Voltage regulation circuit

Abstract

The utility model discloses a voltage regulating circuit, which comprises a first voltage conversion module, a control module and a divider resistor, the control module comprises a digital-to-analog conversion unit, and the digital-to-analog conversion unit comprises a resistor position selection end which is used for controlling the number of resistors connected to the output end of the digital-to-analog conversion unit; the output end of the digital-to-analog conversion unit serves as the digital-to-analog conversion output end of the control module. The input end of the first voltage conversion module is connected with a power supply, the first end of the divider resistor is connected with the output end of the first voltage conversion module, and the second end of the divider resistor is connected with the output end of the digital-to-analog conversion unit and is connected with the feedback end of the first voltage conversion module; the first voltage conversion module is used for adjusting the output voltage according to the voltage of the feedback end. According to the technical scheme of the embodiment of the utility model, resources of the control module can be fully utilized, and multi-stage voltage output is realized. And additional control devices and resistors are not needed, so that the circuit structure can be simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic equipment, in particular to a voltage regulating circuit. Background Art

[0002] Modern electronic systems often require multiple different voltage levels for power supply. For example, a complex embedded system may require 3.3V, 5V, 12V or even higher or lower voltages to supply different subsystems or components.

[0003] A single DC-DC converter chip may not be able to efficiently provide multiple voltages, which will lead to energy waste and heat generation. Currently, the voltage regulation of DC-DC converter chips is usually achieved by controlling the feedback resistor through MOS tubes to achieve several voltage outputs, or by manually adjusting the output voltage through sliding rheostats, making the circuit structure more complicated. Utility Model Content

[0004] The utility model provides a voltage regulating circuit to realize multi-level voltage adjustment of the circuit, and the circuit structure is simple.

[0005] The utility model provides a voltage regulating circuit, comprising a first voltage conversion module, a control module and a voltage dividing resistor;

[0006] The control module includes a digital-to-analog conversion unit, and the digital-to-analog conversion unit includes a resistor position selection terminal for controlling the number of resistors connected to the output terminal of the digital-to-analog conversion unit; the output terminal of the digital-to-analog conversion unit serves as the digital-to-analog conversion output terminal of the control module;

[0007] The input end of the first voltage conversion module is connected to a power supply, the first end of the voltage divider resistor is connected to the output end of the first voltage conversion module, the second end of the voltage divider resistor is connected to the output end of the digital-to-analog conversion unit, and is connected to the feedback end of the first voltage conversion module, and the first voltage conversion module is used to adjust the output voltage according to the voltage of the feedback end.

[0008] Optionally, the digital-to-analog conversion unit includes 2 N resistors connected in series; wherein N is the number of bits of the digital-to-analog conversion unit.

[0009] Optionally, the digital-to-analog conversion unit further includes a first power supply terminal and a second power supply terminal, the first power supply terminal is suspended, and the second power supply terminal is connected to the ground terminal of the control module.

[0010] Optionally, the first voltage conversion module includes a DC-DC chip and an inductor, and the DC-DC chip includes a switch end; the switch end of the DC-DC chip serves as the switch end of the first voltage conversion module;

[0011] The first end of the inductor is connected to the switch end, and the second end of the inductor is connected to the input end of the first voltage conversion module.

[0012] Optionally, the voltage regulating circuit further includes a first filtering module and a second filtering module;

[0013] The first end of the first filter module is connected to the input end of the first voltage conversion module and to the power supply, the first end of the second filter module is connected to the output end of the first voltage conversion module, and the second end of the first filter module and the second end of the second filter module are grounded;

[0014] The first filtering module includes a first capacitor, and the second filtering module includes a second capacitor;

[0015] The first end of the first capacitor is connected to the input end of the first voltage conversion module and to the power supply, the first end of the second capacitor is connected to the output end of the first voltage conversion module, and the second end of the first capacitor and the second end of the second capacitor are grounded.

[0016] Optionally, the voltage regulation circuit further includes a second voltage conversion module;

[0017] The input end of the second voltage conversion module is connected to a power supply, and the output end of the second voltage conversion module is connected to the power supply end of the control module.

[0018] Optionally, the second voltage conversion module includes an LDO chip.

[0019] Optionally, the voltage regulating circuit further includes a first diode, a third filtering module and a fourth filtering module;

[0020] The first end of the first diode is connected to the power supply, the second end of the first diode is connected to the input end of the second voltage conversion module and the first end of the third filter module, the first end of the fourth filter module is connected to the output end of the second voltage conversion module and the power supply end of the control module, and the second end of the third filter module and the second end of the fourth filter module are grounded;

[0021] The third filtering module includes a third capacitor, and the fourth filtering module includes a fourth capacitor;

[0022] The first end of the third capacitor is connected to the second end of the first diode, the first end of the first diode is connected to the power supply, the first end of the fourth capacitor is connected to the output end of the second voltage conversion module and the power supply end of the control module, and the second end of the third capacitor and the second end of the fourth capacitor are grounded.

[0023] Optionally, the control module further includes a control terminal, and the first voltage conversion module further includes an enable terminal;

[0024] The control end is connected to the enable end and is used to enable or disable the output function of the first voltage conversion module.

[0025] Optionally, the voltage regulating circuit further includes a detection module; the control module further includes a detection end; a first end of the detection module is connected to the detection end, and a second end of the detection module is grounded; the detection end is used to perform a preset operation according to a detection signal of the detection module;

[0026] The detection module includes a first switch; a first end of the first switch is connected to the detection end, and a second end of the first switch is grounded.

[0027] The technical solution of the embodiment of the utility model can control the number of resistors connected to the output end of the digital-to-analog conversion unit through the resistor position selection end of the digital-to-analog conversion unit, and further divide the voltage with the voltage-dividing resistor, so that the output voltage of the first voltage conversion module can be adjusted. It can make full use of the resources of the control module, especially the digital-to-analog conversion unit inside the control module, realize a passive controllable resistor network, and realize multi-level voltage output. And no external control device and resistor are required, which can simplify the circuit structure.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of a voltage regulation circuit provided by an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of another voltage regulating circuit provided by an embodiment of the utility model;

[0032] Figure 3 A schematic diagram of the structure of another voltage regulating circuit provided by an embodiment of the utility model;

[0033] Figure 4A schematic diagram of the structure of another voltage regulating circuit provided by an embodiment of the utility model;

[0034] Figure 5 A schematic diagram of the structure of another voltage regulating circuit provided by an embodiment of the utility model;

[0035] Figure 6 A schematic diagram of the structure of another voltage regulation circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] Figure 1 A schematic diagram of a voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 1 The voltage regulation circuit includes a first voltage conversion module 10, a control module 20 and a voltage dividing resistor R; the control module 20 includes a digital-to-analog conversion unit 201, and the digital-to-analog conversion unit 201 includes a resistor position selection terminal 22, which is used to control the number of resistors connected to the output end of the digital-to-analog conversion unit 201; the output end of the digital-to-analog conversion unit 201 serves as the digital-to-analog conversion output terminal 23 of the control module 20; the input terminal 11 of the first voltage conversion module 10 is connected to the power supply VCC, the first end of the voltage dividing resistor R is connected to the output end 12 of the first voltage conversion module 10, the second end of the voltage dividing resistor R is connected to the output end of the digital-to-analog conversion unit 10, and is connected to the feedback end 13 of the first voltage conversion module 10, and the first voltage conversion module 10 is used to adjust the output voltage according to the voltage of the feedback end 13.

[0039] Among them, the first voltage conversion module 10 is used to convert the input voltage into a voltage with the same voltage as the load voltage. For example, the first electronic conversion module 10 can be used to increase, reduce or stabilize the voltage to meet the power supply requirements of different electronic devices and systems. The digital-to-analog conversion unit 201 is used to convert digital signals into analog signals. The control module 20 is used to implement control functions and data processing, for example, to implement real-time control functions, the control module 20 can respond to the input of external sensors or user commands, and control the state and behavior of peripheral devices in real time; and to implement logical control functions, the control module 20 implements complex logical functions through programming, processes data and takes corresponding control; and to implement data acquisition and processing functions, the control module 20 can receive analog signals and convert them into digital signals for processing, or process and analyze digital data; and to implement algorithm execution functions, the control module 20 executes various algorithms, such as digital filtering, control algorithms, data compression, etc., to meet the needs of different applications. Exemplarily, the control module 20 may include one of a microcontroller (MCU), a programmable logic controller (PLC), a digital signal processor (DSP) and a field programmable gate array (FPGA). The voltage-dividing resistor R is used to divide the voltage with the resistor connected to the output end of the control digital-to-analog conversion unit 201.

[0040] Specifically, the number of connected resistors can be selected through the resistor position selection terminal 22 of the digital-to-analog conversion unit 201, and then the connected resistors are divided by the voltage-dividing resistor R, so that the divided voltage is adjustable, and then the output voltage VOUT of the first voltage conversion module 10 is adjustable. Exemplarily, when the number of connected resistors is more through the resistor position selection terminal 22, the divided voltage of the voltage-dividing resistor R is smaller, so that the output voltage VOUT of the first voltage conversion module 10 is smaller; when the number of connected resistors is less through the resistor position selection terminal 22, the divided voltage of the voltage-dividing resistor R is larger, and the output voltage VOUT of the first voltage conversion module 10 is larger. And because the output end of the digital-to-analog conversion unit 201, the voltage-dividing resistor R and the feedback end 13 of the first voltage conversion module 10 are connected, the voltage feedback signal at the feedback end 13 is compared with the reference voltage of the first voltage conversion module 10 (usually provided by an internal reference voltage source). When there is a deviation between the feedback voltage and the reference voltage, the control circuit inside the first voltage conversion module 10 will adjust the duty cycle of the switching element or adjust the gain of the amplifier to correct the output voltage, thereby effectively maintaining the stability of the output voltage and ensuring the accuracy of the output voltage.

[0041] The technical solution of the embodiment of the utility model can control the number of resistors connected to the output end of the digital-to-analog conversion unit through the resistor position selection end of the digital-to-analog conversion unit, and further divide the voltage with the voltage-dividing resistor, so that the output voltage of the first voltage conversion module can be adjusted. It can make full use of the resources of the control module, especially the digital-to-analog conversion unit inside the control module, realize a passive controllable resistor network, and realize multi-level voltage output. And no external control device and resistor are required, which can simplify the circuit structure.

[0042] Figure 2 A schematic diagram of another voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 2 Based on the above embodiment, the digital-to-analog conversion unit 201 includes 2 N resistors R1 connected in series; wherein N is the number of bits of the digital-to-analog conversion unit 201.

[0043] Optionally, the digital-to-analog conversion unit 201 includes a gate switch 211 , a first end of the gate switch 211 is connected to the resistor position selection end 22 , and a second end of the gate switch 211 is connected to the output end of the digital-to-analog conversion unit 201 .

[0044] Specifically, the digital-to-analog conversion unit 201 includes 2 N The resistors R1 connected in series are selected by the resistor position selection terminal 22, that is, the number of resistors R1 connected is selected by the selection switch 211, and the resistance value of the series resistor is output through the output terminal of the digital-to-analog conversion unit 201, and is divided with the voltage-dividing resistor R. Exemplarily, when the number of bits of the digital-to-analog conversion unit 201 is 8 bits, the number of series resistors R1 is 256. If the number of resistors R1 selected to be connected through the resistor position selection terminal 22 is 60, and the resistors are sorted from 0 to 255 from top to bottom, the resistors R1 selected by the selection switch 211 are the resistors at the 196th to the 255th positions. At the same time, the number of resistors R1 selected to be connected through the resistor position selection terminal 22 is usually related to the voltage output range of the first voltage conversion module 10. For example, when the voltage output range of the first voltage conversion module 10 is 4.5V to 18V, the resistance value of the resistor R1 is 600Ω, and when the voltage dividing resistor R is set to 1MΩ, the output voltage formula of the first voltage conversion module 10 is:

[0045] VOUT=(1+r / r2)*VREF;

[0046] Wherein, VOUT is the voltage at the output end of the first voltage conversion module 10, r is the resistance of the voltage divider resistor R, r2 is the resistance after connecting multiple resistors R1 in series, and VREF is the reference voltage of the first voltage conversion module 10. Here, VREF is equal to 0.6V.

[0047] When the number of resistors R1 connected through the resistor position selection terminal 22 is 255, r2=255*600=153K, VOUT=(1+r / r2)*VREF=(1+1000K / 153K)*0.6V=4.52V; when the number of resistors R1 connected through the resistor position selection terminal 22 is 58, r2=255*600=34.8K, VOUT=(1+r / r2)*VREF=(1+1000K / 34.8K)*0.6V=17.84V.

[0048] That is, when the number of resistors R1 selected by the resistor position selection terminal 22 is 58 to 255, the output voltage of the first voltage conversion module 10 can be adjusted in multiple levels through the resistor position selection terminal 22 .

[0049] Optionally, continue to refer to Figure 2 The digital-to-analog conversion unit 201 also includes a first power supply terminal V SOURCE+ and the second power supply terminal V SOURCE- , the first power supply terminal V SOURCE+ The second power supply terminal V SOURCE- Connected to the ground terminal of the control module 20.

[0050] Among them, V SOURCE+ and V SOURCE- Usually refers to a voltage source used in circuit design and simulation software. In many electronic design software (such as SPICE simulation software), a power supply or voltage source is used to simulate an ideal power supply that provides a constant voltage output. SOURCE+ The second power supply terminal V SOURCE- The resistors R1 connected through the resistor position selection terminal 22 are all grounded, so that they are all passive controllable resistor networks.

[0051] Optionally, the digital-to-analog conversion unit 201 further includes a DAC1 positive source selection bit DAC1PSS<1:0>, a DAC1 negative source selection bit DAC1NSS, and a DAC1 enable bit DAC1EN.

[0052] Among them, the DAC1 positive source selection bit DAC1PSS<1:0> is used for the control bit or register bit for selecting the positive source in the DAC1 device. Exemplarily, the DAC1 positive source selection bit includes two bits, each of which can be 0 or 1. When the DAC1 positive source selection bit DAC1PSS<1:0> is 11, it means that the DAC1 positive source bit is reserved and not used; when the DAC1 positive source selection bit DAC1PSS<1:0> is 10, it means that the DAC1 positive source bit is a fixed voltage reference output; when the DAC1 positive source selection bit DAC1PSS<1:0> is 01, it means that the DAC1 positive source bit is the voltage reference positive pin; when the DAC1 positive source selection bit DAC1PSS<1:0> is 00, it means that the DAC1 positive source bit is connected to the system voltage of the control module 20. The DAC1 negative source selection bit DAC1NSS is usually used to control the selection of the negative source in the digital-to-analog conversion unit. Exemplarily, when the DAC1 negative source selection bit DAC1NSS is 1, it indicates that the DAC1 negative source is the voltage reference negative pin; when the DAC1 negative source selection bit DAC1NSS is 0, it indicates that the DAC1 negative source is grounded. The DAC1 enable bit DAC1EN is used to control the enablement of DAC1. Exemplarily, when the DAC1 enable bit DAC1EN is 1, it indicates that DAC1 is enabled and DAC1 can be used; when the DAC1 enable bit DAC1EN is 0, it indicates that DAC1 is disabled and DAC1 cannot be used.

[0053] Specifically, since the connected resistors R1 are all passive resistors, the DAC1 enable bit DAC1EN is configured to 1, so that the first power supply terminal V SOURCE+ and the second power supply terminal V SOURCE- And, the first power supply terminal V is selected by the DAC1 positive source selection bit DAC1PSS<1:0> SOURCE+ , and set the DAC1 positive source selection bit DAC1PSS<1:0> to 11, so that the first power supply terminal V SOURCE+ Also, by configuring the DAC1 negative source selection bit DAC1NSS to 0, the second power supply terminal V SOURCE- Ground. The resistors R1 of the digital-to-analog conversion unit 201 are all passive controllable resistors, and the number of connected resistors R1 can be selected through the resistor position selection terminal 22. By setting the resistor R1 as a passive resistor, it can avoid the influence of power supply fluctuations or electromagnetic interference, and its stability and reliability can be guaranteed. Secondly, the design of the passive resistor is simple and easy to integrate into the circuit, and does not require complex electronic control circuits or software programming.

[0054] Figure 3 A schematic diagram of another voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 3On the basis of the above embodiments, the first voltage conversion module 10 includes a DC-DC chip 101 and an inductor L1, and the DC-DC chip 101 includes a switch terminal 14; the switch terminal 14 of the DC-DC chip 101 serves as the switch terminal of the first voltage conversion module 10; the first end of the inductor L1 is connected to the switch terminal 14, and the second end of the inductor L1 is connected to the input terminal 11 of the first voltage conversion module 10.

[0055] Among them, the DC-DC chip 101 is used to convert the output direct current into direct current that matches the load voltage. The switch end of the first voltage conversion module 10 includes a switching element inside, and the switch is closed at a certain frequency. Specifically, when the switch end of the voltage conversion module 10 is opened, the inductor L1 has the function of storing energy, and there will be a certain current in the inductor at this time; when the switch end of the voltage conversion module 10 is disconnected, the current of the inductor cannot change suddenly, and it is discharged through the load to the ground to maintain the load operation, and it helps to reduce current ripple and interference. Through this setting, efficient energy conversion, smooth current, ripple reduction, and stable output voltage can be achieved, thereby ensuring circuit performance and reliability.

[0056] Figure 4 A schematic diagram of another voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 4 On the basis of the above embodiments, the voltage regulating circuit further includes: a first filtering module 30 and a second filtering module 40; a first end of the first filtering module 30 is connected to the input end 11 of the first voltage conversion module 10 and to the power supply VCC, a first end of the second filtering module 40 is connected to the output end 12 of the first voltage conversion module 10, a second end of the first filtering module 30 and a second end of the second filtering module 40 are grounded; the first filtering module 30 includes a first capacitor C1, and the second filtering module 40 includes a second capacitor C2; a first end of the first capacitor C1 is connected to the input end 11 of the first voltage conversion module 10 and to the power supply VCC, a first end of the second capacitor C2 is connected to the output end 12 of the first voltage conversion module 10, a second end of the first capacitor C1 and a second end of the second capacitor C2 are grounded.

[0057] The first capacitor C1 and the second capacitor C2 are used for filtering.

[0058] Specifically, when the DC-DC chip 101 inputs the power supply VCC, due to the presence of the first capacitor C1, the high-frequency noise and interference in the input power supply VCC can be filtered out, ensuring that the DC-DC chip 101 obtains a relatively stable and pure power supply signal. At the same time, the impact of electromagnetic interference from the power supply on the chip can be reduced, and the anti-interference ability of the system can be improved. When the DC-DC chip 101 outputs the power supply VOUT, due to the presence of the second capacitor C2, the ripple of the output voltage is reduced, making the output voltage more stable, which is beneficial to the load's requirements for the power supply, and the second capacitor C2 can buffer the change of the output voltage when the load is transient, ensuring that the load obtains a stable voltage. By setting the first capacitor and the second capacitor, the voltage at the input and output ends of the DC-DC chip can be filtered, stabilized, stabilized, and noise suppressed, thereby improving the performance and stability of the system.

[0059] Figure 5 A schematic diagram of another voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 5 On the basis of the above embodiments, the voltage regulation circuit further includes a second voltage conversion module 50; an input terminal 51 of the second voltage conversion module 50 is connected to a power supply VCC, and an output terminal 52 of the second voltage conversion module 50 is connected to a power supply terminal 24 of the control module 20.

[0060] The second voltage conversion module 50 is used to convert the input power source VCC into a power source VDD matching the voltage of the control module 20 .

[0061] Optionally, continue to refer to Figure 5 , the second voltage conversion module 50 includes an LDO chip 501.

[0062] The LDO (Low Dropout Linear Regulator) chip 501 is used to provide a stable voltage output to the control module 20. By providing the LDO chip, it is possible to ensure that the output voltage is always maintained at a stable level, so as to ensure that the control module 20 can operate at the required stable voltage.

[0063] Optionally, continue to refer to Figure 5The voltage regulating circuit also includes a first diode D1, a third filter module 60 and a fourth filter module 70; the first end of the first diode D1 is connected to the power supply VCC, the second end of the first diode D1 is connected to the input end 51 of the second voltage conversion module 50 and the first end of the third filter module 60, the first end of the fourth filter module 70 is connected to the output end 52 of the second voltage conversion module 50 and the power supply end 24 of the control module 20, and the second end of the third filter module 60 and the second end of the fourth filter module 70 are grounded; the third filter module 60 includes a third capacitor C3, and the fourth filter module 70 includes a fourth capacitor C4; the first end of the third capacitor C3 is connected to the second end of the first diode D1, the first end of the first diode D1 is connected to the power supply VCC, the first end of the fourth capacitor C4 is connected to the output end 52 of the second voltage conversion module 50 and the power supply end 24 of the control module 20, and the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are grounded.

[0064] The second end of the third capacitor C3 and the fourth capacitor C4 are used for filtering.

[0065] Specifically, when the LDO chip 501 inputs the power supply VCC, due to the presence of the third capacitor C3, the high-frequency noise and interference in the input power supply VCC can be filtered out, ensuring that the LDO chip 501 obtains a relatively stable and pure power supply signal. At the same time, the high-frequency noise in the input power supply VCC can be reduced from being transmitted to the LDO chip 501, thereby ensuring the stability and reliability of the LDO chip 501 when working. When the LDO chip 501 outputs the power supply VDD, due to the presence of the fourth capacitor C4, the ripple and noise of the LDO output voltage can be reduced. And the high-frequency interference caused by the internal circuit or load changes of the LDO regulator can be filtered out, making the output voltage more stable. By setting the third capacitor and the fourth capacitor, the circuit stability can be improved, the noise and ripple can be suppressed, and the processing capability of the transient response can be improved, thereby ensuring that the LDO chip stably and reliably provides the required stable voltage for the control module.

[0066] Figure 6 A schematic diagram of another voltage regulation circuit provided by an embodiment of the utility model, referring to Figure 6 On the basis of the above embodiments, the control module 20 further includes a control terminal 25, and the first voltage conversion module 10 further includes an enable terminal 15; the control terminal 25 is connected to the enable terminal 15 to enable or disable the output function of the first voltage conversion module 10.

[0067] Specifically, the control terminal 25 of the control module 20 is used to output a control signal, and the enable terminal 15 of the first voltage conversion module 10 enables or disables the output function of the first voltage conversion module 10 in response to the control signal. Exemplarily, when the control terminal 25 of the control module 20 is used to output a control signal to enable the first voltage conversion module 10, the first voltage conversion module 10 outputs voltage normally; when the control terminal 25 of the control module 20 is used to output a control signal to disable the first voltage conversion module 10, the first voltage conversion module 10 stops outputting voltage.

[0068] Optionally, continue to refer to Figure 6 The voltage regulation circuit also includes a detection module 80; the control module 20 also includes a detection terminal 26; a first end of the detection module 80 is connected to the detection terminal 26, and a second end of the detection module 80 is grounded; the detection terminal 26 is used to perform a preset operation according to a detection signal of the detection module 80; the detection module 80 includes a first switch S1; a first end of the first switch S1 is connected to the detection terminal 26, and a second end of the first switch S1 is grounded.

[0069] Among them, the preset operation can be specifically understood as an operation that can control the resistor position selection terminal 22 to select the number of resistors R1 connected to the output end of the digital-to-analog conversion unit 201. Specifically, the number of resistors R1 connected to the output end of the digital-to-analog conversion unit 201 can be selected by controlling the resistor position selection terminal 22 by judging the high and low levels of the detection terminal 26. Exemplarily, when the detection terminal 26 is at a high level, that is, when the first switch S1 is disconnected, the number of resistors R1 connected to the output end of the digital-to-analog conversion unit 201 can be increased by controlling the resistor position selection terminal 22; when the detection terminal 26 is at a low level, that is, when the first switch S1 is closed, the number of resistors R1 connected to the output end of the digital-to-analog conversion unit 201 can be reduced by controlling the resistor position selection terminal 22. By setting the first switch, the high and low levels of the detection terminal can be controlled, and then the number of resistors connected to the output end of the digital-to-analog conversion unit can be controlled, thereby improving the level of intelligence.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0071] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A voltage regulating circuit, characterized in that: include: A first voltage conversion module, a control module and a voltage dividing resistor; The control module includes a digital-to-analog conversion unit, and the digital-to-analog conversion unit includes a resistor position selection terminal for controlling the number of resistors connected to the output terminal of the digital-to-analog conversion unit; the output terminal of the digital-to-analog conversion unit serves as the digital-to-analog conversion output terminal of the control module; The input end of the first voltage conversion module is connected to a power supply, the first end of the voltage divider resistor is connected to the output end of the first voltage conversion module, the second end of the voltage divider resistor is connected to the output end of the digital-to-analog conversion unit, and is connected to the feedback end of the first voltage conversion module, and the first voltage conversion module is used to adjust the output voltage according to the voltage of the feedback end.

2. The voltage regulating circuit according to claim 1, characterized in that: The digital-to-analog conversion unit includes 2 N resistors connected in series; wherein N is the number of bits of the digital-to-analog conversion unit.

3. The voltage regulating circuit according to claim 1, characterized in that: The digital-to-analog conversion unit further includes a first power supply terminal and a second power supply terminal, wherein the first power supply terminal is suspended, and the second power supply terminal is connected to the ground terminal of the control module.

4. The voltage regulating circuit according to claim 1, characterized in that: The first voltage conversion module includes a DC-DC chip and an inductor, and the DC-DC chip includes a switch end; the switch end of the DC-DC chip serves as the switch end of the first voltage conversion module; The first end of the inductor is connected to the switch end, and the second end of the inductor is connected to the input end of the first voltage conversion module.

5. The voltage regulating circuit according to claim 1, characterized in that: Also includes: A first filtering module and a second filtering module; The first end of the first filter module is connected to the input end of the first voltage conversion module and to the power supply, the first end of the second filter module is connected to the output end of the first voltage conversion module, and the second end of the first filter module and the second end of the second filter module are grounded; The first filtering module includes a first capacitor, and the second filtering module includes a second capacitor; The first end of the first capacitor is connected to the input end of the first voltage conversion module and to the power supply, the first end of the second capacitor is connected to the output end of the first voltage conversion module, and the second end of the first capacitor and the second end of the second capacitor are grounded.

6. The voltage regulating circuit according to claim 1, characterized in that: Also includes a second voltage conversion module; The input end of the second voltage conversion module is connected to a power supply, and the output end of the second voltage conversion module is connected to the power supply end of the control module.

7. The voltage regulating circuit according to claim 6, characterized in that: The second voltage conversion module includes an LDO chip.

8. The voltage regulating circuit according to claim 7, characterized in that: Also includes a first diode, a third filter module and a fourth filter module; The first end of the first diode is connected to the power supply, the second end of the first diode is connected to the input end of the second voltage conversion module and the first end of the third filter module, the first end of the fourth filter module is connected to the output end of the second voltage conversion module and the power supply end of the control module, and the second end of the third filter module and the second end of the fourth filter module are grounded; The third filtering module includes a third capacitor, and the fourth filtering module includes a fourth capacitor; The first end of the third capacitor is connected to the second end of the first diode, the first end of the first diode is connected to the power supply, the first end of the fourth capacitor is connected to the output end of the second voltage conversion module and the power supply end of the control module, and the second end of the third capacitor and the second end of the fourth capacitor are grounded.

9. The voltage regulating circuit according to claim 1, characterized in that: The control module further includes a control terminal, and the first voltage conversion module further includes an enable terminal; The control end is connected to the enable end and is used to enable or disable the output function of the first voltage conversion module.

10. The voltage regulating circuit according to claim 1, characterized in that: It also includes a detection module; the control module also includes a detection end; the first end of the detection module is connected to the detection end, and the second end of the detection module is grounded; the detection end is used to perform a preset operation according to the detection signal of the detection module; The detection module includes a first switch; a first end of the first switch is connected to the detection end, and a second end of the first switch is grounded.

Images