CN107508452A - A kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation - Google Patents
A kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation Download PDFInfo
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- CN107508452A CN107508452A CN201710621823.XA CN201710621823A CN107508452A CN 107508452 A CN107508452 A CN 107508452A CN 201710621823 A CN201710621823 A CN 201710621823A CN 107508452 A CN107508452 A CN 107508452A
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- Prior art keywords
- pulse frequency
- drive circuit
- frequency modulation
- circuit
- method based
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation, belong to switch power technology.It is a kind of method that working method by the ripe Pwm controller SG1525 used is converted to pulse frequency modulated (PFM) by pulsewidth modulation (PWM).The thinking of the present invention is that the fundamental mode of pulse-width modulated controller is rationally applied, arrange in pairs or groups appropriate peripheral circuit, pulse frequency modulation drive circuit is realized using operational amplifier etc., the ripe general pulse width driving chip of this method application adds the Switching Power Supply pulse frequency modulation drive circuit that simple peripheral circuit is realized, the circuit greatly simplified, improve the reliability of circuit.
Description
Technical field
The present invention relates to switch power technology.
Background technology
Switching Power Supply has obtained extensive and universal application with advantages such as its small volume, efficiency high, light weights.Switching Power Supply
Control mode can be divided into two kinds of pulse width modulation (PWM) and pulse frequency modulated (PFM).Wherein, PWM control modes compare
Generally, majority is hard switching mode, and corresponding driving chip technology maturation model is more.And PFM controls are mainly Sofe Switch mode,
Sofe Switch has the characteristics that efficiency high, switch stress are small, has broader practice prospect, but in the market is rare ready-made
Special driving chip, thus power circuit designer needs the pulse frequency drive circuit of complex designing.
PWM controller SG1525 is converted to pulse frequency modulation by the present invention by the transformation of principle by pulsewidth modulation.
SG1525 chip applications extensively, technology maturation, be internally integrated PID regulator circuit, oscillator, frequency dividing circuit, drive circuit,
Protection circuit and auxiliary power circuit etc., these circuits have certain repetition in pulse width-frequency modulation(PFM) drive circuit
Property and workability, its working timing figure are as shown in Figure 1.
The content of the invention
Present disclosure is to provide a kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation.Such as Fig. 2 institutes
Show, arteries and veins frequency is realized using Pwm controller SG1525 as core, by supporting peripheral circuit of two feedback circuits
Modulation drive circuit.Sampling feedback computing circuit 1 controls error voltage the vibration of adjustment SG1525 controllers after scaling
Frequency, it is allowed to directly proportional to feedback voltage；The scaling rear control of error voltage is adjusted SG1525 by sampling feedback computing circuit 2
The pulse width of controller.
Basic functional principle of the invention by studying Pwm controller, with the pulse width modulation control of maturation
Device SG1525 processed is core, appropriate peripheral circuit of arranging in pairs or groups, a kind of base is realized using operational amplifier and analog comparator etc.
In the pulse frequency modulation drive circuit design method of pulsewidth modulation.The circuit structure form is simple, and required component is few, reliability
It is high.
The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is Pwm controller SG1525 working timing figure.
Fig. 2 is a kind of schematic diagram of the pulse frequency modulation drive circuit design method based on pulsewidth modulation.
Fig. 3~4 are a kind of circuit diagram of the pulse frequency modulation drive circuit design method based on pulsewidth modulation.
Fig. 5 is a kind of working timing figure of the pulse frequency modulation drive circuit design method based on pulsewidth modulation.
Embodiment
1) feedback circuit 1 is built
Feedback circuit 1, which is built, according to Fig. 3 circuits mutually follows operational amplifier, with phase operational amplifier, same phase by same
Operational amplifier is followed to form.The feedback circuit is scaling by error voltage, and output connects the timing of SG1525 controllers
Resistance terminal.
2) feedback circuit 2 is built
Feedback circuit 2, which is built, according to Fig. 4 circuits mutually follows operational amplifier, rp-op amp, addition by same
Operational amplifier and inverting amplifier composition.Error voltage is amplified and is superimposed an adjustable direct current by the feedback circuit
Level (sets potentiometer R19 regulations DC level).Error voltage amplification output is connect into SG1525 controller error amplifiers
In-phase input end.
3) pulse frequency modulated control circuit is built
4) output of feedback circuit 1 in 1) is connect to timing resistor end i.e. 6 ends of SG1525 controllers, control according to Fig. 2
The clock frequency of device processed is proportional to error voltage；2) output of feedback circuit 2 in is connect into the amplification of 1525 controller errors
The in-phase input end of device is 2 ends；By the backward end of 1525 controller error amplifiers and output end short circuit, that is, hold 9 (COMP.) and
Hold 1 (INV.) short circuit.Out A, Out B can replace the pulse signal that output frequency changes with error voltage, pulse signal
Width adjusts setting by the potentiometer R22 in computing circuit 2.
Claims (2)
- A kind of 1. pulse frequency modulation drive circuit design method based on pulsewidth modulation, it is characterised in that：With pulse width modulation control Device SG1525 processed is core, realizes pulse frequency modulation drive circuit using two feedback circuits as supporting peripheral circuit.
- 2. a kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation according to claim 1, its feature exist In：The output voltage of feedback operational amplifier 1 relation proportional to error voltage, export to the timing resistor end of PWM controller, Realize the regulation of SG1525 frequencies of oscillation；The output voltage of feedback operational amplifier 2 relation proportional to error voltage is separately superimposed One adjustable DC level, exports the tune for the in-phase end of PWM controller internal error amplifier, realizing pulse width Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710621823.XA CN107508452A (en) | 2017-07-27 | 2017-07-27 | A kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710621823.XA CN107508452A (en) | 2017-07-27 | 2017-07-27 | A kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107508452A true CN107508452A (en) | 2017-12-22 |
Family
ID=60689905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710621823.XA Pending CN107508452A (en) | 2017-07-27 | 2017-07-27 | A kind of pulse frequency modulation drive circuit design method based on pulsewidth modulation |
Country Status (1)
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| CN (1) | CN107508452A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202316A (en) * | 2020-09-29 | 2021-01-08 | 中国船舶重工集团公司第七二四研究所 | Design method of fixed-width frequency modulation analog circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867296A (en) * | 2010-06-01 | 2010-10-20 | 国电南瑞科技股份有限公司 | Series-resonant direct-current/direct-current converter |
-
2017
- 2017-07-27 CN CN201710621823.XA patent/CN107508452A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867296A (en) * | 2010-06-01 | 2010-10-20 | 国电南瑞科技股份有限公司 | Series-resonant direct-current/direct-current converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202316A (en) * | 2020-09-29 | 2021-01-08 | 中国船舶重工集团公司第七二四研究所 | Design method of fixed-width frequency modulation analog circuit |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171222 |
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| WD01 | Invention patent application deemed withdrawn after publication |