CN217133264U - High-voltage negative voltage detection circuit based on operational amplifier - Google Patents
High-voltage negative voltage detection circuit based on operational amplifier Download PDFInfo
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- CN217133264U CN217133264U CN202220909012.6U CN202220909012U CN217133264U CN 217133264 U CN217133264 U CN 217133264U CN 202220909012 U CN202220909012 U CN 202220909012U CN 217133264 U CN217133264 U CN 217133264U
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Abstract
The utility model discloses a high pressure negative pressure detection circuitry based on operational amplifier, including power supply circuit, power supply circuit is used for producing the constant current source. And the conversion circuit is used for converting the current signal generated by the constant current source of the power supply circuit into a voltage signal. And the amplifying circuit comprises a detection resistor and is used for amplifying the voltage detected by the detection resistor. And the acquisition circuit is used for acquiring the current signal amplified by the amplifying circuit. The utility model discloses a conversion circuit converts the load into the malleation with the negative pressure of electrical apparatus after, through the malleation after operational amplifier output conversion, converts the malleation after will enlargiing into the electric current again, through the electric current after digital microprocessor discerns the enlargies, alright in order to survey the load with the negative pressure of electrical apparatus through ohm's law, accomplished isolation current's detection for laying of circuit has more selections, and isolation current detects's precision also has the improvement.
Description
Technical Field
The utility model relates to a power equipment technical field, concretely relates to high-pressure negative pressure detection circuitry based on operational amplifier.
Background
In a conventional high-voltage negative-pressure current detection link, a Hall current sensor is usually adopted, and isolation current detection is realized through electromagnetic induction. However, the hall sensor used in the conventional scheme has a large volume, and is difficult to place in a partial circuit environment, and the hall current sensing technology product on the market at present has low precision and large temperature drift, and the conventional device has poor consistency, and cannot obtain the expected negative pressure current detection effect in actual use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-pressure negative pressure detection circuitry based on operational amplifier, after converting the load with the negative pressure conversion of electrical apparatus to the malleation through converting circuit, malleation after the operational amplifier output conversion, the malleation after will enlargiing again converts the electric current into, through the electric current after digital microprocessor discernment is enlargied, alright with the negative pressure of electrical apparatus for the load is surveyed through ohm's law, the detection of isolation current has been accomplished, make laying of circuit have more selections, the precision that isolation current detected also has the improvement.
The utility model discloses a following technical scheme realizes:
a kind of high-pressure negative pressure detection circuit based on operational amplifier, including:
the power supply circuit is used for generating a constant current source;
the conversion circuit is used for converting a current signal generated by the constant current source of the power supply circuit into a voltage signal;
the amplifying circuit comprises a collecting resistor, a first resistor, a second resistor, a third resistor and an operational amplifier, wherein the collecting resistor is electrically connected with the operational amplifier, and one end of the collecting resistor is connected to the reverse input end of the operational amplifier; the homodromous input end of the operational amplifier is connected with the third resistor;
and the acquisition circuit is used for acquiring the current signal amplified by the amplifying circuit.
Furthermore, the power supply circuit comprises a fourth resistor, a fifth resistor, a first triode and a second triode, the fourth resistor is connected with the fifth resistor in parallel, and the fourth resistor and the fifth resistor are connected with the second triode through the first triode to form a channel.
Furthermore, the conversion circuit comprises a voltage stabilizing diode and a first capacitor, and the first capacitor is connected with the voltage stabilizing diode in parallel; the acquisition circuit comprises a digital microprocessor and a first power supply, and the first power supply is used for supplying power to the digital microprocessor.
Furthermore, one end of a fourth resistor is connected with one end of the first power supply, and a fifth resistor is connected with the voltage stabilizing diode and the first capacitor in parallel.
Furthermore, the anode of the voltage stabilizing diode is connected with the first triode, and the cathode of the voltage stabilizing diode is connected with the fifth resistor; one end of the first capacitor is connected with one end of the second triode, and the other end of the first capacitor is connected with the fifth resistor.
Furthermore, the device also comprises a load electric appliance which is connected with the acquisition resistor in series, and the operational amplifier is used for amplifying the voltage of the acquisition resistor.
The second conversion circuit comprises a sixth resistor and a third triode, one end of the third triode is connected with the operational amplifier, and the other end of the third triode is connected with the sixth resistor; the sixth resistor is connected with the acquisition resistor, and the second conversion circuit is used for converting the voltage amplified by the operational amplifier into a current signal.
Furthermore, the acquisition circuit also comprises a seventh resistor, one end of the seventh resistor is connected with the first power supply, and the other end of the seventh resistor is connected with the digital microprocessor.
Furthermore, the device also comprises a second power supply, wherein the anode of the second power supply is connected with the cathode of the first power supply, and the cathode of the second power supply is connected with the sixth resistor.
Furthermore, the digital microprocessor also comprises an A/D converter, and the digital microprocessor is matched with the A/D converter and used for acquiring the voltage of the seventh resistor.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses a two converting circuit and an amplifier circuit can accomplish and keep apart the detection to the electric current of load with electrical apparatus, compare in using hall current sensor, can reduce the temperature drift and greatly reach the relatively poor problem of conventional device uniformity, have improved isolation current detection's stability and accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is the utility model provides a pair of high-pressure negative current detection circuit schematic diagram based on operational amplifier.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, a high-voltage negative-voltage detection circuit based on an operational amplifier OPA1 is characterized by including a power supply circuit, wherein the power supply circuit is used for generating a constant current source, and includes a resistor R6, a resistor R7, a transistor Q2, and a transistor Q3, the transistor may be a transistor or an MOS transistor, and the specific type and type of the transistor are not limited in this embodiment and can be selected according to actual assembly requirements. The resistor R6 and the resistor R7 are connected with the transistor Q2 through the transistor Q2 to form a path. The conversion circuit is used for converting a current signal generated by the constant current source of the power supply circuit into a voltage signal and comprises a voltage stabilizing diode ZD1 and a capacitor C1, and the capacitor C1 is connected with the voltage stabilizing diode ZD1 in parallel. The amplifying circuit comprises a detection resistor, is used for amplifying the voltage detected by the detection resistor, and comprises an R-presence resistor, a resistor R3, a resistor R4, a resistor R5 and an operational amplifier OPA1, wherein the R-presence resistor and the operational amplifier OPA1 form a passage through a resistor R3, and one end of the operational amplifier OPA1 is connected with the fifth amplifier in series. In the embodiment, the collecting resistor is an R-sense current detection resistor. The acquisition circuit is used for acquiring the current signals amplified by the amplifying circuit and comprises a digital microprocessor and a power supply V1, and the power supply V1 is used for supplying power to the digital microprocessor. This embodiment converts the load into after the malleation through converting circuit with load electrical apparatus's negative pressure, positive pressure after the conversion is exported through operational amplifier OPA1, positive pressure after will enlargiing again converts the electric current into, electric current after discerning the amplification through digital microprocessor, alright with the negative pressure of load electrical apparatus is surveyed through ohm's law, the detection of isolation current has both been accomplished, also replace hall current sensor through the circuit, make laying of circuit have more selections, isolation current detection's precision also has the improvement.
The positive electrode of the operational amplifier OPA1 is connected with one end of a triode Q2, one end of a resistor R6 is connected with one end of a power supply V1, and a resistor R7 is connected with a zener diode ZD1 and a capacitor C1 in parallel. The anode of the zener diode ZD1 is connected with the triode Q3, and the cathode of the zener diode ZD1 is connected with the operational amplifier OPA 1; one end of the capacitor C1 is connected to one end of the capacitor C1, and the other end is connected to the operational amplifier OPA 1. Due to the application of a specific circuit, the power supply device further comprises a load electrical appliance and power supply V2, wherein the anode of the power supply V2 is connected with the cathode of the first power supply V1, and the cathode of the power supply V2 is connected with the resistor R2. Power supply V2 is used to power the load appliances. The load electrical equipment is connected with the R-presence resistor in series, and the operational amplifier OPA1 is used for amplifying the voltage of the R-presence resistor.
After the voltage amplification of the load electric appliance is finished, the power supply further comprises a second conversion circuit, the second conversion circuit comprises a resistor R2 and a triode Q1, one end of the triode Q1 is connected with an operational amplifier OPA1, and the other end of the triode Q1 is connected with a resistor R2; the resistor R2 is connected with the R-sensor resistor, and the second conversion circuit is used for converting the voltage amplified by the operational amplifier OPA1 into a current signal. Specifically, the acquisition circuit further comprises a resistor R1, one end of the resistor R1 is connected with the power supply V1, and the other end is connected with the digital microprocessor. The digital microprocessor adopts an MCU singlechip, an A/D converter is arranged in the MCU singlechip, and the digital microprocessor is matched with the A/D converter to acquire the voltage of a resistor R1.
Through the design, the operational amplifier OPA1, the resistor R3, the resistor R4 and the resistor R5 form a conventional operational amplifier in-phase amplifier, a weak voltage signal measured by the R-sense resistor is amplified, the amplified voltage value output by the operational amplifier is in direct proportion to the voltage at two ends of the R-sense resistor, the voltage is converted into a current signal through the triode Q1 and the resistor R2, the magnitude of the current signal is in direct proportion to the voltage at two ends of the R-sense resistor, the current returns to the negative electrode of the power supply V1 from the positive electrode of the power supply V1 through the resistor R1, the triode Q1, the resistor R2 and the power supply V2, and therefore, the current flowing through the resistor R1 is in direct proportion to the voltage at two ends of the R-sense resistor. As can be seen from ohm's law I ═ V/R, the voltage across resistor R1 is proportional to the current, and therefore the voltage across resistor R1 is proportional to the voltage across the R-sense resistor.
The voltage at two ends of the resistor R1 is collected through an A/D converter arranged in the MCU, and the current flowing through the current detection resistor R-sense can be measured.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high-voltage negative voltage detection circuit based on an operational amplifier is characterized by comprising:
a power supply circuit for generating a constant current source;
the conversion circuit is used for converting a current signal generated by the constant current source of the power supply circuit into a voltage signal;
the amplifying circuit comprises a collecting resistor, a first resistor, a second resistor, a third resistor and an operational amplifier, wherein the collecting resistor is electrically connected with the operational amplifier, and one end of the collecting resistor is connected to the reverse input end of the operational amplifier; the same-direction input end of the operational amplifier is connected with the third resistor;
and the acquisition circuit is used for acquiring the current signal amplified by the amplifying circuit.
2. The operational amplifier-based high-voltage negative-voltage detection circuit as claimed in claim 1, wherein the power supply circuit comprises a fourth resistor, a fifth resistor, a first transistor and a second transistor, the fourth resistor is connected in parallel with the fifth resistor, and the fourth resistor and the fifth resistor are connected to form a circuit through the first transistor and the second transistor.
3. The operational amplifier based high voltage negative voltage detection circuit according to claim 2, wherein the conversion circuit comprises a zener diode and a first capacitor, and the first capacitor is connected in parallel with the zener diode; the acquisition circuit comprises a digital microprocessor and a first power supply, wherein the first power supply is used for supplying power to the digital microprocessor.
4. The operational amplifier-based high-voltage negative-voltage detection circuit as claimed in claim 3, wherein one end of the fourth resistor is connected to one end of the first power supply, and the fifth resistor is connected in parallel with the zener diode and the first capacitor.
5. The operational amplifier based high voltage negative voltage detection circuit according to claim 4, wherein the anode of the zener diode is connected to the first transistor, and the cathode of the zener diode is connected to the fifth resistor; one end of the first capacitor is connected with one end of the second triode, and the other end of the first capacitor is connected with the fifth resistor.
6. The operational amplifier-based high-voltage negative-voltage detection circuit as claimed in claim 5, further comprising a load electrical appliance, wherein the load electrical appliance is connected in series with the collection resistor, and the operational amplifier is configured to amplify the voltage of the collection resistor.
7. The operational amplifier-based high-voltage negative-voltage detection circuit according to claim 6, further comprising a second switching circuit, wherein the second switching circuit comprises a sixth resistor and a third transistor, one end of the third transistor is connected to the operational amplifier, and the other end of the third transistor is connected to the sixth resistor; the sixth resistor is connected with the acquisition resistor, and the second conversion circuit is used for converting the voltage amplified by the operational amplifier into a current signal.
8. The operational amplifier based high voltage negative voltage detection circuit as claimed in claim 7, wherein said acquisition circuit further comprises a seventh resistor, one end of said seventh resistor is connected to said first power supply, and the other end is connected to said digital microprocessor.
9. The operational amplifier based high voltage negative voltage detection circuit according to claim 8, further comprising a second power supply, wherein a positive electrode of the second power supply is connected to a negative electrode of the first power supply, and a negative electrode of the second power supply is connected to the sixth resistor.
10. The operational amplifier based high voltage negative voltage detection circuit as claimed in claim 9, wherein said digital microprocessor further comprises an a/D converter, said digital microprocessor cooperating with said a/D converter for collecting the voltage of said seventh resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220909012.6U CN217133264U (en) | 2022-04-19 | 2022-04-19 | High-voltage negative voltage detection circuit based on operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220909012.6U CN217133264U (en) | 2022-04-19 | 2022-04-19 | High-voltage negative voltage detection circuit based on operational amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN217133264U true CN217133264U (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220909012.6U Active CN217133264U (en) | 2022-04-19 | 2022-04-19 | High-voltage negative voltage detection circuit based on operational amplifier |
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| CN (1) | CN217133264U (en) |
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