CN213275733U - Hall sensor current monitoring circuit - Google Patents
Hall sensor current monitoring circuit Download PDFInfo
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- CN213275733U CN213275733U CN202021357132.7U CN202021357132U CN213275733U CN 213275733 U CN213275733 U CN 213275733U CN 202021357132 U CN202021357132 U CN 202021357132U CN 213275733 U CN213275733 U CN 213275733U
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- hall sensor
- amplifying circuit
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- subtraction amplifying
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Abstract
The utility model discloses a Hall sensor current monitoring circuit, which comprises a Hall sensor U1, a subtraction amplifying circuit and a signal output end Vo; the pin Vout of the Hall sensor U1 is connected with the non-inverting input end of the subtraction amplifying circuit, the pin Vref of the Hall sensor U1 is connected with the inverting input end of the subtraction amplifying circuit, and the output end of the subtraction amplifying circuit is connected with the signal output end Vo. The utility model discloses an interference killing feature is strong.
Description
Technical Field
The utility model relates to a cubical switchboard field especially indicates a hall sensor current monitoring circuit.
Background
At present, in a high-voltage switch cabinet, current monitoring can be carried out through a Hall sensor U1 ', and currents of a closing coil and an energy storage motor are respectively monitored in the high-voltage switch cabinet through different Hall sensors U1'; as shown in fig. 1, in the conventional hall sensor current monitoring circuit, since the power supply voltage of the hall sensor U1 'is generally 5V, and the power supply voltage of the rear-end processor is generally 3.3V, the pin Vout of the hall sensor U1' is connected to the signal output terminal Vo 'of the hall sensor current monitoring circuit through a voltage dividing circuit formed by a resistor R1' and a resistor R2 ', and the signal output terminal Vo' is used for connecting to the rear-end processor; however, the current monitoring circuit of the existing Hall sensor has some problems:
1. if the output signal voltage of the pin Vout of the hall sensor U1 ' is too high due to the failure of the hall sensor U1 ', the voltage input from the signal output terminal Vo ' to the back-end processor is too high, which easily causes the back-end processor to be damaged;
2. the existing Hall sensor current monitoring circuit has poor anti-interference performance, an output signal of a Vout pin of a Hall sensor U1 'contains interference components caused by environmental factors, and the interference components are input into a rear-end processor through a signal output end Vo', so that the accuracy of current monitoring is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hall sensor current monitoring circuit, its interference killing feature is strong.
In order to achieve the above purpose, the solution of the present invention is:
a Hall sensor current monitoring circuit comprises a Hall sensor U1, a subtraction amplifying circuit and a signal output end Vo; the VCC pin of the Hall sensor U1 is connected with a power supply VDD, the GND pin of the Hall sensor U1 is grounded, the Vout pin of the Hall sensor U1 is connected with the non-inverting input end of the subtraction amplifying circuit, the Vref pin of the Hall sensor U1 is connected with the inverting input end of the subtraction amplifying circuit, and the output end of the subtraction amplifying circuit is connected with the signal output end Vo.
The subtraction amplifying circuit comprises an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4; the first end of the resistor R1 is used as the non-inverting input terminal of the subtraction amplifying circuit, the second end of the resistor R1 is connected to the first end of the resistor R2 and the non-inverting input terminal of the operational amplifier U2, the second end of the resistor R2 is grounded, the first end of the resistor R3 is used as the inverting input terminal of the subtraction amplifying circuit, the second end of the resistor R3 is connected to the inverting input terminal of the operational amplifier U2 and the first end of the resistor R4, the second end of the resistor R4 is connected to the output terminal of the operational amplifier U2 and is used as the output terminal of the subtraction amplifying circuit, the power supply terminal of the operational amplifier U2 is connected to the power supply VDD, and the ground terminal.
The Hall sensor current monitoring circuit further comprises a voltage reduction filter circuit; and the output end of the subtraction amplifying circuit is connected with the signal output end Vo through the voltage reduction filtering circuit.
The buck filter circuit comprises a resistor R5, a resistor R6 and a capacitor C1, wherein a first end of the resistor R6 is connected with a first end of a resistor R5 and serves as an input end of the buck filter circuit, a second end of a resistor R6 is connected with a first end of a capacitor C1 and serves as an output end of the buck filter circuit, and a second end of the resistor R5 and a second end of the capacitor C1 are grounded; and the input end and the output end of the voltage reduction filter circuit are respectively connected with the output end of the subtraction amplifying circuit and the signal output end Vo.
After the scheme is adopted, the utility model discloses a signal Vo = (Vout-Vref). A of the signal subtraction amplifying circuit output of subtraction amplifying circuit output; wherein Vout is Hall sensor U1's Vout foot output signal's voltage value, Vref is the Vref foot output signal's of Hall sensor U1 voltage value, and A is subtraction amplifying circuit's magnification, and because contain in Hall sensor U1's Vout foot and Vref foot respective output signal because the interference component that the environmental factor caused is the same, like this the utility model discloses a subtraction amplifying circuit just can filter the interference component because the environmental factor caused to the interference killing feature of circuit has been improved, has guaranteed current monitoring's accuracy.
Drawings
FIG. 1 is a schematic circuit diagram of a current monitoring circuit of a conventional Hall sensor;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
As shown in fig. 2, the utility model discloses a hall sensor current monitoring circuit, which comprises a hall sensor U1, a subtraction amplifying circuit and a signal output terminal Vo; the VCC pin of the Hall sensor U1 is connected with a power supply VDD, the voltage of the power supply VDD can be 5V, the GND pin of the Hall sensor U1 is grounded, the Vout pin of the Hall sensor U1 is connected with the non-inverting input end of the subtraction amplifying circuit, the Vref pin of the Hall sensor U1 is connected with the inverting input end of the subtraction amplifying circuit, the output end of the subtraction amplifying circuit is connected with a signal output end Vo, and the model of the Hall sensor U1 can be TBC10HXS5 or TBC10ES 5. Because the output signals of the Vout pin and the Vref pin of the Hall sensor U1 contain the same interference component caused by environmental factors, the signal Vo = (Vout-Vref) × A output by the output end of the subtraction amplifying circuit; wherein Vout is Hall sensor U1's Vout foot output signal's voltage value, and Vref is for being Hall sensor U1's Vref foot output signal's voltage value, and A is subtraction amplifying circuit's magnification, consequently the utility model discloses a subtraction amplifying circuit just can filter because the interference component that environmental factor caused to the interference killing feature of circuit has been improved, current monitoring's accuracy has been guaranteed.
As shown in fig. 2, the subtracting and amplifying circuit includes an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, and a resistor R4; the first end of the resistor R1 is used as the non-inverting input end of the subtraction amplifying circuit, the second end of the resistor R1 is connected with the first end of the resistor R2 and the non-inverting input end of the operational amplifier U2, the second end of the resistor R2 is grounded, the first end of the resistor R3 is used as the inverting input end of the subtraction amplifying circuit, the second end of the resistor R3 is connected with the inverting input end of the operational amplifier U2 and the first end of the resistor R4, the second end of the resistor R4 is connected with the output end of the operational amplifier U2 and is used as the output end of the subtraction amplifying circuit, the power supply end of the operational amplifier U2 is connected with the power supply VDD, and the ground end; the resistance of the resistor R1 may be equal to the resistance of the resistor R2, the resistance of the resistor R3 may be equal to the resistance of the resistor R4, and the amplification factor a of the subtracting and amplifying circuit is equal to the resistance of the resistor R4 divided by the resistance of the resistor R1.
As shown in fig. 2, the present invention may further include a voltage-reducing filter circuit; the output end of the subtraction amplifying circuit is connected with the signal output end Vo through the voltage reduction filtering circuit, and the voltage reduction filtering circuit can reduce the voltage and filter the signal output by the output end of the subtraction amplifying circuit and then output the signal to the signal output end Vo, so that the overhigh output voltage of the signal output end Vo is avoided; in addition, the power supply end of the operational amplifier U2 of the subtraction amplifying circuit is connected with the power supply VDD, so that the voltage of the signal output by the output end of the subtraction amplifying circuit does not exceed the voltage of the power supply VDD, the output voltage of the signal output end Vo can be prevented from being too high, and the damage to a rear-end processor connected with the signal output end Vo due to the fact that the output voltage of the signal output end Vo is too high is prevented.
As shown in fig. 2, the buck filter circuit includes a resistor R5, a resistor R6, and a capacitor C1, wherein a first terminal of the resistor R6 is connected to a first terminal of the resistor R5 and serves as an input terminal of the buck filter circuit, a second terminal of the resistor R6 is connected to a first terminal of the capacitor C1 and serves as an output terminal of the buck filter circuit, and a second terminal of the resistor R5 and a second terminal of the capacitor C1 are grounded; and the input end and the output end of the voltage reduction filter circuit are respectively connected with the output end of the subtraction amplifying circuit and the signal output end Vo.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.
Claims (4)
1. A Hall sensor current monitoring circuit which characterized in that: the Hall sensor U1, a subtraction amplifying circuit and a signal output end Vo are included;
the VCC pin of the Hall sensor U1 is connected with a power supply VDD, the GND pin of the Hall sensor U1 is grounded, the Vout pin of the Hall sensor U1 is connected with the non-inverting input end of the subtraction amplifying circuit, the Vref pin of the Hall sensor U1 is connected with the inverting input end of the subtraction amplifying circuit, and the output end of the subtraction amplifying circuit is connected with the signal output end Vo.
2. The hall sensor current monitoring circuit of claim 1 wherein: the subtraction amplifying circuit comprises an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;
the first end of the resistor R1 is used as the non-inverting input terminal of the subtraction amplifying circuit, the second end of the resistor R1 is connected to the first end of the resistor R2 and the non-inverting input terminal of the operational amplifier U2, the second end of the resistor R2 is grounded, the first end of the resistor R3 is used as the inverting input terminal of the subtraction amplifying circuit, the second end of the resistor R3 is connected to the inverting input terminal of the operational amplifier U2 and the first end of the resistor R4, the second end of the resistor R4 is connected to the output terminal of the operational amplifier U2 and is used as the output terminal of the subtraction amplifying circuit, the power supply terminal of the operational amplifier U2 is connected to the power supply VDD, and the ground terminal.
3. The hall sensor current monitoring circuit of claim 1 or 2 wherein: the voltage reduction filter circuit is also included; and the output end of the subtraction amplifying circuit is connected with the signal output end Vo through the voltage reduction filtering circuit.
4. The hall sensor current monitoring circuit of claim 3 wherein: the buck filter circuit comprises a resistor R5, a resistor R6 and a capacitor C1, wherein a first end of the resistor R6 is connected with a first end of a resistor R5 and serves as an input end of the buck filter circuit, a second end of a resistor R6 is connected with a first end of a capacitor C1 and serves as an output end of the buck filter circuit, and a second end of the resistor R5 and a second end of the capacitor C1 are grounded;
and the input end and the output end of the voltage reduction filter circuit are respectively connected with the output end of the subtraction amplifying circuit and the signal output end Vo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021357132.7U CN213275733U (en) | 2020-07-10 | 2020-07-10 | Hall sensor current monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021357132.7U CN213275733U (en) | 2020-07-10 | 2020-07-10 | Hall sensor current monitoring circuit |
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| CN213275733U true CN213275733U (en) | 2021-05-25 |
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| CN202021357132.7U Active CN213275733U (en) | 2020-07-10 | 2020-07-10 | Hall sensor current monitoring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305404A (en) * | 2021-12-28 | 2022-04-12 | 乐普（北京）医疗器械股份有限公司 | Radiant heat collecting and amplifying circuit and application thereof |
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2020
- 2020-07-10 CN CN202021357132.7U patent/CN213275733U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305404A (en) * | 2021-12-28 | 2022-04-12 | 乐普（北京）医疗器械股份有限公司 | Radiant heat collecting and amplifying circuit and application thereof |
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