CN114448208B - A power supply device and method capable of changing output voltage - Google Patents
A power supply device and method capable of changing output voltage Download PDFInfo
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- CN114448208B CN114448208B CN202210120592.5A CN202210120592A CN114448208B CN 114448208 B CN114448208 B CN 114448208B CN 202210120592 A CN202210120592 A CN 202210120592A CN 114448208 B CN114448208 B CN 114448208B
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- external resistor
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- output voltage
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000007774 longterm Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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
-
- 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
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
-
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
本发明涉及一种可改变输出电压的电源装置及方法，该电源装置包括电源芯片，还包括外部电阻，所述电源芯片的反馈引脚连接所述外部电阻，改变所述外部电阻的参数来调节所述电源装置的输出电压。本发明电路的设计优点是增加极少量的外部器件，即可任意调节输出电压的大小，提高电路的兼容性，在电源芯片长时间极度缺货的大背景下，可大大降低供应链的风险。
The present invention relates to a power supply device and method capable of changing the output voltage. The power supply device comprises a power supply chip and an external resistor. The feedback pin of the power supply chip is connected to the external resistor. The output voltage of the power supply device is adjusted by changing the parameters of the external resistor. The design advantage of the circuit of the present invention is that the output voltage can be adjusted arbitrarily by adding a very small number of external devices, thereby improving the compatibility of the circuit. In the context of a long-term extreme shortage of power supply chips, the risk of the supply chain can be greatly reduced.
Description
Technical Field
The present invention relates to the field of power technologies, and in particular, to a power device and method capable of changing output voltage.
Background
A power chip is a component that provides an output voltage, and there are typically a large number of power chips that are versions that output a fixed voltage. For example, a power chip shown in fig. 1, with an input of 2.4-5.5V and a fixed output of 1.0V. Since the output voltage is fixed, a power chip can only be used in the corresponding voltage requirement application, and the use range of the power chip is greatly limited. At the moment of extremely shortage of power chips, how to improve the utilization rate of the power chips is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a power supply device and a method capable of changing output voltage so as to expand the application range of a power supply chip and improve the utilization rate of the power supply chip.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
The power supply device capable of changing the output voltage comprises a power supply chip and further comprises an external resistor, wherein a feedback pin of the power supply chip is connected with the external resistor, and parameters of the external resistor are changed to adjust the output voltage of the power supply device.
In one embodiment, the external resistor comprises a first external resistor, one end of the first external resistor is connected with the feedback pin of the power chip, and the other end of the first external resistor is connected with the switch output end of the power chip.
The first external resistor can be one resistor or a plurality of resistors connected in series, so that the combinability of the values of the first external resistor is improved, and the variety of the adjustable output voltage is improved.
In another embodiment, the external resistor further includes a second external resistor, one end of the second external resistor is connected with the feedback pin of the power chip, and the other end of the second external resistor is connected with the reference voltage.
The reference voltage can be provided by a digital-to-analog conversion DAC with adjustable voltage or can be fixed off-chip reference voltage, so that the flexibility of adjustable output voltage is improved and the cost is reduced.
On the other hand, the invention also provides a method for changing the output voltage of the power supply, wherein the feedback pin of the power supply chip is connected with an external resistor, and the output voltage of the power supply is adjusted by changing the parameters of the external resistor.
In one embodiment, the external resistor is a single resistor or a resistor unit formed by connecting a plurality of resistors in series, and the output voltage of the power supply is adjusted by changing the resistance value of the resistor or the resistor unit. By means of the implementation mode, any adjustment of the output voltage larger than that of the original power supply chip can be achieved.
In another embodiment, the external resistor comprises a first external resistor and a second external resistor, the second external resistor is connected with a reference voltage, the current flowing through the first external resistor is regulated by regulating the resistance values of the reference voltage and the second external resistor, and the output voltage of the power supply is regulated by regulating the resistance value of the first external resistor. By the implementation mode, the power supply device can output any voltage, and the application range of the power supply chip is further enlarged.
Compared with the prior art, the circuit has the beneficial effects that the design of the circuit has the advantages that a very small amount of external devices are added, so that the output voltage can be randomly regulated, the compatibility of the circuit is improved, and the risk of a supply chain can be greatly reduced under the large background of long-time extreme backdrop of a power supply chip.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 should not be considered as limiting the scope, and other related drawings can be obtained according to the drawings without inventive effort for a person skilled in the art, but all fall within the scope of protection of the present invention.
Fig. 1 is an electrical schematic diagram of a prior art power supply device.
Fig. 2 is an electrical schematic diagram of a power supply device in embodiment 1 of the present invention.
Fig. 3 is an internal configuration diagram of the power supply chip TPS 6208818.
Fig. 4 is an electrical schematic diagram of a power supply device in embodiment 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
The invention provides a power supply device capable of changing output voltage, which comprises a power supply chip and an external resistor, wherein a feedback pin of the power supply chip is connected with the external resistor, and the output voltage of the power supply device is adjusted by changing parameters of the external resistor.
In one embodiment, the external resistor is a single resistor or a resistor unit formed by connecting a plurality of resistors in series, and the output voltage of the power supply is adjusted by changing the resistance value of the resistor or the resistor unit.
In another embodiment, the external resistor comprises a first external resistor and a second external resistor, the second external resistor is connected with a reference voltage, the current flowing through the first external resistor is adjusted by adjusting the resistance values of the reference voltage and the second external resistor, and the output voltage of the power supply is adjusted by adjusting the resistance value of the first external resistor.
It should be noted that the first external resistor and the second external resistor may be one resistor respectively, or may be a resistor unit formed by connecting a plurality of resistors in series.
Two specific examples will be described in more detail below.
Example 1
Referring to fig. 2, the power supply device capable of changing output voltage provided in this embodiment includes a power chip, a resistor R3, a resistor R1, a capacitor one C1, a capacitor two C2, a capacitor three C3 and an inductor L1, wherein two ends of the resistor R3 are respectively connected to a power input pin VIN and a power indication pin PG of the power chip, one end of the capacitor one C1 is connected to the power input pin VIN of the power chip, and the other end is grounded. The switch output pin SW of the power chip is connected with one end of the inductor L1, the second capacitor C2, the third capacitor C3 and the resistor R1 are all connected with the other end of the inductor L1, and the other ends of the second capacitor C2 and the third capacitor C3 are grounded. The resistor R1 in fig. 2 may be a resistor, and the output voltage of the power supply device may be changed by changing the resistance value of the resistor R1, or the resistor R1 may be a resistor unit formed by connecting a plurality of resistors in series, and the output voltage of the power supply device may be changed by changing the combination of the resistor units (for example, the number of resistors connected in series).
The following description will take TPS6208818 of TI, and a power chip with a fixed output of 1.8V as an example. It is noted, however, that the inventive solution is not limited to TPS6208818 of TI, but is generally applicable to all power chips of this type of connection where Rup resistor pin P2 is connected to FB pin.
Fig. 3 is an internal block diagram of the power chip, and some labels are drawn on the figure for convenience of description. As described in the data manual of the power chip, the power chip outputs a version of 1.8V fixedly, and the internal S1 switch connects the FB pin to point P2, which is connected to an internal voltage regulating resistor network. The resistances Rup and Rdown of the internal resistance network are 5000k ohms and 2500k ohms, respectively, and the chip internal reference voltage V REF =0.6v.
Under the condition that the external resistor R1 is not arranged, the output voltage of the power supply chip can only be a fixed output voltage, and according to the node current theorem, vout=V REF+Rup*VREF/Rdown=0.6+5000×0.6/2500=1.8V.
After adding an external resistor R1, vout=v REF+(Rup+R1)*VREF/rdown=0.6+ (5000+r1) 0.6/2500=1.8+0.6×r1/2500 (equation 1) according to the node current theorem.
According to equation 1, the output voltage can be adjusted to be more than 1.8V by adjusting the size of the resistor R1, so that the flexibility of the circuit and the compatibility of the power chip are improved, and the pressure of the supply shortage of the power chip is relieved.
Example 2
Referring to fig. 4, the power supply device capable of changing output voltage provided in this embodiment includes a power chip, a resistor R3, a resistor R2, a resistor R1, a capacitor C2, a capacitor C3 and an inductor L1, wherein two ends of the resistor R3 are respectively connected to a power input pin VIN and a power indication pin PG of the power chip, one end of the capacitor C1 is connected to the power input pin VIN of the power chip, and the other end is grounded. The switch output pin SW of the power chip is connected with one end of the inductor L1, the second capacitor C2 and the third capacitor C3 are both connected with the other end of the inductor L1, and the other ends of the second capacitor C2 and the third capacitor C3 are grounded. One end of each of the resistor R1 and the resistor R2 is connected with a feedback pin FB of the power chip, the other end of the resistor R2 is connected with the reference voltage Vdac, and the other end of the resistor R1 is connected with one end of the inductor L1. The resistors R1 and R2 in FIG. 4 can be a resistor, the output voltage of the power supply device can be changed by changing the resistance value of the resistor, and the resistors R1 and R2 can be a resistor unit formed by connecting a plurality of resistors in series.
The reference voltage can be provided by a voltage-adjustable digital-to-analog conversion DAC or can be a fixed off-chip reference voltage, so that the flexibility of adjustable output voltage is improved and the cost is reduced.
By adjusting the parameters of the resistors R1, R2 and Vdac, the random adjustment of the output voltage can be realized, and the fixed voltage output chip can realize the function of the power supply chip capable of adjusting the output voltage.
In the following, a power chip with a fixed output of 1.8V will be described by taking TPS6208818 of TI as an example.
Fig. 3 is an internal block diagram of the power chip, and for convenience of description, some labels such as P1, S1, rup, etc. are drawn on the drawings.
As described in the data manual of the power chip, the power chip outputs a version of 1.8V fixedly, and the internal S1 switch connects the FB pin to point P2, which is connected to an internal voltage regulating resistor network. The resistances Rup and Rdown of the internal resistance network are 5000k ohms and 2500k ohms, respectively, and the chip internal reference voltage V REF =0.6v.
Under the condition that the external resistor R1 is not arranged, the output voltage of the power supply chip can only be a fixed output voltage, and according to the node current theorem, vout=V REF+Rup*VREF/Rdown=0.6+5000×0.6/2500=1.8V.
After increasing the external resistances R1, R2, and Vdac, equation 2 is followed according to node current theorem ,Vout＝(VREF+Rup*VREF/Rdown)+R1*{(VREF/Rdown+[(VREF+Rup*VREF/Rdown)-Vdac]/R2}().
After equation 2 is simplified and expanded, vout= (1.8+0.6×r1/2500+1.8×r1/R2) -vdac×r1/R2 (equation 3).
According to equation 3, the output voltage of the power supply chip can be adjusted by selecting the appropriate resistors R1 and R2 and adjusting the output voltage of Vdac.
For example, selecting the resistor r1=1500 k and r2=330 k, according to equation 3, vout= (1.8+0.6×1500/2500+1.8×1500/330) -vdac×1500/330) = 10.342-vdac×1500/330 (equation 4) can be obtained.
When Vdac with 12-bit resolution and 2.5V reference voltage is selected, vdac=2.5×dac/(2≡12-1), vout= 10.342-2.5×dac/(2≡12-1) ×1500/330= 10.342-0.002775×dac (equation 5 dac=0 to 4095 integer) is obtained by substituting equation 4.
According to equation 5, when vout=0v, dac=3727, when vout=3.3v, dac=2537, and DAC between 3727 and 2537 can adjust output voltage between 0 and 3.3V, flexibility of the circuit and compatibility of the power chip are improved, and supply shortage pressure of the power chip is relieved.
Application example 1 tps 6208518 the CDR chip requiring a supply voltage between 1.7 and 1.75V is powered, as shown in the following table, vdac uses a 2.5V reference power supply inside the MCU, and the output voltage can be regulated to within the target voltage by adjusting resistors R1 and R2.
| ICPN | Vdac | VFB | R1(kohm) | R2(kohm) | Vref | Rup(kohm) | Rdown(kohm) | Vout |
| TPS6208818 | 2.5 | 1.8 | 2010 | 510 | 0.6 | 5000 | 2500 | 1.745 |
Application example 2. Continuously adjustable voltage between 0 and 3.3 is required to be output by TPS6208818 for controlling the heating or cooling power of TEC, resistor R1=1500 k and R2=330 k are selected, 12-bit resolution is selected, vdac with reference voltage of 2.5V is selected, DAC is controlled to be changed between 3727 and 2537, continuous adjustment of output voltage between 0 and 3.3V can be realized, and control precision reaches 2.775mV.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.
Claims (5)
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| CN202210120592.5A CN114448208B (en) | 2022-02-08 | 2022-02-08 | A power supply device and method capable of changing output voltage |
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| CN202210120592.5A CN114448208B (en) | 2022-02-08 | 2022-02-08 | A power supply device and method capable of changing output voltage |
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| CN114448208B true CN114448208B (en) | 2025-03-04 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445097A (en) * | 2018-11-12 | 2019-03-08 | 重庆爱奇艺智能科技有限公司 | A kind of power supply unit and headset equipment |
| CN113271004A (en) * | 2021-05-21 | 2021-08-17 | 中国人民解放军战略支援部队航天工程大学 | Adjustable boost power supply of high accuracy software |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI394023B (en) * | 2010-01-11 | 2013-04-21 | Richtek Technology Corp | Mix mode wide range divider and method |
| CN103840662B (en) * | 2012-11-23 | 2017-11-14 | 联创汽车电子有限公司 | DC boosting chopper circuit |
| CN104300779B (en) * | 2014-10-21 | 2017-07-21 | 陕西华经微电子股份有限公司 | Output voltage meets the DC/DC converters of y=kx+b relations with regulation voltage |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445097A (en) * | 2018-11-12 | 2019-03-08 | 重庆爱奇艺智能科技有限公司 | A kind of power supply unit and headset equipment |
| CN113271004A (en) * | 2021-05-21 | 2021-08-17 | 中国人民解放军战略支援部队航天工程大学 | Adjustable boost power supply of high accuracy software |
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