CN112350575A - Buck circuit for dynamically adjusting output voltage and dynamic adjusting method - Google Patents
Buck circuit for dynamically adjusting output voltage and dynamic adjusting method Download PDFInfo
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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
- 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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- 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
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Abstract
The invention provides a Buck circuit for dynamically adjusting output voltage and a dynamic adjusting method, wherein the Buck circuit comprises a power chip, a current detection module, an operational amplification module, a divider resistance adjusting module and a feedback resistance module; the current detection module is used for detecting the output current of the power supply chip; the operational amplification module is used for receiving the current detected by the current detection module, processing the detected current by the operational amplifier and outputting a control signal in real time; and the divider resistance adjusting module is used for controlling the switch of the divider resistance adjusting module according to the control signal output by the operational amplification module so as to adjust the output voltage. And voltage adjustment is carried out according to whether the current exceeds a light and heavy load current threshold of the power supply chip, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the divider resistor adjusting module is controlled, the light and heavy load voltage values of the output voltage are kept the same, and the output voltage is kept unchanged during light and heavy load switching.
Description
Technical Field
The invention relates to the technical field of dynamic regulation of output voltage of a Buck circuit, in particular to a Buck circuit for dynamically regulating output voltage according to light and heavy loads and a dynamic regulation method.
Background
With the rise of big data, cloud computing and AI, the demand of the server is increasing, and the power consumption of the server is also increasing. In order to deal with sudden operation and memory volume increase of double-11 rush purchase, a plurality of servers are in a standby state, the servers in the standby state are in a light-load working mode, and the efficiency of power supply conversion under light load of the power supply in the servers needs to be improved in the aspect of energy conservation and emission reduction.
After the existing server enters a light load or standby mode, all parts enter a low power consumption state, and all internal power supplies enter the light load state. In order to improve the efficiency of light load, the current of a part of power supply chips of the Buck circuit is lower than a certain value, and the working state of the circuit enters a Skip Mode or a Pulse Skip Mode (PSM) Mode to improve the conversion efficiency of the power supply and reduce energy consumption.
The power supply chip of part Buck step-down circuit all has the PSM mode, and after entering the PSM mode of power saving, the efficiency of circuit can be higher than the FCCM mode, but after the power enters the PSM mode, the voltage value when the output mains voltage can be higher than the heavy load, generally can be higher by 0-20 mV. The fluctuation of the voltage cannot influence most electric equipment, when the PSM enters a heavy-load mode, the precision requirement of partial chips or electric equipment on the voltage is higher, so that the circuit has to ensure that the voltage chip of the Buck power supply cannot enter the PSM in a light-load mode, but always works in a Forced Continuous Conduction Mode (FCCM), the voltage precision of the output voltage under light and heavy loads is inconsistent, and the efficiency of power supply conversion is low.
Disclosure of Invention
For a chip or a device with higher power supply requirement, after the chip or the device enters a light load working mode, the invention provides a Buck circuit for dynamically regulating output voltage and a dynamic regulation method, in order to solve the problem that the voltage precision of the regulated output voltage under light load and heavy load is inconsistent.
The technical scheme of the invention is as follows:
on one hand, the technical scheme of the invention provides a Buck circuit for dynamically adjusting output voltage, which comprises a power chip, a current detection module, an operational amplification module, a divider resistance adjustment module and a feedback resistance module;
the power supply chip is connected with the current detection module;
the current detection module is connected with the operational amplification module;
the operational amplification module is connected with the divider resistance adjustment module;
the feedback resistance module is respectively connected with the power chip, the current detection module and the divider resistance adjusting module;
the current detection module is used for detecting the output current of the power supply chip;
the operational amplification module is used for receiving the current detected by the current detection module, processing the detected current by the operational amplifier and outputting a control signal in real time; the method comprises the steps of firstly calculating a current threshold value of the light/heavy load work of the circuit, processing the current detected by a current detection module, and outputting the potential change of a control signal by an operational amplifier when the current reaches the current threshold value.
And the divider resistance adjusting module is used for controlling the switch of the divider resistance adjusting module according to the control signal output by the operational amplification module so as to adjust the output voltage.
When the Buck circuit works, the current detection module continuously detects output current, when the current is lower than a set threshold value, the circuit enters a light load state, the control signal is pulled down, the control signal controls the voltage dividing resistance regulation module to be closed, the output voltage is reduced, and the voltage reduction regulation is completed. When the current detection module detects that the current is not lower than the threshold value, the circuit enters a heavy load mode, the control signal is pulled up, the control signal controls the voltage division resistor adjusting module to be started, after the voltage division resistor is adjusted, the output voltage is increased, and the boosting adjusting process is completed.
Preferably, the circuit further comprises an output inductance;
the first end of the output inductor is connected with the power supply chip, and the second end of the output inductor is connected with the current detection module; the second end of the output inductor is grounded through a feedback resistance module, and the feedback resistance module is connected with the power supply chip. The output inductor is used for filtering the output signal.
Preferably, the current detection module includes a resistor R3, a first end of the resistor R3 is connected to a second end of the output inductor, and a second end of the resistor R3 is an output end of the Buck circuit; the operational amplification module is connected to two ends of the resistor R3. The resistor R3 is a precision resistor for detecting the output current of the circuit.
Preferably, the operational amplification module comprises an operational amplifier, a resistor R5 and a resistor R6;
the resistor R5 and the resistor R6 are connected in series and then connected in parallel at two ends of the resistor R3, a connection point of the resistor R5 and the resistor R6 is connected to a positive input end of the operational amplifier, a connection point of the resistor R6 and a second end of the resistor R3 is connected to a negative input end of the operational amplifier, and an output end of the operational amplifier is connected to the divider resistor adjusting module. And adjusting the values of the resistor R5 and the resistor R6 according to the current threshold value of the light/heavy load of the power chip. When the detected current is larger than the current threshold of the light load and the heavy load of the power supply chip, the control signal output by the operational amplifier is at a high level; when the detected current is less than or equal to the light/heavy load current threshold, the control signal changes to a low level.
Preferably, the voltage division resistance adjusting module comprises a resistor R4 and a MOS (metal oxide semiconductor) tube;
the output end of the operational amplifier is connected to the grid electrode of the MOS tube, and the drain electrode of the MOS tube is connected to the connecting point of the feedback resistance module and the power supply chip through a resistor R4; the source electrode of the MOS tube is grounded.
Preferably, the feedback resistance module comprises a resistor R1 and a resistor R2 connected in series;
the resistor R1 is connected with the second end of the output inductor, and the connection point of the resistor R1 and the resistor R2 is connected to the power supply chip; the drain of the MOS transistor is connected to the connection point of the resistor R1 and the resistor R2 through the resistor R4.
When the Burk circuit enters light load operation, the control signal is at low level, and after the MOS tube is closed, the voltage of Vout is determined by the resistor R1 and the resistor R2; when the Burk circuit enters the heavy load mode, the control signal is changed into high level, the MOS tube is started, and the voltage of Vout is determined by the resistor R2 and the resistor R4 which are connected in parallel.
Preferably, the input terminal of the power supply chip is connected to a power supply;
the input end of the power supply chip is grounded through an input filter capacitor;
the output end of the Buck circuit is grounded through an output filter capacitor.
On the other hand, the technical scheme of the invention provides a Buck circuit output voltage dynamic regulation method, which is applied to a Buck circuit for dynamically regulating output voltage, wherein the Buck circuit comprises a power chip, a current detection module, an operational amplification module, a voltage division resistance regulation module and a feedback resistance module; the power supply chip is connected with the current detection module; the current detection module is connected with the operational amplification module; the operational amplification module is connected with the divider resistance adjustment module; the feedback resistance module is respectively connected with the power chip, the current detection module and the divider resistance adjusting module; the method comprises the following steps:
when the Buck circuit works, the current detection module continuously detects output current;
inputting the detected current into an operational amplification module;
the operational amplification module adjusts and outputs a control signal according to the current threshold value of the power supply chip in the light load state or the heavy load state;
the on/off of the divider resistance adjusting module is controlled by the control signal output by the operational amplifying module, so that the adjustment of the output voltage is completed.
Preferably, the step of adjusting and outputting the control signal by the operational amplification module according to the current threshold of the power chip entering the light load state or the heavy load state includes:
the operational amplification module compares the received detected output current with a current threshold;
when the detected output current is smaller than the current threshold, the circuit is indicated to enter a light load state, and the operational amplification module outputs a control signal to be a low level by adjusting the resistance value of the resistor;
when the detected output current is larger than or equal to the current threshold, the circuit is indicated to enter a heavy-load mode, and the operational amplification module outputs a control signal to be a high level by adjusting the resistance value of the resistor.
Preferably, the step of controlling the voltage dividing resistance adjusting module to close by the control signal output by the operational amplifying module and completing the adjustment of the output voltage includes:
when the divider resistance adjusting module receives that the control signal output by the operational amplification module is at a low level, the low level control signal controls the divider resistance adjusting module to be closed, the output voltage is reduced, and the voltage reduction adjustment of the output voltage is completed;
when the divider resistance adjusting module receives that the control signal output by the operational amplification module is at a high level, the high level control signal controls the divider resistance adjusting module to be started, and after the divider resistance is adjusted, the output voltage rises to complete the boost adjustment of the output voltage.
The output current of the Buck circuit is detected, voltage adjustment is carried out according to whether the current exceeds a light and heavy load current threshold value of the power supply chip, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the divider resistor adjusting module is controlled, the corresponding divider resistor adjusting amplitude is set according to the actual light and heavy load voltage change value of the power supply chip, the light and heavy load voltage value of the output voltage is kept the same, and the output voltage precision is improved.
According to the technical scheme, the invention has the following advantages: the output current of the Buck circuit is detected, voltage adjustment is carried out according to whether the current exceeds a light and heavy load current threshold value of the power supply chip, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the divider resistor adjusting module is controlled, the corresponding divider resistor adjusting amplitude is set according to the actual light and heavy load voltage change value of the power supply chip, the light and heavy load voltage value of the output voltage is kept the same, and the output voltage precision is improved. Can effectively solve the following problems: the problem that the output voltage is increased after part of Buck voltage reduction circuits enter a light load mode is solved, and the output voltage is kept unchanged during light load and heavy load switching. The normal power supply of a part of chips or devices with higher requirements on voltage precision can be ensured.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a circuit connection block diagram of one embodiment of the present invention.
FIG. 2 is a schematic diagram of the circuit connections of one embodiment of the present invention.
FIG. 3 is a schematic flow chart diagram of a method of one embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The following explains key terms appearing in the present invention.
As shown in fig. 1 and fig. 2, the present invention provides a Buck circuit for dynamically adjusting an output voltage, which includes a power chip U1, a current detection module 101, an operational amplification module 102, a voltage dividing resistance adjustment module 103, and a feedback resistance module 104;
the power supply chip U1 is connected with the current detection module 101;
the current detection module 101 is connected with the operational amplification module 102;
the operational amplification module 102 is connected with the divider resistance adjustment module 103;
the feedback resistance module 104 is respectively connected with the power chip U1, the current detection module 101 and the divider resistance adjustment module 103;
the current detection module 101 is used for detecting the output current of the power supply chip;
the operational amplification module 102 is configured to receive the current detected by the current detection module 101, process the detected current, and output a control signal in real time; firstly, a current threshold value of the light/heavy load work of the circuit is calculated, the current detected by the current detection module 101 is processed, and when the current reaches the current threshold value, the potential change of the control signal is output.
And the voltage dividing resistance adjusting module 103 is used for controlling the on/off of the voltage dividing resistance adjusting module 103 according to the control signal output by the operational amplification module 102, so as to adjust the output voltage.
When the Buck circuit works, the current detection module 101 continuously detects output current, and when the current is lower than a set threshold value, the circuit enters a light load state, the control signal is pulled down, the control signal controls the voltage division resistance regulation module 103 to be closed, the output voltage is reduced, and the voltage reduction regulation is completed. When the current detected by the current detecting module 101 is not lower than the threshold, it indicates that the circuit enters the overload mode, the control signal is pulled high, the control signal controls the voltage dividing resistance adjusting module 103 to be turned on, after the voltage dividing resistance is adjusted, the output voltage is increased, and the boost adjusting process is completed.
It should be noted that the circuit further includes an output inductor L1;
a first end of the output inductor L1 is connected to the power chip U1, and a second end of the output inductor L1 is connected to the current detection module 101; the second end of the output inductor L1 is also grounded through the feedback resistance module 104, and the feedback resistance module 104 is connected to the power chip U1. The output inductor L1 is used to filter the output signal.
In some embodiments, the current detection module 101 includes a resistor R3, a first terminal of the resistor R3 is connected to a second terminal of the output inductor L1, and a second terminal of the resistor R3 is an output terminal Vout of the Buck circuit; the operational amplifier module 102 is connected to both ends of the resistor R3. The resistor R3 is a precision resistor for detecting the output current of the circuit.
In some embodiments, the operational amplifier module 102 includes an operational amplifier U2, a resistor R5, and a resistor R6;
the resistor R5 and the resistor R6 are connected in series and then connected in parallel at two ends of the resistor R3, a connection point of the resistor R5 and the resistor R6 is connected to a positive input end of the operational amplifier U2, a connection point of the resistor R6 and a second end of the resistor R3 is connected to a negative input end of the operational amplifier U2, and an output end of the operational amplifier U2 is connected to the divider resistor adjusting module 103. According to the current threshold value of the power chip U1 entering light/heavy load, the values of the resistor R5 and the resistor R6 are adjusted. When the detected current is larger than the light/heavy current threshold value of the power supply chip U1, the control signal output by the operational amplifier U2 is at a high level; when the detected current is less than or equal to the light/heavy load current threshold, the control signal changes to a low level. It should be noted that an amplifier of model LM358 is used. It should be noted that, when the current drops below the current threshold of light and heavy load, the circuit works from heavy load state to light load state, and the voltage of the output Vout will be slightly higher than the set voltage; when the current rises to exceed the light and heavy load threshold, the circuit works from the light load state to the heavy load state, and the voltage of the output Vout can be reduced to a normal voltage value.
In some embodiments, the voltage dividing resistance adjusting module 103 includes a resistor R4 and a MOS transistor Q1;
the output end of the operational amplifier U2 is connected to the gate of the MOS transistor Q1, and the drain of the MOS transistor Q1 is connected to the connection point of the feedback resistance module 104 and the power supply chip U1 through a resistor R4; the source of the MOS transistor Q1 is grounded.
In some embodiments, the feedback resistance module 104 includes a resistor R1 and a resistor R2 connected in series;
the resistor R1 is connected with the second end of the output inductor L1, and the connection point of the resistor R1 and the resistor R2 is connected with the feedback end FB of the power supply chip U1; the drain of the MOS transistor Q1 is connected to the connection point of the resistor R1 and the resistor R2 through the resistor R4.
When the Burk circuit enters light load operation, the control signal is at low level, and after the MOS transistor Q1 is closed, the voltage of Vout is determined by the resistor R1 and the resistor R2; when the Burk circuit enters the heavy load mode, the control signal becomes high level, the MOS transistor Q1 is turned on, and the voltage of Vout is determined by the resistor R2 and the resistor R4 which is connected in parallel. When the MOS transistor Q1 is turned on, the resistance to ground of Vfb is the total resistance value of R2 connected in parallel with the newly added resistor, and the resistance to ground of Vfb is defined as RAnd areIs formed by connecting R2 and R4 in parallel,
Rand are＝(R2+R4)/(R2*R4)
Vout＝Vfb*(R1+RAnd are)/RAnd are
When the MOS transistor Q1 is turned off, the resistance to ground of Vfb is also R2;
Vout＝Vfb*(R1+R2)/R2
in some embodiments, the input terminal VIN of the power chip U1 is connected to the power VIN;
the input end VIN of the power supply chip U1 is grounded through an input filter capacitor C1;
the output terminal Vout of the Buck circuit is connected to ground through an output filter capacitor C2. The grounding end of the power chip U1 is grounded, the enable end EN of the power chip U1 is connected with an external enable signal, and the power end of the power chip U1 is connected with an external power supply. The output terminal SW of the power chip U1 is connected to the BST terminal of the power chip U1 through a capacitor C3.
As shown in fig. 3, an embodiment of the present invention provides a method for dynamically adjusting an output voltage of a Buck circuit, which is applied to a Buck circuit for dynamically adjusting an output voltage, where the Buck circuit includes a power chip, a current detection module, an operational amplification module, a voltage-dividing resistance adjustment module, and a feedback resistance module; the power supply chip is connected with the current detection module; the current detection module is connected with the operational amplification module; the operational amplification module is connected with the divider resistance adjustment module; the feedback resistance module is respectively connected with the power chip, the current detection module and the divider resistance adjusting module; the method comprises the following steps:
s1: when the Buck circuit works, the current detection module continuously detects output current;
s2: inputting the detected current into an operational amplification module;
s3: the operational amplification module adjusts and outputs a control signal according to the current threshold value of the power supply chip in the light load state or the heavy load state;
s4: the on/off of the divider resistance adjusting module is controlled by the control signal output by the operational amplifying module, so that the adjustment of the output voltage is completed.
In some embodiments, in S3, the step of adjusting and outputting the control signal by the operational amplifier module according to the current threshold of the power chip entering the light load state or the heavy load state includes:
s31: judging whether the detected output current is smaller than a current threshold value; if yes, go to step S32; if not, go to step S33;
s32: when the circuit is indicated to enter a light load state, the operational amplification module outputs a control signal to be a low level by adjusting the resistance value of the resistor;
s33: the circuit is indicated to enter a heavy load mode, and the operational amplification module outputs a control signal to be a high level by adjusting the resistance value of the resistor.
In some embodiments, in step S4, the step of controlling the voltage dividing resistance adjusting module to turn off by the control signal output by the operational amplifying module, and the step of completing the adjustment of the output voltage includes:
when the divider resistance adjustment module receives that the operational amplification module outputs the control signal at the low level, that is, after step S32, the method executes the following steps:
s41: the low-level control signal controls the voltage-dividing resistance adjusting module to be closed, the output voltage is reduced, and the voltage-reducing adjustment of the output voltage is completed;
when the divider resistance adjustment module receives that the operational amplification module outputs the control signal at the high level, that is, after step S33, the method executes the following steps:
s42: the high-level control signal controls the voltage-dividing resistor adjusting module to be started, and after the voltage-dividing resistor is adjusted, the output voltage rises to finish the voltage-boosting adjustment of the output voltage.
The output current of the Buck circuit is detected, voltage adjustment is carried out according to whether the current exceeds a light and heavy load current threshold value of the power supply chip, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the divider resistor adjusting module is controlled, the corresponding divider resistor adjusting amplitude is set according to the actual light and heavy load voltage change value of the power supply chip, the light and heavy load voltage value of the output voltage is kept the same, and the output voltage precision is improved.
It should be noted that, the current detection module: selecting R3 (selecting resistance value according to current, generally selecting resistance of milliohm to reduce voltage loss) to be connected in series with the output path of Vout, and detecting the current of Vout; the operational amplification module: two resistors R5 and R6 and an operational amplifier LM358 are added to process the current detected by the resistor R3, and the values of the resistor R5 and the resistor R6 are adjusted according to the current threshold value when the power supply chip enters light and heavy loads. When the current is larger than the light and heavy load current threshold of the power supply chip, the control signal output by the operational amplifier LM358 is at a high level; when the output current is less than the light-load current threshold, the control signal changes to a low level. The divider resistance adjustment module: r4 and Q1 are added to be connected in series and then connected with R2 in parallel, when the circuit enters light load operation, the control signal is low level, and after Q1 is turned off, the voltage reference formula of Vout is as follows:
vout ═ Vfb (R1+ R2)/R2, determined by R1 and R2; when the circuit enters the heavy-load mode, the control signal becomes high level, Q1 is turned on, the resistance to ground of Vfb is defined as R _ and is formed by connecting R2 and R4 in parallel,
Rand are＝(R2+R4)/(R2*R4)
Vout＝Vfb*(R1+RAnd are)/RAnd are
After parallel connection, the resistance becomes small, so RAnd areSmaller than R2, Vout voltage rises.
An appropriate R4 resistance value needs to be calculated according to the variation value of the light and heavy load working voltage of the actual power chip, so as to ensure that the value of the output voltage Vout does not vary after the power is switched between light and heavy.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A Buck circuit for dynamically adjusting output voltage is characterized by comprising a power chip, a current detection module, an operational amplification module, a divider resistance adjustment module and a feedback resistance module;
the power supply chip is connected with the current detection module;
the current detection module is connected with the operational amplification module;
the operational amplification module is connected with the divider resistance adjustment module;
the feedback resistance module is respectively connected with the power chip, the current detection module and the divider resistance adjusting module;
the current detection module is used for detecting the output current of the power supply chip;
the operational amplification module is used for receiving the current detected by the current detection module, processing the detected current by the operational amplifier and outputting a control signal in real time;
and the divider resistance adjusting module is used for controlling the switch of the divider resistance adjusting module according to the control signal output by the operational amplification module so as to adjust the output voltage.
2. The Buck circuit for dynamically regulating an output voltage according to claim 1, further comprising an output inductor;
the first end of the output inductor is connected with the power supply chip, and the second end of the output inductor is connected with the current detection module; the second end of the output inductor is grounded through a feedback resistance module, and the feedback resistance module is connected with the power supply chip.
3. The Buck circuit for dynamically regulating output voltage according to claim 2, wherein the current detection module comprises a resistor R3, a first terminal of the resistor R3 is connected to a second terminal of the output inductor, and a second terminal of the resistor R3 is an output terminal of the Buck circuit; the operational amplification module is connected to two ends of the resistor R3.
4. The Buck circuit for dynamically regulating output voltage according to claim 3, wherein the operational amplification module comprises an operational amplifier, a resistor R5 and a resistor R6;
the resistor R5 and the resistor R6 are connected in series and then connected in parallel at two ends of the resistor R3, a connection point of the resistor R5 and the resistor R6 is connected to a positive input end of the operational amplifier, a connection point of the resistor R6 and a second end of the resistor R3 is connected to a negative input end of the operational amplifier, and an output end of the operational amplifier is connected to the divider resistor adjusting module.
5. The Buck circuit for dynamically regulating the output voltage according to claim 4, wherein the voltage dividing resistance regulating module comprises a resistor R4 and a MOS (metal oxide semiconductor) transistor;
the output end of the operational amplifier is connected to the grid electrode of the MOS tube, and the drain electrode of the MOS tube is connected to the connecting point of the feedback resistance module and the power supply chip through a resistor R4; the source electrode of the MOS tube is grounded.
6. The Buck circuit for dynamically regulating output voltage according to claim 5, wherein the feedback resistance module comprises a resistor R1 and a resistor R2 connected in series;
the resistor R1 is connected with the second end of the output inductor, and the connection point of the resistor R1 and the resistor R2 is connected to the power supply chip; the drain of the MOS transistor is connected to the connection point of the resistor R1 and the resistor R2 through the resistor R4.
7. The Buck circuit for dynamically regulating an output voltage according to claim 3, wherein the input terminal of the power supply chip is connected to a power supply;
the input end of the power supply chip is grounded through an input filter capacitor;
the output end of the Buck circuit is grounded through an output filter capacitor.
8. A method for dynamically adjusting an output voltage of a Buck circuit, which is applied to the Buck circuit for dynamically adjusting an output voltage according to claim 1, the method comprising the steps of:
when the Buck circuit works, the current detection module continuously detects output current;
inputting the detected current into an operational amplification module;
the operational amplification module adjusts and outputs a control signal according to the current threshold value of the power supply chip in the light load state or the heavy load state;
the on/off of the divider resistance adjusting module is controlled by the control signal output by the operational amplifying module, so that the adjustment of the output voltage is completed.
9. The method of claim 8, wherein the step of adjusting the operational amplifier module according to the current threshold of the power chip entering the light load state or the heavy load state and outputting the control signal comprises:
the operational amplification module compares the received detected output current with a current threshold;
when the detected output current is smaller than the current threshold, the circuit is indicated to enter a light load state, and the operational amplification module outputs a control signal to be a low level by adjusting the resistance value of the resistor;
when the detected output current is larger than or equal to the current threshold, the circuit is indicated to enter a heavy-load mode, and the operational amplification module outputs a control signal to be a high level by adjusting the resistance value of the resistor.
10. The method for dynamically adjusting the output voltage of the Buck circuit according to claim 9, wherein the step of controlling the voltage dividing resistance adjusting module to be turned off by the control signal output by the operational amplification module to complete the adjustment of the output voltage comprises:
when the divider resistance adjusting module receives that the control signal output by the operational amplification module is at a low level, the low level control signal controls the divider resistance adjusting module to be closed, the output voltage is reduced, and the voltage reduction adjustment of the output voltage is completed;
when the divider resistance adjusting module receives that the control signal output by the operational amplification module is at a high level, the high level control signal controls the divider resistance adjusting module to be started, and after the divider resistance is adjusted, the output voltage rises to complete the boost adjustment of the output voltage.
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| CN202010954377.6A CN112350575A (en) | 2020-09-11 | 2020-09-11 | Buck circuit for dynamically adjusting output voltage and dynamic adjusting method |
| PCT/CN2021/103396 WO2022052585A1 (en) | 2020-09-11 | 2021-06-30 | Buck circuit for dynamically adjusting output voltage, and dynamic adjustment method |
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| CN202010954377.6A CN112350575A (en) | 2020-09-11 | 2020-09-11 | Buck circuit for dynamically adjusting output voltage and dynamic adjusting method |
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| WO2022052585A1 (en) * | 2020-09-11 | 2022-03-17 | 苏州浪潮智能科技有限公司 | Buck circuit for dynamically adjusting output voltage, and dynamic adjustment method |
| CN116501125A (en) * | 2023-06-29 | 2023-07-28 | 荣耀终端有限公司 | Power supply voltage regulating circuit, method and electronic equipment |
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| CN116933720B (en) * | 2023-09-18 | 2023-12-12 | 成都电科星拓科技有限公司 | Method and circuit compatible with different voltage chip designs packaged in same way |
| CN117477953B (en) * | 2023-12-27 | 2024-03-12 | 吉林省龙电电气有限公司 | Power module with adjustable multipath voltage output |
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| WO2022052585A1 (en) | 2022-03-17 |
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Application publication date: 20210209 |