CN216351137U - Power signal acquisition circuit - Google Patents
Power signal acquisition circuit Download PDFInfo
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- CN216351137U CN216351137U CN202122078528.9U CN202122078528U CN216351137U CN 216351137 U CN216351137 U CN 216351137U CN 202122078528 U CN202122078528 U CN 202122078528U CN 216351137 U CN216351137 U CN 216351137U
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Abstract
The utility model provides a power signal acquisition circuit, comprising: the circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a first operational amplifier, a first voltage-frequency conversion chip, a first crystal oscillator and a microcontroller. The voltage division is carried out through the first voltage division resistor and the second voltage division resistor, the first operational amplifier, the first voltage frequency conversion chip and the microcontroller are sequentially connected, the output voltage signal of the power supply is determined through the microcontroller, the acquisition cost of the power supply signal can be reduced, and the accuracy of the determined output voltage signal of the power supply can be guaranteed.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a power supply signal acquisition circuit.
Background
Through the great development of electronic equipment, the power signal acquisition circuit is widely applied to various fields. In a traditional power signal acquisition circuit, an AD chip is generally directly adopted to acquire a voltage signal of a power supply, the scheme has high requirements on external components and devices and needs to be adjusted and calibrated, and high cost is paid if high acquisition precision is required.
Therefore, it is urgently needed to provide a power signal acquisition circuit.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power supply signal acquisition circuit which is used for overcoming the defects in the prior art.
The utility model provides a power signal acquisition circuit, comprising: the circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, a first operational amplifier, a first voltage frequency conversion chip, a first crystal oscillator and a microcontroller;
the resistance value of the first divider resistor is larger than that of the second divider resistor; a first end of the first voltage-dividing resistor is connected with a first pole of a power supply, a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; the input end of the first operational amplifier is connected with the second end of the first voltage-dividing resistor;
the input end of the first voltage frequency conversion chip is respectively connected with the output end of the first operational amplifier and the first crystal oscillator, and the output end of the first voltage frequency conversion chip is connected with the microcontroller;
the microcontroller is configured to determine an output voltage signal of the power supply based on the frequency signal output by the first voltage frequency conversion chip.
According to the power signal acquisition circuit provided by the utility model, the microcontroller stores the resistance value of the first divider resistor, the resistance value of the second divider resistor and the corresponding relation between the frequency signal and the voltage signal;
accordingly, the microcontroller is specifically configured to determine the output voltage signal based on the frequency signal output by the first voltage-to-frequency conversion chip, the correspondence, the resistance value of the first voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor.
According to the power signal acquisition circuit provided by the utility model, the power signal acquisition circuit further comprises: the sampling resistor, the instrument amplifier, the second operational amplifier, the second voltage frequency conversion chip and the second crystal oscillator;
the sampling resistor is connected with a second pole of the power supply in series, the input end of the instrument amplifier is connected with the sampling resistor in parallel, the output end of the instrument amplifier is connected with the input end of the second operational amplifier, the input end of the second voltage frequency conversion chip is respectively connected with the output end of the second operational amplifier and the second crystal oscillator, and the output end of the second voltage frequency conversion chip is connected with the microcontroller;
the microcontroller is further configured to determine an output current signal of the power supply based on the frequency signal output by the second voltage frequency conversion chip.
According to the power signal acquisition circuit provided by the utility model, the resistance value of the sampling resistor and the corresponding relation between the frequency signal and the voltage signal are stored in the microcontroller;
correspondingly, the microcontroller is specifically configured to determine the voltage signal of the sampling resistor based on the frequency signal output by the first voltage-frequency conversion chip and the corresponding relationship, and determine the output current signal based on the resistance value of the sampling resistor and the voltage signal of the sampling resistor.
According to the power signal acquisition circuit provided by the utility model, the resistance value of the sampling resistor is 0.1 omega.
According to the power signal acquisition circuit provided by the utility model, the crystal oscillator frequency of the second crystal oscillator is 1 MHz.
The power supply signal acquisition circuit further comprises a capacitor, and the capacitor is connected with the second voltage-dividing resistor in parallel.
According to the power signal acquisition circuit provided by the utility model, the resistance values of the first divider resistor and the second divider resistor are determined based on the rated output voltage of the power supply and the input signal range of the first operational amplifier.
According to the power supply signal acquisition circuit provided by the utility model, the rated output voltage of the power supply is 24V, the input signal range of the first operational amplifier is 0-3.3V, the resistance value of the first divider resistor is 20k omega, and the resistance value of the second divider resistor is 1k omega.
According to the power signal acquisition circuit provided by the utility model, the first electrode is a positive electrode.
The utility model provides a power signal acquisition circuit, comprising: the circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a first operational amplifier, a first voltage-frequency conversion chip, a first crystal oscillator and a microcontroller. The voltage division is carried out through the first voltage division resistor and the second voltage division resistor, the first operational amplifier, the first voltage frequency conversion chip and the microcontroller are sequentially connected, the output voltage signal of the power supply is determined through the microcontroller, the acquisition cost of the power supply signal can be reduced, and the accuracy of the determined output voltage signal of the power supply can be guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a power signal acquisition circuit according to the present invention;
fig. 2 is a second schematic structural diagram of the power signal acquisition circuit provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
Fig. 1 is a schematic structural diagram of a power signal acquisition circuit provided in an embodiment of the present invention, and as shown in fig. 1, a power signal acquisition circuit 00 includes: the circuit comprises a first voltage-dividing resistor 1, a second voltage-dividing resistor 2, a first operational amplifier 3, a first voltage-frequency conversion chip 4, a first crystal oscillator 5 and a microcontroller 6;
the resistance value of the first divider resistor 1 is larger than that of the second divider resistor 2; a first terminal of the first voltage-dividing resistor 1 is connected to a first pole of the power supply 7, a second terminal of the first voltage-dividing resistor 1 is connected to a first terminal of the second voltage-dividing resistor 2, and a second terminal of the second voltage-dividing resistor 2 is grounded.
The input end of the first operational amplifier 3 is connected with the second end of the first divider resistor 1; the input end of the first voltage frequency conversion chip 4 is respectively connected with the output end of the first operational amplifier 3 and the first crystal oscillator 5, and the output end of the first voltage frequency conversion chip 4 is connected with the microcontroller 6; the microcontroller 6 is configured to determine an output voltage signal of the power supply 7 based on the frequency signal output by the first voltage-to-frequency conversion chip 4.
Specifically, in the power signal acquisition circuit provided in the embodiment of the present invention, the acquired object is a power signal, and the power signal may at least include an output voltage signal of the power supply 7, where the output voltage signal refers to a voltage value actually output by the power supply 7. The power supply 7 may be a power supply board, and the power supply 7 may include a DC/DC converter 71 therein for converting a high DC voltage into a low DC voltage, for example, a voltage of 110V into a voltage of 24V. The power signal acquisition circuit 00 may be disposed in the power source 7, and a first pole of the power source 7 may be a positive pole of the output, and the first pole may be led out by the DC/DC converter 71.
The power signal acquisition circuit 00 may include a first voltage dividing resistor 1, a second voltage dividing resistor 2, a first operational amplifier 3, a first voltage-to-frequency conversion chip 4, a first crystal oscillator 5, and a microcontroller 6. Wherein, the resistance value of the first divider resistor 1 is larger than that of the second divider resistor 2; a first terminal of the first voltage-dividing resistor 1 is connected to a first pole of the power supply 7, a second terminal of the first voltage-dividing resistor 1 is connected to a first terminal of the second voltage-dividing resistor 2, and a second terminal of the second voltage-dividing resistor 2 is grounded. The input end of the first operational amplifier 3 is connected to the second end of the first voltage-dividing resistor 1, and the voltage signal input to the first operational amplifier 3 is the voltage signal at both ends of the second voltage-dividing resistor 2.
The first operational amplifier 3 may be a non-inverting proportional amplifier, i.e. a voltage follower, and the amplification factor of the first operational amplifier is 1, so that the driving capability of the power signal acquisition circuit 00 can be improved. In the embodiment of the present invention, the second terminal of the first voltage-dividing resistor 1 may be specifically connected to the non-inverting input terminal of the first operational amplifier 3. The negative phase input of the first operational amplifier 3 is connected to the output of the first operational amplifier. The voltage signal output by the first operational amplifier 3 is in phase and equal in magnitude to the input voltage signal.
The first voltage-to-frequency conversion chip 4 may be an 8-pin chip, and the output terminal of the first operational amplifier 3 may be connected to the input terminal of the first voltage-to-frequency conversion chip 4. The input terminal of the first voltage-to-frequency conversion chip 4 may include a 5 th pin and an 8 th pin, and may be connected to the output terminal of the first operational amplifier 3 through the 8 th pin, so that the voltage signal output by the first operational amplifier 3 is input to the first voltage-to-frequency conversion chip 4. The 5 th pin is connected to the first crystal oscillator 5, and the first crystal oscillator 5 can provide a clock signal for the voltage frequency conversion function of the first voltage frequency conversion chip 4. The first voltage frequency conversion chip 4 may convert the input voltage signal into a corresponding frequency signal. For each pin of the first voltage-to-frequency conversion chip 4, there is a corresponding relationship between the voltage signal and the frequency signal. The output end of the first voltage-frequency conversion chip 4 is connected to the Microcontroller 6, the output end of the first voltage-frequency conversion chip 4 may include a3 rd pin, and the frequency signal obtained by conversion may be output to the Microcontroller (MCU) 6 through the 3 rd pin.
The microcontroller 6 may be configured to determine an output voltage signal of the power supply 7 based on the frequency signal output by the first voltage to frequency conversion chip 4. The microcontroller 6 may store the resistance value of the first voltage-dividing resistor 1, the resistance value of the second voltage-dividing resistor 2, and the corresponding relationship between the frequency signal and the voltage signal, and the microcontroller 6 may determine the output voltage signal of the power supply 7 according to the frequency signal output by the first voltage-frequency conversion chip 4, the corresponding relationship, the resistance value of the first voltage-dividing resistor 1, and the resistance value of the second voltage-dividing resistor 2. The microcontroller 6 may be an Arduino microcontroller, such as an AVR ATmega328P microcontroller, or other types of microcontrollers, such as SCH3112, SCH3114 and SCH3116, which are not limited in the embodiments of the present invention.
The power signal acquisition circuit provided in the embodiment of the utility model comprises: the circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a first operational amplifier, a first voltage-frequency conversion chip, a first crystal oscillator and a microcontroller. The voltage division is carried out through the first voltage division resistor and the second voltage division resistor, the first operational amplifier, the first voltage frequency conversion chip and the microcontroller are sequentially connected, the output voltage signal of the power supply is determined through the microcontroller, the acquisition cost of the power supply signal can be reduced, and the accuracy of the determined output voltage signal of the power supply can be guaranteed.
On the basis of the above embodiment, in the power signal acquisition circuit provided in the embodiment of the present invention, the microcontroller stores the resistance value of the first voltage-dividing resistor, the resistance value of the second voltage-dividing resistor, and the corresponding relationship between the frequency signal and the voltage signal;
accordingly, the microcontroller is specifically configured to determine the output voltage signal based on the frequency signal output by the first voltage-to-frequency conversion chip, the correspondence, the resistance value of the first voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor.
Specifically, in the embodiment of the present invention, the microcontroller may determine the voltage signals at two ends of the second voltage-dividing resistor according to the input frequency signal and by combining the correspondence, and then determine the output voltage signal of the power supply according to a ratio of the resistance value of the second voltage-dividing resistor to the sum of the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor.
In the embodiment of the utility model, the microcontroller determines the output voltage signal of the power supply by combining the self-stored information and the received frequency signal output by the first voltage frequency conversion chip, the principle is simple, and the result is reliable.
As shown in fig. 2, on the basis of the foregoing embodiment, the power signal acquisition circuit provided in the embodiment of the present invention further includes: the sampling resistor 8, the instrument amplifier 9, the second operational amplifier 10, the second voltage frequency conversion chip 11 and the second crystal oscillator 12;
the sampling resistor 8 is connected with the second pole of the power supply 7 in series, the input end of the instrument amplifier 9 is connected with the sampling resistor 8 in parallel, the output end of the instrument amplifier 9 is connected with the input end of the second operational amplifier 10, the input end of the second voltage frequency conversion chip 11 is respectively connected with the output end of the second operational amplifier 10 and the second crystal oscillator 12, and the output end of the second voltage frequency conversion chip 11 is connected with the microcontroller 7;
the microcontroller 7 is further configured to determine an output current signal of the power supply 7 based on the frequency signal output by the second voltage-to-frequency conversion chip 11.
Specifically, in the embodiment of the present invention, the power signal may further include an output current signal of the power supply 7, where the output current signal refers to a current value actually output by the power supply 7.
The power signal acquisition circuit 00 includes a sampling resistor 8, an instrumentation amplifier 9, a second operational amplifier 10, a second voltage-frequency conversion chip 11, and a second crystal oscillator 12, in addition to a first voltage-dividing resistor 1, a second voltage-dividing resistor 2, a first operational amplifier 3, a first voltage-frequency conversion chip 4, a first crystal oscillator 5, and a microcontroller 6. The sampling resistor 8 is connected in series with the second pole of the power supply 7, and the second pole of the power supply 7 may be the negative pole of the output or may be drawn out by the DC/DC converter 71.
The input end of the instrumentation amplifier 9 is connected in parallel with the sampling resistor 8, and the output end of the instrumentation amplifier 9 is connected with the input end of the second operational amplifier 10. The instrumentation amplifier 9 is configured to amplify the voltage signal at both ends of the sampling resistor 8, and send the amplified voltage signal to the second operational amplifier 10. The instrumentation amplifier 9 may be an 8-pin chip, the input terminals of the instrumentation amplifier 9 may be a 7 th pin and an 8 th pin, and the 7 th pin and the 8 th pin may be respectively connected to the sampling resistor 8. The output of the instrumentation amplifier 9 may be pin 2, with pin 2 connected to the input of the second operational amplifier 10. The second operational amplifier 10 may be a non-inverting proportional amplifier, i.e. a voltage follower, and the amplification factor of the second operational amplifier is 1, which may improve the driving capability of the power signal acquisition circuit 00. In an embodiment of the present invention, the output terminal of the instrumentation amplifier 9 may be connected to the non-inverting input terminal of the second operational amplifier 10. The negative input of the second operational amplifier 10 is connected to the output of the first operational amplifier. The voltage signal output by the second operational amplifier 10 is in phase and equal in magnitude to the input voltage signal.
The second voltage-to-frequency conversion chip 11 may be an 8-pin chip, and an output terminal of the second operational amplifier 10 may be connected to an input terminal of the second voltage-to-frequency conversion chip 11. The input terminal of the second voltage-to-frequency conversion chip 11 may include a 5 th pin and an 8 th pin, and may be connected to the output terminal of the second operational amplifier 10 through the 8 th pin, so that the voltage signal output by the second operational amplifier 10 is input to the second voltage-to-frequency conversion chip 11. The second crystal oscillator 12 may provide a clock signal for the voltage-frequency conversion function of the second voltage-frequency conversion chip 11 by connecting the 5 th pin with the second crystal oscillator 12. The second voltage frequency conversion chip 11 may convert the input voltage signal into a corresponding frequency signal. For each pin of the second voltage-to-frequency conversion chip 11, there is a corresponding relationship between the voltage signal and the frequency signal. The output end of the second voltage frequency conversion chip 11 is connected to the microcontroller 6, the output end of the second voltage frequency conversion chip 11 may include a3 rd pin, and the frequency signal obtained by conversion may be output to the microcontroller 6 through the 3 rd pin.
In an embodiment of the present invention, the microcontroller 6 may be configured to determine the output current signal of the power supply 7 based on the frequency signal output by the second voltage-to-frequency conversion chip 11. In the microcontroller 6, the resistance value of the sampling resistor 8 and the corresponding relationship between the frequency signal and the voltage signal may be stored, and the microcontroller 6 may determine the output current signal of the power supply 7 according to the frequency signal output by the second voltage-frequency conversion chip 11, the corresponding relationship, and the resistance value of the sampling resistor 8.
The power signal acquisition circuit provided in the embodiment of the present invention further includes: the sampling resistor, the instrument amplifier, the second operational amplifier, the second voltage frequency conversion chip and the second crystal oscillator. Sampling is carried out through the sampling resistor, the sampling resistor is sequentially connected with the microcontroller through the instrument amplifier, the second operational amplifier and the second voltage frequency conversion chip, and the output current signal of the power supply is determined through the microcontroller, so that the acquisition cost of the power supply signal can be reduced, and the accuracy of the determined output current signal of the power supply can be ensured.
On the basis of the above embodiment, in the power signal acquisition circuit provided in the embodiment of the present invention, the resistance value of the sampling resistor and the corresponding relationship between the frequency signal and the voltage signal are stored in the microcontroller;
correspondingly, the microcontroller is specifically configured to determine the voltage signal of the sampling resistor based on the frequency signal output by the first voltage-frequency conversion chip and the corresponding relationship, and determine the output current signal based on the resistance value of the sampling resistor and the voltage signal of the sampling resistor.
Specifically, in the embodiment of the present invention, the microcontroller may determine the voltage signals amplified by the instrumentation amplifier at the two ends of the sampling resistor according to the input frequency signals and by combining the correspondence, reduce the obtained voltage signals by the same factor according to the amplification factor of the instrumentation amplifier stored in the microcontroller, and determine the output current signal of the power supply by combining the resistance value of the sampling resistor.
In the embodiment of the utility model, the microcontroller determines the output current signal of the power supply by combining the self-stored information and the received frequency signal output by the second voltage frequency conversion chip, the principle is simple, and the result is reliable.
On the basis of the above embodiment, in the power signal acquisition circuit provided in the embodiment of the present invention, the resistance value of the sampling resistor may be 0.1 Ω.
On the basis of the above embodiments, in the power signal acquisition circuit provided in the embodiments of the present invention, the crystal oscillator frequencies of the first crystal oscillator and the second crystal oscillator may be both 1 MHz.
As shown in fig. 2, on the basis of the above embodiment, the power signal acquisition circuit provided in the embodiment of the present invention further includes a capacitor 13, and the capacitor 13 is connected in parallel with the second voltage-dividing resistor 2. By means of the capacitor 13, a filtering effect can be achieved.
On the basis of the foregoing embodiment, in the power signal acquisition circuit provided in the embodiment of the present invention, the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor are both determined based on the rated output voltage of the power supply and the input signal range of the first operational amplifier. The input signal range of the first operational amplifier is related to the model, and is not particularly limited in the embodiment of the present invention.
On the basis of the above embodiment, in the power signal acquisition circuit provided in the embodiment of the present invention, the rated output voltage of the power supply is 24V, the input signal range of the first operational amplifier is 0-3.3V, the resistance value of the first voltage-dividing resistor is 20k Ω, and the resistance value of the second voltage-dividing resistor is 1k Ω.
In summary, an embodiment of the present invention provides a power signal acquisition circuit, which may include: a voltage acquisition part and a current acquisition part.
The voltage acquisition part divides a voltage signal output by the power supply by the first voltage dividing resistor and the second voltage dividing resistor, so that the voltage signals at two ends of the second voltage dividing resistor conform to the input signal range of the first operational amplifier, and the first operational amplifier amplifies the voltage signals at two ends of the second voltage dividing resistor in an in-phase proportion to improve the driving capability of the power supply signal acquisition circuit. And then the voltage signal is sent to a first voltage frequency conversion chip, the voltage signal is converted into a frequency signal, and the frequency signal is further collected and calculated by the MCU and finally converted into an output voltage signal of the power supply.
The current acquisition part firstly converts the current into a weak voltage signal by a high-precision current sampling resistor. Then, the weak voltage signal is amplified by the instrument amplifier and amplified to a position between the input signal range of the first operational amplifier. The amplified voltage signal is amplified in the same phase proportion by the second operational amplifier so as to improve the driving capability. And the voltage signal passing through the second operational amplifier is sent to a second voltage frequency conversion chip, the voltage signal is converted into a frequency signal, the frequency signal is collected by the MCU, and the frequency signal is finally converted into an output current signal of the power supply through calculation.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and 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.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A power signal acquisition circuit, comprising: the circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, a first operational amplifier, a first voltage frequency conversion chip, a first crystal oscillator and a microcontroller;
the resistance value of the first divider resistor is larger than that of the second divider resistor; a first end of the first voltage-dividing resistor is connected with a first pole of a power supply, a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; the input end of the first operational amplifier is connected with the second end of the first voltage-dividing resistor;
the input end of the first voltage frequency conversion chip is respectively connected with the output end of the first operational amplifier and the first crystal oscillator, and the output end of the first voltage frequency conversion chip is connected with the microcontroller;
the microcontroller is configured to determine an output voltage signal of the power supply based on the frequency signal output by the first voltage frequency conversion chip.
2. The power signal acquisition circuit according to claim 1, wherein the microcontroller stores therein a resistance value of the first voltage-dividing resistor, a resistance value of the second voltage-dividing resistor, and a correspondence between a frequency signal and a voltage signal;
accordingly, the microcontroller is specifically configured to determine the output voltage signal based on the frequency signal output by the first voltage-to-frequency conversion chip, the correspondence, the resistance value of the first voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor.
3. The power signal acquisition circuit of claim 1, further comprising: the sampling resistor, the instrument amplifier, the second operational amplifier, the second voltage frequency conversion chip and the second crystal oscillator;
the sampling resistor is connected with a second pole of the power supply in series, the input end of the instrument amplifier is connected with the sampling resistor in parallel, the output end of the instrument amplifier is connected with the input end of the second operational amplifier, the input end of the second voltage frequency conversion chip is respectively connected with the output end of the second operational amplifier and the second crystal oscillator, and the output end of the second voltage frequency conversion chip is connected with the microcontroller;
the microcontroller is further configured to determine an output current signal of the power supply based on the frequency signal output by the second voltage frequency conversion chip.
4. The power signal acquisition circuit according to claim 3, wherein the microcontroller stores the resistance value of the sampling resistor and the corresponding relationship between the frequency signal and the voltage signal;
correspondingly, the microcontroller is specifically configured to determine the voltage signal of the sampling resistor based on the frequency signal output by the first voltage-frequency conversion chip and the corresponding relationship, and determine the output current signal based on the resistance value of the sampling resistor and the voltage signal of the sampling resistor.
5. The power signal acquisition circuit of claim 3, wherein the sampling resistor has a resistance of 0.1 Ω.
6. The power signal acquisition circuit of claim 3, wherein the crystal oscillator frequency of the second crystal oscillator is 1 MHz.
7. The power supply signal acquisition circuit according to any one of claims 1-6, further comprising a capacitor connected in parallel with the second voltage-dividing resistor.
8. The power signal acquisition circuit according to any one of claims 1 to 6, wherein the resistance value of the first voltage-dividing resistor and the resistance value of the second voltage-dividing resistor are determined based on a rated output voltage of the power supply and an input signal range of the first operational amplifier.
9. The power signal acquisition circuit according to claim 8, wherein the rated output voltage of the power supply is 24V, the input signal range of the first operational amplifier is 0-3.3V, the resistance of the first voltage-dividing resistor is 20k Ω, and the resistance of the second voltage-dividing resistor is 1k Ω.
10. A power supply signal acquisition circuit as claimed in any one of claims 1 to 6 wherein the first electrode is positive.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115113089A (en) * | 2022-06-30 | 2022-09-27 | 苏州浪潮智能科技有限公司 | Electric quantity monitoring device, power supply and server |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115113089A (en) * | 2022-06-30 | 2022-09-27 | 苏州浪潮智能科技有限公司 | Electric quantity monitoring device, power supply and server |
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