CN110647200A - Voltage regulating circuit and voltage regulating method thereof - Google Patents
Voltage regulating circuit and voltage regulating method thereof Download PDFInfo
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- CN110647200A CN110647200A CN201910954203.7A CN201910954203A CN110647200A CN 110647200 A CN110647200 A CN 110647200A CN 201910954203 A CN201910954203 A CN 201910954203A CN 110647200 A CN110647200 A CN 110647200A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The invention discloses a voltage regulating circuit and a circuit regulating method thereof, wherein the voltage regulating circuit comprises: the device comprises a voltage comparison module and a voltage adjustment module. The output end of the voltage comparison module is connected with the input end of the voltage adjustment module, the input end of the voltage comparison module is connected with the output end of the power supply module, the output voltage of the power supply module is received, the output voltage is compared with a preset reference voltage, a driving signal is generated according to a comparison result and is output to the voltage adjustment module, the output end of the voltage adjustment module is connected with the driving end of the power supply module and is used for presetting the output voltage adjustment value of the power supply module within an overvoltage protection range according to the driving signal, and the power supply module outputs the adjusted output voltage. Based on the invention, the output voltage of the power supply module can be adjusted to be within the preset overvoltage protection range, so that the input voltage of the rear-end device is within the range of the highest bearable input voltage of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is further solved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a voltage regulating circuit and a voltage regulating method thereof.
Background
At present, each group of power supplies on a system is subjected to an overvoltage protection (OVP) test, so that the output voltage of each group of power supplies on the system is ensured within the range of the bearable highest input voltage of a rear-end device, and overvoltage failure of the rear-end device is further avoided, wherein the rear-end device comprises hardware devices such as a Central Processing Unit (CPU), a digital direct current to direct current load controller and the like, and the power supplies on the system for the rear-end device.
In the prior art, when the output voltage of the power supply on the system exceeds the maximum input voltage range that can be tolerated by the backend device, the conventional voltage regulation method can adjust the output voltage of the power supply on the system to be within the maximum input voltage range that can be tolerated by the backend device through software via the power management bus PMBUS. However, the output voltage of the system power supply can only be adjusted to the range of the highest acceptable input voltage of the CPU and the digital dc-to-dc load controller by this method, and the output voltage of the system power supply cannot be adjusted to the set value in the range of the highest acceptable input voltage of other hardware devices, which results in the failure of other hardware devices except the CPU and the digital dc-to-dc load controller due to overvoltage.
Disclosure of Invention
In view of this, embodiments of the present invention provide a voltage regulating circuit and a voltage regulating method thereof to solve the problem in the prior art that hardware devices other than a CPU and a digital dc-to-dc load controller fail due to overvoltage.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a first aspect of the present invention discloses a voltage regulating circuit, including: the voltage comparison module and the voltage adjustment module;
the output end of the voltage comparison module is connected with the input end of the voltage adjustment module, the input end of the voltage comparison module is connected with the output end of the power supply module, the output voltage of the power supply module is received, a preset reference voltage is compared with the output voltage, a driving signal is generated according to a comparison result, and the driving signal is output to the voltage adjustment module;
the output end of the voltage adjusting module is connected with the drive end of the power supply module and used for adjusting the output voltage of the power supply module to a preset overvoltage protection range according to the drive signal, so that the power supply module outputs the adjusted output voltage.
Optionally, the voltage comparison module includes: the device comprises a comparator and a preset reference voltage module;
the preset reference voltage module is used for generating a preset reference voltage and outputting the preset reference voltage to the inverting input end of the comparator;
the positive phase input end of the comparator is connected with the output end of the power supply module, receives the output voltage of the power supply module, compares the output voltage of the power supply module with the preset reference voltage, and generates a driving signal according to a comparison result, wherein the driving signal comprises a high-level driving signal and a low-level driving signal.
Optionally, the preset reference voltage module includes: a first reference voltage divider resistor and a second reference voltage divider resistor;
one end of the first reference voltage divider resistor is connected with a power supply, and the other end of the first reference voltage divider resistor is connected with one end of the second reference voltage divider resistor;
the other end of the second reference voltage divider resistor is grounded;
the connection end of the first reference voltage divider resistor and the second reference voltage divider resistor is connected with the inverting input end of the comparator, and is used for generating a preset reference voltage and outputting the preset reference voltage to the inverting input end of the comparator.
Optionally, the voltage adjusting module includes: the driving module and the third voltage divider resistor;
the first end of the driving module is the input end of the voltage adjusting module and is connected with the output end of the voltage comparing module, the second end of the driving module is grounded, and the third end of the driving module is connected with one end of the third voltage divider resistor;
the other end of the third voltage divider resistor is an output end of the voltage adjusting module and is connected with a driving end of the power supply module;
the driving module is used for adjusting the resistance value of the third voltage divider resistor according to a driving signal so as to change the voltage of the third voltage divider resistor.
Optionally, the driving module includes: a field effect transistor;
the grid electrode of the field effect tube is connected with the output end of the voltage comparison module, the source electrode of the field effect tube is grounded, and the drain electrode of the field effect tube is connected with one end of the third voltage divider resistor.
Optionally, the power module includes: the load POL converter, a fourth voltage divider resistor and a fifth voltage divider resistor;
the first end of the load POL converter is connected with the power supply through the input end of the power supply module, the second end of the load POL converter is connected with one end of the fourth voltage dividing resistor, and the third end of the load POL converter is connected with the other end of the fourth voltage dividing resistor;
the connection end of the fourth voltage dividing resistor and the load POL converter is connected with one end of the fifth voltage dividing resistor, and the other end of the fifth voltage dividing resistor is grounded;
the connection end of the fourth voltage divider resistor and the second end of the load POL converter is the output end of the power module, and the output end of the power module is connected with the input end of the voltage comparison module;
the third end of the load POL converter is a driving end of the power supply module, and the driving end of the power supply module is connected with an output end of the voltage regulation module and is used for receiving the output voltage of the power supply module regulated by the voltage regulation module to a preset overvoltage protection range according to the driving signal and outputting the regulated output voltage.
Optionally, the power module further includes: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the first end of the load POL converter, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the first end of the load POL converter, and the other end of the second capacitor is grounded.
The second aspect of the present invention discloses a voltage regulating method of a voltage regulating circuit, which is applied to the voltage regulating circuit disclosed in the first aspect, and the voltage regulating circuit includes: the voltage regulation method comprises the following steps:
the voltage comparison module compares the received output voltage of the power supply module with a preset reference voltage, generates a driving signal according to a comparison result, and outputs the driving signal to the voltage adjustment module;
the voltage adjusting module adjusts the output voltage of the power supply module to a preset overvoltage protection range according to the driving signal, so that the power supply module outputs the adjusted output voltage.
Based on the voltage regulation circuit and the voltage regulation method thereof provided by the embodiment of the invention, the voltage regulation circuit comprises: the device comprises a voltage comparison module and a voltage adjustment module. The output end of the voltage comparison module is connected with the input end of the voltage adjustment module, the input end of the voltage comparison module is connected with the output end of the power supply module, the output voltage of the power supply module is received, the output voltage is compared with a preset reference voltage, a driving signal is generated according to the comparison result, the driving signal is output to the voltage adjustment module, the output end of the voltage adjustment module is connected with the driving end of the power supply module, and the voltage adjustment module is used for presetting the output voltage adjustment value of the power supply module within an overvoltage protection range according to the driving signal, so that the power supply module outputs the adjusted output voltage. The voltage regulating circuit disclosed by the invention can send the driving information generated by the voltage comparing module to the voltage regulating module, so that the voltage regulating module regulates the output voltage of the power supply module to be within a preset overvoltage protection range according to the driving information, the input voltage of the rear-end device is within the range of the highest bearable input voltage of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is further solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage regulating circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a voltage regulator circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of another voltage regulation circuit according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a voltage regulation method of a voltage regulation circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As can be seen from the above background, the conventional voltage regulation method can only regulate the output voltage of the power supply on the system to the range of the highest sustainable input voltage conforming to the CPU and the digital dc-to-dc load controller, but cannot regulate the output voltage of the power supply on the system to the range of the highest sustainable input voltage conforming to other hardware devices, thereby causing the failure of other hardware devices except the CPU and the digital dc-to-dc load controller due to overvoltage. In view of this disadvantage, the prior art designs a protection range of the overvoltage protection OVP in the load converter POL to adjust the output voltage of the power supply on the system to be within the highest acceptable input voltage range of other hardware devices except the CPU and the digital dc-to-dc load controller, but the protection range of the overvoltage protection OVP set by this method is fixed, and when the protection range of the overvoltage protection OVP is set to be larger than that of some rear-end devices, the rear-end devices fail due to overvoltage because the protection range of the overvoltage protection OVP cannot be adjusted.
Therefore, the invention discloses a voltage regulating circuit and a voltage regulating method thereof, which utilize a voltage comparison module and a voltage regulation module to regulate the output voltage of a power supply module to be within a preset overvoltage protection range, so that the input voltage of a rear-end device is within the range of the bearable highest input voltage of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is further solved.
As shown in fig. 1, an embodiment of the invention discloses a structural schematic diagram of a voltage regulating circuit.
The voltage regulating circuit includes: the voltage comparison module 101 and the voltage adjustment module 102 are used for adjusting the output voltage of the power supply module to a preset overvoltage protection range through the voltage comparison module 101 and the voltage adjustment module 102, and the connection relationship between the voltage comparison module 101 and the voltage adjustment module 102 and the power supply module and the functions of the voltage comparison module 101 and the voltage adjustment module 102 are described as follows:
the voltage comparison module 101 is connected to the power supply module and the voltage adjustment module 102, respectively. The voltage comparison module 101 is configured to receive an output voltage of the power supply module, compare the output voltage of the power supply module with a preset reference voltage, generate a driving signal according to a comparison result, and send the driving signal to the voltage adjustment module 102.
Specifically, the input end of the voltage comparison module 101 is connected to the output end of the power supply module, and is configured to receive the output voltage generated by the power supply module.
The input end of the voltage comparison module 101 is connected to the output end of the power supply module, and the output end of the voltage comparison module 101 is connected to the input end of the voltage adjustment module 102, and is configured to compare the received output voltage of the power supply module with a preset reference voltage, generate a driving signal according to a comparison result, and send the driving signal to the voltage adjustment module 102.
In the embodiment of the present application, the driving signal includes a high level driving signal and a low level driving signal. As a preferred mode of the embodiment of the present application, the process of generating the driving signal by the voltage comparison module 101 is as follows:
the received output voltage of the power module is compared with a preset reference voltage, and if the output voltage of the power module is greater than the preset reference voltage, a high-level driving signal is generated and sent to the voltage adjusting module 102. On the contrary, if the output voltage of the power module is not greater than the preset reference voltage, low-level driving information is generated, and the low-level driving signal is sent to the voltage adjusting module 102.
The voltage adjusting module 102 is connected to the voltage comparing module 101 and the power supply module, and is configured to adjust the output voltage of the power supply module to a preset overvoltage protection range according to the driving signal, so that the power supply module outputs the adjusted output voltage.
Specifically, an input end of the voltage adjustment module 102 is connected to an output end of the voltage comparison module 101, and an output end of the voltage adjustment module 102 is connected to a driving end of the power module, and is configured to adjust the output voltage of the power module to a preset overvoltage protection range according to the driving signal sent by the voltage comparison module 102, so that the power module outputs the adjusted output voltage.
In the embodiment of the application, the signal that the driving voltage adjustment module 102 adjusts the output voltage of the power module to be within the preset overvoltage protection range is the high-level driving signal, that is, the voltage adjustment module 102 adjusts the output voltage of the power module to be within the preset overvoltage protection range when receiving the high-level driving signal, and if receiving the low-level driving signal, the adjustment of the output voltage of the power module may be prohibited. Regarding the specific setting manner of the driving voltage adjustment module 102 adjusting the output voltage of the power module to the signal within the predetermined over-voltage protection range, the inventor can set the signal according to his own requirement, which is not limited in the embodiment of the present application.
In the embodiment of the present application, the predetermined magnitude of the overvoltage protection range is related to the magnitude of the predetermined reference voltage, and the predetermined overvoltage protection range may be a range of values or a value. For example, when the predetermined overvoltage protection range is a numerical range, the overvoltage protection range may be set to 80% to 90% of the predetermined reference voltage; when the predetermined protection range is a value, the over-voltage protection range may be set to 80% of the predetermined reference voltage. When the voltage regulating circuit needs to regulate the output voltage to different overvoltage protection ranges, the preset reference voltage can be set according to the overvoltage protection ranges, so that requirements of the different overvoltage protection ranges are met, specific contents related to the overvoltage protection ranges can be set according to practical application, and the embodiment of the application is not limited.
The embodiment of the invention discloses a voltage regulating circuit, which comprises: the voltage comparison module and the voltage adjustment module. The output end of the voltage comparison module is connected with the input end of the voltage adjustment module, the input end of the voltage comparison module is connected with the output end of the power supply module, the output voltage of the power supply module is received, the output voltage is compared with a preset reference voltage, a driving signal is generated according to a comparison result and is output to the voltage adjustment module, the output end of the voltage adjustment module is connected with the driving end of the power supply module and is used for presetting the output voltage adjustment value of the power supply module within an overvoltage protection range according to the driving signal, and the power supply module outputs the adjusted output voltage. The voltage regulating circuit disclosed by the invention can send the driving signal generated by the voltage comparing module to the voltage regulating module, so that the voltage regulating module regulates the output voltage of the power supply module to be within a preset overvoltage protection range according to the driving information, the input voltage of the rear-end device is within the range of the highest bearable input voltage of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is further solved.
Further, as shown in fig. 2, a circuit diagram of the voltage regulating circuit according to the embodiment of the present invention is provided to illustrate an optional structure of the power supply module, the voltage comparing module 101, and the voltage adjusting module 102.
The power module includes: the load POL converter, the fourth voltage divider resistance R4 and the fifth voltage divider resistance R5, the first capacitor C1 and the second capacitor C2.
The first end of the load POL converter is the input end of the Power module and is connected with the Power Supply Power _ Supply _12V, the second end of the load POL converter is connected with one end of the fourth voltage dividing resistor R4, and the third end of the load POL converter is connected with the other end of the fourth voltage dividing resistor R4.
The connection end of the fourth voltage dividing resistor R4 and the load POL converter is connected to one end of the fifth voltage dividing resistor R5, and the other end of the fifth voltage dividing resistor R5 is grounded.
The fourth voltage dividing resistor R4 and the fifth voltage dividing resistor R5 may have the same or different resistances. The specific values of the resistances of the fourth voltage divider resistor R4 and the fifth voltage divider resistor R5 may be set according to the needs of the inventor, and the embodiment of the present invention is not limited thereto.
The connection end between the fourth voltage divider resistor R4 and the second end of the load POL converter is the output end of the power module, and the output end of the power module is connected to the input end of the voltage comparison module 101.
The third end of the load POL converter is a driving end of the power module, and the driving end of the power module is connected to the output end of the voltage regulation module 102, and is configured to receive the driving signal, regulate the output voltage of the power module to a preset overvoltage protection range by the voltage regulation module 102, and output the regulated output voltage.
One terminal of the first capacitor C1 is connected to the first terminal of the load POL converter, and the other terminal of the first capacitor C1 is grounded.
One end of the second capacitor C2 is connected to the first end of the load POL converter, and the other end of the second capacitor C2 is grounded.
It should be noted that the first capacitor C1 and the second capacitor C2 are both nonpolar capacitors.
The voltage comparison module 101 includes: a comparator B and a preset reference voltage module.
One end of the preset reference voltage module is connected with the Power _ Supply _12V, the other end of the preset reference voltage module is connected with the inverting input end of the comparator B, and the other end of the preset reference voltage module is grounded. The preset reference voltage module is used for generating a preset reference voltage and outputting the generated preset reference voltage to the inverting input end of the comparator B.
In an embodiment of the present application, the default reference voltage generated by the default reference voltage module is smaller than a highest voltage value in a sustainable highest input voltage range of a middle back-end device with a lowest sustainable highest input voltage range of the back-end devices. For example, the bearable maximum input voltage range of the back-end device 1 is 6.5V to 7V, the bearable maximum input voltage range of the back-end device 2 is 5V to 6V, and the preset reference voltage can be set to 5.7V by the preset reference voltage module. The specific value related to the predetermined reference voltage can be set according to practical applications, and the embodiment of the present disclosure is not limited thereto.
The positive input end of the comparator B is connected with the output end of the power supply module as the input end of the voltage comparison module 101, the output end of the comparator B is connected with the input end of the voltage adjustment module 102 as the output end of the voltage comparison module 101, and the comparator B is used for receiving the output voltage of the power supply module, comparing the output voltage of the power supply module with a preset reference voltage, generating a high-level driving signal if the output voltage of the power supply module is greater than the preset reference voltage, and outputting the high-level driving signal to the voltage adjustment module 102; if the output voltage of the power module is not greater than the preset reference voltage, low level driving information is generated, and a low level driving signal is output to the voltage adjustment module 102.
A voltage regulation module 102, comprising: a drive module and a third voltage dividing resistor R3.
The first end of the driving module is an input end of the voltage adjusting module 102 and is connected to the output end of the voltage comparing module 101, the second end of the driving module is grounded, and the third end of the driving module is connected to one end of the third voltage dividing resistor R3.
The other end of the third voltage divider resistor R3 is an output end of the voltage adjustment module and is connected to a driving end of the power module.
The driving module is used for adjusting the resistance value of the third voltage divider resistor R3 according to the driving signal so as to change the voltage of the third voltage divider resistor, and further adjust the output voltage of the power module to a preset overvoltage protection range, so that the power module outputs the adjusted output voltage.
In the embodiment, the driving voltage adjusting module 102 adjusts the output voltage of the power module to be a high level driving signal when the signal within the predetermined over-voltage protection range is obtained. Specifically, the driving module changes the voltage of the third voltage divider resistor according to the resistance of the high-level driving signal third voltage divider resistor R3, and then adjusts the output voltage of the power module to a preset overvoltage protection range, so that the power module outputs the adjusted output voltage.
The third voltage division voltage R3 is a sliding varistor.
In an embodiment of the present application, the voltage regulation circuit may include a power supply module.
According to the voltage regulating circuit provided by the embodiment of the invention, the output voltage of the power supply module can be compared with the preset reference voltage through the voltage comparison module, and under the condition that the output voltage of the power supply module is greater than the preset reference voltage, a high-level driving signal is generated and output to the voltage regulating module, so that the voltage regulating module regulates the output voltage of the power supply module to be within the preset overvoltage protection range according to the high-level driving signal, the input voltage of the rear-end device is within the bearable highest input voltage range of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is solved.
Further, as shown in fig. 3, another circuit diagram of the voltage regulating circuit according to the embodiment of the present invention is provided to illustrate another optional structure of the power supply module, the voltage comparing module 101, and the voltage adjusting module 102.
The power module includes: the load POL converter, the fourth voltage divider resistance R4 and the fifth voltage divider resistance R5, the first capacitor C1 and the second capacitor C2.
The first end of the load POL converter is the input end of the Power module and is connected with the Power Supply Power _ Supply _12V, the second end of the load POL converter is connected with one end of the fourth voltage dividing resistor R4, and the third end of the load POL converter is connected with the other end of the fourth voltage dividing resistor R4.
The connection end of the fourth voltage dividing resistor R4 and the load POL converter is connected to one end of the fifth voltage dividing resistor R5, and the other end of the fifth voltage dividing resistor R5 is grounded.
The connection end between the fourth voltage divider resistor R4 and the second end of the load POL converter is the output end of the power module, and the output end of the power module is connected to the input end of the voltage comparison module 101.
The third end of the load POL converter is a driving end of the power module, and the driving end of the power module is connected to the output end of the voltage regulation module 102, and is configured to receive the driving signal, regulate the output voltage of the power module to a preset overvoltage protection range by the voltage regulation module 102, and output the regulated output voltage.
One terminal of the first capacitor C1 is connected to the first terminal of the load POL converter, and the other terminal of the first capacitor C1 is grounded.
One end of the second capacitor C2 is connected to the first end of the load POL converter, and the other end of the second capacitor C2 is grounded.
The voltage comparison module 101 includes: a comparator B and a preset reference voltage module.
Wherein, predetermine the reference voltage module and include: a first reference voltage divider resistor R1 and a second reference voltage divider resistor R2
One end of the first reference voltage dividing resistor R1 is connected to the Power Supply Power _ Supply _12V, and the other end of the first reference voltage dividing resistor R1 is connected to one end of the second reference voltage dividing resistor R2.
The other end of the second reference voltage divider resistor R2 is grounded;
the connection end of the first reference voltage dividing resistor R1 and the second reference voltage dividing resistor R2 is connected to the inverting input end of the comparator B, and is used for generating a preset reference voltage and outputting the preset reference voltage to the inverting input end of the comparator B.
The positive input end of the comparator B is connected with the output end of the power supply module as the input end of the voltage comparison module 101, the output end of the comparator B is connected with the input end of the voltage adjustment module 102 as the output end of the voltage comparison module 101, and the comparator B is used for receiving the output voltage of the power supply module, comparing the output voltage of the power supply module with a preset reference voltage, generating a high-level driving signal if the output voltage of the power supply module is greater than the preset reference voltage, and outputting the high-level driving signal to the voltage adjustment module 102; if the output voltage of the power module is not greater than the preset reference voltage, low level driving information is generated, and a low level driving signal is output to the voltage adjustment module 102.
A voltage regulation module 102, comprising: a drive module and a third voltage dividing resistor R3.
The driving module comprises a field effect transistor Q.
Specifically, the gate of the field effect transistor Q is connected to the output terminal of the voltage comparison module 101 as the input terminal of the voltage adjustment module 102, the source of the field effect transistor Q is grounded, and the drain of the field effect transistor Q is connected to one end of the third voltage dividing resistor R3.
The field effect transistor is an N-channel field effect transistor.
According to the voltage regulating circuit provided by the embodiment of the invention, the output voltage of the power supply module can be compared with the preset reference voltage through the voltage comparison module, and under the condition that the output voltage of the power supply module is greater than the preset reference voltage, a high-level driving signal is generated and output to the voltage regulating module, so that the voltage regulating module regulates the output voltage of the power supply module to be within the preset overvoltage protection range according to the high-level driving signal, the input voltage of the rear-end device is within the bearable highest input voltage range of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is solved.
Based on the voltage regulating circuit disclosed in the embodiment of the present invention, the embodiment of the present invention also discloses a voltage regulating method of the voltage regulating circuit correspondingly, as shown in fig. 4, which is a schematic flow chart of the voltage regulating method of the voltage regulating circuit provided in the embodiment of the present invention, and the voltage regulating circuit includes: the voltage adjusting method comprises the following steps:
s401: the voltage comparison module compares the received output voltage of the power supply module with a preset reference voltage, generates a driving signal according to a comparison result, and outputs the driving signal to the voltage adjustment module.
S402: the voltage adjusting module adjusts the output voltage of the power supply module to a preset overvoltage protection range according to the driving signal, so that the power supply module outputs the adjusted output voltage.
The specific principle and the implementation process of each module and unit in the voltage regulating circuit disclosed in the embodiment of the present invention are the same as those of the voltage regulating method disclosed in the embodiment of the present invention, and reference may be made to corresponding parts in the voltage regulating circuit disclosed in the embodiment of the present invention, and details are not repeated here.
The embodiment of the invention discloses a voltage regulating method of a voltage regulating circuit, which comprises the steps of comparing the received output voltage of a power supply module with a preset reference voltage through a voltage comparison module, generating a driving signal according to the comparison result, outputting the driving signal to a voltage regulating module, regulating the output voltage of the power supply module to be within a preset overvoltage protection range by the voltage regulating module according to the driving signal, and enabling the power supply module to output the regulated output voltage. According to the technical scheme provided by the invention, the driving information generated by the voltage comparison module can be sent to the voltage adjustment module, so that the voltage adjustment module adjusts the output voltage of the power supply module to be within a preset overvoltage protection range according to the driving information, the input voltage of the rear-end device is within the range of the highest bearable input voltage of the rear-end device, and the problem of failure of the rear-end device due to overvoltage is further solved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (8)
1. A voltage regulation circuit, characterized in that the voltage regulation circuit comprises: the voltage comparison module and the voltage adjustment module;
the output end of the voltage comparison module is connected with the input end of the voltage adjustment module, the input end of the voltage comparison module is connected with the output end of the power supply module, the output voltage of the power supply module is received, a preset reference voltage is compared with the output voltage, a driving signal is generated according to a comparison result, and the driving signal is output to the voltage adjustment module;
the output end of the voltage adjusting module is connected with the drive end of the power supply module and used for adjusting the output voltage of the power supply module to a preset overvoltage protection range according to the drive signal, so that the power supply module outputs the adjusted output voltage.
2. The voltage regulation circuit of claim 1, wherein the voltage comparison module comprises: the device comprises a comparator and a preset reference voltage module;
the preset reference voltage module is used for generating a preset reference voltage and outputting the preset reference voltage to the inverting input end of the comparator;
the positive phase input end of the comparator is connected with the output end of the power supply module, receives the output voltage of the power supply module, compares the output voltage of the power supply module with the preset reference voltage, and generates a driving signal according to a comparison result, wherein the driving signal comprises a high-level driving signal and a low-level driving signal.
3. The voltage regulation circuit of claim 2, wherein the pre-set reference voltage module comprises: a first reference voltage divider resistor and a second reference voltage divider resistor;
one end of the first reference voltage divider resistor is connected with a power supply, and the other end of the first reference voltage divider resistor is connected with one end of the second reference voltage divider resistor;
the other end of the second reference voltage divider resistor is grounded;
the connection end of the first reference voltage divider resistor and the second reference voltage divider resistor is connected with the inverting input end of the comparator, and is used for generating a preset reference voltage and outputting the preset reference voltage to the inverting input end of the comparator.
4. The voltage regulation circuit of claim 1, wherein the voltage adjustment module comprises: the driving module and the third voltage divider resistor;
the first end of the driving module is the input end of the voltage adjusting module and is connected with the output end of the voltage comparing module, the second end of the driving module is grounded, and the third end of the driving module is connected with one end of the third voltage divider resistor;
the other end of the third voltage divider resistor is an output end of the voltage adjusting module and is connected with a driving end of the power supply module;
the driving module is used for adjusting the resistance value of the third voltage divider resistor according to a driving signal so as to change the voltage of the third voltage divider resistor.
5. The voltage regulation circuit of claim 1, wherein the driver module comprises: a field effect transistor;
the grid electrode of the field effect tube is connected with the output end of the voltage comparison module, the source electrode of the field effect tube is grounded, and the drain electrode of the field effect tube is connected with one end of the third voltage divider resistor.
6. The voltage regulation circuit of claim 1, wherein the power module comprises: the load POL converter, a fourth voltage divider resistor and a fifth voltage divider resistor;
the first end of the load POL converter is connected with the power supply through the input end of the power supply module, the second end of the load POL converter is connected with one end of the fourth voltage dividing resistor, and the third end of the load POL converter is connected with the other end of the fourth voltage dividing resistor;
the connection end of the fourth voltage dividing resistor and the load POL converter is connected with one end of the fifth voltage dividing resistor, and the other end of the fifth voltage dividing resistor is grounded;
the connection end of the fourth voltage divider resistor and the second end of the load POL converter is the output end of the power module, and the output end of the power module is connected with the input end of the voltage comparison module;
the third end of the load POL converter is a driving end of the power supply module, and the driving end of the power supply module is connected with an output end of the voltage regulation module and is used for receiving the output voltage of the power supply module regulated by the voltage regulation module to a preset overvoltage protection range according to the driving signal and outputting the regulated output voltage.
7. The voltage regulation circuit of claim 6, wherein the power module further comprises: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the first end of the load POL converter, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the first end of the load POL converter, and the other end of the second capacitor is grounded.
8. A voltage regulation method of a voltage regulation circuit, adapted to the voltage regulation circuit of any one of claims 1-7, the voltage regulation circuit comprising: the voltage regulation method comprises the following steps:
the voltage comparison module compares the received output voltage of the power supply module with a preset reference voltage, generates a driving signal according to a comparison result, and outputs the driving signal to the voltage adjustment module;
the voltage adjusting module adjusts the output voltage of the power supply module to a preset overvoltage protection range according to the driving signal, so that the power supply module outputs the adjusted output voltage.
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