CN102186292B - Primary edge current reference generating circuit and method for high power factor constant-current switch power supply - Google Patents
Primary edge current reference generating circuit and method for high power factor constant-current switch power supply Download PDFInfo
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- CN102186292B CN102186292B CN2011101110791A CN201110111079A CN102186292B CN 102186292 B CN102186292 B CN 102186292B CN 2011101110791 A CN2011101110791 A CN 2011101110791A CN 201110111079 A CN201110111079 A CN 201110111079A CN 102186292 B CN102186292 B CN 102186292B
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Abstract
The invention relates to a primary edge current reference generating circuit and a primary edge current reference generating method for a high power factor constant-current switch power supply. The conventional primary edge current reference generating circuit is complicated. An input end of a first multiplier is used as an input end of the primary edge current reference generating circuit; an input end of a conduction angle detection circuit is used as another input end of the primary edge current reference generating circuit, and the output end of the conduction angle detection circuit is connected with another input end of the first multiplier; the output end of the first multiplier is used as an input end of a current loop; another input end of the current loop is used as the other input end of the primary edge current reference generating circuit; the output end of the current loop is connected with an input end of a second multiplier; another input end of the second multiplier is connected with the input end of the conduction angle detection circuit; and the output end of the second multiplier is used as the output end of the primary edge current reference generating circuit. Sampling hold is not required, so that the error caused by sample hold is eliminated, and the constant-current precision of the output current is improved.
Description
Technical field
The invention belongs to the switch power technology field, relate to a kind of primary current reference generating circuit and method of high power factor constant current Switching Power Supply.
Background technology
At present a lot of isolated supplies such as charger for mobile phone and high-power LED driver are because application demand requires circuit that the function of output constant current is arranged usually; In addition, in order to alleviate the extent of injury of electric pollution, satisfy the harmonic standard IEEE555-2 of International Electrotechnical Commission and IEC1000-3-2 etc., above-mentioned isolated supplies also must possess power factor correction (PFC) function, Fig. 1 is single-level power factor correction scheme relatively more commonly used at present: by detecting the output current of transformer secondary side, deliver to former limit PFC control circuit through the optocoupler feedback after secondary carries out constant current control.Prior art scheme shown in Figure 1 has increased the complexity of circuit owing to the existence of secondary current sample circuit and optocoupler, further, because there is problem of aging in optocoupler, the stability of circuit and useful life all is under some influence.
Solution for the problems referred to above is to adopt the control program that has the constant current control of former limit and power factor emendation function concurrently, namely need not secondary current sampling and optic coupling element, directly by obtain the information of output current on the former limit of isolating transformer, controlled and realized output constant current, and realize simultaneously High Power Factor, as shown in Figure 2.The index of weighing two most criticals in the above-mentioned control program is the High Power Factor of inlet wire current and the constant current accuracy of output current, and especially owing to adopting the control of former limit, the constant current accuracy of output current is not as secondary constant current control.
The prior art of present a kind of output constant current is by simulating secondary current on former limit, the secondary output current simulated out or secondary output current mean value calculation out, then carry out constant current control on former limit, as shown in Figure 3, by being sampled, primary current ipri keeps obtaining primary current peak value and corresponding secondary current peak value, wherein ipri is the primary current signal, Vcontrol is sampled signal, isample keeps module output signal for sampling, and iemu is secondary current analog module output signal.Yet in side circuit, because sampling keeps module to have certain delay time between sample ﹠ hold switches, can cause the error of primary current peak value sampling, thereby cause the secondary current iemu and the actual value that simulate to have deviation, as shown in Figure 4, and this deviate can change with input voltage and transformer excitation inductance value, relatively be difficult to compensation, thereby cause the output constant current can be different with input voltage, the transformer excitation inductance be different and change, and the output constant current precision is lower.
Another kind of output constant current prior art commonly used is the method for permanent power, as shown in Figure 5.Ac input signal obtains rectified half-waves signal Vin behind over commutation, obtain the effective value of AC-input voltage after the rectified half-waves signal Vin process electric voltage feed forward module, i.e. input voltage feed forward signal Vff; Simultaneously, obtain waveform signal Iac behind its process waveform-shaping module K1.Wherein, waveform signal Iac=k * Vin, k are a coefficient.Vea is controlled constant in constant current output circuit.Multiplier carries out multiplying to described waveform signal Iac, input voltage feed forward signal Vff and controlled constant Vea, obtains current reference signal:
Thereby the control inductive current is consistent with current reference signal, realizes the PFC function.Can see, this multiplier by with the input voltage feed forward signal square as molecule, in the situation that Vea is certain, realize that input power and input voltage are irrelevant, namely permanent power is controlled.The method that the above-mentioned impact that utilizes multiplier to offset input voltage obtains current reference is essentially voltage feedforward control.Yet in the situation that there is phase-controlled dimmer to exist, ac input signal can not lack simultaneously in the light modulation angle, it also no longer is complete half-wave after its rectification, therefore inputting feed-forward signal Vff has comprised the cut angle signal, this voltage feedforward control can cause Iref sharply to increase along with the increase of cut angle, input power is corresponding sharp increase also, so said method is not suitable for the occasion of phase-controlled dimming.
Summary of the invention
The present invention overcomes the defective that exists in the above-mentioned prior art, a kind of current reference circuit for generating has been proposed, this current reference circuit for generating can produce the primary current reference signal of the high power factor constant current Switching Power Supply main circuit that is applicable to the thyristor regulating photocontrol, and realizes output constant current control.
The technical scheme that technical solution problem of the present invention is taked is:
The primary current reference generating circuit of high power factor constant current Switching Power Supply comprises angle of flow testing circuit, the first multiplier, the second multiplier and electric current loop.An input of the first multiplier is as an input of primary current reference generating circuit, the input of angle of flow testing circuit is as another input of primary current reference generating circuit, output is connected with another input of the first multiplier, the output of the first multiplier is as an input of electric current loop, another input of electric current loop is as another input of primary current reference generating circuit, the output of electric current loop is connected with an input of the second multiplier, another input of the second multiplier is connected with the input of angle of flow testing circuit, and the output of the second multiplier is as the output of primary current reference generating circuit.
A kind of way of realization of electric current loop comprises input resistance, operational amplifier and compensating network, one end of input resistance is as an input of electric current loop, the negative input of another termination operational amplifier, the positive input of operational amplifier is as another input of electric current loop, the output of operational amplifier is as the output of electric current loop, one end of compensating network is connected with the negative input of operational amplifier, and the other end of compensating network is connected with the output of operational amplifier.
The another kind of way of realization of described electric current loop comprises input resistance, operational amplifier and compensating network, one end of input resistance is as an input of electric current loop, the negative input of another termination operational amplifier, the positive input of operational amplifier is as another input of electric current loop, the output of operational amplifier is as the output of electric current loop, one end of compensating network is connected with the output of operational amplifier, the other end ground connection of compensating network.
Further say, described primary current reference generating circuit also comprises the first filter and the second filter, the input of the first filter is as the input of primary current reference generating circuit, the output of the first filter is connected with an input of the first multiplier, the input of the second filter is as the input of primary current reference generating circuit, and the output of the second filter is connected with an input of electric current loop.
Further say, described primary current reference generating circuit also comprises the 3rd filter and the 3rd multiplier, the input of the 3rd filter is as primary current reference generating circuit input, the output of the 3rd filter is connected with an input of the 3rd multiplier, another input of the 3rd multiplier is as another input of primary current reference generating circuit, and the output of the 3rd multiplier is connected with the input of the second filter.
The implementation method of primary current reference generating circuit comprises the steps:
(1) mean value of the primary current of acquisition Switching Power Supply main circuit
(2) the switching tube driving pulse ON time signal Ton of acquisition reflection Switching Power Supply main circuit;
(3) the output diode ON time signal Toff1 of acquisition reflection Switching Power Supply main circuit;
(4) signal alpha of the thyristor operating angle of acquisition reflection Switching Power Supply main circuit;
(5) by control so that
Mean value be steady state value K, and obtain
And the error amplification signal Verror between K * Ton * a mean value;
(6) the commutating voltage waveform signal Iac of the rectifier bridge output of acquisition Switching Power Supply main circuit;
(7) the voltage waveform signal Iac that the error amplification signal Verror that step (5) is obtained and step (6) obtain multiplies each other, and produces primary current benchmark Iref.
When the Switching Power Supply main circuit was operated in current continuity or critical continuous conduction mode, above-mentioned steps can further be reduced to:
(1) mean value of the primary current of acquisition Switching Power Supply main circuit
(2) the switching tube driving pulse duty cycle signals D of acquisition Switching Power Supply main circuit;
(3) signal alpha of the thyristor operating angle of acquisition reflection Switching Power Supply main circuit;
(4) by control so that
Mean value be steady state value K, and obtain
And the error amplification signal Verror between K * D * a mean value;
(5) the commutating voltage waveform signal Iac of the rectifier bridge output of acquisition Switching Power Supply main circuit;
(6) the voltage waveform signal Iac that the error amplification signal Verror that step (4) is obtained and step (5) obtain multiplies each other, and produces primary current benchmark Iref.
Beneficial effect of the present invention: the current reference circuit for generating that the present invention proposes only need detect the primary current signal and can realize the closed loop feedback of output current constant current is controlled, and produces simultaneously former limit and realizes the required current reference of High Power Factor control; The present invention is that mean value by the primary current signal obtains to the constant current of output current control, keep and need not sampling, eliminated the error that the sampling maintenance brings, improved the constant current accuracy of output current, and not only be applicable to continuous current mode but also be applicable to the discontinuous current pattern, and can realize phase-controlled dimming control.
Description of drawings
Fig. 1 is the single-stage power factor correcting circuit of a kind of secondary constant current of the prior art;
Fig. 2 is the constant-current circuit schematic diagram with High Power Factor of former limit control;
Fig. 3 is a kind of constant-current switch power source and control circuit thereof of former limit control of prior art;
Fig. 4 is the sampling error schematic diagram that sampling hold circuit causes;
Fig. 5 is the constant current output pfc circuit of controlling based on the former limit that permanent power principle is realized;
Fig. 6 A, Fig. 6 B, Fig. 6 C and Fig. 6 D are current reference circuit for generating of the present invention;
Fig. 7 is that inverse-excitation type switch power-supply is operated in the former secondary current waveform of continuous current mode;
Fig. 8 is that inverse-excitation type switch power-supply is operated in the former secondary current waveform of discontinuous current pattern;
Fig. 9 is high power factor constant current switching power source control circuit first specific embodiment of former limit control of the present invention;
Figure 10 is high power factor constant current switching power source control circuit second specific embodiment of former limit control of the present invention;
Figure 11 is high power factor constant current switching power source control circuit the 3rd specific embodiment of former limit control of the present invention;
Figure 12 is high power factor constant current switching power source control circuit the 4th specific embodiment of former limit control of the present invention;
Figure 13 is the first specific embodiment of switching tube conducting control module;
Figure 14 is the second specific embodiment of switching tube conducting control module;
Figure 15 is a specific embodiment of output diode ON time detection module;
Figure 16 is the waveform of output diode ON time detection module when the discontinuous current pattern;
Figure 17 is the first specific embodiment that the high power factor constant current switching power source control circuit of former limit control of the present invention is applied to the inverse-excitation type constant-current switch power source;
Figure 18 is the second specific embodiment that the high power factor constant current switching power source control circuit of former limit control of the present invention is applied to the inverse-excitation type constant-current switch power source.
Embodiment
Be elaborated below in conjunction with block diagram of the present invention and specific embodiment schematic diagram content of the present invention.
As shown in Figure 6A, primary current reference generating circuit of the present invention comprises:
Angle of flow testing circuit 105: angle of flow testing circuit receives the output waveform signals Vac from the rectifier bridge of Switching Power Supply main circuit, the output reflection controllable silicon dimmer angle of flow and the fixing pulse signal of amplitude;
The first multiplier 106: described the first multiplier 106 receives from the driving signal Vg of the switching tube of Switching Power Supply main circuit and the output signal of angle of flow testing circuit 105, exports the product of the two;
Electric current loop 107: described electric current loop 107 comprises operational amplifier Uf, input resistance R1, compensating network C1; Wherein input resistance R1 one termination is received the primary current signal ipri from the Switching Power Supply main circuit, the negative terminal input of resistance R 1 another termination operational amplifier, the anode input of operational amplifier Uf connects the output of the first multiplier 106, and operational amplifier Uf is output as the output of electric current loop 107; Described electric current loop 107 has the average value filtering function, therefore at the input of operational amplifier Uf, the mean value of primary current signal ipri and the output signal of the first multiplier 106 compare, the error signal of the two output after operational amplifier Uf and compensating network C1 amplification.
Introduced two filters at the primary current reference generating circuit shown in the relative Fig. 6 A of the primary current reference generating circuit shown in Fig. 6 B, wherein:
The first filter 104: described the first filter receives the driving signal Vg from the switching tube of Switching Power Supply main circuit, its high-frequency harmonic component of filtering, an input of output termination first multiplier of the first filter;
The second filter 101: the primary current signal ipri that described the second filter 101 receives from the Switching Power Supply main circuit, its harmonic component of filtering, the mean value of output ipri, the end of the input resistance R1 of the output termination electric current loop 107 of the second filter 101;
Other part of module of primary current reference generating circuit shown in Fig. 6 B and annexation are identical with the primary current reference generating circuit shown in Fig. 6 A.
The primary current reference generating circuit shown in relative Fig. 6 B has been introduced the 3rd filter 103 and the 3rd multiplier 102 in the primary current reference generating circuit shown in Fig. 6 C, wherein, the control signal Vtoff1 of an input termination reflection secondary diode current flow time of the 3rd filter 103, an input of output termination the 3rd multiplier 102 of the 3rd filter 103, the average value signal of the primary current signal ipri of another input termination the second filter 101 outputs of the 3rd multiplier 102, the product of the two is delivered to an input of electric current loop 107; Other part of module of primary current reference generating circuit shown in Fig. 6 C and annexation are identical with the primary current reference generating circuit shown in Fig. 6 B.
Further, the position of the 3rd filter 103 in the primary current reference generating circuit shown in Fig. 6 C can change, shown in Fig. 6 D, the input of the 3rd filter 103 connects the output of the 3rd multiplier 102 after the change, the output of the 3rd filter 103 connects an input of electric current loop 107, the control signal Vtoff1 of one of the 3rd multiplier input termination reflection secondary diode current flow time, his part of module and annexation are identical with the primary current reference generating circuit shown in Fig. 6 C.
Described the first multiplier 106 and the 3rd multiplier 102 are multiplier or the equivalent electric circuit module that realizes equivalent function.
Described control signal Vtoff1 is from the auxiliary winding of switching mode power supply transformer or the gate pole control signal of Switching Power Supply.
Identical or the approximately equal of the output diode ON time of the positive pulse width of described control signal Vtoff1 and Switching Power Supply main circuit.
The compensating network of described electric current loop 107 is known technologies such as proportional integral link that electric capacity, resistance and electric capacity consist of;
The operational amplifier of described electric current loop 107 is current mode operational amplifiers, and compensating network is connected between the output and ground of operational amplifier Uc.
The operational amplifier of described electric current loop 107 is voltage-type operational amplifiers, and compensating network is connected between the output and negative input end of operational amplifier Uc.
Former limit switching tube electric current and secondary diode current waveform were respectively as shown in Figure 7 and Figure 8 when Switching Power Supply was operated in continuous current mode and discontinuous current pattern; The expression formula that can derive output current Io under above-mentioned two kinds of mode of operations according to waveform is all:
Wherein,
The mean value of secondary diode current,
Be the mean value of former limit switching tube electric current, Np is the transformer primary side number of turn, and Ns is the transformer secondary number of turn, and Ton is former limit switching tube ON time,
Be the cycle mean value of former limit switching tube ON time, Toff1 is the secondary diode continuousing flow time,
The cycle mean value of secondary diode continuousing flow time.
The principle of the primary current benchmark of the present invention shown in Fig. 6 C is: gather first primary current ipri, obtain the mean value of primary current after 101 filtering of the second filter
Then the mean value of Vtoff1 after the 3rd filter 103 with the control signal that reflects secondary diode continuousing flow time T off1 multiplies each other, and obtains
Obtain the Ton signal by former limit switching drive signal Vg, after the first filter 104 filtering high fdrequency components, obtain the mean value of Ton signal
Send into electric current loop after multiplying each other with the D. C. value of setting, know that by formula (1) needing only two input end signals of control electric current loop operational amplifier equates to realize output constant current, the output waveform signals Vac of the rectifier bridge of the output signal of operational amplifier and Switching Power Supply main circuit output waveform after the second multiplier 108 multiplies each other is that the reference signal Iref of the primary current of half-sinusoid controls to realize PFC; When need carried out phase-controlled dimming, controllable silicon dimmer angle of flow signal was through the pulse signal of the angle of flow testing circuit 105 output reflection angles of flow, with the mean value of Ton signal
Benchmark is sent into electric current loop after multiplying each other, and can realize the output current brightness adjustment control.
Because
Be approximately a direct current level, as can be known
Therefore Fig. 6 C circuit can be deformed into the primary current reference circuit of the present invention shown in Fig. 6 D, and principle is: gather first primary current ipri, obtain the mean value of primary current after 101 filtering of the second filter
Then the control signal Vtoff1 with reflection secondary diode continuousing flow time T off1 multiplies each other, and obtains after 103 filtering of the 3rd filter
Obtain the Ton signal by former limit switching drive signal Vg, after the first filter 104 filtering high fdrequency components, obtain the mean value of Ton signal
Send into electric current loop after multiplying each other with the D. C. value of setting, know that by formula (1) needing only two input end signals of control electric current loop operational amplifier equates to realize output constant current, the output waveform signals Vac of the rectifier bridge of the output signal of operational amplifier and Switching Power Supply main circuit output waveform after the second multiplier 108 multiplies each other is that the reference signal Iref of the primary current of half-sinusoid controls to realize PFC; When need carried out phase-controlled dimming, controllable silicon dimmer angle of flow signal was through the pulse signal of the angle of flow testing circuit 105 output reflection angles of flow, with the mean value of Ton signal
Benchmark is sent into electric current loop after multiplying each other, and can realize the output current brightness adjustment control.
When the Switching Power Supply main circuit is operated in continuous current mode or critical continuous conduction mode, because Ton+Toff1=Ts, wherein Ts is the switch periods of former limit switching tube, can release (2) formula relation by (1) formula.
According to (2) formula, primary current reference generating circuit of the present invention can be simplified shown in Fig. 6 B.Compare with invention circuit block diagram shown in Fig. 6 D with Fig. 6 C, the module relevant with Toff1 the second multiplier 108 and the 3rd filter 103 have been saved among Fig. 6 B, the primary current signal ipri of Switching Power Supply main circuit directly sends into electric current loop after the second filter 101 is average, other module and annexation are all identical with circuit block diagram shown in Fig. 6 C.
Further, because electric current loop 107 has filter function, the first filter 104 and the second filter 101 among Fig. 6 B can further dispense, as shown in Figure 6A, the primary current signal ipri of Switching Power Supply main circuit directly sends into electric current loop, and other module and annexation are constant.
Based on primary current reference generating circuit of the present invention shown in Figure 6, high power factor constant current switching power source control circuit first specific embodiment of former limit control as shown in Figure 9, this control circuit is fit to current continuity, interrupted and critical continuous conduction mode, comprise current reference circuit for generating 1000, output diode ON time detection module 200, comparator 300, switching tube conducting control module 400 and rest-set flip-flop 500, and the splicing ear of control circuit and main circuit comprises primary current sampling end Isen, output diode ON time test side Idet, rectifier bridge voltage waveform signal test side Iac and drive end Drv; Wherein, described current reference circuit for generating 1000 adopts structure shown in Fig. 6 D; Output diode ON time detection module is through the ON time of output diode ON time test side sense switch electric power main circuit diode, and Vtoff1 is to the current reference circuit for generating for the output control signal; The primary current sampled signal is received the positive input terminal of comparator 300 and the Ipri end of current reference circuit for generating through primary current sampling end Isen, the half-sinusoid signal Iref of the negative input end input current reference generating circuit output of comparator 300, the output waveform signals of the rectifier bridge of led driver main circuit is received the Vac end of current reference circuit for generating 1000 through rectifier bridge voltage waveform signal test side Iac, the input R of rest-set flip-flop 500 connects the output of comparator 300, the output of the input S termination switching tube conducting control module 400 of rest-set flip-flop 500, the output signal of rest-set flip-flop 500 is picked gate pole to former limit switch through drive end Drv; Current reference circuit for generating 1000 produces half-sinusoid signal Iref, when the primary current sampled signal rises to when touching half-sinusoid signal Iref, the output signal of comparator 300 is high level from the low level upset, after this drop to when being lower than half-sinusoid signal Iref when the primary current sampled signal, comparator 300 output signals are low level from the high level upset; When the rising edge saltus step from the low level to the high level of 300 to one of the reset terminal R of rest-set flip-flop 500 end detection comparators, the output signal of rest-set flip-flop 500 is reset to low level from high level, the shutoff of the switching tube of control switch electric power main circuit, when the set end S of rest-set flip-flop 500 end detects the rising edge saltus step from the low level to the high level of 400 1 of switching tube conducting control modules, the output signal of rest-set flip-flop 500 is high level from low level set, and the generation pulse signal so goes round and begins again.
High power factor constant current switching power source control circuit second specific embodiment of former limit control of the present invention as shown in figure 10, this control circuit is fit to current continuity and critical continuous conduction mode, comprise current reference circuit for generating 1002, comparator 300, switching tube conducting control module 400 and rest-set flip-flop 500, and the splicing ear of control circuit and main circuit comprises primary current sampling end Isen, rectifier bridge voltage waveform signal test side Iac and drive end Drv; Wherein, described current reference circuit for generating adopts structure shown in Fig. 6 B; The primary current sampled signal is received the positive input terminal of comparator 300 and the Ipri end of current reference circuit for generating through primary current sampling end Isen, the half-sinusoid signal Iref of the negative input end input current reference generating circuit output of comparator 300, the output waveform signals of the rectifier bridge of led driver main circuit is received the Vac end of current reference circuit for generating 1002 through rectifier bridge voltage waveform signal test side Iac, the input R of rest-set flip-flop 500 connects the output of comparator 300, the output of the input S termination switching tube conducting control module 400 of rest-set flip-flop 500, the output signal of rest-set flip-flop 500 is picked gate pole to former limit switch through drive end Drv; Current reference circuit for generating 1002 produces half-sinusoid signal Iref, when the primary current sampled signal rises to when touching half-sinusoid signal Iref, the output signal of comparator 300 is high level from the low level upset, after this drop to when being lower than half-sinusoid signal Iref when the primary current sampled signal, comparator 300 output signals are low level from the high level upset; When the rising edge saltus step from the low level to the high level of 300 to one of the reset terminal R of rest-set flip-flop 500 end detection comparators, the output signal of rest-set flip-flop 500 is reset to low level from high level, the shutoff of the switching tube of control switch electric power main circuit, when the set end S of rest-set flip-flop 500 end detects the rising edge saltus step from the low level to the high level of 400 1 of switching tube conducting control modules, the output signal of rest-set flip-flop 500 is high level from low level set, and the generation pulse signal so goes round and begins again.
High power factor constant current switching power source control circuit the 3rd specific embodiment of former limit control of the present invention as shown in figure 11, this control circuit is fit to current continuity, interrupted and critical continuous conduction mode, comprise current reference circuit for generating 1000, output diode ON time detection module 200, electric current loop 301, comparator 302 and sawtooth waveforms generation module 303, and the splicing ear of control circuit and main circuit comprises primary current sampling end Isen, output diode ON time test side Idet, rectifier bridge voltage waveform signal test side Iac and drive end Drv; Wherein, described current reference circuit for generating 1001 adopts structure shown in Fig. 6 D; Output diode ON time detection module is through the ON time of output diode ON time test side Idet sense switch electric power main circuit diode, and Vtoff1 is to the current reference circuit for generating for the output control signal; The primary current sampled signal is received the Ipri end of current reference circuit for generating 1001 through primary current sampling end Isen, the output signal of the filter 101 in the current reference circuit for generating 1001 is received the negative input end of the operational amplifier Uf2 of electric current loop 301 through resistance R 3, the half-sinusoid signal Iref of the positive input terminal input current reference generating circuit output of the operational amplifier Uf2 of electric current loop 301, the output waveform signals of the rectifier bridge of led driver main circuit is received the Vac end of current reference circuit for generating 1001 through rectifier bridge voltage waveform signal test side Iac, the output of the operational amplifier Uf2 of electric current loop 301 connects R2 and the compensating network of C2 serial connection formation and the positive input terminal of comparator 302, the other end ground connection of compensating network, the output signal of the negative input end input sawtooth waveforms generation module 303 of comparator 302; The mean value of 301 pairs of primary current sampled signals of electric current loop and current reference circuit for generating Iref compare, the error of the two is amplified output through electric current loop 301, the sawtooth signal that the error amplification signal of 302 pairs of electric current loops of comparator, 301 outputs and sawtooth waveforms generation module 303 produce compares, the sawtooth waveforms amplitude that is higher than the sawtooth signal generation of sawtooth waveforms generation module 303 generations when the error amplification signal amplitude of electric current loop 301 outputs, comparator 302 output high level, be lower than the sawtooth waveforms amplitude of the sawtooth signal generation of sawtooth waveforms generation module 303 generations when the error amplification signal amplitude of electric current loop 301 outputs, comparator 302 output low levels.
High power factor constant current switching power source control circuit the 4th specific embodiment of former limit control of the present invention as shown in figure 12, this control circuit is fit to current continuity and critical continuous conduction mode, comprise current reference circuit for generating 1002, electric current loop 301, comparator 302 and sawtooth waveforms generation module 303, and the splicing ear of control circuit and main circuit comprises primary current sampling end Isen, rectifier bridge voltage waveform signal test side Iac and drive end Drv; Wherein, described current reference circuit for generating 1002 adopts structure shown in Fig. 6 B; The primary current sampled signal is received the Ipri end of current reference circuit for generating 1002 through primary current sampling end Isen, the output signal of the filter 101 in the current reference circuit for generating 1002 is received the negative input end of the operational amplifier Uf2 of electric current loop 301 through resistance R 3, the half-sinusoid signal Iref of the positive input terminal input current reference generating circuit output of the operational amplifier Uf2 of electric current loop 301, the output waveform signals of the rectifier bridge of led driver main circuit is received the Vac end of current reference circuit for generating 1002 through rectifier bridge voltage waveform signal test side Iac, the output of the operational amplifier Uf2 of electric current loop 301 connects R2 and the compensating network of C2 serial connection formation and the positive input terminal of comparator 302, the other end ground connection of compensating network, the output signal of the negative input end input sawtooth waveforms generation module 303 of comparator 302; The mean value of 301 pairs of primary current sampled signals of electric current loop and current reference circuit for generating Iref compare, the error of the two is amplified output through electric current loop 301, the sawtooth signal that the error amplification signal of 302 pairs of electric current loops of comparator, 301 outputs and sawtooth waveforms generation module 303 produce compares, the sawtooth waveforms amplitude that is higher than the sawtooth signal generation of sawtooth waveforms generation module 303 generations when the error amplification signal amplitude of electric current loop 301 outputs, comparator 302 output high level, be lower than the sawtooth waveforms amplitude of the sawtooth signal generation of sawtooth waveforms generation module 303 generations when the error amplification signal amplitude of electric current loop 301 outputs, comparator 302 output low levels.
Switching tube conducting control module 400 can adopt as shown in figure 13 clocked flip-flop, is applicable to fixed-frequency control, and wherein clocked flip-flop belongs to this professional skill field known technology.
Switching tube conducting control module 400 can adopt as shown in figure 14 circuit, be applicable to critical discontinuous mode, wherein zero passage detection 501 inputs embody secondary diode current flow time detecting end Idet, the zero passage detection signal that output is anti-phase with test side Idet, time delay process 502 is used for compensating the error between secondary diode current zero crossing and the former limit switching tube Valley-Switching, to realize former limit switching tube Valley-Switching, zero passage detection 501 can realize with conventional comparator, belong to this professional skill field known technology.
Figure 15 is a specific embodiment of output diode ON time detection module 200, comprises comparator 201, biasing benchmark 202, inverter 203, rest-set flip-flop 204 and XOR gate 205.An input signal Idet of the positive input termination output diode ON time detection module 200 of comparator 201 wherein, the negative input termination biasing benchmark 202 of comparator 201, the input of the output termination inverter 203 of comparator 201, the output of inverter 203 connects respectively the R end (reset terminal) of rest-set flip-flop 204 and an input of XOR gate 205, the S end (set end) of rest-set flip-flop 204 meets another input signal Vg of output diode ON time detection module 200, the output Q output Vtoff1 of rest-set flip-flop 204.The key waveforms of output diode ON time detection module 200 embodiment shown in Figure 15 when led driver is operated in discontinuous current as shown in figure 16, wherein VIdet is the waveform of input Idet input Idet when connecing the auxiliary winding different name end of main circuit; V201 is the output waveform of comparator 201; V203 is the output waveform signals of inverter 203; Vg is the former limit of main circuit switching tube gate electrode drive signals; V204 is the output waveform signals of rest-set flip-flop 204; Vtoff1 is the output signal of XOR gate 205.Can find out from waveform shown in Figure 16, output diode ON time detection module shown in Figure 15 can detect the interval of the auxiliary winding different name end high level of main circuit, thereby it is interval roughly to detect main circuit output diode ON time.
Figure 17 is the specific embodiment that the high power factor constant current switching power source control circuit of the former limit control that consists of of Fig. 9 and primary current reference generating circuit of the present invention shown in Figure 11 is applied to the inverse-excitation type constant-current switch power source, and wherein inverse-excitation type switch power-supply is operated in continuous current mode, discontinuous mode or critical discontinuous mode.Inverse-excitation type switch power-supply comprises: inverse-excitation type main circuit and control circuit, wherein, described main circuit comprises interchange input 10, controllable silicon dimmer 11, rectifier bridge 12, input capacitance 13, rectifier bridge voltage waveform sample circuit 14, transformer 15, former limit switching tube 16, sampling resistor 17, output diode 18 and output capacitance 19; Circuit connecting relation is as follows: exchange input 10 connects rectifier bridge 12 through controllable silicon dimmer 11 two inputs, one end of the positive output termination input capacitance 13 of rectifier bridge 12, the Same Name of Ends of one end of rectifier bridge voltage waveform sample circuit 14 and transformer 15 former limit windings, the negative output terminal ground connection of rectifier bridge 12, the other end ground connection of input capacitance 12, the rectifier bridge voltage waveform signal test side Idet of the other end connection control circuit of rectifier bridge voltage waveform sample circuit 14, the drain electrode of the former limit of the different name termination switching tube 16 of the former limit winding of transformer 15, the source electrode of former limit switching tube 16 meets an end of sampling resistor 17 and the primary current sampling end Isen of control circuit, the other end ground connection of sampling resistor 16, the drive end Drv of the gate pole connection control circuit of former limit switching tube 16, the anode of the different name termination output diode 18 of the secondary winding of transformer 15, the negative electrode of output diode 18 connects the positive pole of output capacitance 19, the Same Name of Ends of the secondary winding of transformer 15 links to each other with the negative pole of output capacitance 19, the Same Name of Ends ground connection of the auxiliary winding of transformer 15, the output diode ON time test side Idet of the different name termination control circuit of the auxiliary winding of transformer 15.
Figure 18 is the specific embodiment that the high power factor constant current switching power source control circuit of the former limit control that consists of of Figure 10 and primary current reference generating circuit of the present invention shown in Figure 12 is applied to the inverse-excitation type constant-current switch power source, and wherein inverse-excitation type switch power-supply is operated in discontinuous mode or critical discontinuous mode.Inverse-excitation type switch power-supply comprises: inverse-excitation type main circuit and control circuit, wherein, described main circuit comprises interchange input 10, controllable silicon dimmer 11, rectifier bridge 12, input capacitance 13, rectifier bridge voltage waveform sample circuit 14, transformer 15, former limit switching tube 16, sampling resistor 17, output diode 18 and output capacitance 19; Circuit connecting relation is as follows: exchange input 10 connects rectifier bridge 12 through controllable silicon dimmer 11 two inputs, one end of the positive output termination input capacitance 13 of rectifier bridge 12, the Same Name of Ends of one end of rectifier bridge voltage waveform sample circuit 14 and transformer 15 former limit windings, the negative output terminal ground connection of rectifier bridge 12, the other end ground connection of input capacitance 12, the rectifier bridge voltage waveform signal test side Idet of the other end connection control circuit of rectifier bridge voltage waveform sample circuit 14, the drain electrode of the former limit of the different name termination switching tube 16 of the former limit winding of transformer 15, the source electrode of former limit switching tube 16 meets an end of sampling resistor 17 and the primary current sampling end Isen of control circuit, the other end ground connection of sampling resistor 16, the drive end Drv of the gate pole connection control circuit of former limit switching tube 16, the anode of the different name termination output diode 18 of the secondary winding of transformer 15, the negative electrode of output diode 18 connects the positive pole of output capacitance 19, and the Same Name of Ends of the secondary winding of transformer 15 links to each other with the negative pole of output capacitance 19.
The concrete module that the present invention includes, those skilled in the art can under the prerequisite of its spirit, can have numerous embodiments, or by various compound mode, form different specific embodiments, for example multiplication module can realize with switch combination, is not described in detail here.
No matter above how detailed explanation is, can have in addition many modes to implement the present invention, and such as numeral control etc., described in the specification is an implementation example of the present invention.All equivalent transformations that Spirit Essence is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
The above-mentioned detailed description of the embodiment of the invention be not exhaustive or be used for limiting the present invention to above-mentioned clear and definite in form.Above-mentioned with schematic purpose specific embodiment of the present invention and example are described in, those skilled in the art will recognize that and can carry out within the scope of the invention various equivalent modifications.
At above-mentioned declarative description specific embodiment of the present invention and having described in the anticipated optimal set pattern, no matter how detailed explanation appearred hereinbefore, also can be implemented in numerous ways the present invention.The details of foregoing circuit structure and control mode thereof is carried out in the details at it can carry out considerable variation, yet it still is included among the present invention disclosed herein.
Should be noted that as described above employed specific term should not redefine this term here with restriction of the present invention some certain features, feature or the scheme relevant with this term for being illustrated in when explanation some feature of the present invention or scheme.In a word, should be with the terminological interpretation in the claims of enclosing, used for not limiting the invention to disclosed specific embodiment in the specification, unless above-mentioned detailed description part defines these terms clearly.Therefore, actual range of the present invention not only comprises the disclosed embodiments, also is included in to implement or carry out all equivalents of the present invention under claims.
Claims (8)
1. the primary current reference generating circuit of high power factor constant current Switching Power Supply, comprise angle of flow testing circuit, the first multiplier, the second multiplier and electric current loop, it is characterized in that: an input of the first multiplier is as an input of primary current reference generating circuit, the input of angle of flow testing circuit is as another input of primary current reference generating circuit, output is connected with another input of the first multiplier, the output of the first multiplier is as an input of electric current loop, another input of electric current loop is as another input of primary current reference generating circuit, the output of electric current loop is connected with an input of the second multiplier, another input of the second multiplier is connected with the input of angle of flow testing circuit, and the output of the second multiplier is as the output of primary current reference generating circuit.
2. primary current reference generating circuit according to claim 1, it is characterized in that: described electric current loop comprises input resistance, operational amplifier and compensating network, one end of input resistance is as an input of electric current loop, the negative input of another termination operational amplifier, the positive input of operational amplifier is as another input of electric current loop, the output of operational amplifier is as the output of electric current loop, one end of compensating network is connected with the negative input of operational amplifier, and the other end of compensating network is connected with the output of operational amplifier.
3. primary current reference generating circuit according to claim 1, it is characterized in that: described electric current loop comprises input resistance, operational amplifier and compensating network, one end of input resistance is as an input of electric current loop, the negative input of another termination operational amplifier, the positive input of operational amplifier is as another input of electric current loop, the output of operational amplifier is as the output of electric current loop, one end of compensating network is connected with the output of operational amplifier, the other end ground connection of compensating network.
4. according to claim 1,2 or 3 described primary current reference generating circuits, it is characterized in that: also comprise the first filter and the second filter, the input of the first filter is as the input of primary current reference generating circuit, the output of the first filter is connected with an input of the first multiplier, the input of the second filter is as the input of primary current reference generating circuit, and the output of the second filter is connected with an input of electric current loop.
5. primary current reference generating circuit according to claim 4, it is characterized in that: also comprise the 3rd filter and the 3rd multiplier, the input of the 3rd filter is as primary current reference generating circuit input, the output of the 3rd filter is connected with an input of the 3rd multiplier, another input of the 3rd multiplier is connected with the output of the second filter, and the output of the 3rd multiplier is as an input of electric current loop.
6. primary current reference generating circuit according to claim 5, it is characterized in that: the position of the 3rd filter can change, the input of the 3rd filter is connected with the output of the 3rd multiplier after the change, the output of the 3rd filter is as an input of electric current loop, and an input of the 3rd multiplier is as the input of primary current reference generating circuit.
7. utilize the method that produces the primary current benchmark such as each described primary current reference generating circuit in the claim 1 to 4 to be:
7-1. obtain the mean value of the primary current of Switching Power Supply main circuit
7-2. obtain the switching tube driving pulse duty cycle signals D of Switching Power Supply main circuit;
7-3. obtain the signal alpha of the thyristor operating angle of reflection Switching Power Supply main circuit;
7-4. by control so that
Mean value be steady state value K, and obtain
And the error amplification signal Verror between K * D * α mean value;
7-5. obtain the commutating voltage waveform signal Iac of the rectifier bridge output of Switching Power Supply main circuit;
7-6. the error amplification signal Verror of step 7-4 acquisition and the voltage waveform signal Iac of step 7-5 acquisition are multiplied each other, produce primary current benchmark Iref.
8. utilize the method such as claim 5 or primary current reference generating circuit claimed in claim 6 generation primary current benchmark to be:
8-1. obtain the mean value of the primary current of Switching Power Supply main circuit
8-2. obtain the switching tube driving pulse ON time signal Ton of reflection Switching Power Supply main circuit;
8-3. obtain the output diode ON time signal Toff1 of reflection Switching Power Supply main circuit;
8-4. obtain the signal alpha of the thyristor operating angle of reflection Switching Power Supply main circuit;
8-5. by control so that
Mean value be steady state value K, and obtain
And the error amplification signal Verror between K * Ton * α mean value;
8-6. obtain the commutating voltage waveform signal Iac of the rectifier bridge output of Switching Power Supply main circuit;
8-7. the error amplification signal Verror of step 8-5 acquisition and the voltage waveform signal Iac of step 8-6 acquisition are multiplied each other, produce primary current benchmark Iref.
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| CN2011101110791A CN102186292B (en) | 2011-04-30 | 2011-04-30 | Primary edge current reference generating circuit and method for high power factor constant-current switch power supply |
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| CN2011101110791A CN102186292B (en) | 2011-04-30 | 2011-04-30 | Primary edge current reference generating circuit and method for high power factor constant-current switch power supply |
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| CN102186292B true CN102186292B (en) | 2013-09-18 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102355136B (en) * | 2011-09-30 | 2013-10-02 | 浙江大学 | Control method and control circuit for controlling output current of converter |
| CN102497711B (en) * | 2011-12-31 | 2015-12-16 | 杭州士兰微电子股份有限公司 | LED drive circuit and comprise the Switching Power Supply of this drive circuit |
| CN103683894B (en) * | 2012-08-31 | 2017-12-26 | 欧司朗股份有限公司 | Circuit of power factor correction and the driver comprising the circuit of power factor correction |
| JP2014064393A (en) * | 2012-09-21 | 2014-04-10 | Sanken Electric Co Ltd | Switching power supply device |
| WO2014170976A1 (en) * | 2013-04-17 | 2014-10-23 | 三菱電機株式会社 | Switching power supply circuit and control method therefor |
| CN103516182B (en) * | 2013-09-16 | 2016-04-20 | 浙江大学 | Be applied to the current observer of switching converter |
| CN104320879A (en) * | 2014-10-24 | 2015-01-28 | 苏州经贸职业技术学院 | Effective LED drive circuit capable of automatically correcting power factors |
| CN106131999B (en) * | 2016-06-23 | 2020-11-03 | 宁波芯辰微电子有限公司 | Constant current output circuit and method of LED driving power supply |
| CN112271919B (en) * | 2020-11-06 | 2021-09-21 | 上海儒竞智控技术有限公司 | Current compensation method, medium and current compensation device based on power factor correction |
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| CN201477463U (en) * | 2009-06-03 | 2010-05-19 | Bcd半导体制造有限公司 | Circuit in switch power supply for controlling constant-current output |
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| US7099163B1 (en) * | 2005-11-14 | 2006-08-29 | Bcd Semiconductor Manufacturing Limited | PWM controller with constant output power limit for a power supply |
| CN201477463U (en) * | 2009-06-03 | 2010-05-19 | Bcd半导体制造有限公司 | Circuit in switch power supply for controlling constant-current output |
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