is connected；
The output end of the Voltage loop control subelement is connected with the control terminal of DC/DC transformation subelement；
The Voltage loop control subelement is used to obtain the second sampling letter of the output voltage that ripple unit is removed described in characterization
Number, the ripple signal of the power cell is obtained, and control according to the ripple signal of second sampling and the power cell
The output ripple for removing ripple unit is contrary with the output ripple of the power cell.
Preferably, the Voltage loop control subelement is also used to control the average voltage for going ripple unit to export not
Become.
Preferably, the DC/DC transformation subelement is buck circuit.
Preferably, the first rectification subelement and the second rectification subelement include: diode and capacitor；
The anode of the diode is an input terminal of the rectification subelement where it；
The cathode of the diode is connected with one end of the capacitor；
The other end of the capacitor is rectification subelement another input terminal where it.
The application provides a kind of primary current control driving circuit, by primary current drive control unit according to electric current base
First sampled signal of calibration signal and the output of primary current sampling unit, control switch pipe, so that primary current stabilization is being set
Value, and then stablize load current；And the setting value is adjusted according to the thermal compensation signal that thermal compensation signal generates unit output, so that
The load current does not change with the variation of load voltage, and then improves load regulation, realizes current stabilization driving；Meanwhile it is logical
Cross it is described go ripple unit eliminate or reduce the power cell with it is described go ripple unit connect after output ripple, be not necessarily to lead to
Quickening loop response speed is crossed to realize that low ripple exports, output ripple in the prior art is avoided and PF value mutually restricts, is difficult
The problem of to combine.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram that a kind of primary current that the prior art provides controls driving circuit；
Fig. 2 is the structural schematic diagram that a kind of primary current that one embodiment of the application provides controls driving circuit；
Fig. 3 is the structural schematic diagram that a kind of primary current that another embodiment of the application provides controls driving circuit；
Fig. 4 is the circuit diagram that a kind of Voltage loop that one embodiment of the application provides controls subelement；
Fig. 5 is the circuit diagram that another Voltage loop that another embodiment of the application provides controls subelement.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of primary currents to control driving circuit, is difficult to realize high PF value simultaneously to solve the prior art
And the problem of low ripple, and there is very high load regulation.
Specifically, the primary current controls driving circuit, as shown in Figure 2, comprising: transformer T, 100 and of primary circuit
Secondary circuit 200；Wherein:
Transformer 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, thermal compensation signal
Generate unit 103 and switching tube K；Primary side winding S1, switching tube K and primary current sampling unit 102 are linked into input after connecting
Power supply (voltage Vin), the input power can be the front stage circuits of energy output voltage Vin；
Secondary circuit 200 includes: the power cell 201 being connected with the first vice-side winding S2, and with the second vice-side winding
What S3 was connected removes ripple unit 202；The output end of power cell 201 and the output end for removing ripple unit 202 are load after connecting
Power supply.
Specific working principle are as follows:
Loop control is a kind of control mode being usually used in switching circuit, is switched in the switching circuit for controlling
Working condition, the output voltage or outputting current steadily that can make switching circuit are in a certain value.Loop control in the prior art
Circuit generally includes the adjusting circuit of the devices such as integrated transporting discharging and capacitance-resistance, and is often adjusted for closed loop；The loop control electricity
Road is usually provided with reference edge (one reference signal of connection) and sampling end (connection characterization output voltage/output electric current sampling
Signal) so that the sampled signal is followed by reference signal variation, have reached output voltage/output electricity of the switching circuit
Stream stablizes the purpose in certain certain value；If the reference signal changes, output voltage/output electric current also can accordingly change.This hair
It is bright to use above-mentioned loop control principle.
In the present embodiment, primary current sampling unit 102 is used to obtain the first sampled signal VS1 of primary current I1.It mends
Repay signal generation unit 103 for generate a thermal compensation signal VF relevant to load voltage；Primary current drive control unit
101 believe for receiving the first sampled signal VS1 and thermal compensation signal VF, and to received first sampled signal VS1 and current reference
Number Viref is compared, and according to comparison result control switch pipe K, so that primary current I1 stablizes in setting value, and then makes to load
Electric current is stablized；And thermal compensation signal VF adjusts the setting value based on the received, so that the load current is not with load voltage
Change and changes；Power needed for 201 output loading of power cell；Remove the output ripple and power cell 201 of ripple unit 202
Output ripple opposite in phase, for offsetting the output ripple of power cell 201 so that load on ripple become smaller.Specific
Practical application in, the setting value is determined by the ratio of the first sampled signal VS1 and current reference signal Viref, herein not
It is specifically limited.
Specifically, primary current drive control unit 101 realizes the PFC function of circuit and by control primary current I1 reality
The function of existing outputting current steadily.The function of PFC is realized as the prior art, fixed frequency, fixed switching tube can be used
The modes such as turn-on time or peak value control.But in order to improve load regulation, i.e., regardless of payload size, output electric current is all
It keeps constant, thermal compensation signal is generated the thermal compensation signal VF of unit 103 and the first sampled signal of primary current sampling unit 102
VS1 inputs the current sampling port of primary current drive control unit 101 simultaneously.
It is folded using thermal compensation signal VF and the first sampled signal VS1 when thermal compensation signal VF and load voltage size are positively correlated
After adding with current reference signal Viref[(VS1+VF) with Viref compared with] be compared or the first sampled signal VS1 with it is electric
Stream reference signal Viref and thermal compensation signal VF is compared output control signal control after subtracting each other [VS1 is compared with (Viref-VF)]
The working condition of switching tube K processed.Load voltage Vout increases, and thermal compensation signal VF increases, then current reference signal Viref is constant
In the case of, the first sampled signal VS1 reduces, 101 control switch pipe K of primary current drive control unit, so that primary current I1
Reduce；Similarly, load voltage Vout reduces, and thermal compensation signal VF reduces, then in the case that current reference signal Viref is constant, the
One sampled signal VS1 increases, 101 control switch pipe K of primary current drive control unit, so that primary current I1 increases.To sum up
It is described, by changing the size of primary current I1 under different loads, when obtaining load variation, the primary current control
The output electric current Iout of driving circuit is constant.
As thermal compensation signal VF and load voltage size negative correlation, using the first sampled signal VS1 and thermal compensation signal VF phase
After subtracting with reference signal Viref[(VS1-VF) and Viref] be compared, or using the first sampled signal VS1 and compensation letter
The sum of number VF and Viref [VS1 and (VF+Viref)] is compared load voltage: load voltage Vout increases, thermal compensation signal VF
Reduce, then in the case that current reference signal Viref is constant, the first sampled signal VS1 reduces, primary current drive control unit
101 control switch pipe K, so that primary current I1 reduces；Similarly, load voltage Vout reduces, and thermal compensation signal VF increases, then electric current
In the case that reference signal Viref is constant, the first sampled signal VS1 increases, 101 control switch of primary current drive control unit
Pipe K, so that primary current I1 increases.In conclusion changing the size of primary current I1 by under different loads, to obtain
When load variation, the output electric current Iout of the primary current control driving circuit is constant.
The primary current provided in this embodiment controls driving circuit, has taken into account the circuit structure letter of primary current technology
Single, at low cost feature realizes current stabilization output and high PF value by primary current drive control unit 101, by removing ripple list
Member 202 realizes the function of drop ripple, without realizing that low ripple exports, and avoids existing primary side by accelerating loop response speed
The compatibility function of low ripple and high PF value that current circuit is difficult to realize, and generate what unit 103 exported by thermal compensation signal
Thermal compensation signal VF improves the load regulation of the primary current control driving circuit, makes the primary current control driving circuit
Output electric current will not with payload size change and change.
In another specific embodiment of the present invention, on the basis of Fig. 2, it is preferred that as shown in figure 3, thermal compensation signal produces
Raw unit 103 includes tertiary winding S4；The output voltage and primary side winding S1, the first vice-side winding S2 and second of tertiary winding S4
The output voltage of vice-side winding S3 is directly proportional, therefore the voltage of tertiary winding S4 is directly proportional to load voltage.Tertiary winding S4
Ground terminal is connected with the ground of primary circuit, and therefore, tertiary winding S4 can be used for obtaining to be believed with the positively related compensation of load voltage
Number.
Preferably, as shown in figure 3, thermal compensation signal generates unit 103 further include: first resistor R1 and second resistance R2；
One end of first resistor R1 is connected with the other end of tertiary winding S4；
The other end of first resistor R1 is connected with one end of second resistance R2, the thermal compensation signal by first resistor R1 and
The tie point of second resistance R2 is input to primary current drive control unit 101；
The other end of second resistance R2 is connected with the output end of primary current sampling unit 102, the thermal compensation signal and institute
The first sampled signal is stated by being input to primary current drive control unit 101 after first resistor R1 and second resistance R2 superposition.
In the present embodiment, when the benchmark (i.e. current reference signal Viref) of primary current I1 is constant, as load voltage Vout
Increase, the out-put supply V1 of power cell 201 increases, then the output voltage V4 of tertiary winding S4 increases, then thermal compensation signal obtains
The thermal compensation signal VF that unit 103 generates increases, then corresponding, when the first sampled signal VS1 of primary current I1 is smaller, switching tube
K1 begins to act, so that primary current I1 reduces, counteracts the electric current I2 of power cell 201 caused by increasing because of load voltage
Increase, so that proof load electric current Iout's is constant.
Preferably, as shown in figure 3, primary current drive control unit 101 includes that primary current controls chip, the primary side
Current control chip includes built-in electric current loop 111 and current reference signal Viref；The sampling end of electric current loop 111 receives compensation
The superposed signal of signal VF and the first sampled signal VS1, and according to the output of the comparison result of (VF+VS1) and Viref compared with letter
Number；
Tertiary winding S4, which is also used to control chip for the primary current, provides power supply.
Preferably, as shown in figure 3, primary current control chip further includes drive control subelement 112；
The input terminal of drive control subelement 112 is connected with 111 output end of electric current loop；
The output end of drive control subelement 112 is the output end of primary current drive control unit 101；
Drive control subelement 112 receives the comparison signal of electric current loop output, and according to the comparison signal output driving
The working condition of signal, the driving signal control switch pipe K reduces primary current I1 with the increase of load voltage Vout.
Preferably, as shown in figure 3, primary current sampling unit 102 includes 3rd resistor R3,3rd resistor R3 is sampling electricity
Resistance；
Primary side winding S1, switching tube K and 3rd resistor R3 are linked into the input power after being sequentially connected in series；
The other end of second resistance R2 is connected with the common end of switching tube K and 3rd resistor R3.
Preferably, as shown in figure 3, power cell is the first rectification subelement 211, to the output electricity of the first vice-side winding S2
After pressure carries out rectifying and wave-filtering, it is input to load.Removing ripple unit 202 includes: the second rectification subelement 221, DC/DC varitron list
Member 222 and Voltage loop control subelement 223；
The input terminal of second rectification subelement 221 is connected with the both ends of the second vice-side winding S3；
The output end of second rectification subelement 221 is connected with the input terminal of DC/DC transformation subelement 222；
The output end of DC/DC transformation subelement 222 is the output end of ripple unit 202；
The input terminal that Voltage loop controls subelement 223 converts the output end and power cell of subelement 222 with DC/DC respectively
201 output end is connected；
The output end of Voltage loop control subelement 223 is connected with the control terminal of DC/DC transformation subelement 222；
Voltage loop control subelement 223 is used to obtain the second sampled signal that characterization removes 202 output voltage V2 of ripple unit
VS2 obtains the ripple signal VFB of power cell 201, and removes ripple according to the second sampled signal VS2, ripple signal VFB control
The output ripple of unit 202 is contrary with the output ripple of power cell 201；It is so-called contrary to refer to working as power cell
When the real-time voltage of 201 outputs is higher than its average voltage, the real-time voltage for going ripple unit 202 to export is lower than its average voltage,
Therefore the ripple of the two can just cancel out each other, and the ripple in load reduces；Practical average voltage that is practical and loading is power
The sum of unit 201 and the average voltage for going ripple unit 202 to export.
In order to completely eliminate the ripple in load, while the ripple and function of the output voltage V2 of ripple unit 202 is removed in setting
The ripple of the output voltage V1 of rate unit 201 is contrary, equal in magnitude.The average voltage of ripple signal VFB determines line
The average voltage that wave unit 202 exports；The average voltage of ripple signal VFB by 201 output ripple Vpp of power cell peak-to-peak value
Size determine, relative to the variation of load voltage, 201 output ripple Vpp of power cell variation be slowly, so removing ripple
The average value of 202 output voltage of unit is almost unchanged.
Preferably, in order to which the average value for guaranteeing 202 output voltage of ripple unit is constant, Voltage loop control unit receive or
Built-in DC reference signal Vref, and according to the second sampled signal VS2, the ripple signal VFB and DC reference of power cell 201
Signal Vref control goes the output ripple of ripple unit 202 contrary with the output ripple of power cell 201.
Therefore, the average voltage for going ripple unit 202 to export does not change with load and is changed, and removes ripple unit 202
Output voltage V2 it is contrary, equal in magnitude with ripple and the ripple of output voltage V1 of power cell 201.When load becomes larger
When, the output voltage Vout of the primary current control driving circuit increases, then the output voltage V1 of power cell 201 is with negative
It carries the increase of voltage Vout and increases；At this point, the voltage on the first vice-side winding S2 and the second vice-side winding S3 can be with power
The output voltage V1 of unit 201 increases and increases, and load current Iout only variation of precision under primary current control,
It therefore is faint relative to the variation of load voltage Vout, so go the output power of ripple unit 202 constant, and it is inputted
Voltage (the as voltage of the second vice-side winding S3) increases, then its input current I3 reduces.
Transformer current relational expression is N1*I1=N2*I2+N3*I3；Wherein, N1, N2, N3 are respectively primary side winding S1,
The number of turns of one vice-side winding S2 and the second vice-side winding S3；I1, I2, I3 are to flow through primary side winding S1, the first vice-side winding respectively
Electric current on S2 and the second vice-side winding S3.Primary current control exists indeed through the peak steady of control primary current I1
A certain value, to realize that control output electric current Iout is constant, therefore under the control of primary current drive control unit 101, primary side
Electric current I1 is remained unchanged；And when loading increase, the reduction of the electric current I3 on the second vice-side winding S3 results in the first vice-side winding
The increase of electric current I2 on S2；When this shows load variation, load current can also change, and drive the primary current control
The output electric current Iout of dynamic circuit cannot be accurately stable in setting value.
Therefore need to inject a thermal compensation signal VF relevant to load voltage transformation to electric current loop 111, when load increases
When (load voltage Vout increase), control primary current I1 the first sampled signal VS1 it is smaller when the pipe that opens the light start to act, with this
Reduce primary current I1, counteracts the electric current of the first vice-side winding S2 caused by being reduced by the electric current I3 on the second vice-side winding S3
The incrementss of I2, therefore, the electric current I2 on the first vice-side winding S2 can remain unchanged, and improve load regulation with this.Similarly,
Load goes the output power of ripple unit 202 to be held essentially constant when lightening, and its input voltage (the second vice-side winding S3's
Voltage) reduce, then the electric current I3 on the second vice-side winding S3 is increased accordingly；The first sampling letter of corresponding control primary current I1
Number VS1 controls switching tube action when larger, increases primary current I1 with this, offsets and increased by the electric current I3 on the second vice-side winding S3
The reduction amount of the electric current I2 of first vice-side winding S2 caused by big, then the electric current I2 on the first vice-side winding S2 can be remained unchanged,
Load regulation is improved with this.
In another specific embodiment of the present invention, on the basis of Fig. 2, it is preferred that as shown in figure 3, DC/DC varitron
Unit 222 is buck circuit.
Preferably, as shown in figure 3, first rectification subelement 211 and second rectification subelement 221 include: diode D and
Capacitor C；
The anode of diode D is an input terminal of the rectification subelement where it；
The cathode of diode D is connected with one end of capacitor C；
The other end of capacitor C is another input terminal of the rectification subelement where it.
In addition, electric current loop 111 and Voltage loop control subelement 223 can use way of realization in the prior art, this
Place no longer repeats one by one.
In specific practical application, characterization goes the second sampled signal VS2 of 202 output voltage V2 of ripple unit can be from
The output end sampling of the output end namely buck circuit of ripple unit 202 is gone to obtain.
It is worth noting that making the output ripple and power list of ripple unit to reduce or eliminate load ripple
The output ripple of member is contrary, and Voltage loop control subelement 223 feedback signal VFB relevant to output ripple and can will be gone
The superposed signal (VFB+VS2) and DC reference signal of the second sampled signal VS2 of 202 output voltage V2 of ripple unit carries out
Vref compares (as shown in Figure 4), or can also will go the second sampled signal VS2 of 202 output voltage V2 of ripple unit with
(Vref-VFB) it is compared (as shown in Figure 5).Within the scope of protection of this application, its specific application environment can be regarded and
It is fixed.
Similarly, the reference edge of electric current loop 111, electric current base can also be acted on the positively related thermal compensation signal VF of load voltage
Calibration signal Viref believes compared with the difference (Viref-VF) of thermal compensation signal VF is as the first sampled signal VS1 of primary current I1
Number, so that primary current I1 reduces as load voltage Vout increases, it is constant thus to carry out stablizing for proof load electric current Iout.
Particularly, the primary current control driving circuit can also apply under conditions of light modulation, specific dimming mode
Similar with the prior art, details are not described herein again.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.
The above is only the preferred embodiment of the present invention, make skilled artisans appreciate that or realizing of the invention.It is right
A variety of modifications of these embodiments will be apparent to one skilled in the art, general original as defined herein
Reason can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will not
Be intended to be limited to the embodiments shown herein, and be to fit to it is consistent with the principles and novel features disclosed in this article most
Wide range.
Claims (10)
1. a kind of primary current controls driving circuit characterized by comprising transformer, primary circuit and secondary circuit；Its
In:
The transformer includes: primary side winding, the first vice-side winding and the second vice-side winding；
The primary circuit include: primary current drive control unit, primary current sampling unit, thermal compensation signal generate unit and
Switching tube；Input power is linked into after the primary side winding, switching tube and the series connection of primary current sampling unit；
The primary current sampling unit is used to obtain the first sampled signal of characterization primary current；
The thermal compensation signal generates unit for generating a thermal compensation signal relevant to load voltage；
The primary current drive control unit receives first sampled signal and the thermal compensation signal, and to received described
First sampled signal is compared with current reference signal, the switching tube is controlled according to comparison result, so that the primary side is electric
Stream is stablized in setting value, and then stablizes load current；The thermal compensation signal adjusts the setting value based on the received, so that institute
Load current is stated not change with the variation of load voltage；
The secondary circuit includes: the power cell being connected with first vice-side winding, and with second vice-side winding
Connected removes ripple unit；It is supplied after the output end of the power cell and the output end series connection for removing ripple unit for load
Electricity, the output ripple opposite in phase of the output ripple for removing ripple unit and the power cell.
2. primary current according to claim 1 controls driving circuit, which is characterized in that the thermal compensation signal generates unit
Including the tertiary winding, the tertiary winding is for obtaining and the positively related thermal compensation signal of the load voltage；The tertiary winding
Ground terminal be connected with the ground of the primary circuit.
3. primary current according to claim 2 controls driving circuit, which is characterized in that the thermal compensation signal generates unit
Further include: first resistor and second resistance；
One end of the first resistor is connected with the other end of the tertiary winding；
The other end of the first resistor is connected with one end of the second resistance, and the thermal compensation signal passes through the first resistor
Primary current drive control unit is input to the tie point of second resistance.
4. primary current according to claim 3 controls driving circuit, which is characterized in that the primary current sampling unit
Including 3rd resistor；
The primary side winding, switching tube and 3rd resistor are linked into the input power after being sequentially connected in series；
The other end of the second resistance is connected with the common end of the switching tube and 3rd resistor, first sampled signal and
Primary current driving control is input to by the tie point of the first resistor and the second resistance after the thermal compensation signal superposition
Unit processed.
5. primary current according to claim 2 controls driving circuit, which is characterized in that the tertiary winding be also used to for
The primary current drive control unit provides power supply.
6. primary current according to claim 1-5 controls driving circuit, which is characterized in that the power cell
For the first rectification subelement, the first rectification subelement carries out rectifying and wave-filtering to the output voltage of first vice-side winding.
7. primary current according to claim 6 controls driving circuit, which is characterized in that described to go the ripple unit to include:
Second rectification subelement, DC/DC transformation subelement and Voltage loop control subelement；
The input terminal of the second rectification subelement is connected with the both ends of second vice-side winding；
The output end of the second rectification subelement is connected with the input terminal of DC/DC transformation subelement；
The output end of the DC/DC transformation subelement is the output end for removing ripple unit；
The input terminal of the Voltage loop control subelement converts the output end and the power list of subelement with the DC/DC respectively
The output end of member is connected；
The output end of the Voltage loop control subelement is connected with the control terminal of DC/DC transformation subelement；
The Voltage loop control subelement is used to obtain the second sampled signal and the institute for removing ripple unit output voltage described in characterization
The ripple signal of power cell is stated, and is gone according to the control of the ripple signal of second sampled signal and the power cell
The output ripple of ripple unit is contrary with the output ripple of the power cell.
8. primary current according to claim 7 controls driving circuit, which is characterized in that the Voltage loop controls subelement
It is constant to be also used to control the average voltage for going ripple unit to export.
9. primary current according to claim 8 controls driving circuit, which is characterized in that the DC/DC converts subelement
For buck circuit.
10. primary current according to claim 7 controls driving circuit, which is characterized in that the first rectification subelement
It include: diode and capacitor with the second rectification subelement；
The anode of the diode is an input terminal of the rectification subelement where it；
The cathode of the diode is connected with one end of the capacitor；
The other end of the capacitor is rectification subelement another input terminal where it.
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| CN201610398181.7A CN105958825B (en) | 2016-06-07 | 2016-06-07 | A kind of primary current control driving circuit |
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| CN201610398181.7A CN105958825B (en) | 2016-06-07 | 2016-06-07 | A kind of primary current control driving circuit |
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| CN107947586B (en) * | 2017-11-07 | 2024-06-04 | 陕西亚成微电子股份有限公司 | Switching power supply quick response control circuit and control method |
| CN110504826B (en) * | 2018-05-18 | 2020-10-27 | 华润矽威科技（上海）有限公司 | LED driving system, ripple removing 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| TWI425749B (en) * | 2010-03-17 | 2014-02-01 | Noveltek Semiconductor Corp | Primary side current controller and related power supply |
| US8599581B2 (en) * | 2012-02-16 | 2013-12-03 | Fremont Micro Devices (Sz) Limited | Primary-side regulated modulation controller with improved transient response and audile noise |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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