CN101212184B - Slope compensation method and circuit for power switching circuit - Google Patents
Slope compensation method and circuit for power switching circuit Download PDFInfo
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- CN101212184B CN101212184B CN2007101597221A CN200710159722A CN101212184B CN 101212184 B CN101212184 B CN 101212184B CN 2007101597221 A CN2007101597221 A CN 2007101597221A CN 200710159722 A CN200710159722 A CN 200710159722A CN 101212184 B CN101212184 B CN 101212184B
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Abstract
The invention provides a slope compensation circuit of a power conversion circuit used in a control mode of peak current. The power conversion circuit comprises two straightforward converters and a pulse width regulating controller which controls the movement of the two straightforward converters. The slope compensation circuit comprises a first charging loop having a first series resistor formedby parallel connecting two resistors and a capacitor, wherein, two ends of the first series resistor are respectively connected with one end of the capacitor and a DC power, the other end of the capacitor is connected with a feedback input end of output voltage of the pulse width regulating controller; a second charging loop which has a second series resistor formed by parallel connecting two resistors and which is in series with the first series resistor; a discharging loop having a third electronic switch and a fourth electronic switch which are respectively connected with series nodes of the first and second series resistors. Return signals of voltage compensated by the invention can effectively avoid misjudgment due to surges generated when another electronic switch of the power conversion circuit turns on noise coupling, so as to provide DC power with stable output.
Description
Technical field
The present invention relates to a kind of slope compensation method and circuit thereof that is used for the power-switching circuit of peak current control model, relate in particular to a kind of power-switching circuit that suppresses the peak current control model of diverter switch generation noise with slope equalizer.
Background technology
At present direct current is to export after DC power supply is processed into single group or organizes different voltage dcs source more to direct current transducer, use with different circuit units on the supply circuit board, or different electronic installation uses.
Direct current has many dissimilar to the control mode of direct current transducer, a kind of is the power-switching circuit of peak current control model, and this kind peak current control model has the advantage that circuit is simplified, but shortcoming is exactly to suppress ability because noise makes.See also shown in Figure 8, Fig. 8 be the direct current of an existing peak current control model to DC converting circuit 50, it includes:
One first and second forward formula transducer 51,52 is made up of two groups of high frequency transformer T3, T4 and two main switch Q1, Q2 at least; Wherein the primary side of each high frequency transformer T3, T4 connects corresponding main switch Q1, Q2, opens and closes the decision primary side current by main switch Q1, Q2 and whether produces, and is the output of power-switching circuit 50 as for the secondary side output of each high frequency transformer T3, T4; And
One PWM controller 53, it includes two pulse-width modulation output OUT1, OUT2, two output voltage feedback input COMP1, COMP2 and two electric currents and feedbacks input CS1, CS2, wherein two pulse-width modulation output OUT1, OUT2 are connected to main switch Q1, the Q2 control end of first and second forward formula transducer 51,52, two output voltages return the dc power output end that feed side COMP1, COMP2 then are coupled to corresponding forward formula transducer 51,52 again, to obtain two voltage feedback signal Verror1, the Verror2 of corresponding two dc power output ends; Again, each electric current back coupling input CS1, CS2 obtain the electric current feedback signal of the current status of its corresponding high frequency transformer T3, T4 primary side.
Above-mentioned direct current is to use the control mode of carrying out pulse-width modulation with the current peak comparison to DC converting circuit 50, please consult shown in Figure 9 earlier, Fig. 9 is two main switch Q1, when Q2 drives with the pulse width signal of opening 50% pulsewidth respectively, measure to such an extent that two electric currents are feedback input CS1, the ideal waveform of the electric current feedback signal of CS2, that is reach 50% pulsewidth during the time when the ON time of first electronic switch, the feedback current peak value corresponding voltage value VCS1 of first electric current back coupling input CS1 can be greater than the magnitude of voltage VCOMP1 of the first voltage feedback signal, this PWM controller 53 can be closed the first main switch Q1 and be controlled the second main switch Q2 conducting simultaneously this moment, in like manner, when the second electronic switch Q2 ON time reached for 50% pulsewidth time, this PWM controller 53 can be compared feedback current peak value corresponding voltage value VCS2 and the present second voltage feedback signal magnitude of voltage VCOMP2 of the second induction by current end CS2, and in the corresponding voltage VCS2 of current peak institute that judges the second induction by current end CS2 during greater than the present second voltage feedback signal VCOMP1, promptly close the second main switch Q2 and control the first main switch Q1 simultaneously, make first and second main switch Q1, the pulsewidth branch of Q2 accounts for half of a complete pulse width period.By above stated specification as can be known, PWM controller 53 is the current peaks according to present each high frequency transformer T3, T4 primary side current feedback signal, convert corresponding voltage value to, compare with the voltage feedback signal magnitude of voltage of corresponding high frequency transformer T3, T4 secondary side output voltage again, in case voltage peak greater than the feedback voltage magnitude of voltage, then alternately changes the keying state of first and second main switch Q1, Q2 at present.
Yet, when two main switch Q2 respectively by with open greater than 50% pulse-width modulation signal after the driving situation, the control mode of peak-current mode will be desirable as described above.Suppose that first and second main switch Q1, Q2 are driven by 55% pulse-width modulation signal respectively, please cooperate consult shown in Figure 10, when having only the first main switch Q1 to be driven conducting in the t10 time, the first main switch Q1 should arrive for 55% pulsewidth time and is closed in the t12 time in theory, but because arrive earlier and will drive the second main switch Q2 conducting early than the t20 time point of t12 time point; Because the second main switch Q2 is driven conducting in the t20 time point, make the current waveform of the electric current back coupling input CS1 that wins produce the moment surging in the t11 time, and this surging generation in a flash can cause PWM controller 53, can be higher than its secondary side feedback voltage voltage of signals value VCOMP1 at the voltage peak VCS1 that judges the first electric current feedback signal correspondence, and then close the first main switch Q1, shown in ideal waveform (dotted line sign place) the first main switch Q1 by the premature closure first main switch Q1 promptly can coupling influence the primary side current waveform of the conducting second high frequency transformer T4, then as shown in figure 11, first and second high frequency transformer T3, vibration then can't be avoided producing in the output DC source of T4.In like manner, when the second main switch Q2 ON time near 55% pulsewidth time t21, can be because the first main switch Q1 be driven conducting by PWM controller 53 at the t13 time point again, its conducting moment again the second high frequency transformer T4 primary side current of the present conducting of coupling influence produce the moment surging, make the voltage peak VCS2 of the second electric current feedback signal correspondence on the t21 time point, be higher than the pairing magnitude of voltage VCOMP2 of the second voltage feedback signal, and close the second main switch Q2, in like manner compared to ideal waveform (shown in dotted line), because of this second main switch Q2 premature closure, and close close in wink promptly not can coupling influence the primary side current waveform of the conducting first high frequency transformer T3, but still cause the vibration DC power supply.
As shown in the above description, as long as the pulse-width modulation signal of first and second electronic switch Q1, Q2 was greater than 50% o'clock, the work period of first and second forward formula transducer 51,52 can overlap mutually, the noise that produced when this moment, electronic switch cut out can be coupled on another group source current waveform, influence is closed the judgement of electronic switch with the current peak decision, and then causes the oscillatory occurences of output.Therefore, the direct current of peak current control model is to the further improvement design of DC converting circuit palpus, so that more galvanic current source to be provided at present.
Summary of the invention
The purpose of this invention is to provide a kind of slope equalizer, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, and described slope equalizer includes:
One first charge circuit, include one first series resistance and an electric capacity that two resistance serial connection forms, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series with two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop, comprise one the 3rd and quadrielectron switch, each the 3rd and quadrielectron open relation comprise a two-terminal and a control end, wherein the 3rd and the corresponding respectively series connection node that is connected to first and second series resistance of the wherein terminal of quadrielectron switch, another terminal is ground connection then; The control end of the 3rd electronic switch is connected to the control end of the described first forward formula transducer, first main switch again, and the control end of quadrielectron switch then is connected to the control end of described second forward formula transducer second main switch again; The 3rd and quadrielectron switch promptly respectively with first and second main switch synchronous opening/closing.
The respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
The described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The present invention also provides a kind of described power-switching circuit of slope equalizer that is used for the power-switching circuit of peak current control model to include two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, and described slope equalizer includes:
One first charge circuit, be connected in series one first series resistance and an electric capacity that forms with two resistance, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series with two resistance, and this second series resistance is in parallel with first series resistance; And
One discharge loop, comprise one the 3rd and quadrielectron switch, each the 3rd and quadrielectron open relation comprise a two-terminal and a control end, wherein the 3rd and the corresponding respectively series connection node that is connected to first and second series resistance of the wherein terminal of quadrielectron switch, another terminal is ground connection then; The described again the 3rd and the control end of quadrielectron switch connect a current transformer respectively, its two current transformer is of coupled connections respectively to corresponding first and second high frequency transformer primary side, to respond to the current signal of corresponding high frequency transformer primary side, make the 3rd and quadrielectron switch respectively with first and second main switch synchronous opening/closing.
The respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
The described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The present invention further provides a kind of described power-switching circuit of slope equalizer that is used for the power-switching circuit of peak current control model and included two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, and described slope equalizer includes:
One first charge circuit, comprise one first series resistance and an electric capacity that two resistance serial connection forms, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series by two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop comprises first and second diode, and wherein said first diode anode is connected to the second series resistance series connection node, and its negative electrode then is connected to the second main switch control end again; Second diode anode then is connected to the first series resistance series connection node, and its negative electrode is connected to the first main switch control end again.
The respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
The described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The present invention further provides a kind of slope equalizer that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, and described slope equalizer includes:
One first charge circuit, be connected in series one first series resistance and an electric capacity that forms by two resistance, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series by two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop, comprise first and second diode, the anode of wherein said first diode is connected to the second series resistance series connection node, second diode anode then is connected to the first series resistance series connection node, the negative electrode of first diode and second diode is connected second and first current transformer respectively, and this second and first current transformer is coupled respectively to contact and is connected to the corresponding second and first high frequency transformer primary side.To respond to the current signal of corresponding high frequency transformer primary side, make first and second diode respectively with the second and first main switch synchronous opening/closing.
The respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
The described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
The present invention further provides a kind of slope compensation method that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, and wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively; Described slope compensation method includes:
Obtain synchronizing signal with first and second main switch drive signal;
Produce one group of triangular signal, the rise time of this triangular signal is by first and second main switch drive signal decision; And
Triangular signal is added a pair of should output by power-switching circuit, and be used in the direct voltage feedback signal used of comparison current peak, to constitute triangular wave direct voltage feedback signal, and the voltage quasi position of this triangular wave direct voltage feedback signal is higher than the accurate position of this direct voltage feedback signal, this triangular wave direct voltage feedback signal inputs in the output voltage feedback input of PWM controller, it is right to make this PWM controller carry out peakedness ratio with described triangular wave direct voltage feedback signal and first and second high frequency transformer primary side current signal corresponding voltage value, determines the drive signal of first and second main switch.
Described synchronizing signal obtains from first and second main switch drive end.
Described synchronizing signal is obtained by the current transformer that is of coupled connections in two high frequency transformer primary sides from first and second main switch drive signal.
Compared with prior art, the present invention has following beneficial effect:
The 3rd and quadrielectron switch of slope equalizer of the present invention and first and second main switch synchronous opening/closing, thus the rise time of the triangular wave of capacitor charge and discharge generation can be made, identical with first and second high frequency transformer primary side current ON time; Again, this electric capacity is connected to the output voltage feedback input of this PWM controller, so can feedback the voltage feedback signal of input and compensate originally inputing to this output voltage, and compensation becomes one and is three high angle voltage feedback signals than the accurate position of direct voltage feedback signal; Therefore, when the output of this PWM controller is higher than 50% pulse-width modulation signal to two main switch, can effectively avoid because the conducting current signal surging of high frequency transformer the shortcoming that allows the electronic switch of present high frequency transformer close ahead of time.
Description of drawings
Fig. 1 is applied to the detailed circuit diagram of the power-switching circuit of a peak current control model for the present invention;
Fig. 2 A to Fig. 2 C is the equivalent electric circuit in the present invention's first preferred embodiment and PWM controller voltage feedback end and voltage feedback signal source;
Fig. 3 A to Fig. 3 F is the voltage and the current waveform figure of each input of PWM controller among Fig. 1 of the present invention and output;
Fig. 4 A to Fig. 4 B once surveys conducting electric current institute corresponding voltage waveform comparison diagram for the high levle triangle wave voltage feedback signal ripple of the present invention and first high frequency transformer;
Fig. 5 is the triangular wave generation unit second preferred embodiment circuit diagram of the present invention;
Fig. 6 is triangular wave generation unit the 3rd a preferred embodiment circuit diagram of the present invention;
Fig. 7 is triangular wave generation unit the 4th a preferred embodiment circuit diagram of the present invention;
Fig. 8 is the circuit diagram of existing peak current control model power-switching circuit;
Fig. 9 exports the current waveform figure of the two electric currents back coupling input under the 50% pulse-width modulation signal for PWM controller among Fig. 8;
Figure 10 exports the current waveform figure of the two electric currents back coupling input under the 55% pulse-width modulation signal for PWM controller among Fig. 8;
Figure 11 is the voltage oscillogram of power output end among Fig. 8.
Wherein,
10 power-switching circuits, 11 first forward formula transducers
12 second forward formula transducer 13 PWM controller
21,21a, 21b, 21c slope equalizer
22 first series resistances, 23 second series resistances
24 electric capacity 25 the 3rd electronic switch
26 quadrielectron switches 27 are diode forward
28 first current transformers, 29 second current transformers
30 first diodes, 31 second diodes
50 DC converting circuit, 51 forward formula transducers
52 to formula transducer 53 PWM controller
Embodiment
Cause output DC source vibration shortcoming in order effectively to eliminate because of electronic switch opens and closes switching noise, help to adopt the direct current of current peak control model to DC converting circuit, output galvanic current source the invention provides a kind of slope compensation method and compensating circuit.
The present invention is directed to the direct voltage feedback signal that inputs to the output voltage feedback input of pulse wave modulator originally and carry out slope-compensation, make triangular wave direct voltage feedback signal and conducting current signal after this compensation carry out the subsequent voltage size when comparing, and the situation that can effectively avoid the surging on the conducting current signal to allow the electronic switch of present high frequency transformer close ahead of time.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, Fig. 1 is used for a kind of slope equalizer 21a of power-switching circuit 10 of peak current control model for the present invention, wherein be effectively to reduce to use high efficiency and bulky transformer, this power-switching circuit is with the output-parallel of first and second forward formula transducer 11,12, one group of input DC power OUT only is provided, first and second forward formula transducer 11,12 is controlled by a PWM controller 13 again, and it includes respectively:
The one first or second high frequency transformer T1, T2, its primary side is connected to an input DC power; And
The one first or second main switch Q4, Q6, polyphone is connected to the primary side of this high frequency transformer T1, T2, by keying decision high frequency transformer T1, the T2 current lead-through of the described first or second main switch Q4, Q6 denys.
Again, above-mentioned PWM controller 13 includes:
Two pulse-width modulation output OUT1, OUT2, be connected to respectively corresponding first and second forward formula transducer 11,12, first and second main switch Q4, Q6 control end;
Two output voltage feedback input COMP1, COMP2 are coupled in the dc power output end of corresponding first or second forward formula transducer 11,12 respectively, to obtain one group of output voltage feedback signal; And
Two electric currents back coupling input CS1, CS2 obtain the conducting current signal of first and second high frequency transformer T1, T2 primary side respectively.
Input as for slope equalizer 21a of the present invention is of coupled connections to one group of dc power output end, because present embodiment is applied in the power-switching circuit in single group output DC source, so the output of present embodiment slope equalizer then is of coupled connections to two output voltages of this PWM controller 13 and returns feed side COMP1, among the COMP2, with with one than the high triangular wave direct voltage feedback signal in the accurate position of former direct voltage feedback signal, input to two output voltage feedback input COMP1 of this PWM controller 13 simultaneously with the direct voltage feedback signal, COMP2.
Please cooperate and consult shown in Fig. 2 C, above-mentioned slope equalizer 21a includes:
One first charge circuit, include one first series resistance 22 and an electric capacity 24 that two resistance R 63, R66 serial connection forms, wherein these first series resistance, 22 two ends connect this electric capacity 24 1 ends and first DC power supply+V1 respectively, and these electric capacity 24 other ends are connected to output voltage feedback input COMP1, the COMP2 of this PWM controller 13 again;
One second charge circuit includes one second series resistance 23 that is in series by two resistance R 68, R67, and this second series resistance 23 is in parallel with first series resistance 22; And
One discharge loop comprises one the 3rd and quadrielectron switch 25,26, the corresponding respectively series connection node that is connected to first and second series resistance 22,23; Wherein the control end of the 3rd electronic switch 25 is connected to the control end of the above-mentioned first forward formula transducer, the first main switch Q4, and the control end of quadrielectron switch 26 then is connected to the control end of above-mentioned second forward formula transducer second main switch Q6; Therefore, the 3rd and quadrielectron switch 25,26 promptly respectively with first and second main switch Q4, Q6 synchronous opening/closing.
Below further specify the mode that above-mentioned slope equalizer triangular wave generation unit 21a embodiment produces the triangular wave direct voltage feedback signal of the accurate position of high direct current:
Please consult Fig. 1 and Fig. 2 A to 2C simultaneously, because above-mentioned slope equalizer 21a output is connected to output voltage feedback input COMP1, the COMP2 of PWM controller 13, this output voltage feedback input COMP1, COMP2 connect one second direct voltage source V2 by an interior resistance R IN again, its voltage is lower than the first direct voltage source V, so its equivalent electric circuit is shown in Fig. 2 A to 2C circuit, again for convenience of description for the purpose of, making the photistor of optical coupler M4 establish vacation is a current source IO.
Cooperate shown in Fig. 3 A to Fig. 3 F, when PWM controller 13 outputs one pulse width signal by t10 to t12 gives the first main switch Q4, can make the first main switch Q4 conducting, so the time have the conducting electric current by the first current transformer T3 induction high frequency transformer T1 that wins; At the same time, the 3rd switch 25 of the present invention is conducting simultaneously also, and the second main switch Q6 and quadrielectron switch Q6, Q1626 then present closed condition; Because first voltage source V, 1 voltage is higher than second voltage source V 2, and the 3rd electronic switch 25 make the first charge circuit series connection node short circuit, therefore first voltage source V 1 can be charged to electric capacity by second charge circuit, shown in Fig. 2 A, and VCOMP1 and the rising of VCOMP2 current potential; See also Fig. 2 B again, when PWM controller 13 is controlled the second electronics main switch Q6 conducting in t11 to the t12 time, promptly make this section period the 3rd and quadrielectron switch 25,26 conductings simultaneously, and order is full of the electric capacity 24 of electric charge for the previous period and begins the 3rd and quadrielectron switch 25,26 by conducting discharge and VCOMP1 and VCOMP2 current potential descend over the ground; Please cooperate and consult shown in Fig. 4 A to Fig. 4 B, when electric capacity 24 is discharged to a period of time, can with the pairing magnitude of voltage VCS1 of the current peak intersection of the conducting current signal of the first high frequency transformer T1, the first main switch Q4 promptly controlled immediately by this frequency width modulation controller 13 and the 3rd electronic switch 25 cuts out; And for example shown in Fig. 2 C and Fig. 3 A to Fig. 3 F, this frequency width modulation controller 13 only continues control second main switch Q6 and quadrielectron switch Q6,26 conductings, and electric capacity 24 also charges by first charge circuit, PWM controller 13 is controlled when the first main switch Q4 and 25 conductings of the 3rd electronic switch again, electric capacity 24 promptly can discharge, make triangle wave voltage feedback signal VCOMP1 and VCOMP2 descend, up to the current peak corresponding voltage value VCS2 intersection of the conducting current signal of the second high frequency transformer T2 time, PWM controller 13 is promptly closed second main switch Q6 and the quadrielectron switch 26, so periodic duty.
By Fig. 4 A, Fig. 4 B as can be known, slope equalizer of the present invention carries out slope-compensation to the output dc voltage of power-switching circuit really, the order output voltage feedback signal compensation of direct current originally becomes the higher triangle wave voltage feedback signal VCOMP of a more former output voltage feedback signal voltage quasi position, (VCOMP2, thus, can avoid effectively because of the high frequency transformer conducting, the abrupt voltage wave premature closure two main switch Q4 that produced, Q6, and can correctly reach the second main switch Q4 in first, Q6 closes when predetermined originally pulsewidth width arrives, and can premature closure first and the and second switch Q4, Q6.The triangle wave voltage feedback signal rate of rise and descending slope as for high levle can change because of first and second resistance in circuit value and the capacitance that uses; Most preferred embodiment makes resistance R 63=R68 again, and R66=R67 allows the charge-discharge characteristic of two current circuits reach unanimity.
Again, see also Fig. 5, Fig. 5 is second preferred embodiment of slope equalizer 21b of the present invention, its most circuit design is identical with first preferred embodiment, the resistance R 66 that is connected with electric capacity 24 in first and second series resistance, R67 forward diode D1, D2 of one of parallel connection more only,, discharge and recharge the time to adjust RC.
See also Fig. 6, Fig. 6 is the 3rd preferred embodiment of slope equalizer 21c of the present invention, its most circuit design is identical with first preferred embodiment, the 3rd and quadrielectron switch 25 in present embodiment, 26 control ends (gate) are by a current inductor, as: current transformer is of coupled connections and is connected to first and two corresponding high frequency transformer T1, T2, primary side, to obtain high frequency transformer T1, T2 primary side conducting current signal, it opens first and second main switch Q4 with conduct, the drive signal of Q6 is synchronous, closes the 3rd and quadrielectron switch 25 so can be used as, 26 foundation.
See also shown in Figure 7, Fig. 7 is the 4th preferred embodiment of slope equalizer 21d of the present invention, its most circuit design is identical with first preferred embodiment, thought the 3rd and quadrielectron switch 25,26 are replaced by first and second diode 30,31, wherein the anode of first diode 30 connects the series connection node of the series resistance 23 of the one the second charge circuits, negative electrode then can be connected with the control end of the second main switch Q6, or is connected to a current transformer that is serially connected with the second high frequency transformer T2 primary side; In like manner, the anode of second diode 31 is connected to the series connection node of the series resistance 22 of the 21 charge circuit, and its negative electrode can be connected with the control end of the first main switch Q4, or is connected to the current transformer that another is serially connected with the first high frequency transformer T1 primary side.
Above-mentioned electronic switch can be transistors such as MOSFET or BJT.
By the various embodiments described above as can be known, slope compensation method of the present invention includes:
Obtain synchronizing signal with first and second main switch drive signal;
Produce one group of triangular signal, the rise time of this triangular signal is by first and second main switch drive signal decision; And
With triangular signal add a pair of should power-switching circuit an output dc voltage feedback signal size wherein, and be used in the voltage feedback signal used of comparison current peak, is high triangular wave direct voltage feedback signal to constitute one than the accurate position of direct voltage feedback signal, this triangular wave direct voltage feedback signal inputs in the output voltage feedback input of pulse-width regulating device, it is right to make this PWM controller carry out peakedness ratio with this triangular wave direct voltage feedback signal and first and second high frequency transformer primary side current signal corresponding voltage value, determines the drive signal of first and second main switch.
To sum up, the present invention is directed to the output dc voltage feedback signal and carry out slope-compensation, the triangular wave direct voltage feedback signal that makes this accurate position of high direct current and conducting current signal carry out the subsequent voltage size when comparing, can effectively avoid the surging on the conducting current signal, the situation that allows the electronic switch of present high frequency transformer close ahead of time; Therefore above-mentioned slope compensation method can effectively reduce the conducting noise because of the alternate conduction electronic switch, and the shortcoming of the output DC source oscillatory instability that causes.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (23)
1. slope equalizer that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, it is characterized in that described slope equalizer includes:
One first charge circuit, include one first series resistance and an electric capacity that two resistance serial connection forms, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series with two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop, comprise one the 3rd and quadrielectron switch, each the 3rd and quadrielectron open relation comprise a two-terminal and a control end, wherein the 3rd and the corresponding respectively series connection node that is connected to first and second series resistance of the wherein terminal of quadrielectron switch, another terminal is ground connection then; The control end of the 3rd electronic switch is connected to the control end of the described first forward formula transducer, first main switch again, and the control end of quadrielectron switch then is connected to the control end of described second forward formula transducer second main switch again; The 3rd and quadrielectron switch promptly respectively with first and second main switch synchronous opening/closing.
2. slope equalizer as claimed in claim 1, it is characterized in that, the respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
3. slope equalizer as claimed in claim 1 or 2, it is characterized in that, the described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
4. slope equalizer as claimed in claim 1 or 2, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
5. slope equalizer as claimed in claim 3, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
6. slope equalizer that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, it is characterized in that described slope equalizer includes:
One first charge circuit, be connected in series one first series resistance and an electric capacity that forms with two resistance, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series with two resistance, and this second series resistance is in parallel with first series resistance; And
One discharge loop, comprise one the 3rd and quadrielectron switch, each the 3rd and quadrielectron open relation comprise a two-terminal and a control end, wherein the 3rd and the corresponding respectively series connection node that is connected to first and second series resistance of the wherein terminal of quadrielectron switch, another terminal is ground connection then; The described again the 3rd and the control end of quadrielectron switch connect a current transformer respectively, its two current transformer is of coupled connections respectively to corresponding first and second high frequency transformer primary side, to respond to the current signal of corresponding high frequency transformer primary side, make the 3rd and quadrielectron switch respectively with first and second main switch synchronous opening/closing.
7. slope equalizer as claimed in claim 6, it is characterized in that, the respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
8. as claim 5 or 6 described slope equalizers, it is characterized in that, the described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
9. as claim 5 or 6 described slope equalizers, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
10. slope equalizer as claimed in claim 7, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
11. slope equalizer that is used for the power-switching circuit of peak current control model, described power-switching circuit include two forward formula transducers and one in order to the PWM controller of controlling the action of two forward formula transducers wherein each forward formula transducer include first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, it is characterized in that described slope equalizer includes:
One first charge circuit, comprise one first series resistance and an electric capacity that two resistance serial connection forms, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series by two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop comprises first and second diode, and wherein said first diode anode is connected to the second series resistance series connection node, and its negative electrode then is connected to the second main switch control end again; Second diode anode then is connected to the first series resistance series connection node, and its negative electrode is connected to the first main switch control end again.
12. slope equalizer as claimed in claim 11, it is characterized in that, the respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
13. as claim 11 or 12 described slope equalizers, it is characterized in that, the described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
14. as claim 11 or 12 described slope equalizers, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
15. slope equalizer as claimed in claim 13, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
16. slope equalizer that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively, it is characterized in that described slope equalizer includes:
One first charge circuit, be connected in series one first series resistance and an electric capacity that forms by two resistance, the wherein said first series resistance two ends connect described electric capacity one end and a direct current power supply respectively, and the described again electric capacity other end is connected to the output voltage feedback input of described PWM controller;
One second charge circuit includes one second series resistance that is in series by two resistance, and described second series resistance is in parallel with first series resistance; And
One discharge loop, comprise first and second diode, the anode of wherein said first diode is connected to the second series resistance series connection node, second diode anode then is connected to the first series resistance series connection node, the negative electrode of first diode and second diode is connected second and first current transformer respectively, this second and first current transformer is coupled respectively to contact and is connected to the corresponding second and first high frequency transformer primary side, to respond to the current signal of corresponding high frequency transformer primary side, make first and second diode respectively with the second and first main switch synchronous opening/closing.
17. slope equalizer as claimed in claim 16, it is characterized in that, the respectively further diode in parallel of the resistance that is connected with electric capacity in described first and second series resistance, the anode of each diode is connected to the series connection node of corresponding first and second series resistance, and negative electrode then is connected to this electric capacity.
18. as claim 16 or 17 described slope equalizers, it is characterized in that, the described electric capacity other end further is connected to one group of output DC pressure side of power-switching circuit by an optical coupler, the light-emitting diodes pipe end of wherein said optical coupler is connected to the output DC pressure side, and photistor then is connected to described electric capacity.
19. as claim 16 or 17 described slope equalizers, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
20. slope equalizer as claimed in claim 18, it is characterized in that, the resistance value of two resistance that are connected with electric capacity in described first series resistance and second series resistance is identical, and first series resistance is identical with the resistance value of other two resistance of second series resistance.
21. slope compensation method that is used for the power-switching circuit of peak current control model, described power-switching circuit includes two forward formula transducers and in order to control the PWM controller of two forward formula transducer actions, and wherein each forward formula transducer includes first and second main switch that a high frequency transformer and is series at the high frequency transformer primary side respectively; It is characterized in that described slope compensation method includes:
Obtain synchronizing signal with first and second main switch drive signal;
Produce one group of triangular signal, the rise time of this triangular signal is by first and second main switch drive signal decision; And
Triangular signal is added a pair of should output by power-switching circuit, and be used in the direct voltage feedback signal used of comparison current peak, to constitute triangular wave direct voltage feedback signal, and the voltage quasi position of this triangular wave direct voltage feedback signal is higher than the accurate position of this direct voltage feedback signal, this triangular wave direct voltage feedback signal inputs in the output voltage feedback input of PWM controller, it is right to make this PWM controller carry out peakedness ratio with described triangular wave direct voltage feedback signal and first and second high frequency transformer primary side current signal corresponding voltage value, determines the drive signal of first and second main switch.
22. slope compensation method as claimed in claim 21 is characterized in that, described synchronizing signal obtains from first and second main switch drive end.
23. slope compensation method as claimed in claim 21 is characterized in that, described synchronizing signal is obtained by the current transformer that is of coupled connections in two high frequency transformer primary sides from first and second main switch drive signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101597221A CN101212184B (en) | 2007-12-21 | 2007-12-21 | Slope compensation method and circuit for power switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101597221A CN101212184B (en) | 2007-12-21 | 2007-12-21 | Slope compensation method and circuit for power switching circuit |
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| Publication Number | Publication Date |
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| CN101212184A CN101212184A (en) | 2008-07-02 |
| CN101212184B true CN101212184B (en) | 2010-06-09 |
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| CN2007101597221A Expired - Fee Related CN101212184B (en) | 2007-12-21 | 2007-12-21 | Slope compensation method and circuit for power switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9608606B2 (en) | 2015-08-27 | 2017-03-28 | Amazing Microelectronic Corp. | Slope control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285519B (en) * | 2020-10-26 | 2022-06-24 | 中国科学院上海微系统与信息技术研究所 | Method for measuring series resistance and ideal factor in diode gating array |
| CN113204290B (en) * | 2021-04-19 | 2022-12-30 | 深圳天德钰科技股份有限公司 | Signal compensation circuit, touch control circuit and display device |
| CN115395775A (en) * | 2022-09-30 | 2022-11-25 | 苏州英威腾电力电子有限公司 | Slope compensation circuit and PWM modulation circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4689730A (en) * | 1985-04-05 | 1987-08-25 | Victor Company Of Japan, Ltd. | Flyback transformer circuit with a noise cancelling circuit |
| CN1447507A (en) * | 2003-04-08 | 2003-10-08 | 毛灿豪 | Switching power supply |
-
2007
- 2007-12-21 CN CN2007101597221A patent/CN101212184B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4689730A (en) * | 1985-04-05 | 1987-08-25 | Victor Company Of Japan, Ltd. | Flyback transformer circuit with a noise cancelling circuit |
| CN1447507A (en) * | 2003-04-08 | 2003-10-08 | 毛灿豪 | Switching power supply |
Non-Patent Citations (1)
| Title |
|---|
| JP平7-231653A 1995.08.29 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9608606B2 (en) | 2015-08-27 | 2017-03-28 | Amazing Microelectronic Corp. | Slope control circuit |
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| CN101212184A (en) | 2008-07-02 |
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