CN212850269U - High-power low-noise digital adjustable voltage source - Google Patents
High-power low-noise digital adjustable voltage source Download PDFInfo
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- CN212850269U CN212850269U CN202021325596.XU CN202021325596U CN212850269U CN 212850269 U CN212850269 U CN 212850269U CN 202021325596 U CN202021325596 U CN 202021325596U CN 212850269 U CN212850269 U CN 212850269U
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Abstract
The utility model particularly relates to a high-power low-noise digital adjustable voltage source, including DC-DC converting circuit, LDO linear voltage stabilizing circuit and MCU control circuit, DC-DC converting circuit's output is connected on an input of LDO linear voltage stabilizing circuit, two outputs of MCU control circuit are connected respectively on an input of DC-DC converting circuit and another input of LDO linear voltage stabilizing circuit, connect input voltage on another input of DC-DC converting circuit, this technical scheme's beneficial effect is: the invention has the advantages that the switch voltage reduction and the linear voltage stabilization are combined, and the output voltage is controlled by the MCU, thereby achieving the purpose of digital adjustment. The two parts of voltage reduction and the embedded controller are combined and packaged into a module, thereby greatly facilitating the development of electronic products. Under the condition of not influencing the regulation rate of the power supply load, the switch voltage reduction part adopts two-stage LC filtering, so that the ripple wave is further reduced.
Description
Technical Field
The utility model particularly relates to a high-power low noise digit adjustable voltage source.
Background
In analog circuits, the quality of the power supply directly affects the performance of the overall system. Engineers typically choose a linear regulator when powering devices that are sensitive to power supply noise. However, in a high current application, the linear regulator generates a large amount of heat, and the heat generation is increased when the voltage difference is larger. Therefore, the switching power supply is usually stepped down before the linear voltage stabilization stage. The complicated power supply structure greatly increases the work in the development of electronic products. Most of the existing power supply modules are switching power supplies, the ripple is large, and the application of noise sensitivity cannot be met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a weak point to prior art, provide a high-power low-noise digital adjustable voltage source to reach the purpose of having realized the output of heavy current under the prerequisite of low noise.
In order to achieve the above object, the utility model provides a following technical scheme: the output end of the DC-DC conversion circuit is connected to one input end of the LDO linear voltage stabilizing circuit, two output ends of the MCU control circuit are respectively connected to one input end of the DC-DC conversion circuit and the other input end of the LDO linear voltage stabilizing circuit, the other input end of the DC-DC conversion circuit is connected with an input voltage, the output end of the LDO linear voltage stabilizing circuit is connected to one input end of the MCU control circuit, and the other input end of the MCU control circuit is communicated with an external upper computer or a control panel through a serial port.
Preferably, the voltage reduction part of the DC-DC conversion circuit switch adopts an XL4015 chip.
Preferably, the LDO linear voltage stabilizing circuit adopts LT3042 as a controller.
Preferably, the MCU of the MCU control circuit is provided with an STM32 controller of the DAC, and communicates with the outside through a UART serial port.
Preferably, the MCU may set an output voltage of 0-18V. And the set voltage can be memorized by writing the flash inside the chip.
Compared with the prior art, the beneficial effect of this technical scheme is:
the invention has the advantages that the switch voltage reduction and the linear voltage stabilization are combined, and the output voltage is controlled by the MCU, thereby achieving the purpose of digital adjustment. The two parts of voltage reduction and the embedded controller are combined and packaged into a module, thereby greatly facilitating the development of electronic products. Under the condition of not influencing the regulation rate of the power supply load, the switch voltage reduction part adopts two-stage LC filtering, so that the ripple wave is further reduced.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention;
FIG. 2 is a flow chart of the present invention;
fig. 3 is a circuit diagram of the DC-DC converter circuit of the present invention;
fig. 4 is a circuit diagram of the LDO linear voltage stabilizing circuit of the present invention.
Detailed Description
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 work belong to the protection scope of the present invention.
Referring to fig. 1 to 2, the present invention provides a technical solution: a high-power low-noise digital adjustable voltage source comprises a DC-DC conversion circuit, an LDO linear voltage stabilizing circuit and an MCU control circuit, wherein an XL4015 chip is adopted in a switch voltage reduction part of the DC-DC conversion circuit.
The output end of the DC-DC conversion circuit is connected to one input end of the LDO linear voltage stabilizing circuit, and the LDO linear voltage stabilizing circuit adopts LT3042 as a controller.
Two output ends of the MCU control circuit are respectively connected to one input end of the DC-DC conversion circuit and the other input end of the LDO linear voltage stabilizing circuit, the other input end of the DC-DC conversion circuit is connected with an input voltage, the output end of the LDO linear voltage stabilizing circuit is connected to one input end of the MCU control circuit, and the other input end of the MCU control circuit is communicated with an external upper computer or a control panel through a serial port.
The MCU of the MCU control circuit is an STM32 controller with a DAC and communicates with the outside through a UART serial port. The MCU can set the output voltage of 0-18V. And the set voltage can be memorized by writing the flash inside the chip.
The utility model discloses the system comprises DC-DC converting circuit, the linear voltage stabilizing circuit of LDO, MCU control circuit. The DC-DC conversion circuit is responsible for reducing the input voltage by one step, and reducing the heating of linear voltage stabilization; the LDO linear voltage stabilizing circuit is used for filtering ripples of the preceding-stage voltage reduction and outputting constant low-noise voltage; the MCU is responsible for setting the output voltage of the DC-DC and the output voltage of the linear voltage stabilizer and is communicated with an external upper computer or a control panel through a serial port. The system can be connected with an 8V-30V power supply for voltage stabilization, and outputs low-noise voltage of 0V-18V, and the output current can reach 5A.
DC-DC switching step-down:
the switch voltage reduction part adopts XL4015, a P channel MOS tube is integrated on the chip, PMOS is used as a switch, the duty ratio can reach 100%, and the highest output voltage can be the same as the input voltage. The withstand voltage of each pin of the chip is up to 40V, and the chip has the advantages that other chips do not have when being externally connected with a feedback adjusting circuit.
VSET is connected to the DAC, and the output voltage is controlled by the MCU. The VFB voltage is 1.25V, and the equation I1+ I2 ═ I3, (VOUT-1.25V)/R1+ (VSET-1.25V)/R2 ═ 1.25V/R3 can be obtained from the VFB node, and VOUT and VSET are in a linear relationship, which is a great advantage in a numerical control system. The output voltage further reduces ripples through two-stage LC, and although this structure can reduce transient response, because the back-end still has linear steady voltage in this system, connects dynamic load, and the voltage regulation rate of whole system is not low.
The LDO linear voltage stabilizing circuit:
the LDO linear voltage stabilizing circuit part of the system adopts LT3042 as a controller, and the chip has extremely high ripple rejection ratio. Output voltage is adjusted through an external PNP triode, and under the condition that a high-power triode is used and heat dissipation is well performed, output current can reach 5A. The reference source of the LT3042 is directly led out to an external pin, so that an external reference can be directly led through the inside of the chip, and the digital signal processing chip is very suitable for being connected into a digital system.
MCU control circuit:
the control of the system is completed by an MCU (microprogrammed control Unit), and an STM32 controller with a DAC (digital-to-analog converter) in a chip is adopted. Through UART serial port and external communication, output voltage of 0-18V can be set. And the set voltage can be memorized by writing the flash inside the chip.
This technical scheme can realize: on the premise of not influencing the power supply load regulation rate, the invention adopts two stages of LC to filter the ripple waves of the switching power supply; the invention adopts an embedded controller to control the output voltage of the power supply; the invention realizes the output of large current on the premise of low noise.
The technical scheme has the following replaceable parts:
1. the DC-DC voltage reduction part chip can be replaced by other chips of the same type
2. The numerical control chip can be replaced by other types of MCU
3. The linear voltage stabilizing part can be replaced by other chips of the same type, but the performance is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A high-power low-noise digital adjustable voltage source is characterized in that: the output end of the DC-DC conversion circuit is connected to one input end of the LDO linear voltage stabilizing circuit, two output ends of the MCU control circuit are respectively connected to one input end of the DC-DC conversion circuit and the other input end of the LDO linear voltage stabilizing circuit, the other input end of the DC-DC conversion circuit is connected with input voltage, the output end of the LDO linear voltage stabilizing circuit is connected to one input end of the MCU control circuit, and the other input end of the MCU control circuit is communicated with an external upper computer or a control panel through a serial port.
2. The high power, low noise digitally adjustable voltage source of claim 1 wherein: and an XL4015 chip is adopted in the step-down part of the DC-DC conversion circuit switch.
3. The high power, low noise digitally adjustable voltage source of claim 1 wherein: the LDO linear voltage stabilizing circuit adopts LT3042 as a controller.
4. The high power, low noise digitally adjustable voltage source of claim 1 wherein: and the MCU of the MCU control circuit is an STM32 controller with a DAC and communicates with the outside through a UART serial port.
5. The high power, low noise digitally adjustable voltage source of claim 4, wherein: the MCU can set the output voltage of 0-18V and can write in the flash inside the chip to memorize the set voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021325596.XU CN212850269U (en) | 2020-07-08 | 2020-07-08 | High-power low-noise digital adjustable voltage source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021325596.XU CN212850269U (en) | 2020-07-08 | 2020-07-08 | High-power low-noise digital adjustable voltage source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572351A (en) * | 2021-07-22 | 2021-10-29 | 成都飞机工业（集团）有限责任公司 | EMI optimization circuit of GaN-based BUCK converter |
| WO2023040550A1 (en) * | 2021-09-17 | 2023-03-23 | Oppo广东移动通信有限公司 | Power supply apparatus, electronic device and power supply method |
-
2020
- 2020-07-08 CN CN202021325596.XU patent/CN212850269U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572351A (en) * | 2021-07-22 | 2021-10-29 | 成都飞机工业（集团）有限责任公司 | EMI optimization circuit of GaN-based BUCK converter |
| WO2023040550A1 (en) * | 2021-09-17 | 2023-03-23 | Oppo广东移动通信有限公司 | Power supply apparatus, electronic device and power supply method |
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