CN111413561A - Power supply ripple simulation system with state monitoring function - Google Patents
Power supply ripple simulation system with state monitoring function Download PDFInfo
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Abstract
Power supply ripple analog system with state monitoring function relates to ripple voltage and generates the field. The problem of among the prior art ripple voltage simulation's in-process can't simulate the randomness of ripple, the fixed amplitude of the ripple voltage of output and the unable real-time supervision of the ripple voltage state of output is solved. The upper computer control unit is used for sending instructions for controlling the waveform, amplitude and frequency of the ripple waves to the ripple wave simulation and power supply state monitoring unit and displaying the voltage value and the current value of the ripple wave direct current output by the ripple wave simulation and power supply state monitoring unit; the direct current power supply unit is used for providing a direct current power supply for the ripple wave simulation and power supply state monitoring unit; the ripple simulation and power supply state monitoring unit is used for generating direct current with ripples according to the received control instruction and the direct current power supply signal, collecting voltage values and current values of the direct current with ripples, and uploading the voltage values and the current values to the upper computer control unit. Providing a direct current with ripple.
Description
Technical Field
The present invention relates to the field of ripple voltage generation.
Background
In the design reliability verification process of a modern electronic system, the ripple index of a power supply is an important test index, and the anti-interference capability of the electronic system to power supply ripple generally needs to be tested. There is a need for a power supply with interfering signal components that can provide a dc voltage with ripple, the amplitude of the dc voltage can be varied as desired, the superimposed analog ripple needs to meet the power spectrum distribution characteristics of the actual ripple, and the amplitude and frequency can be varied as desired to achieve a certain accuracy under load conditions.
In the prior art, the simulation of the ripple waves generally adopts special conditions such as sine waves, triangular waves, rectangular waves and the like, and the randomness of real ripple waves cannot be simulated; in addition, the amplitude of the power supply ripple is related to the input resistance of the load, so that the prior art cannot monitor the actual ripple amplitude in a load state and cannot accurately evaluate the anti-interference capability of the electronic system design on the power supply ripple; meanwhile, the voltage output by the prior art can only output several fixed voltage values due to the limitation of the device per se, and can not meet different voltage requirements of an electronic system to be evaluated, so that the problems need to be solved urgently.
Disclosure of Invention
The invention provides a power supply ripple simulation system with a state monitoring function, and aims to solve the problems that in the prior art, the randomness of ripple cannot be simulated in a ripple voltage simulation process, the amplitude of output ripple voltage is fixed, and the state of the output ripple voltage cannot be monitored in real time.
The power supply ripple simulation system with the state monitoring function comprises an upper computer control unit, a direct-current power supply unit and a ripple simulation and power supply state monitoring unit;
the upper computer control unit is used for sending instructions for controlling the waveform, amplitude and frequency of the ripple waves to the ripple wave simulation and power supply state monitoring unit and displaying the voltage value and the current value of the direct current with the ripple waves output by the ripple wave simulation and power supply state monitoring unit;
the direct current power supply unit is used for providing a direct current power supply signal for the ripple simulation and power supply state monitoring unit;
the ripple simulation and power supply state monitoring unit is used for generating direct current with ripples according to the received control instruction and the direct current power supply signal, and is also used for carrying out analog-to-digital conversion on the acquired voltage signal and current signal of the direct current with ripples to obtain the voltage value and current value of the direct current with ripples, and uploading the voltage value and the current value to the upper computer control unit;
the direct current with ripples is sine wave ripples, triangular wave ripples, rectangular wave ripples or Gaussian white noise ripples.
Preferably, the ripple simulation and power supply state monitoring unit comprises a main control module, a ripple generation module, a ripple superposition module and a power supply state monitoring module;
the main control module is used for generating a ripple digital quantity control signal according to a received command for controlling the waveform, amplitude and frequency of the ripple wave sent by the upper computer control unit and controlling the ripple wave generating module to generate the ripple wave;
the ripple generating module is used for sending the generated ripple to the ripple superposition module;
the ripple superposition module is used for superposing the received ripple to a direct current power supply signal so as to output direct current with the ripple;
and the power supply state monitoring module is used for acquiring a voltage signal and a current signal of the direct current with the ripple to perform analog-to-digital conversion, obtaining a voltage value and a current value of the direct current with the ripple, and uploading the voltage value and the current value to the upper computer control unit through the main control module.
Preferably, the ripple generation module may generate a sine wave ripple, a triangular wave ripple or a rectangular wave ripple by using a table lookup method.
Preferably, the ripple generation module generates a gaussian white noise ripple by using a Box-Muller algorithm.
Preferably, the ripple generation module includes 1 address generation module, 4 single-port ROM modules, 1 amplitude-frequency control module, 1D/a conversion control module, 2L FSR sequence generator modules, and 2 square root and multiplication operation modules;
the specific process of generating sine wave ripples, triangular wave ripples or rectangular wave ripples by the ripple generation module is as follows:
firstly, generating a sine wave table, a triangular wave table or a rectangular wave table through MAT L AB software, and storing the generated corresponding sine wave table, triangular wave table or rectangular wave table in a first single-port ROM module;
secondly, the address generation module outputs sequentially increasing addresses to read a corresponding sine wave table, a triangular wave table or a rectangular wave table in the first single-port ROM module, so that corresponding sine waves, triangular waves or rectangular waves are generated;
finally, the amplitude-frequency control module carries out amplitude and frequency transformation on the generated corresponding sine waves, triangular waves or rectangular waves according to a control instruction output by the main control module, and then converts the frequency-converted and amplitude-changed corresponding sine waves, triangular waves or rectangular waves into analog quantity through the D/A conversion control module and outputs the analog quantity to the ripple superposition module, so that sine wave ripples, triangular wave ripples or rectangular wave ripples are generated;
the specific process of generating the Gaussian white noise ripple by the ripple generation module comprises the following steps:
firstly, generating a logarithm table, a sine table and a cosine table through MAT L AB software, and respectively storing the logarithm table, the sine table and the cosine table into second to fourth single-port ROM modules;
secondly, a L FSR sequence generator module generates a first random address, and the first random address is used for reading the logarithm data in the logarithm table in a second single-port ROM module
And logarithmic data to be read
The first random address is sent to the first square root and multiplication operation module, meanwhile, the first random address also reads cosine data cos (2 pi U1) in the fourth single-port ROM module, and the read cosine data cos (2 pi U1) is sent to the second square root and multiplication operation module; u1 and U2 are both random variables;
generating a second random address by another L FSR sequence generator module, and reading the logarithm data in the logarithm table in the second single-port ROM module by using the second random address
And logarithmic data to be read
Sending the sine data sin (2 pi U2) to a second square root and multiplication operation module, simultaneously reading the sine data sin (2 pi U2) in a third single-port ROM module by using a second random address, and sending the read sine data sin (2 pi U2) to a first square root and multiplication operation module;
thirdly, the first square root and multiplication operation module reads the logarithm data
After square root operation is carried out, multiplication is carried out on the square root operation and the read sine data sin (2 pi U2) to obtain a variable Y, and the variable Y is sent to an amplitude-frequency control module, wherein,
at the same time, the second square root and multiplication operation module will read the logarithm data
After square root operation is carried out, the square root operation is multiplied by the read cosine data cos (2 pi U1) to obtain a variable X, and the variable X is sent to an amplitude-frequency control module, wherein,
the variable X and the variable Y obey Gaussian distribution with the mean value of 0 and the variance of 1;
finally, the amplitude-frequency control module carries out amplitude and frequency transformation on the generated variable X and variable Y meeting Gaussian distribution according to the control instruction output by the main control module to obtain a Gaussian white noise waveform with controllable amplitude and frequency, and then the Gaussian white noise waveform is converted into analog quantity through the D/A conversion control module and output to the ripple superposition module, so that the generation of the Gaussian white noise ripple is completed.
The power supply ripple simulation device has the advantages that any ripples such as sine wave ripples, triangular wave ripples, rectangular wave ripples and Gaussian white noise ripples can be simulated, the waveform is the power supply ripple of the Gaussian white noise, the simulated ripples have randomness, the ripples of the power supply in actual production can be simulated more truly, and the evaluation of the anti-interference capability of an electronic system to be evaluated on the power supply ripples is more accurate.
The direct-current power supply unit is an independent unit, any device capable of outputting the direct-current power supply can be selected, the system is not limited by the system, and the voltage with any voltage value can be output according to the design requirement of an electronic system to be evaluated.
The ripple simulation and power supply state monitoring unit monitors the voltage value and the current value of the direct current with ripples output by the system under the load state, realizes real-time monitoring of the direct current with ripples output by the system, and adjusts the amplitude of the ripples according to actual requirements, so that the evaluation of the anti-interference capability of the electronic system to be evaluated on the power supply ripples is more accurate.
Drawings
FIG. 1 is a schematic diagram of a power supply ripple simulation system with a status monitoring function;
fig. 2 is a schematic diagram of a ripple simulation and power supply state monitoring unit;
fig. 3 is a schematic diagram of a ripple generation module.
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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the power supply ripple simulation system with a state monitoring function according to the present embodiment includes an upper computer control unit 1, a dc power supply unit 2, and a ripple simulation and power supply state monitoring unit 3;
the upper computer control unit 1 is used for sending instructions for controlling the waveform, amplitude and frequency of the ripple to the ripple simulation and power supply state monitoring unit 3 and displaying the voltage value and the current value of the direct current with the ripple output by the ripple simulation and power supply state monitoring unit 3;
the direct current power supply unit 2 is used for providing a direct current power supply signal for the ripple simulation and power supply state monitoring unit 3;
the ripple simulation and power supply state monitoring unit 3 is used for generating direct current with ripples according to the received control instruction and the direct current power supply signal, and is also used for performing analog-to-digital conversion on the acquired voltage signal and current signal of the direct current with ripples to obtain the voltage value and current value of the direct current with ripples, and uploading the voltage value and current value to the upper computer control unit 1;
the direct current with ripples is sine wave ripples, triangular wave ripples, rectangular wave ripples or Gaussian white noise ripples.
The upper computer control unit 1 can control the waveform, amplitude and frequency of the ripple waves, can display the actual voltage value of the platform power supply, realizes monitoring of the output ripple wave voltage, and can adjust the amplitude of the ripple waves according to the actually measured voltage ripple wave value, so that the ripple wave simulation effect is more accurate, and the upper computer control unit 1 can be a PC (personal computer) as an upper computer and is designed with friendly man-machine interaction software according to the randomness of the corresponding control simulation ripple waves.
The upper computer control unit 1 is an independent unit, can be any device capable of providing a direct current power supply and is used for providing an actual power supply required by a load, the power supply capacity of the system is not limited by the system, the type of the direct current power supply can be selected according to the actual requirement of an electronic system to be evaluated on the power supply voltage, and the voltage meeting the actual requirement is output.
Further, referring to fig. 2 specifically, the ripple simulation and power supply state monitoring unit 3 includes a main control module 3-1, a ripple generating module 3-2, a ripple superimposing module 3-3, and a power supply state monitoring module 3-4;
the main control module 3-1 is used for generating a ripple digital quantity control signal according to a received command for controlling the waveform, amplitude and frequency of the ripple wave sent by the upper computer control unit 1, and controlling the ripple wave generating module 3-2 to generate the ripple wave;
the ripple generating module 3-2 is used for sending the generated ripple to the ripple superposing module 3-3;
the ripple superposition module 3-3 is used for superposing the received ripple to a direct current power supply signal so as to output direct current with the ripple;
and the power supply state monitoring module 3-4 is used for acquiring a voltage signal and a current signal of the direct current with the ripple to perform analog-to-digital conversion, obtaining a voltage value and a current value of the direct current with the ripple, and uploading the voltage value and the current value to the upper computer control unit 1 through the main control module 3-1.
The ripple generating module 3-2 can be realized by adopting an AD5542A-1 chip, the chip is a digital-to-analog conversion chip and can output analog signals of-5V- +5V, the resolution is 16 bits, the precision is 5mV, and the chip converts the ripple digital signals output by the main control chip into corresponding ripples.
The ripple superposition module 3-3 can be realized by an ADA4898-2YRDZ chip which is an arithmetic development device chip and can convert the single-ended ripple signal output by the ripple generation module into a differential signal, and the differential signal is superposed with a direct current power supply output by the direct current power supply unit 2 to output direct current voltage with ripples. In order to prevent the ripple generating module from being burnt out by the sink current generated by the dc voltage output by the dc power supply unit 2 in the superimposed circuit, a capacitor may be designed in the ripple superimposed module 3-3 to block the sink current of the dc power supply.
The power supply state monitoring module 3-4 can select an AD7606B chip which is an analog-to-digital conversion chip, the sampling voltage range is-10V- +10V, the highest sampling rate is 800Ksps, and the AC voltage with the frequency of below 400Khz can be sampled according to the sampling theorem. The power supply state monitoring module 3-4 can collect the voltage output by the system under the load condition, convert the voltage into a digital signal and send the digital signal to the main control module 3-1, so that the system can monitor the actual voltage of the platform power supply under the load condition.
Furthermore, the ripple generation module 3-2 may generate the sine wave ripple, the triangular wave ripple or the rectangular wave ripple by using a table lookup method.
Furthermore, the ripple generation module 3-2 generates a gaussian white noise ripple by using a Box-Muller algorithm. The basic idea of the Box-Muller algorithm is to obtain random numbers which obey uniform distribution, and then convert the random numbers which obey uniform distribution into random numbers which obey Gaussian distribution. The specific description is as follows: two random variables U1, U2 and X, Y which obey uniform distribution on [0,1] are selected to satisfy the formulas (1) and (2), so that X and Y obey Gaussian distribution with the mean value of 0 and the variance of 1.
Further, referring specifically to fig. 3, the ripple generation module 3-2 includes 1 address generation module 3-2-1, 4 single-port ROM modules 3-2-2, 1 amplitude-frequency control module 3-2-3, 1D/a conversion control module 3-2-4, 2L FSR sequencer modules 3-2-5, and 2 square root and multiplication operation modules 3-2-6;
the specific process of generating sine wave ripple, triangular wave ripple or rectangular wave ripple by the ripple generation module 3-2 is as follows:
firstly, generating a sine wave table, a triangular wave table or a rectangular wave table through MAT L AB software, and storing the generated corresponding sine wave table, triangular wave table or rectangular wave table in a first single-port ROM module 3-2-2;
secondly, the address generating module 3-2-1 outputs sequentially increasing addresses to read a corresponding sine wave table, triangular wave table or rectangular wave table in the first single-port ROM module 3-2-2, so as to generate a corresponding sine wave form, triangular wave form or rectangular wave form;
finally, the amplitude-frequency control module 3-2-3 performs amplitude and frequency conversion on the generated corresponding sine waves, triangular waves or rectangular waves according to the control instruction output by the main control module 3-1, and then converts the frequency-converted and amplitude-converted corresponding sine waves, triangular waves or rectangular waves into analog quantity through the D/A conversion control module 3-2-4 and outputs the analog quantity to the ripple superposition module 3-3, so as to complete the generation of sine wave ripples, triangular wave ripples or rectangular wave ripples;
the specific process of generating the gaussian white noise ripple by the ripple generation module 3-2 is as follows:
firstly, generating a logarithm table, a sine table and a cosine table through MAT L AB software, and respectively storing the logarithm table, the sine table and the cosine table into second to fourth single-port ROM modules 3-2-2;
next, a L FSR sequencer module 3-2-5 generates a first random address, and reads the log data in the log table in the second single-port ROM module 3-2-2 using the first random address
And logarithmic data to be read
Sending to the first square root and multiplication operation module 3-2-6, and simultaneously reading cosine data in the fourth single-port ROM module 3-2-2 by the first random addresscos (2 π U1), and sends the read cosine data cos (2 π U1) to the second square root and multiply module 3-2-6; u1 and U2 are both random variables;
generating a second random address by another L FSR sequencer module 3-2-5, reading the log data in the log table in the second one-port ROM module 3-2-2 using the second random address
And logarithmic data to be read
The sine data sin (2 pi U2) in the third single-port ROM module 3-2-2 is read by the second random address and is sent to the second square root and multiplication operation module 3-2-6, and the read sine data sin (2 pi U2) is sent to the first square root and multiplication operation module 3-2-6;
again, the first square root and multiply operation module 3-2-6 will read the logarithm data
After square root operation is carried out, multiplication is carried out on the square root operation and the read sine data sin (2 pi U2) to obtain a variable Y, and the variable Y is sent to an amplitude-frequency control module 3-2-3, wherein,
at the same time, the second square root and multiplication operation module 3-2-6 will read the logarithm data
After square root operation is performed, the square root operation is multiplied by the read cosine data cos (2 pi U1) to obtain a variable X, and the variable X is sent to an amplitude-frequency control module 3-2-3, wherein,
the variable X and the variable Y obey Gaussian distribution with the mean value of 0 and the variance of 1;
finally, the amplitude-frequency control module 3-2-3 performs amplitude and frequency transformation on the generated variable X and variable Y meeting Gaussian distribution according to the control instruction output by the main control module 3-1 to obtain a Gaussian white noise waveform with controllable amplitude and frequency, and then converts the Gaussian white noise waveform into analog quantity through the D/A conversion control module 3-2-4 and outputs the analog quantity to the ripple superposition module 3-3, thereby completing the generation of the Gaussian white noise ripple.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (5)
1. The power supply ripple simulation system with the state monitoring function is characterized by comprising an upper computer control unit (1), a direct-current power supply unit (2) and a ripple simulation and power supply state monitoring unit (3);
the upper computer control unit (1) is used for sending instructions for controlling the waveform, amplitude and frequency of the ripple waves to the ripple wave simulation and power supply state monitoring unit (3) and is also used for displaying the voltage value and the current value of the direct current with the ripple waves output by the ripple wave simulation and power supply state monitoring unit (3);
the direct-current power supply unit (2) is used for providing a direct-current power supply signal for the ripple simulation and power supply state monitoring unit (3);
the ripple simulation and power supply state monitoring unit (3) is used for generating direct current with ripples according to the received control instruction and the direct current power supply signal, and is also used for carrying out analog-to-digital conversion on the acquired voltage signal and current signal of the direct current with ripples to obtain the voltage value and the current value of the direct current with ripples, and uploading the voltage value and the current value to the upper computer control unit (1);
the direct current with ripples is sine wave ripples, triangular wave ripples, rectangular wave ripples or Gaussian white noise ripples.
2. The power supply ripple simulation system with status monitoring function according to claim 1, wherein the ripple simulation and power supply status monitoring unit (3) comprises a main control module (3-1), a ripple generation module (3-2), a ripple superposition module (3-3) and a power supply status monitoring module (3-4);
the main control module (3-1) is used for generating a ripple digital quantity control signal according to a received command for controlling the waveform, amplitude and frequency of the ripple sent by the upper computer control unit (1) and controlling the ripple generating module (3-2) to generate the ripple;
the ripple generating module (3-2) is used for sending the generated ripple to the ripple superposing module (3-3);
a ripple superposition module (3-3) for superposing the received ripple to the DC power signal to output the DC power with the ripple;
and the power supply state monitoring module (3-4) is used for acquiring a voltage signal and a current signal of the direct current with the ripple to perform analog-to-digital conversion, acquiring a voltage value and a current value of the direct current with the ripple, and uploading the voltage value and the current value to the upper computer control unit (1) through the main control module (3-1).
3. The power supply ripple simulation system with condition monitoring function according to claim 2, wherein the ripple generation module (3-2) can generate sine wave ripple, triangular wave ripple or rectangular wave ripple by using a table lookup method.
4. The power supply ripple simulation system with condition monitoring function according to claim 2, wherein the ripple generation module (3-2) generates a gaussian white noise ripple by using a Box-Muller algorithm.
5. The power supply ripple simulation system with the status monitoring function according to claim 2, wherein the ripple generation module (3-2) comprises 1 address generation module (3-2-1), 4 single-port ROM modules (3-2-2), 1 amplitude-frequency control module (3-2-3), 1D/a conversion control module (3-2-4), 2L FSR sequencer modules (3-2-5), and 2 square root and multiplication operation modules (3-2-6);
the specific process of generating sine wave ripple, triangular wave ripple or rectangular wave ripple by the ripple generation module (3-2) is as follows:
firstly, generating a sine wave table, a triangular wave table or a rectangular wave table through MAT L AB software, and storing the corresponding generated sine wave table, triangular wave table or rectangular wave table in a first single-port ROM module (3-2-2);
secondly, the address generating module (3-2-1) outputs sequentially increasing addresses to read a corresponding sine wave table, triangular wave table or rectangular wave table in the first single-port ROM module (3-2-2), so as to generate a corresponding sine wave, triangular wave or rectangular wave;
finally, the amplitude-frequency control module (3-2-3) carries out amplitude and frequency conversion on the generated corresponding sine waves, triangular waves or rectangular waves according to a control instruction output by the main control module (3-1), and then converts the corresponding sine waves, triangular waves or rectangular waves after frequency conversion and amplitude variation into analog quantity through the D/A conversion control module (3-2-4) and outputs the analog quantity to the ripple superposition module (3-3), so that the sine wave ripples, the triangular wave ripples or the rectangular wave ripples are generated;
the specific process of generating the Gaussian white noise ripple by the ripple generation module (3-2) is as follows:
firstly, generating a logarithm table, a sine table and a cosine table through MAT L AB software, and respectively storing the logarithm table, the sine table and the cosine table into second to fourth single-port ROM modules (3-2-2);
secondly, a L FSR sequence generator module (3-2-5) generates a first random address, and the first random address is used for reading the logarithm data in the logarithm table in a second single-port ROM module (3-2-2)
And will beRead logarithmic data
The square root data is sent to a first square root and multiplication operation module (3-2-6), meanwhile, the first random address also reads cosine data cos (2 pi U1) in a fourth single-port ROM module (3-2-2), and the read cosine data cos (2 pi U1) is sent to a second square root and multiplication operation module (3-2-6); u1 and U2 are both random variables;
generating a second random address by another L FSR sequence generator module (3-2-5), and reading the logarithm data in the logarithm table of the second single-port ROM module (3-2-2) by using the second random address
And logarithmic data to be read
Sending the sine data sin (2 pi U2) to a second square root and multiplication operation module (3-2-6), reading the sine data sin (2 pi U2) in a third single-port ROM module (3-2-2) by using the second random address, and sending the read sine data sin (2 pi U2) to the first square root and multiplication operation module (3-2-6);
thirdly, the first square root and multiplication operation module (3-2-6) reads the logarithm data
After square root operation is carried out, multiplication is carried out on the square root operation and the read sine data sin (2 pi U2) to obtain a variable Y, and the variable Y is sent to an amplitude-frequency control module (3-2-3), wherein,
at the same time, the second square root and multiplication operation module (3-2-6) will read the logarithm data
First squareAfter root operation, multiplying the root operation by the read cosine data cos (2 pi U1) to obtain a variable X, and sending the variable X to an amplitude-frequency control module (3-2-3), wherein,
the variable X and the variable Y obey Gaussian distribution with the mean value of 0 and the variance of 1;
and finally, the amplitude-frequency control module (3-2-3) performs amplitude and frequency transformation on the generated variable X and variable Y meeting Gaussian distribution according to a control instruction output by the main control module (3-1) to obtain a Gaussian white noise waveform with controllable amplitude and frequency, and then the D/A conversion control module (3-2-4) converts the Gaussian white noise waveform into analog quantity to be output to the ripple superposition module (3-3), so that the generation of the Gaussian white noise ripple is completed.
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