CN111082659A - Novel closed loop regulating circuit who possesses frequency modulation function - Google Patents
Novel closed loop regulating circuit who possesses frequency modulation function Download PDFInfo
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- CN111082659A CN111082659A CN201911128230.5A CN201911128230A CN111082659A CN 111082659 A CN111082659 A CN 111082659A CN 201911128230 A CN201911128230 A CN 201911128230A CN 111082659 A CN111082659 A CN 111082659A
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- regulator
- frequency modulation
- voltage
- modulation function
- output voltage
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
Abstract
The invention discloses a novel closed-loop regulating circuit with a frequency modulation function in the technical field of power electronic switching power supplies, which comprises a PI regulator and a PWM controller, wherein one path of output comparison level of output voltage of the PI regulator is connected to the COMP input end of the PWM controller, and the other path of output comparison level of the output voltage of the PI regulator is connected to the R input end of a sawtooth wave generator in the PWM controllerTAnd the end controls the frequency and the duty ratio of the PWM according to the change of the output voltage of the PI regulator. The invention can realize the simultaneous adjustment of the duty ratio and the frequency of the PWM driving pulse without changing the structure of the traditional PI regulator and only adding a circuit capable of adjusting the frequency of the sawtooth wave on the output side of the traditional PI regulator, and can obtain a faster loop response speed under the condition of not influencing the normal work of the main circuit of the power supply.
Description
Technical Field
The invention relates to the field of power electronic switching power supplies, in particular to a novel closed-loop regulating circuit with a frequency modulation function.
Background
The closed-loop regulating circuit in the switching power supply can be generally divided into a voltage loop, a current loop or a double closed loop (voltage outer loop and current inner loop), the loops are generally controlled to output by regulating the duty ratio of a PWM driving waveform of a switching tube, and the closed-loop regulating circuit has the characteristic of simple closed-loop implementation.
In the application occasion of the high-voltage power supply, the phenomenon of 'striking sparks' is easy to occur, namely, the power supply can output large current instantly when in 'striking sparks', and if the loop response speed is low, the power supply is likely to be damaged. Thus, the traditional loop regulation duty cycle may not meet the requirement, and a loop regulation method which is faster in response speed and easier to implement is preferably sought.
Disclosure of Invention
The present invention is directed to a novel closed loop adjusting circuit with frequency modulation function, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a novel closed loop regulating circuit that possesses frequency modulation function, includes PI regulator and PWM controller, the output voltage of PI regulator is exported comparison level all the way and is connected to the COMP input of PWM controller, and another way is connected to the R of the inside sawtooth wave generator of PWM controllerTAnd the PI regulator controls the frequency and the duty ratio of the PWM according to the change of the output voltage.
As a development of the invention, in order to further control the constant current charging current of the sawtooth wave generator to change the frequency of the rising edge and the falling edge of the sawtooth wave, the output voltage U of the PI regulatoraConnected to the inverting input terminal of the inverter and outputting a voltage UbSaid voltage UbR connected to the sawtooth generator after connecting the resistor RTEnd, R of said sawtooth generatorTTerminal connection resistor RTAnd then grounded.
As a modified scheme of the invention, in order to further control the duty ratio of PWM, the output voltage of the PI regulator is connected with the inverting input end of an inverter and then is connected with the inverting input end of a first-order low-pass filter circuit from the output end of the inverter, and the non-inverting input end of the first-order low-pass filter circuit is input with a voltage UdAnd the output end outputs a comparison level Ucomp。
As a development of the invention, the voltage U is used to further control the PWM duty cycledIs a fixed level.
As an improvement scheme of the invention, in order to further shield the influence of high-frequency noise on a loop, a first-order low-pass RC filter circuit is connected between the inverting input end and the inverting output end of the first-order low-pass filter circuit.
Has the advantages that:
the invention does not change the structure of the traditional PI regulator, only adds a circuit capable of regulating the frequency of the sawtooth wave on the output side of the traditional PI regulator, can realize the simultaneous regulation of the duty ratio and the frequency of the PWM driving pulse, and can obtain faster loop response speed under the condition of not influencing the normal work of the main circuit of the power supply.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a diagram of the circuit connection architecture of the present invention;
FIG. 3 is a circuit diagram of the output side of the PI regulator of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be further noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, which are merely for convenience of description and simplification of description, but do not indicate or imply that the referred devices or elements must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The output voltage of the switching power supply closed-loop PI regulator regulates the constant-current charging current of a sawtooth generator in a PWM control chip (such as SG3525), so that the slope of the rising edge and the falling edge of a sawtooth wave is changed, and the cycle of the sawtooth wave is changed accordingly. Generally, the PWM driving pulse output by the PWM control chip is half of the sawtooth wave frequency, and the sawtooth wave frequency changes, and the PWM driving pulse also changes, so as to adjust the pulse frequency of the output PWM.
The level of the PI regulator is a comparison level, and after the level is intersected with the sawtooth wave, the PI regulator compares and outputs a pulse signal of PWM, so that the duty ratio of the PWM is regulated. Therefore, the invention can simultaneously adjust the frequency and the duty ratio of the PWM pulse and improve the loop response speed.
Further, referring to fig. 2, the output voltage U of the PI regulatoraConnected to the inverting input terminal of the inverter and outputting a voltage UbVoltage UbR connected to sawtooth generator after connecting resistor RTR of end, sawtooth wave generatorTTerminal connection resistor RTAnd then grounded.
In FIG. 2, UaFor the output voltage value (generally negative polarity) of the PI regulator, U is invertedb＝-Ua. Time sequence capacitor CTThe charging current calculation formula is as follows:
in the above formula, pin 6 level U in SG3525 chipcConstant at 3.9V. Then, as can be seen from the above equation, the output voltage amplitude U of the PI regulator in the circuitbThe higher, the higher ICTThe smaller, CTThe longer the charging time, the smaller the sawtooth frequency.
Further, referring to fig. 2, after the output voltage of the PI regulator is connected to the inverting input terminal of the inverter, the output terminal of the inverter is connected to the inverting input terminal of a first-order low-pass filter circuit, and the non-inverting input terminal of the first-order low-pass filter circuit inputs the voltage UdAnd the output end outputs a comparison level Ucomp. The voltage Ud is a fixed level. And a first-order low-pass RC filter circuit is connected between the inverting input end and the inverting output end of the first-order low-pass filter circuit.
In FIG. 2, UdIs a fixed value, UcompIs the comparison level. Comparing level UcompThe calculation formula of (2) is as follows:
Ucomp＝(kp+1)Ud-kpUb
wherein k ispIs the amplification factor of the low-pass filter. From the above formula, the output voltage amplitude U of the PI regulator can be seenbThe higher the comparison level U finally output by the closed-loop regulating circuitcompThe smaller the PWM duty cycle is. And vice versa.
As shown in FIG. 3, VerrorIs the output end of a voltage PI regulator IerrorFor the current PI regulator output, U9_6 is U in fig. 2cAnd simultaneously, the 6 th pin of SG 3525. U9_9 is U in FIG. 2compAnd at the same time, the 9 th leg of SG 3525. U8_10 is the fixed level U in FIG. 2d。
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. The utility model provides a novel closed loop regulating circuit that possesses frequency modulation function, includes PI regulator and PWM controller, the output voltage of PI regulator is exported comparison level all the way and is connected to the COMP input of PWM controller, and another way is connected to the R of the inside sawtooth wave generator of PWM controllerTAnd the PI regulator controls the frequency and the duty ratio of the PWM according to the change of the output voltage.
2. The novel closed-loop regulating circuit with frequency modulation function as claimed in claim 1, wherein the output voltage U of the PI regulatoraConnected to the inverting input terminal of the inverter and outputting a voltage UbSaid voltage UbR connected to the sawtooth generator after connecting the resistor RTEnd, R of said sawtooth generatorTTerminal connection resistor RTAnd then grounded.
3. A novel closed-loop regulation circuit with frequency modulation function as claimed in claim 2, wherein the output voltage of the PI regulator is connected to the inverting input terminal of the inverter and then connected from the output terminal of the inverter to the inverting input terminal of a first-order low-pass filter circuit, the non-inverting input terminal of the first-order low-pass filter circuit is inputted with the voltage Ud and the output terminal of the first-order low-pass filter circuit outputs the comparison level Udcomp。
4. The novel closed-loop regulation circuit with frequency modulation function of claim 3, wherein the voltage U isdIs a fixed level.
5. The novel closed-loop regulating circuit with frequency modulation function as claimed in claim 4, wherein a first-order low-pass RC filter circuit is connected between the inverting input terminal and the inverting output terminal of the first-order low-pass filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911128230.5A CN111082659A (en) | 2019-11-18 | 2019-11-18 | Novel closed loop regulating circuit who possesses frequency modulation function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911128230.5A CN111082659A (en) | 2019-11-18 | 2019-11-18 | Novel closed loop regulating circuit who possesses frequency modulation function |
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Citations (7)
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| CN1595780A (en) * | 2003-09-08 | 2005-03-16 | 艾默生网络能源有限公司 | Control method and apparatus for series resonance DC/DC converter |
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| CN102307044A (en) * | 2011-09-14 | 2012-01-04 | 深圳航天科技创新研究院 | Switching power supply PWM (pulse width modulation) controller with variable frequencies |
| CN102710111A (en) * | 2012-06-06 | 2012-10-03 | 欧瑞传动电气有限公司 | Frequency converter and brake control method of constant voltage energy consumption thereof |
| CN103973105A (en) * | 2013-12-10 | 2014-08-06 | 国家电网公司 | Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters |
| US20150349639A1 (en) * | 2014-06-02 | 2015-12-03 | Fujitsu Limited | Power supply device and information processing apparatus |
| CN208969952U (en) * | 2018-07-09 | 2019-06-11 | 广西南宁市晨启科技有限责任公司 | A kind of acquisition of data and control integration experiment module |
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2019
- 2019-11-18 CN CN201911128230.5A patent/CN111082659A/en active Pending
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| CN1595780A (en) * | 2003-09-08 | 2005-03-16 | 艾默生网络能源有限公司 | Control method and apparatus for series resonance DC/DC converter |
| CN1794579A (en) * | 2006-01-12 | 2006-06-28 | 上海交通大学 | Switching frequency period modulated sawteeth wave generating circuit |
| CN102307044A (en) * | 2011-09-14 | 2012-01-04 | 深圳航天科技创新研究院 | Switching power supply PWM (pulse width modulation) controller with variable frequencies |
| CN102710111A (en) * | 2012-06-06 | 2012-10-03 | 欧瑞传动电气有限公司 | Frequency converter and brake control method of constant voltage energy consumption thereof |
| CN103973105A (en) * | 2013-12-10 | 2014-08-06 | 国家电网公司 | Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters |
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