CN216622497U - Direct current side voltage sampling device - Google Patents
Direct current side voltage sampling device Download PDFInfo
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- CN216622497U CN216622497U CN202122887826.2U CN202122887826U CN216622497U CN 216622497 U CN216622497 U CN 216622497U CN 202122887826 U CN202122887826 U CN 202122887826U CN 216622497 U CN216622497 U CN 216622497U
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Abstract
The utility model relates to a direct current side voltage sampling device. The utility model comprises the following steps: the voltage signal amplifying circuit is used for amplifying a voltage signal, the voltage bias circuit is used for boosting voltage, the filter circuit and the DSP chip; the voltage bias circuit comprises a voltage amplifier, a first resistor and a second resistor, the inverting phase of the voltage amplifier is respectively connected with the first resistor and the second resistor, the other end of the first resistor is connected with the output end of the voltage amplifier, and the positive phase of the voltage amplifier is connected with a reference voltage; the output end of the voltage signal amplifying circuit is connected with the voltage bias circuit, the output end of the voltage bias circuit is connected with the filter circuit, and the output end of the filter chip is connected with the DSP chip. The utility model can more accurately acquire the direct current voltage value by utilizing the voltage bias circuit under the condition of lower direct current voltage, and improves the accuracy of acquiring the voltage under the condition of lower direct current voltage.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a direct-current side voltage sampling device.
Background
Under the background of the current digital age, the DSP has become a basic device in the fields of communication, computers, consumer electronics, and the like, and is known as a leading cause of social revolution of information. However, the accuracy of collecting smaller direct current voltage signals by the DSP chip is not high, and the value is smaller after the voltage is divided by the resistor under the condition that the voltage at the direct current side is smaller, so that the collected value sent into the DSP chip is smaller, and the error range of the voltage value is larger.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the problem that the error range of the voltage value is larger because the acquisition value sent into the DSP chip is smaller under the condition that the voltage at the direct current side is smaller in the prior art.
In order to solve the technical problem, the utility model provides a voltage boosting device for sampling the voltage at the direct current side, which comprises a voltage signal amplifying circuit, a voltage bias circuit, a filter circuit and a DSP chip, wherein the voltage signal amplifying circuit is used for amplifying a voltage signal; the input end of the voltage signal amplifying circuit is connected with a voltage signal to be sampled, and the output end of the voltage signal amplifying circuit is connected with the voltage bias circuit; the output end of the voltage bias circuit is connected with the input end of the filter circuit; and the output end of the filter circuit is connected with the DSP chip.
In one embodiment of the utility model, the voltage bias circuit includes a voltage amplifier, a first resistor and a second resistor.
In one embodiment of the present invention, a positive phase of the voltage amplifier is connected to a reference voltage, an inverted phase of the voltage amplifier is connected to the first resistor and the second resistor, respectively, and the inverted phase of the voltage amplifier is connected to an output terminal of the voltage amplifier through the first resistor.
In one embodiment of the present invention, the voltage signal amplifying circuit includes: operational amplifier, third resistance, fourth resistance and fifth resistance.
In an embodiment of the present invention, the positive phase of the operational amplifier is connected to one end of the third resistor, the other end of the third resistor is grounded, the negative phases of the operational amplifier are respectively connected to the fourth resistor and the fifth resistor, and the fifth resistor is connected to the output end of the operational amplifier.
In one embodiment of the present invention, the filter circuit includes: a filter resistor and a capacitor.
In an embodiment of the present invention, one end of the filter resistor is connected to the output end of the bias circuit, the other end of the filter resistor is connected to the DSP chip, the negative electrode of the capacitor is connected to the filter resistor, and the positive electrode of the capacitor is grounded.
In one embodiment of the utility model, a switching diode for protecting the output voltage is connected between the voltage bias circuit and the filter circuit.
In one embodiment of the present invention, the model of the DSP chip is C2000.
In one embodiment of the utility model, the model of the DSP chip is TMS320F 2812.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
according to the direct-current side voltage sampling device, the input end of the voltage signal amplifying circuit is connected with a voltage signal to be sampled, the output end of the voltage signal amplifying circuit is connected with the input end of the bias circuit, the output end of the voltage bias circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the DSP chip; the voltage signal amplifying circuit amplifies the voltage of the voltage signal to be sampled, the voltage biasing circuit biases and lifts the voltage to be sampled, the filter circuit outputs stable and accurate voltage to be sampled, and the stable and accurate voltage to be sampled is input to the DPS chip.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a dc-side voltage sampling apparatus according to the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dc-side voltage sampling apparatus according to the present invention. The utility model relates to a DC side voltage sampling device, comprising: the voltage signal amplifying circuit is used for amplifying a voltage signal, the voltage bias circuit is used for boosting voltage, the filter circuit and the DSP chip.
The voltage signal amplifying circuit includes: the operational amplifier, a third resistor, a fourth resistor and a fifth resistor; the positive phase of the operational amplifier is connected with one end of the third resistor, the other end of the third resistor is grounded, the reverse phase of the operational amplifier is respectively connected with the fourth resistor and the fifth resistor, the other end of the fourth resistor is connected with a voltage signal to be acquired, and the other end of the fifth resistor is connected with the output end of the operational amplifier.
The voltage bias circuit includes: a voltage amplifier, a first resistor and a second resistor; as shown in fig. 1, a voltage dividing resistor in the circuit divides a voltage into a reference voltage, a positive phase of the voltage amplifier is connected with the reference voltage, an inverted phase of the voltage amplifier is respectively connected with the first resistor and the second resistor, the other end of the first resistor is connected with an output end of the voltage amplifier, the other end of the second resistor is connected with an output end of the voltage signal amplifying circuit, a positive phase capacity of the voltage amplifier is +15VA, and a negative phase capacity of the voltage amplifier is-15 VA.
The filter circuit includes: a filter resistor and a capacitor; one end of the filter resistor is connected with the output end of the bias circuit, the other end of the filter resistor is connected with the DSP chip, the negative electrode of the capacitor is connected with the filter resistor, and the positive electrode of the capacitor is grounded.
In the utility model, the model of the DSP chip may be C2000, and the model of the DSP chip may be TMS320F2812, etc.
The voltage signal amplifying circuit receives a voltage signal to be sampled through the reverse phase of the operational amplifier to carry out operational amplification processing, and amplifies the voltage signal to be sampled; the voltage bias circuit receives the voltage to be sampled of the amplified voltage signal through the reverse phase of the voltage amplifier and lifts the voltage value of the voltage to be sampled; the filter circuit carries out filtering processing on the voltage to be sampled after the voltage transmitted by the voltage bias circuit is lifted, so that the stability and accuracy of the output voltage are ensured, and the output voltage enters a DSP chip to be calculated to obtain a correct numerical value.
In this embodiment, a voltage signal to be sampled is amplified by a voltage signal amplifying circuit, a voltage value of the voltage to be sampled is raised by a voltage bias circuit, the voltage to be sampled is filtered by a filtering circuit, and an output voltage is calculated by a DSP chip to obtain a correct value.
In other embodiments of the present invention, a switching diode is connected between the voltage bias circuit and the filter circuit, the switching diode plays a role in protecting the output voltage in the circuit, the transmission of the voltage in the circuit can be controlled through the switching diode, and when the voltage in the circuit is abnormal, the switching diode can be turned off to protect the safety of each element in the circuit, so as to clamp the voltage value at 0-2.75V.
The direct-current side voltage sampling device provided by the embodiment of the utility model can be used for more accurately acquiring the direct-current voltage value under the condition of lower direct-current voltage, improving the voltage acquisition accuracy under the condition of lower direct-current voltage, and improving the voltage value entering a DSP chip, so that the calculated value is more accurate and the error is smaller.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. A dc-side voltage sampling apparatus, comprising:
the voltage signal amplifying circuit is used for amplifying a voltage signal, the voltage bias circuit is used for boosting voltage, the filter circuit and the DSP chip;
the input end of the voltage signal amplifying circuit is connected with a voltage signal to be sampled, and the output end of the voltage signal amplifying circuit is connected with the voltage bias circuit; the output end of the voltage bias circuit is connected with the input end of the filter circuit; and the output end of the filter circuit is connected with the DSP chip.
2. The apparatus of claim 1, wherein the voltage bias circuit comprises a voltage amplifier, a first resistor and a second resistor.
3. The apparatus of claim 2, wherein the non-inverting input of the voltage amplifier is connected to a reference voltage, the inverting input of the voltage amplifier is connected to the first resistor and the second resistor, respectively, and the inverting input of the voltage amplifier is connected to the output of the voltage amplifier through the first resistor.
4. The apparatus of claim 1, wherein the voltage signal amplification circuit comprises: operational amplifier, third resistance, fourth resistance and fifth resistance.
5. The apparatus of claim 4, wherein the positive phase of the operational amplifier is connected to one end of the third resistor, the other end of the third resistor is grounded, the negative phase of the operational amplifier is connected to the fourth resistor and the fifth resistor, respectively, and the fifth resistor is connected to the output terminal of the operational amplifier.
6. The apparatus of claim 1, wherein the filtering circuit comprises: a filter resistor and a capacitor.
7. The device of claim 6, wherein one end of the filter resistor is connected to the output end of the bias circuit, the other end of the filter resistor is connected to the DSP chip, the negative electrode of the capacitor is connected to the filter resistor, and the positive electrode of the capacitor is grounded.
8. The apparatus of claim 1, wherein a switching diode for protecting an output voltage is connected between the voltage bias circuit and the filter circuit.
9. The apparatus of claim 1, wherein the DSP chip is of type C2000.
10. The apparatus of claim 1, wherein the DSP chip is model TMS320F 2812.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122887826.2U CN216622497U (en) | 2021-11-18 | 2021-11-18 | Direct current side voltage sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122887826.2U CN216622497U (en) | 2021-11-18 | 2021-11-18 | Direct current side voltage sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216622497U true CN216622497U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122887826.2U Active CN216622497U (en) | 2021-11-18 | 2021-11-18 | Direct current side voltage sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216622497U (en) |
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2021
- 2021-11-18 CN CN202122887826.2U patent/CN216622497U/en active Active
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