CN102307044A - Switching power supply PWM (pulse width modulation) controller with variable frequencies - Google Patents
Switching power supply PWM (pulse width modulation) controller with variable frequencies Download PDFInfo
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Abstract
The invention provides a switching power supply PWM (pulse width modulation) controller with variable frequencies, and the controller can be applied to the field of electronic circuits. The controller comprises a sawtooth wave generating circuit, a frequency control circuit and a PWM generator, wherein the output end of the PWM generator is connected with the input end of the frequency control circuit, the output end of the frequency control circuit is connected with the input end of the sawtooth wave generating circuit, and the output end of the sawtooth wave generating circuit is connected with the input end of the PWM generator. The duty ratio of PWM signals is used as a control signal of the frequency of the PWM signals and the direct current component of the PWM signals is extracted to control the sawtooth wave generating circuit, so that the changes of oscillation frequencies can be realized and the changes of the PWM signals can be further reached. Thus, the frequency of the PWM signals can be automatically changed according to the input and output conditions of the switching power supply, the power supply conversion efficiency under the different working conditions can be optimized, meanwhile, the problem of the unreliable drive of a pulse transformer can be solved when the duty cycle is very large.
Description
Technical field
The invention belongs to electronic circuit field, relate in particular to a kind of Switching Power Supply Pwm controller of changeable frequency.
Background technology
In the Switching Power Supply; The size of magnetic element is mainly determined by switching frequency and input, output condition; For inputing or outputing the very wide power supply of change in voltage scope; The design of its inductance usually with unsaturated under the harshest condition be foundation; And it is loose at input/output condition; Be input and output when differing very little, the design margin of inductance is just very big, causes the imbalance of volume and efficient.Switching Power Supply pulse width modulation control method through adopting switching frequency to change can be selected the more excellent inductance of sense value for use, improves power density and power-efficient.
For input, the wide isolated form topology of output voltage range, like forward topology, along with the variation of input, output voltage; When duty ratio is big; The exciting curent of transformer is also bigger, and is saturated in order to prevent, the former limit inductance value of transformer and magnetic core size all need bigger; And when duty ratio reduces, same inductance value and magnetic core size, it is saturated that transformer is difficult to, and suitably can reduce switching frequency this moment, with the lifting on the implementation efficiency.
For the non-isolation type topology of boosting, like the BOOST topology, when output voltage higher; When duty ratio is big; The ripple of inductive current is also bigger, and in order to satisfy index request, the design of inductance is reference with the ripple coefficient of this moment often; When the output voltage step-down; When duty ratio reduced, the inductive current ripple is corresponding to be reduced, but only need satisfy same ripple coefficient; Just the requirement that can touch the mark is so can reduce the optimization of switching frequency with implementation efficiency.
Also like this for the non-isolation type buck topology, like the BUCK topology, just the variation tendency of its switching frequency should be along with the increase of duty ratio and reduces.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of the embodiment of the invention is to provide a kind of Switching Power Supply Pwm controller of changeable frequency.
The embodiment of the invention is achieved in that a kind of Switching Power Supply Pwm controller of changeable frequency, and said controller comprises:
The saw-tooth wave generating circuit that frequency increases or reduces with control voltage, a frequency control circuit and a PWM generator,
The output of said PWM generator links to each other with the input of said frequency control circuit; The output of said frequency control circuit links to each other with the input of said saw-toothed wave generator, and the output of said saw-toothed wave generator links to each other with the input of said PWM generator.
Further, said controller also comprises:
The error amplifier that links to each other with the input of said PWM generator.
Further, said saw-tooth wave generating circuit comprises:
Timer, capacitor C 1003, power supply VCC, resistance R 1001, resistance R 1002, resistance R 1003, capacitor C 1001 and PNP triode Q1001,
Said resistance R 1001 and resistance R 1002 series connection; The base stage of triode Q1001 is connected to the series connection point of R1001 and R1002; Another termination frequency control signal 1007 of resistance R 1001; The emitter connecting resistance R1002 of Q1001; Another termination fixed power source voltage of R1002; The collector electrode of Q1001 connects capacitor C 1001; The high-triggering end of said timer, low triggering end and discharge end are received together; Receive the anode of capacitor C 1001 simultaneously; The anode of said voltage control termination capacitor C 1003, zero clearing termination supply voltage.
Further, said saw-tooth wave generating circuit 1200 comprises:
Timer, capacitor C 1203, power supply VCC, resistance R 1201, resistance R 1202, resistance R 1203, capacitor C 1201 and PNP triode Q1201,
Said resistance R 1201 and resistance R 1203 series connection; The base stage of triode Q1201 is connected to the series connection point of R1201 and R1203; Another termination timer of resistance R 1201; The emitter connecting resistance R1202 of Q1201, another termination frequency control circuit of R1202, the collector electrode of Q1201 connects capacitor C 1201; The high-triggering end of said timer, low triggering end and discharge end are received together; Receive the anode of capacitor C 1201 simultaneously, the anode of said voltage control termination capacitor C 1203, zero clearing termination supply voltage.
Further, said frequency control circuit comprises: resistance R 1006, resistance R 1004, resistance R 1005, capacitor C 1002 and operational amplifier U1001,
Resistance R 1006 is formed the RC filter circuit with capacitor C 1002, extract the dutyfactor value of pwm signal, and said resistance R 1006 links to each other with an end of capacitor C 1002, the in-phase input end of operational amplifier U1001 respectively, the other end ground connection of said capacitor C 1002;
Further, said error amplifier comprises: operational amplifier 1005 and offset peripheral circuit.
Further, said saw-tooth wave generating circuit comprises: resistance R 301, resistance R 302, resistance R 303, capacitor C 301, capacitor C 302, triode Q301, triode Q302, and timer and the power supply VCC that said elements is supplied power,
Said resistance R 301 1 ends are connected to the emitter-base bandgap grading of triode Q301; The other end is connected to an end of resistance R 303; The other end of said resistance R 303 is connected to the collector electrode of triode Q301; The base stage of said triode Q301 connects the base stage of triode Q302; The collector electrode of said triode Q302 connects an end and the timer of capacitor C 301 respectively, and said timer has also connected capacitor C 302.
Further, said saw-tooth wave generating circuit comprises: resistance R 501, resistance R 502, resistance R 503, capacitor C 501, capacitor C 502, triode Q501, triode Q502, timer and the power supply VCC that said elements is supplied power,
The emitter-base bandgap grading of said triode Q501 links to each other with resistance R 501; The collector electrode of said triode Q501 links to each other with capacitor C 501; The base stage of said triode Q501 connects the base stage of triode Q502; The collector electrode of said triode Q502 connects resistance R 503; The emitter-base bandgap grading of said triode Q502 connects an end of resistance R 502; The collector electrode of said resistance R 502, triode Q501 all is connected with timer, and said timer has also connected capacitor C 502.
Further, said saw-tooth wave generating circuit comprises: capacitor C 901, resistance R 901, resistance R 902, resistance R 903, resistance R 904, triode Q901, triode Q902 and comparator U901,
The emitter-base bandgap grading of said triode Q901 links to each other with resistance R 901; The collector electrode of said triode Q901 links to each other with capacitor C 901; The base stage of said triode Q901 is connected between resistance R 902 and the resistance R 903; The collector electrode of said triode Q902 is connected to the collector electrode of triode Q901; The emitter-base bandgap grading of said triode Q902 connects the other end of capacitor C 901; The collector electrode of said resistance R 902, triode Q901 all is connected with timer, and said timer has also connected capacitor C 902.
In an embodiment of the present invention, utilize the control signal of the dutyfactor value of pulse width modulating signal, extract the DC component of pwm signal as its frequency; The size of expression duty ratio; Control saw-tooth wave generating circuit, realize the variation of frequency of oscillation, reach the variation of pwm signal frequency.Like this, just can optimize the power supply conversion efficiency under the different operating modes according to the input of Switching Power Supply, the frequency that output condition changes pulse width modulating signal automatically, can solve simultaneously duty ratio when very big the pulse transformer drive insecure problem.
Description of drawings
Fig. 1 is the control principle of the Switching Power Supply pulse-width modulation method that changes of the Automatic Frequency that provides of the embodiment of the invention;
Fig. 2 is the realization schematic block diagram that the switching frequency that provides of the embodiment of the invention can self-adjusting pulse width modulation control method;
The circuit structure diagram of Fig. 3 saw-toothed wave generator that to be the frequency of oscillation that provides of first embodiment of the invention reduce with the increase of control voltage;
Fig. 4 is the simulation waveform figure of sweep-generation circuit shown in Figure 3;
The frequency of oscillation that Fig. 5 provides for second embodiment of the invention with control voltage reduce and the circuit structure diagram of the saw-toothed wave generator that reduces;
Fig. 6 is the simulation waveform figure of sweep-generation circuit shown in Figure 5;
Fig. 7 is frequency of oscillation shown in Figure 3 increases the saw-toothed wave generator that reduces with control voltage a simplification way of realization;
Fig. 8 is that frequency of oscillation shown in Figure 5 reduces with control voltage and the simplification way of realization of the saw-toothed wave generator that reduces;
Fig. 9 is the structure principle chart of the saw-toothed wave generator that provides of third embodiment of the invention;
Figure 10 is switching frequency increases the Switching Power Supply pulse width modulation control method that reduces with duty ratio a concrete realization circuit;
Figure 11 is the output waveform figure of the said Switching Power Supply Pwm controller of Figure 10;
Figure 12 is that switching frequency reduces with duty ratio and the concrete realization circuit of the Switching Power Supply pulse-width modulation method that reduces;
Figure 13 is the output waveform figure of the said Switching Power Supply Pwm controller of Figure 12.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The present invention relates to a kind of Switching Power Supply pulse width modulation control method and implementation thereof; It can change the frequency of pulse width modulating signal automatically according to input, output condition; Optimize the power supply conversion efficiency under the different operating modes, can solve simultaneously duty ratio when very big the pulse transformer drive insecure problem.The present invention utilizes the control signal of the dutyfactor value of pulse width modulating signal as its frequency, extracts the DC component of pwm signal, and the size of expression duty ratio is controlled saw-tooth wave generating circuit, realizes the variation of frequency of oscillation, reaches the variation of pwm signal frequency.
The present invention relates to a kind of switching frequency can self-adjusting pulse width modulation control method and implementation thereof; Change in the pwm signal of method slave controller output and extract duty cycle information, realize the increase or the reduction of frequency according to the size control saw-toothed wave generator of duty ratio.
Fig. 1 shows the control principle of the Switching Power Supply pulse-width modulation method of Automatic Frequency variation,
The output of PWM generator links to each other with frequency control circuit, and the output of said frequency control circuit links to each other with saw-toothed wave generator, and the output of said saw-toothed wave generator links to each other with said PWM generator.
The PWM generator output pwm signal; Frequency control circuit extracts the size of duty ratio from pwm signal; The output frequency control signal is given said saw-tooth wave generating circuit, thus the sawtooth waveforms frequency of control saw-tooth wave generating circuit, thus the corresponding change of pwm signal frequency of PWM generator output.
Fig. 2 shows the realization schematic block diagram that switching frequency can self-adjusting pulse width modulation control method,
201 is saw-toothed wave generator; Its frequency can change according to control signal; 202 is error amplifier; Error signal to power supply is carried out computing; Realize closed-loop stabilization, 203 is PWM generator, and its output signal and sawtooth signal with error amplifier compares; Produce pulse-width signal, the conducting through switching tube in drive circuit 205 control switching and closing.204 is the sketch map of voltage-frequency control circuit, and it produces the control signal of saw-toothed wave generator according to duty ratio of pwm signal size, realizes the increase of sawtooth waveforms frequency and reduces.
The circuit structure of the saw-tooth wave generating circuit of the changeable frequency that Fig. 3 provides for first embodiment of the invention, it utilizes the inherent characteristic of 555 timers to produce sawtooth waveforms.
Said saw-tooth wave generating circuit comprises: resistance R 301, resistance R 302, resistance R 303, capacitor C 301, capacitor C 302, triode Q301, triode Q302, timer and the power supply VCC that said elements is supplied power.Said resistance R 301 1 ends are connected to the emitter-base bandgap grading of triode Q301; The other end is connected to an end of resistance R 303; The other end of said resistance R 303 is connected to the collector electrode of triode Q301; The base stage of said triode Q301 connects the base stage of triode Q302; The collector electrode of said triode Q302 connects an end and the timer of capacitor C 301 respectively, and said timer has also connected capacitor C 302.
In Fig. 3, resistance R 301, resistance R 302, transistor Q301, transistor Q302 and resistance R 303 are formed current mirroring circuit, and capacitor C 301 is carried out constant current charge, make the terminal voltage of C301, and promptly the voltage linear at 303 places raises.305 is 555 timers; When the voltage when 303 surpasses the internal threshold of 555 timers; Its inner integrated triode conducting; Electric charge moment of C301 is released; Make 303 voltage reduce to zero; The inside triode of 555 timers is ended; Current mirror charges to C301 again; So produce sawtooth waveforms; The sawtooth wave frequency is by the decision of its voltage rate of rise, through changing 301 voltage, can change the electric current of current mirror; Thereby change the voltage rate of rise of sawtooth waveforms, realize change the sawtooth waveforms frequency.
Consult Fig. 3; Increase along with voltage Vf; 302 voltage also increases; By the principle of current mirror, 304 voltage also increases, and the electric current that flows through resistance R 304 reduces; The charging current that is capacitor C 301 reduces; Charge rate slows down, and then the sawtooth wave frequency reduces, thereby realizes that frequency reduces with the increase of control voltage.
See also Fig. 4, Fig. 4 is the simulation waveform of sweep-generation circuit shown in Figure 3, and n_408 is 301 waveform, and n_392 is 303 waveform, i.e. sawtooth waveforms output, and visible increase along with control voltage Vf, the switching frequency of sawtooth waveforms reduces.
See also Fig. 5, its sawtooth waveforms frequency increases with the increase of control voltage.Equally, it utilizes the inherent characteristic of 555 timers to produce sawtooth waveforms.
Said saw-tooth wave generating circuit comprises: resistance R 501, resistance R 502, resistance R 503, capacitor C 501, capacitor C 502, triode Q501, triode Q502, timer and the power supply VCC that said elements is supplied power,
The emitter-base bandgap grading of said triode Q501 links to each other with resistance R 501; The collector electrode of said triode Q501 links to each other with capacitor C 501; The base stage of said triode Q501 connects the base stage of triode Q502; The collector electrode of said triode Q502 connects resistance R 503; The emitter-base bandgap grading of said triode Q502 connects an end of resistance R 502; The collector electrode of said resistance R 502, triode Q501 all is connected with timer, and said timer has also connected capacitor C 502.
Wherein, resistance R 501, resistance R 502, transistor Q501, transistor Q502 and resistance R 503 are formed current mirroring circuit, and capacitor C 501 is carried out constant current charge, make the terminal voltage of C501, and promptly the voltage linear at 503 places raises.
Consult Fig. 5, along with the increase of voltage Vf, the voltage at resistance R 501 two ends also increases; The electric current that flows through resistance R 501 increases, and promptly the charging current of capacitor C 501 becomes big, and charge rate is accelerated; Then the sawtooth wave frequency improves, thereby realizes that frequency increases with the increase of control voltage.
See also simulation waveform shown in Figure 6, n_487 is 501 waveform, and n_392 is 503 waveform, i.e. sawtooth waveforms output, and visible reduction along with control voltage Vf, the switching frequency of sawtooth waveforms reduces.
Fig. 7 increases the simplification way of realization of the saw-toothed wave generator that reduces with control voltage for frequency of oscillation shown in Figure 3.
In this embodiment, said saw-tooth wave generating circuit comprises: resistance R 701, resistance R 702, resistance R 703, capacitor C 701, capacitor C 702, triode Q702, timer and the power supply VCC that said elements is supplied power.Said resistance R 701 1 ends are connected to the base stage of triode Q702; The other end is connected to an end of resistance R 703; The other end of said resistance R 703 is connected to the base stage of triode Q702; The collector electrode of said triode Q702 connects an end and the timer of capacitor C 701 respectively, and said timer has also connected capacitor C 702.Said capacitor C 701 other end ground connection.The end of the emitter-base bandgap grading connecting resistance R702 of said triode Q702, another termination timer of R702.
In the present embodiment, be on the basis of embodiment shown in Figure 3, to have used triode, i.e. a Q301 less.
Fig. 8 reduces with control voltage for frequency of oscillation shown in Figure 5 and the simplification way of realization of the saw-toothed wave generator that reduces.
In the present embodiment, said saw-tooth wave generating circuit comprises: resistance R 801, resistance R 802, resistance R 803, capacitor C 801, capacitor C 802, triode Q801, timer and the power supply VCC that said elements is supplied power,
The emitter-base bandgap grading of said triode Q801 links to each other with resistance R 801; The collector electrode of said triode Q801 links to each other with capacitor C 801; The base stage of said triode Q801 connects an end of resistance R 802, resistance R 803 respectively, and the collector electrode of said triode Q801 links to each other with capacitor C 801 and timer respectively.Another termination timer of said resistance R 802.The other end ground connection of said resistance R 803.Said timer has also connected capacitor C 802.
Present embodiment is on the basis of embodiment shown in Figure 5, reduces and has used a triode, i.e. Q502 among Fig. 5.
Fig. 9 is the another kind of implementation of saw-toothed wave generator.This saw-tooth wave generating circuit comprises: capacitor C 901, resistance R 901, resistance R 902, resistance R 903, resistance R 904, triode Q901, triode Q902 and comparator U901.
The emitter-base bandgap grading of said triode Q901 links to each other with resistance R 901; The collector electrode of said triode Q901 links to each other with capacitor C 901; The base stage of said triode Q901 is connected between resistance R 902 and the resistance R 903; The collector electrode of said triode Q902 is connected to the collector electrode of triode Q901; The emitter-base bandgap grading of said triode Q902 connects the other end of capacitor C 901; The collector electrode of said resistance R 902, triode Q901 all is connected with timer, and said timer has also connected capacitor C 902.
Through conducting and the shutoff of comparator U901 control switch pipe Q902, give charging capacitor C901 discharge, replace 555 timers, produce sawtooth waveforms, the amplitude of sawtooth waveforms is by the inverting input reference voltage decision of comparator U901.
Figure 10 increases the concrete implementation of the Switching Power Supply pulse width modulation control method that reduces with duty ratio for switching frequency.
Said saw-tooth wave generating circuit 1000 comprises: timer, capacitor C 1003, power supply VCC, resistance R 1001, resistance R 1002, resistance R 1003, capacitor C 1001 and PNP triode Q1001,
Said frequency control circuit 1001 comprises: resistance R 1006, resistance R 1004, resistance R 1005, capacitor C 1002 and operational amplifier U1001,
N_392 is the output of saw-toothed wave generator among Figure 11, i.e. 1004 waveform, n_556 are PWM output, i.e. 1006 waveform.
See also Figure 12, Figure 12 reduces with duty ratio for switching frequency and the concrete implementation of the Switching Power Supply pulse-width modulation method that reduces.
In the present embodiment, said saw-tooth wave generating circuit 1200 comprises:
Timer, capacitor C 1203, power supply VCC, resistance R 1201, resistance R 1202, resistance R 1203, capacitor C 1201 and PNP triode Q1201.
Present embodiment is different with circuit shown in Figure 10 to be, shown in Figure 10ly reduces for frequency increases with duty ratio.And being frequency, circuit shown in Figure 12 increases with duty ratio.Find expression in circuit, mainly be: the method that the connects difference of triode.
The output of n_392 saw-toothed wave generator among Figure 13, i.e. 1204 waveform, n_556 are PWM output, i.e. 1206 waveform.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the Switching Power Supply Pwm controller of a changeable frequency is characterized in that, said controller comprises:
The saw-tooth wave generating circuit that frequency increases or reduces with control voltage, a frequency control circuit and a PWM generator,
The output of said PWM generator links to each other with the input of said frequency control circuit; The output of said frequency control circuit links to each other with the input of said saw-toothed wave generator, and the output of said saw-toothed wave generator links to each other with the input of said PWM generator.
2. the Switching Power Supply Pwm controller of changeable frequency according to claim 1 is characterized in that, said controller also comprises:
The error amplifier that links to each other with the input of said PWM generator.
3. the Switching Power Supply Pwm controller of changeable frequency according to claim 1 is characterized in that, said saw-tooth wave generating circuit comprises:
Timer, capacitor C 1003, power supply VCC, resistance R 1001, resistance R 1002, resistance R 1003, capacitor C 1001 and PNP triode Q1001,
Said resistance R 1001 and resistance R 1002 series connection; The base stage of triode Q1001 is connected to the series connection point of R1001 and R1002; Another termination frequency control signal 1007 of resistance R 1001; The emitter connecting resistance R1002 of Q1001; Another termination fixed power source voltage of R1002; The collector electrode of Q1001 connects capacitor C 1001; The high-triggering end of said timer, low triggering end and discharge end are received together; Receive the anode of capacitor C 1001 simultaneously; The anode of said voltage control termination capacitor C 1003, zero clearing termination supply voltage.
4. the Switching Power Supply Pwm controller of changeable frequency according to claim 1 is characterized in that, said saw-tooth wave generating circuit 1200 comprises:
Timer, capacitor C 1203, power supply VCC, resistance R 1201, resistance R 1202, resistance R 1203, capacitor C 1201 and PNP triode Q1201,
Said resistance R 1201 and resistance R 1203 series connection; The base stage of triode Q1201 is connected to the series connection point of R1201 and R1203; Another termination timer of resistance R 1201; The emitter connecting resistance R1202 of Q1201, another termination frequency control circuit of R1202, the collector electrode of Q1201 connects capacitor C 1201; The high-triggering end of said timer, low triggering end and discharge end are received together; Receive the anode of capacitor C 1201 simultaneously, the anode of said voltage control termination capacitor C 1203, zero clearing termination supply voltage.
5. the Switching Power Supply Pwm controller of changeable frequency according to claim 1 is characterized in that, said frequency control circuit comprises: resistance R 1006, resistance R 1004, resistance R 1005, capacitor C 1002 and operational amplifier U1001,
Resistance R 1006 is formed the RC filter circuit with capacitor C 1002, extract the dutyfactor value of pwm signal, and said resistance R 1006 links to each other with an end of capacitor C 1002, the in-phase input end of operational amplifier U1001 respectively, the other end ground connection of said capacitor C 1002;
Resistance R 1004, resistance R 1005 and operational amplifier U1001 constitute in-phase amplifier; Frequency control signal is nursed one's health; And an end of said resistance R 1004, resistance R 1005 all is connected to the inverting input of operational amplifier U1001; The output of another termination operational amplifier U1001 of said resistance R 1004, the other end ground connection of said resistance R 1005.
6. the Switching Power Supply Pwm controller of changeable frequency according to claim 1 is characterized in that, said error amplifier comprises: operational amplifier 1005 and offset peripheral circuit.
7. the Switching Power Supply Pwm controller of changeable frequency according to claim 1; It is characterized in that; Said saw-tooth wave generating circuit comprises: resistance R 301, resistance R 302, resistance R 303, capacitor C 301, capacitor C 302, triode Q301, triode Q302; Timer and the power supply VCC that said elements is supplied power
Said resistance R 301 1 ends are connected to the emitter-base bandgap grading of triode Q301; The other end is connected to an end of resistance R 303; The other end of said resistance R 303 is connected to the collector electrode of triode Q301; The base stage of said triode Q301 connects the base stage of triode Q302; The collector electrode of said triode Q302 connects an end and the timer of capacitor C 301 respectively, and said timer has also connected capacitor C 302.
8. the Switching Power Supply Pwm controller of changeable frequency according to claim 1; It is characterized in that; Said saw-tooth wave generating circuit comprises: resistance R 501, resistance R 502, resistance R 503, capacitor C 501, capacitor C 502, triode Q501, triode Q502, timer and the power supply VCC that said elements is supplied power
The emitter-base bandgap grading of said triode Q501 links to each other with resistance R 501; The collector electrode of said triode Q501 links to each other with capacitor C 501; The base stage of said triode Q501 connects the base stage of triode Q502; The collector electrode of said triode Q502 connects resistance R 503; The emitter-base bandgap grading of said triode Q502 connects an end of resistance R 502; The collector electrode of said resistance R 502, triode Q501 all is connected with timer, and said timer has also connected capacitor C 502.
9. the Switching Power Supply Pwm controller of changeable frequency according to claim 1; It is characterized in that; Said saw-tooth wave generating circuit comprises: capacitor C 901, resistance R 901, resistance R 902, resistance R 903, resistance R 904, triode Q901, triode Q902 and comparator U901
The emitter-base bandgap grading of said triode Q901 links to each other with resistance R 901; The collector electrode of said triode Q901 links to each other with capacitor C 901; The base stage of said triode Q901 is connected between resistance R 902 and the resistance R 903; The collector electrode of said triode Q902 is connected to the collector electrode of triode Q901; The emitter-base bandgap grading of said triode Q902 connects the other end of capacitor C 901; The collector electrode of said resistance R 902, triode Q901 all is connected with timer, and said timer has also connected capacitor C 902.
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| CN111082659A (en) * | 2019-11-18 | 2020-04-28 | 合肥华耀电子工业有限公司 | Novel closed loop regulating circuit who possesses frequency modulation function |
| CN113054847A (en) * | 2019-12-27 | 2021-06-29 | 芯洲科技（北京）有限公司 | Direct current conversion circuit and circuit system |
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