CN101795077A - A kind of device of control change device output current voltage response - Google Patents
A kind of device of control change device output current voltage response Download PDFInfo
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Abstract
The device of control change device output current voltage response provided by the invention comprises: secondary output voltage sampling unit, current operator unit, multiplier and control unit; Secondary output voltage sampling unit is used for the secondary output voltage is sampled; The current operator unit is used for calculating current signal according to the voltage signal of secondary output voltage sampling unit sampling and the linear relationship of secondary output voltage and output current; Multiplier, being used for voltage signal and current signal multiplied each other calculates control signal; Control unit is used for being controlled by control signal the switching frequency of the switching tube on former limit, and switching frequency is directly proportional with control signal.The present invention realizes characteristic control by the internal structure that changes the PWM controller on existing basis, do not need the external circuit of PWM controller is improved, do not need to increase other devices yet, simplified circuit structure like this, reduced the cost of whole converter.
Description
Technical field
The present invention relates to Switching Power Supply control technology field, particularly a kind of device of control change device output current voltage response.
Background technology
Generally, in common battery charger and adapter, in order to guarantee under low output voltage, keep a constant output current, the characteristic curve of its output current-voltage is the flip vertical design, referring to shown in Figure 1.The characteristics of the output current-voltage response of this flip vertical are to have identical output current when different output voltages.The control method that realizes constant current output in the prior art comprises secondary control and the control of former limit.Because the control of former limit has very high cost performance than secondary control, therefore major part adopts the control of former limit.
Referring to Fig. 2 a and Fig. 2 b of limit, prior art Central Plains control, wherein, Fig. 2 a is the converter circuit figure of limit, prior art Central Plains control, and Fig. 2 b is the cut-away view of PWM controller among Fig. 2 a.Voltage detection module 201 comprises transformer and divider resistance, is used to detect the output voltage of secondary, and the output voltage of secondary is obtained indirectly by auxiliary winding, and the output voltage of detection feeds back to the FB end of PWM controller 202.Shown in Fig. 2 b, the output voltage of detection carries out exporting to constant-voltage controller 203 after computing is amplified through amplifier module 202, the final control signal that produces the former limit of control switching tube, and control signal is by the output of OUT end.
The principle that realizes the constant output Current Control at present is to become certain relation to realize with secondary conducting duty ratio according to former limit peak current, is used for realizing the constant output electric current as constant-current controller among Fig. 2 b 204 and former limit peak current detection module 205.Converter is operated under discontinuous conduction mode DCM (Discontinue Current Mode) or the discontinuous work critical conduction mode DCMB (DiscontinueCurrent Mode Boundary), output current is that the average current of secondary is main relevant with secondary conducting duty ratio with former limit peak current, so satisfy the requirement of constant output electric current, only need to keep constant the getting final product of product of secondary conducting duty ratio and former limit peak current.
But, still need a big current work when some loads on low output voltage, and the low more output current of output voltage is big more.Under low output voltage, realize the output current voltage characteristic curve of big electric current output as shown in Figure 3.Wherein, curve 1 is output current-voltage response, and curve 2 is output current-power characteristics.
Realize the most of peak current or the secondary conducting duty ratio that changes former limit that adopt of characteristic curve of the output current-voltage of curve 1 shown in Figure 3 at present, the voltage signal that predetermined ratio is arranged according to different output voltages or with output voltage changes the peak current or the secondary conducting duty ratio on former limit by PWM controller periphery circuit, to realize the slope of different output current-voltage responses.But, realize that by PWM controller periphery circuit the mode of this inclination output current-voltage response can increase the system device number, thereby increase cost, and this mode can not realize that accurately sampling realizes a linear curve of output.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of device of control change device output current voltage response, can realize realizing under the low output voltage characteristic curve of big electric current output.
The bright device that a kind of control change device output current voltage response is provided of this law comprises: secondary output voltage sampling unit, current operator unit, multiplier and control unit;
Described secondary output voltage sampling unit is used for the secondary output voltage is sampled;
Described current operator unit is used for calculating current signal according to the voltage signal of described secondary output voltage sampling unit sampling and the linear relationship of secondary output voltage and output current;
Described multiplier, being used for described voltage signal and current signal multiplied each other calculates control signal;
Described control unit is used for being controlled by described control signal the switching frequency of the switching tube on former limit, and described switching frequency is directly proportional with described control signal.
Preferably, described secondary output voltage sampling unit comprises first sampling resistor and second sampling resistor;
By described first sampling resistor and the second sampling resistor ground connection of series connection, described first sampling resistor is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of second sampling resistor successively.
Preferably, described current operator unit comprises first amplifier, first resistance and second resistance;
The positive input terminal of first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of first amplifier by second resistance, and the output of first amplifier connects the negative input end of first amplifier by first resistance; The output of first amplifier connects the input of described multiplier.
Preferably, described control unit comprises mirror current source, adjustable resistance, electric capacity, switch, preset reference power supply and comparator;
The output of multiplier connects the first input end of described mirror current source, and second input of mirror current source is by adjustable resistance ground connection;
First output head grounding of mirror current source, second output connects the negative input end of comparator;
The positive input terminal of comparator is by the preset reference power ground, and the positive pole of preset reference power supply connects the positive input terminal of comparator, minus earth;
Electric capacity connects the negative input end of comparator, and switch connects the negative input end of comparator;
The output signal of comparator is as the output signal of The whole control unit.
Preferably, also comprise sample holding unit, described sample holding unit is used for the voltage of secondary output voltage sampling unit sampling sampled and sends to described current operator unit after keeping.
Preferably, described secondary output voltage sampling unit comprises first diode and first electric capacity;
By described first diode and first capacity earth of series connection, described first diode is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of first electric capacity successively.
The present invention also provides a kind of device of control change device output current voltage response, comprising: secondary output voltage sampling unit, current operator unit, multiplier, former limit peak current control unit, constant-current controller and constant-voltage controller;
Described secondary output voltage sampling unit is used for the secondary output voltage is sampled;
Described current operator unit is used for calculating current signal according to the voltage signal of described secondary output voltage sampling unit sampling and the linear relationship of secondary output voltage and output current;
Described multiplier, being used for described voltage signal and current signal multiplied each other calculates control signal;
Described former limit peak current control unit is used for obtaining second control signal according to described control signal and former limit peak current sampled signal, and described second control signal is sent to described constant-current controller and constant-voltage controller respectively;
Described constant-voltage controller is used for determining according to described second control signal ON time on former limit, changes the switch periods on former limit according to the voltage signal of sampling, to realize the characteristic of constant output voltage;
Described constant-current controller is used for determining according to described second control signal ON time on former limit, realizes the characteristic of constant output electric current according to the relation of default secondary conducting duty ratio.
Preferably, described current operator unit comprises first amplifier, first resistance and second resistance;
The positive input terminal of first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of first amplifier by second resistance, and the output of first amplifier connects the negative input end of first amplifier by first resistance; The output of first amplifier connects the input of described multiplier.
Preferably, described control unit comprises mirror current source, adjustable resistance, electric capacity, switch, preset reference power supply and comparator;
The output of multiplier connects the first input end of described mirror current source, and second input of mirror current source is by adjustable resistance ground connection;
First output head grounding of mirror current source, second output connects the negative input end of comparator;
The positive input terminal of comparator is by the preset reference power ground;
Electric capacity connects the negative input end of comparator, and switch connects the negative input end of comparator;
The output signal of comparator is as the output signal of The whole control unit.
Preferably, described secondary output voltage sampling unit comprises first sampling resistor and second sampling resistor;
By described first sampling resistor and the second sampling resistor ground connection of series connection, described first sampling resistor is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of second sampling resistor successively;
Or,
Described secondary output voltage sampling unit comprises first diode and first electric capacity;
By described first diode and first capacity earth of series connection, described first diode is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of first electric capacity successively.
Compared with prior art, the present invention has the following advantages:
This device is realized the control of output current voltage response by the inner switching frequency that changes former limit peak current or switching tube of PWM controller.Because power output is the product of output current and output voltage, and power output only has linear relationship with these two parameters of switching frequency of former limit peak current and switching tube, therefore, the present invention realizes characteristic control by the internal structure that changes the PWM controller on existing basis, do not need the external circuit of PWM controller is improved, do not need to increase other devices yet, simplified circuit structure like this, reduced the cost of whole converter.
Description of drawings
Fig. 1 is a converter output current voltage flip vertical performance diagram in the prior art;
Fig. 2 a is the converter circuit figure that Switching Power Supply adopts the control of former limit in the prior art;
The cut-away view of PWM controller among Fig. 2 b Fig. 2 a;
Fig. 3 is the converter output current voltage characteristic curve that the present invention will realize;
Fig. 4 is embodiment one structure chart provided by the invention;
Fig. 5 is another example structure figure provided by the invention;
Fig. 6 is the cut-away view of the current operator unit among Fig. 4 and Fig. 5;
Fig. 7 is the cut-away view of the control unit among Fig. 4 and Fig. 5;
Fig. 8 is another example structure figure provided by the invention;
Fig. 9 is another example structure figure provided by the invention;
Figure 10 is the curve chart between former limit peak current, output current and the control signal;
Figure 11 is the system diagram of the converter that provides of the embodiment of the invention.
Embodiment
In order to make those skilled in the art understand and to implement technical scheme of the present invention better, introduce basic principle of the present invention below in conjunction with Fig. 3.
The characteristics of curve 1 shown in Figure 3 are: as output current Io during less than first electric current I 1, it is constant that output voltage V o keeps.As output current Io during greater than first electric current I 1, along with the increase gradually of output current Io, output voltage V o reduces gradually.
The characteristics of curve 2 shown in Figure 3 are: as output current Io during less than first electric current I 1, power output Po is linear to rise; As output current Io during greater than first electric current I 1, power output Po presents nonlinear change, and the output current Io of peak power output Po correspondence is not first electric current I 1.
As output current Io during greater than first electric current I 1, the slope of output voltage V o and output current Io can be represented with following formula (1):
Wherein (Io1, Vo1) and (Io2 Vo2) is respectively the electric current and the voltage of first sampled point and second sampled point.Formula (1) can be reduced to formula (2):
The power output of coincidence formula (2) can be represented with formula (3):
By formula (3) as can be seen, between power output Po and the output voltage V o not dull linear relationship.
The power output of converter and switching frequency have the linear relationship of formula (4):
Wherein, ipk is the peak current on former limit, and Lm is a former limit magnetizing inductance, and fs is the switching frequency of converter, and η is the operating efficiency of converter.Because Lm and η are definite values, therefore, converter is no matter under the DCM pattern, or under the DCMB pattern, the peak current ipk on power output and former limit and the switching frequency fs of converter are linear.
Because the characteristic curve of power output and output current is not dull linear relationship, therefore can realize the output circuit shown in the curve 1 and the characteristic curve of voltage by the control power output.Because power output and former limit peak current and switching frequency have relation, therefore, can realize the control of power output by these two parameters of control, introduce respectively below by changing former limit peak current and realize power output control and realize the control method of power output by changing switching frequency.
Switching frequency by the change switching tube provided by the invention realizes that the device of control change device output current voltage response comprises: secondary output voltage sampling unit, current operator unit, multiplier and control unit;
Described secondary output voltage sampling unit is used for the secondary output voltage is sampled;
Described current operator unit is used for calculating according to the linear relationship of the voltage signal of described secondary output voltage sampling unit sampling and secondary output voltage and output current the equivalent signal of output current;
Described multiplier is used for equivalent signal with described voltage signal and output current and multiplies each other and calculate control signal;
Described control unit is used for being controlled by described control signal the switching frequency of the switching tube on former limit, and described switching frequency is directly proportional with described control signal.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 4, this figure is embodiment one structure chart provided by the invention.
The method of control output current-output voltage characteristic curve that present embodiment provides is to realize by the switching frequency that changes switching tube.
Present embodiment comprises secondary output voltage sampling unit 401, sample holding unit 402, current operator unit 403, multiplier 404, control unit 405, constant-current controller 406, constant-voltage controller 407, NOR gate 409 and driver element 410.
Secondary output voltage sampling unit 401 is used for the secondary output voltage is sampled, and the voltage signal of sampling is sent to sample holding unit 402.
Need to prove that the secondary output voltage sampling unit 401 that present embodiment provides is made up of two sampling resistors, is respectively the first sampling resistor Rfb1 and the second sampling resistor Rfb2.The output voltage of secondary winding is obtained indirectly by auxiliary winding.The different name end of auxiliary winding is the first sampling resistor Rfb1 and the second sampling resistor Rfb2 ground connection by connecting successively, the common port of the described first sampling resistor Rfb1 and the second sampling resistor Rfb2 is connected the input of described current operator unit 403, and wherein the voltage on the second sampling resistor Rfb2 is as the input voltage signal of sample holding unit 402.
The present invention also provides a kind of secondary output voltage sampling unit 501, and as shown in Figure 5, this secondary output voltage sampling unit 501 comprises the first diode D1 and first capacitor C 1.By the first diode D1 and first capacitor C, 1 ground connection of series connection, wherein the voltage on first capacitor C 1 is as the input voltage signal of sample holding unit 402 successively for the different name end of auxiliary winding.
Sample holding unit 402 is used for the maintenance of sampling of described voltage signal, and the voltage signal that will sample after keeping sends to current operator unit 403.
Described default reference voltage is provided by voltage VDD.
Represent control signal with Vc, then
Wherein Kv is a predetermined ratio.
Need to prove that control signal is a pulse signal, the frequency of pulse signal has determined the switching frequency of switching tube.
Below simple constant-current controller 406, constant-voltage controller 407, NOR gate 409 and the driver element 410 down introduced.
Wherein, constant-current controller 406 is in order to realize the control of constant current, and constant-voltage controller 407 is in order to realize the control of constant voltage, i.e. the part of constant voltage in the curve 1 among Fig. 3.Also can realize having only constant voltage output in this embodiment by the setting of system parameters and have the curve of slope characteristics to export, the constant current output will cut little ice; Also can realize constant voltage, have output of slope characteristics curve and constant current to export three specific character curves, the constant current part will occur at maximum current minimum voltage point, realize the output characteristic of constant maximum current.
NOR gate 409 be with the output signal of constant-current controller 406, constant-voltage controller 407 and control unit 405 carry out with non-after send to driver element 410.
The device of the control change device output current voltage response that present embodiment provides is to realize by the switching frequency that changes switching tube, this device only need improve the internal structure of PWM controller and get final product, do not need by changing the periphery circuit of PWM controller, can reduce device like this, reduce cost.
Introduce the internal structure of current operator unit below in conjunction with Fig. 6.
The current operator unit comprises the first amplifier A, first resistance R 1 and second resistance R 2, wherein the positive input terminal of the first amplifier A connects described default reference voltage CCref, the output of sample holding unit is by the negative input end of second resistance R, 2 connections, the first amplifier A, and the output of the first amplifier A connects the negative input end of the first amplifier A by first resistance R 1.The output signal Vi of the first amplifier A is as an input signal of multiplier.
Introduce the internal structure of control unit in detail below in conjunction with Fig. 7.
The input signal of control unit is control signal Vc, and control signal Vc connects the first input end of mirror current source 701, and second input of mirror current source 701 is by adjustable resistance Rc ground connection.
First output head grounding of mirror current source 701, second output connects the negative input end of comparator B.
The positive input terminal of comparator B is by preset reference power supply Vf ground connection, and the positive pole of preset reference power supply Vf connects the positive input terminal of comparator B, minus earth.
Capacitor C c connects the negative input end of comparator B, and switch S c connects the negative input end of comparator B.
The output of comparator B is as the output signal of The whole control unit, promptly as an input signal of NOR gate among Fig. 5 409.
In addition, the output of constant-current controller 406 and constant-voltage controller 407 is also as the input signal of NOR gate 409.
Control signal Vc is converted to the adjustable current signal after through an adjustable resistance Rc, the adjustable current signal is through charging for capacitor C c after Kc:1 mirror current source 701 mirror images, when the voltage on the capacitor C c reaches preset reference power supply Vf, the switching tube closure, this moment, switch S c was also closed, capacitor C c finishes discharge in the extremely short time, carry out the control of new one-period then according to control signal Vc.Need to prove that the control signal of control unit output is a pulse control signal, as shown in Figure 7.
The device of above embodiment introduction is to realize output current-output voltage characteristic curve controlled by the switching frequency that changes switching tube, and the following examples will be introduced the control that realizes output current-output voltage characteristic curve by the peak current that changes former limit.
Referring to Fig. 8, this figure is another example structure figure provided by the invention.
The identical of the device that the embodiment that the device that present embodiment provides and Fig. 4 are corresponding provides is: secondary output voltage sampling unit, sample holding unit, current operator unit and multiplier, therefore, the function of these unit and annexation will repeat no more at this.
The difference of the embodiment that present embodiment is corresponding with Fig. 4 is a former limit peak current control unit, and former limit peak current control unit sends to constant-current controller and constant-voltage controller respectively with the control signal of output.
Described former limit peak current control unit is used for obtaining second control signal according to described control signal and former limit peak current sampled signal, and described second control signal is sent to described constant-current controller and constant-voltage controller respectively.
Need to prove that former limit peak current sampled signal is the voltage signal on the resistance R cs among the figure, characterizes former limit peak current with voltage signal.The emitter of switching tube is by resistance R cs ground connection.
Described constant-voltage controller is used for determining according to described second control signal ON time on former limit, changes the switch periods on former limit according to the voltage signal of sampling, to realize the characteristic of constant output voltage;
Described constant-current controller is used for determining according to described second control signal ON time on former limit, realizes the characteristic of constant output electric current according to the relation of default secondary conducting duty ratio.
The effect of former limit peak current control unit is that former limit peak current is reduced along with reducing of control signal Vc.
Wherein, constant-voltage controller is used for regulating according to the control signal that former limit peak current control unit sends the service time on former limit, and utilizes the secondary output voltage of sampling to realize constant voltage output control; Constant-current controller is used for the size that control signal that sends according to former limit peak current control unit and the secondary conducting duty of presetting are recently regulated the constant output electric current.
Embodiment at Fig. 5 correspondence, realize that by changing former limit peak current the embodiment of output current-output voltage characteristic curve also can adopt secondary output voltage sampling unit shown in Figure 5, as shown in Figure 9, the operation principle of other parts is identical with Fig. 8, does not repeat them here.
Relation between the control signal Vc of output current Io, former limit peak current Ipk among Fig. 8 embodiment corresponding and multiplier output with Fig. 9 as shown in figure 10, as can be seen from Figure 10 former limit peak current Ipk reduces and reduces with control signal Vc's.
Introduce the structure of the PWM controller outside of above all embodiment correspondences below.
Referring to Figure 11, this figure is the system construction drawing of converter of the embodiment of Fig. 4, Fig. 5, Fig. 8 and Fig. 9 correspondence.
Wherein, Rcs, Rfb1 and Rfb2 have done introduction in above embodiment, do not repeat them here.
The different name end of auxiliary winding is by the VCC of second diode D2 connection PWM controller, and simultaneously, the VCC of PWM end is by second capacitor C, 2 ground connection.The second diode D2 and second capacitor C 2 are formed the rectifying and wave-filtering network, and auxiliary winding provides power supply by the rectifying and wave-filtering network for the PWM controller.
The Rc end of PWM controller is by resistance 120 ground connection.Resistance 120 is used to be provided with inclination output current-output voltage characteristic slope of a curve, and the realization slope can be regulated by PWM controller outside.
The device that present embodiment provides is by changing the internal structure of PWM controller, realize the control of output current voltage response by the size of controlling former limit peak current, this device does not need to increase the external devices of PWM controller yet, simplify the structure like this, reduced the cost of whole converter.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. the device of a control change device output current voltage response is characterized in that, comprising: secondary output voltage sampling unit, current operator unit, multiplier and control unit;
Described secondary output voltage sampling unit is used for the secondary output voltage is sampled;
Described current operator unit is used for calculating current signal according to the voltage signal of described secondary output voltage sampling unit sampling and the linear relationship of secondary output voltage and output current;
Described multiplier, being used for described voltage signal and current signal multiplied each other calculates control signal;
Described control unit is used for being controlled by described control signal the switching frequency of the switching tube on former limit, and described switching frequency is directly proportional with described control signal.
2. the device of control change device output current voltage response according to claim 1 is characterized in that, described secondary output voltage sampling unit comprises first sampling resistor and second sampling resistor;
By described first sampling resistor and the second sampling resistor ground connection of series connection, described first sampling resistor is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of second sampling resistor successively.
3. the device of control change device output current voltage response according to claim 1 is characterized in that described current operator unit comprises first amplifier, first resistance and second resistance;
The positive input terminal of first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of first amplifier by second resistance, and the output of first amplifier connects the negative input end of first amplifier by first resistance; The output of first amplifier connects the input of described multiplier.
4. the device of control change device output current voltage response according to claim 1 is characterized in that described control unit comprises mirror current source, adjustable resistance, electric capacity, switch, preset reference current potential and comparator;
The output of multiplier connects the first input end of described mirror current source, and second input of mirror current source is by adjustable resistance ground connection;
First output head grounding of mirror current source, second output connects the negative input end of comparator;
The positive input terminal of comparator is by preset reference current potential ground connection, and the positive pole of preset reference current potential connects the positive input terminal of comparator, minus earth;
Electric capacity connects the negative input end of comparator, and switch connects the negative input end of comparator;
The output signal of comparator is as the output signal of The whole control unit.
5. the device of control change device output current voltage response according to claim 1, it is characterized in that, also comprise sample holding unit, described sample holding unit is used for the voltage of secondary output voltage sampling unit sampling sampled and sends to described current operator unit after keeping.
6. the device of control change device output current voltage response according to claim 1 is characterized in that, described secondary output voltage sampling unit comprises first diode and first electric capacity;
By described first diode and first capacity earth of series connection, described first diode is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of first electric capacity successively.
7. the device of a control change device output current voltage response is characterized in that, comprising: secondary output voltage sampling unit, current operator unit, multiplier, former limit peak current control unit, constant-current controller and constant-voltage controller;
Described secondary output voltage sampling unit is used for the secondary output voltage is sampled;
Described current operator unit is used for calculating current signal according to the voltage signal of described secondary output voltage sampling unit sampling and the linear relationship of secondary output voltage and output current;
Described multiplier, being used for described voltage signal and current signal multiplied each other calculates control signal;
Described former limit peak current control unit is used for obtaining second control signal according to described control signal and former limit peak current sampled signal, and described second control signal is sent to described constant-current controller and constant-voltage controller respectively;
Described constant-voltage controller is used for determining according to described second control signal ON time on former limit, changes the switch periods on former limit according to the voltage signal of sampling, to realize the characteristic of constant output voltage;
Described constant-current controller is used for determining according to described second control signal ON time on former limit, realizes the characteristic of constant output electric current according to the relation of default secondary conducting duty ratio.
8. the device of control change device output current voltage response according to claim 7 is characterized in that described current operator unit comprises first amplifier, first resistance and second resistance;
The positive input terminal of first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of first amplifier by second resistance, and the output of first amplifier connects the negative input end of first amplifier by first resistance; The output of first amplifier connects the input of described multiplier.
9. the device of control change device output current voltage response according to claim 7 is characterized in that described control unit comprises mirror current source, adjustable resistance, electric capacity, switch, preset reference current potential and comparator;
The output of multiplier connects the first input end of described mirror current source, and second input of mirror current source is by adjustable resistance ground connection;
First output head grounding of mirror current source, second output connects the negative input end of comparator;
The positive input terminal of comparator is by the preset reference power ground;
Electric capacity connects the negative input end of comparator, and switch connects the negative input end of comparator;
The output signal of comparator is as the output signal of The whole control unit.
10. the device of control change device output current voltage response according to claim 7 is characterized in that, described secondary output voltage sampling unit comprises first sampling resistor and second sampling resistor;
By described first sampling resistor and the second sampling resistor ground connection of series connection, described first sampling resistor is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of second sampling resistor successively;
Or,
Described secondary output voltage sampling unit comprises first diode and first electric capacity;
By described first diode and first capacity earth of series connection, described first diode is connected the input of described current operator unit to the different name end of auxiliary winding with the common port of first electric capacity successively.
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| CN102427300A (en) * | 2011-10-10 | 2012-04-25 | 浙江大学 | Control method and controller for output voltage of AC-DC (alternating current-direct current) converter |
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| CN103246302A (en) * | 2012-02-03 | 2013-08-14 | 上海占空比电子科技有限公司 | Output current sampling and constant output current control method |
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| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN111200365A (en) * | 2020-03-02 | 2020-05-26 | 上海南芯半导体科技有限公司 | Control method and control circuit of flyback converter |
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| CN102427300A (en) * | 2011-10-10 | 2012-04-25 | 浙江大学 | Control method and controller for output voltage of AC-DC (alternating current-direct current) converter |
| CN102427300B (en) * | 2011-10-10 | 2013-10-02 | 浙江大学 | Control method and controller for output voltage of AC-DC (alternating current-direct current) converter |
| CN103246302A (en) * | 2012-02-03 | 2013-08-14 | 上海占空比电子科技有限公司 | Output current sampling and constant output current control method |
| CN103246302B (en) * | 2012-02-03 | 2015-12-16 | 上海占空比电子科技有限公司 | A kind of output current sampling and constant output current control circuit and method |
| CN103580491A (en) * | 2012-07-12 | 2014-02-12 | 艾沃特有限公司 | Configurable power controller with combination input |
| CN103580491B (en) * | 2012-07-12 | 2016-04-13 | 戴乐格半导体公司 | There is the configurable power controller of combinatorial input |
| CN102801340A (en) * | 2012-08-20 | 2012-11-28 | 浙江大学 | Control method and controller for AC-DC converter |
| CN102801340B (en) * | 2012-08-20 | 2014-07-02 | 浙江大学 | Control method and controller for AC-DC converter |
| CN105897015A (en) * | 2016-06-13 | 2016-08-24 | 西安电子科技大学昆山创新研究院 | PSR constant-current constant-voltage AC/DC chip |
| CN108781034A (en) * | 2016-07-19 | 2018-11-09 | 密克罗奇普技术公司 | controlled adaptive power limiter |
| US10763747B2 (en) | 2016-07-19 | 2020-09-01 | Microchip Technology Incorporated | Controlled adaptive power limiter |
| CN108781034B (en) * | 2016-07-19 | 2021-03-16 | 密克罗奇普技术公司 | Controlled adaptive power limiter |
| CN107196272A (en) * | 2017-07-07 | 2017-09-22 | 成都启臣微电子股份有限公司 | A kind of continuous protection device of Switching Power Supply armature winding peak point current depth |
| CN107196272B (en) * | 2017-07-07 | 2018-12-07 | 成都启臣微电子股份有限公司 | A kind of continuous protective device of Switching Power Supply armature winding peak point current depth |
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN111200365A (en) * | 2020-03-02 | 2020-05-26 | 上海南芯半导体科技有限公司 | Control method and control circuit of flyback converter |
| CN111200365B (en) * | 2020-03-02 | 2021-07-09 | 上海南芯半导体科技有限公司 | Control method and control circuit of flyback converter |
| CN113630010A (en) * | 2020-05-06 | 2021-11-09 | 上海芯熠微电子有限公司 | Primary side control AC-DC converter output current and voltage characteristic curve device |
| CN113630010B (en) * | 2020-05-06 | 2024-07-12 | 上海芯熠微电子有限公司 | Device for controlling output current voltage characteristic curve of AC-DC converter by primary side |
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