CN213305261U - Program-controlled voltage circuit based on digital-to-analog conversion chip - Google Patents
Program-controlled voltage circuit based on digital-to-analog conversion chip Download PDFInfo
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- CN213305261U CN213305261U CN202022733251.4U CN202022733251U CN213305261U CN 213305261 U CN213305261 U CN 213305261U CN 202022733251 U CN202022733251 U CN 202022733251U CN 213305261 U CN213305261 U CN 213305261U
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Abstract
The utility model discloses a programme-controlled voltage circuit based on digital analog conversion chip, this programme-controlled voltage circuit includes: the device comprises a switching power supply chip and a digital-to-analog conversion chip; the voltage output end of the digital-to-analog conversion chip is electrically connected with the feedback pin of the switching power supply chip through a plurality of resistors, and the digital-to-analog conversion chip is used for adjusting the feedback voltage of the feedback pin of the switching power supply chip through the output voltage of the digital-to-analog conversion chip, so that the output voltage of the voltage output end of the switching power supply chip is adjusted. The utility model discloses realize the regulation of miniwatt switch supply voltage under the condition that does not produce phase deviation, hardware circuit is simple, and is with low costs, easy to operate, easily extensive realization.
Description
Technical Field
The utility model belongs to the technical field of programme-controlled voltage, concretely relates to programme-controlled voltage circuit based on digital analog conversion chip.
Background
The low-power program-controlled voltage regulation is mainly formed by combining the traditional switching power supply technology and a control chip, and the program is transplanted into the control chip through a PC (personal computer) end so as to achieve the purpose of controlling the output of the switching power supply. Programmable voltage regulation techniques are needed where the output of the low power drive is variable. The main scheme of the technology is to adjust the existing switching power supply circuit. The main working principle of the switching power supply is that the duty ratio of the switching power supply is changed by comparing and amplifying the voltage of a feedback pin and an internal reference through an error amplifier to realize voltage regulation, and the output voltage is determined by utilizing the principle. Thus, the power output regulation can be realized only by changing the feedback loop.
So far, there are many main adjusting methods, specifically, the following two schemes:
one scheme is that the feedback voltage and DAC are subjected to inverse subtraction amplification and output to a chip feedback pin, so that the output voltage is changed, and the phase deviation of the generated output voltage is easy to generate
The other scheme is that the resistance value of a feedback network resistor is directly changed, so that the feedback quantity is changed to adjust the output voltage, a digital potentiometer is needed to adjust the output voltage, and the resistance value is changed by controlling the digital potentiometer, so that the feedback network is directly changed to adjust the output voltage. The digital potentiometer is a scheme for realizing numerical control by changing the resistance value of an output resistor through controlling the internal switch condition by a program. The output voltage of the conventional switching power supply is determined by the voltage of the feedback pin and the internal reference, and the voltage and the internal reference are subjected to error amplification through an error amplifier. Therefore, the output voltage can be changed by only changing the resistance value of the feedback end resistor. The digital potentiometer is controlled by a program to adjust the resistance of the feedback pin, so that the output of the switching power supply is controlled. The scheme of directly changing the resistance value of the feedback network resistor through a digital potentiometer to regulate the output voltage is limited by hardware technology. The adjustment range of the digital potentiometer depends on the number of gears of the digital potentiometer, and the higher the number of gears is, the higher the corresponding cost is. And common digital potentiometers are direct-control devices, and cannot reflect the positions of internal gears in real time, and if the gears are not changed due to faults in the adjusting process, the terminals do not accord with the actual results, so that errors occur.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a programme-controlled voltage circuit based on digital analog conversion chip.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a program-controlled voltage circuit based on a digital-to-analog conversion chip comprises: the device comprises a switching power supply chip and a digital-to-analog conversion chip; the voltage output end of the digital-to-analog conversion chip is electrically connected with the feedback pin of the switching power supply chip through a plurality of resistors, and the digital-to-analog conversion chip is used for adjusting the feedback voltage of the feedback pin of the switching power supply chip through the output voltage of the digital-to-analog conversion chip, so that the output voltage of the voltage output end of the switching power supply chip is adjusted.
On the basis of the technical scheme, the following improvements can be made:
preferably, the voltage output end of the digital-to-analog conversion chip is grounded through a resistor R17 and a capacitor C48 in sequence, and is electrically connected with the feedback pin of the switching power supply chip through a resistor R17 and a resistor R77 in sequence.
Preferably, the resistor R17 has a resistance of 1K Ω, the resistor R77 has a resistance of 10K Ω, and the capacitor C48 has a capacitance of 100 pF.
Preferably, the switching power supply chip is an MP1482 chip.
As a preferred scheme, a pin IN of an MP1482 chip is connected with a working power supply;
a pin EN of the MP1482 chip is connected with a working power supply through a resistor R1;
pin SS of MP1482 chip is grounded through capacitor C6;
a pin GND of the MP1482 chip is grounded;
a pin COMP of the MP1482 chip is grounded through a capacitor C7 and a resistor R4 in sequence;
a pin FB of the MP1482 chip is grounded through a resistor R3, is electrically connected with a voltage output end of the MP1482 chip sequentially through a resistor R5 and a resistor R2, is grounded through a resistor R5, a resistor R2 and a capacitor C3 sequentially, and is electrically connected with a voltage output end of the digital-to-analog conversion chip through a plurality of resistors;
the pin SW of the MP1482 chip is electrically connected with the pin BS of the MP1482 chip through the capacitor C2, is electrically connected with the voltage output end of the MP1482 chip through the inductor L1, is grounded through the inductor L1 and the capacitor C4 in sequence, and is grounded through the inductor L1 and the capacitor C5 in sequence.
Preferably, the resistance value of the resistor R1 is 100K Ω, the resistance value of the resistor R2 is 30K Ω, the resistance value of the resistor R3 is 3K Ω, the resistance value of the resistor R4 is 2.2K Ω, and the resistance value of the resistor R5 is 27K Ω;
the capacitance of the capacitor C2 is 10nf, the capacitance of the capacitor C3 is 22 μ f, the capacitance of the capacitor C4 is 0.1 μ f, the capacitance of the capacitor C5 is 0.1 μ f, the capacitance of the capacitor C6 is 0.1 μ f, and the capacitance of the capacitor C7 is 3.3 nf.
Preferably, the pin IN of the MP1482 chip is grounded via a capacitor C1.
Preferably, the capacitance value of the capacitor C1 is 22 μ f.
Preferably, the digital-to-analog conversion chip is a DAC7512 chip.
The utility model discloses a programme-controlled voltage circuit based on digital analog conversion chip, switching power supply chip voltage output's output voltage Vcc is carried out the comparison amplification mode by feedback pin voltage Vfb and inside benchmark through error amplifier and is realized, and the feedback voltage Vfb of feedback pin obtains through digital analog conversion chip voltage output's output voltage Vout. The utility model discloses realize the regulation of miniwatt switch supply voltage under the condition that does not produce phase deviation, hardware circuit is simple, and is with low costs, easy to operate, easily extensive realization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit block diagram of the program-controlled voltage circuit based on the digital-to-analog conversion chip provided by the embodiment of the present invention.
Fig. 2 is a circuit diagram of a switching power supply chip according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a digital-to-analog conversion chip according to an embodiment of the present invention.
Fig. 4 is a block diagram of an internal structure of a digital-to-analog conversion chip according to an embodiment of the present invention.
Wherein: 1-switching power supply chip, 2-digital-to-analog conversion chip.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The expression "comprising" an element is an "open" expression which merely means that there are corresponding parts, which should not be interpreted as excluding additional parts.
In order to achieve the object of the present invention, in some embodiments of a programmable voltage circuit based on a digital-to-analog conversion chip, as shown in fig. 1, the programmable voltage circuit includes: a switching power supply chip 1 and a digital-to-analog conversion chip 2; the voltage output end of the digital-to-analog conversion chip 2 is electrically connected with the feedback pin of the switching power supply chip 1 through a plurality of resistors, and the digital-to-analog conversion chip 2 is used for adjusting the feedback voltage of the feedback pin of the switching power supply chip 1 through the output voltage of the digital-to-analog conversion chip, so that the output voltage of the voltage output end of the switching power supply chip 1 is adjusted.
In order to further optimize the implementation effect of the present invention, in other embodiments, the rest of the feature technologies are the same, except that the voltage output end of the digital-to-analog conversion chip 2 sequentially passes through the resistor R17 and the capacitor C48 to be grounded, and further sequentially passes through the resistor R17 and the resistor R77 to be electrically connected to the feedback pin of the switching power supply chip 1.
Further, the resistance value of the resistor R17 is 1K Ω, the resistance value of the resistor R77 is 10K Ω, and the capacitance value of the capacitor C48 is 100 pF.
The switching power supply chip can be but is not limited to an MP1482 chip, and the digital-to-analog conversion chip can be but is not limited to a DAC7512 chip.
For better understanding of the present invention, the MP1482 chip and the DAC7512 chip are used as examples for description.
As shown IN fig. 2, pin IN of MP1482 chip is connected to the working power supply;
a pin EN of the MP1482 chip is connected with a working power supply through a resistor R1;
pin SS of MP1482 chip is grounded through capacitor C6;
a pin GND of the MP1482 chip is grounded;
a pin COMP of the MP1482 chip is grounded through a capacitor C7 and a resistor R4 in sequence;
a pin FB of the MP1482 chip is grounded through a resistor R3, is electrically connected with a voltage output end Vcc of the MP1482 chip sequentially through a resistor R5 and a resistor R2, is grounded sequentially through a resistor R5, a resistor R2 and a capacitor C3, and is electrically connected with a voltage output end of the digital-to-analog conversion chip through a plurality of resistors;
the pin SW of the MP1482 chip is electrically connected to the pin BS of the MP1482 chip through the capacitor C2, and is electrically connected to the voltage output terminal Vcc of the MP1482 chip through the inductor L1, and is grounded through the inductor L1 and the capacitor C4 in sequence, and is grounded through the inductor L1 and the capacitor C5 in sequence.
The resistance value of the resistor R1 is 100K omega, the resistance value of the resistor R2 is 30K omega, the resistance value of the resistor R3 is 3K omega, the resistance value of the resistor R4 is 2.2K omega, and the resistance value of the resistor R5 is 27K omega;
the capacitance of the capacitor C2 is 10nf, the capacitance of the capacitor C3 is 22 μ f, the capacitance of the capacitor C4 is 0.1 μ f, the capacitance of the capacitor C5 is 0.1 μ f, the capacitance of the capacitor C6 is 0.1 μ f, and the capacitance of the capacitor C7 is 3.3 nf.
Further, pin IN of MP1482 chip is grounded via a capacitor C1, and the capacitance of the capacitor C1 is 22 μ f.
As shown in fig. 3, pin VDD of DAC7512 is connected to the working power supply and to ground via capacitor C8, and the capacitance of capacitor C8 is 0.1 μ ff;
a pin GND of the DAC7512 chip is grounded;
the pin VOUT of the DAC7512 chip is grounded through a resistor R17 and a capacitor C48 in sequence, and is also electrically connected with the pin FB of the switching power supply chip through a resistor R17 and a resistor R77 in sequence.
As shown in fig. 4, when the DAC7512 chip drives, it needs to write a value into the DAC, which ranges from 0 to 4095, and after passing through the register, the value is distributed to different paths, and the corresponding on-path resistance is divided to obtain the output voltage Vout. The input code of the DAC7512 chip is binary, and the ideal output voltage formula is:
Vout＝Vdd*(D/4096)
wherein: d is the decimal equivalent of the binary code loaded into the DAC register, which ranges from 0-4095, and Vdd is the input operating supply voltage.
In general, the feedback voltage Vfb on the feedback pin FB of the MP1482 chip is constant, and the output voltage Vcc of the MP1482 chip is obtained by comparing and amplifying the feedback voltage Vfb with an internal reference through an error amplifier. The utility model discloses a digital analog conversion chip changes feedback loop and realizes that power output adjusts. The output voltage Vout of the digital-to-analog conversion chip can be adjusted.
As shown in fig. 2 and 3, the voltage output terminal of the ADC7512 chip is electrically connected to the feedback pin FB of the MP1482 chip through a plurality of resistors, which can be obtained according to kirchhoff's current law:
(Vcc-Vfb)/(R5+R2)+(Vout-Vfb)/(R17+R77)＝Vfb/R3
according to the formula, the linear relation between Vcc and Vout can be obtained, and the output Vout is controlled and regulated by the DAC7512, so that the output voltage VCC of the switching power supply can be freely regulated.
The traditional output regulation scheme of the switching power supply mainly changes the resistance value of a feedback network resistor through a potentiometer so as to change output voltage, but in this way, a regulation interface is required to be reserved on appearance design, and manual regulation needs to be matched with display to observe the voltage required to be regulated in real time, so that the trouble and cost of design are increased, and manual operation causes a lot of variable factors, for example, the potentiometer is damaged due to too large force, the product is damaged due to too high voltage due to too fast regulation, and the like.
The advantage of programme-controlled regulation can come the different voltage of modulation according to actual need, can directly adjust the voltage that wants the output through the terminal, only needs to input corresponding numerical value to DAC in advance, and after String register, the numerical value is distributed to different routes, and the corresponding resistance that opens the route divides voltage, reachs output voltage, has brought very big convenience for reality. The DAC is used for output program control adjustment, so that the circuit is simple, the cost is low, the operation is easy, the external interference is small, and the product performance is stable.
The utility model relates to a programme-controlled voltage circuit based on digital analog conversion chip realizes the regulation of miniwatt switch supply voltage under the condition that does not produce phase deviation, and hardware circuit is simple, and is with low costs, easy to operate, easily extensive realization.
The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (9)
1. A program-controlled voltage circuit based on a digital-to-analog conversion chip is characterized by comprising: the device comprises a switching power supply chip and a digital-to-analog conversion chip; the voltage output end of the digital-to-analog conversion chip is electrically connected with the feedback pin of the switching power supply chip through a plurality of resistors, and the digital-to-analog conversion chip is used for adjusting the feedback voltage of the feedback pin of the switching power supply chip through the output voltage of the digital-to-analog conversion chip, so that the output voltage of the voltage output end of the switching power supply chip is adjusted.
2. The programmable voltage circuit of claim 1, wherein the voltage output terminal of the digital-to-analog conversion chip is connected to ground through a resistor R17 and a capacitor C48 in sequence, and is further electrically connected to the feedback pin of the switching power supply chip through a resistor R17 and a resistor R77 in sequence.
3. The programmable voltage circuit of claim 2, wherein the resistance of the resistor R17 is 1K Ω, the resistance of the resistor R77 is 10K Ω, and the capacitance of the capacitor C48 is 100 pF.
4. The programmable voltage circuit of claim 1, wherein the switching power supply chip is an MP1482 chip.
5. The programmable voltage circuit of claim 4,
a pin IN of the MP1482 chip is connected with a working power supply;
a pin EN of the MP1482 chip is connected with a working power supply through a resistor R1;
pin SS of MP1482 chip is grounded through capacitor C6;
a pin GND of the MP1482 chip is grounded;
a pin COMP of the MP1482 chip is grounded through a capacitor C7 and a resistor R4 in sequence;
a pin FB of the MP1482 chip is grounded through a resistor R3, is electrically connected with a voltage output end of the MP1482 chip sequentially through a resistor R5 and a resistor R2, is grounded through a resistor R5, a resistor R2 and a capacitor C3 sequentially, and is electrically connected with a voltage output end of the digital-to-analog conversion chip through a plurality of resistors;
the pin SW of the MP1482 chip is electrically connected with the pin BS of the MP1482 chip through the capacitor C2, is electrically connected with the voltage output end of the MP1482 chip through the inductor L1, is grounded through the inductor L1 and the capacitor C4 in sequence, and is grounded through the inductor L1 and the capacitor C5 in sequence.
6. The programmable voltage circuit of claim 5, wherein the resistor R1 has a resistance of 100 kQ, the resistor R2 has a resistance of 30 kQ, the resistor R3 has a resistance of 3 kQ, the resistor R4 has a resistance of 2.2 kQ, and the resistor R5 has a resistance of 27 kQ;
the capacitance value of the capacitor C2 is 10nf, the capacitance value of the capacitor C3 is 22 μ f, the capacitance value of the capacitor C4 is 0.1 μ f, the capacitance value of the capacitor C5 is 0.1 μ f, the capacitance value of the capacitor C6 is 0.1 μ f, and the capacitance value of the capacitor C7 is 3.3 nf.
7. The programmable voltage circuit of claim 5, wherein the pin IN of the MP1482 chip is connected to ground through a capacitor C1.
8. The programmable voltage circuit of claim 7, wherein the capacitance value of the capacitor C1 is 22 μ f.
9. The programmable voltage circuit of any of claims 1-8, wherein the digital-to-analog conversion chip is a DAC7512 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022733251.4U CN213305261U (en) | 2020-11-24 | 2020-11-24 | Program-controlled voltage circuit based on digital-to-analog conversion chip |
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| CN202022733251.4U CN213305261U (en) | 2020-11-24 | 2020-11-24 | Program-controlled voltage circuit based on digital-to-analog conversion chip |
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| CN213305261U true CN213305261U (en) | 2021-05-28 |
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Address after: No. 02, 5 / F, block 7, Fenghuang Industrial Park, No. 52, Liufang Avenue, fozuling street, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee after: Wuhan Xiantong Technology Co.,Ltd. Address before: No. 02, 5 / F, block 7, Fenghuang Industrial Park, No. 52, Liufang Avenue, fozuling street, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee before: WUHAN XIANTONG TECHNOLOGY Co.,Ltd. |
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