CN113271004A - Adjustable boost power supply of high accuracy software - Google Patents
Adjustable boost power supply of high accuracy software Download PDFInfo
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- CN113271004A CN113271004A CN202110558786.9A CN202110558786A CN113271004A CN 113271004 A CN113271004 A CN 113271004A CN 202110558786 A CN202110558786 A CN 202110558786A CN 113271004 A CN113271004 A CN 113271004A
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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
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Abstract
The invention belongs to the field of power supplies, and particularly relates to a high-precision software adjustable boosting power supply. The high-precision software adjustable boosting power supply comprises a digital-to-analog conversion module, a voltage following module and a boosting module; the digital-to-analog conversion module is connected with the upper computer through an SPI bus, receives a digital voltage signal sent by the upper computer and outputs a corresponding voltage signal to the voltage following module; the voltage following module outputs following voltage to a feedback control port of the boosting module; the boost module controls the on-off of the switch end and the GND according to the feedback voltage of the control end, so that the capacitor is charged to the target voltage through the boost circuit. The invention realizes voltage regulation by sending digital signals to the digital-to-analog conversion module, can realize program control, and overcomes the defects that the adjustable resistance scheme can not be controlled by software and the precision of a digital potentiometer is not high. The invention has the advantages of low cost, simple realization and high voltage regulation precision.
Description
Technical Field
The invention belongs to the field of power supplies, and particularly relates to a high-precision software adjustable boosting power supply.
Background
At present, the dc boost is to boost the lower dc voltage provided by the battery to the required voltage value, and the basic working processes are as follows: firstly, high-frequency oscillation generates low-voltage pulse, then a pulse transformer boosts the voltage to a preset voltage value, and finally the pulse is rectified to obtain high-voltage direct current, so that the direct current booster circuit belongs to one type of DC/DC circuits. In portable devices powered by batteries, the high voltage required in the circuit is obtained by a dc boost circuit, and these devices include: wireless communication devices such as cellular phones and pagers, as well as flash lights in cameras, portable video display devices, and the like. A typical boost circuit based on a switching power supply chip generally adopts two ways, the first way is to mechanically adjust the feedback ratio by using an adjustable feedback resistor, and the second way is to use a digital potentiometer as a feedback resistor, as shown in fig. 1. However, in the first mode, a mechanical knob is needed to adjust the resistor, and the voltage division ratio is changed to adjust the voltage; in the second method, although program control can be realized, the resolution of the digital potentiometer is not high enough, and the subdivision is too small, so that the accuracy of voltage adjustment is not high.
Disclosure of Invention
The invention aims to improve the voltage regulation precision of the adjustable boosting power supply and reduce the cost.
In order to achieve the aim, the invention provides a high-precision software adjustable boosting power supply which comprises a digital-to-analog conversion module, a voltage following module and a boosting module; the digital-to-analog conversion module is connected with the upper computer through an SPI bus, receives a digital voltage signal sent by the upper computer and outputs a corresponding analog voltage signal to the voltage following module; the voltage following module outputs following voltage to the boosting module; the boost module controls the on-off of the switch end and the GND according to the feedback voltage of the control end, so that the capacitor is charged to the target voltage through the boost circuit.
Furthermore, the digital-to-analog conversion module adopts an integrated digital-to-analog conversion chip, and the voltage following module adopts a general operational amplifier chip.
Further, the integrated digital-to-analog conversion chip is DAC8830, and the general operational amplifier chip is OP 777.
Furthermore, the boost module adopts an integrated boost control chip, wherein the reverse input end and the output end of the operational amplifier are directly connected, the output end of the integrated digital-to-analog conversion chip is connected with the homodromous input end of the operational amplifier, the operational amplifier plays a role in improving the current output capability, the feedback control end of the integrated boost control chip is positioned between the two resistors, the output voltage of the digital-to-analog conversion module is arranged on the other side of one resistor, the voltage after final boost is arranged on the other side of the other resistor, and the voltage Vout after final boost is completely determined by the digital-to-analog conversion module under the condition that the resistance values of the two resistors are determined according to the kirchhoff current law.
Further, the integrated boost control chip is PL2628, wherein the 2 nd pin and the 6 th pin of OP777 are connected and then connected to the 3 rd pin of PL2628 through a second resistor, the 3 rd pin of PL2628 is also connected to one end of a first resistor, the other end of the first resistor is connected to the cathode of the reverse current limiting diode and one end of a capacitor C1, the other end of the capacitor C1 is grounded, the 1 st pin of PL2628 is connected to the anode of the reverse current limiting diode and one end of an inductor L1, the 4 th pin and the 5 th pin of PL2628 are connected and then connected to the other end of an inductor L1 and one end of a capacitor C2, and the other end of a capacitor C2 is grounded.
Further, an input Value of a digital-to-analog conversion chip corresponding to a voltage Value pre-output by the adjustable boosting power supply is calculated on the upper computer through software, then the input Value is transmitted to the digital-to-analog conversion chip by using a protocol supported by the digital-to-analog conversion chip, and the digit of the input Value is determined by the digital-to-analog conversion chip. The protocol supported by the digital-to-analog conversion chip may be an SPI protocol.
Further, when the reference voltage Vref of the feedback control end of PL2628 is 3.3V and the digital-to-analog conversion chip is 16 bits, the following voltage Vdac output by the voltage following module is:
further, the boost module outputs a boost signal Vout as: vout ═ Vref + (Vref-Vdac) × (R21/R22), where R21 is the resistance value of the first resistor and R22 is the resistance value of the second resistor.
Advantageous effects
The invention adopts the operational amplifier to form the voltage follower to improve the load capacity of the reference voltage, so that the stability of the booster circuit is stronger. The invention realizes the high-precision program-controlled adjustable boosting power supply with lower cost and simpler circuit.
Drawings
Fig. 1 is a circuit diagram of a conventional adjustable boost power supply.
Fig. 2 is a schematic structural diagram of the high-precision software adjustable boosting power supply of the invention.
FIG. 3 is a circuit diagram of the high-precision software adjustable boost power supply of the present invention.
Detailed Description
Hereinafter, a detailed description will be given of a specific embodiment of the present invention with reference to the accompanying drawings.
As shown in FIG. 1, the output voltage of the conventional adjustable boosting power supply is
Wherein Vref is a resistance R1And a resistance R2The voltage of the connection point. Whether using adjustable resistors or using digital potentiometers instead of R1Or R2Essentially by varying the proportion of boost, i.e. R1/R2To change Vout.
The invention does not change R1、R2But by changing the voltage at the lower side of the second resistor, i.e. resistor R in fig. 12And a capacitor C2As a variable voltage V2Then the output voltage is
Can be changed by changing V2To regulate Vout.
As shown in fig. 2, the high-precision software-adjustable boost power supply of the present invention includes a digital-to-analog conversion module 1, a voltage following module 2, and a boost module 3; the digital-to-analog conversion module 1 is connected with an upper computer, receives a digital voltage signal sent by the upper computer, and outputs a corresponding analog voltage signal to the voltage following module 2; the voltage following module 2 outputs following voltage to the boosting module 3; the boost module 3 controls the on-off of the switch end and the GND according to the feedback voltage of the control end, so that the capacitor is charged to the target voltage through the boost circuit.
The digital-to-analog conversion module 1 adopts an integrated digital-to-analog conversion chip, and the voltage following module 2 adopts a general operational amplifier chip.
The boost module 3 adopts an integrated boost control chip, wherein, the reverse input end and the output end of the operational amplifier are directly connected, the output end of the integrated digital-to-analog conversion chip is connected with the homodromous input end of the operational amplifier, the operational amplifier plays a role of improving the current output capability, the feedback control end of the integrated boost control chip is positioned between two resistors, the other side of one resistor is the output voltage of the digital-to-analog conversion module 1, the other side of the other resistor is the voltage after final boost, according to kirchhoff current law, under the condition that the resistance values of the two resistors are determined, the voltage Vout after final boost is completely determined by the digital-to-analog conversion module 1.
Example one
The digital-to-analog conversion module 1 is realized by using a DAC8830, the DAC8830 is a 16-bit digital-to-analog conversion chip, and the output voltage of the DAC8830 is Vdac. The digital-to-analog conversion module 1 is connected with an upper computer through an SPI bus.
The voltage following module 2 is realized by adopting an OP777 operational amplifier, and the OP777 enables output to be equal to input through feedback, so that the function of improving the output capacity of the digital-to-analog conversion module 1 is achieved. That is, the load capacity of the reference voltage can be improved by the OP777, so that the stability of the booster circuit is stronger.
As shown in fig. 3, the boost module 3 employs a PL2628, wherein a 2 nd pin and a 6 th pin of the OP777 are connected and then connected to a 3 rd pin of the PL2628 through a second resistor, the 3 rd pin of the PL2628 is further connected to one end of a first resistor, the other end of the first resistor is connected to a cathode of the reverse current limiting diode and one end of a capacitor C1, respectively, the other end of the capacitor C1 is grounded, a 1 st pin of the PL2628 is connected to an anode of the reverse current limiting diode and one end of an inductor L1, a 4 th pin and a 5 th pin of the PL2628 are connected and then connected to the other end of the inductor L1 and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
And calculating an input Value of a digital-to-analog conversion chip corresponding to the voltage Value pre-output by the adjustable boosting power supply through software on the upper computer, and transmitting the input Value to the digital-to-analog conversion chip by using a protocol supported by the digital-to-analog conversion chip, wherein the digit of the input Value is determined by the digital-to-analog conversion chip.
The protocol supported by the digital-to-analog conversion chip can be an SPI protocol. The upper computer can be realized by adopting digital equipment such as an FPGA, a singlechip, a CPLD and the like.
The follow voltage output by the voltage follow module 2 is the same as the output voltage of the digital-to-analog conversion module 1, and is Vdac, and when the reference voltage Vref of the PL2628 feedback control end is 3.3V and the digital-to-analog conversion chip is 16 bits, the follow voltage Vdac output by the voltage follow module 2 is:
according to kirchhoff's current theorem, the boost module 3 outputs a boost signal Vout as follows: vout is Vref + (Vref-Vdac) × (R21/R22), where Vref is the voltage of PL2628 pin 3, R21 is the resistance of the first resistor, and R22 is the resistance of the second resistor.
PL2628 may be responsible for controlling the on/off of the inductor current in the boost circuit according to the voltage value of the feedback side, and the feedback control end of the feedback control end has a constant reference voltage, so that when Vdac changes, the output voltage Vout changes accordingly through a fixed voltage division ratio.
Example two
The digital-to-analog conversion module 1 is realized by using a DAC8831, the voltage following module 2 is realized by using an OP17-BJ operational amplifier, and the boosting module 3 is realized by using an LM2700 MT.
The high-precision software adjustable boosting power supply utilizes the digital-to-analog conversion chip, the graduation of the high-precision software adjustable boosting power supply can reach 24 bits, namely 16,777,216 graduation, and the digital potentiometer is usually dozens to several percent, so the graduation of the digital-to-analog conversion chip is far higher than that of a common digital potentiometer, and the precision of voltage adjustment can be effectively improved.
The invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (9)
1. The utility model provides an adjustable power that steps up of high accuracy software which characterized in that: the device comprises a digital-to-analog conversion module (1), a voltage following module (2) and a boosting module (3); the digital-to-analog conversion module (1) is connected with an upper computer through an SPI bus, receives a digital voltage signal sent by the upper computer and outputs a corresponding analog voltage signal to the voltage following module (2); the voltage following module (2) outputs following voltage to the boosting module (3); the boost module (3) controls the on-off of the switch end and the GND according to the feedback voltage of the control end, so that the capacitor is charged to the target voltage through the boost circuit.
2. The high-precision software adjustable boost power supply according to claim 1, characterized in that: the digital-to-analog conversion module (1) adopts an integrated digital-to-analog conversion chip, and the voltage following module (2) adopts a general operational amplifier chip.
3. A high accuracy software adjustable boost power supply according to claim 2, characterized by: the integrated digital-to-analog conversion chip is DAC8830, and the general operational amplifier chip is OP 777.
4. A high accuracy software adjustable boost power supply according to claim 3, characterized by: the boost module (3) adopts an integrated boost control chip, wherein the reverse input end and the output end of the operational amplifier are directly connected, the output end of the integrated digital-to-analog conversion chip is connected with the homodromous input end of the operational amplifier, the operational amplifier plays a role in improving the current output capacity, the feedback control end of the integrated boost control chip is positioned between two resistors, the output voltage of the digital-to-analog conversion module (1) is arranged on the other side of one resistor, the voltage after final boost is arranged on the other side of the other resistor, and the voltage Vout after final boost is completely determined by the digital-to-analog conversion module (1) under the condition that the resistance values of the two resistors are determined according to the kirchhoff current law.
5. The high-precision software adjustable boost power supply according to claim 4, characterized in that: the integrated boost control chip is a PL2628, wherein a 2 nd pin and a 6 th pin of the OP777 are connected and then connected to a 3 rd pin of the PL2628 through a second resistor, the 3 rd pin of the PL2628 is further connected to one end of a first resistor, the other end of the first resistor is respectively connected to a cathode of the reverse current limiting diode and one end of a capacitor C1, the other end of the capacitor C1 is grounded, a 1 st pin of the PL2628 is respectively connected to an anode of the reverse current limiting diode and one end of an inductor L1, a 4 th pin and a 5 th pin of the PL2628 are respectively connected to the other end of the inductor L1 and one end of the capacitor C2 after being connected, and the other end of the capacitor C2 is grounded.
6. The high-precision software adjustable boost power supply according to claim 5, wherein: and calculating an input Value of a digital-to-analog conversion chip corresponding to the voltage Value pre-output by the adjustable boosting power supply through software on the upper computer, and transmitting the input Value to the digital-to-analog conversion chip by using a protocol supported by the digital-to-analog conversion chip, wherein the digit of the input Value is determined by the digital-to-analog conversion chip.
7. The high-precision software adjustable boost power supply according to claim 6, characterized in that: the protocol supported by the digital-to-analog conversion chip is an SPI protocol.
8. The high-precision software adjustable boost power supply according to claim 6, characterized in that: when the reference voltage Vref of the feedback control end of PL2628 is 3.3V and the digital-to-analog conversion chip is 16 bits, the following voltage Vdac output by the voltage following module (2) is:
9. a high accuracy software adjustable boost power supply according to claim 8, characterized by: the boost module (3) outputs a boost signal Vout: vout ═ Vref + (Vref-Vdac) × (R21/R22), where R21 is the resistance value of the first resistor and R22 is the resistance value of the second resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110558786.9A CN113271004A (en) | 2021-05-21 | 2021-05-21 | Adjustable boost power supply of high accuracy software |
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| CN202110558786.9A CN113271004A (en) | 2021-05-21 | 2021-05-21 | Adjustable boost power supply of high accuracy software |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113988100A (en) * | 2021-10-28 | 2022-01-28 | 厦门印天电子科技有限公司 | Shelf positioning device and method for high-frequency RFID book label |
| CN114448208A (en) * | 2022-02-08 | 2022-05-06 | 索尔思光电（成都）有限公司 | Power supply device and method capable of changing output voltage |
| CN116841338A (en) * | 2023-05-31 | 2023-10-03 | 探维科技(苏州)有限公司 | Control method for power output precision and related equipment thereof |
| CN118539590A (en) * | 2024-07-26 | 2024-08-23 | 宜宾宜行汽车科技有限公司 | Scram protection circuit of intelligent charging pile |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113988100A (en) * | 2021-10-28 | 2022-01-28 | 厦门印天电子科技有限公司 | Shelf positioning device and method for high-frequency RFID book label |
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| CN118539590A (en) * | 2024-07-26 | 2024-08-23 | 宜宾宜行汽车科技有限公司 | Scram protection circuit of intelligent charging pile |
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Application publication date: 20210817 |