CN203339957U - Switch power supply voltage-stabilizing current-limiting double closed loop control circuit - Google Patents
Switch power supply voltage-stabilizing current-limiting double closed loop control circuit Download PDFInfo
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- CN203339957U CN203339957U CN2013203518668U CN201320351866U CN203339957U CN 203339957 U CN203339957 U CN 203339957U CN 2013203518668 U CN2013203518668 U CN 2013203518668U CN 201320351866 U CN201320351866 U CN 201320351866U CN 203339957 U CN203339957 U CN 203339957U
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Abstract
The utility model discloses a switch power supply voltage-stabilizing current-limiting double closed loop control circuit, comprising a voltage control loop connected to a main circuit, a current control loop connected with an output end of the voltage control loop, a clamping circuit connected with the output end of the voltage control loop and an output end of the current control loop, a triangle carrier wave comparing circuit connected with the output end of the current control loop and used for outputting a PWM signal to a backward-stage drive circuit, and a ratio control circuit connected in parallel with the voltage control loop and the current control loop. The switch power supply voltage-stabilizing current-limiting double closed loop control circuit provided by the utility model can overcome deficiencies of conventional single voltage loop control and simultaneously realize voltage-stabilizing and current-limiting functions by double closed loop control. An overstrike inhibition method provided by the utility model is realized by employing the parallelly connected double closed loop control circuit and ratio control circuit, and is very effective for inhibiting overstrike occurring in the cases that the circuits start with light load or suddenly change from full load to zero load.
Description
Technical field
The utility model relates to the two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting, belongs to the power electronics applied technical field.
Background technology
The power conversion technology has been widely applied to the fields such as industry, the energy, traffic, transportation, information, Aeronautics and Astronautics, national defence, education, culture at present.Past, linear power supply is because technology is very ripe, have that output ripple voltage is little, transient response speed is fast, voltage regulation and load regulation is good, do not have High-frequency Interference, circuit simply to be convenient to the advantage such as maintenance is widely applied, but due to reasons such as himself circuit structure and working methods, also there are some fatal shortcomings in linear power supply, as large as power consumption, efficiency is low, volume is large, weight is large etc., thereby will progressively by Switching Power Supply, be replaced.Switching Power Supply has that frequency is high, volume is little, efficiency is high, output voltage range is wide, be easy to the advantages such as modularization, be modern society's requisite power electronic equipment of living, it all has a very wide range of applications in fields such as electronics, communication, electric, the energy, illumination, Aero-Space, military affairs and household electrical appliances.
One of core technology of Switching Power Supply is its control method.Traditional voltage-controlled type Switching Power Supply can be out of control to switching current, is not easy to overcurrent protection, and low-response, poor stability.By comparison, current control type switching power supply is a voltage, current double closed-loop control system, can overcome electric current shortcoming out of control, and dependable performance, circuit are simple.The shortcoming that current-mode control is controlled for voltage-type grows up, and outside having retained the output voltage FEEDBACK CONTROL part of voltage-controlled type, has increased again a current feedback link.Current control type switching power supply is a voltage, current double closed-loop control system, and interior ring is current regulator, and outer shroud is voltage control loop.No matter be that output voltage changes, or the output current variation, all can make the output pulse duty factor of control circuit change, thereby reach the purpose of output voltage stabilization.Can there be over control in traditional Switching Power Supply voltage stabilizing, the two closed control circuits of current limliting in adjustment process, cause circuit working unstable situation to occur.
The utility model content
The utility model, for existing switching power source control circuit above shortcomings, proposes the two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting, makes Switching Power Supply obtain very large optimization on control performance.
The technical solution of the utility model is:
The two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting, comprise the voltage control loop that is connected in main circuit, the current regulator be connected with the output of voltage control loop, the clamp circuit be connected with the output of voltage control loop and current regulator respectively, the triangular carrier comparison circuit be connected with the output of current regulator, triangular carrier comparison circuit output pwm signal, be delivered to the drive circuit of rear class.
Further, the two closed control circuits of described Switching Power Supply voltage stabilizing current limliting also comprise the proportional control circuit be in parallel with described voltage control loop and current regulator.
Further, described voltage control loop comprises resistance
r 1and resistance
r 2, electric capacity
c 1, the output voltage sampled signal
v of, reference voltage
v ref, operational amplifier OP1; Reference voltage
v refpositive pole with the input in the same way of operational amplifier OP1, be connected, minus earth, resistance
r 1an end and output voltage sampled signal
v ofbe connected, the other end is connected with the reverse input end of operational amplifier OP1, resistance
r 2an end with the reverse input end of operational amplifier OP1, be connected, resistance
r 2the other end and electric capacity
c 1an end be connected, electric capacity
c 1the other end with the output of operational amplifier OP1, be connected, the output that the output of operational amplifier OP1 is voltage control loop.
Further, the described clamp circuit be connected with the output of voltage control loop comprises diode
d 1and reference voltage
v ref1; Diode
d 1anode with the output of voltage control loop, be connected, diode
d 1negative electrode and reference voltage
v ref1positive pole be connected, reference voltage
v ref1minus earth; The described clamp circuit be connected with the output of current regulator comprises diode
d 2and reference voltage
v ref2; Diode
d 2anode with the output of current regulator, be connected, negative electrode and reference voltage
v ref2positive pole be connected, reference voltage
v ref2minus earth.
Further, described current regulator comprises resistance
r 3, resistance
r 4and resistance
r 5, electric capacity
c 2, inductive current
i lf, operational amplifier OP2; Resistance
r 3an end with the output of voltage control loop, be connected, the other end is connected with the input in the same way of operational amplifier OP2, resistance
r 4an end and inductive current
i lfbe connected, the other end is connected with the reverse input end of operational amplifier OP2, resistance
r 5an end with the reverse input end of operational amplifier OP2, be connected, the other end and electric capacity
c 2an end be connected, electric capacity
c 2the other end with the output of operational amplifier OP2, be connected, the output that the output of operational amplifier OP2 is current regulator.
Further, described triangular carrier comparison circuit comprises comparator C OM and triangular carrier signal
v tr; The input in the same way of comparator C OM is connected with the output of current regulator, the reverse input end of comparator C OM and triangular carrier signal
v trbe connected, comparator C OM output pwm signal, be connected to the drive circuit of rear class.
Further, described proportional control circuit comprises resistance
r 6and resistance
r 7, operational amplifier OP3, diode
d 3; Resistance
r 6an end and output voltage sampled signal
v of be connected, the other end is connected with the reverse input end of operational amplifier OP3, and the positive input of operational amplifier OP3 is connected with the positive input of operational amplifier OP1, resistance
r 7an end with the reverse input end of operational amplifier OP3, be connected, the other end is connected with the output of operational amplifier OP3, diode
d 3negative electrode with the output of operational amplifier OP3, be connected, anode is connected with the output of current regulator.
Further, the described clamp circuit be connected with the output of voltage control loop is the 3.3V clamp circuit, and the described clamp circuit be connected with the output of current regulator is the 3V clamp circuit.
Further, described main circuit is the buck main circuit, comprises input voltage
v in, power MOSFET tube, fly-wheel diode
d, inductance
l, output filter capacitor
c, provide the inductive current of current sample input signal for current regulator
i lf, load resistance
r lD, provide the output voltage sampled signal for voltage control loop
v ofoutput voltage
v o; Input voltage
v inpositive pole with the collector electrode of power MOSFET tube, be connected, the emitter of power MOSFET tube respectively with fly-wheel diode
dnegative electrode and inductance
lan end be connected, inductance
lthe other end respectively with electric capacity
can end and load resistance
r lDan end be connected, electric capacity
cand load resistance
r lDthe other end respectively with input voltage
v innegative pole be connected, fly-wheel diode
danode and input voltage
v innegative pole be connected, from inductance
lthe inductive current flowed out provides inductive current for voltage control loop
i lf, load resistance
r lDthe output voltage at two ends
v ofor voltage control loop provides the output voltage sampled signal
v of.
The beneficial effects of the utility model are:
1, the two closed control circuits of the Switching Power Supply voltage stabilizing current limliting the utility model proposes, can overcome the deficiency that traditional univoltage ring is controlled, and by two closed-loop controls, realizes the function of voltage stabilizing and current limliting simultaneously;
2, the overshoot damping circuit the utility model proposes, adopt with two closed control circuit proportional control circuit in parallel and realize, for the circuit light start and the inhibition of being fully loaded with when sporting no-load condition and overshoot occurring very effective.
The accompanying drawing explanation
Fig. 1 is a kind of buck main circuit adopted in the utility model;
Fig. 2 is the circuit diagram of the two closed control circuits of a kind of Switching Power Supply voltage stabilizing of the utility model current limliting.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
The two closed control circuits of a kind of Switching Power Supply voltage stabilizing of the utility model current limliting comprise load output voltage sampled signal
v of, inductive current
i lfsampled input signal, voltage control loop, 3.3V clamp circuit, current regulator, 3V clamp circuit, triangular carrier comparison circuit, PWM output signal.Voltage control loop is by resistance
r 1, resistance
r 2, electric capacity
c 1, load output voltage sampled signal
v of, reference voltage
v refform reference voltage
v refpositive pole with the input in the same way of operational amplifier OP1, be connected, reference voltage
v refminus earth, resistance
r 1an end and output voltage sampled signal
v ofbe connected, resistance
r 1the other end with the reverse input end of operational amplifier OP1, be connected, resistance
r 2an end with the reverse input end of operation amplifier OP1, be connected, resistance
r 2the other end and electric capacity
c 1an end be connected, electric capacity
c 1the other end with the output of operational amplifier OP1, be connected.3.3V clamp circuit is by diode
d 1and reference voltage
v ref1form diode
d 1anode is connected with the output of operational amplifier OP1, diode
d 1negative electrode and reference voltage
v ref1positive pole be connected, reference voltage
v ref1negative pole be connected to the ground.Current regulator is by resistance
r 3, resistance
r 4, resistance
r 5, electric capacity
c 2, inductive current
i lfform resistance
r 3an end with the output of operational amplifier OP1, be connected, resistance
r 3the other end with the input in the same way of operational amplifier OP2, be connected, resistance
r 4an end and inductive current
i lfbe connected, resistance
r 4the other end with the reverse input end of operational amplifier OP2, be connected, resistance
r 5an end with the reverse input end of operational amplifier OP2, be connected, resistance
r 5the other end and electric capacity
c 2an end be connected, electric capacity
c 2the other end with the output of operational amplifier OP2, be connected.The 3V clamp circuit is by diode
d 2and reference voltage
v ref2form diode
d 2anode with the output of operational amplifier OP2, be connected, diode
d 2negative electrode and reference voltage
v ref2positive pole be connected, reference voltage
v ref2negative pole be connected to the ground.The input in the same way of comparator C OM is connected with the output of operational amplifier OP2, the reverse input end of comparator C OM and triangular carrier signal
v trbe connected, comparator C OM output pwm signal, be connected to the drive circuit of rear class.
The main circuit adopted in the utility model is the buck main circuit, its circuit diagram as shown in Figure 1, wherein:
v infor input voltage;
qfor power MOSFET tube;
dfor fly-wheel diode;
lfor inductance;
cfor output filter capacitor;
i lffor inductive current;
r lDfor load resistance;
v ofor output voltage.This main circuit comprises input voltage
v in, power MOSFET tube, fly-wheel diode
d, inductance
l, output filter capacitor
c, provide the inductive current of current sample input signal for current regulator
i lf, load resistance
r lD, provide the output voltage sampled signal for voltage control loop
v ofoutput voltage
v o; Input voltage
v inpositive pole with the collector electrode of power MOSFET tube, be connected, the emitter of power MOSFET tube respectively with fly-wheel diode
dnegative electrode and inductance
lan end be connected, inductance
lthe other end respectively with electric capacity
can end and load resistance
r lDan end be connected, electric capacity
cand load resistance
r lDthe other end respectively with input voltage
v innegative pole be connected, fly-wheel diode
danode and input voltage
v innegative pole be connected, from inductance
lthe inductive current flowed out provides inductive current for voltage control loop
i lf, load resistance
r lDthe output voltage at two ends
v ofor voltage control loop provides the output voltage sampled signal
v of.
In the utility model, main circuit adopts the two closed loop control methods of voltage stabilizing current limliting, and operation principle is as follows:
(1) when the main circuit shown in Fig. 1 starts, the given reference voltage of voltage control loop impact
v ref , main circuit output voltage now
v o =0, corresponding output voltage sampled signal
v of =0, the output of voltage control loop must enter saturation condition, by clamp circuit, the output valve of voltage control loop operational amplifier OP1 is clamped to 3.3V.Simultaneously, due to now also not foundation of circuit output current,
i lf=0, so the output valve of current regulator operational amplifier OP2 is also very high, can designs and make it also enter saturation condition, by clamp circuit, the output valve of current regulator also is clamped to 3V, be also comparator C OM input terminal voltage pincers at 3V, this value with triangular carrier signal
v trby comparator C OM relatively after, the pwm signal of comparator output is full duty ratio, and circuit output voltage now
v o very little, therefore the slope that inductive current rises is very large, the slope of decline is very little, is also that the speed of inductive current rising is very fast.
(2) after inductive current rises to certain certain value, current regulator output starts to descend, and the pwm signal duty ratio reduces thereupon, but due to circuit output voltage
v o still little, therefore descending slope is still very little, inductive current can continue to rise, and now overshoot will occur.Until the output of current regulator drops to zero, duty ratio is reduced to till zero, and inductive current just starts to descend, and drops to certain phase, vibration may occur, finally is stabilized in a constant, and now circuit is in the constant current charge stage.
(3) in the constant current charge process, because inductive current is greater than load current, so circuit output voltage
v o be continuous the rising, inductive current is the slope step-down in the process risen, and in the decline process, slope increases, so the mean value of inductive current can descend, in current regulator output meeting, rises always, and voltage control loop keeps open loop situations, circuit output voltage
v o rise gradually, until circuit output voltage rises to desired set point.
(4) circuit output voltage
v o once be greater than desired set point, voltage control loop integral element starts electric discharge, and voltage control loop operational amplifier OP1 starts to move back saturated, and output substantially is linear and descends.Dropping to before clamp value 3.3V inductive current
i lfvalue remains unchanged, and still to electric capacity, continues charging, so circuit output voltage
v o continuing increases, and starts to occur overshoot.Until voltage control loop output voltage decline 3.3V is when following, inductive current
i lfthe output that value starts to follow voltage control loop descends together, but decrease speed is slower than the decrease speed of voltage control loop output, so current regulator integral element starts electric discharge, current regulator operational amplifier OP2 starts to move back saturated, current regulator output reduces, and duty ratio diminishes, inductive current
i lfreduce, until be less than output load current thereupon
i o the time, output filter capacitor C just starts electric discharge, output voltage
v o start slow decreasing, the now output of voltage control loop and current regulator is all descending.Work as output voltage
v o while dropping to certain value, voltage control loop output starts again to rise, and duty ratio increases, inductive current
i lffollowing Voltage loop increases, now inductive current
i lfstill be less than output load current
i o therefore electric capacity continues electric discharge, until inductive current
i lfbe greater than output load current
i o till, circuit output voltage
v o just slowly go up, reach gradually balance, final inductive current
i lfshould and output load current
i o equate.
In sum, the starting process of this pair of closed loop voltage-regulating system has two characteristics:
(1) saturated nonlinear control
Along with voltage control ring filling and unsaturated, whole Circuits System is in diverse two states.When voltage control loop is full while closing, voltage control loop is in open loop situations, and system shows as single closed-loop control system that the constant electric current is regulated; When voltage control loop is unsaturated, Voltage loop is in the closed loop state, and whole system is a floating voltage-regulating system, and current inner loop shows as the electric current servomechanism.Show the linear system into different structure under different situations, the feature of Here it is saturated nonlinear control.While analyzing transient process, also must be noted that initial condition, the end of a period state of previous stage is the initial condition of the latter half.If the initial condition difference, even the structure and parameter of control system is all constant, transient process is also different.
(2) voltage overshoot
Owing to having adopted saturated nonlinear control, starting process finishes to enter voltage-regulation after the stage, must be that voltage control loop exits saturation condition.According to the characteristic of pi regulator, only make voltage overshoot, the input deviation voltage of voltage control loop
for negative value, just can make voltage control loop exit saturated.That is to say, adopt the voltage dynamic response of two closed loop voltage control systems of pi regulator that overshoot must be arranged.In the ordinary course of things, slightly overshoot is little on the actual motion impact for voltage.
When if on engineering, the part of overshoot is much higher than desired scope, this just necessarily requires to take certain measure overshoot of disinthibiting.Described Reducing overshoot method is as follows:
This overshoot damping method adopts the proportional control circuit be in parallel with two closed control circuits to realize, the device circuit diagram as shown in Figure 2, in figure:
v offor the output voltage sampled signal;
r 1,
r 2,
r 3,
r 4,
r 5,
r 6,
r 7for resistance;
c 1,
c 2for electric capacity;
d 1,
d 2,
d 3for diode; OP1, OP2, OP3 is three operational amplifiers; COM is comparator;
v reffor reference voltage;
v ref1reference voltage for the 3.3V clamp circuit;
v ref2reference voltage for the 3V clamp circuit;
i lffor inductive current;
v trfor the triangular carrier signal.
This proportional control circuit is by resistance
r 6, resistance
r 7, operational amplifier OP3, diode
d 3form resistance
r 6an end and output voltage sampled signal
v of be connected, resistance
r 6the other end with the reverse input end of operational amplifier OP3, be connected, the positive input of operational amplifier OP3 is connected with the positive input of operational amplifier OP1, resistance
r 7an end with the reverse input end of operational amplifier OP3, be connected, resistance
r 7the other end with the output of operational amplifier OP3, be connected, diode
d 3negative electrode with the output of operational amplifier OP3, be connected, diode
d 3anode with the output of operational amplifier OP2, be connected.The two closed control circuits of improvement shown in Fig. 2, when realizing voltage stabilizing, current-limiting function, very effective for circuit light start and fully loaded inhibition when sporting no-load condition and overshoot occurring.
On the basis of two closed control circuits, a proportional control link in parallel, as the overshoot damping circuit of dotted portion below Fig. 2.Its main thought is when voltage rises to some values, and this proportional control link is output as zero, duty ratio is pulled down rapidly, thereby suppressed overshoot.During design, at first set
v omax, work as voltage and rise to
v omaxthe time, proportional parts output drops to zero at once.The on-state voltage drop of supposing diode is zero,
v omaxusually a little more than
v o, about 0.5V left and right,
Formula (1) can be reduced to
（2）
As long as therefore selected resistance
r 6and resistance
r 7value, just can reach desired output characteristic.Fig. 2 control circuit is when light start, and the two closed loop operation principles of the operation principle of initial period when not increasing the proportional control link are consistent.When voltage rises to
v omaxthe time, proportional control link output descends, when the output that drops to lower than current regulator, and the diode current flow of proportional control ring, the input of PWM comparator is exactly the output of proportional control ring, now because voltage just rises to
v omaxjust start to descend, therefore the very slow (discharging current of the velocity of discharge of voltage control loop integral element
ilittle), so the given of current regulator remains on always
v ref , and because duty ratio has now been drawn very soon, so inductive current descends rapidly, dropping to before load current, output voltage still can rise, and a little more than
v omax.At this moment current regulator input is
v ref , another input is the voltage that output current feeds back.Owing to being light start, so the voltage fed back is very low, so that the output of current regulator also rises to gradually is saturated, now voltage control loop and current regulator are all in the operate in open loop state state, and duty ratio is regulated by the proportional control ring.When inductive current is less than load current, circuit output voltage
v ostart to descend, dropping to
v omaxin the past, the output of proportional control ring can slightly be risen, but ascensional range is not too large, until output voltage is less than
v omaxafter, the output of proportional control ring just can be risen gradually, and inductive current also can rise thereupon, and finally the two reaches stable.
The two closed control circuits of the Switching Power Supply voltage stabilizing current limliting the utility model proposes, can overcome the deficiency that traditional univoltage ring is controlled, and by two closed-loop controls, realizes the function of voltage stabilizing and current limliting simultaneously; The overshoot damping method the utility model proposes, adopt with two closed control circuit proportional control circuit in parallel and realize, for the circuit light start and the inhibition of being fully loaded with when sporting no-load condition and overshoot occurring very effective.The control circuit the utility model proposes is applicable to various Switching Power Supplies application scenario, has good engineering reference value.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. two closed control circuits of a Switching Power Supply voltage stabilizing current limliting, it is characterized in that: comprise the voltage control loop that is connected in main circuit, the current regulator be connected with the output of voltage control loop, the clamp circuit be connected with the output of voltage control loop and current regulator respectively, the triangular carrier comparison circuit be connected with the output of current regulator, triangular carrier comparison circuit output pwm signal, be delivered to the drive circuit of rear class.
2. the two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1, is characterized in that: also comprise the proportional control circuit be in parallel with described voltage control loop and current regulator.
3. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 2, it is characterized in that: described voltage control loop comprises resistance
r 1and resistance
r 2, electric capacity
c 1, the output voltage sampled signal
v of, reference voltage
v ref, operational amplifier OP1; Reference voltage
v refpositive pole with the input in the same way of operational amplifier OP1, be connected, minus earth, resistance
r 1an end and output voltage sampled signal
v ofbe connected, the other end is connected with the reverse input end of operational amplifier OP1, resistance
r 2an end with the reverse input end of operational amplifier OP1, be connected, resistance
r 2the other end and electric capacity
c 1an end be connected, electric capacity
c 1the other end with the output of operational amplifier OP1, be connected, the output that the output of operational amplifier OP1 is voltage control loop.
4. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1 and 2, it is characterized in that: the described clamp circuit be connected with the output of voltage control loop comprises diode
d 1and reference voltage
v ref1; Diode
d 1anode with the output of voltage control loop, be connected, diode
d 1negative electrode and reference voltage
v ref1positive pole be connected, reference voltage
v ref1minus earth; The described clamp circuit be connected with the output of current regulator comprises diode
d 2and reference voltage
v ref2; Diode
d 2anode with the output of current regulator, be connected, negative electrode and reference voltage
v ref2positive pole be connected, reference voltage
v ref2minus earth.
5. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1 and 2, it is characterized in that: described current regulator comprises resistance
r 3, resistance
r 4and resistance
r 5, electric capacity
c 2, inductive current
i lf, operational amplifier OP2; Resistance
r 3an end with the output of voltage control loop, be connected, the other end is connected with the input in the same way of operational amplifier OP2, resistance
r 4an end and inductive current
i lfbe connected, the other end is connected with the reverse input end of operational amplifier OP2, resistance
r 5an end with the reverse input end of operational amplifier OP2, be connected, the other end and electric capacity
c 2an end be connected, electric capacity
c 2the other end with the output of operational amplifier OP2, be connected, the output that the output of operational amplifier OP2 is current regulator.
6. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1 and 2, it is characterized in that: described triangular carrier comparison circuit comprises comparator C OM and triangular carrier signal
v tr; The input in the same way of comparator C OM is connected with the output of current regulator, the reverse input end of comparator C OM and triangular carrier signal
v trbe connected, comparator C OM output pwm signal, be connected to the drive circuit of rear class.
7. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 3, it is characterized in that: described proportional control circuit comprises resistance
r 6and resistance
r 7, operational amplifier OP3, diode
d 3; Resistance
r 6an end and output voltage sampled signal
v of be connected, the other end is connected with the reverse input end of operational amplifier OP3, and the positive input of operational amplifier OP3 is connected with the positive input of operational amplifier OP1, resistance
r 7an end with the reverse input end of operational amplifier OP3, be connected, the other end is connected with the output of operational amplifier OP3, diode
d 3negative electrode with the output of operational amplifier OP3, be connected, anode is connected with the output of current regulator.
8. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1 and 2, it is characterized in that: the described clamp circuit be connected with the output of voltage control loop is the 3.3V clamp circuit, and the described clamp circuit be connected with the output of current regulator is the 3V clamp circuit.
9. two closed control circuits of a kind of Switching Power Supply voltage stabilizing current limliting according to claim 1 and 2, it is characterized in that: described main circuit is the buck main circuit, comprises input voltage
v in, power MOSFET tube, fly-wheel diode
d, inductance
l, output filter capacitor
c, provide the inductive current of current sample input signal for current regulator
i lf, load resistance
r lD, provide the output voltage sampled signal for voltage control loop
v ofoutput voltage
v o; Input voltage
v inpositive pole with the collector electrode of power MOSFET tube, be connected, the emitter of power MOSFET tube respectively with fly-wheel diode
dnegative electrode and inductance
lan end be connected, inductance
lthe other end respectively with electric capacity
can end and load resistance
r lDan end be connected, electric capacity
cand load resistance
r lDthe other end respectively with input voltage
v innegative pole be connected, fly-wheel diode
danode and input voltage
v innegative pole be connected, from inductance
lthe inductive current flowed out provides inductive current for voltage control loop
i lf, load resistance
r lDthe output voltage at two ends
v ofor voltage control loop provides the output voltage sampled signal
v of.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103326575A (en) * | 2013-06-19 | 2013-09-25 | 江苏大学 | Switching power supply voltage-stabilization current-limiting double closed loop control circuit and overshoot restraining method thereof |
| CN105425889A (en) * | 2015-11-09 | 2016-03-23 | 华北电力大学（保定） | High-precision voltage and current stability control circuit based on high-frequency power supply pre-regulation level |
| CN105549669A (en) * | 2015-12-29 | 2016-05-04 | 吉林大学 | Constant current source device based on dual ring negative feedback |
| CN108418410A (en) * | 2018-03-16 | 2018-08-17 | 上海艾为电子技术股份有限公司 | Soft starting circuit with output voltage feedback |
| CN110649800A (en) * | 2019-10-25 | 2020-01-03 | 天津航空机电有限公司 | High-precision current limiting circuit |
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2013
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326575A (en) * | 2013-06-19 | 2013-09-25 | 江苏大学 | Switching power supply voltage-stabilization current-limiting double closed loop control circuit and overshoot restraining method thereof |
| CN105425889A (en) * | 2015-11-09 | 2016-03-23 | 华北电力大学（保定） | High-precision voltage and current stability control circuit based on high-frequency power supply pre-regulation level |
| CN105549669A (en) * | 2015-12-29 | 2016-05-04 | 吉林大学 | Constant current source device based on dual ring negative feedback |
| CN105549669B (en) * | 2015-12-29 | 2016-12-14 | 吉林大学 | A kind of based on the degenerative constant-current source device of dicyclo |
| CN108418410A (en) * | 2018-03-16 | 2018-08-17 | 上海艾为电子技术股份有限公司 | Soft starting circuit with output voltage feedback |
| CN110649800A (en) * | 2019-10-25 | 2020-01-03 | 天津航空机电有限公司 | High-precision current limiting circuit |
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