CN101068094A - Switch power source output voltage regulating method and realizing circuit - Google Patents
Switch power source output voltage regulating method and realizing circuit Download PDFInfo
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- CN101068094A CN101068094A CN 200710074658 CN200710074658A CN101068094A CN 101068094 A CN101068094 A CN 101068094A CN 200710074658 CN200710074658 CN 200710074658 CN 200710074658 A CN200710074658 A CN 200710074658A CN 101068094 A CN101068094 A CN 101068094A
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Abstract
A method for regulating output voltage of switch power supply includes setting output voltage of D/A on D/A conversion module by varying electric level of I/O pin on monolithic computer, making output voltage of switch power supply be decreased by filling current to feedback sampling point with D/A through regulation resistance when output voltage of D/A is greater than voltage of feedback sampling point or otherwise making output voltage of switch power supply be increased. The circuit used for realizing said method is also disclosed.
Description
[technical field]
The present invention relates to the switch power technology field, relate in particular to a kind of control method of switch power source output voltage and realize circuit.
[background technology]
The regulative mode of industry switch power source output voltage has two kinds at present:
1. adjustable potentiometer pressure regulation.Slide plate position by regulating adjustable potentiometer VR1 as shown in Figure 1 and the resistance of fit adjustment feedback sample resistance R 4 and R5 realize the adjusting to output voltage, wherein feedback sample resistance R 4, R5 and adjustable potentiometer VR1 form output voltage sampling circuit, operational amplifier A mp1 conduct and benchmark amplifying circuit relatively, it can be made of the adjustable shunting a reference source of three ends TL431, also can constitute with integrated transporting discharging.By regulating the slide plate position of adjustable potentiometer VR1, the feedback sample resistance R 4 at two ends and R5 resistance realize the adjusting to output voltage about the distribution sample circuit.
Though this method is easy to adjust; But, be easy to generate the drift of resistance value because adjustable potentiometer is subject to factor affecting such as temperature, temperature, salinity, dirt, air pollution, elevation.In addition, making house calls and adjusting adjustable potentiometer is very common after-sale service project, but such after-sales service cost is very high.
2. digital voltage regulation.As shown in Figure 2, by being that contact between feedback sample resistance R 4 and the R5 is irritated electric current or absorbing current is regulated output voltage to the feedback sample point, wherein digital/analog converter D/A can be under the jurisdiction of MCU and also can independently exist.The user sets the output voltage of D/A by I2C mouth or serial port (I2C or SerialBus); D/A is by regulating resistance R 3 changes Switching Power Supply to feedback sample point filling electric current or absorbing current output voltage.The size of the switch power source output voltage regulating power scope by the output voltage of size of regulating resistance R 3 and D/A is decided.
Though this method is stable to the adjusting of voltage, is not subjected to Effect of Environmental such as temperature and humidity; But regulate very inconvenient, no matter be computer or special instrument must be arranged all in production or maintenance process, could utilize computer or special instrument the output voltage of voltage to be regulated like this, and need special software by I2C mouth or serial port; This just makes Switching Power Supply increase in the difficulty of producing and safeguarding, has increased cost.
[summary of the invention]
The invention provides a kind of control method that can conveniently regulate and not be subjected to the switch power source output voltage of such environmental effects.
Further, the present invention also provides a kind of realization circuit of control method of the switch power source output voltage that can conveniently regulate and not be subjected to such environmental effects.
In order to solve above technical problem, the invention provides a kind of control method of switch power source output voltage: the level of the I/O pin by changing single-chip microprocessor MCU, set the output voltage of D/A switch module D/A, when the output voltage of D/A greater than feedback sample point promptly during the voltage of the tie point of the first feedback sample resistance R 4 and the second feedback sample resistance R 5, D/A irritates electric current by regulating resistance R 3 to feedback sample point, and the output voltage of Switching Power Supply reduces; If instead the output voltage of D/A is during less than the voltage of feedback sample point, then D/A is by regulating resistance R 3 from the sampled point absorbing current, and the output voltage of Switching Power Supply increases.
Further, in order to solve above technical problem, the present invention also provides a kind of realization circuit of control method of switch power source output voltage, comprise relatively amplifying circuit Amp1 of single-chip microprocessor MCU, D/A switch module D/A, output voltage sampling circuit and benchmark, also comprise the first short circuit device JP1 and first resistance R 1; End ground connection or the dc power supply VCC of the described first short circuit device JP1, the I/O pin Pin1 of another termination MCU; One termination dc power supply VCC or ground connection of described first resistance R 1, the contact of another termination MCU and the first short circuit device JP1; Described MCU, D/A, output voltage sampling circuit and benchmark relatively input, the output pin/end of amplifying circuit Amp1 are connected in turn.
The realization circuit of the control method of above-described switch power source output voltage also comprises second resistance R 2 and the second short circuit device JP2, end ground connection or the dc power supply VCC of the described second short circuit device JP2, the 2nd I/O pin Pin2 of another termination MCU; One termination dc power supply VCC or ground connection of described second resistance R 2, the contact of another termination MCU and the second short circuit device JP2.
The realization circuit of the control method of above-described switch power source output voltage, described output voltage sampling circuit comprises regulates resistance R 3, the first feedback sample resistance R 4 and the second feedback sample resistance R 5, and wherein the first feedback sample resistance R 4 and the second feedback sample resistance R 5 are connected between Switching Power Supply output Output and the ground; Regulate the output of a termination D/A of resistance R 3, another termination feedback sample point.
The realization circuit of the control method of above-described switch power source output voltage, described benchmark comparison amplifying circuit Amp1 is made of three ends adjustable shunting a reference source TL431 or integrated transporting discharging, wherein the first input end of benchmark comparison amplifying circuit connects the feedback sample point, the second input termination reference voltage Vref, output is feedback end K.
The realization circuit of the control method of above-described switch power source output voltage, described D/A are under the jurisdiction of MCU or independent the existence.
The realization circuit of the control method of above-described switch power source output voltage, described benchmark comparison amplifying circuit Amp1 is made of integrated transporting discharging, wherein the first input end of benchmark comparison amplifying circuit Amp1 is the inverting input of integrated transporting discharging, and second input is the in-phase input end of integrated transporting discharging.
The control method of switch power source output voltage of the present invention and realization circuit are not increasing under the condition of cost, further excavate the potentiality of MCU, problems of the prior art have been solved:, the invention solves the problem that switch power source output voltage is subjected to the external environment variable effect with respect to the adjustable potentiometer voltage regulating mode; With respect to the digital voltage regulation mode, the present invention has simplified the control method of switch power source output voltage greatly.
[description of drawings]
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit theory diagrams of prior art 1.
Fig. 2 is the circuit theory diagrams of prior art 2.
Fig. 3 is the control method of switch power source output voltage of the present invention and the circuit theory diagrams of realizing circuit embodiments 1.
Fig. 4 is the control method of switch power source output voltage of the present invention and the circuit theory diagrams of realizing circuit embodiments 2.
Fig. 5 is the control method of switch power source output voltage of the present invention and the circuit theory diagrams of realizing circuit embodiments 3.
Fig. 6 is the control method of switch power source output voltage of the present invention and the circuit theory diagrams of realizing circuit embodiments 4.
[embodiment]
In the control method and realization circuit embodiments 1 of switch power source output voltage of the present invention shown in Figure 3, comprise first resistance R 1, second resistance R 2, the first short circuit device JP1, the second short circuit device JP2, single-chip microprocessor MCU, D/A switch module D/A, regulate relatively amplifying circuit Amp1 of resistance R 3, the first feedback sample resistance R 4, the second feedback sample resistance R 5 and benchmark, wherein benchmark comparison amplifying circuit Amp1 is made of three ends adjustable shunting a reference source TL431 or integrated transporting discharging, is made of integrated transporting discharging in the present embodiment.
In the present embodiment, when regulation voltage not, the first short circuit device JP1 and the second short circuit device JP2 all disconnect, and first resistance R 1 and second resistance R 2 are drawn high the I/O pin Pin1 of MCU and the current potential of the 2nd I/O pin Pin2 respectively.During the short circuit first short circuit device JP1, the current potential of pin Pin1 is dragged down, and the output voltage of MCU control D/A progressively increases; During the short circuit second short circuit device JP2, the current potential of pin Pin2 is dragged down, and the output voltage of MCU control D/A progressively reduces.Set the output voltage of D/A by MCU.When the output voltage of D/A during greater than the sampled voltage of feedback sample point, D/A irritates electric current by regulating resistance R 3 to feedback point, and at this moment the output voltage of Switching Power Supply can reduce; If instead the output voltage of D/A is during less than the sampled voltage of feedback sample point, then by regulating resistance R 3 from feedback sample point absorbing current, at this moment the output voltage of Switching Power Supply can increase D/A.As seen, the size of the excursion of adjusting D/A output voltage and adjusting resistance R 3 just can change the regulating power to switch power source output voltage.
In addition, in the practical circuit of present embodiment, can increase the performance that current-limiting resistance and filter capacitor further improve circuit working in the input of the I/O of MCU pin.
At the control method of switch power source output voltage of the present invention shown in Figure 4 and realize in the circuit embodiments 2, different with the foregoing description 1 is that the short circuit device meets dc power supply VCC.
In the present embodiment, when regulation voltage not, the first short circuit device JP1 and the second short circuit device JP2 all disconnect, and first resistance R 1 and second resistance R 2 drag down the I/O pin Pin1 of MCU and the current potential of the 2nd I/O pin Pin2 respectively.During the short circuit first short circuit device JP1, the pin Pin1 of MCU is changed to high potential, and MCU control D/A progressively increases its output voltage; During the short circuit second short circuit device JP2, the pin Pin2 of MCU is changed to high level, and MCU control D/A progressively reduces its output voltage.
In the control method and realization circuit embodiments 3 of switch power source output voltage of the present invention shown in Figure 5, different with the foregoing description 1 and embodiment 2 is, comprise first short circuit device ' 1 and first resistance R 1, the first short circuit device JP1 and first resistance R 1 are connected between dc power supply VCC and the ground, the series connection contact of the first short circuit device JP1 and first resistance R 1 is connected to I/O pin Pin1, wherein a short circuit device ground connection of single-chip microprocessor MCU.
In the present embodiment, use an I/O pin regulation voltage of single-chip microprocessor MCU, when regulation voltage not, the first short circuit device JP1 disconnects, and first resistance R 1 is drawn the pin Pin1 of MCU and is high potential.When the short circuit first short circuit device JP1, the output voltage of D/A increases gradually, and after reaching maximum, if the first short circuit device short circuit still, the output voltage of D/A jumps to minimum value, increases gradually again; The output voltage of D/A reduces gradually in the time of can also being arranged so that the short circuit first short circuit device JP1 in addition, and after reaching minimum value, if first short circuit device JP1 short circuit still, then the output voltage of D/A jumps to maximum, reduces gradually again.
At the control method of switch power source output voltage of the present invention shown in Figure 6 and realize in the circuit embodiments 4, different with the foregoing description 3 is that the short circuit device meets dc power supply VCC.
In the present embodiment, when regulation voltage not, the first short circuit device JP1 disconnects, and first resistance R 1 is drawn the pin Pin1 of MCU and is electronegative potential.When the short circuit first short circuit device JP1, the output voltage of D/A increases gradually, and after reaching maximum, if JP1 short circuit still, then the output voltage of D/A jumps to minimum value, increases gradually again; In the time of can also being arranged so that the short circuit first short circuit device JP1 in addition, the output voltage of D/A reduces gradually, and after reaching minimum value, if JP1 short circuit still, then the output voltage of D/A jumps to maximum, reduces gradually again.
More than to the control method of a kind of switch power source output voltage provided by the present invention and realize that circuit is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. the control method of a switch power source output voltage, it is characterized in that, the level of the I/O pin by changing single-chip microprocessor MCU, set the output voltage of D/A switch module D/A, when the output voltage of D/A greater than feedback sample point promptly during the voltage of the tie point of the first feedback sample resistance (R4) and the second feedback sample resistance (R5), D/A irritates electric current by regulating resistance (R3) to feedback sample point, and the output voltage of Switching Power Supply reduces; If instead the output voltage of D/A is during less than the voltage of feedback sample point, then D/A is by regulating resistance (R3) from the sampled point absorbing current, and the output voltage of Switching Power Supply increases.
2. the realization circuit of the control method of a switch power source output voltage according to claim 1, comprise relatively amplifying circuit (Amp1) of single-chip microprocessor MCU, D/A switch module D/A, output voltage sampling circuit and benchmark, it is characterized in that, also comprise the first short circuit device (JP1) and first resistance (R1); One end ground connection of the described first short circuit device (JP1) or dc power supply (VCC), the I/O pin (Pin1) of another termination MCU; One termination dc power supply (VCC) or ground connection of described first resistance (R1), the contact of another termination MCU and the first short circuit device (JP1); Described MCU, D/A, output voltage sampling circuit and benchmark relatively input, the output pin/end of amplifying circuit (Amp1) are connected in turn.
3. the realization circuit of the control method of switch power source output voltage according to claim 2, it is characterized in that, also comprise second resistance (R2) and the second short circuit device (JP2), one end ground connection of the described second short circuit device (JP2) or dc power supply (VCC), the 2nd I/O pin (Pin2) of another termination MCU; One termination dc power supply (VCC) or ground connection of described second resistance (R2), the contact of another termination MCU and the second short circuit device (JP2).
4. according to the realization circuit of the control method of claim 2 or 3 described switch power source output voltages, it is characterized in that, described output voltage sampling circuit comprises regulates resistance (R3), the first feedback sample resistance (R4) and the second feedback sample resistance (R5), and wherein the first feedback sample resistance (R4) and the second feedback sample resistance (R5) are connected between Switching Power Supply output (Output) and the ground; Regulate the output of a termination D/A of resistance (R3), another termination feedback sample point.
5. according to the realization circuit of the control method of claim 2 or 3 described switch power source output voltages, it is characterized in that, described benchmark relatively amplifying circuit (Amp1) is made of adjustable shunting a reference sources of three ends (TL431) or integrated transporting discharging, wherein the first input end of benchmark comparison amplifying circuit connects the feedback sample point, the second input termination reference voltage (V
Ref), output is feedback end (K).
6. according to the realization circuit of the control method of claim 2 or 3 described switch power source output voltages, it is characterized in that described D/A is under the jurisdiction of MCU or independent the existence.
7. according to the realization circuit of the control method of right 5 described switch power source output voltages, it is characterized in that, described benchmark relatively amplifying circuit (Amp1) is made of integrated transporting discharging, wherein the first input end of benchmark comparison amplifying circuit (Amp1) is the inverting input of integrated transporting discharging, and second input is the in-phase input end of integrated transporting discharging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100746587A CN101068094B (en) | 2007-05-30 | 2007-05-30 | Switch power source output voltage regulating method and realizing circuit |
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| CN2007100746587A CN101068094B (en) | 2007-05-30 | 2007-05-30 | Switch power source output voltage regulating method and realizing circuit |
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| CN101068094B CN101068094B (en) | 2010-10-06 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520220A (en) * | 2012-01-13 | 2012-06-27 | 苏州工业园区河洛科技有限公司 | Power supply circuit |
| CN102736653A (en) * | 2012-06-28 | 2012-10-17 | 何泽骅 | Voltage-stabilized power supply of numerical controlled switch |
| CN102938612A (en) * | 2012-11-26 | 2013-02-20 | 长沙学院 | Digital control method of DC (direct current) converter meeting wide input-output voltage requirements |
| CN103840662A (en) * | 2012-11-23 | 2014-06-04 | 联创汽车电子有限公司 | DC voltage-boosting chopper circuit |
| CN106524842A (en) * | 2016-11-30 | 2017-03-22 | 中国电子科技集团公司第三十八研究所 | Digital self-adaptive direct-current voltage regulating device applied to electronic detonator explosion initiating device |
| CN109471483A (en) * | 2018-11-01 | 2019-03-15 | 青岛海信宽带多媒体技术有限公司 | Voltage control circuit and optical module |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111277134A (en) * | 2020-01-21 | 2020-06-12 | 京东方科技集团股份有限公司 | Voltage conversion circuit and display device |
| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
| CN113485507A (en) * | 2021-07-07 | 2021-10-08 | 深圳东昇射频技术有限公司 | High-precision anti-noise multiplication control voltage-to-current method |
-
2007
- 2007-05-30 CN CN2007100746587A patent/CN101068094B/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520220A (en) * | 2012-01-13 | 2012-06-27 | 苏州工业园区河洛科技有限公司 | Power supply circuit |
| CN102736653A (en) * | 2012-06-28 | 2012-10-17 | 何泽骅 | Voltage-stabilized power supply of numerical controlled switch |
| CN103840662A (en) * | 2012-11-23 | 2014-06-04 | 联创汽车电子有限公司 | DC voltage-boosting chopper circuit |
| CN103840662B (en) * | 2012-11-23 | 2017-11-14 | 联创汽车电子有限公司 | DC boosting chopper circuit |
| CN102938612A (en) * | 2012-11-26 | 2013-02-20 | 长沙学院 | Digital control method of DC (direct current) converter meeting wide input-output voltage requirements |
| CN106524842A (en) * | 2016-11-30 | 2017-03-22 | 中国电子科技集团公司第三十八研究所 | Digital self-adaptive direct-current voltage regulating device applied to electronic detonator explosion initiating device |
| CN109471483A (en) * | 2018-11-01 | 2019-03-15 | 青岛海信宽带多媒体技术有限公司 | Voltage control circuit and optical module |
| CN109471483B (en) * | 2018-11-01 | 2020-08-04 | 青岛海信宽带多媒体技术有限公司 | Voltage control circuit and optical module |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111277134A (en) * | 2020-01-21 | 2020-06-12 | 京东方科技集团股份有限公司 | Voltage conversion circuit and display device |
| CN113485507A (en) * | 2021-07-07 | 2021-10-08 | 深圳东昇射频技术有限公司 | High-precision anti-noise multiplication control voltage-to-current method |
| CN113224948A (en) * | 2021-07-08 | 2021-08-06 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
| CN113224948B (en) * | 2021-07-08 | 2021-09-24 | 上海芯龙半导体技术股份有限公司 | Switching power supply circuit, switching power supply chip and switching power supply system |
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