CN102013882A - Oscillator and switching power supply control system using same - Google Patents
Oscillator and switching power supply control system using same Download PDFInfo
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- CN102013882A CN102013882A CN2009101901165A CN200910190116A CN102013882A CN 102013882 A CN102013882 A CN 102013882A CN 2009101901165 A CN2009101901165 A CN 2009101901165A CN 200910190116 A CN200910190116 A CN 200910190116A CN 102013882 A CN102013882 A CN 102013882A
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Abstract
The invention relates to an oscillator and a switching power supply control system using the same. The oscillator comprises a duty ratio detection module (100), a mirror current module (200) and an output voltage suppression module (300), wherein the duty ratio detection module (100) is used for acquiring the condition of the duty ratio of a main power tube to acquire the change situation of an input voltage; the mirror current module (200) is used for generating a mirror current according to the change situation of the input voltage; and the output voltage suppression module (300) is used for receiving the mirror current and generating an oscillator frequency which changes along with the input voltage based on the mirror current. By implementing the oscillator, the oscillator which has a high power supply rejection ratio and a low influence of an output voltage on an output current can be provided; and by using the oscillator for the switching power supply control system, the switching power supply control system has the high power supply rejection ration and the low influence of the output voltage on the output current is provided.
Description
Technical field
The present invention relates to oscillating circuit, more particularly, relate to a kind of oscillator and use the Switching Power Supply control system of described oscillator.
Background technology
Oscillator is the important component part of Switching Power Supply control chip, and Fig. 1 shows the magnetic hysteresis Current Control LED drive principle schematic diagram that prior art uses fixed oscillator to constitute.Produce a fixing operating frequency by the oscillator of control module, be used for beginning in each cycle power MOS pipe Q
1Open inductance L
1On electric current with
Rate of change increase, the electric current on inductance increases to and makes R
1On voltage surpass the reference voltage V of control module inner setting
TH, control module will be at once metal-oxide-semiconductor Q
1Close.After metal-oxide-semiconductor was closed, inductive current passed through sustained diode
1Flow to V
IN, form to fall after rise, the electric current on the inductance will with
Rate of change reduce, inductive current changes as shown in Figure 2.Inductive current constantly reduces up to the next cycle chip Q
1Open, induction charging repeats above action.Because the LED string is connected in series with inductance, so can reach the purpose of control output LED electric current by the average current of control inductance.
The LED drive system output current power supply that is made of the steady job frequency oscillator is that the LED average current is:
T wherein
dBe the time of delay owing to control chip, T is that the switch periods of system is the oscillator work period.I among Fig. 2
Set=V
TH/ R
1,
Be the overshoot current that causes owing to time-delay.Can see that the LED electric current is subjected to V
TH, R
1, V
In, V
Out, T
d, L
1Common influence with T.To (1) formula differentiate and to make it be 0, obtain working as Vin=Vin,
Electric current is obtained minimum value, Vin＜Vin, and during m, electric current reduces with the increase of Vin, and at Vin＞Vin, during m, output current increases with Vin.
For a specific system, V
CS, R
1, V
Out, T
d, L
1With T be that the amount that does not change in time or change can be ignored.Yet, be the bigger direct voltage of ripple voltage, and, cause output current to change with the variation of input voltage along with the difference of territory of use has than big-difference because power supply Vin generally obtains by AC rectification filtering.
Therefore, need a kind of Power Supply Rejection Ratio height, output current is subjected to output voltage to influence little oscillator and Switching Power Supply control system.
Summary of the invention
The technical problem to be solved in the present invention is, it is bigger influenced by input voltage at the output current of the Switching Power Supply control system of prior art, the defective of unstable properties, a kind of Power Supply Rejection Ratio height is provided, output current is subjected to output voltage to influence little oscillator, and this oscillator is used for the Switching Power Supply control system, thus a kind of Power Supply Rejection Ratio height is provided, output current is subjected to output voltage to influence little Switching Power Supply control system.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of oscillator, comprising:
The duty ratio detection module is used to detect the duty ratio situation of main power tube to obtain the input voltage situation of change;
The image current module is used for generating image current according to described input voltage situation of change;
Output voltage suppresses module, is used to receive and produces the frequency of oscillation that changes with input voltage based on described image current.
In oscillator of the present invention, described duty ratio detection module comprises first resistance, first diode; Gate pole, the other end that one end of wherein said first resistance is connected to main power tube is connected to the negative electrode of described first diode, and the anode of described first diode is connected to the output of described duty ratio detection module.
In oscillator of the present invention, described frequency of oscillation increases along with the increase of input voltage.
In oscillator of the present invention, described duty ratio detection module comprises: the first transistor and second resistance, the gate pole of wherein said the first transistor are connected to the source ground of the gate pole of main power tube, described the first transistor, drain electrode is connected to described duty ratio detection module through second resistance output.
In oscillator of the present invention, described frequency of oscillation reduces along with the increase of input voltage.
In oscillator of the present invention, described image current module comprises: operational amplifier, voltage-regulation transistor and image current device; The positive input of wherein said operational amplifier and described voltage-regulation transistor drain are connected to the output of described duty ratio detection module, the reverse input end of described operational amplifier is connected to first reference voltage, the output of described operational amplifier is connected to the gate pole of transistorized gate pole of described voltage-regulation and image current device, the source electrode of transistorized source electrode of described voltage-regulation and image current device is connected to power supply, and the drain electrode of described image current device is connected to the input that described output voltage suppresses module.
In oscillator of the present invention, described output voltage suppresses module and comprises frequency setting resistance, frequency setting electric capacity, reset transistor, comparator, monostable flipflop and reverser, wherein said frequency setting resistance is connected between the output and ground of described duty ratio detection module, between the input and ground that are connected to described output voltage inhibition module of described frequency setting electric capacity, the drain electrode of described reset transistor is connected to the output of described duty ratio detection module, source ground, gate pole is connected between the input of the output of described steady state trigger and reverser, the reverse input end of described comparator is connected to the output of described duty ratio detection module, positive input is connected to second reference voltage, output is connected to the input of monostable flipflop, the output of described monostable flipflop is to the input of described reverser, and the output of the output of described reverser is with the frequency of oscillation of input voltage variation.
In oscillator of the present invention, described voltage-regulation transistor and image current device are the PMOS pipes, and described reset transistor is the NMOS pipe.
Another technical scheme that the present invention solves its technical problem employing is, construct a kind of Switching Power Supply control system, comprise the main power tube and the output module that links to each other with described main power tube of control module, reception input voltage and opening and closing under the control of described control module, described control module comprises above-mentioned arbitrary oscillator.
In Switching Power Supply control system of the present invention, further comprise the direct voltage input module, be used for converting AC-input voltage to DC input voitage to offer described main power tube; The output voltage of wherein said output module changes according to the time with input voltage, thereby has realized frequency jitter.
In Switching Power Supply control system of the present invention, described Switching Power Supply control system is that PWM and PFM mix control model.
Implement the present invention, a kind of Power Supply Rejection Ratio height can be provided, and output current is subjected to output voltage to influence little oscillator, and this oscillator is used for the Switching Power Supply control system, thereby a kind of Power Supply Rejection Ratio height is provided, and output current is subjected to output voltage to influence little Switching Power Supply control system.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the magnetic hysteresis Current Control LED drive principle schematic diagram that prior art is made of fixed oscillator;
Fig. 2 is the inductive current waveform of prior art magnetic hysteresis current control mode;
Fig. 3 is the theory diagram of first embodiment of oscillator of the present invention;
Fig. 4 is the circuit theory diagrams of second embodiment of oscillator of the present invention;
Fig. 5 is Vc under the different Vin situations among Fig. 4, the voltage oscillogram of OSC and GATE;
Fig. 6 is the circuit theory diagrams of the 3rd embodiment of oscillator of the present invention;
Fig. 7 is the theory diagram of Switching Power Supply control system of the present invention.
Embodiment
Fig. 3 is the theory diagram of first embodiment of oscillator of the present invention.The maximum difference of the oscillator of it and traditional constant output frequency is, its output frequency and system's input voltage exist certain for concerning that this oscillator of rational Application can be so that the Power Supply Rejection Ratio of LED driving power source system be greatly enhanced.
As shown in Figure 3, oscillator of the present invention comprises duty ratio detection module 100, is used to detect the duty ratio situation of main power tube to obtain the input voltage situation of change; Image current module 200 is used for generating image current and output voltage suppresses module 300 according to described input voltage situation of change, is used to receive and produces the frequency of oscillation that changes with input voltage based on described image current.Duty ratio detection module of the present invention, image current module and output voltage suppress module and can adopt following example to be combined by the integrated circuit of discrete component, specific function, the processor that has suitable software and similar device.
Fig. 4 is the circuit theory diagrams of second embodiment of oscillator of the present invention.As shown in Figure 4, one end of resistance R 2 is connected to the gate pole of main power tube, the other end is connected to the negative electrode of diode D1, and the anode of described diode D1 is connected to Node B, thereby obtains the situation of change of system's input voltage vin by the output duty cycle situation that detects GATE.Make the output frequency of oscillator that corresponding the variation be taken place by the size that changes mirror image I2 then, counteracting Vin changes the influence to output current.
As shown in Figure 4, the drain electrode of the positive input of operational amplifier 301 and voltage-regulation PMOS pipe 302 is connected in node NodeB.The reverse input end of operational amplifier 301 meets reference voltage Vr, the grid of output and voltage-regulation PMOS pipe 302 is connected in NodeA, and the effect of operational amplifier 301 and voltage-regulation PMOS pipe 302 is that the feedback by operational amplifier 301 makes the voltage of NodeB equal Vr.The source electrode of voltage-regulation PMOS pipe 302 connects power supply Vdd, and grid connects NodeA, and drain electrode connects NodeB.The source electrode of the source electrode of image current device 303 and voltage-regulation PMOS pipe 302 is connected in Vdd, and grid connects NodeA, and drain electrode is connected in Vc.Duty ratio detects the grid G ATE that resistance 304 1 ends connect main power tube (this is not shown, referring to the Q1 among Fig. 1), and an other end connects the negative electrode of switching diode 305.The anode of switching diode 305 connects NodeB, and negative electrode is connected with an end of resistance 304.One end of frequency setting resistance 306 connects NodeB, and the other end connects ground; One end of frequency setting electric capacity 307 connects Vc, and the other end connects ground; The drain electrode of the NMOS that resets pipe 308 connects Vc, and the source end connects ground, and grid connects OSC_B.The positive input of comparator 309 connects Vc, and reverse input end connects reference voltage Vref, and output connects the input of monostable flipflop 310.The output of the input termination comparator 309 of monostable flipflop 310, output connects OSC_B.The input termination OSC_B of reverser 311, output termination OSC.
Below in conjunction with Fig. 5 the principle of the embodiment shown in Fig. 4 is described.When the level of OSC rises to high level from low level, the gate voltage of main power tube is that node GATE transfers high level to from low level, diode 305 ends, this moment, the size of I1 was Vr/R1, obtain I2=I1=Vr/R1 through current mirror device 303 mirror images, the voltage of electric capacity 307 rises with the rate of change of I2/C1.When GATE voltage drops to low level from high level, diode 305 conductings, the size of I1 becomes Vr/R1+ (Vr-Vd)/R2, and wherein Vd is the forward conduction voltage drop of diode 305, so the voltage rate of rise of electric capacity 307 becomes [Vr/R1+ (Vr-Vd)/R2]/C1 at this moment; When electric capacity 307 voltage Vc voltages rise to Vref, comparator 309 outputs transfer high level to from low level.Monostable flipflop 310 receives comparator high level output back output and is transformed into high level from low level, and this high level is opened the metal-oxide-semiconductor 308 that resets, and electric capacity 307 discharges make Vc voltage drop to ground level rapidly after metal-oxide-semiconductor 308 conductings that reset.The output of comparator 309 becomes low level from high level at once, so it is the lasting high level time of Tlow by the size that its inner parameter determines that monostable flipflop 310 can only be exported a duration, after this time, the output voltage of OSC_B reverts to low level.Correspondingly, the output OSC of reverser 311 has experienced output level and has transferred to lowly from height, continues Tlow is converted to high level again after the time process.Fig. 5 illustrates among Fig. 4 Vc under the different Vin situations, the voltage oscillogram of OSC and GATE.Generally, Tlow compares and can ignore with the switch periods T of system, and this moment, the output frequency of oscillator was determined by following equation
D×T×S1+(1-D)×T×S2＝Vref (2)
The duty ratio of switch when wherein D is system stability work also is the duty ratio of GATE output.In the magnetic hysteresis current control mode LED of the prior art shown in Fig. 1 drive system, D=Vout/Vin; T is the system switching cycle, i.e. oscillator output cycle, the voltage rate of rise of Vc when S1 is GATE output high level, S1=I2/C1, the voltage rate of rise of Vc when S2 is the GATE output low level, S2=[Vr/R1+ (Vr-Vd)/R2]/C1, solving an equation 2 obtains
Because S2＞S1, so along with the increase of Vin, D reduces, T reduces, and has compensated in (1) formula the 3rd variation, makes output current reduce with the variation of input voltage.But Vout is hour, first its leading role in (1) formula, and output current increases with the increase of input voltage.
Fig. 6 is the circuit theory diagrams of the 3rd embodiment of oscillator of the present invention.As shown in Figure 6, the embodiment shown in itself and Fig. 4 is roughly the same, and its difference is that its duty ratio detection module comprises transistor Q1 and resistance R 2.The gate pole of wherein said transistor Q1 is connected to the gate pole, grounded drain, source electrode of main power tube through resistance R 2 output duty cycle testing results.Embodiment shown in its operation principle and Fig. 4 is similar substantially, its difference is, the output frequency of this oscillator is less with the increase of input voltage, use in (1) formula the 3rd reduce to offset first increase, make output current reduce with the variation of input voltage.
Those skilled in the art can select different oscillator structure of the present invention to be applied to can greatly improve the Power Supply Rejection Ratio of output current in the magnetic hysteresis Current Control LED drive system according to the needs of actual output voltage, improve the precision of system's output current greatly.
Fig. 7 is the theory diagram of Switching Power Supply control system of the present invention.As shown in Figure 7, Switching Power Supply control system of the present invention can comprise control module 10, receive the main power tube 20 and the output module 30 that links to each other with described main power tube of input voltage and opening and closing under the control of described control module, can comprise arbitrary above-mentioned oscillator in the wherein said control module 10.Those skilled in the art know that Switching Power Supply control system of the present invention can make up according to the known any Switching Power Supply control system of prior art.In one embodiment of the invention, can make up with reference to Fig. 1.
In a preferred embodiment of the invention, this Switching Power Supply control system can further comprise direct voltage input module 40, is used for converting AC-input voltage to DC input voitage to offer described main power tube.Because the DC power supply that the direct voltage input module provides is obtained by the AC power rectification, its output voltage changes in time, so the operating frequency of Switching Power Supply control system of the present invention also changes in time, realize frequency jittering function simply, reduced the cost of the EMI of system filter circuit.
In addition, Switching Power Supply control system of the present invention has become from pwm pattern shown in Figure 1, PWM and PFM mix control model, can still can steady operation in greater than the condition of work of 50% duty ratio in the system that makes under the situation that does not increase the electric current slope equalizer.
Utilize oscillator of the present invention or Switching Power Supply control system can improve the Switching Power Supply control system
The electric current rejection ratio reduces the cost of electromagnetic interface filter, increases the duty cycle range of PWM control system,
Other PWM switch power supply systems application are also had value, and be particularly suitable for the LED drive system.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (10)
1. an oscillator is characterized in that, comprising:
Duty ratio detection module (100) is used to detect the duty ratio situation of main power tube to obtain the input voltage situation of change;
Image current module (200) is used for generating image current according to described input voltage situation of change;
Output voltage suppresses module (300), is used to receive and produces the frequency of oscillation that changes with input voltage based on described image current.
2. oscillator according to claim 1 is characterized in that, described duty ratio detection module (100) comprises first resistance, first diode; Gate pole, the other end that one end of wherein said first resistance is connected to main power tube is connected to the negative electrode of described first diode, and the anode of described first diode is connected to the output of described duty ratio detection module (100).
3. oscillator according to claim 2 is characterized in that described frequency of oscillation increases along with the increase of input voltage.
4. oscillator according to claim 1, it is characterized in that, described duty ratio detection module (100) comprising: the first transistor and second resistance, the gate pole of wherein said the first transistor are connected to the source ground of the gate pole of main power tube, described the first transistor, drain electrode is connected to described duty ratio detection module (100) through second resistance output.
5. oscillator according to claim 4 is characterized in that described frequency of oscillation reduces along with the increase of input voltage.
6. oscillator according to claim 1 is characterized in that, described image current module (200) comprising: operational amplifier, voltage-regulation transistor and image current device; The positive input of wherein said operational amplifier and described voltage-regulation transistor drain are connected to the output of described duty ratio detection module (100), the reverse input end of described operational amplifier is connected to first reference voltage, the output of described operational amplifier is connected to the gate pole of transistorized gate pole of described voltage-regulation and image current device, the source electrode of transistorized source electrode of described voltage-regulation and image current device is connected to power supply, and the drain electrode of described image current device is connected to the input that described output voltage suppresses module (300).
7. oscillator according to claim 1, it is characterized in that, described output voltage suppresses module (300) and comprises frequency setting resistance, frequency setting electric capacity, reset transistor, comparator, monostable flipflop and reverser, wherein said frequency setting resistance is connected between the output and ground of described duty ratio detection module (100), between the input and ground that are connected to described output voltage inhibition module (300) of described frequency setting electric capacity, the drain electrode of described reset transistor is connected to the output of described duty ratio detection module (100), source ground, gate pole is connected between the input of the output of described steady state trigger and reverser, the reverse input end of described comparator is connected to the output of described duty ratio detection module (100), positive input is connected to second reference voltage, output is connected to the input of monostable flipflop, the output of described monostable flipflop is to the input of described reverser, and the output of the output of described reverser is with the frequency of oscillation of input voltage variation.
8. Switching Power Supply control system, the main power tube (20) and the output module (30) that links to each other with described main power tube that comprise control module (10), reception input voltage and opening and closing under the control of described control module, it is characterized in that described control module (10) comprises as the described oscillator of arbitrary claim among the claim 1-7.
9. Switching Power Supply control system according to claim 8 is characterized in that, further comprises direct voltage input module (40), is used for converting AC-input voltage to DC input voitage to offer described main power tube;
The output voltage of wherein said output module (300) changes according to the time with input voltage, thereby has realized frequency jitter.
10. according to Claim 8 or 9 described Switching Power Supply control system, it is characterized in that described Switching Power Supply control system is that PWM and PFM mix control model.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684491A (en) * | 2011-05-10 | 2012-09-19 | 成都芯源系统有限公司 | Switching regulator and control circuit and control method thereof |
| CN103475189A (en) * | 2013-08-28 | 2013-12-25 | 中国航天科技集团公司第九研究院第七七一研究所 | Oscillator of PWM (pulse-width modulation) controller |
| CN105811770A (en) * | 2014-12-31 | 2016-07-27 | 立锜科技股份有限公司 | Control circuit of power adapter |
| CN110505729A (en) * | 2018-05-18 | 2019-11-26 | 华润矽威科技（上海）有限公司 | Improve the modulation circuit and its modulator approach of LED light modulation depth |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1725628A (en) * | 2004-07-23 | 2006-01-25 | 松下电器产业株式会社 | Voltage controlled oscillator |
-
2009
- 2009-09-08 CN CN2009101901165A patent/CN102013882B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684491A (en) * | 2011-05-10 | 2012-09-19 | 成都芯源系统有限公司 | Switching regulator and control circuit and control method thereof |
| CN103475189A (en) * | 2013-08-28 | 2013-12-25 | 中国航天科技集团公司第九研究院第七七一研究所 | Oscillator of PWM (pulse-width modulation) controller |
| CN103475189B (en) * | 2013-08-28 | 2015-11-18 | 中国航天科技集团公司第九研究院第七七一研究所 | A kind of oscillator of PWM controller |
| CN105811770A (en) * | 2014-12-31 | 2016-07-27 | 立锜科技股份有限公司 | Control circuit of power adapter |
| CN105811770B (en) * | 2014-12-31 | 2018-05-15 | 立锜科技股份有限公司 | The control circuit of power supply changeover device |
| CN110505729A (en) * | 2018-05-18 | 2019-11-26 | 华润矽威科技（上海）有限公司 | Improve the modulation circuit and its modulator approach of LED light modulation depth |
| CN110505729B (en) * | 2018-05-18 | 2021-11-30 | 华润微集成电路(无锡)有限公司 | Modulation circuit for improving LED dimming depth and modulation method thereof |
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| CN102013882B (en) | 2012-07-25 |
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