CN115047933A - Dual-power supply device and method suitable for low-noise non-isolated analog-digital hybrid system - Google Patents
Dual-power supply device and method suitable for low-noise non-isolated analog-digital hybrid system Download PDFInfo
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- CN115047933A CN115047933A CN202210669526.3A CN202210669526A CN115047933A CN 115047933 A CN115047933 A CN 115047933A CN 202210669526 A CN202210669526 A CN 202210669526A CN 115047933 A CN115047933 A CN 115047933A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
Abstract
The double-power supply device and method suitable for the low-noise non-isolated analog-digital hybrid system, the device includes: the single power supply input filter circuit is used for filtering the frequency band which is not needed in the input single power supply; the single power supply to double power supply DC/DC circuit is used for converting the single power supply voltage after the single power supply input filter circuit filters into double power supply voltage; the dual-power-source-to-LDO 1 dual-power-source circuit is used for adjusting the dual-power-source voltage output by the single-power-source-to-dual-power-source DC/DC circuit to a proper voltage value and reducing ripples through the processing of a first-stage LDO; the LDO1 dual-power-to-LDO 2 dual-power-supply circuit is used for enabling the voltage output by the LDO1 dual-power-supply conversion circuit to be processed by a first-stage LDO so that the noise and ripple of the output voltage can meet the requirements of a high-speed analog circuit. The invention does not need to use an isolation module, does not introduce larger noise to an analog part, and can reduce the noise and ripple waves of the output power supply voltage on the premise of reducing the size of a printed circuit board.
Description
Technical Field
The invention belongs to the technical field of power supply of analog-digital hybrid systems, and particularly relates to a dual-power supply device and method suitable for a low-noise non-isolated analog-digital hybrid system.
Background
Due to the fact that technologies related to current high-performance products are more and more complex, the size of a printed circuit board is required to be smaller and smaller, and especially for high-speed analog signals, the sampling process of the whole system is inaccurate due to a slightly large amount of noise introduced into the system, the whole system cannot work due to serious possibility, and the main factor that noise can be introduced is caused by unstable power supply of the whole system. The power supply architecture is generally the core of the whole product system, and aiming at a system with low requirements, the noise of the power supply system is large and cannot influence the normal work of the circuit, and for a slightly complex system, once the architecture of the power supply system does not meet the requirements of the circuit, large noise can be introduced into the circuit, so that the system has no way to work normally. Therefore, the low noise and low ripple of the power supply for high-speed analog circuits are very important to the design of the circuit.
Most of the traditional analog circuit power supply adopts isolated power supply to completely separate an analog part from a digital part and avoid influencing the analog part, but the traditional analog circuit power supply has the defect that the size of an isolation module is generally larger, so that the system with small space requirement cannot be realized at all. However, if the conventional non-isolated design is adopted, the noise ratio introduced into the analog part is larger, and the influence on the system is larger.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a dual power supply apparatus and method suitable for a low-noise non-isolated analog-digital hybrid system, which can reduce noise and ripple of an output power voltage on the premise of reducing the size of a printed circuit board.
In order to achieve the purpose, the invention has the following technical scheme:
a dual power supply unit for a low noise non-isolated analog to digital hybrid system, comprising:
the single power supply input filter circuit is used for filtering an unnecessary frequency band in the input single power supply;
the single power supply to double power supply DC/DC circuit is used for converting the single power supply voltage after the single power supply input filter circuit filters into double power supply voltage;
the dual-power-source-to-LDO 1 dual-power-source circuit is used for adjusting the voltage value of dual-power-source voltage output by the single-power-source-to-dual-power-source DC/DC circuit and reducing ripples through the primary LDO treatment;
the LDO1 dual-power-to-LDO 2 dual-power-supply circuit is used for enabling the voltage output by the LDO1 dual-power-supply conversion circuit to be processed by a first-stage LDO so that the noise and ripple of the output voltage can meet the requirements of a high-speed analog circuit.
Preferably, the single power input filter circuit is composed of a filter capacitor and a filter inductor, the adopted filter mode is PI type filter, the withstand voltage of the filter capacitor is 2 times of the maximum value of the input single power, and the temperature rise current of the filter inductor is 1.5 times of the rated current of the single power input filter circuit.
Preferably, the filter capacitor comprises capacitors C1, C2, C3 and C4, and the filter inductor comprises inductors L1 and L2; the capacitors C1, C2, C3 and C4 are connected in parallel between the positive and negative circuits of the input single power supply; the inductor L1 and the inductor L2 are respectively arranged on a positive circuit and a negative circuit of an input single power supply in series, the inductor L1 is arranged on the positive circuit of the input single power supply between the capacitors C2 and C3, and the inductor L2 is arranged on the negative circuit of the input single power supply between the capacitors C2 and C3.
Preferably, the single-power-to-dual-power-supply DC/DC circuit is built by adopting an LT 8471 high-input-voltage step-down voltage stabilizer, the supported working modes comprise Buck, Boost, SEPIC, ZETA, Flyback and Inverting, the undervoltage and overvoltage protection function is realized, the input voltage range is 2.6V to 50V, and the output voltage range is adjustable.
Preferably, the single-power-to-dual-power DC/DC circuit adjusts the output voltage value in real time through a feedback resistor connected to a pin of the LT 8471 high-input voltage step-down regulator, and the pin of the LT 8471 high-input voltage step-down regulator is also connected with a power inductor and a freewheeling diode used for releasing energy for the power inductor.
Preferably, the pin of the LT 8471 high-input voltage step-down regulator is further connected with a resistor for selecting the working frequency of the chip.
Preferably, the dual-power-to-LDO 1 power supply circuit is built by using an LT 3032 positive linear regulator, the input voltage range is ± 2.3V to ± 20V, the output current is ± 150mA, the forward noise effective value is 20 micro-amplitude RMS, and the reverse noise effective value is 30 micro-amplitude RMS.
Preferably, the single-power-supply input filter circuit, the single-power-to-dual-power-supply DC/DC circuit, the dual-power-to-LDO 1 dual-power-supply circuit and the LDO1 dual-power-to-LDO 2 dual-power-supply circuit are all arranged on the PCB, the wiring of the PCB analog circuit is short and thick, and the design of the high-speed circuit considers the delay and the reference plane of the signal to ensure the integrity of the signal.
A dual power supply method suitable for a low-noise non-isolated analog-digital hybrid system comprises the following steps:
filtering out the unnecessary frequency band in the input single power supply through filtering;
converting the filtered single power supply voltage into a dual power supply voltage;
adjusting the voltage value of the voltage of the double power supplies, and reducing ripples through the first-stage LDO treatment;
and the dual-power voltage with the regulated voltage value and processed by the primary LDO is processed by the primary LDO, so that the noise and ripple waves of the output voltage meet the requirements of the high-speed analog circuit.
Compared with the prior art, the invention has the following beneficial effects:
the traditional analog circuit supplies power and uses an isolation module to completely separate an analog part from a digital part, and the size of the isolation module is large, so that the traditional analog circuit cannot be suitable for a system with small space requirement. The conventional non-isolated design introduces relatively large noise to the analog part, so that the requirements of low noise and low ripple of power supply of the high-speed analog circuit cannot be met. The invention provides a double-power-supply power supply device and a double-power-supply power supply method suitable for a low-noise non-isolated analog-digital hybrid system aiming at the characteristics of high-performance products.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall circuit structure of a dual power supply apparatus suitable for a low noise non-isolated analog-digital hybrid system according to the present invention;
FIG. 2 is a schematic diagram of a single power input filter circuit of the present invention;
FIG. 3 is a schematic diagram of a single power supply to dual power DC/DC circuit of the present invention;
FIG. 4 is a schematic diagram of a dual power supply to LDO1 dual power supply circuit of the present invention;
FIG. 5 is a schematic diagram of a circuit for switching from two LDO1 power supplies to two LDO2 power supplies according to 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 some, not all, embodiments of the present invention.
Based on the embodiments of the present invention, those skilled in the art can make several simple modifications and decorations without creative efforts, and all other embodiments obtained belong to the protection scope of the present invention.
Reference in the present specification to "an example" means that a particular feature, structure, or characteristic described in connection with the example may be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by a person skilled in the art that the embodiments described in the present invention can be combined with other embodiments.
Referring to fig. 1, the dual power supply device of the embodiment of the invention is suitable for a low-noise non-isolated analog-digital hybrid system, and mainly comprises a single power input filter circuit 1, a single power-to-dual power DC/DC circuit 2, a dual power-to-LDO 1 dual power circuit 3, and a LDO1 dual power-to-LDO 2 dual power circuit 4, wherein the single power input filter circuit 1 is used for filtering out an unnecessary frequency band in an input single power; the single power supply to double power supply DC/DC circuit 2 is used for converting the single power supply voltage filtered by the single power supply input filter circuit 1 into double power supply voltage; the dual-power-source-to-LDO 1 dual-power-source circuit 3 is used for adjusting the dual-power-source voltage output by the single-power-source-to-dual-power-source DC/DC circuit 2 to a proper voltage value and reducing ripples through the processing of a first-level LDO; and the LDO1 dual-power-to-LDO 2 dual-power-supply circuit 4 is used for processing the voltage output by the LDO1 dual-power-supply conversion circuit 3 through a first-stage LDO so that the noise and ripple of the output voltage meet the requirements of the high-speed analog circuit 5.
Referring to fig. 2, the single power input filter circuit 1 of the present invention mainly functions to attenuate high frequency noise entering the system from the outside to minimize the harmonic effect, and in an optional embodiment, the single power input filter circuit 1 is composed of a filter capacitor and a filter inductor, the adopted filter mode is PI type filter, the withstand voltage of the filter capacitor is 2 times of the maximum value of the input single power, and the temperature rise current of the filter inductor is 1.5 times of the rated current of the single power input filter circuit 1.
Furthermore, the filter capacitor of the embodiment in fig. 2 includes capacitors C1, C2, C3, and C4, and the filter inductor includes inductors L1 and L2; the capacitors C1, C2, C3 and C4 are connected in parallel between the positive and negative circuits of the input single power supply; the inductor L1 and the inductor L2 are respectively arranged on a positive electrode circuit and a negative electrode circuit of an input single power supply in series, the inductor L1 is arranged on the positive electrode circuit of the input single power supply between the capacitors C2 and C3, and the inductor L2 is arranged on the negative electrode circuit of the input single power supply between the capacitors C2 and C3.
Referring to fig. 3, the single-power-to-dual-power DC/DC circuit 2 of the present invention mainly functions to obtain a corresponding dual-power circuit by performing circuit-related conversion on an input power filtered from a higher-level circuit, and in a possible embodiment, an LT 8471 high-input-voltage step-down regulator is used to build up, and the supported operating modes include Buck, Boost, SEPIC, ZETA, Flyback, and Inverting, and have under-voltage and over-voltage protection functions, the input voltage range is 2.6V to 50V, the output voltage range is adjustable, and the output voltage range is mainly adjusted by feedback resistors R14, R16, R21, and R23 shown in fig. 3, so as to adjust the output voltage value in real time, diodes D6 and D7 are freewheeling diodes, and mainly power inductors L16 and L17 release energy for use, the resistor R24 mainly selects the operating frequency of a chip, and in order to meet the load loading requirement of the system, the resistor needs to be debugged according to the actual requirement, under the condition of meeting the design requirement of a system, the burrs of the waveform are reduced as much as possible so as to avoid bringing the problem of electromagnetic compatibility. The current output by the LT 8471 high-input voltage step-down voltage stabilizer reaches 2A, the switching frequency setting range is 100KHz to 2MHz, the voltage conversion of the output voltage is realized by adopting an MOS switch, so the ripple and harmonic waves in the output voltage value are large, the high-speed sampling system cannot work normally by directly supplying power to an analog circuit, and a circuit at the rear stage is required for filtering.
Referring to fig. 4, the dual power supply to LDO1 dual power supply circuit 3 of the present invention mainly has two functions, one of which is to adjust the voltage of the dual power supply of the previous stage to a suitable voltage value through a voltage reduction module in the circuit, and the other is to filter out the large ripple and harmonic generated by the previous stage, so as to better meet the design requirements of the analog circuit. In a possible implementation manner, the dual power supply to LDO1 dual power supply circuit 3 is built by using an LT 3032 positive linear regulator, the input voltage range is ± 2.3V to ± 20V, the output current is ± 150mA, the noise of the LT 3032 positive linear regulator is very low, the positive noise effective value is 20 micro-amplitude RMS, the inverse noise effective value is 30 micro-amplitude RMS, but for an analog circuit requiring a high speed and low voltage, the voltage of this stage still cannot meet the system design requirement, and a subsequent stage circuit is required to continue to perform related processing on the power supply.
Referring to fig. 5, the main function of the LDO1 dual power supply to LDO2 dual power supply circuit 4 is to filter the ripple and harmonic component of the voltage of the previous stage again, so that the filtered voltage value meets the requirement of a high-speed low-voltage analog circuit.
By the double-power-supply design of the low-noise non-isolated analog-digital hybrid system, an analog circuit meeting high speed and low voltage can be designed on the premise that the whole printed circuit board is smaller in size, and more possibilities are brought to system selection.
While the invention has been described above with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, and those modifications and variations are within the scope of the claims of the invention and their equivalents.
Claims (9)
1. A dual power supply unit suitable for a low noise non-isolated analog-to-digital hybrid system, comprising:
the single power supply input filter circuit (1) is used for filtering the frequency band which is not needed in the input single power supply;
the single power supply to double power supply DC/DC circuit (2) is used for converting the single power supply voltage filtered by the single power supply input filter circuit (1) into double power supply voltage;
the dual-power-source-to-LDO 1 dual-power-source circuit (3) is used for adjusting the voltage value of dual-power-source voltage output by the single-power-source-to-dual-power-source DC/DC circuit (2) and reducing ripples through the processing of a first-level LDO;
the LDO1 dual-power-to-LDO 2 dual-power-supply circuit (4) is used for enabling the voltage output by the LDO1 dual-power-supply switching circuit (3) to be processed by a first-stage LDO so that the noise and ripple of the output voltage can meet the requirements of the high-speed analog circuit (5).
2. The dual power supply device of claim 1, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the single power input filter circuit (1) is composed of a filter capacitor and a filter inductor, the adopted filter mode is PI type filter, the withstand voltage of the filter capacitor is 2 times of the maximum value of the input single power, and the temperature rise current of the filter inductor is 1.5 times of the rated current of the single power input filter circuit (1).
3. The dual power supply device of claim 2, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the filter capacitor comprises capacitors C1, C2, C3 and C4, and the filter inductor comprises inductors L1 and L2; the capacitors C1, C2, C3 and C4 are connected in parallel between the positive and negative circuits of the input single power supply; the inductor L1 and the inductor L2 are respectively arranged on a positive circuit and a negative circuit of an input single power supply in series, the inductor L1 is arranged on the positive circuit of the input single power supply between the capacitors C2 and C3, and the inductor L2 is arranged on the negative circuit of the input single power supply between the capacitors C2 and C3.
4. The dual power supply device of claim 1, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the single-power-to-dual-power-supply DC/DC circuit (2) is built by adopting an LT 8471 high-input-voltage step-down voltage stabilizer, the supported working modes comprise Buck, Boost, SEPIC, ZETA, Flyback and Inverting, the undervoltage and overvoltage protection function is realized, the input voltage range is 2.6V to 50V, and the output voltage range is adjustable.
5. The dual power supply device of claim 4, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the single-power-to-dual-power DC/DC circuit (2) adjusts the output voltage value in real time through a feedback resistor connected to a pin of the LT 8471 high-input voltage step-down voltage regulator, and the pin of the LT 8471 high-input voltage step-down voltage regulator is also connected with a power inductor and a freewheeling diode used for releasing energy for the power inductor.
6. The dual power supply device of claim 4, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the pin of the LT 8471 high-input voltage step-down voltage regulator is also connected with a resistor for selecting the working frequency of the chip.
7. The dual power supply device suitable for the low noise non-isolated analog-digital hybrid system according to claim 1, wherein: the dual-power-source-to-LDO 1 dual-power-source circuit (3) is built by adopting an LT 3032 positive linear voltage regulator, the input voltage range is +/-2.3V to +/-20V, the output current is +/-150 mA, the forward noise effective value is 20 micro-amplitude RMS, and the reverse noise effective value is 30 micro-amplitude RMS.
8. The dual power supply device of claim 1, wherein the dual power supply device is adapted to a low noise non-isolated analog-to-digital hybrid system, and comprises: the single power input filter circuit (1), the single power-to-dual power DC/DC circuit (2), the dual power-to-LDO 1 dual power circuit (3) and the LDO1 dual power-to-LDO 2 dual power circuit (4) are all arranged on the PCB, wiring of the PCB analog circuit is short and thick, delay and a reference plane of a signal are considered in the design of a high-speed circuit, and the integrity of the signal is guaranteed.
9. A dual power supply method suitable for a low-noise non-isolated analog-digital hybrid system is characterized by comprising the following steps:
filtering out the unnecessary frequency band in the input single power supply through filtering;
converting the filtered single power supply voltage into a dual power supply voltage;
adjusting the voltage value of the voltage of the double power supplies, and reducing ripples through the first-stage LDO treatment;
the dual-power voltage which is adjusted in voltage value and processed by the first-stage LDO is processed by the first-stage LDO, so that the noise and ripple waves of the output voltage meet the requirements of the high-speed analog circuit (5).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201256354Y (en) * | 2008-09-22 | 2009-06-10 | 北京英赛德佳科技有限公司 | Multiple output switch electric power |
| CN104660037A (en) * | 2013-11-25 | 2015-05-27 | 哈尔滨功成科技创业投资有限公司 | Low ripple power supply for high precision data acquisition system |
| US20200127581A1 (en) * | 2018-01-09 | 2020-04-23 | Qingdao University | Single-stage multi-input forward dc-dc chopper type high-frequency link's inverter with series simultaneous power supply |
| CN213189711U (en) * | 2020-03-20 | 2021-05-14 | 广东工业大学 | Portable ultrasonic imaging front-end system |
| CN114563072A (en) * | 2022-03-15 | 2022-05-31 | 南京邮电大学 | Vehicle-mounted high-precision real-time weighing device convenient to disassemble and assemble |
-
2022
- 2022-06-14 CN CN202210669526.3A patent/CN115047933A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201256354Y (en) * | 2008-09-22 | 2009-06-10 | 北京英赛德佳科技有限公司 | Multiple output switch electric power |
| CN104660037A (en) * | 2013-11-25 | 2015-05-27 | 哈尔滨功成科技创业投资有限公司 | Low ripple power supply for high precision data acquisition system |
| US20200127581A1 (en) * | 2018-01-09 | 2020-04-23 | Qingdao University | Single-stage multi-input forward dc-dc chopper type high-frequency link's inverter with series simultaneous power supply |
| CN213189711U (en) * | 2020-03-20 | 2021-05-14 | 广东工业大学 | Portable ultrasonic imaging front-end system |
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