CN101795077B - Device for controlling convertor to output current-voltage characteristic curve - Google Patents
Device for controlling convertor to output current-voltage characteristic curve Download PDFInfo
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Abstract
The invention provides a device for controlling a convertor to output a current-voltage characteristic curve, which comprises a secondary output voltage sampling unit, a current computing unit, a multiplying unit and a control unit; the secondary output voltage sampling unit is used for sampling secondary output voltage; the current computing unit is used for computing a current signal according to the voltage signal sampled by the secondary output voltage sampling unit and the linear relationship between the secondary output voltage and the secondary output current; the multiplying unit is used for computing a control signal through multiplying the voltage signal by the current signal; and the control unit is used for controlling the switching frequency of a primary switch tube by the control signal, wherein the switching frequency is in proportion to the control signal. In the invention, the characteristic curve is controlled by changing the inner structure of the PWM controller on the current basis, and does not need to improve the external circuit of the PWM controller and add other devices, thus simplifying the circuit structure and lowering the cost of the whole convertor.
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, and for detection of the output voltage of secondary, 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 behind the operation amplifier 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 at present constant output current control is to become certain relation to realize with secondary conducting duty ratio according to former limit peak current, is used for realizing constant output current such as the constant-current controller 204 among Fig. 2 b 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 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 large current work when some loads on low output voltage, and the lower output current of output voltage is larger.Under low output voltage, realize as shown in Figure 3 the output current voltage characteristic curve of High-current output.Wherein, curve 1 is output current-voltage response, and curve 2 is output current-power characteristics.
Realize at present 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, the voltage signal that predetermined ratio is arranged according to different output voltages or with output voltage changes 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 inclined output current-voltage characteristic curve 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 High-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, for the switching frequency of being controlled the switching tube on former limit by described control signal, described switching frequency is directly proportional with described control signal.
Preferably, described secondary output voltage sampling unit comprises the first sampling resistor and the second sampling resistor;
The different name end of auxiliary winding is described the first sampling resistor and the second sampling resistor ground connection by series connection successively, described the first sampling resistor be connected the common port of sampling resistor and connect the input of described current operator unit.
Preferably, described current operator unit comprises the first amplifier, the first resistance and the second resistance;
The positive input terminal of the first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of the first amplifier by the second resistance, and the output of the first amplifier connects the negative input end of the first amplifier by the first resistance; The output of the 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 the second input of mirror current source is by adjustable resistance ground connection;
The first output head grounding of mirror current source, the 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 whole control unit.
Preferably, also comprise sample holding unit, described sample holding unit sends to described current operator unit after keeping for the voltage of secondary output voltage sampling unit sampling is sampled.
Preferably, described secondary output voltage sampling unit comprises the first diode and the first electric capacity;
The different name end of auxiliary winding is described the first diode and the first capacity earth by series connection successively, described the first diode be connected the common port of electric capacity and connect the input of described current operator unit.
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 the second control signal according to described control signal and former limit peak current sampled signal, and described the second control signal is sent to respectively described constant-current controller and constant-voltage controller;
Described constant-voltage controller is used for determining according to described the second control signal the 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 for the ON time that determines former limit according to described the second control signal, is realized the characteristic of constant output current according to the relation of default secondary conducting duty ratio.
Preferably, described current operator unit comprises the first amplifier, the first resistance and the second resistance;
The positive input terminal of the first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of the first amplifier by the second resistance, and the output of the first amplifier connects the negative input end of the first amplifier by the first resistance; The output of the 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 the second input of mirror current source is by adjustable resistance ground connection;
The first output head grounding of mirror current source, the 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 whole control unit.
Preferably, described secondary output voltage sampling unit comprises the first sampling resistor and the second sampling resistor;
The different name end of auxiliary winding is described the first sampling resistor and the second sampling resistor ground connection by series connection successively, described the first sampling resistor be connected the common port of sampling resistor and connect the input of described current operator unit;
Or,
Described secondary output voltage sampling unit comprises the first diode and the first electric capacity;
The different name end of auxiliary winding is described the first diode and the first capacity earth by series connection successively, described the first diode be connected the common port of electric capacity and connect the input of described current operator unit.
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 like this circuit structure, reduced the cost of whole converter.
Description of drawings
Fig. 1 is 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 better and to implement technical scheme of the present invention, 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 the first electric current I 1, it is constant that output voltage V o keeps.As output current Io during greater than the first electric current I 1, along with the gradually increase 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 the first electric current I 1, power output Po is linear to rise; As output current Io during greater than the first electric current I 1, power output Po presents nonlinear change, and output current Io corresponding to peak power output Po is not the first electric current I 1.
As output current Io during greater than the first electric current I 1, the slope of output voltage V o and output current Io can represent with following formula (1):
Wherein (Io1, Vo1) and (Io2, Vo2) is respectively electric current and the voltage of the first sampled point and the second sampled point.Formula (1) can be reduced to formula (2):
The power output of coincidence formula (2) can represent with formula (3):
Can be found out by formula (3), be not dull linear relationship between power output Po and the output voltage V o.
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 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 by these two parameters of control the control of power output, the below introduces respectively the control method that realizes output power and realize power output by changing switching frequency by changing former limit peak current.
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, for the switching frequency of being controlled the switching tube on former limit by described control signal, 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, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Referring to Fig. 4, this figure is embodiment one structure chart provided by the invention.
The method of the control output current that present embodiment provides-output voltage characteristic curve 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 comprised 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, described the first sampling resistor Rfb1 be connected the common port of sampling resistor Rfb2 and connect the input of described current operator unit 403, 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 the first capacitor C 1.By the first diode D1 and the first capacitor C 1 ground connection of series connection, wherein the voltage on the 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, for maintenance that described voltage signal is sampled, 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 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 lower constant-current controller 406, constant-voltage controller 407, NOR gate 409 and the driver element 410 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 only having in this embodiment constant voltage output 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 the 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 to 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, the first resistance R 1 and the 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 the 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 the first resistance R 1.The output signal Vi of the first amplifier A is as an input signal of multiplier.
Introduce in detail the internal structure of control unit 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 the second input of mirror current source 701 is by adjustable resistance Rc ground connection.
The first output head grounding of mirror current source 701, the 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 whole control unit, namely 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, switching tube is closed, this moment, switch S c was also closed, capacitor C c finishes discharge within the extremely short time, then carry out the control of new one-period according to control signal Vc.Need to prove that the control signal of control unit output is 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 former limit peak current control unit, and former limit peak current control unit sends to respectively constant-current controller and constant-voltage controller with the control signal of output.
Described former limit peak current control unit is used for obtaining the second control signal according to described control signal and former limit peak current sampled signal, and described the second control signal is sent to respectively described constant-current controller and constant-voltage controller.
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 the second control signal the 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 for the ON time that determines former limit according to described the second control signal, is realized the characteristic of constant output 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 recently regulating constant size of deciding output current of the control signal that sends according to former limit peak current control unit and default secondary conducting duty.
For embodiment corresponding to Fig. 5, the embodiment that realizes output current-output voltage characteristic curve by changing former limit peak current 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, the former limit peak current Ipk among Fig. 8 embodiment corresponding with Fig. 9 and multiplier output as shown in figure 10, as can be seen from Figure 10 former limit peak current Ipk reducing and reduce with control signal Vc.
The below introduces the structure of PWM controller outside corresponding to above all embodiment.
Referring to Figure 11, this figure is the system construction drawing of the converter of embodiment corresponding to Fig. 4, Fig. 5, Fig. 8 and Fig. 9.
Wherein, Rcs, Rfb1 and Rfb2 have been introduced in above embodiment, do not repeat them here.
The different name end of auxiliary winding is by the VCC of the second diode D2 connection PWM controller, and simultaneously, the VCC of PWM end is by the second capacitor C 2 ground connection.The second diode D2 and the second capacitor C 2 form 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 for arranging inclined output electric 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.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize 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 according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
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, for the switching frequency of being controlled the switching tube on former limit by described control signal, 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 the first sampling resistor and the second sampling resistor;
The different name end of auxiliary winding is described the first sampling resistor and the second sampling resistor ground connection by series connection successively, described the first sampling resistor be connected the common port of sampling resistor and connect the input of described current operator unit.
3. the device of control change device output current voltage response according to claim 1 is characterized in that, described current operator unit comprises the first amplifier, the first resistance and the second resistance;
The positive input terminal of the first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of the first amplifier by the second resistance, and the output of the first amplifier connects the negative input end of the first amplifier by the first resistance; The output of the 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 the second input of mirror current source is by adjustable resistance ground connection;
The first output head grounding of mirror current source, the 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 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 sends to described current operator unit after keeping for the voltage of secondary output voltage sampling unit sampling is sampled.
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 the first diode and the first electric capacity;
The different name end of auxiliary winding is described the first diode and the first capacity earth by series connection successively, described the first diode be connected the common port of electric capacity and connect the input of described current operator unit.
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 the second control signal according to described control signal and former limit peak current sampled signal, and described the second control signal is sent to respectively described constant-current controller and constant-voltage controller;
Described constant-voltage controller is used for determining according to described the second control signal the 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 for the ON time that determines former limit according to described the second control signal, is realized the characteristic of constant output 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 the first amplifier, the first resistance and the second resistance;
The positive input terminal of the first amplifier connects default reference voltage, and the output of secondary output voltage sampling unit connects the negative input end of the first amplifier by the second resistance, and the output of the first amplifier connects the negative input end of the first amplifier by the first resistance; The output of the 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 the second input of mirror current source is by adjustable resistance ground connection;
The first output head grounding of mirror current source, the 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 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 the first sampling resistor and the second sampling resistor;
The different name end of auxiliary winding is described the first sampling resistor and the second sampling resistor ground connection by series connection successively, described the first sampling resistor be connected the common port of sampling resistor and connect the input of described current operator unit;
Or,
Described secondary output voltage sampling unit comprises the first diode and the first electric capacity;
The different name end of auxiliary winding is described the first diode and the first capacity earth by series connection successively, described the first diode be connected the common port of electric capacity and connect the input of described current operator unit.
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| 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 |
| 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 |
| US9124185B2 (en) * | 2012-07-12 | 2015-09-01 | Dialog Semiconductor Inc. | Configurable power controller with combination input/output line |
| CN102801340B (en) * | 2012-08-20 | 2014-07-02 | 浙江大学 | Control method and controller for AC-DC converter |
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| US10763747B2 (en) | 2016-07-19 | 2020-09-01 | Microchip Technology Incorporated | Controlled adaptive power limiter |
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| CN101795077A (en) | 2010-08-04 |
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